电网连接强度对交、直流混联系统静态电压稳定影响的研究

Research on Effect of Electrical Connection Strength on Quiescent Voltage Stability of AC/DC Hybrid System

为了研究交、直流混联系统中局部电网的电气连接强度对受端交流系统换流母线静态电压稳定性的影响,以南方电网作为研究模型,利用BPA(Bonneville Power Administration)软件进行受端交流系统电压稳定的实例仿真,对南方电网内部不同局部电网的电气连接强度对受端交流系统电压稳定的影响进行分析,得出结论:与直流并行的交流通道的线路电气长度是影响受端系统换流母线静态电压稳定的主要因素之一;与受端相距较远的送端电网和受端电网内部的交流电气连接强度对受端交流系统换流母线静态电压稳定影响不大;短路容量指标在评估受端系统交流母线的电压稳定性时存在缺陷,需要改进。

In order to investigate effect of electrical connection strength of partial power networks in AC/DC hybrid system on quiescent voltage stability of commutation buses in AC receiving-end system, the paper takes CSG as a research model and makes use of Bonneville Power Administration （BPA） software to simulate voltage stability of AC receiving-end system and analyze impact of electrical connection strength of various partial power grids of CSG on voltage stability of AC receivingend system. It draws conclusions like following： length of electric wiring paralleled with DC wiring is one of the major influencing factors of quiescent voltage stability of commutation buses in receiving-end system; AC electric connection strength in receiving-end and transmitting-end power networks afar from receiving-end has little effect on quiescent voltage stability of commutation buses in AC receiving-end system; there are disadvantages of short-circuit index in assessment on voltage stability of AC buses in receiving-end system, which need to be improved.