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Capstone Turbine Corporation 21211 Nordhoff Street Chatsworth CA 91311 USA Technical Reference: Dual Mode System Controller (DMSC) In normal Grid Connect operation, the output contactor in the MicroTurbine is closed and the MicroTurbine is generating power. The MicroTurbine’s output power flows out to the remainder of the distribution circuit and is consumed by the building loads. Normally, power is not exported to the utility grid. In the event of a disturbance on the utility grid, voltage and current sensing in the MicroTurbine will cause the internal contactor to open and the MicroTurbine to go through a shutdown procedure. The response time will, of course, depend on the type and severity of the disturbance and the protective relay settings in the MicroTurbine. Refer to C60/C65 Protective Relays Technical Reference (410033), or C200 Technical Reference Guide (410066) for details on these protective relay functions and set points. With the MicroTurbine output contactor open, utility voltage can still be sensed by the MicroTurbine circuitry. When utility voltage returns, the MicroTurbine senses it and an internal “reconnect” timer is started. UL 1741 requires that the MicroTurbine not reconnect to the grid for at least 5 minutes after the utility voltage and frequency have been restored to the normal operating ranges. The MicroTurbine provides for user adjustment of this internal reconnect timer from 5 to 30 minutes. Some local interconnection regulations may also require manual intervention before reconnecting any power source to the utility grid. To address this case, the MicroTurbine firmware provides a manual command, either through the display or through the RS232 communications port. When this manual utility reconnect control function is enabled, the MicroTurbine will reconnect to the grid as soon as a manual command has been sent to permit reconnection. Capstone’s remote monitoring software (CRMS) provides a user interface for issuing this manual “permission to reconnect” command. A communications command can also be transmitted through the RS232 port in the case that a PLC or other digital control equipment is used. The MicroTurbine display panel also provides for this manual reconnection using the “Start” command. When the conditions have been met to allow reconnection to the utility grid, the MicroTurbine will automatically close its output contactor, use the utility grid to start the MicroTurbine, and begin generating power again in Grid Connect mode. Figure 24 shows a timeline of this sequence for a typical utility fault, followed by an outage. Utility Fault Normal Operation Fault Detection Grid Connect Utility Returns 5 - 30 min > 2 min Normal Operation Grid Connect Page 55 of 71 Utility Voltage MicroTurbine Output MicroTurbine State Warmdown Standby Startup Voltage Sensing Reconnect Time Delay 410071 Rev. B (January 2009) Figure 24. Timeline of Typical Utility Fault 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 | TECH REF DMSC RB
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