一种新的不平衡控制策略的研究  

Research on a Novel Control Strategy for Unbalanced Load

作　　者：胡文华[1,2] 马伟明[3] 刘春喜[4] 

机构地区：[1]华中科技大学电气与电子工程学院,湖北武汉430074 [2]华东交通大学电气与电子工程学院,江西南昌330013 [3]海军工程大学电力电子技术研究所,湖北武汉430033 [4]浙江大学电气工程学院,浙江杭州310027

出　　处：《电气传动》2009年第10期3-7,30,共6页Electric Drive

基　　金：国家自然基金资助项目(50607020)和(50737004);国家自然科学基金委员会创新研究群体科学基金(50721063)

摘　　要：三相逆变器的一个重要的性能是在三相负载不平衡时仍能维持三相输出电压的对称性。传统的对称分量法与叠加原理虽然能在三相逆变器带不平衡负载时通过对输出电压正、负、零序分量的不同补偿来维持三相电压的平衡,但该方法运算量大,适时性差,不宜控制。针对大容量中频400 Hz逆变电源,提出了一种新的不平衡控制策略,即谐振控制器的控制方法。该方法可以使逆变器在带不平衡负载时仍能维持三相输出电压的平衡,并能同时应用于三相三线制和三相四线制系统。推导了它的两种实现方式。仿真结果验证了该方法能有效地抑制由不平衡负载引起的输出电压畸变,获得高质量的输出电压波形。One of the important functions of three-phase inverter is to maintain the symmetric three-phase output voltage when the three-phase loads are unbalanced. Although the traditional symmetrical component decomposing and superimpose theory can keep the voltage balance through compensating the positive-sequence, negative-sequence and zero-sequence components of output voltage, however, this method is time-consuming and not suitable for control. Aiming at high power middle frequency 400 Hz inverter source, a P＋Resonant controller which ensured a balanced three phase output voltage under unbalanced load was proposed. The regulator is proved to be applicable to both three-phase three-wire system and three-phase four-wire system and developed two methods of realization. The simulation results verify that this method can suppress effectively the output voltage distorted caused by the unbalanced load and attained a high quality voltage waveforms.

关 键 词：三相逆变器 不平衡负载 电压对称性 谐振控制器 

分 类 号：TM464[电气工程—电器]