Correcting Current Imbalances in Three-Phase Four-Wire Distribution Systems

<p>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.</p> <p>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.</p>

Name thesis:degree_name

Master of Science in Electrical Engineering (MSEE)

Level thesis:degree_level

Thesis

Year dc:date.available

2016

Author dc:creator

• Jones, Vinson Joseph

Advisor dc:contributor.advisor

• Balda, Juan C.

Contributors dc:contributor

• Mantooth, H. Alan
• McCann, Roy A.

• Applied sciences
• Electric distribution systems
• Negative-sequence currents
• Shunt compensator
• Unbalanced compensation
• Zero-sequence currents
• VLSI and Circuits, Embedded and Hardware Systems

Repository record dc:identifier

https://scholarworks.uark.edu/etd/1576

OAI identifier oai:identifier

oai:scholarworks.uark.edu:etd-3115