Masters Theses


"Solid state transformers (SST) are power electronic transformers combined with high-frequency conventional transformers and control circuitry capable of delivering high performance and flexible power control capabilities. This thesis focuses on analyzing the performance of SSTs in a distribution system with photovoltaic (PV) injection. In order to validate the performance of SSTs, average value models are used on the IEEE 34 bus distribution feeder network scaled to 12.47 kV. SST voltage profiles on the load side are analyzed and the unity power factor capabilities are demonstrated. This is followed by the study of voltage profiles on the primary side of the SST. Additionally, distributed energy resources such as PV systems tend to cause power quality issues which are handled using the SST's volt-var control capabilities. In this case, both AC and DC side integration of PV systems in SST is demonstrated. DC side integration is one of the advantages of this type of solid state device.

To compare this system to a conventional distribution system, the IEEE 34 bus system with similar load and PV injection profiles is built using conventional single-phase distribution transformers. By comparing the results of the SST (with AC and DC side PV integration) with a conventional transformer, the performance of the SST can be reviewed. To provide a complete analysis, voltage regulators are redesigned for the scaled IEEE 34 distribution feeder network using PSCAD while mounting conventional transformers, and its comparison is provided. Further, the impacts and performance of SST with PV penetration greater than 100% is studied and its results are presented and contrasted with conventional transformers"--Abstract, page iii.


Crow, Mariesa

Committee Member(s)

Ferdowsi, Mehdi
Shamsi, Pourya


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


Missouri University of Science and Technology

Publication Date

Summer 2017


ix, 49 pages

Note about bibliography

Includes bibliographical references (pages 47-48).


© 2017 Gautham Ashokkumar, All rights reserved.

Document Type

Thesis - Open Access

File Type




Thesis Number

T 11157

Electronic OCLC #