DC Zonal Ship Power System

Simulation and Visualization

Wenzhong Gao

Dept of Electrical & Computer EngineeringUniversity of South Carolina

Columbia, SC 29208

July 17-18, 2002

VTB Annual Review 2002

Presentation Outline

• Introduction

• DC Zonal System Configuration

• Matlab/Simulink Controller Model

• Simulation Results

• Simulation Demonstration

Introduction

• Maximum protection (isolating faults)Maximum protection (isolating faults)

• Cost savings (cabling reduction, elimination Cost savings (cabling reduction, elimination of distribution transformers and switchgear)of distribution transformers and switchgear)

• Improved efficiency (variable speed control for induction motors)

• Flexibility (ready inclusion of PEBB devices)

The advantages of a DC Zonal ship power system

V1

V2

PORT BUS A

PORT BUS B

BUS 1 BUS 2 BUS 3

BUS 4 BUS 5 BUS 6

TIE 1 TIE 2

TIE 3 TIE 4

SSCM 1 SSCM 2 SSCM 3

SSCM 4SSCM 5 SSCM 6

1 2 3

SS

CM

Sta

tus

Tie

Con

trol

VoltageSetpoint

Matlab/SimulinkSupervisory Controller

Matlab/SimulinkSupervisory Controller

SS

CM

Sta

tus

Tie

Con

trol

VoltageSetpoint

Normal Condition

BUS 1BUS 2

BUS 3

BUS 4BUS 5

BUS 6

SSCM 1 Failure

SSCM 1, 4, 5, 6 Failures

SSCM 2 Failure

SSCM 3

SSCM 1

Nominal duty ratios

Duty ratios(SSCM2 failure)

Nominal duty ratios

BUS 3

BUS 2

BUS 1

Converter Voltages

Converter 2 Voltage

During SSCM2 failure

BUS A Current

Nominal Nominal

11 1

Converter Currents

2

2 2

3

3 3

Conclusions

VTB is a useful tool for modeling, VTB is a useful tool for modeling, simulation, and rapid prototyping of simulation, and rapid prototyping of shipboard DC Zonal power system.shipboard DC Zonal power system.

VTB supports MATLAB/Simulink VTB supports MATLAB/Simulink models for advanced control functions.models for advanced control functions.

The advanced visualization capability The advanced visualization capability is advantageous for comprehending is advantageous for comprehending simulation data and ship’s personnel simulation data and ship’s personnel training.training.

Future Work

Inclusion of prime mover - generator Inclusion of prime mover - generator - rectifier- rectifier

Hierarchical DC Zone: DC-AC Hierarchical DC Zone: DC-AC inverters, motor loads, etcinverters, motor loads, etc

Load shedding control: disconnecting Load shedding control: disconnecting lower priority loads under loss of lower priority loads under loss of generation capacitygeneration capacity

DC distribution stability study DC distribution stability study

Questions

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