Power allocation strategy of virtual synchronous generator parallel system based on adaptive virtual impedance

The virtual synchronous generator control strategy can effectively improve the inertia and frequency stability of the microgrid. However, in the system of parallel virtual synchronous generators (VSG), there is a problem of uneven distribution of output power. In this regard, this paper first analyzes the reasons for the uneven power distribution of the virtual synchronous generator from the perspective of line impedance. Then, on this basis, a control method based on VSG is proposed, which can effectively improve the power distribution accuracy of the system. Aiming at the problem of voltage drop caused by virtual impedance, a control method based on reactive loop voltage feedback is proposed to reduce voltage drop. Finally, a simulation platform consisting of three VSGs is built to verify that the proposed method can improve the voltage drop while improving the power distribution accuracy of the parallel system.