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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Stand Alone Operation–Capstone Models C30 and C65 4. MultiPac Microturbines can be installed in groups of up to 20 units to operate as a single power generation source. MultiPac capability features a single control point and synchronous voltage and frequency output for all units. Individual microturbines share power and load on both a dynamic and steady state basis. C65 microturbines can be combined in a MultiPac with greater capacity using an Advanced Power Server. Refer to the APS Technical Reference (410079) for details. A MultiPac can be operated in any of three available modes: Stand Alone, Grid Connect or Dual Mode. In each mode, individual microturbines share power, current and load on both a dynamic and steady state basis, and generate current to meet the required load demand. Dual Mode operation requires purchase of an optional Capstone Dual Mode System Controller. In Stand Alone mode, systems will remain in the Run state with their contactors open until enough units are available to meet minimum power capabilities, at which time all output contactors close. If minimum power is not met within MultiPac power time, the units will fault and shut down, preventing prolonged operation with fuel and no power output. 4.1. MultiPac Operation A MultiPac is designed to maximize the combined output power of multiple microturbines. A single physical and logical control point, designated as the master–which can be any turbine in the MultiPac–directs signal and command information to all other turbines in the MultiPac. Synchronous operation of multiple turbines controlled by a central command provides for a continuous power source and redundancy. If an individual turbine shuts down, the remaining units will still continue to function. Microturbines in a MultiPac operate in Load Balancing mode. A start command to the master is propagated to all systems in the MultiPac. All units start and stop as a unit, and the power demand is shared evenly among all units in the MultiPac. For example: For three Model C65 microturbines with a combined power demand of 150 kW, all three start and supply 50 kW. If any turbine, including the master, experiences an operational fault such as a 6012 Fuel Fault, the remaining turbines continue operating, and the inverter master increases the power demand to each of those systems to redistribute the load that the inoperative turbine no longer provides. If the master turbine experiences an electronic failure in which no power exists to the electronics boards, command and control to the remaining turbines in the system will be made unavailable, and all operating turbines will be forced to generate power and retain functional settings at the last commanded values. In this case, each subordinate turbine will still be able to detect, report, and act upon grid protective relay faults such as under/over voltage, anti-islanding and reverse power flow. In other words, microturbine protective relay functionality is non-volatile, fully independent of MultiPac operation and remains operational on each microturbine at all times regardless of the microturbine’s state or condition. Any turbine can be MultiPac disabled to shut it down for repair or standard maintenance and keep the rest of the MultiPac operational. However, if the master needs to be shut down, the entire MultiPac must be shut down, and a new master must be designated to continue MultiPac operation with the remaining turbines. If a Dual Mode System Controller is installed, this wiring will also require relocation to the new master turbine. 410028 Rev E (June 2013) Page 22 of 42 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 | Technical Reference Stand Alone Operation – Capstone Model C30 and C65
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