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Capstone Turbine Corporation 21211 Nordhoff Street Chatsworth CA 91311 USA Technical Reference: Dual Mode System Controller (DMSC) DMSC Fast Transfer Specification This section explains the performance and switching logic between Grid Connect and Stand Alone modes of operation. A Dual Mode MicroTurbine can transition from Grid Connect to Stand Alone within 10 seconds. It can also go into Hot Standby mode when returning to Grid Connect operation to enable a quick transition back to Stand Alone mode if necessary. This “Fast Transfer” capability can be extremely beneficial for protected loads that value high availability of power. The following paragraphs provide the details on how the MicroTurbine and DMSC function to accomplish this high level of load protection. UL 1741 Requirements for Utility Interconnection MicroTurbines are UL listed to 2200 and 1741, and meet the harmonics requirements of IEEE 519. They are also pre-certified for utility interconnection by many local jurisdictions to simplify connecting to the utility grid, such as in California and New York. These local certifications often rely on the UL 1741 listing, which defines how power inverters must react to disturbances on the utility grid. Before describing the Fast Transfer capability of the Dual Mode MicroTurbine, it is useful to review how the MicroTurbine achieves the UL 1741 listing and how it operates under typical utility grid disturbances. Grid Connect Functionality Figure 23 shows a one line schematic of a Grid Connect (not Dual Mode version) MicroTurbine connected to the utility grid. In this example, short circuit and overload protection is provided by the circuit breaker CB1 between the MicroTurbine and the utility grid. The protective relay functionality required by UL 1741 is integral to the MicroTurbine firmware, and includes voltage, frequency, and anti-islanding functions. The following paragraphs give a short description of how the Grid Connect version reacts to a utility disturbance. Utility Grid CB1 Output Contactor Figure 23. One Line Schematic of a MicroTurbine Connected to Utility Grid 410071 Rev. B (January 2009) Page 54 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. Voltage Sensing MicroTurbine Building LoadsPDF Image | TECH REF DMSC RB
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