Z源升压变换器光伏系统最大功率点跟踪研究

Research on Maximum Power Point Tracking Based on Z-source Boost Converter in Photovoltaic Systems

随着光照强度和环境温度的变化,光伏电池的最大功率点(MPP)也随之改变。为了实现光伏系统最大功率点跟踪(MPPT),将Z源升压变换器应用于光伏系统最大功率点跟踪电路,然后设计了Z源升压变换器的控制方法-改进电导增量法控制策略,最后设计出一种基于PI控制器的充电控制器。通过仿真结果验证了理论分析的正确性。

With variations of light intensity and ambient temperature,the maximum power point(MPP)of photovoltaic batteries changes.To achieve maximum power point tracking(MPPT)in photovoltaic systems,the Z-source boost converter was applied to the MPPT circuit in the photovoltaic system.Then,an improved incremental conductance control strategy was designed to control the Z-source boost inverter.Finally,a charge controller based on PI controller was designed.The correctness of theoretical analysis was validated by simulation results.