Control for Island Power Systems by Generator Re-dispatch, BESS, DLC, and EDRP-based Strategies

• Main Authors: Tang, Kuo-Ting, 唐國庭
• Other Authors: Wu, Yuan-Kang
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/j326m7

碩士 === 國立中正大學 === 電機工程研究所 === 107 === This thesis develops an underfrequency control strategy for island power systems. First, the proposed control strategy uses the frequency nadir forecasting module to analyze the frequency stability under largest diesel generator tripping (N-1) contingency events. If predicted frequency nadir is too low, four frequency support methods are then analyzed and used for solving potential frequency stability problem. They include generator re-dispatch (GR), the use of battery energy storage system (BESS), direct load control (DLC), and emergency demand response program (EDRP). In terms of the GR method, the optimal diesel generator dispatch is obtained, with sufficient frequency stability and minimal fuel cost and start-up cost. In the BESS method, the optimal instantaneous power output from BESS is obtained based on its frequency support capability. With the DLC and EDRP method, the optimal contract-based load-shedding and load-reduction to provide frequency support are obtained, respectively. Then, the operating costs and capacity requirements of each method to support frequency are analyzed. The research methods and simulation results are very useful to the low-frequency protection of actual power systems.