An investigation into spatial and temporal aspects of transient stability in power systems with increasing renewable generation

Abstract

This paper investigates the impact of generator dispatch (dictated by cost) and locational aspects related to renewable generation connection and consequent disconnection of synchronous generation, on transient stability. As conventional synchronous generation (SG) is displaced by power electronic converter interfaced generation (PEC), the transient behaviour of the power system may change significantly due both to the changed power flows resulting from the different locations of renewables compared with thermal plant and the different dynamic characteristics of PEC. This paper uses an AC Optimal Power Flow (OPF) to determine credible, minimum cost dispatches of generation in a test network with increasing penetration of PEC in different locations. It is found that the critical locations of the system can vary significantly with respect to economic dispatch, location of disconnection of SG and location of PEC, highlighting the increasing temporal and spatial change in system dynamic behavior.

Using SHAP Values and Machine Learning to Understand Trends in the Transient Stability Limit

“…The performance of the ML algorithm will be assessed based on five performance metrics. The coefficient of determination (RSQ), mean square error (MSE) and the square root of the mean square of all errors (RMSE) (2)(3)(4).…”

“…The CCT is a measure of the proximity of an operational scenario to the stability boundary for a given fault that captures the full dynamic response of the network and its generation, including converter interfaced devices. The stability limit may vary between operational scenarios and indeed between network locations [3].…”

“…This is particularly notable in the transient stability problem [2]. In [3], the impact of RES is shown to have a widely varying impact on the transient stability boundary (both improvement and deterioration). Trends are often location-specific and depend on several parameters, which is often very complicated to understand.…”

Investigation of Cascading Events in Power Systems with Renewable Generation

“…An AC OPF [12] is solved to determine the dispatch of the SGs using the inbuilt OPF solver function in DIgSILENT Powerfactory. Each SG is allocated either a high, medium or low cost, as in [8], establishing a merit order among the SGs. The objective of the OPF is the minimisation of the total synchronous generation cost, while respecting constraints set by the active and reactive power limits of the generators, the maximum loading of the lines and the bus voltage limits.…”

Identification of Important Locational, Physical and Economic Dimensions in Power System Transient Stability Margin Estimation

“…Indeed, authors in [4] identify both improvements and deteriorations in the stability margin as a result of the connection of RES. Further to this, [5] demonstrates that there can be a shift in the critical fault due to the spatial, temporal and dynamic aspects introduced by RES, emphasising the growing need to closely monitor the stability of power systems and ensure critical contingency lists are updated as required. As the generation mix of power systems change, previous operational expertise may become outdated -driving the need for methods such as the one proposed in this paper.…”