基于双向变换器的光伏储能控制

光伏发电系统通过双向变换器引入储能环节进行控制,光伏电池发出的能量经DC-DC变换后供给直流母线侧负载,并通过双向变换器使用蓄电池进行能量管理.介绍了双向变换器的工作原理,分析了光伏电池、蓄电池和直流母线负载所消耗的能量处于不同状态时的系统能量管理策略.给出了基于Boost变换器的光伏电池最大功率跟踪的控制算法和基于双向变换器的蓄电池充放电控制算法,提出了一种改进的充电控制策略.以MATLAB/Simulink为仿真平台,搭建了该系统的仿真模型,并针对系统的各工作状态进行仿真研究,仿真试验结果验证了该系统控制算法的合理性和可行性.

Photovoltaic Power Store Based on Bidirectional Converter

A stand-alone photovoltaic ( PV) power system with storage batteries is designed. Power from PV modules is sent to the load on the DC bus through a DC-DC converter,and a bidirectional converter is used for storage batteries. Charge the storage batteries when the power from PV modules is more than the power that load needs;Storage batteries provide power for load when the power from PV modules is less. The maximum power point tracking algorithm is adopted to ensure PV modules and provide the maximum power under certain conditions. In terms of software,the paper describes the control procedure in the whole and gives the algorithm and software design flow chart. The simulation model is built based on MATLAB/Simulink. The simulation and experimental results prove the rationality and feasibility of stand-alone PV power system.