Design of an Analyser for DC Power Quality Measurements in between Electric Vehicles and Rapid Chargers

The increase in the use of electric vehicles (EV) has caused a growth in EV chargers, which incorporate DC metering to bill consumers. These EV chargers can generate electrical disturbances superimposed on the DC that interfere with the metering if it has insufficient immunity to this DC power quality (PQ) phenomena. This paper describes the design of an analyser to measure DC PQ . The specifications and constraints of the DC PQ analyser are given, with a detailed plan of the instrument components and assembly. The paper also explains the measurement requirements for the validation of the analyser. It is necessary to measure the DC PQ in between EVs and their DC chargers to ensure that the DC metering standards such as IEC 62052-11 applied, are appropriate for the distortions present.