光伏发电逆变器结构设计的优化策略

Optimal Strategies for Structural Design of Photovoltaic Inverters

光伏并网发电技术是光伏发电的趋势,对缓解能源短缺具有重要作用。并网逆变器是光伏发电系统的核心部件,以DSP为主控芯片设计3kWp的并网逆变器。分析光伏并网逆变器主电路拓扑结构,提出并网逆变输出反馈控制技术。基于DSP设计单相并网逆变器系统主控制电路,包括通信电路和采样电路等,给出系统软件主程序,实现系统硬件电路设计。太阳能光伏阵列输出特性受外界因素影响,利用变步长算法跟踪电池阵列最大输出功率,介绍主被动式检测方法。

The grid-connected photovoltaic power generation technology is the trend of photovoltaic power generation,which plays an important role in alleviating the energy shortage.The grid-connected inverter is the core component of the photovoltaic power generation system.The 3kWP grid-connected inverter is designed with DSP as the main control chip.The main circuit topology of grid-connected photovoltaic inverter is analyzed,and the output feedback control technology of grid-connected inverter is proposed.The main control circuit of single-phase gridconnected inverter system is designed based on DSP,including communication circuit,sampling circuit,etc.The main software program of the system is given,and the hardware circuit design is realized.The output characteristics of solar photovoltaic array are affected by external factors.A variable step size algorithm is used to track the maximum output power of the array.A passive detection method is introduced.