多馈入直流系统换流母线动态电压稳定性分析  

Analysis on Dynamic Voltage Stability at Commutation Buses of Multi-infeed HVDC Transmission System

作　　者：井艳清[1] 王淼[1] 

机构地区：[1]国核电力规划设计研究院,北京100095

出　　处：《四川电力技术》2014年第4期23-26,共4页Sichuan Electric Power Technology

摘　　要：直流输电系统中换流器运行时消耗大量的无功功率,致使逆变侧的电压稳定问题最为突出,若所联交流系统强度较弱,则电压稳定问题更为严重。近年来,国内直流输电系统陆续投产,直流系统间的相互作用使得多馈入直流系统的电压稳定性更为复杂,仅研究单条直流系统的电压稳定性已无法满足工程实际需求。以两馈入直流系统模型为例,研究换流母线补偿的无功大小、直流间耦合程度、以及多馈入短路比大小对多馈入直流系统换流母线电压稳定性的影响。NETOMAC仿真结果表明,在多馈入直流系统中,在一定范围内增大换流母线无功功率补偿、减小直流系统间电气距离、增大所联系统多馈入短路比均对动态电压稳定有利。Converters of HVDC transmission system consume a large amount of reactive power , so that the voltage stability problem in inverter side is most prominent , if the coupling strength of AC system is weak , the voltage stability problem is more serious.In recent years , DC transmission system has been gradually put into operation in China ,and the interactions between DC systems make the voltage stability of multi -infeed DC system more complex , so studying the voltage stability only in sin-gle DC system cannot meet the actual needs of the project .Taking the model of two -infeed HVDC transmission system for ex-ample, the impacts of reactive power compensation , degree of coupling between direct currents and multi -infeed short-cir-cuit ratio on the voltage stability of multi -infeed HVDC system are studied .NETOMAC simulation results show that for multi-infeed HVDC transmission system the voltage stability can be improved by appropriately increasing the compensation of reac -tive power at commutation buses , reducing the electrical distance between HVDC systems and increasing multi -infeed short-circuit ratio of the connected HVDC system .

关 键 词：多馈入直流输电系统 动态电压稳定 直流系统间电气距离 电压稳定临界点 多馈入短路比 

分 类 号：TM712[电气工程—电力系统及自动化]