基于电流前馈的储能飞轮充放电功率控制

Charging-Discharging Power Control of Energy Storage Flywheel Based on Current Feedforward

基于电网调频对储能飞轮输出功率的要求,建立了飞轮永磁同步电机的数学模型,通过电网侧储能变流器来提供稳定的直流母线电压,电机侧变流器采用功率/转速外环与电流内环的双闭环控制策略,实现飞轮恒功率充放电。针对输出频率波动,响应速度慢的问题,提出基于电流前馈的功率环控制方法,并对转速环做出改进。通过实验验证,飞轮系统能快速跟踪充放电功率指令,稳态时的功率输出稳定,该方法现实可行。

Based on the demand of power plant frequency regulation,the mathematical model of the energy storage flywheel permanent magnet synchronous motor was established,the stable DC bus voltage was provided by the grid-side power conversion system,the control of motor-side converter was based on the outer power/speed loop cascaded with the internal current loop,so the flywheel could charge and discharge on the command power.Aiming at the problems of output frequency fluctuation and insufficient stability,the current feedforward control was added to the power loop,and the speed loop was improved.It was verified by experiments that the flywheel system could track the charging and discharging power command in time,and the power output in steady state was stable,thus the method is feasible.