The Coordination Of Economic Dispatch Of Power System With Distributed Generation

Distributed generation increasingly received attention, not only because it improves the reliability of power supply and power quality, but also to meet the rational utilization of energy optimization, and taking into account environmental protection. Coordinated operation of DG and grid is the best way to provide users with reliable and quality electricity, and a comprehensive utilization of existing resources and equipment. The network structure and trends will have great changes, and a great deal impact to the grid scheduling if distribution network access the grid. Therefore, how to find an economical and environmentally friendly scheduling program after distributed generation access to large grid has important theoretical and practical significance.This paper firstly summarized and summed up the impact of distributed generation bringing to the grid, and a numerical examples show the influence of the trend of distributed power generation. On this basis, economic and environmental scheduling model of a photovoltaic power, wind power, micro-turbines and fuel cells and other distributed generation system for distributed generation characteristics is established, the optimal model is based on the economic costs and environmental costs, which is the multi-objective and multi-constraint optimization model. The indirect method and the direct method are proposed for solving the multi-objective problem. The indirect method is using Immune clonal selection algorithm (ICSA) to solve this model after multi-objective into a single target; the direct method is a direct search for optimal solution of multi-objective problems using Elitist Non-dominated Sorting Genetic Algorithm(NSGA-Ⅱ).The numerical examples show the output of24-hour and economic/environmental costs of each period time using two algorithms, and analysis of the impact of distributed power on the grid from the electricity purchased and the total cost. The results showed that:distributed generation can meet part of the load demand. In addition, the cost of a whole day is less when the DG adding in. Therefore, Compared with the traditional grid, DG’access can play a coordinating role.