Reliability evaluation of grid-connected micro-grid considering demand response

The switching in of renewable resources to micro-grids and the implementation of demand response strategy has made reliability evaluation of micro-grid become increasingly complex. This paper focuses on the influence of demand response strategy on micro-grid's reliability. The coordination degree between the micro-grid's new energies and loads can influence micro-grid's reliability and the utilization rate of new resources. Concerning this problem, a load demand response model based on the degree to which the micro-grid's new energies satisfy the load is built. The index of the satisfaction degree is defined. Based on the time period effect of the photovoltaic generating set's contribution and the TOU electricity price strategy, a load demand response model to achieve the maximum satisfaction degree is set up, and is solved by the PSO algorithm. According to the rectified load curve and considering the micro-grid's structure as well as the energy-storage equipment's contribution strategy, a method to evaluate reliability of the grid-connected micro-grid considering demand response is established. The results of the calculation example indicate that the proposed load demand response strategy based on the degree to which the micro-grid's new energies satisfy the load can efficiently improve the reliability of micro-grid.