基于滑模控制的独立光伏发电系统控制策略

针对独立运行的光伏发电系统,提出了基于滑模控制的最大功率跟踪(MPPT)策略;针对光伏微源输出功率随机性引起的逆变器输入侧直流母线电压波动,通过储能控制实现电压稳定;针对负载变化引起的系统输出电压波动,设计了系统输出电压电流双闭环控制器。通过MatLab/Simulink对提出控制策略进行了仿真验证。分析结果表明,所提出滑模控制策略可实现光伏电池的MPPT;储能控制策略可有效抑制光伏微源输出功率波动引起的直流母线电压波动;输出电压控制策略能稳定系统电压,确保安全可靠运行。

Control Strategy of Independent Photovoltaic Power Generation System Based on Sliding Mode Control

The maximum power point tracking strategy based on sliding mode control is proposed for the photovoltaic power generation system running independently;the voltage stability is achieved by energy storage control for the DC bus voltage fluctuation on the input side of the inverter caused by the randomness of the output power of the photovoltaic microsource;the double closed-loop controller of the system output voltage and current is designed for the system output voltage fluctuation caused by the load change. The proposed control strategy is simulated by MatLab/Simulink. The analysis results show that the proposed sliding mode control strategy can achieve MPPT of photovoltaic cells;the energy storage control strategy can effectively suppress the DC bus voltage fluctuation caused by the output power fluctuation of photovoltaic micro sources;the output voltage control strategy can stabilize the system voltage and ensure safe and reliable operation.