基于光伏发电的直流微电网能量变换与管理

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摘要针对基于光伏发电的直流微电网系统,提出一种改进的基于直流总线电压信息的能量变换与管理方法,旨在实现能量最优利用和系统稳定工作。系统由三个模块化光伏接口变换器、两个模块化网侧接口变换器、一个储能接口变换器和本地负载组成,既可并网运行、也可孤岛运行。系统分为四种工作模态,分别是孤岛运行蓄电池放电、并网整流、并网逆变和孤岛运行光伏接口变换器输出恒压。系统模态及其切换由直流总线电压决定,无需集中控制器,提高了系统可靠性。分别给出了光伏、网侧和储能接口变换器的控制方法,使得系统在极端条件下,如孤岛运行蓄电池满电荷状态仍能达到功率平衡。实验结果验证了提出方法的有效性和可行性。

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	张犁
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关键词 ：功率变换器, 光伏发电, 新能源发电, 能量管理, 直流微网

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

收稿日期: 2011-08-11 出版日期: 2013-11-28

PACS:

TM464

基金资助:国家自然科学基金(51077071,51177083),江苏省科技成果转化基金(BA2008001)和江苏省优势学科建设资助项目。

作者简介: 张犁男，1985年生，博士后，研究方向为电力电子与电力传动。孙凯男，1977年生，副教授，研究方向为电力电子与电力传动。

引用本文:

张犁, 孙凯, 吴田进, 邢岩. 基于光伏发电的直流微电网能量变换与管理[J]. 电工技术学报, 2013, 28(2): 248-254. Zhang Li, Sun Kai, Wu Tianjin, Xing Yan. Energy Conversion and Management for DC Microgrid Based on Photovoltaic Generation. Transactions of China Electrotechnical Society, 2013, 28(2): 248-254.

链接本文:

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

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