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大规模风电接入对电力系统的频率造成影响。抽水蓄能机组由于其出力响应迅速、调节灵活等特性,在风电功率波动的调节中具有重要作用。该文针对短时风电功率波动对电力系统造成的频率扰动问题,提出抽水蓄能机组频率调节的鲁棒控制策略。通过建立电力系统整体状态方程,并考虑风电功率波动特性和抽水蓄能电站动态特性,采用基于线性矩阵不等式(linear matrix inequality,LMI)的H∞鲁棒控制算法,对抽水蓄能机组一次调频控制方程进行求解。利用IEEE39节点系统进行仿真验证,结果表明提出的鲁棒控制策略能有效地减小风电功率波动造成的系统频率偏差,提高了抽水蓄能机组对短时风电功率波动的调节响应性能。
Large-scale wind power access affects the power system frequency. Due to the rapid response and flexible regulation of pumped storage unit, it plays an important role in the regulation of wind power fluctuation. Aiming at the problem of frequency disturbance caused by short-term wind power fluctuation on power system, this paper proposes a robust control strategy for frequency regulation of pumped storage units. Through the establishment of the general state equation of power system and considering the characteristics of wind power fluctuation and the dynamic characteristics of pumped storage power station, a H∞ robust control algorithm based on linear matrix inequality (LMI) Equation solution. The simulation results show that the proposed robust control strategy can effectively reduce the system frequency deviation caused by wind power fluctuation and improve the response performance of the pumped storage unit to short-term wind power power fluctuations.