Date of Award

Spring 1-1-2014

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Electrical, Computer & Energy Engineering

First Advisor

Dragan Maksimovic

Second Advisor

Annabelle Pratt

Third Advisor

Robert Erickson

Fourth Advisor

Garrett Moddel

Fifth Advisor

Yoash Levron

Abstract

The growth and diversification of the electric utility grid has required the expanded use of compensation devices. One class of compensation devices of interest are distributed static series compensators (DSSCs). DSSCs are power electronics devices that can inject positive or negative reactive impedance into a transmission line by connecting to it in series through a transformer suspended from the line. This thesis addresses the deployment, performance, and design of DSSCs. In order to analyze the impact of DSSCs on a transmission network, a method for linearizing the network is presented. The linearized network model allows the relationships between the network operating points and the injected reactances to be easily derived, thereby illuminating how best to deploy DSSCs. The model, which is general and applies to arbitrarily complex systems, is further simplified into a proposed new form called "line efficacy," which provides additional insights without knowledge of the system topology or operating state. This thesis additionally proposes an advanced design for DSSCs, allowing them to improve upon the compensation performance requirements given by the linearized transmission system model. The advanced design is an alternative method for controlling the inverter stage of active DSSCs. It is shown that three-level, constant duty cycle switching increases the energy available from the inverter dc-side capacitor and thus the magnitude of injected reactance, compared to traditional, sinusoidally modulated three-level switching. These results are validated on a 5kVA single-phase inverter implemented in hardware. Both the design and experimental results are presented in detail.

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