A novel active power control strategy in islanded multifrequency microgrid based on source cost and availability

Active power balancing in islanded multifrequency microgrids (MFMGs) is complex, as multiple frequency power components coexist on a common bus and distributed energy sources are heterogeneous in cost. In this paper, a centralized cooperative active power balancing strategy is proposed that dispatches sources in a cost-preferred and availability-aware order and coordinate the battery energy storage to compensate for power mismatch. All possible multifrequency power imbalance cases are enumarated and a unified control algorithm is presented that can obtain the source-side power references under different operating conditions. The effectiveness of the proposed strategy is validated by the MATLAB/Simulink simulation of a nine-bus islanded MFMG under time-varying load demand and source availability. Simulation results show that the proposed algorithm can balance the active power on multiple frequency channels and keep the multifrequency bus voltage stable. We quantitatively show that nearly 95% of the total load demand is served, the operational cost is about 6–7% lower than that of the conventional dispatch strategy, and the overall system efficiency is close to 93%. This verifies the effectiveness and economy of the proposed multifrequency power balancing framework.