光伏并网逆变器最大功率传输控制研究

Research on Maximum Power Transfer Control of Photovoltaic Grid Connected Inverters

建立了光伏并网逆变器的EL功率模型。基于EL功率模型和无源控制理论,通过光伏阵列MPPT的最大功率计算光伏并网逆变器期望最大输出功率,利用阻尼注入方法设计了光伏并网逆变器无源功率控制器。该无源功率控制器可使光伏并网逆变器输出功率有效跟踪光伏阵列最大功率点的功率,进而实现最大功率传输;同时可实现网侧单位功率因数、电流低谐波。仿真及实验结果表明基于EL功率模型的无源功率控制器可实现光伏并网逆变器最大功率传输。

Euler Lagrange(EL) power model of photovoltaic grid-connected inverter is set up. On the basis of EL power model and passivity based control theory, passivity based power controller is designed utilizing desired maximum output power of photovoltaic grid-connected inverter calculated MPPT of photovoltaic array and damping injecting. Maximum power of photovoltaic array MPPT is good tracked by output power of grid connected inverter based on passivity based power controller, and maximum power transfer is realized. Unity power factor and low current harmonic distortion in AC side are obtained. Simulation and experimental results show that maximum power transfer of photovoltaic grid connected inverters can be realized by passivity based power controller based on EL power model.