电网电压不平衡下三相VSR的优化控制策略  

A optimal control method for VSR under the unbalanced source voltage

作　　者：杜翠静[1] 常万仓[2] 

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

出　　处：《机床电器》2012年第2期44-46,49,共4页Machine Tool Electric Apparatus

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。本文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。In unbalanced power system, the balance to be bound by the grid design of three - phase voltage - type PWM rectifier （VSR） will not be running normal. AC will have a negative sequence current, so severe asymmetric current network side. The thesis gives out a new three - dimension complex space power definition based on the synchronous rotating coordinate i is suitable for the VSR control and the power analysis of the unbalanced case. At the same time, on this basis it was proposed that AC suppression of negative sequence current control strategy. Finally, the system simulation results demonstrate the control strategy in the network side current waveform of the Three - phase VSR can be improved. Three - phase VSR implements the normal operation in unbalanced power system.

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：TM133[电气工程—电工理论与新技术]