采用公共直流母线技术可以提高电能利用率和供电可靠性。但是，当直流母线上存在较大的纹波时，可能会导致线路寄生参数组成的网络发生谐振，不仅会影响直流母线的电能质量，严重时还会危及直流母线上连接的电气设备的安全运行。首先对直流母线的纹波分布规律及谐振机理进行分析。然后，提出基于直流有源滤波器(DC active power filter，DC-APF)的直流母线谐振抑制策略。最后，在MATLAB/Simulink仿真平台上搭建多逆变器共直流母线系统仿真模型，验证理论分析和所提方法的正确性。
Research on Resonance Suppression Method for Multi-Inverter Common DC Bus System
The use of the common DC bus technology can improve the power utilization rate and the reliability of power supply.However,when there are large ripples on the DC bus,it may cause resonance in the network composed of parasitic parameters of the line,which not only affects the power quality of the DC bus,but also seriously endangers the safe operaion of the electrical equipment connected to the DC bus.In this paper,the ripple distribution law and the mechanism of the DC bus were firstly analyzed.Then an active strategy based on DC active power filter(DC-APF)was proposed to suppress the DC bus resonance.Finally,a multi-inverter common DC bus system simulation model has been built in MATLAB/Simulink,the correctness of the theoretical and the proposed method was verified.
Common DC busParasitic parametersDC-APFResonance suppression
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