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Capstone Turbine Corporation Model C65 Hybrid UPS User’s Manual 2.3.2. Load LCM (LLCM) The LLCM takes power from the internal 760 VDC bus to the customer’s critical load. The LLCM is unidirectional, and power will only flow from the internal DC bus to the critical load. It will maintain the frequency and phase angle of its output to match the utility grid voltage sensed by the GLCM whenever the utility voltage is stable, and will revert to a preset frequency when the utility voltage is unavailable. The LLCM will provide a preset voltage output to power the critical loads. Protective relay functions are also integrated into the LLCM to protect against disturbances on the load output. 2.3.3. Battery Control Module (BCM) The BCM converts the battery string voltage to the internal 760 VDC. It is able to import full power to the Hybrid UPS system from an external energy storage system (typically a battery string), and can also export power to an individual energy storage system connected to only one microturbine for recharging. 2.3.4. Battery String The battery string can be a battery bank or other energy storage system, either supplied by Capstone or the customer. It will typically be sized for at least 15 minutes of full power capability so that it can provide power to the protected load while a non-operating turbine generator is started. The Hybrid UPS microturbine must be connected to an external battery or other storage system which provides energy for microturbine startup when disconnected from the electric utility grid, and which provides temporary power when utility power suddenly becomes unavailable. A separate battery management and charging system must be provided. The Hybrid UPS system will not provide any battery management, condition monitoring, or charging. An indication of battery state of charge must be provided through the UPS Controller. Contact Capstone for application guidance. 2.3.5. Engine Control Module (ECM) The ECM connects the high speed turbine generator output to the internal 760 VDC bus. It is bi-directional, and power is taken from the DC bus to start the turbine. During operation, the turbine generator speed is independent from the utility input or load output frequencies. The ECM includes all the logic for operating the turbine generator, as well as resistive energy dissipation capability to absorb turbine power in case of sudden load loss. 2.3.6. Turbine Generator In the Hybrid UPS microturbine, the turbine generator operates during high efficiency mode and emergency mode. (Refer to paragraph 2.4 below for a description of the Hybrid UPS operating modes.) While operating, the turbine generator uses fuel input to create useful high-frequency AC electrical output, which is converted by the ECM to DC for distribution to the remainder of the Hybrid UPS system. Power from the turbine is used for the critical load output, with any excess going back through the GLCM to the utility grid and/or through the BCM to recharge the batteries. Page 22 of 71 400027 Rev B (August 2013) 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 MicroTurbine Model C65 Hybrid UPS User's Manual
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