Vfd Challenges for Shipboard Electrical Power System Design

An in-depth exploration of shipboard power generation and distribution system design that utilizes variable frequency drives

The variable frequency drive (VFD) application is a proven technology for shore-based applications. However, shore-based VFDs often are unsuitable for shipboard applications because the power generation and distribution fundamentals are completely different. VFD Challenges for Shipboard Electrical Power System Design explores the problems presented by variable frequency drives as they are applied in shipboard power generation and distribution system design and offers solutions for meeting these challenges.

VFDs with configurations such as six pulse drive, 12 pulse drive, 18 pulse drive, active front end, pulse width modulation and many others generate many different levels of harmonics. These harmonics are often much higher than the regulations allow. This book covers a range of techniques used to provide ships with efficient energy that minimizes mechanical and electrical stress. This important book:

• Offers a comparison of shipboard grounding and VFD grounding
• Contains an analysis of the VFD effect in terms of shipboard power quality
• Includes specific examples of Department of Transportation standards regarding VFDs

Written for commercial and naval engineers designing ships and/or shipboard power systems, VFD Challenges for Shipboard Electrical Power System Design is a comprehensive resource that addresses the problems and solutions associated with shipboard applications of VFD.

Mohammed M. Islam is R&D Manager of Applied Science at Northrop Grumman Ship Systems. He has forty-five years of diversified shipboard electrical engineering experience and has played significant roles in every part of new shipbuilding and ship modernization engineering.

Preface ix

About the Author xiii

1 Overview – VFD Motor Controller 1

2 Propulsion System Adjustable Speed Drive 21

3 VFD Motor Controller for Ship Service Auxiliaries 29

4 Shipboard Power System with LVDC and MVDC for AC and DC Application 35

5 Shipboard VFD Application and System Grounding 39

6 Shipboard Power Quality and VFD Effect 69

7 Shipboard Power System FMEA for VFD Motor Controller 85

8 Shipboard VFD Cable Selection, Installation, and Termination 97

9 Ship Smart System Design (S3D) and Digital Twin 117

Appendices 129

Glossary 135

Bibliography 143

Index 145

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