基于阻抗分析法的风储并网系统谐波稳定性分析

储能系统多通过逆变器接入电网，大量的并网逆变器会对网络的稳定性造成较大的影响，易引发谐振。建立了风储并网系统的阻抗模型，研究了风机转子侧电流环比例增益和积分增益、储能逆变器电流环比例增益和积分增益对系统稳定性的影响。采用基于入网电流反馈的有源阻尼振荡抑制策略，提高弱电网条件下风储并网系统的谐波稳定性，并分析了其控制参数对谐波振荡抑制的影响。最后通过仿真结果，验证了分析结论的准确性和方法的有效性。

Harmonic Stability Analysis of Wind-storage Grid-connected System Based on Impedance Analysis Method

Most energy storage systems are connected to power grid through inverters， and a large number of grid-connected inverters have great influence on the stability of power network and easily cause resonance. Impedance model of wind-storage grid-connected system is established， and the effects of proportional and integral gains of the rotor-side current loop of wind turbine and the proportional and integral gains of the current loop of energy storage inverter on the stability of the system are studied respectively. The active damping oscillation suppression strategy based on grid-connected current feedback is adopted to improve the harmonic stability of wind-energy storage grid-connected system under the condition of weak current grid，and the influence of damping control parameters on harmonic oscillation suppression is analyzed. Simulation results verify the accuracy of analysis conclusion and the effectiveness of the method.