三相逆变电源在不平衡负载条件下的控制研究  

Research into Control Method of Three-phase Inverter Power Supply Under Unbalanced Load

作　　者：徐顺刚[1] 

机构地区：[1]重庆师范大学物理学与信息技术学院,重庆400047

出　　处：《重庆师范大学学报（自然科学版）》2009年第2期103-107,共5页Journal of Chongqing Normal University:Natural Science

摘　　要：三相输出电压对称是对三相逆变电源的重要要求之一,在三相逆变电源中,输出电压不对称主要是由于三相负载的不平衡引起的。本文基于对称分量法和叠加原理对三相逆变电源在不平衡负载下产生三相输出电压不对称的机理进行了系统的分析,得到了输出电压正、负、零序分量不同的补偿特性。设计了一个简单可行的同步正负序参考系控制器,有效地补偿了不平衡负载引起的逆变电源输出电压畸变,保证了逆变电源在任意不平衡负载下均能维持三相平衡的输出电压。论文最后通过Matlab仿真结果验证了理论分析和所提出的控制方法的正确性。In the three phase inverters power supply system, asymmetry of the output voltage may lead to local overload of the inverter and impair the reliability of the power supply system. To maintain symmetric three phase output voltage is one of the most important duties of the inverter, and asymmetry of the output voltage is mainly caused by unbalanced loads in the power supply system. To solve this problem, the mechanism of asymmetric output voltage of the three phase inverter under unbalanced loads is analyzed based on symmetrical component decomposing and the superimpose theory. Analysis shows that positive-sequence, negative-sequence and zero- sequence components of the output voltage have different effects on the performance of compensation, and a simple and feasible synchronous positive-sequence negative-sequence reference system controller is here proposed. It can effectively compensate the output voltage distortion of the three phase inverter under the unbalanced loads, thus symmetric output voltages of the three phase inverter under unbalanced load can be ensured. Matlab simulation is performed to verify the theoretical analysis results of the proposed control method.

关 键 词：三相逆变器 不平衡负载 电压对称性 

分 类 号：TM401.1[电气工程—电器]