Določanje lokacije izvora elektromehanske motnje v velikih elektroenergetskih sistemih

OSOLIN, MAJ (author), Rudež, Urban (mentor)

V tem magistrskem delu smo predstavili širjenje elektromehanske motnje v elektroenergetskem sistemu. Različne topologije omrežja smo modelirali z zbiralkami, na katere so preko tranzientne reaktance priključeni generatorji z vztrajnostjo, zbiralke pa smo med seboj povezali z vodi z reaktanco. Nihajne enačbe generatorjev smo linealizirali v okolici delovnih točk ter ustvarili sistem linearnih diferencialnih enačb prvega reda, ki za vektor spremenljivk stanja in njihove odvode izračuna vrednost v naslednjem ali prejšnjem trenutku. Širjenje motnje in njen odboj na fizičnem robu omrežja sta bila v skladu s pričakovanji. Pri simulaciji v inverznem času se motnja rekonstruira v mestu njenega nastanka, prav tako lokator motnje kot njen izvor poda pravi generator. Pri večanju reaktanc na vodih, ki povezujejo zbiralke, ali vztrajnostnih konstant generatorjev se hitrost širjenja elektromehanske motnje po omrežju zmanjša. Simulacije motenj v inverznem času za zazankani model in razvejan model EES(elektroenergetski sistem) za časovno oddaljenost izvora motnje t=2s pravilno locirajo izvor motnje za 10% negotovost poznavanja reaktanc vodov in 5% negotovost poznavanja vztrajnostnih konstant generatorjev. Z ustvarjenim orodjem lahko simuliramo motnjo na poljubni topologiji omrežja in analiziramo vpliv parametrov omrežja in njegove topologije na širjenje motnje. Prav tako lahko analiziramo vpliv parametrov omrežja in topologije na rekonstrukcijo motnje in lociranje mesta izvora motnje s simulacijo v inverznem času.

• Language: Slovenian
• Keywords: elektromehanska motnja, simulacija, lokator motnje, inverzni čas
• Work type: Master's thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2016
• PID: 20.500.12556/RUL-85014
• Publication date in RUL: 09.09.2016

Secondary language

• Language: English
• Title: Localization of electromechanical disturbance in large electric power systems

Abstract

The aim of this thesis was to investigate electromechanical wave propagation in power systems. Different electrical grid topologies have been modeled where buses are connected with other buses with lines modeled as reaktance. Each bus is also connected to generator with transient reactance and inertia constant. Generator swing equations have been linearized at operating points and a system of first order linear differencial equations has been created. Using these equations we can calculate the values of state variable and their derivatives for the next or previous moment. Electromechanical wave propagation and reflection on the physical enges of the grid were in line with expectations. Using inverse time simulation fault reconstruction can be observed. Fault locator identifies the correct generator as a source of disturbance. Increasing either line reactance or inertia constant of the generators resaults in decrease of electromechanical wave propagation speed. Inverse time simulation for intermeshed and branched power systems has been conducted. For fault time distance of t=2s, reactance uncertainty of 10% and generator inertia constant uncertainty of 5% fault location source can be identified. Using the created simulator various different grid topologies can be simulated and impact of different grid parameters on electromechanical wave propagation can be identified. The impact of grid topology and parameters on inverse time reconstruction and fault location accuracy can also be analysed.

• Keywords: electromechanical oscillations, simulation, fault location, inverse time