双馈风力发电系统的灵活虚拟同步发电机控制策略研究

基于恒参数虚拟同步发电机(VSG)控制策略的双馈风电机组(DFIG),在功率指令值突变的情况下,存在系统变化过快、功率振荡过大的问题。针对上述问题,该文提出基于指数型函数的灵活虚拟同步机(EFVSG)控制策略的DFIG(DFIG-EFVSG)以提升风电并网系统频率的稳定性。首先,建立DFIG与VSG控制策略的数学模型。然后,详尽分析转动惯量、阻尼系数与DFIG-EFVSG的风电并网系统频率之间相对应的关系。最后,仿真结果验证指数型EFVSG控制策略的有效性及优越性。

Doubly-fed wind turbine generator(DFIG) based on constant parameter virtual synchronous generator(VSG) control strategy has the problems of too fast system change and too large power oscillation in the case of sudden change of power command value. To solve the above problems, this paper proposes DFIG(DFIG-EFVSG) based on the arctangent function of the flexible virtual synchronous machine(EFVSG) control strategy to improve the frequency stability of the wind power grid-connected system. Firstly, the mathematical model of DFIG and traditional VSG control strategy is established. Then, the corresponding relationship between the moment of inertia and the frequency of DFIG-EFVSG wind power grid-connected system is analyzed in detail, and an arctangent EFVSG control strategy is proposed. Finally, the simulation results verify the effectiveness and superiority of arctangent EFVSG control strategy.