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CHAPTER 4 Capstone OPERATING MODES Stand Alone Introduction This section presents information on operating the C200 microturbine in Stand Alone mode. Stand Alone mode allows power generation at locations where there is either no electric utility service or where backup power is desired when the electric utility is unavailable. For Stand Alone operation, the voltage and frequency of the microturbine are set to meet load requirements. The microturbine behaves as a voltage source that always follows the power requirements of the load, (i.e., the output power is determined by the actual current draw demanded by the connected loads). The microturbine in Stand Alone mode utilizes an on-board battery storage system to power connected loads when no electric grid utility is available. The battery provides energy for starting the microturbine. During operation, the battery also provides energy for supporting power draw while the microturbine increases speed to provide the necessary power. In addition, it serves as a buffer to absorb energy during a loss of load while the microturbine decelerates to produce less power. During microturbine shutdown, the battery may be placed in sleep mode to minimize drain and preserve battery charge. Management of the battery and its state-of-charge is automatic during microturbine operation. Features The normal Stand Alone mode of operation is for the microturbine to pick up the connected load at its set voltage and frequency once the microturbine has been started. Stand Alone capabilities also include a Soft Start function, which allows the microturbine to begin exporting power at less than nominal voltage and frequency, and then linearly increases voltage and frequency to nominal levels over a period of time. This Soft Start feature can assist in starting loads with large in-rush currents, such as a single large dedicated motor. To meet output power requirements automatically, the system can be configured in Auto Load mode. Auto Load ensures that the microturbine closes the main output contactor to immediately produce the required output power once minimum engine load speed and battery state of charge are reached. The C200 microturbine includes integrated protective relay functions to check output voltage and frequency, and will shut down if values fall outside of preset limits. The system will also automatically shut down, and will not pick up load, if it senses utility voltage. If the connected loads demand more power than the engine is able to produce, the microturbine will take additional power from its battery storage system to make up the difference until the battery state of charge drops below 60 percent. Power Specifications The full-load power output in Stand Alone mode is three phase 150 to 480 V, 50/60 Hz. The microturbine provides output in L1, L2, L3 counter clockwise phase rotation. For complete performance ratings, refer to Chapter 7: Performance and Chapter 8: Electrical Ratings in this document. For discussion of the protective relay functionality, refer to Chapter 9: Protective Relay Functions. For discussion of electrical interconnections, refer to Chapter 10: Communications and Chapter 12: Installation in this document. 410066 Rev C (June 2009) 4-3 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | CAPSTONE C200 MICROTURBINE TECHNICAL REFERENCE
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