考虑电感寄生参数的有源前端LCL滤波器的设计

Design of active front end LCL filter considering inductance parasitics

针对作为变换器和电网的接口的LCL滤波器的谐振问题,对LCL滤波器的设计方法、网侧谐波的国际标准要求以及电感的寄生现象进行了研究,对电感的实际模型进行了建模及影响因素推导,提出了一种考虑电感寄生参数的5 k W有源前端的LCL滤波器设计方案,利用Matlab/Simulink软件对提出的LCL设计方案进行了仿真分析,将设计的模型与理想模型进行了波特图对比,从频域的角度论证了方案的有效性,并在软件上进行了电路仿真,从系统的角度验证了方案的可行性,最后搭建了基于Dspace的5 k W有源前端的实验平台,对方案进行了进一步的验证,依据实验及仿真估算结果提出了减小损耗的改进方案。研究结果表明,该方案能充分利用LCL滤波器电感的寄生电阻,实现较好的谐振抑制性能,同时将损耗控制在可接受的范围之内。

In order to solve the resonance problem of LCL filter,the design method of LCL filter and the parasitic phenomenon of inductance are studied. The actual model of inductor was modeled and the influencing factors were deduced. A design scheme of LCL filter with 5 k W active front-end was proposed. The proposed LCL design scheme was simulated by Matlab/Simulink,and the designed model was compared with the ideal model. Finally,the experimental platform of 5k W active front-end based on Dspace was built up,proving the feasibility of the scheme. The results show that this scheme can make full use of LCL filter inductor parasitic resistance to achieve better resonance suppression performance,while the loss control in the acceptable range.