For at the DC electric energy router in the MVDC distribution network,there are some issues when renewable energy sources fluctuate. Under these conditions,the traditional control strategy has a general control effect on the DC bus and the voltage is easy to violate. Based on the modular input-series-output-parallel (ISOP) type topology,a DC electric energy router control strategy combining the input voltage sharing and virtual DC machine is proposed. First,the power balancing control characteristics between the modules in the input voltage sharing control process are studied and compared with the output current sharing control;then,the virtual DC machine control is applied to the control algorithm so that the converter can simulate the inertia characteristics of DC machine;then,a small signal model of the virtual DC machine is established to analyze its working principle and the influence of parameters on the system. Finally,a simulation model is built in MATLAB/Simulink for verification. The results show that the proposed control strategy can achieve power balancing among the modules of the DC electric energy router while having inertia characteristics and damping characteristics similar to the DC machine,which can significantly improve the DC bus voltage stability of the DC distribution network.
关键词
直流电能路由器/直流配电网/输入均压/虚拟直流电机/直流母线电压
Key words
DC electric energy router/DC distribution network/input voltage sharing/virtual DC machine/DC bus voltage
维普
万方数据