Design and Implementation of Three-phase Voltage and Current Transducers for Digital Signal Processing TMS320F28335

Abstract

The intention of this paper is to design and implement a hardware prototype of the three-phase measurement board for digital signal processing (DSP) TMS320F28335 experimental kits. The voltage (LV 25-P) and current (LA 25-NP) transducers from LEM were used in this research. The characteristic of the voltage waveform, its amplitude, phase-angle and phase sequence are vital parameters for effective PV-grid synchronization. A signal conditioning circuit made of a summing operational amplifier (TL082) was used to provide an offset voltage to the generated bipolar signal waveforms from both transducers. A details design calculations and analysis for each section of the proposed system are also presented. The result shows that the implementation of voltage (LV 25-P) and current (LA 25-NP) transducers together with a signal conditioning circuit able to achieve essential voltage levels that comply with DSP TMS320F28335 ADC’s requirements.