考虑多直流无功交互影响的换相失败预防协调控制方法  

Coordinated Control Method for Commutation Failure Prevention Considering Reactive Power Interaction Among Multiple HVDC Systems

作　　者：郑晨一 汤奕[1] ZHENG Chenyi;TANG Yi(School of Electrical Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学电气工程学院,江苏省南京市210096

出　　处：《电力系统自动化》2023年第4期102-110,共9页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51877037)。

摘　　要：换相失败预防(CFPREV)在抑制换相失败的同时会增大直流系统的无功消耗。换流站之间存在无功交互影响,这一固有特性削弱了CFPREV在多馈入直流系统中的有效性和适用性,甚至可能导致多直流连锁换相失败。针对CFPREV的局限性,提出了抑制多直流连锁换相失败的协调控制方法。首先,提出了反映多直流实时换相电压状态的综合指标。然后,将多直流实时换相电压状态引入原有控制策略,考虑无功交互影响对CFPREV进行协调控制。基于PSCAD/EMTDC的仿真结果表明所提方法能够有效抑制多直流连锁换相失败。The commutation failure prevention(CFPREV) would increase the reactive power consumed by the high voltage direct current(HVDC) system when it is triggered for commutation failure mitigation. There is a reactive power interaction between converter stations. The above inherent characteristic weakens the effectiveness and applicability of CFPREV in the multi-infeed HVDC system, which may even cause the cascading commutation failures among multiple HVDC systems. To overcome the limitation of CFPREV, a coordinated control method is proposed for the mitigation of cascading commutation failures of multple HVDC systems. First, a comprehensive index that represents the real-time commutation voltage states of multiple HVDC systems is presented. Then, the real-time commutation voltage states of multiple HVDC systems are introduced into the original control strategy to coordinate and control CFPREV with consideration of the reactive power interaction. Simulation results based on PSCAD/EMTDC show that the cascading commutation failure among multiple HVDC systems can be effectively mitigated by the proposed method.

关 键 词：高压直流输电 换相失败 提前触发 无功交互 协调控制 多馈入直流系统 

分 类 号：TM721.1[电气工程—电力系统及自动化]