储能辅助的孤岛微网自适应事件触发二次调频策略

doi:10.11930/j.issn.1004-9649.202210130

摘要/Abstract

摘要： 高新能源渗透率下，孤岛微网的频率稳定性受到新能源不确定出力和负荷随机波动的双重挑战。现有考虑储能辅助的微网二次调频方案主要采用周期触发控制方式，存在网络带宽占用率高的不足。为此，提出一种考虑储能辅助和不确定延时的自适应事件触发二次调频策略。首先，设计了一种考虑储能荷电状态（state-of-charge，SoC）的自适应参与机制，在不影响控制结构的同时避免了储能过充过放问题。其次，为降低网络带宽占用率，设计了一种自适应事件触发控制（event-triggered control，ETC）策略，仅当二次调频系统偏差超过触发阈值后才触发状态量与控制指令交互。最后，基于Lyapunov稳定性理论推导了ETC参数的设计准则。仿真算例表明，与周期触发控制方案相比，所提方法的网络带宽占用率下降了95.3%，频率偏差的绝对值积分则下降了8.98%。

关键词: 孤岛微网, 二次调频, 事件触发, 储能, 自适应控制

Abstract: Under the high penetration of new energy, the frequency stability of islanded microgrids is challenged by the uncertain output of new energy and the random fluctuation of load. The existing secondary frequency control schemes with auxiliary energy storage systems mainly adopt periodic trigger control schemes, which have the disadvantage of high network bandwidth occupancy. Therefore, an adaptive event-triggered secondary frequency control strategy considering auxiliary energy storage systems and uncertain delays is proposed. First, an adaptive participation mechanism considering the state-of-charge (SoC) of energy storage devices is designed to avoid overcharge and overdischarge without affecting the control structure. Second, in order to reduce the network bandwidth occupation, an adaptive event-triggered control (ETC) strategy is designed. Only when the deviations of the secondary frequency control system exceed the trigger threshold, the statuses and control instructions can be transmitted. Finally, the design criteria of ETC parameters are derived based on Lyapunov stability theory. Simulation results show that compared with the periodic trigger control scheme, the proposed method reduces the network bandwidth occupancy by 95.3%, and the absolute value integral of frequency deviation is reduced by 8.98%.

Key words: islanded microgird, secondary frequency control, event-triggered control, energy storage system, adaptive control

薛飞, 李宏强, 田蓓, 马鑫. 储能辅助的孤岛微网自适应事件触发二次调频策略[J]. 中国电力, 2023, 56(9): 196-205.

XUE Fei, LI Hongqiang, TIAN Bei, MA Xin. Adaptive Event-Triggered Secondary Frequency Control in Islanded Microgrids with Auxiliary Energy Storage Systems[J]. Electric Power, 2023, 56(9): 196-205.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202210130

https://www.electricpower.com.cn/CN/Y2023/V56/I9/196

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