抑制多馈入直流输电系统相继换相失败的协调恢复控制策略  

Coordinated recovery strategy for inhibiting continuous commutation failures in multi-infeed HVDC transmission system

作　　者：王超[1] 李兴源[1] 冯明[1] 黄睿[1] 李妮[1] 洪潮[2] 

机构地区：[1]四川大学电气信息学院,成都610065 [2]中国南方电网有限责任公司电网技术研究中心,广州510080

出　　处：《电测与仪表》2016年第13期19-24,共6页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金重点项目(51037003);南方电网公司科技项目(K-KY2013-001)

摘　　要：针对多馈入直流系统容易出现的相继换相失败的问题,提出一种渐进恢复控制策略。为了确定各直流系统的恢复顺序,提出多馈入无功运行有效短路比(QMOESCR)指标,用来衡量直流系统受端电网强度和直流系统之间耦合程度的大小,并以此作为协调安排各直流系统故障后功率恢复速率的依据。然后,从改善交直流互联系统故障恢复特性的角度出发,对多回直流系统进行有序恢复,降低多回直流系统恢复过程中的无功需求,从而避免多回直流系统出现的相继换相失败,保证系统的安全稳定运行。分别对简单三馈入直流系统的电磁暂态仿真和南方电网机电暂态仿真的结果表明所提出的渐进协调恢复策略是有效的、可行的。A progressive and coordinated recovery control strategy is proposed for continuous commutation failures in multi-infeed HVDC transmission system. The index of Multi- Infeed Operating Effective Short Circuit Ratio considering reactive power which representing the strength of receiving AC system and the extent of coupling between different DC systems,is used as a criterion to determine the order of different DC systems. From the perspective of improving the recovery ability of AC / DC interconnected system,the sequential recovery strategy is employed for multi-circuit DC system to decrease the reactive requirement during the recovery process,so that the continuous commutation failure of multi-circuit DC system can be avoided,and the system can operate safely and stably. The proposed recovery control strategy is implemented on a simple tri-infeed DC system with electromagnetic transient simulation and China Southern Power Grid with electro-mechanical transient simulation,experiment results demonstrate the proposed approach is effective and feasible.

关 键 词：多馈入直流输电系统 换相失败 短路比 多回协调恢复 

分 类 号：TM721[电气工程—电力系统及自动化]