基于灵活虚拟惯性控制的直流充电桩协同控制

Collaborative control of DC charging piles based on flexible virtual inertia control

直流系统具有小惯性、弱阻尼特征,而直流充电桩系统的负载投切相对频繁,会对母线电压稳定产生较大的影响。采用灵活虚拟惯性控制技术作为一次控制,使直流充电桩系统具备一定的惯性与阻尼支撑,从而改善直流充电桩控制系统的动态性能;采用惯性中心协同控制策略作为二次控制,调整各充电桩系统的输入电能,并对虚拟参数进行二次调节,从而保障各系统能在不同的参数下实现电压响应的一致性;利用反推法重新构造电流内环,以弥补传统比例积分控制动态性能较弱的问题。仿真结果验证了所提控制策略的有效性。

The direct current(DC)system has the characteristics of small inertia and weak damping,and the load switching of DC charging pile system is relatively frequent,which will have a great influence on the voltage stability of buses.The flexible virtual inertia control technology is used as the primary control to make the DC charging pile system have certain inertia and damping support,so as to improve the dynamic performance of the DC charging pile control system.The collaborative control strategy of center of inertia is used as the secondary control to adjust the input electric energy of each charging pile system and make secondary adjustment to the virtual parameters,so as to ensure consistency of voltage response of each system under different parameters.The current inner loop is reconstructed by using the backstepping method to make up for the weak dynamic performance of the traditional proportion integration control.Simulative results verify the effectiveness of the proposed control strategy.