Real Time Voltage and Current Phase Shift Analyzer for Power Saving Applications

Abstract

Nowadays, high importance is given to low energy devices (such as refrigerators, deep-freezers, washing machines, pumps, etc.) that are able to produce reactive power in power lines which can be optimized (reduced). Reactive power is the main component which overloads power lines and brings excessive thermal stress to conductors. If the reactive power is optimized, it can significantly lower the electricity consumption (from 10 to 30%—varies between countries). This paper will examine and discuss the development of a measuring device for analyzing reactive power. However, the main problem is the precise real time measurement of the input and output voltage and current. Such quality measurement is needed to allow adequate action intervention (feedback which reduces or fully compensates reactive power). Several other issues, such as the accuracy and measurement speed, must be examined while designing this device. The price and the size of the final product need to remain low as they are the two important parameters of this solution.

Recursive Pyramid Algorithm-Based Discrete Wavelet Transform for Reactive Power Measurement in Smart Meters

“…In [4], the reactive energy using time shift approach is mathematically expressed as: (1) where T is the time period of the fundamental frequency component of the voltage waveform. If the voltage and current waveforms contain harmonic distortion, the time shift approach loses its physical meaning because it is only valid when applied to the fundamental frequency component.…”

“…The increase in global energy demand has resulted in almost daily increases in energy prices; therefore, energy conservation is important for both consumers and service providers [1]. Energy conservation can save money for consumers by reducing tariffs; on the other hand, supplying more consumers with lower energy production reduces installation costs for service providers [2].…”

“…The reactive power in such equipment is used to generate a magnetic field, which is essential for the inductive elements in these pieces of equipment to operate [8]. Although reactive power is required to operate several pieces of equipment, if supplied in excess, it can also make harmful effects on appliances and installed electrical infrastructure [1].…”

Real-Time Power Measurements in Smart Building Monitoring System

“…However, the efficiency of energy saving solution is directly proportional to the accuracy of the acquired quantities (voltage and current). The knowledge of these quantities is essential for successive processing and to gather the passing current and terminal voltage and to perform basic data processing (Krejcar & Frischer, 2012).…”

Measuring of Electric Energy Consumption in Households by Means of Arduino Platform

“…Measured appliance is then plugged into the socket in the wattmeter. It is a cheap device which allows immediate consumption monitoring [21][22][23][24]. Selected models are also able to save the history of consumption in short-term interval (units of days).…”