A high-precision real-time approach to calculate closest unstable equilibrium points

作者：Jahromi Mehdi Zareian; Kouhsari Shahram Montaser^*

来源：International Journal of Electrical Power & Energy Systems, 2017, 89: 82-93.

DOI：10.1016/j.ijepes.2017.01.011

• Unstable equilibrium point
• Transient stability
• Equal area criterion
• Corrected kinetic energy

In this paper, an innovative real-time approach is presented in order to compute the closest unstable equilibrium points of system. The proposed approach estimates unstable equilibrium points of system at the first time step of fault duration and there is no need to post the fault data. To such aim, a new concept of equal area criteria is proposed in this paper which estimates the initial value of critical points of the system. This value is used in order to calculate corrected kinetic energy and as a result the closest unstable equilibrium point by taking into account the fault trajectory, Moreover, the details of power system are considered to calculate unstable equilibrium point by utilizing network preserving model. Finally, several case studies have been conducted on IEEE 9 bus and the New-England 39 bus test systems to illustrate the benefits of the proposed approach. It is worth noting that considering structure preserving in modeling and at the same time simplicity in implementation and low computational burden are the main salient features of the proposed approach. As a result, the proposed method is suitable for real-time applications.

• 出版日期2017-7