Study On Capacity Credit Of Wind Power Generation

The output of intermittent generation is variable, random and cyclic. With the rapid growth of development scale, the method of taking intermittent generation into electric power and energy balance, is becoming a key problem related to the stable, reliable and economic operation of power system. Make the wind energy into high quality power supply, need to change the wind farm replace conventional power operation capacity and installed capacity, which requires accurate evaluation of wind farm reliability. Now, there is not a unified measure in identify wind farm reliability capacity. Because of the intermittent characteristic of wind, the method of identified conventional power capacity cannot be used to determine the wind farm capacity. Hence, it is necessary to do some researches, according to the characteristics of intermittent generation and the features of grid operation.Firstly, this paper summarizes the basic concept and evaluation indices of capacity credit, recommends an index suitable for power network of China at present stage according to comparison, and analyzes the status situation and development trend of capacity credit. Then, based on risk assessment theory, calculation method of capacity credit for intermittent generation, with detailed calculation model and flow, is proposed. The correctness and effectiveness of this method are proved through an example. With this method, the influence of resource characteristics are analyzed, from the aspects of capacity factor, correlation between intermittent generation output and load, and penetration level. Finally, this paper explores the methods for analyzing the influence of capacity credit on system safe risk. The results of the study can provide theory and methods foundation for intermittent generation planning.