摘要
大型互联电网若缺乏充足的动态无功支撑将面临严重暂态电压失稳现象,在输电系统的关键位置安装快速可控的无功补偿装置将有效抑制这一现象。重点研究了电网故障下动态无功补偿装置SVC和链式STATCOM的暂态电压支撑能力以及暂稳极限提高能力。针对链式STATCOM的独特结构,提出了一种改进分相控制策略。基于Matlab/Simulink搭建了系统仿真模型,仿真结果证实故障下链式STATCOM的暂态电压支撑能力略高于SVC,暂稳极限提升能力明显优于SVC,同时验证了改进分相控制策略可确保不对称故障期间链式STATCOM对系统的暂态支撑作用正常发挥。
Large scale interconnected power system will front the transient voltage stability problem once lacking adequate dynamic VAR compensation. In this paper, a comparison is made for the transient voltage support capability and transient limits improve capability of SVC and cascade STATCOM, and the main factors influencing the capability also in-depth discussed. A newly improved control strategy is presented, which ensures the transient volt- age support capability of cascade STATCOM even under asymmetric grid faults. Based on Matlab/Simulink build a system simulation model, simulation results verify that the transient support ability of cascade STATCOM is slightly better than that of SVC, but much better in the transient limits improve aspects, and meanwhile validate the validity of the improved control strategy.
出处
《电力科学与工程》
2012年第8期30-35,共6页
Electric Power Science and Engineering
基金
国家自然科学基金资助项目(50977028)
