换相序技术应用于稳定控制的条件及最优控制策略

doi:10.19595/j.cnki.1000-6753.tces.200457

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摘要换相序技术是电力系统稳定控制的一种方案。在电力系统即将失稳的情况下,利用电力电子开关迅速进行相序切换,发电机侧ABC相换相序连接至系统侧cab相,进而使系统功角减小2π/3,达到控制稳定的目的。基于能量函数法,分析换相序前后总能量的突变机理,得到换相序瞬间的能量变化量;在此基础上推导换相序技术的应用条件,通过换相序前后系统稳定性判断,给出换相序后系统稳定裕度增量,量化分析换相序技术提高系统暂态稳定性的程度,并以此为依据提出换相序技术的最优控制策略。基于Matlab的仿真结果表明,换相序最优控制策略能够实现稳定控制的最优效果,获得最大稳定裕度,并验证了应用条件的正确性。

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	黄少锋
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关键词 ：换相序技术, 稳定控制, 能量函数分析, 暂态稳定性, 应用条件, 最优控制策略

Abstract：Phase sequence exchange technology (PSET) is a scheme of power system stability control. When the system is about to lose stability, the phase sequence is quickly exchanged by the power electronic switch. The ABC phase of generator side is disconnected and then connected to cab phase of system side correspondingly, thereby reducing the power angle by 2π/3 and achieving the purpose of stability control. Based on the energy function method, the mutation mechanism of total energy before and after phase sequence exchanging was analyzed and the mutational energy at the instant of phase sequence exchanging was obtained. On this basis, the application condition of PSET was derived. By judging the system stability before and after phase sequence exchanging, the stability margin increment after phase sequence exchanging was given, thus analyzing the degree of improving the power system transient stability by PSET quantitatively. Based on this, the optimal control strategy of PSET was proposed. Finally, simulation results based on Matlab show that the optimal control strategy of PSET can achieve the optimal effect of stable control and obtain the maximum stability margin. Besides, the correctness of application condition is verified.

Key words： Phase sequence exchange technology stability control energy function analysis transient stability application condition optimal control strategy

收稿日期: 2020-05-07

PACS:

TM712

基金资助:中央高校基本科研业务费资助项目（2019QN107）

通讯作者: 李慧女,1994年生,博士研究生,研究方向为电力系统稳定与控制。E-mail：student089@163.com

作者简介: 黄少锋男,1958年生,教授,博士生导师,研究方向为电力系统继电保护。E-mail：huangsf@sf-auto.com

引用本文:

黄少锋, 李慧, 李轶凡, 张月品. 换相序技术应用于稳定控制的条件及最优控制策略[J]. 电工技术学报, 2021, 36(11): 2245-2254. Huang Shaofeng, Li Hui, Li Yifan, Zhang Yuepin. The Condition of Phase Sequence Exchange Technology Applied to Stability Control and Optimal Control Strategy. Transactions of China Electrotechnical Society, 2021, 36(11): 2245-2254.

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