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2.3.7. Transfer Switch Typically, a transfer switch or other load transfer scheme will be supplied by others to allow power to be fed to the critical loads directly by the Utility bus in case there is a problem with the Hybrid UPS system. Since the Hybrid UPS system will always try to maintain synchronism of its load output to the utility input, a closed transition transfer switch scheme can be used to minimize voltage disturbances to the critical loads. 2.4. Hybrid UPS System Operating Modes The following paragraphs explain the different operating modes of the Capstone Hybrid UPS microturbine and how the system transitions between operating states. 2.4.1. UPS Mode The Hybrid UPS microturbine can take power from a utility grid and make it available to the critical loads through a double power conversion process, similar to the way a traditional UPS operates. The output power to the critical loads is isolated from disturbances on the utility grid, and its power quality is maintained. In UPS Mode, the turbine generator is not operating, and the output power is supplied only by the utility grid input from the GLCM through to the LLCM. The frequency of the output to the critical load is determined by the utility grid, and the phase relationship is maintained between input and output of the Hybrid UPS system. The desired voltage to the critical load is pre-set by the user, and the Hybrid UPS system will attempt to maintain this pre-set value even if utility voltage varies. 2.4.2. High Efficiency Mode The High Efficiency Mode of operation allows the microturbine to generate its own power to supplement the utility grid. The power it generates can be set at more or less than the amount of power the critical loads require, with the utility grid connection automatically taking or giving the difference as required. The system must be actively connected to a stable utility grid source for it to enter the High Efficiency Mode. High Efficiency Mode can therefore be thought of as a special case of UPS Mode, where the turbine has been commanded ON and operates in parallel with the Utility grid. 2.4.3. Emergency Mode The Hybrid UPS system will automatically transition to the Emergency Mode if commanded to operate in either UPS Mode or High Efficiency Mode and utility power is unavailable. Emergency Mode cannot be selected as a desired operating state. In Emergency Mode, power is supplied to the critical load from either the external batteries and/or the turbine generator. An external battery energy source must be available for the system to operate in Emergency Mode. Capstone Turbine Corporation Model C65 Hybrid UPS User’s Manual 400027 Rev B (August 2013) Page 23 of 71 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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