Transient stability preventive control for stable operating condition with desired CCT

Abstract

In recent years, power systems have become larger and more complicated. Deregulation of electric power industries has begun in some countries, and power system operations have become more difficult. However, the stability of the power supply is the most important consideration for customers. Therefore, power system operators should consider not only economic load dispatch but also on-line stability aspects. In this paper, we pay attention to one of the most important transient stability indices [critical clearing time (CCT)] and propose a new transient stability preventive control method using linear relationships between CCTs and generator rotor angles. At first, CCT calculations, as contingency screenings, are carried out to find contingencies that have smaller CCTs than predefined target values. The target values are taken as larger values than the actual circuit breaker operating times in the power system. A preventive control to achieve a more stable power system operating point is carried out by generator output rescheduling and generator terminal voltage control, which are determined using the relationships between CCTs and generator rotor angles. This proposed method is demonstrated using a Japanese standard power system called the IEE of Japan (IEEJ) EAST 10 machine system.

Sustainability from the Occurrence of Critical Dynamic Power System Blackout Determined by Using the Stochastic Event Tree Technique

“…The t c OMIB based OMIB is useful as a standard reference to specify the CCT for all protection relays in a power system consisting with multi-machine or numerous generators. The importance of OMIB via t c OMIB towards the power system operating condition comprising multi-machine or numerous generators has also Sustainability 2017, 9, 941 5 of 17 been discussed and implemented in [24]. Nevertheless, this paper proposes a new approach to analyze the condition of dynamic power system blackout by taking into account the transmission lines and/or generators tripping due to the protection relay operation at the time interval of CCT specified by the t c OMIB based OMIB.…”

Feedforward neural network-based transient stability analysis of electric power systems

“…The updating objective is the minimisation of the classical cost function (14) equal to the sum of the errors on input-output patterns.…”

Comparison of CART- and MLP-based power system transient stability preventive control

“…In the literature, much effort had been made to derive preventive control. In [2], a linear relationship between critical clearing time (CCT) and power generation was deduced. According to the linear relationship, the authors designed the transient stability preventive control by rescheduling generator output and regulating terminal voltages.…”

“…[2][3][4][5] used exquisite mathematical approaches to design power system preventive control. On the other hand, due to the highly nonlinear nature, and also the growing uncertainty and complexity of power systems, researchers resort to soft computing techniques like automatic learning (AL) approaches [6].…”