A Broadband Impedance On-line Measurement Method for Power Grids and Inverters

Accurate measurement of grid impedance and inverter impedance is an important part of impedance stability analysis. Measurement using the traditional sweep method cannot measure the impedance of the grid impedance and the inverter impedance accurately and quickly at the same time. To address this problem, this paper proposes an optimized multi-sine perturbation injection method to improve the impedance measurement efficiency, which can measure the inverter impedance and grid impedance accurately at the same time. Finally, a low-voltage broadband impedance measurement platform is built to verify the effectiveness and accuracy of the method.