The Control of Parallel-Connected Inverters for U.S. Navy Shipboard Applications
Abstract
Concepts such as the Integrated Power System (IPS) and the DC Zonal
Electric Distribution System (DC ZEDS) have motivated the study of power inverter control and
paralleling strategies by the U.S. Navy. For example, in DC ZEDS a Ship Service Inverter Module
(SSIM) converts DC power into AC power for use within a zone. For reasons of redundancy and
logistics, multiple paralleled inverter submodules are used to implement the SSIM. The current effort
supports ongoing SSIM hardware development by the SatCon Corporation. This report documents
the modeling and control analysis of a set of parallel-connected PWM inverters. Although initially
focusing on a static three-phase R-L load, the analysis is extended to three-phase symmetrical
induction machine loads and three-phase round- rotor permanent-magnet synchronous machine
loads. In each case, an algorithm for designing the local inner current control is developed by
employing reference frame theory, replacing the paralleled inverters by an equivalent unit, and
executing a nonlinear pole-placement strategy. Upon reviewing the equations necessary for AC
machine vector control, the report concludes by documenting the analysis and design of a simple speed control loop for this aformentioned machine loads.
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.NPS Report Number
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The control of parallel-connected inverters for U.S. Navy shipboard applications
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