交直流并联系统的换流母线电压稳定性分析  

Analysis on Voltage Stability at Commutation Buses of Parallel AC/DC Power Systems

作　　者：徐梅梅[1] 李兴源[1] 白加林[2] 贺洋[1] 刘建[1] 

机构地区：[1]四川大学电气信息学院,四川省成都市610065 [2]上海交通大学电子信息与电气工程学院,上海市200240

出　　处：《电力系统自动化》2009年第7期6-10,26,共6页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划(973计划)资助项目(2004CB217907);国家科技支撑计划资助项目(2008BAA13B01)~~

摘　　要：随着中国交直流互联电网的发展,迫切需要研究换流母线的电压稳定问题。文中首先给出了交直流并联系统的简单模型,在此基础上介绍了并联交流系统强度指标以及负荷裕度曲线和电压稳定临界曲线。然后以两区域四机交直流混合系统为例,根据负荷导纳模型算法准确求取节点的功率裕度,采用上述2种曲线分析方法详细讨论并联交流系统强度和受端系统等值阻抗对逆变站换流母线电压稳定性的影响。最后对比分析了不同直流系统稳态控制方式下换流母线的负荷裕度,研究结果表明受端为弱交流系统时,采用整流侧定电流—逆变侧定电压的控制方式将有利于提高系统稳定性。With the development of Chinese AC/DC power grid, the voltage stability of commutation bus is urgent to be researched. Firstly, the simple model of AC/DC parallel system is given, and then based on this model the AC system strength index is introduced as well as the load margin graph and voltage stability critical graph. Taking example for the modified two- area and four-generator power system, this paper accurately calculates the node power margin according to the load admittance model algorithm, and discusses the influence of parallel AC system strength and equivalent impedance of receiver system on voltage stability at inverter commutation buses. Finally, through the comparative analysis of load margins under different HVDC steady control modes, it is shown that when the receiver AC system is weak, the control mode of constant DC current at rectifier and constant DC voltage at inverter side will be propitious to improve the system stability.

关 键 词：并联交流系统强度 受端系统等值阻抗 直流系统控制方式 负荷裕度 电压稳定性 交直流并联系统 

分 类 号：TM712[电气工程—电力系统及自动化]