电网电压不平衡下三相VSR的优化控制策略  

The Optimal Control Method of Three-Phase VSR under Unbalance Grid Voltage

作　　者：杜翠静[1] 常万仓[2] 李占胜[1] 

机构地区：[1]河北能源职业技术学院,河北唐山063000 [2]新华水利水电投资公司,北京100053

出　　处：《电气开关》2012年第2期20-23,49,共4页Electric Switchgear

摘　　要：电网电压不平衡时,以电网平衡为约束所设计的三相电压型PWM整流器(VSR)会出现不正常的运行状态。其交流侧将产生负序电流,使网侧电流严重不对称。提出了基于同步旋转坐标系的三维复空间瞬时功率定义方法,适合于三相VSR不平衡控制和功率分析。同时在此基础上提出抑制交流侧负序电流的控制策略,最后进行了系统仿真。结果表明,该控制策略改善了三相VSR的网侧电流波形,实现三相VSR在电网不平衡下的正常运行。When the electric network voltage is unbalance, the three-phase voltage type PWM rectifier （VSR）that is bound by electric network design will not be normal in operation. Its alternating current side will produce a negative se- quence current, making the network current seriously asymmetric. A three-dimensional complex space instantaneous pow- er definition method based on synchronous rotary coordinate system is given, which is suitable for three-phase VSR unbal- anced control and power analysis. Meantime, a control method of the negative current of controlling alternating current side is proposed on the basis of this. Finally, the system simulation is carried out. The result shows that the control method has improved the network side current wave forms of three-phase VSR in the electric network unbalance. VSR and has achieved normal operation of three-phase

关 键 词：不平衡电网 三相VSR 三维复空间瞬时功率 负序电流 

分 类 号：TM71[电气工程—电力系统及自动化]