无通信高电能质量的微电网平滑切换控制策略

doi:10.19595/j.cnki.1000-6753.tces.210575

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Abstract The paper proposes a smooth transition control strategy for microgrids with high power quality and no need for remote communication lines. The microgrid is mainly composed of multiple parallel distributed power generation units and a pre-synchronization unit. A unified grid-connected current control structure is proposed for the interface inverter in the distributed power generation unit, which has the following advantages: ① Without island detection, the inverter can automatically switch between the current control state of the grid-connected mode and the voltage control state of the stand-alone mode to ensure the load power supply quality; ② The proposed unified grid-connected current control structure can effectively suppress the harmonics in grid-connected current and capacitor voltage; ③ When the grid frequency fluctuates, the inverter can still output the corresponding active and reactive power according to the command value, and can synchronize with the grid without a phase-locked-loop or a frequency-locked-loop in the grid-connected operation state. In addition, the proposed pre-synchronization unit can realize the pre-synchronization control of the microgrid voltage and the grid voltage without relying on the remote communication lines. It also reduces the inrush current when the stand-alone operation state changes to the grid-connected operation state. Finally, the control parameters are optimized, and the effectiveness and feasibility of the proposed control strategy are verified through experiments.

Key words： Seamless transition grid-connected mode stand-alone mode pre-synchronization power quality

Received: 23 April 2021

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TM464

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	Articles by authors
	Guo Huizhu
	Meng Xin
	He Mingzhi
	Liu Xueshan
	Liu Jinjun

Cite this article:

Guo Huizhu,Meng Xin,He Mingzhi等. An Enhanced Power Quality and Smooth Transition Control Strategy for a Microgrid without Remote Pre-Synchronization Communication[J]. Transactions of China Electrotechnical Society, 2022, 37(10): 2611-2621.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210575 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I10/2611

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