Improved power computation method for droop‐controlled single‐phase VSIs in standalone microgrid considering non‐linear loads

Computation of active and reactive powers is a crucial step in droop-controlled single-phase voltage source inverters (VSIs) standalone microgrid since the performance stability power-sharing strategy are strongly influenced by its speed accuracy, especially case non-linear loads. Here, an improved among VSIs islanded microgrid, considering DC component nonlinear loads presented. To achieve this goal, enhanced control scheme including Multiple Enhanced Second-Order Generalized Integrator Frequency-Locked Loop (MESOGI-FLL) for power calculation proposed. As result, proposed computation technique provides high rejection capability current harmonics, hence, perfect estimation fundamental inverter output 90◦ phase-shifted component. This makes method-based immune to disturbance effects harmonics. Detailed analysis, mathematical modelling MESOGI, as well comparison with recent methods, also provided. Simulation experimental tests were carried out obtained results have shown effectiveness robustness controller even under load operating conditions.