Abstract
In recent years, situation awareness and risk mitigation have become the challenging issues in large-scale power grids. This study presents a novel pair-wise relative energy function for real-time transient stability analysis and emergency control. The proposed energy function is able to accurately identify the clusters of critical and non-critical generators significantly faster when compared with previous methods. Additionally, a new emergency control criterion is proposed in order to stabilise the identified critical generators within a comparatively short interval after fault clearance. The emergency control scheme computes the capacity of the requisite generation curtailment using the pre-calculated relative energy of the equivalent post-fault system. Finally, the relative energy oscillation trajectories that occur in the critical cluster are utilised in order to locate the most appropriate generator to launch the emergency control. When compared with the existing methods, it is evident that the novel approach can be applied practically for power systems transient stability analysis and emergency control. The effectiveness of the proposed method is demonstrated and evaluated using the New England 10 machines 39-bus and 16 machines 68-bus systems.
Highlights
Modernisation of power systems is increasing the penetration of renewable power generation resources, as well as deployment of monitoring and measurement infrastructures [1]
It has been shown that the proposed relative energy function of pair-wise generators can provide valuable insights with regard to transient stability analysis and emergency control
The derivation of the method showed that the pair-wise relative energy utilised in this study provides an equivalent measure of post-fault system transient energy to that of the original transient energy function (TEF)
Summary
Modernisation of power systems is increasing the penetration of renewable power generation resources, as well as deployment of monitoring and measurement infrastructures [1]. Disastrous power blackouts [2, 3] alert the system operators that serious consequences, such as out-of-step separation and cascading failures, might occur without having an accurate, rapid and real-time stability analysis and emergency control infrastructure in place. Implementation of such systems offers a second line of defence against such wide spread blackouts. To address the above requirements, a novel pair-wise relative energy function is proposed in this paper, providing a new scheme of fast and real-time transient stability analysis and emergency control. The presented simulation results demonstrate the practical application with regard to power systems transient stability analysis and emergency control
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