Effective and Reactive Power Measurement Technique Using a Phase Angle of Voltage-Based Current DFT

Abstract

Background/Objectives: Recently, customers have asked for highly reliable quality power and various energy operation services. To meet this expectation, it is necessary to investigate a new energy operation paradigm integrating information telecommunications technology. The present government, too, actively, promotes commercialization of green power IT technology and export industrialization as part of “low-carbon green growth” and “green energy industrial development strategy.” Methods/Statistical analysis: This paper could detect the current information as a result of the application of DFT algorithm based on the measured voltage phase. At this time, as a result of a simulation using PSIM tool, it could simply be separated into the term of effective power component and the term of reactive power component, and it was noted that it had an excellent rapid response in detecting effective power as compared to the existing method. In addition, the below conclusions could be drawn as a result of the production of an actual digital measuring system and the application of it to a single-phase power measurement. Findings: This paper measured the current, applying a DFT algorithm based on the angle of the voltage phase to detect power information about the fundamental harmonic component. At this time, in applying the DFT algorithm, terms in Fourier series can be separated into an effective current component with the same phase as the voltage and reactive current component with a phase difference of 90° with voltage. Thus, the proposed power measurement technique can make simple calculations, not applying “zero-level detection method” and “phase angle detection method through software” in reactive power detection. Thus, this study could express reactive power as an algebraic sum in calculating it and could reduce the complexity. Improvements/Applications: It is expected that the power measurement technique proposed in this paper will be utilized as a power measurement technique through its advantages that it has less complexity as compared to the existing method and can be composed simply.