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Investigations of the constraints relating to penetration of non-synchronous generation (NSG) in future power systems

Yu, Mengran and Dysko, Adam and Booth, Campbell and Roscoe, Andrew and Zhu, Jiebei and Urdal, Helge (2015) Investigations of the constraints relating to penetration of non-synchronous generation (NSG) in future power systems. In: Sixth Protection, Automation and Control World Conference (PAC World 2015), 2015-06-29 - 2015-07-03, Technology and Innovation Centre, University of Strathclyde.

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According to recent projections, the installed capacity of renewable energy sources and interconnectors will increase significantly in GB power system. With such a large scale of penetration of converter-interfaced renewable energy sources and HVDC interconnectors, the existing power system, which is predominately supplied by synchronous generation presently, will face system operation challenges which are currently attracting the urgent attention of both industry and researchers. Studies have shown that the instantaneous penetration level limit of non-synchronous generation is approximately 65% in the GB power system in context of first swing angular stability and susceptible to a range of factors. There has been a lack of investigation of the individual factors and the degree to which these factors influence the non-synchronous generation limit. While the general term penetration level is often used as an annual average rather than an instantaneous operational value in many papers, it has not been fully defined or a standard definition agreed to date. In this paper, different definitions of penetration level will be introduced and discussed. System operational issues associated with angular stability will be analysed through simulation results. It will also be illustrated that the conventional analysis method for angular stability is not applicable for future power systems with high penetration levels of NSG. Based on a simplified but high-fidelity power system model in Matlab Simulink, the penetration level limit and different factors that have the potential to influence it will be investigated and analysed. It will be shown that the angular stability limits are governed not only by the reduced system inertia, but are also influenced by factors such as system impedance and fault clearing times. Future work will be carried out to explore the penetration level limits based on GB transmission model to give more reliable results as well as to provide guidance for future requirements for generators (in particular from non-synchronous generation) to support system stability.