Active Power Allocation of Virtual Synchronous Generator Considering Multiple Operating Scenarios

In applying virtual synchronous generator (VSG) to solve the low system inertia issue in the microgrid, especially in a microgrid without secondary control loop, one aspect that should be considered is the allocation of the VSG active power output. It should be properly determined to maintain the frequency of microgrid within the allowable margin, including during a large system disturbance. This paper presents an approach to obtain a proper active power reference of VSG using particle swarm optimization (PSO) by also considering several operating scenarios. By using the obtained active power reference, the microgrid frequency could be restored within allowable limits in various scenarios with minimum average final frequency deviation after an occurrence of a large disturbance, thus prevent the unnecessary load shedding and improving overall system frequency stability.