不平衡电网电压下柔性直流输电系统控制策略研究  

Research of control strategy for VSC-HVDC system under unbalanced grid voltage condition

作　　者：孙博[1] 张建文[1] 潘磊落[1] 韩刚[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221116

出　　处：《工矿自动化》2013年第10期68-72,共5页Journal Of Mine Automation

基　　金：中央高校基本科研业务费专项资金资助项目(2012QNA10)

摘　　要：针对不平衡电网电压下柔性直流输电系统直流侧和交流侧产生的谐波及功率波动问题,在建立正负双d-q坐标系下电压源换流器数学模型的基础上,采用基于正负序电网电压分别定向的双dq-PI控制策略,抑制直流侧2次谐波及交流侧有功功率波动;针对传统相序分解慢从而影响控制系统动态性能和带宽的问题,采用一种快速的相序分解方法。仿真结果表明,与传统控制策略相比,双dq-PI控制策略能较好地抑制直流电压及交流电流的波动。In view of problems of harmonic and power fluctuation of DC and AC side of VSC-HVDC system under unbalanced grid voltage condition, the paper used dual dq-PI control strategy with respective direction of positive and negative sequence components of grid voltage to inhibit the second harmonic of DC side and active power fluctuation of AC side based on establishing mathematical model of VSC in positive and negative d-q coordinate. In view of problem that traditional phase sequence decomposition is too slow, so as to influence dynamic performance and band width of the control system, it used a rapid phase sequence decomposition method. The simulation result shows that the dual dq-PI control strategy can inhibit fluctuation of DC voltage and AC current comparing with the traditional control strategy

关 键 词：高压直流输电 柔性直流输电 不平衡电网电压 电压源换流器 谐波 功率波动 双dq-PI控 制策略 相序分解 

分 类 号：TD612[矿业工程—矿山机电]