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Chena Geothermal Power Plant Project Final Report Prepared for the Alaska Energy Authority January, 2007 10. MODIFICATION TO EXISTING ELECTRIC INFRASTRUCTURE AND HOOKUP TO UPS SYSTEM One of the major project challenges has been upgrading an aging diesel generator plant and marginal power distribution infrastructure to permit installation of the geothermal power plant modules. Modifications to the exiting electric infrastructure began almost a year prior to the installation of the first ORC module. 10.1 Battery Bank and UPS System One specific challenge was how to allow the geothermal modules, which generate power via induction generators and thus requires grid support to provide a stable input voltage and frequency for startup, to operate as stand alone generation. This was accomplished through the installation of a 3MW UPS system. The 480V inverter which is part of the UPS system can provide voltage and frequency to the induction generator as it extracts current. This type of system, with batteries for startup and load balancing, allows for the grid-independent operation required by Chena Power. An additional benefit of the UPS system was that it allows seamless power production from multiple sources (primarily the ORC units and the paralleled diesel generators) to smoothly and continually provide power to the site, via the inverters which are part of the UPS system. The battery bank and UPS system were purchased and moved onsite in June, 2005. The manufacturer of the system is MGE, and the model is the EPS 6000 UPS Module. The system has been installed in four Conex units and was hooked to the Chena Power grid as scheduled in November 2005 under the supervision of an MGE representative. 10.2 Diesel Generator Upgrades In preparation for the installation of the ORC geothermal power plant, the three existing generators for Chena Power were paralleled. Originally, the generators were configured in series with only one of the three Caterpillar 3306 200kW providing grid power at any one time. Paralleling the existing generators was necessary for a number of reasons. The ORC geothermal power plant will have some parasitic load associated with it, due primarily to pumps for the hot water supply and reinjection system. Internal system loads are accounted for and the net output of each unit will be 200kW, however the grid requirement will almost certainly average over 200kWhr once the geothermal plant is on line. Therefore, parallel operation will be required during high load time periods. When the ORC units are online, they will take the place of the paralleled generators. The existing diesel generators will remain in place and paralleled with the ORC units through the UPS system to provide emergency backup. In late December, 2005, Chena Power purchased a new 3456 Caterpillar Generator (455EKW, 480V) to supplement the existing 200kW 3306 Caterpillar Gensets. While this is not directly related to the geothermal power plant project, it was necessary to increase fuel efficiency for the diesel power generation and replace the aging 3306 Gensets. 32PDF Image | 400kW Geothermal Power Plant at Chena Hot Springs
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