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Phase 3 Functions from SIWG Recommendations Document

The results of the 3-19-15 survey are shown. DER manufacturers, implementers, and aggregators were combined, since most

aggregators are also implementers. In this Table, only the majority vote is shown (see the pdf files for details). If there was no majority, I indicate the two or three highest results as H-M, H-O, M-O, or H-M-O. A couple of functions (F-W and connect/disconnect DER) were left out of the survey by mistake.

A number of additional functions have been suggested and are added to the end of the Table. Q# 2 Phase 3 DER Functions with Communications Description Communication Requirements ICT: DER system provides alarms and emergency information to utility and/or REP Util H/M/O H DER H/M/O O Oth H/M/O H Constraints & Comments Larger DERs or multiple DERs within a facility Monitor Alarms: Provide The DER system (and aggregations of DER systems, emergency alarms and such as virtual power plants) provides alarms and information supporting emergency information via the FDEMS to the utility. This function is feasible only if the ICT infrastructure is available. Monitor DER Status and Output: Provide status and measurements on current energy and ancillary services The DER system (and aggregations of DER systems, such as virtual power plants) provides current status, power system measurements, and other real-time data (possibly aggregated via the FDEMS) to the utility, in order to support real-time and short-term analysis applications. This function is feasible only if the ICT infrastructure is available. (Revenue metering data is provided via alternate means.) 3 ICT: DER system provides status and measurement values to utility and/or REP H H H Larger DERs or multiple DERs within a facility Q# 4 Phase 3 DER Functions with Communications Limit Maximum Real Power: Limit maximum real power output at an ECP or the PCC upon a direct command from the utility Description Communication Requirements Autonomous Local: Monitor real power output at PCC ICT: Utility issues a command to limit the real power output at the ECP or PCC Util H/M/O H DER H/M/O H Oth H/M/O O Constraints & Comments Larger DERs or large groups of DERs where ICT capabilities are available The utility issues a direct command to limit the maximum real power output at the ECP or PCC. The reason might be that unusual or emergency conditions are causing reverse flow into the feeder’s substation or because the total DER real power output on the feeder is greater than some percentage of total load. The command might be an absolute watt value or might be a percentage of DER output. This function is feasible only if the ICT infrastructure is available. It might also be used to ensure fairness across many DER systems. 5 Schedule Output at PCC: Schedule actual or maximum real power output at specific times The utility establishes (or pre-establishes) a schedule (e.g. on-peak & off-peak) of actual or maximum real power output levels at the ECP or PCC, possibly combining generation, storage, and load management. The reason might be to minimize output during low load conditions while allowing or requiring higher output during peak load time periods. Autonomous Local: Monitor real power output at ECP or PCC. ICT: Utility updates the schedule of actual or maximum real power values H O H-O Larger DERs or multiple DERs within a facility Q# Phase 3 DER Functions with Communications Frequency-Watt: Counteract frequency excursions beyond normal limits by decreasing or increasing real power Voltage-Watt: Modify real power output autonomously in response to local voltage variations Description Communication Requirements Autonomous Local: Monitor voltage anomalies ICT: Utility updates frequency response settings Autonomous Local: Monitor voltage ICT: Utility modifies the real power output settings Autonomous Local: Monitor voltage anomalies ICT: Utility updates dynamic current settings Util H/M/O H DER H/M/O H Oth H/M/O H Constraints & Comments All DER systems but may not always be activated (Left out of survey by mistake) The DER system reduces real power to counteract frequency excursions beyond normal limits (and vice versa if additional generation or storage is available), particularly for microgrids. Hysteresis can be used as the frequency returns within the normal range to avoid abrupt changes by groups of DER systems. The DER system monitors the local (or feeder) voltage and modifies real power output in order to damp voltage deviations. Settings are coordinated between the utility and DER operator. Hysteresis and delayed responses could be used to ensure overreactions or hunting do not occur. The DER system counteracts voltage anomalies (spikes or sags) through “dynamic current support”. The DER system supports the grid during short periods of abnormally high or low voltage levels by feeding reactive current to the grid until the voltage either returns within its normal range, or the DER system ramps down, or the DER system is required to disconnect. 6 H M M All DER systems but may not always be activated 7 Dynamic Current Support: Counteract voltage excursions beyond normal limits by providing dynamic current support H H H All DER systems but may not always be activated