Voltage Stability Analysis of Large-Scale Power Plants

• Main Authors: Chia-Fang Chang, 張嘉舫
• Other Authors: Chao-Rong Chen
• Format: Others
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/f82ejv

碩士 === 國立臺北科技大學 === 電機工程研究所 === 105 === In this thesis,we use PSSⓇE to analyze voltage stability of large-scale power plants. For steady state voltage stability, we can find the voltage collapse point and the maximum transfer power limit value from PV curve, the limit value is also called power margin. We can obtain reactive power of the system in stable operation from QV curve, and determine whether the bus is strong. For transient voltage stability, it will consider the unit dynamic performance and use time domain to simulate dynamic analysis. Voltage stability is an important issue for power systems. Voltage instability will lead to voltage collapse even disintegrate the grid and cause economic losses. In this study, the steady-state voltage stability will simulate the system in three operating conditions, the system normal, N-1 and N-2. The results show that voltage stability margin of N-1 and N-2 case will decrease and more easily cause voltage collapse phenomenon. Transient voltage stability will simulate the case of generator tripping, single-line three-phase short-circuit fault, two-line three-phase short-circuit fault, bus three-phase short-circuit fault. The results show that the suitable protection relays’ setting is important to the system. Finally, this thesis results provide a reference for operater.