A Fast Power Calculation Algorithm for Three-Phase Droop-Controlled-Inverters Using Combined SOGI Filters and Considering Nonlinear Loads

The power calculation is an indispensable element in droop-controlled inverters because the bandwidth of measured has a direct impact on controller performance. This paper proposes fast and accurate algorithm based combined Second Order Generalized Integrator (SOGI) filters stationary coordinates for three-phase system, which takes into consideration use nonlinear loads. scheme formed by two-stage SOGI that are employed obtaining active reactive powers required to perform droop-based inverter operation, respectively. From structure, first used as band-pass filter (BPF) filtering harmonics fundamental current load; second low-pass (LPF) extracting DC-component, corresponds with average power. A small-signal model two system built obtain dynamical response stability margin system. And compared it behaviour standard droop-control method. Next, proposed designed order achieve same ripple amplitude voltage obtained method adjusting gains. Through simulation hardware loop (HIL) validation, approach presents faster more performance when sharing loads, also drives inverters’ output lower distortion.