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Initial Startup The UPS Controller reads the stored OFF Timer values for each enabled Hybrid UPS microturbine, and selects which turbines to be turned ON using the highest OFF Timer values first, or if times are the same the lowest microturbine number. The selected microturbines are then started and share the Power Demand equally. Note that each unit is started sequentially. After the first unit reaches load state, the controller will start the next unit and so on. If a particular unit has not reached load state within 5 minutes, the controller will automatically select the next unit with the highest OFF timer. The Generator Output is the basis of this power sharing, and the power to the critical loads is always shared equally among all operating Hybrid UPS microturbines (whether they are in UPS, High Efficiency, or Emergency Mode). Any net excess power from the engines will be exported to the incoming utility bus through its respective Grid connection. MT Rotation Period Calculation The MT Rotation Timer starts whenever the system is commanded into the High Efficiency Dispatch Mode. It resets to zero when the earlier of these two conditions is met: 1. The MT Rotation Period value is reached (in which case the MT Rotation Timer will also restart counting from zero), or 2. The system is commanded to leave the High Efficiency Dispatch Mode (either commanded to the UPS Mode or to the Standby Mode). When the MT Rotation Timer reaches the MT Rotation Period value, the UPS Controller will recalculate which microturbines to stop and start to meet the Power Demand based on each turbine’s ON Timer and OFF Timer values. The engine on the Hybrid UPS microturbine with the highest OFF Timer value will be started. Once this engine transitions into Load State, the engine with the highest ON Timer value will be stopped. If timer values are the same for either OFF or ON calculations, the lowest engine number from the available pool of Hybrid UPS microturbines to be selected from will be used. This monitoring of ON/OFF time is not time critical, and may have a time resolution of up to one minute. Changing Power Demand In order to minimize potential cycling of engines ON and OFF, a system is provided that uses a fixed OFF Delay for stopping units when required by reductions in Power Demand. This delay value is set at 15 minutes. The UPS Controller will react quickly to any change in Power Demand in order to recalculate how many turbines to operate, and to realize the requested power level. 1. For Increased Power Demand – If additional turbines are required to be turned ON, the UPS Controller will make this new calculation as in the Initial Startup section above; that is, it will select the available engine with the highest OFF Timer value to add to the units already operating. Regardless of whether additional engines have been commanded ON or not, the UPS Controller will also adjust the commanded power output to each Hybrid UPS microturbine in High Efficiency mode so that the total output is responsive to an increase in customer Power Demand. Note that each unit is started sequentially. After the first unit reaches load state, the controller will start the next unit and so on. If a particular unit has not reached load state within 5 minutes, the controller will automatically select the next unit with the highest OFF timer. 400028 Rev B (January 2014) Page 15 of 35 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. Capstone Turbine Corporation UPS Controller User’s ManualPDF Image | Hybrid UPS Controller User's Manual
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