On the Influence of Organizational and Technical Measures on the Cascade Evolvement of Accidents in Electric Power Systems with Heterogeneous Parameters

Abstract

The aim of the study is to assess the effect of various organizational and technical measures on the evolvement of emergency cascade processes in electric power systems (EPS) with heterogeneous parameters and to determine the limits of the maximum permissible operation modes. The article presents the results of electrical operation mode calculations in the test configurations of 6, 35, 110, and 500 kV EPS containing 25, 36 and 40 nodes, which illustrate the influence of heterogeneity of the EPS parameters on the evolvement of cascade emergency processes. An approach to taking into account the heterogeneity of EPS parameters in planning and maintaining the EPS operation modes is presented. To enhance the EPS survivability and reduce the risk of cascade emergency processes to occur and evolve, distributed generation facilities of different capacities and FACTS devices were used in the EPS. In addition, power flows were redistributed by changing the loading of existing power plants with different electricity generation costs. The proposed approach was used to analyze the evolvement of a cascade-type system accident that occurred in the EPS of the Republic of Bashkortostan. By using the developed approach, the possibility of cascade emergency processes to occur and evolve can be evaluated in planning and maintaining the EPC operation modes, as well as to develop EPS configuration and operation mode adjustment measures aimed at preventing such emergencies from occurring.