双馈抽水蓄能机组最优功率控制策略及提升风电并网能力仿真

OPTIMAL POWER CONTROL STRATEGY OF DOUBLY-FED PUMPEDENERGY STORAGE UNIT AND SIMULATION OF IMPROVEMENT OFWIND POWER GRID CONNECTION ABILITY

提出一种考虑损耗及转速影响的抽水蓄能机组最优功率控制策略。首先,对抽水蓄能机组在发电和抽水工况下的功率损耗来源进行辨析,推导计及损耗与转速影响的电磁功率与机械功率表达式。然后,计及转子动能对阶跃变化与斜坡变化的不同功率控制策略进行调节能力分析,提出最优功率协调控制策略。最后,构建半实物仿真平台对发电与抽水工况下抽水蓄能机组的不同有功功率阶跃模式进行仿真对比验证。结果表明,该文所提控制策略可优化调速器与励磁控制的协调配合,与传统方法相比,该文方法的功率调节速率更快,对电网功率指令的响应也更为准确,且有效缓解了风电等新能源所带来的消纳及一次调频问题。

This paper proposed an optimal power control strategy of AC excited pumped energy storage unit considering the influence of unit loss and speed.Firstly,this paper analyzed the sources of power loss in the power generation and pumping modes,and obtained the expressions of electromagnetic power and mechanical power considering the influence of loss and speed.Then,considering the influence of rotational energy,the adjustment ability of different power control strategies based on step change and slope change is analyzed,and the optimal power coordinated control strategy of doubly-fed pumped energy storage was obtained.Finally,a semi-physical simulation platform was constructed to simulate and compare the different active power step modes of pumped ebergt storage units under power generation and pumping conditions.The results showed that the control strategy proposed in this paper can optimize the coordination between governor and excitation control.Compared with the traditional method,the power regulation rate of the proposed method is faster and the response to the power command of the power grid is faster and more accurate.It also effectively alleviated the problem of new energy consumption and primary frequency regulation caused by new energy sources such as wind power.