Power distribution using tariff-driven gain-scheduling in residential DC microgrids

The residential buildings take a large part of the electricity consumption. The building microgrid will play an important role in the future, to improve the energy efficiency, reduce environmental impacts, as well as enhance power system stability. This paper proposes a distributed tariff-driven droop gain-scheduling method, to solve the power distribution between different energy resources as well as the grid connected converter, for residential building microgrid operating in grid-connected mode. Tariff-driven functions are used to adjust droop gains in the voltage control loop. In this way, the power distribution ratio can be changed automatically according to the tariff conditions, as time-of-use electricity tariff. And also near-optimization in economic can be implemented, with properly chosen parameters in tariff functions. A residential building DC microgrid including solid oxide fuel cell, photovoltaic panel and grid connected converter is modeled with MATBLB/Simulink and used to verify the proposed method.