Reseach on Real-time Scheduling Strategy for Micro-grid Operation in Island Mode Based on the Demand Side Response

Due to micro-grid supplies electricity by itself in island mode, the unbalanced power will be produced. In order to make power supply more economical and reliable, a real-time scheduling strategy based on the demand side response is put forward in this paper. Day-ahead load transfer model, which considers such indexes as load curve smoothness and load transfer cost, is built to smooth the load curve by transferable load at demand-side transfer part. During the operation of micro-grid, the real-time scheduling strategy based on battery three-step charging and discharging is implemented to arrange each controllable micro-source and battery output, which can maintain enough battery charging and discharging margin and cut down the power shortage and power waste. Moreover, the optimal load distribution model is proposed in the dispatch scheme to optimize the output of the controllable micro-source, reduce the micro-grid operation cost. In the end, taking a small micro-grid system as an example, by comparing with the day-ahead planning results without considering the battery depreciation cost, it is shown that the unbalanced power can be reduced under both functions of load curves smoothening by load transfer and the real-time scheduling strategy.