Abstract
The electrical power is supplied to consumers as a pure sinewave voltage at power frequency. The electrical current drawn by the consumers` apparatus ought to be a pure sinewave current at the same frequency. Some comsumers possess, however, apparatus whose impedances are not constant during a period of the power frequency. The current drawn from the power supply then deviates from perfect sinusoids. The distorted current runs through impedances located between the consumers and the idealized voltage source of the system, causing non-sinusoids voltage drops. The voltage at power system nodes becomes distorted with a content of higher frequency components (harmonics) in addition to the fundamental. Power electronic convertors are equipment with a discontinous variable impedance, and a growing amount of electrical power is regulated by such equipment. This thesis describes computing methods, measuring principles and yielding standards to analyze distortions from all kind of power electronic convertors connected to the power system. Two different methods are discussed: In the frequency domain method the disturbing apparatus (the convertor) is represented as an ideal current or voltage source for harmonic currents or voltages. This representation is based upon Fourier-series theory regarding a non-linear impedance as a harmonic current or voltage source.
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Citation Formats
Stroemsvik, T.
Power electronics as source for disturbances in power distribution systems. Analysis and assessment of noise level; Kraftelektronikk som kilde til forstyrrelser i fordelingsnettet. Analyse og vurdering av stoeynivaa.
Norway: N. p.,
1990.
Web.
Stroemsvik, T.
Power electronics as source for disturbances in power distribution systems. Analysis and assessment of noise level; Kraftelektronikk som kilde til forstyrrelser i fordelingsnettet. Analyse og vurdering av stoeynivaa.
Norway.
Stroemsvik, T.
1990.
"Power electronics as source for disturbances in power distribution systems. Analysis and assessment of noise level; Kraftelektronikk som kilde til forstyrrelser i fordelingsnettet. Analyse og vurdering av stoeynivaa."
Norway.
@misc{etde_10141608,
title = {Power electronics as source for disturbances in power distribution systems. Analysis and assessment of noise level; Kraftelektronikk som kilde til forstyrrelser i fordelingsnettet. Analyse og vurdering av stoeynivaa}
author = {Stroemsvik, T}
abstractNote = {The electrical power is supplied to consumers as a pure sinewave voltage at power frequency. The electrical current drawn by the consumers` apparatus ought to be a pure sinewave current at the same frequency. Some comsumers possess, however, apparatus whose impedances are not constant during a period of the power frequency. The current drawn from the power supply then deviates from perfect sinusoids. The distorted current runs through impedances located between the consumers and the idealized voltage source of the system, causing non-sinusoids voltage drops. The voltage at power system nodes becomes distorted with a content of higher frequency components (harmonics) in addition to the fundamental. Power electronic convertors are equipment with a discontinous variable impedance, and a growing amount of electrical power is regulated by such equipment. This thesis describes computing methods, measuring principles and yielding standards to analyze distortions from all kind of power electronic convertors connected to the power system. Two different methods are discussed: In the frequency domain method the disturbing apparatus (the convertor) is represented as an ideal current or voltage source for harmonic currents or voltages. This representation is based upon Fourier-series theory regarding a non-linear impedance as a harmonic current or voltage source. In the time domain method the electrical equivalent of the power electronic convertor consists of the non-linear (time-varying) elements (thyristor, diodes and switches) in addition to the ordinary linear elements of the circuit. The time-varying elements are activated during a period of the power frequency, thus altering the circuit impedance. 84 refs., 129 figs., 19 tabs.}
place = {Norway}
year = {1990}
month = {Aug}
}
title = {Power electronics as source for disturbances in power distribution systems. Analysis and assessment of noise level; Kraftelektronikk som kilde til forstyrrelser i fordelingsnettet. Analyse og vurdering av stoeynivaa}
author = {Stroemsvik, T}
abstractNote = {The electrical power is supplied to consumers as a pure sinewave voltage at power frequency. The electrical current drawn by the consumers` apparatus ought to be a pure sinewave current at the same frequency. Some comsumers possess, however, apparatus whose impedances are not constant during a period of the power frequency. The current drawn from the power supply then deviates from perfect sinusoids. The distorted current runs through impedances located between the consumers and the idealized voltage source of the system, causing non-sinusoids voltage drops. The voltage at power system nodes becomes distorted with a content of higher frequency components (harmonics) in addition to the fundamental. Power electronic convertors are equipment with a discontinous variable impedance, and a growing amount of electrical power is regulated by such equipment. This thesis describes computing methods, measuring principles and yielding standards to analyze distortions from all kind of power electronic convertors connected to the power system. Two different methods are discussed: In the frequency domain method the disturbing apparatus (the convertor) is represented as an ideal current or voltage source for harmonic currents or voltages. This representation is based upon Fourier-series theory regarding a non-linear impedance as a harmonic current or voltage source. In the time domain method the electrical equivalent of the power electronic convertor consists of the non-linear (time-varying) elements (thyristor, diodes and switches) in addition to the ordinary linear elements of the circuit. The time-varying elements are activated during a period of the power frequency, thus altering the circuit impedance. 84 refs., 129 figs., 19 tabs.}
place = {Norway}
year = {1990}
month = {Aug}
}