大规模风电直流外送系统单极闭锁场景下送端系统协调控制策略

doi:10.19595/j.cnki.1000-6753.tces.181337

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摘要当高压直流输电系统送端换流站发生单极闭锁故障时,换流站交流侧无功功率将出现过剩,导致换流站交流侧电压骤升,从而进一步引起送端电网末端风电场机端电压的骤升。为了保证送端系统的安全稳定运行,分析高压直流输电系统发生单极闭锁故障后送端系统的潮流分布和送端系统过电压产生的原因,结合典型双馈风电机组的功率可控运行区域及直流换流站的短时过载能力,提出计及双馈风电场及换流站的协调故障穿越控制策略。仿真结果表明,该方案既能够有效抑制直流单极闭锁故障下换流站交流侧暂态过电压,又能够保证大规模双馈风电机组在高压直流输电系统单极闭锁下不脱网运行,有效地增强了故障下送端系统的暂态稳定运行能力。

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关键词 ：高压直流输电系统, 单极闭锁, 双馈风电机组, 协调控制

Abstract：When the mono-polar blocking fault occurs at the sending converter of the high voltage direct current (HVDC) transmission system, the reactive power of the alternating current (AC) sending system will be surplus, which lead to the swell of the voltage of the AC sending system. For ensuring the sending system can operate in stability and security, the power flow of the sending system under HVDC system mono-polar blocking fault has been analyzed firstly. Furthermore, the mechanism of the overvoltage of sending system has been investigated. Combining the power controllable operation area of the doubly fed induction generator (DFIG) and the short-time overload capacity of the converter, the fault ride through control strategy by coordinating the DFIG and HVDC system converter is designed. The simulated results show that the proposed scheme can restrain the AC system’s overvoltage of HVDC system converter under mono-polar blocking fault and also ensure that the large-scale DFIG-based wind farms do not trip off the grid during the fault, which effectively enhancing the transient stability of the HVDC sending system.

Key words： High voltage direct current (HVDC) transmission system mono-polar block doubly fed induction generator (DFIG) coordinated control

收稿日期: 2018-08-06 出版日期: 2019-10-12

PACS:

TM721

基金资助:国家重点研发计划项目（2017YFB0902000）和国家电网科学技术项目（SGXJ0000KXJS1700841）资助

通讯作者: 姚骏男,1979 年生,博士,教授,博士生导师,研究方向为电机及其控制、电力电子与电力传动、风电技术以及新能源电能变换技术。E-mail：topyj@163.com

作者简介: 骆悦男,1994年生,硕士研究生,研究方向为电力电子变换及风电技术。Email：1264800142@qq.com

引用本文:

骆悦, 姚骏, 张田, 裴金鑫, 张锋. 大规模风电直流外送系统单极闭锁场景下送端系统协调控制策略[J]. 电工技术学报, 2019, 34(19): 4108-4118. Luo Yue, Yao Jun, Zhang Tian, Pei Jinxin, Zhang Feng. Coordinated Control Strategy of Large-Scale Wind Power Generation Sending System under Mono-Polar Block Fault. Transactions of China Electrotechnical Society, 2019, 34(19): 4108-4118.

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