Distributed Optimal Control of AC/DC Hybrid Microgrid Groups with Interlinking Converters

A distributed optimal control strategy based on finite time consistency is proposed in this paper, to improve the optimal regulation ability of AC/DC hybrid microgrid groups. The control strategy is divided into two steps: one is within a microgrid and the other is among microgrid groups. In the element of control in a microgrid, the power mapping factor and the secondary adjustment term of finite time consistency are introduced into the traditional droop control, to realize the autonomous and stable optimization in the island mode. In the control of microgrid groups, the local control strategy of interlinking converter (ILC) based on average power mapping factor is constructed, and the compensation term based on finite-time consistency is employed to realize the power optimization operation among different microgrids jointly. Then the stability and convergence of the finite time consistent control strategy are analyzed. Finally, the simulation model is established by Matlab/Simulink to prove the effectiveness of the method.