Optimal Decentralized Economical-sharing Scheme in Islanded AC Microgrids with Cascaded Inverters
For microgrid operators, this provides a communication-free solution to economical dispatch, but the approach is incremental as it builds on existing droop control concepts.
The paper proposes a decentralized economical-sharing scheme for islanded AC microgrids with cascaded inverters, using frequency to synchronize DGs and current sharing to achieve optimal dispatch without communications. Simulations and experiments verify the scheme's effectiveness.
To address the economical dispatch problem without communications in islanded AC microgrids consisting of cascaded inverters, this paper proposes an optimal decentralized economical-sharing scheme. In proposed scheme, optimal sharing function of the current is applied to generate the reference voltages. And the frequency is used to drive all distributed generators (DGs) synchronize operation in microgrids. When the microgrid is in steady state, DGs share a single common frequency and current in terms of the proposed scheme. Thus the potential advantages of simplicity and decentralized manner are retained. The AC microgrid model has been developed through simulations and experiments to verify the effectiveness and performance of the proposed scheme.