ISSN: 2277-9655 [Hashim* et al., 6(12): December, 2017] Impact Factor: 4.116 IC™ Value: 3.00 CODEN: IJESS7 http: // www.ijesrt.com © International Journal of Engineering Sciences & Research Technology [618] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY FORCE GENERATOR TRIPPING SCHEME USING TRANSIENT STABILITY INDEX, ACCELERATING POWER, AND SIPS H. Hashim 1 , I. Z. Abidin 1 , H. A. A. Rashid 1 , Sheikh Kamar 2 , Nik Sofizan 3 1 Electrical Power Engineering, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM – UNITEN, 43000 Kajang, Selangor, Malaysia 2 Tenaga Nasional Berhad Research 3 Tenaga Nasional Berhad Transmission Engineering DOI: 10.5281/zenodo.1131025 ABSTRACT Upon the occurrence of out-of-step (OOS) phenomena due to severe fault in the system, it is advisable to initiate force generator tripping as soon as possible within a few cycles while maintaining system stability. Due to this requirement, a fast OOS detection method is the most critical criterion. This paper analyses system behavior at selected study area in 790 Bus Test System Network using PSSE software to justify that TSI COI Speed can serve as an indicator to detect OOS at early stage in order to initiate Force Generator Tripping Scheme (FGTS). In this paper, TSI COI Speed and Accelerating Power are used as a new technique to be implemented in FGTS; a complete algorithm is developed that can detect OOS, initiate FGTS, calculate the amount of MW quantum to force trip generator, determine which generator and the most suitable location to force trip generator, evaluate on the effectiveness of FGTS, and initiate contingency action to take if OOS still exists in the system. KEYWORDS: Out-of-Step detection, Force Generator Tripping Scheme, System Integration Protection Schemes, Area-Based Transient Stability Indexes: COI Angle and COI Speed, Accelerating Power. I. INTRODUCTION The existence of dynamic loads in the system will affect rotor angle and speed of generators during steady state and abnormal conditions [1]-[3]. It is important to look into various possible ways to preserve system stability by taking early precaution before the system plunges out of its limiting condition and runs out of synchronism. Anticipating the correct amount of mechanical power when the system is at steady state and when it is subjected to disturbances would minimize supply interruption and hence maintain system stability [4]. Generator can be transiently unstable when there is a large variation of input power either due to sudden increase in the input power to generator or system fault, especially when the system is subjected to severe system fault [5]-[9]. The response of a power system to a disturbance depends on the initial operating state of the system, the severity of the disturbance, the actions of protective relays and other power system controls. Severe fault on power system followed by its isolation from the system will cause variations in its critical parameters such as large separation of generator rotor angles, large swings of power flows, large fluctuations of voltages and currents, and finally loss of synchronism between groups of generators or between connected neighboring utility systems [10]. This unstable power swing can be classified based on the three characteristics of the separation interface tie-lines [11]: first, the active power on these lines crosses zero and oscillates periodically; second, the existence of out-of-step center point on the separation interface, whose voltage fluctuation amplitude is significantly larger than that of other points; last, the reactive power flows into the interior from both sides of the separation interface. .