结合频率预测的虚拟同步发电机自适应参数控制策略

Adaptive parameter control strategy of virtual synchronous generator based on frequency prediction

在基于虚拟同步发电机的逆变器控制模块中加入频率预测环节,得到系统受扰动后频率的最低或最高值.基于预测频率极限值,在满足储能释放最大容量不变和逆变器输出功率不超过额定容量的前提下,利用逆变器参数可实时调节的优势,增大虚拟转动惯量和阻尼系数的整定区间.结合更灵活的参数取值方法,提出转动惯量和阻尼系数协调控制策略,从而改善受扰动后系统频率和输出功率的恢复效果.根据二阶系统响应指标要求,给出参数整定方法.最后,利用Matlab/Simulink仿真,在孤岛和并网模式下验证所提控制策略的有效性.

The frequency prediction module is added to the inverter control module based on the virtual synchronous generator(VSG)to obtain the lowest or highest of the frequency after the system is disturbed.Combined with the predicted maximum frequency,under the premise that the maximum capacity of the energy storage release is unchanged and the output power of the inverter does not exceed the rated capacity,the advantage of the inverter parameters can be adjusted in real time,the setting range of the virtual rotor inertia and damping coefficient is increased.A coordinated control strategy of rotor inertia and damping coefficient is proposed to improve the recovery of system frequency and output power.According to the requirements of the second-order system response index,the parameter setting method is given.Finally,Matlab/Simulink simulation is used to verify the effectiveness of the proposed control strategy.