Research on reliability cost-benefit analysis and optimization for distribution network planning based on multi-measures decomposition

This paper proposes a distribution network reliability cost-benefit analysis and optimization method. When carrying out the distribution network planning to improve the reliability of power supply, through analyzing a variety of major reliability improvement measures, each measure´s reliability cost-benefit analysis curve decomposed can be obtained. Then the curves corresponding to all the measures are combined, and then using the classic power supply reliability cost-benefit analysis theory to develop a reliability optimization strategy considering a variety of measures combination. Using this strategy, the best reliability optimization path of cost-benefit including multi-measures can be selected from the combined curves. The path can be further broken down into the actual investment of each optimization measure, and thus the scale of each measure can be obtained through the investment. Finally considering the actual situation of distribution network, the measures are transformed into some specific projects, and the most economical and reasonable optimization scheme is obtained to achieve a certain improvement of reliability, and realize the efficient control of reliability cost-benefit. This method can optimize the regional distribution network and the individual line. It can optimize the investment based on a given reliability target, and also can optimize the reliability based on a given investment level. Through this method, several typical regional distribution network planning projects of Nanjing city are analyzed and optimized, achieving remarkable economic benefits in practical applications.