An integrated control strategy of PV-battery hybrid systems

A common DC bus connected PV-battery system is introduced, in which two asymmetry PV boost converters can work respectively or together, the T-type three-level DC/AC converter could operate in four-quadrant, the battery exchange power with the common DC bus via a bi-directional DC/DC converter (BDC), and some more peripheral equipments are introduced to make up the whole system. The overall control strategy of the system is given out including the detailed control strategy of each sub-circuit, along with coordinated control method among parts of the inverter. A superior optimizing algorithm loading in the energy management system (EMS) was put forward as well to improve self-consumption of the system based on rules and restrictions. Experiments results are shown to verify the effectiveness and test the self-consumption of an elaborate PV-battery hybrid system.