Voltage-based backup protection and protection performance analysis using wide-area PMU data

  • Fangzhu Yu

Student thesis: Doctoral Thesis

Abstract

This dissertation describes a system that analyses and summarises the operation of protection and provides backup protection functionality, using only voltage data from PMUs and wide-area communications infrastructure. The ability to rapidly identify the presence of faults, their locations and the presence of protection/circuit breaker failures, solely from voltage measurements, is the overarching contribution from this work. The scheme can operate in addition to existing backup schemes to provide a further, or alternative, relatively inexpensive, effective, simple, fast, wide-area backup protection to improve the resilience of power systems. Methods of power system model simplification for different types of fault have also been developed for establishing the capabilities and voltage thresholds of the scheme, and this simplification method is also claimed as a contribution arising from the work. It is shown how the system can operate for a wide range of fault levels, types and resistances { thereby addressing one of the key challenges for protection associated with concerns over protection in the context of reducing and more variable fault levels in future power systems.To validate the developed scheme, case studies assessing scheme performance in several scenarios are presented. Variations of fault resistance, time of fault occurrence, fault location, and fault levels are simulated in Matlab (Simscape Power Systems) using the well-established and accepted IEEE 14-bus network.Hardware in the loop tests are also conducted using an RTDS and actual PMU devices to test and validate the performance of the scheme and to demonstrate its ability to operate using actual hardware and in real time. Applicability of the developed system to large-scale power networks is also demonstrated. It is shown that the scheme is suited to interconnected power systems, and can operate with both reduced fault levels and for different types of faults with high resistances.Future work and suggestions for extensions to the developed system are also presented.
Date of Award10 May 2019
Original languageEnglish
Awarding Institution
  • University Of Strathclyde
SponsorsUniversity of Strathclyde
SupervisorCampbell Booth (Supervisor) & Adam Dysko (Supervisor)

Cite this

'