• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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  • 优先权
    • 专利摘要:
    An intrinsic power system for auxiliary services of power converters is disclosed, comprising a sinusoidal filter (12) connected between an auxiliary output of a DC/AC inverter module (9, 9a, 9n) and an auxiliary transformer input (5) in such a way that a control module (8), by means of control commands, interrupts the main output of the DC/AC inverter module (9, 9a, 9n) and enables the secondary output thereof for the auxiliary transformer (5) generate AC auxiliary power. The inverter module DC/AC (9, 9a, 9n) is connectable to a DC source (4) and pours the power generated by it to an AC network (4). (Machine-translation by Google Translate, not legally binding)
    公开号:ES2695630A1
    申请号:ES201730880
    申请日:2017-07-03
    公开日:2019-01-09
    发明作者:Lerma Antonio Poveda；Laorden Santiago Garcia；Parra Miguel Angel Gargallo；Gimenez David Dobon；Lillo Abelardo Salvo；Lillo David Salvo
    申请人:Power Electronics Espana SL；
    IPC主号:
    专利说明:

    [0001] INTRINSIC POWER SUPPLY SYSTEM FOR AUXILIARY SERVICES
    [0002]
    [0003] FIELD OF THE INVENTION
    [0004] The present invention relates to an intrinsic power system for auxiliary services of power converters.
    [0005] The technical field of the invention is framed within the field of converters, generators, transformers, and any other type of power system where there is a DC voltage / DC source and a transformer element of voltage / direct current to AC ( DC / AC).
    [0006]
    [0007] BACKGROUND OF THE INVENTION
    [0008] The majority of electrical equipment in general and the equipment of power converters in particular, which are connected to the AC network, need auxiliary power equipment to continue working in the event of failure of the AC network to which they are connected.
    [0009] Auxiliary power equipment is known as UPS. A UPS (Uninterrupted Power System) is a device made up of a set of batteries and a control unit, which can provide electrical power for a limited period of time to all the components or devices connected to it.
    [0010] Within the technical field of power converters, a UPS is used to provide a power supply that allows to maintain certain functionalities configured by the user in situations of failure or disconnection of the network. The functionalities that are connected to the UPS are those that are considered to continue operating despite these eventual disconnections (protections, monitoring devices, trackers or solar trackers in case the power converter is a solar inverter, etc.). ).
    [0011] The UPSs used in the power converters are large and heavy equipment that in addition to needing a large surface for installation, require a large energy consumption because they need to be cooled. In other words, current UPS systems are expensive, complex and of large dimensions.
    [0012] Therefore, it would be desirable to be able to power the power converters in the event of a network failure by eliminating the drawbacks described above and associated with the UPSs.
    [0013] DESCRIPTION OF THE INVENTION
    [0014]
    [0015] The present invention applies to a power converter with DC / AC voltage / current conversion stage and with access to a DC voltage / current source. An example of this type of power converters are solar photovoltaic inverters.
    [0016] Therefore, in a first aspect of the invention, an intrinsic power system for auxiliary services of power converters is disclosed. The intrinsic power system for auxiliary services of power converters comprises a sine-wave filter connected between an auxiliary output of a DC / AC inverter module and an auxiliary transformer input in such a way that a control module, by means of control slogans, interrupts the main output of the DC / AC inverter module and enables the secondary output of the module so that the auxiliary transformer generates the auxiliary AC supply. The inverter module DC / AC is connectable to a DC source and pours the power generated by it to an AC network. The control module additionally controls the voltage / current that the DC / AC inverter module must generate by means of control slogans to feed the auxiliary transformer.
    [0017] A particular realization of the invention would be the solar photovoltaic inverters. For these devices the DC power source would correspond to the photovoltaic field, while the DC / AC power conversion would be intrinsic to the equipment itself. In case the solar inverter is modular, the conversion stage could be constituted by a single inverter module, or by more than one depending on the power required by the auxiliary services.
    [0018] In one aspect of the invention, an intrinsic power system for auxiliary services of power converters is disclosed, comprising:
    [0019] • an auxiliary transformer comprising at least: two inputs and an auxiliary AC power output;
    [0020] • at least two contactors;
    [0021] • a sinusoidal filter whose output is connected to an input of the auxiliary transformer with interposition of a contactor;
    [0022] • at least one DC / AC inverter module comprising one input and two outputs; where the input is connectable to a DC source, one output is connected to the input of the sine-wave filter and the other output is connected to a AC line AC which in turn is connected to the auxiliary transformer with interposition of a contactor and connectable to an AC network;
    [0023] • a connection / disconnection contactor to the AC network located in the common line AC, between the output of the DC / AC inverter module and the AC network (10);
    [0024] • a control module configured for the sending of control commands and connected to at least:
    [0025] or the connection / disconnection contactor to the AC network;
    [0026] or the contactors;
    [0027] or the DC / AC inverter module;
    [0028] in such a way that the control module, by means of control setpoints, opens the connection / disconnection contactor to the AC network, opens the output contactor of the DC / AC inverter module, closes the output contactor of the AC sine-wave filter and adjusts the voltage and current at the output of the DC / AC inverter module that connects with the sine-wave filter so that the auxiliary transformer generates the AC auxiliary supply.
    [0029] In an embodiment of the first aspect of the invention, the intrinsic power system for power converter auxiliary services additionally comprises at least one DC / AC inverter module with a single output connected to the AC line.
    [0030] In an embodiment of the first aspect of the invention, the intrinsic power system for auxiliary services of power converters comprises at least two DC / AC inverter modules connected by means of respective contactors to the sine-wave filter, in such a way that the control module is configured to select from among the at least two DC / AC inverter modules at least one DC / AC inverter module to which the control instructions are sent and where the contactor associated with the selected DC / AC inverter module receives a closing command.
    [0031] In an embodiment of the first aspect of the invention, the intrinsic power system for auxiliary services of power converters, the DC / AC inverter module comprises a control stage and a power stage, wherein the power stage comprises at least : some fuses, a DC bus, a switching electronics, a contactor for connection / disconnection to the AC bus and a power filter. The sinusoidal filter is connected between the switching electronics and the AC connection / disconnection contactor.
    [0032] In an embodiment of the first aspect of the invention, the intrinsic power system for auxiliary services of power converters, the The control module comprises a form of power selected from: the DC source, a set of batteries and the auxiliary AC supply.
    [0033] In a form of realization of the first aspect of the invention, the sine filter comprises at least two coils in series per phase monofasica and at least one capacitor connected in parallel between each two phases monofasicas, so that the frequency of modulation Pulse-Width Modulation "PWM" of the output voltage of the DC / AC inverter module is converted to a 50/60 Hz frequency of the AC network.
    [0034] In a second aspect of the invention, there is disclosed a power converter comprising an intrinsic power system for auxiliary services according to any embodiment of the first aspect of the invention.
    [0035] In a third aspect of the invention, a solar inverter is disclosed which comprises an intrinsic power system for auxiliary services according to any embodiment of the first aspect of the invention.
    [0036] In a third aspect of the invention, a modular solar inverter comprising an intrinsic power system for auxiliary services according to any embodiment of the first aspect of the invention is disclosed.
    [0037]
    [0038] BRIEF DESCRIPTION OF THE FIGURES
    [0039] Figure 1.- Power converter according to the state of the art.
    [0040] Figure 2.- Photovoltaic solar inverter according to the state of the art.
    [0041] Figure 3.- Modular photovoltaic solar inverter according to the state of the art.
    [0042] Figure 4.- Main components of an inverter module.
    [0043] Figure 5.- Shows the inverter module and its main components: the control stage and the power stage.
    [0044] Figure 6.- Intrinsic power system for auxiliary services applied to power converters according to the present invention.
    [0045] Figure 7.- Shows the intrinsic power system for auxiliary services of power converters according to the present invention applied to a photovoltaic solar inverter as shown in figure 2.
    [0046] Figure 8.- Shows the intrinsic power system for auxiliary services of power converters according to the present invention applied to a modular solar photovoltaic inverter as shown in figure 3
    [0047] Figure 9.- Shows the intrinsic power system for auxiliary services of power converters according to the present invention applied to a modular solar photovoltaic inverter as shown in figure 3.
    [0048] Figure 10.- Shows the electrical connection of the sine-wave filter to the DC / AC inverter module.
    [0049] Figure 11.- Shows an example of realization of the sine-wave filter.
    [0050]
    [0051] PREFERRED EMBODIMENT OF THE INVENTION
    [0052] The references used in the figures are listed below.
    [0053] 1. Power converter
    [0054] 2. Photovoltaic solar inverter
    [0055] 3. Modular photovoltaic solar inverter
    [0056] 4. DC source.
    [0057] 5. Auxiliary transformer.
    [0058] 6. UPS.
    [0059] 7. Contactor of connection / disconnection to the AC network.
    [0060] 8. Control module.
    [0061] 9. DC / AC inverter module; 9a to 9n - Investor modules.
    [0062] 10. AC network.
    [0063] 11. AC / AC converter.
    [0064] 12. Sinusoidal filter.
    [0065] 13. 13a-13n contactors (output of the inverter modules 9a - 9n).
    [0066] 14. Medium Tension Transformer.
    [0067] 15. AC auxiliary power supply.
    [0068] 16. Auxiliary user power.
    [0069] 17. Common line AC of the inverter modules 9a to 9n.
    [0070] 18. DC bus
    [0071] 19. Power stage of the inverter module.
    [0072] 20. Control stage of the inverter module.
    [0073] 21. Contactor (from an auxiliary transformer input 5).
    [0074] 22. Contactor (from another input of the auxiliary transformer 5).
    [0075] 23. Power filter (included in the inverter module 9.9a-9n).
    [0076] 24. Contactor of connection / disconnection to the AC bus.
    [0077] 25. Fuses.
    [0078] 26. Switching electronics.
    [0079] 27. Coils (of the sine-wave filter 12).
    [0080] 28. Coils (of the sine-wave filter 12).
    [0081] 29. Coils (of the sine-wave filter 12)
    [0082] 30. Capacitors (of the sine-wave filter 12)
    [0083] 31. Battery.
    [0084]
    [0085] Before detailing the embodiment of the invention, figures 1, 2 and 3 show functional diagrams of a power converter, a photovoltaic solar inverter and a modular solar photovoltaic inverter according to the state of the art, respectively .
    [0086] The power converter 1 shown in FIG. 1 comprises the inverter module DC / AC 9 whose input is electrically connected to the DC source 4 and whose output is electrically connected to the AC / AC converter 11. The AC / AC converter 11 converts the voltage AC output of the inverter module DC / AC 9 in the AC network voltage, that is, it works as an AC / AC transformer in both module and frequency. The electrical output of the AC / AC converter 11 is connected to the AC 10 network by means of a connection / disconnection contactor 7. The electrical output of the AC / AC converter 11 is also connected to the UPS (Uninterrupted Power Supply System) 6 for recharging the same and power supply of the auxiliary transformer 5 for which the output of the UPS 6 is connected electrically with the input of the auxiliary transformer 5. The auxiliary transformer 5 has two power outputs, one is the auxiliary power supply AC 15 and the other is the user auxiliary supply 16. The auxiliary supply AC 15 has as function to feed the components of the power converter 1 for its normal operation. In figure 1, for simplicity, it is observed that the auxiliary supply AC 15 is connected to the AC / AC converter 11 and to the control module 8, but it can feed more components of the power converter 1. The control module 8 is connected via data link, with the AC / AC converter 11, with the inverter module DC / AC 9 and with the connection / disconnection contactor 7 to which it sends control instructions. The control instructions are instructions such as stop, start, magnitude of the output voltage, magnitude of the output current, opening, closing, etc. The arrows indicate the direction of the current in the electrical connections.
    [0087] The solar photovoltaic inverter 2, as shown in figure 2, has a structure similar to the power converter 1 since it is a particularization of the latter. The solar photovoltaic inverter 2 comprises the inverter module DC / AC 9 whose input is electrically connected to the DC source 4. The output of the inverter module DC / AC 9 is electrically connected to the AC network 10 through the on / off contactor 7. Optionally, the AC / AC transformer can be medium voltage 14 between the output of the connection / disconnection contactor 7 and the AC network 10. The medium voltage AC / AC transformer 14 converts the AC output voltage of the inverter module DC / AC 9 into the voltage of the AC network 10 if it was necessary because both tensions were different. The electrical output of the inverter module DC / AC 9 is also connected to the UPS (Uninterruptible Power Supply System) 6 for recharging it and powering the auxiliary transformer 5 for which the output of the UPS 6 is electrically connected to the input of the transformer of auxiliaries 5. The auxiliary transformer 5 has two power outputs, one is the auxiliary power supply AC 15 and the other is the auxiliary power supply for user 16. The auxiliary power supply AC 15 has as function to feed the components of the solar photovoltaic inverter 2 for its normal operation. In figure 2, for simplicity, it is observed that the auxiliary supply AC 15 is connected to the inverter module DC / AC 9 and to the control module 8, but it can feed more components of the solar photovoltaic inverter 2. The control module 8 is connected via data link, with the inverter module DC / AC 9 and with the connection / disconnection contactor 7 to which it sends control instructions. The control instructions are instructions such as stop, start, magnitude of the output voltage, magnitude of the output current, opening, closing, etc. The arrows indicate the direction of the current in the electrical connections.
    [0088] Figure 3 shows the general scheme of a modular solar photovoltaic inverter 3 according to the state of the art. The photovoltaic solar inverter 3 has the same structure as the solar inverter 2 except that it consists of several inverter modules DC / AC 9a-9n instead of a single inverter module.
    [0089] For any realization examples shown in Figures 1, 2 and 3, Figure 4 shows the main components of the inverter module 9.9a-9n. Each of the inverter modules 9, 9a-9n comprises a power stage 19 and a control stage 20. Each of the control stages 20 are connected to the control module 8 for the exchange of control setpoints. The function of the control stage 20 is to monitor and record the values of DC and bus voltage at the input of the module, the intensity at the output of the switching device and the temperature of the switching electronics as a whole. The registered values allow managing the status of the module, providing the trigger signals of the switching electronics and the opening / closing commands of the DC and AC contactors, the filter, the soft charging circuit and, additionally, the ventilation system . The power supply of this control stage 20 comes from the auxiliary transformer.
    [0090] Figure 5 shows the inverter module 9, the control stage 20 and the power stage 19. The main elements constituting the power stage 19 are the following: a DC bus 18, formed mainly by capacitors; switching electronics 26 (IGBT) in turn formed by semiconductor devices whose state is regulated by a controller; a power filter 23; and, a contactor of connection / disconnection 24 to the AC bus, whose opening or closing is controlled through the control stage 20. The power stage 19 also includes fuses 25 and protections against high values of current or voltage. It may also include soft charging circuits (not shown) to avoid current peaks inherent to the energization of the components themselves during the first moments in which power is supplied to the equipment. These soft charge circuits basically consist of a series of resistors that limit the current absorbed and whose effect is canceled by a bypass once the system is energized.
    [0091] With respect to the control module 8, the control module carries out, among others, the following functions:
    [0092] • User interface for configuration, visualization and monitoring of the equipment.
    [0093] • Central control of the equipment and synchronization to the network. Specifically:
    [0094] - It generates the common current setpoints of all the modules and carries out the start / stop command of each module.
    [0095] - Carry out the MPPt calculation (in the case that the converter is a solar inverter). .
    [0096] - Carry out the connection and disconnection maneuvers and bus loading and unloading.
    [0097] - Control and configure the protections and measurements of the equipment.
    [0098] - It carries out the real-time acquisition of the tension of the AC network and the voltage of the source.
    [0099] • Communication with the control of the modules
    [0100]
    [0101] In the following illustrative and non-limiting character, several examples of realization of the invention are described.
    [0102] For the first embodiment, figure 6 shows the intrinsic power system for auxiliary services of power converters according to the present invention applied to power converters as shown in figure 1.
    [0103] The power converter 1 comprising the intrinsic power system for auxiliary services according to the embodiment shown in figure 6 comprises the inverter module DC / AC 9 whose input is electrically connected to the DC source 4. The inverter module DC / AC 9 has two outputs, one output is electrically connected to the AC / AC converter 11 and the other output is connected to the sine-wave filter 12. The AC / AC converter 11 converts the output AC voltage of the inverter module DC / AC 9 into the voltage of the AC 10 network. The electrical output of the AC / AC converter 11 is connected to the AC 10 network by means of a connection / disconnection contactor 7. The electrical output of the AC / AC converter 11 is also connected to an input of the auxiliary transformer 5 with interposition of the contactor 21 while the output of the sine-wave filter 12 is connected to the other input of the auxiliary transformer 5 with interposition of the contactor 22. The auxiliary transformer 5 has two power outputs, one is the auxiliary power supply AC 15 and the other is the auxiliary power supply for the user 16. The auxiliary power supply AC 15 has the function of supplying the components of the power converter 1 for normal operation. In figure 6, for simplicity, it is observed that the auxiliary supply AC 15 is connected to the AC / AC converter 11 and to the control module 8, but it can feed more components of the power converter 1. The control module 8 is connected via data link, with the AC / AC converter 11, with the DC / AC 9 inverter module, with the connection / disconnection contactor 7 and with the input contactors 21 and 22 to the auxiliary transformer 5, to all of which it sends control slogans. The control instructions are instructions such as stop, start, magnitude of the output voltage, magnitude of the output current, opening, closing, etc. When there is voltage in the AC 10 network and the power converter 1 operates in "normal" or "production" mode, the contactors 7 and 21 are closed and the contactor 22 open. In this way, the current (power) produced by the AC / AC converter 11 is poured into the AC 10 network. When the control module 8 detects a cut with the AC network that can be caused by maintenance or failure of the AC network. the AC network, the control module 8 operates the intrinsic power system for auxiliary services in the following manner. The control module 8, by means of control commands, opens the contactor 7 for connection / disconnection to the AC network, closes the contactor 22 for connection / disconnection of the sine-wave filter AC, opens the contactor 21 and adjusts the voltage and current at the output of the inverter module DC / AC 9 that after being filtered by the sine-wave filter 12 arrives at the input of the auxiliary transformer 5, which generates the auxiliary supply AC 15 and optionally the auxiliary power supply of the user 16. The module of control 8 has a small battery 31 that allows it to perform the steps indicated above until it receives power from the transformer 5.
    [0104] For the second example of realization, Figure 7 shows the intrinsic power system for auxiliary services of power converters according to the present invention applied to a photovoltaic solar inverter as shown in Figure 2.
    [0105] The solar photovoltaic inverter 2, shown in Figure 7, comprises the inverter module DC / AC 9 having an electrical input and two electrical outputs. The electrical input is electrically connected to the DC source 4. An output of the DC / AC 9 inverter module is electrically connected to the AC 10 network through the connection / disconnection contactor 7. Optionally, the medium voltage AC / AC transformer can be installed. between the output of the connection / disconnection contactor 7 and the AC network 10. The output of the inverter module DC / AC 9 is also connected to a first input of the auxiliary transformer 5 with interposition of the contactor 21. The medium voltage transformer AC / AC 14 converts the AC output voltage of the inverter module DC / AC 9 into the voltage of the AC network if necessary because both voltages were different. The other electrical output of the DC / AC inverter module 9 is connected to the input of the sine-wave filter 12 whose output is connected to a second input of the auxiliary transformer 5 with interposition of the contactor 22. The auxiliary transformer 5 has two power outputs, one is the auxiliary supply AC 15 and the other is the user auxiliary supply 16. The auxiliary supply AC 15 has as function to feed the components of the solar photovoltaic inverter 2 for its normal operation. In figure 7, for simplicity, it is observed that the auxiliary supply AC 15 is connected to the inverter module DC / AC 9 and to the control module 8, but it can feed more components of the solar photovoltaic inverter 2 such as the contactors 21 and 22, and / or connection / disconnection unit 7. The control module 8 is connected by data link, with the inverter module DC / AC 9, with the connection / disconnection contactor 7 and with the contactors 21 and 22 to which it sends control slogans. The control instructions are instructions such as stop, start, magnitude of the output voltage, magnitude of the output current, opening, closing, etc. In "normal" operation mode ("production"), that is, when the solar inverter pours power to the AC network, the module 8, through control setpoints, closes the connection / disconnection contactor 7 to the AC 10 network, opens the contactor 22, closes the contactor 21 and adjusts the voltage and current to the output of the inverter module DC / AC 9. The inverter module DC / AC 9 also supplies the auxiliary transformer 5, which generates the auxiliary supply AC 15 and optionally the auxiliary supply of user 16. When the control module 8 detects a cut with the AC network that can be caused by tasks of maintenance or failure of the AC network, the control module 8, through control setpoints, opens the connection / disconnection contactor 7 to the AC 10 network, opens the contactor 21, closes the contactor 22 and adjusts the voltage and current at the output of the inverter module DC / AC 9, which after being filtered by the sine-wave filter 12, arrives at the auxiliary transformer 5 that generates the auxiliary supply AC 15 and optionally the auxiliary supply of the user 16. The control module 8 has a B ateria 31 that allows you to perform the steps indicated above until you receive power from the auxiliary transformer 5.
    [0106] For the third embodiment example, figure 8 shows the intrinsic power system for auxiliary services of power converters according to the present invention applied to a modular solar photovoltaic inverter as shown in figure 3.
    [0107] The modular photovoltaic solar inverter 3 shown in FIG. 8, which comprises the intrinsic power system for auxiliary services of the present invention, is of the "fixed voltage source module" type since only one of the inverter modules provides the necessary power for Auxiliary services Modular photovoltaic solar inverter 3 includes inverter modules DC / AC 9a-9n whose input is electrically connected to DC source 4. Each of the inverter modules DC / AC 9a-9n has an AC electrical outlet that connect with a common line 17 (AC bus) that is electrically connected to the AC 10 network by means of the connection / disconnection contactor 7. Optionally there can be the medium voltage AC / AC transformer 14 between the output of the connection / disconnection contactor 7 and the AC network 10. The medium voltage AC / AC transformer 14 converts the AC voltage present in the common line 17 to the output of the DC / AC 9a-9n inverter modules in the voltage of the AC network if necessary because both voltages were different. The common line 17 is also connected to an input of the auxiliary transformer 5 with interposition of the contactor 21 in such a way that the inverter modules 9a-9n feed the auxiliary transformer 5. In this embodiment, only one inverter module 9n of the inverter modules DC / AC 9a-9n has a second electrical output AC which is connected to the auxiliary transformer 5 with interposition of the sine-wave filter 12 and of the contactor 22. The auxiliary transformer 5 has two power outputs, one is the auxiliary power supply AC 15 and the other is the user auxiliary power supply 16, which it's optional. The auxiliary supply AC 15 has as function to feed the components of the modular solar photovoltaic inverter 3 for its normal operation. In figure 8, for simplicity, it is observed that the auxiliary supply AC 15 is connected to the inverter modules DC / AC 9a-9n, and to the control module 8, but it can feed more components of the modular solar photovoltaic inverter 3. control module 8 is connected by data link, with inverter modules DC / AC 9a-9n, contactors 21 and 22, and with the connection / disconnection contactor 7, to which it sends control instructions. The control instructions are instructions such as stop, start, magnitude of the output voltage, magnitude of the output current, opening, closing, etc.
    [0108] In "normal" operation mode, ie, when the modular solar inverter pours power to the AC network, the control module 8, by means of control commands, closes the on / off switch 7 to the network AC 10, closes the contactor 21, opens the contactor 22 and adjusts the voltage and current to the common output 17 of the inverter modules DC / AC 9a-9n. The DC / AC inverter modules 9a-9n also supply the auxiliary transformer 5, which generates the auxiliary supply AC 15 and optionally the auxiliary supply of the user 16. When the control module 8 detects a cut with the AC network that can be caused by maintenance tasks or due to failure of the AC network, the control module 8, through control setpoints, opens the connection / disconnection contactor 7 to the AC 10 network, opens the contactor 21, closes the contactor 22 and adjusts the voltage and the current at the output of the inverter module DC / AC 9n, which after being filtered by the sine-wave filter 12, reaches the auxiliary transformer 5 that generates the auxiliary supply AC 15 and optionally the user auxiliary supply 16. The control 8 has a battery 31 that allows it to perform the steps indicated above until it receives power from the auxiliary transformer 5.
    [0109] For the fourth embodiment example, Figure 9 shows the intrinsic power system for auxiliary services of power converters according to the present invention applied to a modular solar photovoltaic inverter as shown in Figure 3.
    [0110] The modular solar photovoltaic inverter 3 shown in Figure 9, which comprises the intrinsic power system for auxiliary services, is of the "module" type voltage source selectable "since it is possible to select which of the inverter modules provides the necessary power for the auxiliary services. The modular solar photovoltaic inverter 3 includes the inverter modules DC / AC 9a-9n whose input is electrically connected to the DC source 4. Each of the inverter modules DC / AC 9a-9n has an AC electrical outlet that connect to a common line 17 that is electrically connected to the AC 10 network through the connection / disconnection contactor 7. Optionally there can be the medium voltage AC / AC transformer 14 between the output of the connection / disconnection contactor 7 and the AC 10 network. The AC transformer / AC of medium voltage 14 converts the AC output voltage of the DC / AC 9a-9n inverter modules into the AC network voltage if necessary because both voltages were different. In this embodiment, all DC / AC inverter modules 9a-9n have a second AC electrical output that is connected to the sine-wave filter 12 with interposition of respective contactors 13a to 13n, respectively. The output of the sinusoidal filter 12 is connected to one of the inputs of the auxiliary transformer 5 with interposition of the contactor 22. The auxiliary transformer 5 has two power outputs, one is the auxiliary power supply AC 15 and the other is the auxiliary power supply of the auxiliary power supply. user 16 which is optional. The auxiliary supply AC 15 has as function to feed the components of the solar photovoltaic inverter 3 for its normal operation. In figure 9, for simplicity, it is observed that the auxiliary supply AC 15 is connected to the inverter modules DC / AC 9a-9n, and to the control module 8, but it can supply more components of the modular solar photovoltaic inverter 3. control module 8 is connected by data link, with inverter modules DC / AC 9a-9n, contactors 13a-13n, contactors 21 and 22, and with the contactor of connection / disconnection 7 to which sends control slogans . The control instructions are instructions such as stop, start, magnitude of the output voltage, magnitude of the output current, opening, closing, etc.
    [0111] In "normal" operation mode, ie, when the modular solar inverter pours power to the AC network, the control module 8, by means of control commands, closes the on / off switch 7 to the network AC 10, closes the contactor 21, opens the contactor 22 and adjusts the voltage and current to the common output 17 of the inverter modules DC / AC 9a-9n. The DC / AC inverter modules 9a-9n also supply the auxiliary transformer 5, which generates the auxiliary supply AC 15 and optionally the auxiliary supply of the user 16. When the control module 8 detects a cut with the AC network that can be caused by maintenance tasks or for failure of the AC network, the control module 8, by means of control slogans, opens the connection / disconnection contactor 7 to the AC 10 network, opens the contactor 21, closes the contactor 22, selects one of the inverter modules (for example module 9b), adjust the voltage and current to the output of the selected DC / AC inverter module and close the contactor (13b) corresponding to the selected inverter module (9b). The power (power) provided by the selected inverter module, after being filtered by the filter 12, arrives at the auxiliary transformer 5 that generates the auxiliary power AC 15 and optionally the auxiliary power supply of the user 16. The control module 8 has a battery 31 which allows it to perform the steps indicated above until it receives power from the auxiliary transformer 5. In the present example of realization it is possible to combine at least two DC / AC inverter modules to generate the voltage and current necessary to power the transformer 5. In in this case, the control module 8 would additionally close the contactors (13a-13n) of the selected DC / AC inverter modules and adjust the voltage and current to the common output 17 of the inverter modules DC / AC 9a-9n by means of control instructions .
    [0112] In all the above embodiments, both the power converter 1 and the solar inverters 2 and 3, in "normal" operation mode (also called "production" mode), the inverter modules (9a-9n) function as current sources. On the other hand, when there is a failure or disconnection to the AC network and the intrinsic power system of the present invention is applied, said inverter modules (9a-9n) have to function as voltage sources. This change in behavior in the inverter modules implies that the power filter 23 shown in figure 5 is not valid. Instead, the sine-wave filter 12 shown in FIG. 10 is used. Although both filters 12 and 23 shown in FIG. 10 appear the same, if they are in configuration but not in the values of the elements (coils, capacitors) that make up said filters 12, 23. That is to say, the sinusoidal filters are dimensioned in accordance with the output voltage of the inverter modules, which is different depending on whether it is supplied to the AC 10 network or to the auxiliary transformer 5. As it is observed in figure 10, the input of the sine-wave filter 12 is connected between the switching electronics 26 and the contactor 24.
    [0113] A possible embodiment of the sine-wave filter 12 used in the embodiments shown in Figures 7, 8 and 9 is shown in Figure 11. The sine-wave filter 12 comprises two series coils 27a, 27b / 28a, 28b / 29a, 29b per monophasic phase and a capacitor 30a, 30b, 30c connected in parallel between each two monophasic phases, so that the Pulse-Width Modulation "PWM" modulation frequency of the output voltage of the inverter module DC / AC 9 is converted to the 50/60 Hz frequency of the AC network.
    权利要求:
    Claims (10)
    [1]
    1. - Intrinsic power system for auxiliary services of power converters, comprising:
    • an auxiliary transformer (5) comprising at least: two inputs and an auxiliary AC power output (15);
    • at least two contactors (21,22);
    • a sinusoidal filter (12), whose output is connected to an input of the auxiliary transformer (5) with interposition of a contactor (22);
    • at least one DC / AC inverter module (9, 9a, 9n) comprising one input and two outputs; where the input is connectable to a DC source (4), one output is connected to the input of the sine-wave filter (12) and the other output is connected to a common AC line (17) which in turn is connected to the auxiliary transformer (5) with interposition of a contactor (21) and connectable to an AC network (10);
    • a connection / disconnection contactor to the AC network (7) located on the common AC line (17), between the output of the DC / AC inverter module (9) and the AC network (10);
    • a control module (8) configured for sending control commands and connected to at least:
    or the connection / disconnection contactor to the AC network (7)
    or the contactors (21,22);
    or the DC / AC inverter module (9);
    in such a way that the control module (8), through control setpoints, opens the connection / disconnection contactor to the AC network (7), opens the contactor (21) of the DC / AC inverter module, closes the contactor (22) output of the sine-wave filter AC (12) and adjust the voltage and current to the output of the DC / AC inverter module (9) that connects with the sine-wave filter (12) so that the auxiliary transformer (5) generates the AC auxiliary power.
    [2]
    2. - Intrinsic power system for auxiliary services of power converters according to claim 1, characterized in that it additionally comprises at least one DC / AC inverter module (9a-9n) with a single output connected to the AC line (17).
    [3]
    3. - intrinsic power system for auxiliary services of power converters according to claim 1, characterized in that it comprises at least two DC / AC inverter modules (9a-9n) connected by means of two contactors (13a-13n) to the sine-wave filter (12) , such that the control module (8) is configured to select from at least two DC / AC inverter modules (9) at least one DC / AC inverter module (9a-9n) to which to send the control instructions and where the contactor (13a-13n) associated with the inverter module DC / AC (9a-9n) selected receives a closing command.
    [4]
    4. - intrinsic power system for auxiliary services of power converters according to claim 1, characterized in that the DC / AC inverter module (9) comprises a control stage (20) and a power stage (19), where the stage of power (19) comprises at least: a fuses (25), a DC bus (18), a switching electronics (26), a contactor of connection / disconnection to the AC bus (24) and a power filter (23) .
    [5]
    5. - intrinsic power supply system for power converter auxiliary services according to claim 4, characterized in that the sine-wave filter (12) is connected between the switching electronics (26) and the AC connection / disconnection contactor (24) .
    [6]
    6. - intrinsic power system for auxiliary services of power converters according to claim 1, characterized in that the control module (8) comprises a form of power selected from: the DC source (4), a set of batteries (31) and the AC auxiliary supply (15).
    [7]
    7. - intrinsic power system for auxiliary services of power converters according to claim 1, characterized in that the sinusoidal filter (12) comprises at least two coils in series (27a, 27b / 28a, 28b / 29a, 29b) per phase monofasica and at least one capacitor (30a, 30b, 30c) connected in parallel between each two monophasic phases, such that the Pulse-Width Modulation modulation "PWM" of the output voltage of the DC / AC inverter module (9) it is converted to a 50/60 Hz frequency of the AC network (10).
    [8]
    8. Power converter characterized in that it comprises an intrinsic power system for auxiliary services according to any one of claims 1 to 7.
    [9]
    9. Solar inverter characterized in that it comprises an intrinsic power system for auxiliary services according to any one of claims 1 to 7.
    [10]
    10. Modular solar inverter characterized in that it comprises an intrinsic power system for auxiliary services according to any one of claims 1 to 7.
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    同族专利:
    公开号 | 公开日
    US20200153271A1|2020-05-14|
    ES2695630B2|2019-07-30|
    EP3651306A1|2020-05-13|
    US11070079B2|2021-07-20|
    WO2019008204A1|2019-01-10|
    EP3651306A4|2020-06-10|
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201730880A|ES2695630B2|2017-07-03|2017-07-03|INTRINSECO POWER SUPPLY SYSTEM FOR AUXILIARY SERVICES OF POWER CONVERTERS|ES201730880A| ES2695630B2|2017-07-03|2017-07-03|INTRINSECO POWER SUPPLY SYSTEM FOR AUXILIARY SERVICES OF POWER CONVERTERS|
    EP18828697.5A| EP3651306A4|2017-07-03|2018-06-29|Integrated power supply system for auxiliary services for power converters|
    PCT/ES2018/070468| WO2019008204A1|2017-07-03|2018-06-29|Integrated power supply system for auxiliary services for power converters|
    US16/628,583| US11070079B2|2017-07-03|2018-06-29|Integrated power supply system for auxiliary services for power converters|
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