基于dq变换的三相电压暂降生成方法  

Method of Three-Phase Voltage Sag Forming Based on dq Transformation

作　　者：张波[1] 颜湘武[1] 王树岐[1] 

机构地区：[1]华北电力大学电气与电子工程学院,保定071003

出　　处：《电工技术学报》2011年第10期55-61,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50977027);河北省自然科学基金(E2009001400);华北电力大学科研基金(932010903;932010907)资助项目

摘　　要：提出了一种基于dq变换的三相电压暂降生成方法。采用"背靠背"(Back to Back)双电压型PWM变流器构成三相电压暂降发生器的主电路,模拟无穷大电网在正常和各种故障情形下的电源特性。针对七种典型的电压暂降故障(包括对称、不对称不含零序以及不对称含零序三种情形下的所有电压暂降类型),在dq0同步旋转坐标系下应用对称分量法完成复合运算,并针对不对称含零序电压暂降情况对abc-dq0变换进行了算法修正,生成电压暂降的空间矢量脉宽调制控制信号。该方法生成的三相故障暂降电压自动满足相与相之间的相位关系和幅值关系,可以全面准确地生成公共连接点的故障电压,实现了电压跌落深度的全范围可调以及故障持续时间的任意设置。仿真和部分实验结果验证了该方法的合理性与可行性。In this paper,a method of three-phase voltage sag forming based on dq transformation is proposed.With the ＇back to back＇ linked two PWM voltage-source converters,normal and fault state of infinite grid is simulated.Aiming at seven typical of voltage sag fault（including all the voltage sag types in symmetric,asymmetric excluding zero-sequence and asymmetric containing zero-sequence circumstances）,compound operation is completed in synchronous rotational axes dq0 under symmetrical component method applied.Especially,abc-dq0 transformation is amended for asymmetric containing zero-sequence voltage sag situation.So the space vector pulse width modulation（SVPWM） control signal is generated.Three-phase voltage sag generated with this method could satisfy the phase relationship and amplitude relationship of the inter-phase automatically.As a result,point of common connection（PCC） fault voltage could be accurately generated.And the full scope of the depth of voltage dips adjustable and fault duration of any settings are realized.Simulation and part of experiment results show the rationality and validity of the method proposed in this paper.

关 键 词：dq变换 电压型变流器 电压暂降 电压暂降发生器 

分 类 号：TM713[电气工程—电力系统及自动化]