Application of Genetic Algorithm on Optmal Protection Coordination of Closed Loop Radial Systems

• Main Authors: Ching-Ming Chang, 張景閔
• Other Authors: 蔡孟伸
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/watm7s

碩士 === 國立臺北科技大學 === 自動化科技研究所 === 95 === The aim of this thisis is to utilize Genetic Algorithm (GA) for closed loop distribution system protective relay setting. The closed loop distribution system provides higher reliability than radial structure. However, the construction costs and relay setting of closed loop distribution systems are more complex than radial structure. In the urban area of Taipei city, most of distribution system feeders are under-ground. However, the structure remains radial. Some of the feeders are now re-configured to closed loop system in order to provide higher reliability to high technology industrial. Since most of feeders in the distribution systems of Taiwan power Company remain in radial structure, this thesis uses Hu-Lin secondary substation as a study example feeder system. The GA is used to find the setting of protective relays settings. The objective of the problem is to evenly distribute the coordinate curves between the allowable coordination ranges. The results provided by GA are the relay settings which satisfies the all constraints. Based on the results of GA, a set of coordination setting is provided to the engineer for reference. Since the closed loop distribution systems provides higher reliability to the customers, it can be seen that in the near future, many high technology companies will migrate their existing systems to closed loop system in order to provide reliable power sourcs. The results of this thesis provide a new methodology to the field engineers so they can evaluate the pros and cons of the closed loop system to their applications.