基于电网阻抗识别的谐波控制器调度策略

For the oscillation problem of active power filter caused by phase lag of harmonic controller in weak grid, a harmonic controller scheduling strategy was proposed based on grid impedance identification algorithm. When the grid impedance became large and the voltage was distorted, the grid impedance was identified by active harmonic injection method and Goertzel algorithm firstly, and then the harmonic controller was reasonably scheduled according to the measured grid impedance. So the system could have enough stability margins when the control bandwidth was low. To ensure the reliability of the scheduling strategy and reduce the influence of active harmonic injection on the power grid, detailed harmonic injection rules and system operation rules were designed. Finally, the feasibility and effectiveness of the control strategy were verified by experiments on physical experiment platform.