Power allocation strategy for multi VSG parallel networks
Sun Ge, Zhang Zhiyu, Ma Ruwei · DOAJ (DOAJ: Directory of Open Access Journals) · 2018
Virtual synchronous generator(VSG) control algorithm can simulate the characteristics of the traditional synchronous generator, inverter with control can provide the voltage and frequency support for large power grid, and the corresponding inertia and damping characteristics,improving the stability of large power grid . In this paper, an excitation regulator is introduced into the outer ring based on double closed loop control strategy of VSG virtual impedance under islanding micro grid. Taking into account the actual wire parameters, this paper proposes a multi VSG parallel network power allocation strategy, by setting up two simulation models of VSG parallel system with different capacities, the power allocation of VSG under the grid connected capacity according to the rated capacity ratio is achieved. Experimental results show that the power allocation strategy in parallel with multi VSG can achieve seamless and smooth switching of off/grid operation mode, and has better feasibility and applicability.