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Coordinated fault ride-through method for wind farm grid-connected system via flexible direct current transmission

A flexible direct current transmission and fault ride-through technology, which is applied in wind power generation, control systems, electrical components, etc., can solve problems such as the inability to limit overcurrent of non-fault poles, uncontrollable power of wind farms, and blocking of non-fault poles to achieve voltage fluctuations Small size, reduced output active power, fast response

Active Publication Date: 2020-07-03
STATE GRID CORP OF CHINA +2
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method does not involve the protection device inside the wind turbine, it is easy to generate strong stress inside the wind turbine, and in the case of a single pole fault, this method cannot limit the overcurrent of the non-faulted pole, and it will also cause the non-faulted pole to be blocked.
In addition, the violent fluctuation of the AC voltage will lead to the instability of the system, and the output power of the wind farm using this method is uncontrollable

Method used

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  • Coordinated fault ride-through method for wind farm grid-connected system via flexible direct current transmission
  • Coordinated fault ride-through method for wind farm grid-connected system via flexible direct current transmission
  • Coordinated fault ride-through method for wind farm grid-connected system via flexible direct current transmission

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Embodiment Construction

[0032] This application uses the crowbar protection circuit inside the doubly-fed wind turbine, when the wind farm bus voltage V wfThe crowbar protection circuit is started when it is lower than the set startup threshold, and when the crowbar protection circuit is started, the insulated gate bipolar transistor (IGBT, Insulated Gate Bipolar Transistor) control pulse of the rotor side converter of the doubly-fed fan is blocked at the same time. characteristics, the reference voltage of the AC voltage control is set by the wind farm control system to control the bus voltage of the wind farm, so that when a single pole of the DC system fails and the current of the non-faulted pole exceeds the current setting limit, the commutation at the wind farm side is reduced. The device voltage is realized by using the crowbar protection circuit to realize the fault ride-through control. In this embodiment, the wind farm is divided into two states through the flexible DC transmission grid-con...

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Abstract

The invention provides a wind power plant coordination fault ride-through method through a flexible DC power transmission grid-connected system. Voltage reduction control of the flexible DC system wind power plant side converter is combined with flexible control of the wind turbine generator set crowbar to suppress the system overcurrent by using the rectifier bridge type crowbar protection circuit of the doubly-fed blower rotor side in the period of the unipolar short time fault of the DC system, and real-time control of active power and current is realized by regulating the blower end voltage in the control period so that the power transmission capacity of the non-fault polarity of the flexible DC system can be realized to the greatest extent, the situation of off-grid of the wind powerplant can be avoided, the impact to the AC power grid can be reduced and the method has certain significance in practical engineering.

Description

technical field [0001] The invention belongs to the technical field of electric power system control, and in particular relates to a coordinated fault ride-through method of a wind farm connected to a grid system via a flexible DC transmission. Background technique [0002] For wind farms connected to the grid via bipolar poles, when one of the poles fails, the pole converter will be blocked in a short time, and the current and power flowing through the faulty pole will drop to zero rapidly. Since the wind farm side converter (WFVSC) adopts constant AC voltage control and the control of the two poles is independent of each other, when one pole is locked, the other pole converter can still provide the rated voltage and frequency support for the wind farm, so wind power The farm will not reduce its active power output in response to a fault in the HVDC system. At this time, all the active power will be transferred to the non-fault pole, which will greatly increase the current...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02P9/10H02P101/15
CPCH02J3/386H02P9/105H02P9/107H02P2101/15Y02E10/76
Inventor 刘永民黄景慧毛玉宾刘万勋司瑞华张晓东秦开明孙思培程昱明贾鹏张丽华李甜甜王洋郝元钊于琳琳王圆圆苗福丰袁鹏秦亮刘开培葛思扬熊音笛李明月王放蒲清昕石维盛
Owner STATE GRID CORP OF CHINA
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