A Unified Approach to Transient Stability Contingency Filtering, Ranking, and Assessment

Abstract

Abstract-This paper proposes a unified approach to contingency filtering, ranking and assessment in power system transient stability studies. The approach consists of two-block techniques in which the first block selects from a list of contingencies the a priori "interesting" ones, that the second block ranks and assesses. This Filtering, Ranking and Assessment (FILTRA) approach relies on SIME (for SIngle Machine Equivalent). SIME is a hybrid direct-time-domain stability method which combines accuracy and flexibility skills of time-domain methods with sound additional possibilities of direct methods. The FILTRA approach is fully general: it may adapt itself to the specifics of any power system (modeling, protection characteristics, etc.), any contingency scenario and mode of (in)stability (first-or multi-swing, local or inter-area mode) and any application context (planning, operation planning and real-time operation). The approach is illustrated on two EHV power systems, having different structures, control and protective devices. The adequacy of its filtering and ranking capabilities is illustrated in terms of performance criteria such as reliability (ability to consistently capture all dangerous contingencies), effectiveness (ability to avoid false alarms) and computational efficiency (ability to comply with real-time requirements). Further, the assessment task is shown to provide the operator with sound information and effective means of control.Index Terms-Contingency filtering and ranking, dynamic security assessment, power system transient stability assessment and control, SIME method.

Providing Transient Stability by Excitation System Response Improvement Methods through Long Term Contracts

“…Then contingency screening is carried out in the improved network to separate stable from unstable contingencies. Contingency screening is performed using SIME described in [22]. In this method, TDS is carried out for the system and, then, its results are utilized by SIME in order to evaluate the stability condition of contingencies.…”

“…In order to investigate the transient stability of the network in case of single contingency, the method described in [22] is used to screen the contingencies. Therefore, only the events, which lead networks to instability, are examined.…”

Generator‐based threshold for transient stability assessment

“…The IEEAC method represents a specific form of the more generalised transient stability assessment approach called the single machine equivalent (SIME) [24,35,36]. The SIME is a hybrid direct-time-domain method, which relies on a time-domain programme to convert the trajectories of a multi-machine system into the trajectory of an OMIB equivalent.…”

Feature Extraction-Based Real-Time Transient Stability Analysis

“…Hybrid methods resemble direct methods by using energy functions, but the input data consists of measurements taken during and immediately after the fault. Determining the generators that are likely to go out of step during a fault is an important task in SIME methods [5,9,10,11], with approaches such as Preventive SIME and Emergency SIME being applied [6]. Several papers have focused on energy functions for power systems property description [12][13][14][15].…”