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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes 1. Introduction This report describes tests of the behavior of two microturbine generators (MTGs) under three different transient operating conditions: one MTG in “grid-connect” mode; one stand-alone MTG with load banks; and two MTGs running in parallel with load banks. Tests were conducted on both the Capstone 30-kW and Honeywell Parallon 75-kW MTGs. For the grid-connect mode, several test runs were conducted with set-points changed up and down, and a start up and shutdown were recorded for each MTG. In the stand-alone mode, load changes were initiated by stepping load-bank values (both watts and VARs) up and down. For the parallel mode, tests involved stepping the load-bank settings up and down for the stand-alone unit as well as stepping the MTG running in grid-connect mode up and down. The testing focused on the behavior of the MTGs during changes in load settings in both grid- connect and stand-alone modes. The tests also delineate the behavior of the MTGs’ power electronics. Data from these tests can be used to evaluate the slow dynamic behavior of MTGs and to create models that could be used in system simulation studies. These test results will be incorporated into current studies of distribution system impacts and of the microgrid concept. MTG behavior was also assessed during start up and shutdown. Start-up and shutdown times could be of importance if MTGs units were used for grid support or in microgrids. Parallel tests with two MTGs were performed to assess interactions between the units. One concern that has been expressed about the widespread use of MTGs is that these generators might have instabilities that would cause problems with neighboring units or other power electronic devices such as adjustable speed drives. Close observation of the operation of MTGs in parallel operation was intended to identify any such potential problems. These tests were done using a specific hardware configuration and software version for each MTG available at the UCI test site. Use of different software and hardware could result in different performance characteristics for the same units. 1PDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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