独立光伏发电系统统一能量控制策略

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摘要基于阻性负载随母线电压上升获取功率逐渐增大规律及能量平衡原理, 根据母线电压变化, 实现光伏电池输出、蓄电池充放电、负载供电的统一能量控制策略。该策略通过调节母线电压, 优化蓄电池在内的后级负载功率, 然后基于母线输入、输出能量平衡控制光伏功率追踪负载功率, 实现了对光伏功率的平滑控制, 省略了传统控制下的工作模式转换。同时在统一能量控制策略中采用光伏工作点寻优方法, 确保直流变换电路稳定可靠工作。Matlab系统模型仿真证明了所提控制策略的正确与可行性。

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	袁建华
	高峰
	高厚磊
	刘博
	季笑庆
	王云波

关键词 ：光伏发电, 直流母线, 统一控制, 功率, 能量, 最优

Abstract：The stand-alone photovoltaic (PV) systems depend on batteries or adjustable load to keep the balance of generated power and load. The control modes of PV generation transit among maximum power point tracking (MPPT), voltage regulating or current limiting modes using the traditional energy management system. This paper proposes a unified energy control strategy for stand-alone PV system to control PV generation, charging and discharging of battery, consumption as a whole according to the inherent theory of energy balance and DC bus voltage variation. The proposed strategy optimizes rear-end load power including battery by regulating dc bus voltage. And then it controls PV generation following load variation smoothly without using the traditional transition of control modes. Meanwhile, under the unified energy control strategy, an optimal searching method of PV working point is presented to avoid dc conversion failure. Matlab simulations show the performance of proposed control method with captured results presented for viewing.

Key words： PV generation DC bus unified control power energy optimal

收稿日期: 2010-11-01 出版日期: 2014-03-07

PACS:

TM615

作者简介: 袁建华男, 1978年生, 博士研究生, 研究方向为光伏技术应用。高峰男, 1979年生, 博士, 教授, 博士生导师, 研究方向为新能源发电及并网技术, 电力电子。

引用本文:

袁建华, 高峰, 高厚磊, 刘博, 季笑庆, 王云波. 独立光伏发电系统统一能量控制策略[J]. 电工技术学报, 2011, 26(1增): 248-253. Yuan Jianhua, Gao Feng, Gao Houlei, Liu Bo, Ji xiaoqing, Wang yunbo. Unified Energy Control Strategy of Stand-Alone Photovoltaic System. Transactions of China Electrotechnical Society, 2011, 26(1增): 248-253.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2011/V26/I1增/248

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