Date of Graduation
5-2016
Document Type
Thesis
Degree Name
Master of Science in Electrical Engineering (MSEE)
Degree Level
Graduate
Department
Electrical Engineering
Advisor
Juan C. Balda
Committee Member
Alan Mantooth
Second Committee Member
Roy McCann
Keywords
Applied sciences, Electric distribution systems, Negative-sequence currents, Shunt compensator, Unbalanced compensation, Zero-sequence currents
Abstract
The objective of this thesis is to present the theory, design, construction, and testing of a proposed solution to unbalanced current loading on three-phase four-wire systems. The Unbalanced Current Static Compensator is the name of the prototype; herein referred to as the UCSC. The purpose of this prototype is to redistribute current between the three phases of a distribution system. Through this redistribution, negative- and zero-sequence currents are eliminated and a balanced system is seen upstream from the point of installation.
The UCSC consists of three separate single-phase H-bridge inverters that all share the same dc-link capacitor. Each of these inverters performs independently using a single-phase rotating reference frame controller. Each either draws or injects current onto the distribution system lines to balance the active currents and performs power factor correction for voltage compensation. A 34.5 kV, 6 MVA system was built and simulated in Matlab/Simulink™ to test the validity of this solution. A scaled-down UCSC prototype was then designed and constructed to compensate for a 208 V, 10 kVA system. Results from both the simulations and testing of this UCSC prototype are presented and analyzed.
Citation
Jones, V. J. (2016). Correcting Current Imbalances in Three-Phase Four-Wire Distribution Systems. Graduate Theses and Dissertations Retrieved from https://scholarworks.uark.edu/etd/1576