Design of a calibration board integrated in a Smart Electrical Energy Meter (hardware part)

Abstract

We present in this paper, the design of a calibration board integrated into a Smart Electrical Energy Meter (SEEM). Indeed, we proposed a method to calibrate remotely and onsite the SEEM, where the meter is self-calibrated based on a current reference value and a voltage reference value. These references should be generated by an integrated power source. So we included in the calibration board a converter and an AC load. The converter is used to convert the voltage coming from the electrical network, which can vary, to a reference voltage which is stable and known, while the AC load is used to set the current value. The designed converter is an AC-DC-AC type, called indirect converter. To control the DC-AC block switches we used a digital technique based on the feed-forward technique. Our design of the AC-AC converter is validated by a simulation on MATLAB where we show for a variable input voltage around a nominal value, the output voltage remains stable with a very low Total Harmonic Distortion (THD).