Multi-Rate LQR Control of a Multi-Machine MVDC Shipboard Electric Distribution System with Constant Power Loads
Mills, Adam J.
Ashton, Robert W.
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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. While many papers have developed single-input control schemes to regulate MVDC bus voltage where CPLs are present, multi-input controller schemes have not been explored.This paper presents two implementations of adaptive, multi-rate LQR controllers to regulate system voltages during step load transients. Through coordinated use of switching converter based low-rate DC voltage sources and high-rate energy storage device currents, multi-rate LQR controllers can provide excellent bus regulation by leveraging of all available control input devices. A periodic discrete-time multi-rate LQR controller (LQR-P) is described and compared to a selective-feedback, multi-rate LQR controller (LQR-SM). Both are designed and implemented in MATLAB software using a hypothetical multi-machine, multi-zone shipboard MVDC electric distribution system with CPLs and energy storage devices.
RightsThis 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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