考虑分布式储能参与的直流配电网电压柔性控制策略

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Abstract Aiming at the difficulty of voltage control and poor stability for DC distribution network with multiple nodes, a novel flexible voltage control strategy considering distributed energy storage (DES) is proposed in this paper. Firstly, the topology structure is analyzed. The disadvantages of existing voltage control method and feasibility of voltage regulation with DES are analyzed. Secondly, the voltage-frequency relationship of AC-DC interface and cascading droop characteristic of bidirectional DC-DC interface are deduced. For terminal AC-DC interface, based on the relationship between virtual inertia and the DC voltage fluctuations, the virtual voltage variation is utilized to control energy storage to compensate frequency drop, hence the impacts on grid can be reduced. For interfaces between distribution network and microgrids, the control strategies of DES are designed in accordance with the type of interface. As a result, the DES can respond to voltage change, enforce the dynamic stability of network voltage, and reduce the possibility of DC network operation mode change. The strategy is independent of communication with scalability. Finally, a dual-terminal DC distribution network model is established. The simulation results validate feasibility and effectiveness of the proposed voltage control strategy.

Key words： DC distribution network voltage control distributed energy storage (DES) droop characteristics AC-DC coupling

Received: 21 October 2016 Published: 26 May 2017

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TM72

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	He Li
	Li Yong
	Cao Yijia
	Wang Weiyu

Cite this article:

He Li,Li Yong,Cao Yijia等. Flexible Voltage Control Strategy of DC Distribution Network Considering Distributed Energy Storage[J]. Transactions of China Electrotechnical Society, 2017, 32(10): 101-110.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I10/101

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