Open Access

ARTICLE

Traceability Technology of DC Electric Energy Metering for On-Site Inspection of Chargers

Hua Li^1,*, Dezhi Xiong^2,3, Zhi Wang^2,3

1 Hunan Institute of Metrology and Inspection, Changsha, 410018, China
2 State Grid Hunan Electric Power Corporation Limited, Changsha, 410001, China
3 Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology, Changsha, 410001, China

* Corresponding Author: Hua Li. Email:

(This article belongs to the Special Issue: Advances in Modern Electric Power and Energy Systems)

Energy Engineering 2023, 120(3), 715-727. https://doi.org/10.32604/ee.2022.022990

Received 03 April 2022; Accepted 18 July 2022; Issue published 03 January 2023

Abstract

The on-site inspection of high-power DC chargers results in new DC high-current measurement and DC energy traceability system requirements. This paper studies the traceability technology of electric energy value for automotive high-power DC chargers, including: (1) the traceability method of the built-in DC energy meter and shunt of the charger; (2) precision DC high current and small precision DC voltage output and measurement technology. This paper designs a 0.1 mA~600 A DC high current measurement system and proposes a 0.005 level DC power measurement traceability system. The uncertainty evaluation experiment of the DC power measurement calibration system and the high-power DC charger’s on-site calibration experiment results verify the method’s effectiveness and feasibility in this paper. The experimental results show that the combined standard uncertainty of the DC power metering verification system can be 0.0451%.

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