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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Grid Connect Operation – Capstone Models C30 and C60/C65 Engine Operating Mode The Model C30 MicroTurbine can be operated in two modes, Power mode or Efficiency mode. Efficiency mode is the factory-installed, everyday control method that applies to most customer applications. In efficiency mode, engine temperature (TET) is regulated based on engine speed to achieve efficiency at all speeds. Power mode is an alternative, reducing TET while increasing engine speed and generator voltage (increased power output) but limiting generator current to protect internal electronics. Although power mode may produce an overall increase in power, this mode would only be used if gas efficiency were not a priority. Capstone recommends ALWAYS keeping the MicroTurbine in efficiency mode, unless otherwise directed by Capstone Technical Support. In older Model C30 systems prior to May 2001, some users experienced a lower power output in efficiency mode due to component limitations. However, this situation has been corrected through improved rotor cooling and the incorporation of new generator inductors. To configure engine operating mode: • Display panel: Navigate as follows: System Data > System Configuration > Engine Mode, and select either Efficiency or Power. • CRMS: From the menu, select Settings > Control Settings, position the Engine Mode toggle switch in the desired position – Efficiency or Power. Reverse Power Flow Protection Reverse Power Flow Protection mode prevents the MicroTurbine system from backfeeding power to the grid and can be enabled in either operating mode. If the MicroTurbine output is greater than the local load demand, the excess power generated by the MicroTurbine will flow back to the grid. Return flow to the grid is undesirable for two reasons: 1) The grid utility does not allow net metering, and requires that generating equipment cease operation if this condition exists, and 2) Reverse power flow represents an economic loss to the MicroTurbine user. Reverse Power Flow Protection may be used independently of other grid connected dispatch modes. The Reverse Power Flow Protection function, when enabled, will initiate a normal shutdown of the MicroTurbine if reverse power flow occurs for a time period set by the user. This allows cooldown of the MicroTurbine to occur as opposed to a Grid Fault warmdown (shutdown) caused by an external disconnect. NOTE Some states have rigid requirements regarding proper reverse power flow to the utility during grid disturbances. In this case, the best approach is to use a proper reverse power flow detection relay to detect reverse power on any phase. The detection relay circuit should interface with one of the MicroTurbine digital fault inputs and be software configured to fault severity level 4 (warmdown). When properly setup, the output contactor on the MicroTurbine will open as soon as the relay detects a reverse power flow condition. 410027 Rev F (February 2006) Page 18 of 23 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | TECH REF C30 Grid Connect Op
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