• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Electric circuit for feeding centrifugal pumps, comprising a power supply panel (2) for the pump (1) connected to an alternating current distribution network (3) and said pump (1) through a supply line (4) provided with a timer (5) that regulates the operating time of the pump (1); which also includes a solar module with photovoltaic panels (6) and a solar micro-inverter (7) connected in parallel to the alternating current bus of the pump (1), which converts the direct current generated by the solar module into alternating current and it injects it into the supply line (4) of the pump, with the same values of voltage, frequency and phase angle deviation as the current from the distribution network (3), when the timer activates the operation of the pump. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2753221A1
    申请号:ES201930691
    申请日:2019-07-25
    公开日:2020-04-07
    发明作者:De Bonilla Carlos Olmos
    申请人:Eos Itr S L；
    IPC主号:
    专利说明:

    [0001]
    [0002] Electric circuit for feeding centrifugal pumps.
    [0003]
    [0004] Technical sector
    [0005]
    [0006] The invention falls within the electrical sector, more specifically in the sector of power circuits specially intended to supply the electrical energy consumed by centrifugal pumps, driven by alternating current (AC) motors.
    [0007]
    [0008] State of the prior art
    [0009]
    [0010] Any water pump can be powered from a photovoltaic generator. A first approximation to its classification distinguishes between those that are fed by direct current (DC) and those that are fed by alternating current (AC).
    [0011]
    [0012] The DC powered pumps are positive displacement (diaphragm, piston, eccentric helical screw ...) and they cover small applications, less than 500 m4 / day and their market is linked to recreation (boats, caravans, secondary houses .) where operating times are usually limited to a few hours a day, a few days a year, which means low reliability requirements. In contrast, the market for supplying towns, industrial and agricultural applications is covered with centrifugal pumps driven by induction motors powered by alternating current (AC).
    [0013]
    [0014] The centrifugal pump is currently the most widely used machine for pumping liquids in general. Centrifugal pumps are always rotating and transform the mechanical energy of an impeller into kinetic or pressure energy of an incompressible fluid. These centrifugal pumps have many applications in the industry as they are suitable for almost any use. The most common are those that are built with a single impeller, covering capacities up to 500 m3 / h and gauge heights up to 100 m, with standard speed electric motors.
    [0015] These pumps are fed directly from the network or through frequency inverters, which allow them to be controlled (starting and stopping on ramps, detection of abnormal situations ...). A variable frequency drive (VFD), English Variable Frequency Drive or (AFD), Adjustable Frequency Drive, is a system for controlling the rotational speed of an alternating current (AC) motor by controlling the frequency of power supplied to the motor.
    [0016]
    [0017] The standard frequency inverters are designed to be powered from the conventional electrical network and incorporate an AC / DC converter and use an output to generate the wave with which the motors are finally controlled. To power these drives with photovoltaic generators, they must be connected directly to their internal DC bus, ensuring that the operating voltage of the photovoltaic generator is greater than V2 * 230V = 325V (single-phase) or 3V2-400V = 540V (three-phase) . Therefore, to reach these voltages, about 9 modules (3,015 kWp and 15.3 m2) are required for a single-phase motor and 15 modules (5,025 kWp and 25.5 m2) for a three-phase motor.
    [0018]
    [0019] In summary, photovoltaic systems for pumps currently present two problems: On the one hand, they are only used in direct current (DC) installations, of small size and use for a few hours and of low volume; on the other hand, they require a large photovoltaic power that implies a large photovoltaic generator surface, and a speed variator (expensive equipment).
    [0020]
    [0021] Explanation of the invention
    [0022]
    [0023] The circuit for supplying the centrifugal pumps object of this invention is of the type described in the preamble of claim 1 and comprises a pump supply panel connected to an alternating current distribution network, and to said pump through a line supply with a timer that regulates the pump's operating time.
    [0024]
    [0025] According to the invention, this power circuit comprises at least one solar module of photovoltaic panels and a solar micro-inverter connected in parallel to the AC bus of the pump and which converts the direct current generated by the solar module in alternating current, said inverter carrying out the injection of alternating current into the pump supply line, with the same values of voltage, frequency and phase angle deviation as the current from the distribution network, when the timer activates pump operation.
    [0026]
    [0027] When the timer allows the flow of current from the distribution network to the pump, the micro-inverter synchronizes with the electrical network, working in parallel to the network and reducing the consumption of alternating current from the distribution network by the pump , depending on the irradiance received by the solar panels to which said micro-inverter is connected.
    [0028]
    [0029] With the mentioned characteristics, the operating principle of the power circuit of the invention is as follows:
    [0030]
    [0031] When the pump is activated:
    [0032] - The micro-inverter detects voltage in the power line;
    [0033] - the micro-inverter checks that the values of voltage, frequency, and phase angle deviation are within the accepted values
    [0034] - the inverter connects to the grid, and synchronizes with it
    [0035] - the inverter injects the current into the grid under the same conditions of frequency and voltage;
    [0036] - at this time the consumption of the pump is reduced as a function of the energy injected by the inverter which is in turn proportional to the irradiance received by the solar panels.
    [0037]
    [0038] When the pump is deactivated:
    [0039] - The micro inverter detects that the frequency and voltage values are out of range and disconnects the power coming from the solar panels.
    [0040]
    [0041] Brief description of the content of the drawings.
    [0042]
    [0043] To complement the description that is being made and in order to facilitate the understanding of the characteristics of the invention, a set of drawings is attached to the present specification in which, by way of illustration and not limitation, the following has been represented:
    [0044] - Figure 1 shows a one-line diagram of an example of embodiment of the circuit for feeding centrifugal pumps, according to the invention.
    [0045]
    [0046] Detailed exposition of embodiments of the invention.
    [0047]
    [0048] Figure 1 shows the supply circuit for centrifugal pumps according to the invention, in which the centrifugal pump (1) is represented by the corresponding motor.
    [0049]
    [0050] This supply circuit includes: a supply panel (2) for the pump connected to an alternating current distribution network (3) and said pump (1) through a supply line (4) provided with a timer (5 ) that regulates the operating time of the pump (1); a solar module with photovoltaic panels (6) and a solar micro-inverter (7) connected in parallel to the alternating current bus of the pump (1) and which converts the direct current generated by the solar module into alternating current.
    [0051]
    [0052] As mentioned above when the micro-inverter detects voltage in the power line (4), due to the activation of the pump (1) by the timer (5), the micro-inverter (7) detects voltage in the power line, checks that the values of voltage, frequency, and phase angle deviation, are within the accepted values, connects to the network synchronizing with it and injects current in the same conditions of frequency and voltage; thus reducing the current consumption of the network by the pump.
    [0053]
    [0054] The number of photovoltaic panels (6) and the power of the micro-inverter (7) are a function of the power of the pump (1), the power of the micro-inverter (7) always being less than that of the pump (1) . For example, with a 750W and 600W power pump in the inverter a 670Wp solar generator is required. Or, with a 1,000W power pump and a 1,000W inverter, a 1,100Wp solar generator is required.
    [0055]
    [0056] The impact on consumption is directly related to the irradiance in the area depending on the time of year, for a pump like the one in the first example cited previously, with a continuous operation of 12 hours between 7:00 and 18:00 in Valencia, a savings of 52% has been quantified.
    [0057]
    [0058] Advantages of the system compared to the solutions currently used:
    [0059]
    [0060] - It is applicable to any network connected centrifugal pump, without the need to use a variable speed drive.
    [0061] - It is also applicable to any small power pump (from 500W). - Low direct current voltage, less than 50V, compared to much higher voltages for solutions using a variable speed drive, so you offer greater security.
    [0062] - Lower necessary generator surface: 3.4 m2 compared to 15 m2 in single-phase pumps.
    [0063] - Low inverter cost compared to variable speed drives.
    [0064] - It does not influence the flow of the installed pump designed according to user needs.
    [0065] - Safety in the electrical service (connection to the grid), the flow does not depend on the irradiance, the energy saving does.
    [0066] - Ideal for pumps with continuous operating regime in periods of high irradiance (spring and summer: Pools, irrigation pumps ...).
    [0067] - Savings according to latitude of up to 65% of daily consumption under the conditions mentioned in the previous point.
    [0068] - Scalable according to the power of the pump.
    [0069]
    [0070] Once the nature of the invention has been sufficiently described, as well as a preferred embodiment, it is stated for the appropriate purposes that the materials, shape, size and arrangement of the described elements may be modified, provided that this does not entail an alteration of the essential features of the invention that are claimed below.
    权利要求:
    Claims (2)
    [1]
    1 Electric circuit for feeding centrifugal pumps, comprising a power supply panel (2) for the pump (1) connected to an alternating current distribution network (3) and said pump (1) through a supply line power supply (4) provided with a timer (5) that regulates the operating time of the pump (1), characterized in that it also comprises a solar module with photovoltaic panels (6) and a solar micro-inverter (7) connected in parallel to the alternating current bus of the pump (1), which converts the direct current generated by the solar module into alternating current and injects it into the power supply line (4) of the pump, with the same values of voltage, frequency and angle deviation of phase that the current coming from the distribution network (3), when the timer activates the operation of the pump.
    [2]
    2.- Electric circuit for feeding centrifugal pumps, characterized in that the number of photovoltaic panels (6) and the power of the micro-inverter (7) are a function of the power of the pump (1), the power of the micro- inverter (7) slightly lower than that of the pump (1).
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    同族专利:
    公开号 | 公开日
    CN114144952A|2022-03-04|
    ES2753221B2|2020-11-05|
    WO2021014043A1|2021-01-28|
    引用文献:
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    CN104682222A|2013-11-29|2015-06-03|国家电网公司|Solar condensation preventing device for switch cabinet|
    CN204668784U|2015-05-26|2015-09-23|汪清明|A kind of outdoor garden high-low voltage electric power distribution cabinet of solar powered cooling|
    CN208478886U|2018-06-29|2019-02-05|佛山市众汇达电气科技有限公司|A kind of Novel bunk press-fitting electric cabinet|
    CN208835541U|2018-10-15|2019-05-07|江苏华耀电器设备有限公司|A kind of outdoor switchgear|
    法律状态:
    2020-04-07| BA2A| Patent application published|Ref document number: 2753221 Country of ref document: ES Kind code of ref document: A1 Effective date: 20200407 |
    2020-11-05| FG2A| Definitive protection|Ref document number: 2753221 Country of ref document: ES Kind code of ref document: B2 Effective date: 20201105 |
    优先权:
    申请号 | 申请日 | 专利标题
    ES201930691A|ES2753221B2|2019-07-25|2019-07-25|ELECTRICAL CIRCUIT FOR SUPPLYING CENTRIFUGAL PUMPS|ES201930691A| ES2753221B2|2019-07-25|2019-07-25|ELECTRICAL CIRCUIT FOR SUPPLYING CENTRIFUGAL PUMPS|
    CN202080053147.0A| CN114144952A|2019-07-25|2020-07-20|Circuit for supplying power to centrifugal pump|
    PCT/ES2020/070469| WO2021014043A1|2019-07-25|2020-07-20|Electric circuit for powering centrifugal pumps|
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