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KMID : 0615219940190010307
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Journal of Kwangju Health
1994 Volume.19 No. 1 p.307 ~ p.322
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A study of UPS control algorithm with discrete control for low distortion and phase synchronous
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박해암/Park HA
조정래/Cho JR
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Abstract
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Recently UPS(Uninterruptible Power Supply) systems are widly used in a variety of fields as a highly reliable power source.
But most of an UPS has a dual structure using analog circuits, digital or micro-processor for PWM and phase synchronous controller.
We present algorithm and technique using a discrete control even amplitude and synchronous for an UPS in this paper.
The proposed system in this paper is composed of a ROM, an A/D converter, a CTC, and a control S/W.
The amplitude controller consists of the ROM written modulation index from 0.75 to 0.99 of the PWM data and the A/D converter as an error voltage detector.
A timmer and counter mode of the CTC is used a controller for a phase synchronous.
We have simulated the algorithm and technique by using an IBM PC/386(40MHz) as a controller, and have obtained the lower distortion and the fast response on synchronous driving as a result.
From this result, we recognized that the proposed algorithm and technique is able to apply for an UPS system using only discrete control.
This has an advantage in a manufacturing system, because it is able to be used at a flexible and widly applicative operation range by an adjusting a control program.
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