Non-vehicle charger electric energy metering performance test system and method based on virtual load

Abstract

The invention relates to a non-vehicle charger electric energy metering performance test system and method based on a virtual load. The system comprises a DC voltage source 1, a DC current source 2, a non-vehicle charger 3 and a DC electric meter 4, wherein the DC voltage source is used for outputting a DC voltage signal to the non-vehicle charger 3, the DC current source is used for outputting a DC current signal to the non-vehicle charger 3, the non-vehicle charger has a virtual load test portion, a metering module of the virtual load test portion is used for metering electric energy passing through the non-vehicle charger 3, the DC electric meter is used for metering the electric energy passing through the non-vehicle charger 3, the electric energy metered by the DC electric meter is compared with the electric energy metered by the metering module of the non-vehicle charger 3 to acquire electric energy difference, and the electric energy difference is an electric energy metering error of the non-vehicle charger.

Description

technical field [0001] The invention belongs to the field of electric energy metering, and more particularly relates to a system and method for testing the electric energy metering performance of an off-vehicle charger based on a virtual load. Background technique [0002] There are two charging methods for electric vehicle power batteries: AC charging and DC charging. AC charging generally uses a current of about 15A, and the charging time is 5 to 8 hours; DC charging can use a large current of 150A to 600A, and the charging time is 20 minutes to 2 hours. [0003] The equipment used for DC charging of electric vehicles is called off-board charger, which is fixedly installed outside the electric vehicle and connected to the AC power grid. Relevant national departments have successively issued NB / T33001-2010 "Technical Conditions for Off-board Conductive Chargers for Electric Vehicles", NB / T33008.1-2013 "Specifications for Inspection and Test of Electric Vehicle Charging Equ...

AI Technical Summary

Problems solved by technology

However, since the electric energy of the off-board charger comes from AC rectification, it cannot use the virtual load measurement test method similar to the AC charging pile, and can only be tested in the form of real load in the laboratory

This has the following disadvantages: First, it needs to be equipped with a dedicated DC resistance / electronic load

Second, the DC resistance / electronic load generates a lot of heat, which seriously affects the maintenance of temperature and humidity in the laboratory

The noise of the fan installed for heat dissipation is high, which seriously affects the physical and mental health of laboratory testing personnel

Third, the DC resistance / electronic load needs to consume a lot of power during the test, which is a huge waste of energy and does not conform to the direction of technological development

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