• 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:
    Pitch system (1) comprising at least one pitch control unit (3) connected to a power supply network (5). Each pitch control unit (3) is connected to a rechargeable energy bank (6) and the pitch system (1) comprises a test module arranged to be activated in a test position. The test module comprises a braking module (8) connected to each of its pitch control units (3), and each brake module (8) is arranged to load a pitch control unit (3) with a given resistance Rb. This causes a voltage drop across the energy bank (6). The energy bank (6) is divided into a number of energy blocks (9) and each energy block (9) voltage drop? V is arranged to be detected by the test module when the brake module (8) is activated.
    公开号:DK201570425A1
    申请号:DKP201570425
    申请日:2015-07-01
    公开日:2017-01-30
    发明作者:Jesper Thomsen
    申请人:Deif As；
    IPC主号:
    专利说明:

    control system as well as a method for replacing an interchangeable energy source as well as the use island of pitch flow and flow method.
    Invention island relates to a pitch system comprising at least one pitch control hub, where pitch control hub is adapted to communicate with units comprising a motor native of the rotor positioning unit for positioning a rotor, which pitch control unit (s) is connected to an EL supply network, and to each pitch control unit rechargeable energy bank.
    The invention also relates to a method of testing an interchangeable energy bank belonging to a pitch system comprising at least one pitch control unit adapted to communicate with coupled units comprising a motor native by the pitch control unit, for positioning a rotor, which pitch unit (s) is connected to an electrical supply grid, and each pitch control unit is connected to the interchangeable energy bank.
    Finally, the invention relates to the use of the method and of the pitch system. In conjunction with wind turbines and offshore installations for utilization of subsea energy, pitch systems are used to pitch the rotors in relation to the wind / current so that the rotors take the right angle in relation to the wind-subsidiary water flow load. It is important that the wings of the system can be turned and adjusted correctly. For example, if a mill is to be stopped, each blade is rotated such that the leading edge of each blade faces forward with the wind, thereby causing the blade's blades to brake. The adjustment of each wing takes place independently of the other wings.
    For this adjustment or braking which is done by turning the wing about a long axis / pitch axis, energy is used for the transmission line network in what is referred to hereinafter simply as the supply network. It is therefore important that the wing is ensured at all times that energy supply can take place. However, the problem is that the supply network can fall out, making adjustment or braking impossible. If this situation arises, there is a risk that the mill will run smoothly.
    Therefore, an energy bank in the form of preferably rechargeable batteries is connected to each pitch control unit. It is important that these batteries have a capacity that allows the wing to be pitched by the battery bank in case the supply grid falls out.
    Therefore, it is also important that the battery bank is tested every now and then to measure the capacity. This is done by stopping the turbine / garden system and then testing the batteries. This can be done by pitching the wings exclusively using the energy of the batteries. If this pitching fails, you know that the batteries are defective and / or the capacity is too small. As a result, all the batteries will be replaced. Since many batteries are connected to each pitch control unit - typical for lead batteries 24 pcs. - it is an expensive and cumbersome process to ensure that the emergency system will function in the event of a power failure.
    It is also known to employ a system comprising a monitoring system which automatically changes the engine pitching the wings from an operation mode to a test mode. In test mode, the condition of the batteries can be tested by the motor loading the batteries with a certain value.
    However, the system is not suitable for identifying which batteries may be defective and which need to be replaced, as both power and voltage are measured for the entire energy bank. Also, the system is only suitable for use with a DC motor. In addition, both motor and brake resistance are engaged at the same time, and the torque of the motor is included in the measurement of the battery, as the motor current can be varied. This also makes the measurement unreliable.
    It is thus the object of the present invention to provide a system which does not have the disadvantages listed or which at least provides a useful alternative to the prior art.
    This is accomplished by a pitch system of the preamble set forth, and wherein the pitch system comprises a test module arranged to be actuated in a test position of the pitch system, said test module comprising a brake module connected to its own pitch control unit and each brake module adapted to load a pitch control unit. with a given resistor Rb, at which a voltage drop is provided across the energy bank, and that the energy bank is divided into a number of separate and electrically connected energy blocks, and that each voltage block voltage drop Δ V is arranged to be detected by the test module when the braking module is activated.
    As the energy bank is divided into modules that are each tested, it is possible to find the block which is either defective or which is assessed to be deployed as soon as possible, thereby giving rise to insufficient electricity supply if the mains supply is exposed. The interchangeable energy bank must take over for the pitch system to angle the rotor blades correctly. If there is an error message on the energy bank via the test module, it will mean that a replacement of a battery block takes place before the energy has come down so long that the energy bank puts it in the situation where it should actually take over the electricity supply from an output. wiring. In this way, replacement of the entire energy depot is saved, as well as it is possible to pinpoint any risks of failure in the emergency power supply. The test module is activated only when there is a disconnect to the supply network.
    The pitch control unit is a unit which is coupled to its own motor which controls a wing via a pitch axis. The pitch control unit controls the brake and monitors the system as such including output and input, voltage, phase conditions, temperature. It also includes a safety program so that if an error occurs, it will steer the wing to which it is connected into what is called the '' habitual position ''. This will slow the wing.
    The brake module itself may be an integral part of the pitch control unit or it may be a component located outside. The pitch motor can be either AC or DC type, synchronous, with or without magnets or asynchronous; the motor is part of the pitch system. In a further convenient embodiment according to claim 2, the energy bank comprises interchangeable batteries, and the energy bank is divided into a number of blocks containing a number of series connected batteries, and each energy block is arranged to supply the same voltage as the other energy blocks. The batteries are typically lead-acid batteries, which can also be recharged. But other batteries such as lithium batteries and ultracaps can also be used. It is essential that a division is made into blocks and that the total voltage from each block, for example by including the same number and type of batteries, is in principle the same, unless there is a fault on a block. The energy blocks are connected in series.
    It is noted that the batteries do not age at the same rate and that external conditions such as temperature affect the capacity of the batteries. In a further convenient embodiment according to claim 3, the test module comprises an algorithm which converts the voltage drop Δ V to a resistance value Rix and a capacitance value Cix for each energy block of number x, and that the test module is arranged to report an error at an energy block of number x. when its Cix and Rix value deviate from predefined limit value ranges [Ci '; Ci '] and [Ri'; Ri, which ranges include a capacitance value Ci and a resistance value Ri for the entire battery bank.
    By detecting the voltage drop across each energy block, it is possible through the algorithm to calculate what the resistance Rix is and what the capacitance Cix for each energy block is. These sizes Rix and Cix are very reliable for assessing the capacity of each energy block and thus the ability to supply power if the power grid plugs out. Ci 'and Ci' include the capacitance value Ci 'for the entire battery block applied to a deviation factor and Ri' and 'Ri' includes the resistance value Ri for the entire battery block applied to a deviation factor.
    If an error is reported on one of the blocks, the values of the capacitance and resistance are out of bounds, and the block in question will be replaced. In a further convenient embodiment according to claim 4, the algorithm is arranged to compare the resistance value Rix and the capacitance value Cix for each energy block with the number x with corresponding values for the other energy blocks and that the test module is arranged to report an error when an energy block Rix and Cix value are different from a predefined deviation value Δ A in the energy blocks in between.
    This incorporates an additional security measure for the energy bank with the possibility of securely defining a defective block. In a further convenient embodiment according to claim 5, the resistance value R 1 for each energy block is converted by an algorithm to a corresponding resistance value at a predefined temperature.
    The temperature used as a starting point is 20 degrees. Incorporating the temperature into the algorithm takes into account that the value of a resistor depends on the temperature conditions. Since the batteries in a wind turbine can be in areas with down to 30 degrees of frost and up to 60 degrees of heat, it is desirable that the resistance is thus normalized in relation to the calculations that are being carried out. For most batteries, the capacitance is compensated as a function of temperature. In a further convenient embodiment according to claim 6, the pitch system comprises at least two pitch control units, preferably three pitch control units, each arranged to monitor and control each connected unit such as the rotor angular motor.
    The system is typically used for wind turbines with three blades, but can of course also be used for wind turbines with fewer, for example, 2 blades.
    The system can also be used in systems that utilize the flow energy of the water.
    The invention also relates to a method as set out in the preamble, whereby also a test position is provided and the EL supply network is disconnected, that a test module comprising a brake module connected to its own pitch control unit is activated, at which a given resistance Rb charges the pitch control unit and the energy bank is divided into a number of discrete and electrically connected energy blocks and that each voltage block voltage drop Δ V is detected by the test module when the braking module is activated. In a further convenient embodiment according to claim 8, the energy bank comprises replaceable batteries and the energy bank is divided into a number of blocks, each containing batteries which are connected in series, and each energy block arranged to supply the same voltage as the other energy blocks and the test module measures the voltage drop Δ V over each energy block. In a further convenient embodiment according to claim 9, the test module by an algorithm Δ V converts a resistance value Rix and a capacitance value Cix for each energy block, and that the test module reports an error at an energy block when its Cix and Rix value deviate from predefined limit value intervals [ ci '; Ci '] and [Ri'; Ri, which values comprise a capacitance value Ci and a resistance value Ri for the entire energy bank, respectively. In a further convenient embodiment according to claim 10, the algorithm compares the resistance value Rix and the capacitance value Cix for each energy block with a corresponding value for the other energy blocks, and that the test module reports an error when an energy block Rix and Cix value is different from a predefined deviation value Δ A in the energy blocks in between and that the energy block in question is subsequently replaced with a new energy block.
    The invention also relates to the use of a pitch system according to any one of claims 1-5 and the use of a method according to any one of claims 6-9 for testing a DC energy bank in a wind turbine or a garden power plant. In a further convenient embodiment, the test module is activated after a specified time interval, during which testing activates a message about the energy state of each battery block.
    The invention also relates to the use of the pitch system of claims 1-6 for practicing the method of claims 7-10. In a further convenient embodiment, the braking module is arranged to brake the motor during a normal operation of the pitch system. In a further convenient and preferred embodiment, the pitching motor is an AC motor.
    However, the motor can also be a DC motor. In a further expedient embodiment, the limit values Ri'.Ri "and Ci ', Ci" are determined by empirical data or by measuring the voltage drop Δ Vi over the entire battery bank and based on the calculated average acceptable limit values tor dioc. In a further convenient embodiment, prior to the test module, the energy bank is subjected to a short load, thereby providing a truthful starting position for the test module.
    The invention will now be explained in more detail with reference to the drawing, in which
    FIG. 1 shows a pitch system according to the invention connected to external units
    FIG. 2 shows a sub-element of the figure shown in FIG. a pitch control unit
    FIG. 3 shows a brake module for loading the pitch control unit.
    FIG. 4 A and B show diagram of voltage drop when the brake module is activated.
    FIG. 1 shows a pitch system 1 according to the invention connected to a number of units 4, 4, 4, 4, pitch system 1 is shown in connection with a plant for operating a wind turbine comprising three blades, but can be used for offshore and for installations such as wind turbines with 2 wings. As a result of being shown to a three-blade wind turbine, the pitch system 1 comprises three pitch control units 3. Each pitch control unit 3 is connected to a motor 4 ”, 2 and an interchangeable energy bank 6. The energy bank 6 typically consists of rechargeable batteries such as lead batteries, Lithium. batteries or ultracaps batteries. Each energy bank 6 associated with a pitch control unit 3 is divided into blocks 9 as explained below.
    The pitch system 1 communicates with a slip ring 4 ”, which is a unit that
    Can transmit intrinsic signals and energy Tra a key to a rotating ae, and a nacelle 4 'which includes a main controller 11 and an electrical supply network 5.
    The electric motor 2 - an actuator - moves each blade (not shown in the drawing). As mentioned, a typical wind turbine has three blades, so the number of individually driven motors is three. The electric pitch system 1 has interface to the electrical system of the nacelle 4 'from which it receives an electric current from the supply network 5 to drive the motors 2 / blades.
    There are two primary functions of pitch system 1, one being the normal operation, where pitch system 1 is used to optimize the control of the blades in all wind / flow situations, and the other is to brake the blades. This braking function is performed by moving the blade from the operation, which is from 0 ° to 30 ° depending on the actual average wind speed, to a blade position of 90 °, that is, the edge of the blade faces the wind direction / wave direction. The three motors 2 must be controlled individually and independently.
    FIG. 2 shows a sub-element of the comprising shown in FIG. a pitch control unit 3 and a brake 8. The pitch control unit 3 is connected to an energy bank 6, which in this example is divided into 4 energy blocks 9: namely block 1, block 2, block 3, block 4. The energy bank 6 is an interchangeable energy bank and since is divided into a series of blocks 9 whose resistance Rix and whose capacitance Cx can be calculated from the voltage drop Δ V when the brake is applied, it is possible from this to determine whether one of the blocks is defective and therefore needs to be replaced. , or if there is one of the blocks that will soon become defective and therefore should be replaced before the damage has occurred.
    FIG. 3 shows a brake module 8 for loading a pitch control unit 3. The load 13 provided by a resistor Rb is applied after a test module has been activated and the EL supply from the supply network is disconnected. This results in a voltage drop Δ V over each block 1,2,3,4.
    The voltage drop Δ V is measured in the interval from the moment the load Rb sets to time T1 and up to time T2 which is approx. 1/100 part second before time T3, which is the time when load Rb is removed. The voltage drop Δ Vi for all blocks is recorded and the voltage drop Δ V for each block is recorded.
    The voltage drop Δ V for each block 9 causes the capacitance value Cix for each block 9 and the resistor value Rix for each block 9 to be calculated from an algorithm:
    Calculation of Rix which is the resistance of a single block with the number x can be calculated from the following:
    Rix = (UT1x-UT2x) * Rb / UT2
    Calculation of Cix, which is the capacitance of each block with the number x, can be calculated from the following
    Cix = (UT2x-UT2x-1) * UT2 / (Rb * (T3-T1))
    The symbols are as follows:
    Ci The capacitance of the entire energy bank [F]
    Ci, avarage The capacitance, average value for each block [F]
    Cix The capacitance for block number x [F], x = 1 ..4
    Ri Resistance for the entire energy bank [Ω]
    Ri, avarage Modstan. Average value for each block [Ω]
    Rix Resistance for block number x [Ω], x = 1..4
    Rb Resistance; brake resistance [Ω], T1 Time where Rb is activated [s] T2 Time where minimum voltage occurs.
    [s] T3 Time when Rb is removed.
    [s] UT 1 Voltage measured at time T1 for the entire energy bank [V] UT1, x Voltage measured at time T1 for block x [V], x = 1..4 UT2 Voltage measured at time T2 for the entire energy bank [V] UT2 , x Voltage measured at time T2 for block x [V], x = 1 ..4 UT3 Voltage measured at time T1 for the entire energy bank [V]
    The voltage drop Δ Vi for all blocks 9 gives rise to the fact that the capacitance value Ci for all blocks and the resistor value Ri for all blocks (ie the entire energy bank 6) can be calculated from an analog algorithm:
    Ci can then be calculated to
    Ci = UT2 * UT2 / Rb * (T3-T1)
    And Ri can be calculated:
    Ri = (UT 1 -UT2) * Rb / UT2
    Based on this, an average value is calculated for each battery block:
    Ri, average: Ri / number of blocks Ci, average: Ci * number of blocks
    Limit values for what gives an error message will be a certain percentage P, for example 10% of the average values for the resistance and capacitance.
    If a value of P of 10% is used, error message will occur when Error message:
    Ri - Ri, average * (1 + 0.1)> Rix> Ri, average * (1-0.1) = Ri ”
    Ci - Ci, average * (1 + 0.1) ^ Cix> Ci, average * (1-0.1) = Ci '
    If one of the above two equations is not valid, there is an error to report.
    In addition, the algorithm includes that the resistance value Rix and the capacitance value Cix for each energy block 9 are compared with corresponding values for the other energy blocks 9. The test module reports an error when an energy block 9 Rix and Cix value is different from a predefined deviation value Δ A in the energy blocks 9 between .
    FIG. 4 A and B thus show the principle of the measurement that takes place for each block and for the total block, with x = 0 being the whole block being measured and for X = 1,2,3,4 each single block, using 4 blocks in this example.
    FIG. 4A shows the voltage drop for the entire block in time T1 to T2 and is measured between UT1x and UT2x. FIG. 4B shows the voltage drop for each block 1,2,3,4 and with the nomenclature as indicated above.
    All blocks 9 are tested with a particular load - the brake resistance
    Rb. The load is set such that a test sequence simulates current and a time when the motor will have to position the blade to its 0 position. The brake is started / stopped with a Brake Chopper. The values of Ri, Ci, Rix and Cix are all stored over time so that the deviation of value over time can be evaluated.
    The resistance value R 1 for each energy block 9 is converted by an algorithm to a corresponding resistance value at a predefined temperature.
    The resistance is normalized to a temperature of 20 degrees, which means that the specific temperature coefficient is 0.00393 1 / ° C from 20 ° C.
    This gives: R_normalized = Ri (1 + 0.0039 (20 temperature)).
    权利要求:
    Claims (11)
    [1]
    A pitch system (1) comprising at least one pitch control unit (3) each pitch control unit (3) adapted to communicate with units (4 ', 4', 4 '') comprising a motor (2) indented by the pitch control unit for positioning of a rotor to which pitch control unit (s) (3) is connected to an EL supply network (5), and each pitch control unit (3) is connected to a rechargeable energy bank (6) characterized in that the pitch system (1) comprises a test module arranged to being activated in a test position for the pitch system (1), said test module comprising a brake module (8) connected to each pitch control unit (3) and each brake module (8) adapted to load a pitch control unit (3) with a given resistance Rb at which a voltage drop is provided across the energy bank (6), and the energy bank (6) is divided into a plurality of discrete and electrically connected energy blocks (9) and each voltage block (9) voltage drop AVer arranged to be recorded by the test module, when the brake module (8) is activated.
    [2]
    Pitch system (1) according to claim 1, characterized in that the energy bank (6) comprises replaceable batteries and that the energy bank (6) is divided into a number of blocks (9) containing a number of series connected batteries and that each energy block (9) is arranged for to supply the same voltage as the other energy blocks (9).
    [3]
    Pitch system (1) according to any one of the preceding claims, characterized in that the test module comprises an algorithm which converts the voltage drop AV to a resistance value Rix and a capacitance value Cix for each energy block (9) with number x and that the test module is arranged to report a error of an energy block (9) of number x when its Cix and Rix value deviate from predefined limit value ranges [Ci '; Ci '] and [Ri'; Ri '] which ranges include a capacitance value Ci and a resistance value Ri for the entire battery bank (6).
    [4]
    4. Pitch system (1) follows any of the preceding claims characterized in that the algorithm is designed to compare the resistance value Rix and the capacitance value Cix for each energy block (9) with number x with corresponding values for the other energy blocks (9) and that the test module is designed to report an error when an energy block (9) Rix and Cix value are different from a predefined deviation value Δ A in the energy blocks (9) between.
    [5]
    Pitch system (1) according to any of the preceding claims, characterized in that the resistance value R 1 for each energy block (9) is converted by an algorithm to a corresponding resistance value at a predefined temperature.
    [6]
    Pitch system (1) according to any one of the preceding claims, characterized in that the pitch system (1) comprises at least two pitch control units (3) preferably three pitch control units (3) each adapted to monitor and control each unit such as the motor (2). for angling the rotor.
    [7]
    A method of testing an interchangeable energy bank (9) associated with a pitch system (1) comprising at least one pitch control unit (3) adapted to communicate with coupled units (4) comprising a motor (2) indented by the pitch control unit ( 3), for positioning a rotor, to which pitch control unit (s) (3) is connected to an EL supply network (5), and that each pitch control unit (3) is connected to an interchangeable energy bank (9) characterized by providing a test position and switching off the EL supply network (5), activating a test module comprising a braking module (8) connected to its own pitch control unit (3), at which a given resistor Rb charges the pitch control unit (3), and the energy bank (6) is divided into a the number of disconnected and electrically connected energy blocks (9) and that each voltage block (9) voltage drop AV is detected by the test module when the braking module (8) is activated.
    [8]
    Method according to claim 7, characterized in that the energy bank (6) comprises interchangeable batteries and the energy bank (6) is divided into a number of energy blocks (9) each comprising batteries connected in series and each energy block (9) arranged to supply the same voltage such as the other energy blocks (9) and that the test module measures the voltage drop Δ V over each energy block (9).
    [9]
    Method according to claim 7 or 8, characterized in that the test module converts Δ V to an resistance value Rix and a capacitance value Cix for each energy block (9) by an algorithm, and the test module reports an error on an energy block (9) when its Cix and Rix value differs from predefined limit value ranges [Ci '; Ci '] and [Ri'; Ri '] which values comprise a capacitance value Ci and a resistance value Ri for the entire energy bank, respectively (6).
    [10]
    Method according to any one of claims 7-9, characterized in that the algorithm compares the resistance value Rix and the capacitance value Cix for each energy block (9) with a corresponding value for the other energy blocks (9) and that the test module reports an error when an energy block (9) The Rix and Cix value is different from a predefined deviation value Δ A in the energy blocks (9) between and that the energy block (9) is subsequently replaced by a new energy block (9).
    [11]
    Use of a pitch system according to any one of claims 1-6 and use of a method according to any of claims 7-10 for testing a DC energy bank in a wind turbine or a garden power plant.
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    同族专利:
    公开号 | 公开日
    EP3317515A1|2018-05-09|
    DK178812B1|2017-02-13|
    US10620269B2|2020-04-14|
    US20180172775A1|2018-06-21|
    CN107735568B|2019-08-27|
    EP3317515B1|2019-04-03|
    CN107735568A|2018-02-23|
    WO2017001321A1|2017-01-05|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DKPA201570425A|DK178812B1|2015-07-01|2015-07-01|Pitch System and method for testing of a replaceable energy bank as well as the use of pitch system and method|DKPA201570425A| DK178812B1|2015-07-01|2015-07-01|Pitch System and method for testing of a replaceable energy bank as well as the use of pitch system and method|
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    PCT/EP2016/064809| WO2017001321A1|2015-07-01|2016-06-27|Pitch system and method for test of a power bank and use of the pitch system for performing the method|
    US15/578,650| US10620269B2|2015-07-01|2016-06-27|Pitch system and method for test of a power bank and use of the pitch system for performing the method|
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