不平衡负载条件下三相四桥臂逆变器的控制  

The Control of Three-Phase Four-Bridge Arm Inverter under the Unbalanced Load Conditions

作　　者：费兰玲[1] 张凯[1] 蔡院玲[1] 

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

出　　处：《通信电源技术》2011年第3期4-8,13,共6页Telecom Power Technology

摘　　要：三相四桥臂逆变器具备外接三相不平衡负载的能力。为改善逆变器系统在严重不平衡负载情况下输出电压的对称性,文中提出一种新颖的控制策略——旋转坐标系下的PIR-P双环控制。当系统接不平衡负载时,电压外环的PI控制器保证系统的动态性能,谐振控制器保证其稳态精度。最后在旋转坐标系下对系统分别采用PI-P和PIR-P两种双闭环控制器情形作对比仿真。结果表明系统在严重不平衡负载情况下,输出电压负序不平衡度由2.41%减小到0.129%,零序不平衡度由2.25%减小到0.032%。The function of external unbalanced load is contained in three-phase four-bridge arm inverter.This paper presents a new method that PIR-P dual loop control based on rotating coordinates to improve the output voltage symmetry of inverter under the serious unbalanced load condition.When the inverter system＇s load is serious imbalance,this method can improve the symmetry of output voltage.In that unbalanced case,the dynamic property of the system can be kept by PI controller of outer voltage loop and the accuracy of steady-state can be kept by resonance controller.Then comparison and simulation both of PI-P and PIR-P dual close loop controller are taken under rotating coordinates,then the result shows that the degree of negative sequence unbalance of output voltage reduces from the 2.41 % to 0.129 %,and the zero-sequence unbalance can be reduced from 2.25 % to 0.032 %.

关 键 词：三相四桥臂逆变器 不平衡负载 谐振控制 

分 类 号：TM464[电气工程—电器]