摘要：
本发明提供一种提高单相光伏逆变器对弱电网的适应性的控制方法及系统，将并网点电压反馈信号进行处理后叠加至电流调节器的输出，补偿采样和控制延迟，实现对并网点电压反馈信号的相位校正，提高了单向光伏逆变器对弱电网的适应性，从而实现逆变器在弱电网下的稳定运行。一种提高单相光伏逆变器对弱电网的适应性的控制方法，包括如下步骤：S1、获取并网点的电压反馈信号和电感电流，电压反馈信号的采样延迟传递函数分别为，电感电流的采样延迟传递函数为；S2、将反馈信号代入电流调节器得到调节信号；S3、将反馈信号代入相位调节器得到调节信号；S4、将和相加得到调制信号，并送入PWM生成器，产生逆变器各开关管的PWM驱动信号。
摘要（英）：
The invention provides a control method and a system for improving adaptivity of a single-phase photovoltaic inverter on a weak power grid. A voltage feedback signal V of a grid-connected point is processed and overlaid to the output of a current regulator; then compensation sampling and delay control are performed to realize the phase correction of the voltage feedback signal of the grid-connected point; and the adaptivity of the single-phase photovoltaic inverter on the weak power grid is improved, so that the stable operation of the inverter under the weak power grid is realized. The control method for improving the adaptivity of the single-phase photovoltaic inverter on the weak power grid comprises the following steps of S1, obtaining the voltage feedback signal V and the inductive current i of the grid-connected point, wherein the sampling delay transfer functions of the voltage feedback signal V are H; and the sampling delay transfer functions of the inductive current i are H; S2, substituting the feedback signal i into the current regulator to obtain a regulation signal V; S3, substituting the feedback signal V into a phase regulator to obtain a regulation signal V; and S4, enabling V to be added to V to obtain a modulation signal V which is sent to a PWM generator so as to generate PWM driving signals of each switching tube of the inverter separately.
