摘要
提出了采用LCL拓扑的滤波器来减少PWM调制导致的交流电流中的高次谐波的方案,对LCL滤波的三相电压型PWM整流器电路拓扑进行了分析,给出了LCL滤波器及LCL滤波的三相电压型PWM整流器的数学模型。采用了电压电流双闭环控制策略,对电压电流环的设计作了介绍。为了提高系统的稳定性,采取了电容串联电阻的方式。仿真结果表明,LCL滤波的整流器要比纯电感滤波器在滤除高次谐波方面效果好得多。仿真结果验证理论分析的正确性。
To reduce the current harmonics around the switching frequency of three phase PWM rectifier, this paper proposes a LCL-filter; and the topology of PWM with LCL filter is analyzed. Moreover the mathematical model of LCL-filter and rectifier with a LCL-fiher has also been derived. Amplitude frequency response characteristics of function of AC current and modulating voltage are compared when L-fileter and LCL-filter are used separately. In order to improve stability of system, a damping resistor in series with the filter capacitor is used. The control strategy of double loops is adopted, and current and Voltage controller design are presented. Finally theoretical results of the analysis are verified using Simulink in Matlab.
出处
《可再生能源》
CAS
2007年第5期71-74,共4页
Renewable Energy Resources
基金
国家高技术研究发展(863)计划子项目(2003AA512022-2)。
