提高储能VSG并网有功响应性能的暂态阻尼策略

Transient damping strategies to improve grid-connected active response performance of energy storage VSG

储能虚拟同步发电机(VSG)的并网有功在有功指令与电网频率2种扰动下存在动态超调与稳态偏差。提出有功微分反馈补偿(ADFBC)和有功微分前馈补偿(ADFFC)2种暂态阻尼策略,并在分别建立典型VSG、ADFBC和ADFFC 3种策略并网有功闭环小信号模型的基础上,给出了相应的参数设计方法。仿真和实验对比结果均验证了所提ADFBC和ADFFC暂态阻尼策略可有效提高储能VSG并网有功响应,在2种扰动下其并网有功既无动态超调又无稳态偏差。

The grid-connected active power of the energy storage virtual synchronous generator(VSG)has the problems of dynamic overshoot and steady-state deviation under the two disturbances of active power command and grid frequency.Two transient damping strategies of active differential feedback compensation(ADFBC)and active differential feedforward compensation(ADFFC)are proposed.Based on the established grid-connected active closed-loop small-signal models of three strategies of typical VSG(TVSG),ADFBC and ADFFC,the corresponding parameter design methods are given.The simulative and experimental comparison results are used to verify that the ADFBC and ADFFC transient damping strategies can effectively improve the grid-connected active power response performance of the energy storage VSG,that is,its grid-connected active power has neither dynamic overshoot nor steady-state deviation under the two disturbances.