UL 1741 CRD 多模式及 50kW 及以下功率的新型智能逆变器设置.pdf

1、UL 1741 CRD Multimode&UL 1741 CRD Multimode&New Smart Inverter Settings for 50kWNew Smart Inverter Settings for 50kWTony Anchante,Sr.Eng.TechCentral Hudson Distribution Planning&InterconnectionsWhat is CRD Multimode?What is CRD Multimode?CRD stands for Certification Requirements Decision and is part

2、 of UL 1741Applicable to DER systems that operate as grid following and grid formingThe standard tests applicable inverters and their corresponding Microgrid Interconnection Device(MID)to confirm proper operation(i.e.isolating from and reconnecting to the grid)Inverter TypesStand Alone Grid forming

3、Generate power while not connected to the gridUtility Interactive Grid following Generate power while connected in parallel to the gridMultimode Switches from grid following to grid forming Used with Energy StorageExternal MIDInternal MIDCurrent DER System Requirements(Prior to July 1,2025)All DER m

4、ust comply with UL1741-SBDER systems that include an inverter and external MID must comply to UL1741-SB as a systemAttestation letter from a Nationally Recognized Testing Laboratory(NRTL)may be accepted if certificate of compliance isnt availableDER System Requirements Starting July 1,2025All DER mu

5、st comply with UL1741-SBMultimode inverters must comply to CRD MultimodeCRD Multimode attestation letter from NRTL will NOT be acceptedSmart Inverter Settings UpdatesSmart Inverter Settings Updates The change is due to Central Hudsons Conservation Voltage Reduction(CVR)initiative CVR is anticipated to go into effect in Q3,2025 Only change from 50kW DER System Inverter Settings dated January 1,2023:Volt VAr curve Voltage-1 value Volt VAr curve Voltage-2 valueOld Smart Inverter Settings for 50kW(Jan.1,2023 Aug.31,2024)New Smart Inverter Settings for 50kW(Effective Sep.1