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Research Highlights

500-kW DC Metering Standard Ushers in Age of Ultra-fast EV Charging

  • Writerkrissadmin
  • Date2021-09-14 00:00
  • Hits1944

500-kW DC Metering Standard Ushers in Age of Ultra-fast EV Charging

 - Expected to Reduce Metering and Overcharging Errors of EV Fast Chargers -


 

The Electricity and Magnetism Group of the Korea Research Institute of Standards and Science (KRISS, President Hyun-Min Park) succeeded in developing a high current DC metering standard for fast charging of electric vehicles. This standard can be used to calibrate fast charging stations with a capacity up to 500 kW.

 

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High current DC metering standard developed by the KRISS Electricity and Magnetism Group

 

KRISS launched the calibration service for the Korea Testing Laboratory, which is the nation’s official testing and certification body. This is expected to reduce metering and overcharging errors at fast charging stations, thereby enhancing the reliability of the electric vehicle market.

 

In the early days of electric vehicles, a key issue was the total electrical range that can be achieved on a single charge, but this is being resolved with the rapid development of battery technology. Securing electric vehicle charging stations and achieving faster charging times are the more pressing issues today.

 

Electric vehicles have different charging times depending on charging method and charger capacity. 7-kW standard chargers rely on AC, and are usually installed for apartments and private houses. Fast chargers have different capacities of 50 kW, 100 kW, or 350 kW, and usually take around an hour to provide a full charge.


? Fast chargers are capable of rapid charging at high power as they rely on direct current instead of passing through the EV onboard charger.

 

A domestic electric vehicle with a 64-kWh battery can run 406 km when fully charged. A full charge takes 1 hour and 20 minutes at a 50-kW fast charging station, or about 20 minutes at a 350-kW ultra-fast charging station, installed at expressway rest areas nationwide.

 

그림입니다. 원본 그림의 이름: DSC_5278.JPG 원본 그림의 크기: 가로 3000pixel, 세로 1981pixel 사진 찍은 날짜: 2021년 08월 06일 오후 4:49 카메라 제조 업체 : NIKON CORPORATION 카메라 모델 : NIKON D850 프로그램 이름 : Adobe Photoshop CS6 (Windows) F-스톱 : 8.0 노출 시간 : 10/1000초 IOS 감도 : 400 색 대표 : sRGB 노출 모

Kyu-tae Kim, principal research scientist of the Electricity and Magnetism Group, is conducting a high current DC metering test.

 

Local companies have been developing fast chargers with a capacity of 400 kW or larger, but measurements were not reliable due to the lack of a metering standard. Most countries do not have DC metering standards, except Switzerland, which provides a standard for capacities up to 50 kW.

 

With the support of the Next-generation Metering Technology Development Project of the Korean Agency for Technology and Standards, the KRISS Electricity and Magnetism Group succeeded in developing a 500-kW (1000 V x 500 A) DC metering standard, and launched its first calibration service. Korea has become the first in the world to establish this standard.

 

 

그림입니다. 원본 그림의 이름: DSC_5299.JPG 원본 그림의 크기: 가로 3000pixel, 세로 2000pixel 사진 찍은 날짜: 2021년 08월 06일 오후 4:50 카메라 제조 업체 : NIKON CORPORATION 카메라 모델 : NIKON D850 프로그램 이름 : Adobe Photoshop CS6 (Windows) F-스톱 : 11.0 노출 시간 : 10/1000초 IOS 감도 : 400 색 대표 : sRGB 노출

Researchers of the KRISS Electricity and Magnetism Group

(From left: Hyung-kew Lee, head of the group; Kyu-tae Kim, principal research scientist; Sang-hwa Lee, principal research technician)

 

Pursuant to the Measures Act, DC meters in legal measuring instruments must be regularly inspected as of 2020. Charging stations must undergo tests by official testing and certification bodies like the Korea Testing Laboratory, and the newly developed standard by KRISS will be used in calibration.

 

In establishing the new standard, KRISS applied its existing standard for DC voltage and DC high current. A virtual charger that gives accurate DC output was created, and values obtained from the virtual charger were compared against reference meters to be used for the verification of fast chargers. The proposed standard has an uncertainty of 0.04 % (k = 2).

 

Hyung-kew Lee, head of the Electricity and Magnetism Group, said, “We are pleased by the fact that we were able to respond to demands of the government and related markets opportunely by using KRISS’ high current measurement technology. The new standard will contribute to enhancing the reliability and quality of fast charging stations.”


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