Multi-Rate LQR Control of a Multi-Machine MVDC Shipboard Electric Distribution System with Constant Power Loads
Mills, Adam J.
Ashton, Robert W.
MetadataShow full item record
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.
Showing items related by title, author, creator and subject.
Howard, Gilbert Thoreau (Monterey, California. Naval Postgraduate School, 1971-01); NPS55HK71011AA formulation is given for minimizing the expected total number of shortages in a multi-item inventory system under a continuous review policy. The variable reorder levels and order quantities must be set to meet constraints ...
Brown, Gerald G. (Monterey, California. Naval Postgraduate School, 2004-07-19);As an operations researcher (OR), sooner or later you will be expected to write a technical publication. The following exposes and clarifies what will be expected of you as an OR, and what you should expect from yourself. ...
Turksoyu, Faith (2001-03);Traffic modeling is an important component of the design of any communication network. This is even more crucial emerging networks, which are expected to operate in high speed and high bandwidth environments. As the design ...