摘要
为了减少多馈入直流系统中多直流同时换相失败的发生,提出了考虑降低多馈入直流换相失败风险的无功补偿配置方法,对动态无功补偿装置的类型、布点和容量进行优化。该方法首先计算了系统的节点阻抗矩阵,以直流距离耦合度指标来识别无功补偿的薄弱区域和关键故障集合;然后通过时域仿真求解换相失败风险降低效果指标和灵敏度指标确定动态无功补偿装置的候选安装节点;建立降低直流换相失败风险的动态无功配置优化模型,并通过基于分解的多目标进化算法（MOEA/D）求其Pareto最优解集;最后利用熵权法计算各方案的贴近度,确定各方案的相对优劣,为决策人员提供决策依据。实际电网的算例结果表明：通过同时优化多个动态无功补偿装置的类型、布点和容量,能更好地降低多馈入直流同时换相失败的风险。研究结果可以为多馈入直流系统的动态无功补偿优化提供参考。
In order to prevent behaviors of simultaneous commutation failure in the multi-infeed DC system, we proposed a dynamic VAR configuration method for reducing the risk of DC commutation failure to optimize the type, location and capacity of the dynamic reactive power compensation device. Firstly, the impedance matrix of the system nodes and the DC distance coupling index were calculated to identify the weak areas of reactive power compensation and the set of critical faults. The index of commutation failure duration shortening effect and the sensitivity index were calculated by time domain simulation. Therefore, the candidate nodes could be selected based on these indexes. Seocndly, after establishing the reactive power allocation optimization model of reducing the risk of DC commutation failure, we could obtain the Pareto optimal solution set by the MOEA/D. Finally, the close degrees of every decision schemes were calculated by the entropy weight method. And based on the calculation results, the relative superiorities of decision schemes were assessed which can help the operators to choose the effective compromise solutions. Calculation results of actual power grid show that the risk of simultaneous commutation failure of multi-infeed HVDC can be better reduced by simultaneously optimizing the type, location and capacity of the dynamic reactive power compensation devices. The results provide references for dynamic reactive power compensation of the multi-infeed DC system.
作者
周仕豪
唐飞
刘涤尘
张谦
王少辉
殷巧玲
ZHOU Shihao;TANG Fei;LIU Dichen;ZHANG Qian;WANG Shaohui;YIN Qiaoling(School of Electrical Engineering,Wuhan University,Wuhan 430072,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第10期3258-3265,共8页
High Voltage Engineering
基金
国家电网公司科技项目(特高压直流连续换相失败、再启动工况下安全稳定控制技术研究)(SGTYHT/15-JS-191)~~
关键词
特高压直流
换相失败
动态无功优化
电气距离
熵权法
UHVDC
commutation failure
dynamic reactive power optimization
electrical distance
entropy weight
