混合型多APF系统建模及共振抑制方案研究

针对多台APF系统相关的共振和稳定性问题,建立了常规混合多APF系统的数学模型。基于该模型进行了其动态交互的数学理论分析,提出了一种针对混合多APF系统削弱共振和提高系统稳定性的方案。其中多APF系统是由不同类型的模块APF组成,每种模块具有不同的LCL滤波器参数、开关频率、载流量。在分析混合型多APF的动态交互的基础上,得出了增加LCL滤波器电感可有效抑制不同模块APF之间的共振和耦合的结论。与目前传统模块化APF相比,该混合型多APF系统可提供较宽的电流跟踪带宽、快速的动态响应速度以及较高的容量利用率。同时理论研究和仿真结果证明了该混合型多APF系统的共振抑制方案的可行性。

Study on modeling of a hybrid multi-APFs system and resonance suppression scheme

To address the resonance and stability issues associated with a multi-APFs system, a mathematical model of the conventional hybrid multi-APFs system is established. Based on the model, a mathematical theory and dynamic interaction analysis are developed. A scheme for weakening resonance and improving system stability for the hybrid modular APF system is proposed. The multi-APFs system is composed of different types of modular APF. Each module has different LCL filter parameters, switching frequency, and current carrying capacity. Based on the analysis of the dynamic interaction of the hybrid multi-APFs, it is concluded that increasing the output filter inductance can effectively suppress the resonance and coupling between the APFs of different modules. Compared with the current traditional modular APF, the hybrid multi-APFs system can provide a wider current tracking bandwidth, a fast dynamic response speed, and higher capacity utilization. At the same time, theory and simulation results prove the feasibility of the resonance suppression scheme. This work is supported by the National Natural Science Foundation of China (No. 61863023).