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CHAPTER 4 Capstone OPERATING MODES CHAPTER 4: OPERATING MODES This section describes the Grid Connect and Stand Alone operating modes, including transitions between these operating modes, MultiPac operation, and Dispatch modes. Grid Connect Introduction Grid Connect mode allows the microturbine to be connected in parallel with an electric utility. When a utility grid disturbance occurs, the protective relay functions integrated into the C200 microturbine will automatically shut down the system. The C200 can restart automatically to resume supplying electricity to connected loads once grid power returns to normal. In Grid Connect mode, the microturbine is a current source only - the microturbine synchronizes to the electric utility for both voltage and frequency reference. The microturbine can be used to provide base load power or shave peak power based on loads or user commands. Features The microturbine in Grid Connect operation allows electric utilities to expand generating capacity in small increments. This optimizes current infrastructure and reduces the need to upgrade specific site capacity and lowers overall costs. Grid Connect capabilities also include programmable peak shaving functions, which automatically configure the microturbine to operate on a timed schedule or to follow local loads, thereby reducing peak demand charges. These special features are described as Time of Use and Load Following dispatch modes later in this chapter. Time of Use supplies variable power levels at selected times to meet user load demand. Load Following tracks local electrical loads to supply power on an as-needed basis. An additional feature, Reverse Power Flow Protection, prevents the microturbine system from backfeeding the grid. Implementation of Load Following mode and Reverse Power Flow Protection requires installation of an external power meter and/or a timer or switch. The external power meter provides information to the microturbine on power flow at a point between the microturbine and the grid power supply. Power Specifications The power output in Grid Connect mode is three phase 400 to 480 V, 50/60 Hz. The microturbine automatically synchronizes with the grid, and will operate properly with either clockwise or counter clockwise phase rotation. For complete performance ratings, refer to Chapter 7: Performance and Chapter 8: Electrical Ratings in this document. For discussion of the protective relay functionality, refer to Chapter 9: Protective Relay Functions. For discussion of electrical interconnections, refer to Chapter 10: Communications and Chapter 12: Installation in this document. 410066 Rev C (June 2009) 4-1 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 C200 MICROTURBINE TECHNICAL REFERENCE
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