Cost-Based Interlinking Converter Droop Control Strategy for Load Management with Improved Voltage Regulation in AC–DC Microgrid

摘要

Power transfer between sub-grids to meet load demand in hybrid microgrids is a complex task in a decentralized architecture. It is realized by coordinating the control strategies on AC and DC sub-grids with interlinking converter droop control. Local loads on either sub-grids are shared among distributed generators present in the sub-grids. If there is any load generation mismatch, ILC will transfer power from surplus to deficit region. Transfer of power from AC microgrid to DC microgrid and vice versa is achieved by ILC droop control strategy. The proposed cost-based droop control strategy for ILC with $$v - {ext{d}}p{ext{/d}}v$$ v - d p /d v control scheme on DC microgrid and frequency-based droop control on AC microgrid reduces the cost incurred in transferring power via ILC along with droop control. This DC side droop control improves ILC DC bus voltage regulation better than existing control strategy. Superimposed frequency droop control strategy is superior to the voltage-based droop control strategy in improving power transfer through ILC and remains stable over a wide range of ILC droop gain. The proposed system is implemented in MATLAB/Simulink to verify the effectiveness of this control strategy.