Refers to AC voltage magnitude, frequency and waveform properties. The term power quality is widely used, even though it mostly refers to voltage characteristics (possibly current too). Power quality many times refers to harmonic distortion of AC waveforms introduced by nonlinear components such as power converters. Power quality also has a power-distribution aspect related to quality of service: power outages, their duration and frequency of occurrence.
Questions tagged [power-quality]
23 questions
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What is the physical/electrical limit of audio quality?
A few days ago I was in a class about electronics on my study. The first lesson was an introduction into the main subject, bits, analog signals, conversion, etc. An example was asked by the teacher: What is the maximum feasible amount of bits to…
Gizmo
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Capturing mains AC waveform with audio recording device
I'm wondering how practical (read: safe) it would be to use an audio capture device to "record" a mains AC signal for the purposes of monitoring the characteristics of the AC sine wave.
I am thinking something relatively simple like a feeding the…
Malvineous
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When a signal has an interharmonic, is the signal periodic or non-periodic?
I have some questions regarding interharmonics. What I'm going to do is first ask just a few, and then as people answer them I would expand this post or create a new question.
Harmonics are sinusoids that have a frequency which is an integer…
alejnavab
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Microcontroller power directly from SMPS DC-DC (SPR01 series) - is it OK?
Is it OK to supply power durectly from 5V SMPS DC-DC converter? Of course I will put several capacitors:
at the DC-DC output (I'd put 1uF or something),
at the controller power input(s) (I'd put 100nF or something at each input).
The schematic has…
Roman Matveev
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How do residential analog and smart meters measure power?
I'm building my own digital meter in order to upload the data to a SQL database; up until now I know that there are several parameters being measured into a digital watt-meter:
volts, current, apparent power, instantaneous power, actual power,…
GoatZero
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If interharmonics are defined for periodic signals, aren't interharmonics misleading?
Before explaining my question, I'm going to assume that 1) interharmonics, just like harmonics, are sinusoids; and 2) to analytically represent the interharmonics of a signal, we sum them to the Fourier series. This was discussed in this previous…
alejnavab
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Understanding equation for the quality factor of an RLC circuit?
In my textbook for a course on Circuit Analysis I came across an equation for the quality-factor of an RLC circuit. However, I don't quite understand their reasoning. The explanation that follows is a summary of what they provide me with:
The…
Micrified
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Is it difficult to join two modern power grids?
I understand the voltage, frequency, phase, and maybe power quality of each grid must all be compatible at the moment of linking, and that each grid is a complex beast that's difficult to influence. So in the past, it could be very difficult to…
ChrisPhoenix
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High vs Low audio transistor hFE (DC Current Gain). Which is better?
I'd like to preface by saying Rest in Peace my SoundBlasterX's back-panel transistors.
What I tried to do, shown in the images below was ground the copper heatsinks I had glued onto the metal side of the back-panel transistors (using ArcticSilver…
Daniel Elefteriadis
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Power Quality Measurement & Reporting Standards
I'm analyzing power quality in low and medium voltage facilities (50/60Hz; 0.48 - 69 kV; factories, campuses, etc.) while trying to apply existing standards wherever possible. In addition to demand metering the main PQ metrics I'm tracking…
Errorum
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Triplen harmonics not appearing in the output of DigSilent PowerFactory 2021
I am running simulations for harmonics resulting from the connection of an offshore wind farm to the main grid on DigSilent PowerFactory 2021 SP3. I am using a script to run multiple scenarios and store the output in CSV files. Based on the design,…
Danish Umer
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Do energy storage systems really improve the quality of the energy?
I know that an ESS (energy storage system) improve power quality issues avoiding interruptions, controlling the voltage and the frequency, injecting reactive power into the grid thanks to the capacitors in their inverters etc... but, inverters…
Samuele Benito Di Gioia
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What is the physical meaning of reactive power in non-sinusoidal steady-state (with harmonics)?
In sinusoidal steady-state (linear loads, no harmonics), I understand what is reactive power \$Q = V_{\text{rms}} I_{\text{rms}} \sin{(\theta)}\$ where \$\theta = \theta_v - \theta_i\$: its absolute value is the maximum rate of transfer of the…
alejnavab
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compare half-bridge drivers IC for maximizing the quality/price
I selected a couple of Half-Bridge Drivers Gate for my BLDC project from well-known companies
they nearly have the same specifications for my Mosfets such as voltage operation and Temperature range
As I'm naturally interested to pick the lowest…
Hamid s k
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Should I use a voltage regulator on a desktop computer?
Should I use a energy regulator on a desktop computer?
I would like to know if I should use an energy regulator on my desktop, since I live in Brazil northeast region and I'm not sure about the quality of local electricity.
I'm asking because I've…
Baraujo85
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