摘要
为了减少PWM整流器开关频率附近高次谐波的含量,采用三次LCL滤波器。但考虑到LCL滤波器存在谐振问题,如果控制策略不合适会导致系统不稳定,且增大输入电网电流的谐波畸变率,提出基于虚拟电阻思想的控制策略。采用控制算法取代阻尼电阻的作用,增加系统的稳定性。此外对LCL滤波的三相电压型PWM整流器的完全和低频数学模型进行了详细分析,并对控制器的设计提出了理论指导。最后的仿真结果证明所提出的控制策略正确可行。
To reduce the current harmonics around switching frequency of the three-phase pulsewidth modulation （PWM） rectifiers, a LCL filter is adopted. However such solution can cause stability problems if controlling strategy isn＇t good. In order to assure stable operation of system, in this paper a controlling strategy based on virtual resistor concept is presented to make controlling arithmetic replacing function of damping resistor. Moreover low frequency and complete mathematical model of three-phase PWM rectifier are analyzed respectively. Design of controller is also introduced. The results of simulation using Matlab show the validity of the proposed method.
出处
《电工技术学报》
EI
CSCD
北大核心
2007年第2期74-77,共4页
Transactions of China Electrotechnical Society
基金
国家高技术研究发展计划(863计划)资助子项目(2003AA5l2O22.2)
