Robust Suppression Strategy for Photovoltaic Grid-Connected Inverter Cluster Resonance Based on Kalman Filter Improved Disturbance Observer

In response to the key engineering problems of photovoltaic grid-connected inverter cluster resonance suppression affected by impedance, in this paper, a control strategy based on disturbance observer is proposed dynamically compensate for damping coefficient controlled system and improve robustness system. First, an mathematical model 200 MW established, mechanism active influenced analyzed. Secondly, capacitor current feedback utilized constitute virtual damping, output impedance reshaped suppress peak. Then, Kalman filter used traditional accurately detect during dynamic process so as better adapt changes grid resonant Finally, verified with respect practical PV power station. The experimental results demonstrate feasibility method.