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A descriptive approach for power system stability and security assessment

By A. G. Tikdari, Hassan Bevrani and Gerard Ledwich

Abstract

Power system dynamic analysis and security assessment are becoming more significant today due to increases in size and complexity from restructuring, emerging new uncertainties, integration of renewable energy sources, distributed generation, and micro grids. Precise modelling of all contributed elements/devices, understanding interactions in detail, and observing hidden dynamics using existing analysis tools/theorems are difficult, and even impossible. In this chapter, the power system is considered as a continuum and the propagated electomechanical waves initiated by faults and other random events are studied to provide a new scheme for stability investigation of a large dimensional system. For this purpose, the measured electrical indices (such as rotor angle and bus voltage) following a fault in different points among the network are used, and the behaviour of the propagated waves through the lines, nodes, and buses is analyzed. The impact of weak transmission links on a progressive electromechanical wave using energy function concept is addressed. It is also emphasized that determining severity of a disturbance/contingency accurately, without considering the related electromechanical waves, hidden dynamics, and their properties is not secure enough. Considering these phenomena takes heavy and time consuming calculation, which is not suitable for online stability assessment problems. However, using a continuum model for a power system reduces the burden of complex calculation

Topics: 090607 Power and Energy Systems Engineering (excl. Renewable Power), Power system dynamic analysis, Power system emergency framework, Electromechanical wave propagation
Publisher: IGI Global
Year: 2011
DOI identifier: 10.4018/978-1-61350-138-2.ch010
OAI identifier: oai:eprints.qut.edu.au:48122
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