基于虚拟惯性自适应算法的电动汽车控制策略

针对电动汽车双向DC/DC变换器,提出了一种虚拟惯性自适应控制策略。首先对电动汽车接入的交直流混合微电网的换流器采用虚拟同步发电机技术进行控制,以此提高微电网的频率稳定性。然后,对电动汽车双向DC/DC变换器采取虚拟惯性自适应控制,使其能够为直流网络的电压提供惯性支持,又可以在负荷出现波动时抑制直流电压变化过快,负荷波动消失时使电压迅速恢复至额定值。最后,在PSCAD/EMTDC中搭建含电动汽车的交直流混合微电网模型并进行测试。测试结果验证了所提控制算法的正确性与有效性。

Control strategy of electric vehicle based on virtual inertial adaptive algorithms

A virtual inertial adaptive control strategy is proposed for bidirectional DC/DC converters of electric vehicles. In order to improve the frequency stability of the microgrid, the converter of AC/DC hybrid microgrid connected by electric vehicles is controlled by the virtual synchronous generator technology. Then, the virtual inertia adaptive control is adopted for the electric vehicle bidirectional DC/DC converter, which can provide the inertia support for the voltage of the DC network. It can also restrain the DC voltage change too fast when the load fluctuates, and the voltage can be quickly restored to the rated value when the load fluctuation disappears. Finally, a AC/DC hybrid microgrid model containing electric vehicles is built and simulated in PSCAD/EMTDC. The simulation results verify the effectiveness of the proposed control algorithm. This work is supported by National Natural Science Foundation of China (No. 51507050) and Science and Technology Project of Jiangsu Electric Power Company (No. J2017025).