Jimena L. Bastos

Modeling and Testing of Protection Devices for SPS using MATLAB/Simulink and VTB

For both terrestrial and shipboard power systems (SPS), a protection system is essential to minimize the effects of faults in the system. SPS present challenges, such as increased fault vulnerability and lack of electrical ground in the system. For this reason, protection devices such as digital relays have to be designed such that the whole SPS protection system ensures the reliability and survivability of the electric ship. The development of elaborate digital protection devices requires appropriate tools for modeling, simulation, and testing. This paper explores the application of two software tools in protective relay modeling, simulation and testing. The first software tool is MATLAB/simulink and the second is the virtual test bed (VTB). An instantaneous overcurrent relay model has been developed using both software tools. To test this model, a transmission line protection application has been developed. In MATLAB/simulink, the proposed overcurrent relay model has been tested for fault conditions applied on a simple power system. The same test is replicated in VTB. Future work includes the implementation of the proposed overcurrent relay model on a hardware platform (dSPACE controller board) to perform hardware-in-the-loop (HIL) testing using a real-time simulation platform, such as the real-time extension of VTB, VTB-RT.

Distributed Simulation Applied to Shipboard Power Systems

The development of shipboard power systems for the new generation of all-electric ships is challenging in two aspects. First, all new equipment needs to be tested before being installed onboard; otherwise, the design and testing process would become increasingly costly and risky. Second, the complexity of a shipboard power system demands the use of significant computational resources for detailed computer-aided analysis. Distributed simulation techniques can help reduce the computational load that simulation of shipboard power systems requires by partitioning the system into smaller, more manageable subsystems. Distributed simulation can also facilitate remote testing of equipment and collaboration among research teams located in geographically distant institutions. The initial step in distributed simulation requires achieving software-to-software communication over a network. This paper outlines the progress done at the Mississippi State University in the distributed simulation application to shipboard power systems. Both natural and signal coupling models for distributed simulation are developed and validated. For natural coupling, a general coupling method, which considers transmission lines as suitable decoupling points, is proposed. Distributed simulation tests on several systems, including a shipboard power system, are documented and simulation results demonstrate the feasibility of applying distributed simulation techniques in advanced shipboard modeling and simulation.

AC/DC Power System Modeling and Analysis for Shipboard Applications

This presentation will discuss Mississippi State Universitys (MSU) efforts over the last five years to develop models and simulations for different applications of shipboard AC/DC power systems. The MSU research team is part of the Electric Ship Research Development and Consortium (ESRDC) and has been involved with research work related to modeling and simulation, protection, reconfiguration, stability, and power electronics of AC/DC shipboard power systems (SPS).

Intelligent methods for reconfiguration of terrestrial and shipboard power systems

Increased reliability issues for terrestrial power systems are pushing more and more animation down to the distribution system. Additionally shipboard power systems have reconfiguration requirements to meet survivability and fight through capabilities. In each of these cases intelligent systems provide a solution for developing reconfiguration algorithms at the distribution level. While the objectives for two systems may be different, there is overlap. Additionally the terrestrial power systems have established IEEE test cases that provide a platform for verifying algorithm development. This panel summary will discuss efforts at Mississippi State University to use intelligent system techniques for distribution reconfiguration. Our research team has applications of multi-agent systems[2-10], genetic algorithms[11-13] and particle swarm optimization [12] and for different aspects of reconfiguration for both terrestrial and shipboard power systems. The various techniques and their results will be compared. Also several different types systems related to shipboard power systems will be introduced.

Shipboard Power Systems Research Activities at Mississippi State University

The future all-electric ship platform is providing a new set of research and development activities related to the electric power system. In order to design, build, and operate the ship effectively, tools must be developed that allow for modeling, simulation and analysis of individual parts of the shipboard power system as well as integration of the power system as a whole. This paper reports on activities at Mississippi State University related to modeling and simulation of shipboard power systems in the area of power system analysis, power electronic analysis and integration, and material modeling and testing.

Model-based design of a protection scheme for shipboard power systems

The focus of this paper is the design and implementation of an advanced protection scheme for shipboard power systems (SPS) using model- or simulation-based techniques. An overcurrent scheme has been adopted as proof-of-concept application. By designing a model and hardware prototype, advanced adaptive protection schemes can be developed. The protection system is designed to minimize the effects of faults on the SPS, which presents challenges, such as increased fault vulnerability and lack of an electrical ground in the system. The development of elaborate digital protection devices for SPS requires appropriate tools for modeling, simulation, and testing. Different software and hardware prototyping tools were used in the present work. First, MATLAB/Simulink was used to model the whole system including the protective device. The Virtual Test Bed (VTB) and RSCAD (RTDS software package) were used to model the entire system for comparison purposes. The power system was then modeled using an electromagnetic transient real-time simulator such as RSCAD or VTB-RT. The protective device was thoroughly modeled in MATLAB/Simulink and then downloaded to a dSPACE controller board, which was interfaced with one of the real-time simulator to perform the corresponding hardware-in-the-loop (HIL) tests. The results of these HIL tests were then compared to similar tests using a commercial protective device, the SEL-351-S relay.