The Effect of Load Models on the Taipower System Frequency Declines

• Main Authors: Wei-Chin Chang, 張維欽
• Other Authors: Wen-Shiow Kao
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/03191509681058994895

碩士 === 國立臺北科技大學 === 電機與能源研究所 === 88 === Accurate analysis of power system stability is helpful for reliability of power system operation. Whether a power system is stable depends on the balance between power generation and load demand. Due to the load dependence of voltage and frequency, it is important to describe the adequate load model for accuracy analysis of power system stability. The Taipower system is an isolating power system without any adjacent interconnected power system. Adequate spinning reserve and load shedding strategy help to prevent the frequency decline when some generators outage. The aim of this thesis is to describe the effect of load models on the power system frequency variations. Three kinds of load models: (1) static model, (2) dynamic model (induction motor) and (3) composite model (static and dynamic) are used for estimating the system frequency response coefficient for various load models under limited spinning reserve. The system frequency response coefficient is used to set up the strategy of load shedding. It should be noted that the amount of spinning reserve and the load characteristics are significant on frequency response. It is found that the value of the system frequency response coefficient depends on the load damper and spinning reserve. It is important to take over both the load damper and spinning reserve for setting the load shedding strategy. An adaptive load shedding algorithm under various load characteristics and various amount of spinning reserve is demonstrated. Finally, the evaluation of frequency performance applying various load models and limited spinning reserve under load shedding is also proposed.