Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Schulz, Noel
Committee Member
Bastos, L. Jimena
Committee Member
Srivastava, K. Anurag
Date of Degree
12-13-2008
Document Type
Graduate Thesis - Open Access
Major
Electrical Engineering
Degree Name
Master of Science
College
James Worth Bagley College of Engineering
Department
Department of Electrical and Computer Engineering
Abstract
A shipboard power system (SPS) should be stable and reliable in order to ensure that the ship has better fight-through capability and increased fault invulnerability. The protection system is designed to minimize the effects of faults in the SPS, which presents challenges, such as increased fault vulnerability and lack of an electrical ground in the system. If protection devices are not updated after power system reconfiguration, they may not protect the power system appropriately. Therefore the development of elaborate digital protection devices for the SPS is required. This thesis focuses on the model-based methodology for designing a protection scheme for SPS based on instantaneous overcurrent digital relays. To achieve this, an instantaneous overcurrent relay model is first developed in MATLAB/Simulink. Then, the Simulink model is downloaded to the DSP-based platform dSPACE, which runs the Simulink model in real-time, to perform hardware-in-the-loop testing (HIL). Thus, through the dSPACE hardware, the proposed relay model is tested for various fault conditions in three HIL platforms. Different electromagnetic transient real-time digital simulators are used to simulate the SPS, to which protection is provided through the relay modeled in dSPACE. Simulation results from these three HIL platforms demonstrate that the proposed overcurrent relay model was successfully modeled, simulated and tested using various tools for model-based design. Testing results show that the developed model can work with different real-time platforms, and that in contrast to a commercial relay, the developed relay model has increased flexibility because settings such as reclose delay and pickup value can be changed online. This feature can be used to develop an advanced relay model with a dynamic pickup value. An advanced relay model will be useful for the SPS, because such system is subject to topological changes and reconfiguration that are not as prevalent in other types of power systems.
URI
https://hdl.handle.net/11668/15597
Recommended Citation
Zhang, Yujie, "Model-based design of a protection scheme for shipboard power systems" (2008). Theses and Dissertations. 3131.
https://scholarsjunction.msstate.edu/td/3131
Comments
digital relays||overcurrent protection||hardware-in-the-loop||protection schemes||protection systems||shipboard power systems