Abstract

The energy storage system in microgrid usually adopts droop control strategy. When the diesel engine is connected to the grid, the operation power of the microgrid will change in a short time, and the operation mode of the energy storage power converter will also respond to the change. At this time, the traditional droop control cannot well adapt to it. The objective of this paper is to propose a droop control strategy with amplitude limiting function to improve the system operation stability after diesel engine is connected to the grid, avoiding the system transient impact caused by the operation mode switching of energy storage system. Firstly, this paper introduces the proposed amplitude limiting droop control strategy. Then, a simulation model based on Simulink is build, and simulation is carried out. The simulation results show that the proposed control strategy does not need to consider the switching time synchronization between bidirectional ACDC control strategy and energy storage charge discharge control strategy. In case of unexpected failure and sudden exit of diesel generator during battery charging, its control mode will automatically switch to droop constant voltage mode, which can still maintain the stable operation of the system.

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