TIDUEM8B March   2019  – February 2021

 

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1.1.2 Power Quality Meter, Power Quality Analyzer

In addition to being used for electricity meters, this standalone ADC architecture can be used for power quality analyzers and power quality meters. Power quality meters and power quality analyzers are used to help utilities and industrial enterprises monitor and control power quality by measuring certain power quality parameters, such as voltage harmonics, current harmonics, supply voltage dips, supply voltage swells, and other parameters as well. For these end equipment, a lot of computation is required for calculating the power quality parameters. Also, accuracy is important to be able to meet the accuracy requirements for the different power quality parameters. The requirement for high accuracy and computation power is something well supported by having a standalone ADC and separate host MCU or processor, as is done in this design.

A couple of the parameters commonly measured by power quality meters and power quality analyzers are voltage and current harmonics. For the most accurate harmonic calculations, coherent sampling should be implemented. One way of implementing coherent sampling is to vary the sampling clock based on the Mains frequency. The standalone ADC in this design has the ability to take in a varying clock so it can support coherent sampling. It should be noted that although the clock to the standalone ADC in this design can be varied, this design cannot support coherent sampling because the sampling clock cannot be varied with the proper resolution; however, this feature can be added in a future design since the standalone ADC can have its clock varied.