A Joint Power Supply Scheme of Energy Storage System and Utility Grid

Solar photovoltaic (PV) power generation is becoming more and more popular, but the users hope that the output power of PV systems can be consumed selfishly and don’t provide the grid with remnant electricity. To reduce the reverse power flow, various studies have sprung up. In this paper, a joint power supply scheme of energy storage system and utility grid, which is based on the virtual synchronous generator technology, is proposed and the effectiveness of the scheme is testified by the experiment results. In the methodology, the output power of the load is set as the reference of the active power and reactive power loop. In this way, the converter output can trace the output of the load so that reverse power flow is prevented. At the same time, the converter adopted virtual synchronous generator technology can provide the grid with inertia and damping characteristics to improve the stability of the converter working in the weak utility grid.