基于光伏发电的直流微电网能量变换与管理

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Abstract In order to optimize energy utilization and realize system stability, an energy conversion and management control based on improved DC bus signaling(DBS) is proposed for DC microgrid based on photovoltaic(PV) generation. The DC microgrid is composed of three modular DC-DC converters for PV arrays, two bidirectional grid-tied DC-AC converters, one DC-DC converter for battery charging/discharging and local loads, which is available of either grid-tied operation or islanding operation. The operations of system are categorized into four modes: islanding with battery discharging, grid-tied rectification, grid-tied inversion and islanding with constant voltage generation. The DC bus voltage level is employed as an information carrier to determine operation mode switching. Hence, there is no centralized controller, and the reliability is enhanced. Control methods of PV converter, grid-tied converter, and battery converter are presented. The power balance of the system under extreme conditions such as the islanding operation with full-charged battery is taken into account. Experimental results verify the practical feasibility and effectiveness of the proposed control strategy.

Key words： Power converter photovoltaic generation renewable energy generation energy management DC microgrid

Received: 11 August 2011 Published: 28 November 2013

PACS:

TM464

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	Zhang Li
	Sun Kai
	Wu Tianjin
	Xing Yan

Cite this article:

Zhang Li,Sun Kai,Wu Tianjin等. Energy Conversion and Management for DC Microgrid Based on Photovoltaic Generation[J]. Transactions of China Electrotechnical Society, 2013, 28(2): 248-254.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I2/248

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