Virtual Instrument Module for Detecting Current and Voltage Distortion in Three-Phase Networks

Due to the increased use of electricity and the deterioration of its quality, it is necessary to use monitoring systems for control. Monitoring systems built on virtual devices have many advantages over systems whose architecture is mostly technical. In relation to technical means of monitoring, due to the use of a computer for virtual devices, they have a much greater value of memory for storing and processing data, which in turn provides the ability to calculate a large number of indicators and increase calculation accuracy. This article discusses a virtual instrument for determining the main characteristics of a three-phase network voltage, current and total harmonic distortion. Based on the preprocessed discrete data array of three current signals and three voltage signals, a calculating values procedure based on the IEEE 1459-2010 standard was developed, and LabVIEW is used as a development platform. Using operations with data arrays, procedures for calculating the RMS values of the basic component and higher harmonics are implemented for voltage and current. There is also an example of using a virtual instrument as a subroutine to build a more complex system.