Active damping LCL滤波器在三相并网型逆变器中的设计与实现

摘要

探讨了基于虚拟电阻概念的active damping LCL滤波器的实现.参照passive damping LCL滤波器稳定性分析结果,用待定系数法求出虚拟电阻的计算公式.在系统框图中通过引入虚拟电阻改变控制算法,抑制了LCL电路中谐振现象的产生,克服了passive damping LCL滤波器的缺点,实验结果验证了该方法的可行性.%The realization of active damping LCL filter according to the concept of virtual resistor is discussed in this paper. In contrast to the analysis results of stabilization of passive damping LCL filter, computational formula of virtual resistor is obtained using undetermined coefficient method. Control algorithm is modified through the introduction of virtual resistor in system chart, resonance phenomenon is eliminated in LCL circuit, the defects of passive damping LCL filter are overcome. Experiment results demonstrate the feasibility of this method.