抑制直流连续换相失败的调相机暂态强励控制策略Research on Transient Forced Excitation Control Strategy of Synchronous Condenser for Continuous Commutations Failure Mitigation
王龙飞,华文,石博隆,王博文,周升彧,申屠磊璇,楼伯良
WANG Longfei,HUA Wen,SHI Bolong,WANG Bowen,ZHOU Shengyu,SHENTU Leixuan,LOU Boliang
摘要(Abstract)：
直流连续换相失败严重威胁电网的安全稳定运行,若换相失败次数过多,直流将发生单级或双极闭锁,可能引起电网的频率和电压失稳,研究可行的抑制直流连续换相失败的措施十分必要。为此,提出了调相机持续暂态强励以抑制直流换相失败的控制策略。首先介绍了直流换相失败的机理及影响因素,然后分析了调相机常规励磁控制策略在直流连续换相失败期间无法持续提供动态无功支撑的原因,最后提出了调相机以换流站交流母线电压跌落作为判断标准,在直流换相失败期间持续强励的控制措施,并基于华东电网典型数据进行了仿真验证。仿真结果表明,该控制策略能够充分利用调相机的动态支撑能力,有效减少直流因交流故障引起的连续换相失败次数,防止控制保护系统动作导致直流闭锁而威胁受端电网安全稳定运行。
Continuous DC commutation failure imposes a threat to operation safety and stability of power grid and in case of multiple commutation failures unipolar or bipolar block may occur in DC lines and whereas leads to frequency and voltage instability of power grid. Therefore, it is essential to work out feasible countermeasures against continuous DC commutation failure. This paper proposes a new control strategy of synchronous condenser using transient forced excitation for continuous commutations failure mitigation. Firstly,the internal mechanism and influencing factors of DC commutation failure are introduced; then the reason that the commonly used excitation control strategies fail to support dynamic reactive power during continuous DC commutation failure is expounded; finally, a control measure of forced excitation in case of DC commutation failure which takes AC bus voltage drop as judgment criterion is presented and verified based on typical data from eastern China power grid. The simulation result indicates that the control strategy can fully utilize the dynamic support capacity of the synchronous condenser and reduce continuous commutation failure times due to AC faults, preventing DC block from jeopardizing operation safety and stability of the receiving-end grid arising from control and protection system action.
关键词(KeyWords)：
直流输电;换相失败;调相机;暂态强励
DC transmission;commutations failure;synchronous condenser;transient excitation
基金项目(Foundation): 国网浙江省电力有限公司科技项目（5211DS17001G）
作者(Author):
王龙飞,华文,石博隆,王博文,周升彧,申屠磊璇,楼伯良
WANG Longfei,HUA Wen,SHI Bolong,WANG Bowen,ZHOU Shengyu,SHENTU Leixuan,LOU Boliang
DOI: 10.19585/j.zjdl.202008003
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