极点配置双闭环控制单相并网逆变器研究

The Research of Single Phase Grid-connected Inverter Based on Pole Assignment for Dual Closed-Loop Control

并网逆变器正广泛应用于太阳能和风能等新能源发电领域。在建立单相隔离并网逆变器数学模型的基础上,使用无源阻尼抑制谐振,并采用带电网电压前馈的电流双闭环控制策略。分析了无源阻尼的选取对谐振抑制的影响,用极点配置方法设计了调节器参数,并对用电网电压前馈消除电网电压扰动的原理进行分析,最后给出在阻性负载突变下的仿真和实验波形。仿真和实验结果表明,并网电流和电网电压基本同频同相。

Grid-connected inverter is widely used in solar and wind energy generation. On the basis of the mathematical model of a single phase isolated grid-connected inverter, the resonance is decreased with passive damping, and current dual closed-loop control strategy with utility voltage feedforward is utilized. The influence of inhibiting resonance with different passive damping is analyed. The regulator parameters is designed with pole assignment method. The utility voltage feedforward principle to eliminate grid voltage disturbances was analyzed. Finally, the resistive load mutation simulation and experimental waveforms are presented. The simulation and experimental results proved that grid-connected current and grid voltage have the same frequency and phase.