| 引用本文: | 赵东君,郭春义,叶全,樊鑫,赵峥,李探.抑制风电场经LCC-HVDC并网系统交流过电压的无功功率分散协同控制方法[J].电力自动化设备,2024,44(1):88-94. |
| ZHAO Dongjun,GUO Chunyi,YE Quan,FAN Xin,ZHAO Zheng,LI Tan.Reactive power decentralized cooperative control method for restraining AC overvoltage of wind farm via LCC-HVDC grid-connected system[J].Electric Power Automation Equipment,2024,44(1):88-94. |
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| 摘要: |
| 针对风电场经基于电网换相换流器的高压直流(LCC-HVDC)并网系统换相失败导致的送端交流过电压问题，提出了无功功率分散协同控制方法。首先，研究了换相失败期间送端交流系统公共连接点(PCC)处电压和盈余无功功率特性。然后，从PCC处电压和无功特性出发，基于无功-电压耦合关系及交流侧潮流方程，分别确定了基于本地功率电压特征的LCC整流站触发角及风电场站无功功率参考值，通过分散控制LCC和风电场实现协同抑制PCC处过电压的目的。最后，在PSCAD/EMTDC中搭建了风电场经LCC-HVDC并网系统模型并进行了仿真研究，结果表明所提出的分散协同控制方法可以有效抑制换相失败后恢复期间的交流过电压水平。 |
| 关键词: 风电场 电网换相换流器 交流过电压 无功功率分散 协同控制 换相失败 |
| DOI：10.16081/j.epae.202301015 |
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| 基金项目:国家电网有限公司总部科技项目(5200-202256077A-1-1-ZN) |
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| Reactive power decentralized cooperative control method for restraining AC overvoltage of wind farm via LCC-HVDC grid-connected system |
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ZHAO Dongjun1, GUO Chunyi1, YE Quan1, FAN Xin1, ZHAO Zheng2, LI Tan2
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1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209, China
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| Abstract: |
| Aiming at the problem of sending-end AC overvoltage caused by commutation failure in wind farm via line commutated converter based high voltage direct current(LCC-HVDC) grid-connected system, a reactive power decentralized cooperative control method is proposed. First of all, the AC voltage and surplus reactive power characteristics of the point of common coupling(PCC) at the sending-end AC system during the commutation failure period are analyzed. Then, starting from the reactive power and voltage characteristics at PCC, the trigger angle value of LCC rectifier station and reactive power reference value of wind farm station based on their own power and voltage characteristics are determined respectively by using the reactive power-voltage coupling relationship and AC-side power flow equation. The purpose of cooperative suppression of overvoltage at PCC is achieved by decentralized control of LCC and wind power station. Finally, the model of wind farm via LCC-HVDC grid-connected system is built in PSCAD/EMTDC and the simulation research is carried out. The results show that the proposed decentralized cooperative control method can effectively restrain the AC overvoltage level during the recovery period after commutation failure. |
| Key words: wind farms line commutated converter AC overvoltage reactive power dispersion cooperative control commutation failure |
