电压源型PWM整流器直流母线电压的消抖方法  

Approach to eliminate DC-link voltage pulsations of voltage-source PWM rectifier

作　　者：陈建生[1] 章玮[1] 徐海亮[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《机电工程》2012年第9期1085-1089,1099,共6页Journal of Mechanical & Electrical Engineering

摘　　要：直流母线电压的稳定性是PWM整流器的一个重要指标。在电网电压不平衡且(或)含有低次电力谐波时,传统的控制方法不能消除直流母线电压的抖动。为解决这一问题,首先深入分析了电网电压不平衡且含有5次、7次谐波分量对电压源型PWM整流器的直流母线电压稳定性的影响;进而提出了一种基于比例积分-谐振(PI-R)的控制策略,并详细分析了电流控制指令计算和PI-R控制器的设计方案。1 MW PWM整流器的仿真结果表明,所提出的控制策略能显著抑制直流母线电压的波动,并提高系统的安全运行性能。The stability of the DC-link voltage is a main target of the grid-connected PWM rectifier. When the grid voltage is unbalanced and （or）harmonically distorted, the conventional control strategy can＇t eliminate the pulsation of DC-link voltage. In order to solve this problem, Firstly, the effect of unbalanced and 5th and 7th harmonics to the VSR was analyzed;and then, an approach based on PI-R controller was proposed, with detail calculation of the current references and designation of current controller. Simulation results of a 1 MW VSR indicate that the proposed control strategy can significantly reduce the DC-link voltage pulsation, enhance the operation of the DC-link capacitor and the associated load safely.

关 键 词：电压源型PWM整流器 谐波畸变 比例积分-谐振控制器 直流母线电压 

分 类 号：TM712[电气工程—电力系统及自动化]