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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA User’s Manual: Advanced Power Server (APS) Model 145 User's Manual 3.5.1.3 Stopping a Grid Connect Group The turbine system can be stopped at any time. In Grid Connect operation, a stop or off command will override any dispatch mode settings, and is stored by the system. The shutdown process includes a cool down period, which can last up to 10 minutes, depending on the operating temperature at shutdown. During the cool down cycle, the power output is reduced and fuel supply is off but the turbine continues to rotate to dissipate excess heat. A restart can be attempted at any time during a cool down period. To stop the turbine in Grid Connect mode, first select the Grid Connect group and send a stop command from the touch screen. Alternately, disable the system to stop the turbines in the group. If the turbine has been configured with a remote start/stop switch, simply set the switch to STOP or OFF to stop the system. To stop the group from the APS touch screen, touch the red STOP icon as described in Control Functions on page 19. Touching the red SYSTEM DISABLE icon will also send a stop command to the group. 3.5.1.4 Grid Connect Power Demand In Grid Connect operation, the turbine system must be commanded to a specific output power level. Each dispatch mode includes a power level setting. Some dispatch modes include automatic output power level changes. Use the APS touch screen to set the power level settings as described in Power Specifications on page 15. In a MultiPac, the Power Demand setting of the APS is used as the Power Demand setting for all Grid Connect turbines in the MultiPac, whether they are configured for load balancing, maximum efficiency, or power setpoint operation. In load balancing mode, each turbine in the MultiPac is commanded to supply an equal fraction of the total power output as specified by the Power Demand setting of the APS. For example, if the Power Demand setting of the APS in a MultiPac of six C200 turbines is 900 kW, the power demand for each turbine would be 150 kW, or 1/6th of the Power Demand setting. For maximum efficiency and power setpoint modes, the power demand is the same, but the load is distributed among the turbines using a different algorithm than that for load balancing. The Power Demand setting for the MultiPac is changeable and viewable from the APS only. A turbine operating as a MultiPac-enabled unit will only display its fractional portion of the total power demand. Also, setting the Power Demand locally of a MultiPac-enabled turbine during MultiPac operation will have no effect. 3.5.2. Stand Alone Operation In Stand Alone operation, the APS provides the capability to synchronize the voltage outputs of the individual turbines such that they share power and current on both a dynamic and steady state basis. One stand-alone turbine serves as an inverter master, passing voltage and frequency signals to all other turbines for synchronization. The inverter master broadcasts synchronization data to the other units over a dedicated communications bus. The APS manages the selection of the inverter master. User interface through the touch screen on the APS consists of commanding the system on or off, and then enabling or disabling the power output. 400026 Rev E (March 2014) Page 26 of 56 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 | Advanced Power Server (APS) Model 145 User's Manual
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