摘要
为了抑制LCL滤波器的固有谐振,消除电网电压畸变时并网电流内的谐波,此处提出一种在网侧电流闭环条件下的电容电流反馈、电网电压前馈控制方法。通过引入电容电流反馈环节,使LCL滤波器的固有谐振减小,且电容电流通过估算获得,减少了传感器的数量。在电网电压畸变的情况下引入电网电压前馈环节,消除了并网电流内的低次谐波,得到高质量输出电流。仿真和实验结果表明所提控制策略的有效性。
In order to suppress the inherent resonance of the LCL filter and eliminate harmonics in the grid current when the grid voltage is distorted, a method of capacitor current feedback and grid voltage feedforward control is proposed.By introducing capacitive current feedback,inherent resonance of the LCL filter is reduced,and the capacitor current is estimated to reduce the number of sensors.In the case of grid voltage distortion, the feedforward link of the grid voltage is introduced to eliminate the low harmonics in the grid-connected current and obtain a high-quality output current.Simulation and experimental results show that the proposed control strategy is effective.
引文
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