独立微电网风储协同调频的功率柔性分配策略

doi:10.19595/j.cnki.1000-6753.tces.211032

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Abstract Aiming at the issue of frequency fluctuations and low utilization of new energy in isolated microgrid operation, a flexible power distribution strategy with wind turbine generator (WTG) and energy storage (ES) equipment for frequency regulation is proposed in this paper. Firstly, the operating characteristics and corresponding control modes of various distributed generations in isolated microgrid are analyzed. Secondly, the state space model of isolated microgrid with WTG and ES participating in frequency regulation is established. Then, the optimized objective function in the rolling time domain is constructed with the goal of minimizing frequency deviation and maximizing energy utilization rate. And according to the frequency variation, the weight coefficients of the WTG and ES output power item in the objective function are adjusted in real time. Furthermore, the proposed strategy can flexibly adjust the boundary of the constraint conditions at each time section according to the time-varying characteristics of the wind speed and the state of charge (SOC) of ES, which can improve their safe operation level. Finally, the isolated microgrid model is built in MATLAB/Simulink platform, and the proposed control strategy is verified under different working cases. Simulation results show that, under the premise of satisfying the safety operation, the proposed strategy can realize isolated microgrid frequency control while optimizing the active power output of WTG and ES, reducing the wind power curtailment ratio, and achieving the goal of efficient utilization of energy. One more feature of the proposed strategy is the low dependence on the model parameter, which is conducive to robustness.

Key words： Isolated microgrid frequency regulation flexible power distribution efficient utilization of energy wind turbine generator energy storage

Received: 12 July 2021

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TM712

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	Zhang Jing
	Zhang Zhiwen
	Hu Sijia
	Li Yong
	Lin Jinjie

Cite this article:

Zhang Jing,Zhang Zhiwen,Hu Sijia等. A Flexible Power Distribution Strategy with Wind Turbine Generator and Energy Storage for Frequency Regulation in Isolated Microgrid[J]. Transactions of China Electrotechnical Society, 2022, 37(15): 3767-3780.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.211032 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I15/3767

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