A reactive power emergency control method based on fan load reduction operation
A technology for emergency control and load reduction, applied in reactive power compensation, AC network voltage adjustment and other directions, which can solve problems such as high voltage ride through in wind farms
Active Publication Date: 2020-08-18
ZHEJIANG UNIV +1
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Problems solved by technology
In order to give full play to the local voltage regulation ability of wind power participating in the system and solve the problem of high voltage ride-through of wind farms under DC blocking, the invention discloses a reactive power emergency control method based on wind turbine load reduction operation
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[0072] We use the proposed method to image 3 The wind farm send-out system shown was verified. After the DC blocking signal is issued, start the reactive power emergency control strategy of the wind farm, and distribute the reference value command of the fan power in real time according to the voltage measurement value of the wind power access point. By comparing the voltage waveform of the wind farm access point before and after the implementation of the proposed control strategy, this The method proposed by the invention is verified.
[0073] Adopt the inventive method to carry out simulation calculation to embodiment, the result is as follows:
[0074] Figure 4 The overvoltage suppression effect under different control strategies is given, among which control strategy 1 adopts traditional AVC control, control strategy 2 is no-voltage control, and control strategy 3 adopts reactive power emergency control proposed by the present invention. It can be seen from the figure...
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The invention discloses a reactive emergency control method based on fan load shedding operation. The method comprises the steps of: obtaining reactive power required by overvoltage suppression; calculating the reactive power limit of a double-fed fan; and finally, according to the relation between the reactive power required by the overvoltage suppression and the reactive power limit of the stator and the rotor of the double-fed fan, providing a reactive emergency control strategy based on fan load shedding operation, employing the fast active control of the active power of the double-fed fanto increase the reactive power limit of the double-fed fan in a short time and improve the reactive support capacity of the double-fed fan in a transient process so as to effectively suppress the overvoltage of the direct current blocking transient state. The reactive emergency control method increases the reactive limit of the wind field as much as possible on the premise of ensuring the reliability of the system to provide reactive support during faults so as to solve the problem of high-voltage pass-through of the wind field in the direct current shutting. The control method can be taken as effective reference of the reactive emergency control of a large-scale wind power send-out system and cooperative control with other reactive devices.
Description
technical field [0001] The invention relates to a reactive power emergency control strategy of a wind farm, in particular to a reactive power emergency control method based on wind turbine load reduction operation. Background technique [0002] Many large-scale wind farms in my country are far away from the load center. For the actual long-distance transmission of wind power generation, HVDC transmission is generally used to transmit 1000MW wind power generation. Since the HVDC converter consumes a large amount of reactive power (accounting for about 30% to 40% of its active power), when different types of faults occur in the AC / DC system and cause DC blocking, the remaining reactive power in the converter station will cause Transient overvoltage problem. [0003] Traditionally, voltage adjustment usually uses switching capacitor banks, changing transformer taps, and installing reactive devices such as SVC and STATCOM to maintain local voltage stability. However, consideri...
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IPC IPC(8): H02J3/16
CPCH02J3/16Y02E40/30
Inventor 汪震周昌平郭小龙
Owner ZHEJIANG UNIV