ul1741 sa, rule 21, and what it means for youmedia3.ev-tv.me/ul-1741-supplement-a_webinar.pdf• ul...
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![Page 1: UL1741 SA, Rule 21, and what it means for youmedia3.ev-tv.me/UL-1741-Supplement-A_Webinar.pdf• UL 1741 SA Webinar made by UL • NREL White Paper. Questions? Joshua Brister Sr. Manager,](https://reader030.vdocuments.net/reader030/viewer/2022041101/5eda1393b3745412b570b868/html5/thumbnails/1.jpg)
UL1741 SA, Rule 21, and what it means for you
Josh Brister
Sr. Manager, Product Management and Tech Sales
![Page 2: UL1741 SA, Rule 21, and what it means for youmedia3.ev-tv.me/UL-1741-Supplement-A_Webinar.pdf• UL 1741 SA Webinar made by UL • NREL White Paper. Questions? Joshua Brister Sr. Manager,](https://reader030.vdocuments.net/reader030/viewer/2022041101/5eda1393b3745412b570b868/html5/thumbnails/2.jpg)
Contents
• What are these requirements?
• UL versus IEEE versus Rule 21, etc
• How will this help support the grid?
• How will this be implemented?
• How do I remain compliant?
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What is UL1741 SA?
• Officially called “UL 1741: Standard for Inverters, Converters, Controllers and Interconnection System Equipment for Use with Distributed Energy Resources”
• In essence, the test standard by which inverters are certified for interconnection to the grid, with particular respect to:
‒ Grid Voltage
‒ Grid Frequency
• Intended to supplement and be used in conjunction with IEEE 1547 (Standard for Interconnecting Distributed Resources with Electric Power Systems) and IEEE 1547.1 (Standard for Conformance Test Procedures) in accordance with NEC
• Developed by workgroup representing Inverter industry, electric utilities, NREL, EPRI
• SA is short for Supplement A, an addition to the existing UL 1741 standard
‒ Designed to create a standard for inverters more capable of dealing with a volatile grid
‒ “Future-Proofing” by creating a standard for inverters to actively manage grid functions
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UL vs. Rule 21 vs. 14H
UL 1741 SA
CA Rule 21 HI Rule 14H
PG
&E
SCE
SDG
&E
Product Certification Standard
State Interconnection Requirements, also called Source Requirements Document (SRD)
Local Interconnection RequirementsH
ECO
MEC
O
KU
IC
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How will UL 1741 SA be implemented?
All projects permitted and approved for interconnection on or after September 8th 2017 will need to be certified to UL 1741 SA
‒ In Hawaii
‒ In California
‒ In other utility districts running pilot programs, such as
• APS
• Green Mountain Power
Source: Outback Power
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Labelling Requirements
• In addition to being approved on state lists, product will need to be physically labelled as “Grid Support Inverter” rather than simply “Grid Interactive”
‒ You may hear these referred to as “Smart Inverters” or “Advanced Inverters”
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What does UL 1741 SA test?
Mandatory
• Anti-Islanding
• Low/High Voltage Ride Through
• Low/High Frequency Ride Through
• Ramp Rate
• Specified Power Factor
• Volt/Var mode
Optional (Depends on SRD)
• Frequency Watt
• Volt Watt
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Why is this needed?
Source: SolarEdge
• Grids are facing higher penetration rates of PV, and in some cases, saturation
• Existing UL 1741 standards had very strict thresholds for operation and shutdown
• Imagine cases with high PV penetration and• Intermittent clouds (Ramp Rate)• Aging transformers (VRT)• Afternoon confluence of higher loads and PV
dropping offline (VRT and FRT)
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UL vs. Rule 21 vs. 14H
Source: Outback Power
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Examples of Grid Support Features
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Low/High Frequency Ride-Through
Source: SolarEdge
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Voltage Ride-Through
Source: SMA
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Volt-Var Mode
1. Grid voltage nominal, purely active power
2. Grid voltage high, add ‘inductive’ reactive power
3. Grid voltage low, add ‘capacitive’ reactive power
1
2
3
Adjusting VArs keeps grid voltage from oscillating; acts like a shock absorber Intended result is automatic stabilization of grid voltage
Source: SMA
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Ramp Rate (Normal and Soft Start)
Power Gradient
These parameters define how the inverter will gradually ramp up to the preset active and reactive power during:• Normal Operation• Soft Start
Defined as a % of Inom / Second
Source: ABB
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Frequency Watt (Optional by SRD)
Support grid frequency by changing inverter wattage output 1. Grid frequency nominal,
inverter at max output 2. Grid frequency high,
inverter curtails power 3. Grid frequency low,
inverter increases powerif available
1
2
3
Source: SolarEdge
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Which inverters are compliant?
Company Product Expected Date of Certification AEE Availability
Enphase IQ6-60-2-US Certified Now Available Now
Enphase IQ6PLUS-72-2-US, IQ6PLUS-72-5-US Certified Now Available Now
Enphase IQ6-60-ACM, IQ6PLUS-72-ACM Certified Now Available Now
Fronius Primo 3.8-1 208-240; 5.0-1; 6.0-1; 7..6-1; 8.2-1 Certified Now Available Now
FroniusPrimo 10.0-1 208/240; 11.4-1; 12.5-1; 15.0-1;
Symo 10.0-3 208/240; 12.0-3 208/240 Expected date of cert Oct 2017 Available Now
Fronius Symo 15.0-3 208 Expected date of cert Oct 2017 Available Now
FroniusSymo 10.0-3 480; 12.5-3; 15.0-3; 20.0-3; 22.7-3;
24.0-3 Certified Now Available Now
SolarEdgeSE3000A-US/ 3800/ 5000/ 6000/ 7600/ 10000/
11400 Certified Now Available Now
SolarEdge SE3000H-US/ 3800/ 5000/ 6000/ 7600 Certified Now Available Now
SolarEdgeSE9KUS, SE14.4KUS, SE10KUS, SE20KUS,
SE33.3KUS Certified Now Available Now
SMA SB3.0-1SP-US-40/3.8/5.0/6.0/7.0/7.7 Certified Now Available Now
Outback Radian/VFXR/FXR Certified Now Available Early September
Ginlong Solis-1P3k-4G-US-SA/3.6/4.6/5/6/7/7.6/8/9/10k Certified Now Available Now
ABB PVI-3.0/3.6/3.8/4.2; PVI-5000/6000; UNO-
7.6/8.6; UNO-DM-PLUS-3.0/3.6/3.8/4.2/5.0 Certified Now Available Now
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Where can I learn more?
• CEC Approved Inverter List
• Hawaii Approved Inverter List
• Calseia compliance list
• CPUC Rule 21 page
• UL 1741 SA Webinar made by UL
• NREL White Paper
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Appendices
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Rule 21 Rollout
Phase 1
• Autonomous Control
• Effective 9/8/2017
Phase 2
• Communications (SEP 2.0) Required
• Expected in 2018
Phase 3
• Interoperability
• Signalling from utility, etc.
• NOC required
• No timeline