Virtual DC motor(VDCM) control has been widely applied in suppressing the power fluctuations of DC mi-crogrid and improving the voltage stability of DC bus. Due to the randomness and uncertainty of distributed generations in microgrid,as well as the load switching in microgrid,the DC bus voltage will fluctuate greatly. To improve the regula-tion capability of bus voltage,a virtual energy storage control strategy based on the coordination of VDCM control and controllable load is proposed by using the regulation capability of controllable load and the virtual motor control of load converter. By adjusting the angular speed of the virtual motor,the power consumption of the controllable load can be ad-justed to compensate the fluctuation of bus power and improve the stability of bus voltage. In addition,the relationship between the rotational kinetic energy of VDCM and the charging and discharging energy of the DC capacitor is estab-lished. Finally,a simulation model is built on the MATLAB/Simulink platform to verify the effectiveness of the proposed control strategy.
关键词
直流微电网/虚拟直流电机/直流变换器/虚拟储能/仿真分析
Key words
DC microgrid/virtual DC motor(VDCM)/DC converter/virtual energy storage/simulation analysis
维普
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