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Adaptive, Sparse, and Multi-rate LQR Control of an MVDC Shipboard Power System with Constant Power Loads

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Authors
Mills, Adam J.
Ashton, Robert W.
Subjects
MVDC, constant power load (CPL)
hybrid energy storage system (HESS)
linear quadratic regulator (LQR)
adaptive
non-linear
all-electric ships
Advisors
Date of Issue
2017
Date
Publisher
Language
Abstract
The US Navy is pursuing development of all-electric warships. The future all-electric warship is expected to utilize medium-voltage DC (MVDC) main distribution to supply several load zones. The load zones will convert the MVDC power to lower voltage for use by local loads as well as contain local energy storage for casualty back-up power. A majority, if not totality of loads are expected to exhibit constant-power load (CPL) behavior. Voltage instabilities introduced by CPLs and methods to address the problem in multi-machine MVDC systems are reviewed. This paper presents an LQR based, centralized, control scheme to regulate MVDC distribution bus voltage as well as the low-voltage DC (LVDC) service buses through coordinated use of low-bandwidth MVDC voltage sources and high-bandwidth, low-voltage currents sourced from the local energy storage devices. A sparse-feedback, multi-rate LQR controller (LQR-SM) is designed and implemented in MATLAB software using a hypothetical multi-machine, multi-zone shipboard MVDC electric distribution system with CPLs and energy storage devices. The presented control scheme is able to combine and coordinate all available control inputs to effectively regulate MVDC and LVDC buses in the system while allowing for design flexibility not available through existing control schemes
Type
Article
Description
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Department
Electrical and Computer Engineering (ECE)
Other Units
Naval Postgraduate School (U.S.)
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Format
6 p.
Citation
Mills, Adam J., and Robert W. Ashton. "Adaptive, sparse, and multi-rate LQR control of an MVDC shipboard power system with constant power loads." Industrial Technology (ICIT), 2017 IEEE International Conference on. IEEE, 2017.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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