基于最优极点配置的光伏并网逆变器控制

Photovoltaic grid-connected inverter control based on optimal pole assignment algorithm

提出了一种带伺服补偿器的逆变器增广系统的最优极点配置和重复控制结合的单相光伏并网控制技术。分析了基于LCL型滤波器单相光伏并网逆变器的数学模型,详细介绍了带伺服补偿器的逆变器的增广系统状态反馈控制的原理和设计方法,并引入了最优极点配置法,利用非主导极点提供的自由度来提高系统的动态抗扰能力。简单介绍了并网逆变器的重复控制技术,设计了基于伺服补偿器逆变器增广系统的最优极点配置状态反馈极点配置和重复控制相结合的复合控制系统。仿真结果验证了理论分析的正确性以及控制策略的可行性。

A novel single-phase photovoltaic grid--connected inverter control system based on optimal pole- assignment and repetitive control with servo compensator was presented. The mathematical model of single-phase photovoltaic grid-connected inverter based on LCL filter was analyzed. The theory and design method of the inverter state feedback control with servo compensator were introduced. An optimal pole--assignment was designed. The freedom degree of the non-dominant pole was used to develop the ability of dynamic disturbance rejection. The repetitive control technology was introduced; the complex control system based on optimal pole-assignment state feedback pole-assignment and repetitive control technology was designed. The theory analysis and validity of control strategy were proved by the simulation results.