Journal Article10.1049/IP-B.1985.0003
Digital controller for thyristor current source
F.L. Luo,R.D. Jackson,R.J. Hill +2 more
- 01 Jan 1985
- Vol. 132, Iss: 1, pp 46-52
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TL;DR: In this article, the authors describe the circuits and algorithms used in a microprocessor-controlled AC/DC thyristor convertor to implement a wide-bandwidth closed-loop current source.
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Abstract: This paper describes the circuits and algorithms used in a microprocessor-controlled AC/DC thyristor convertor to implement a wide-bandwidth closed-loop current source. The convertor consists of two three-phase bridge circuits for four-quadrant operation, with direct digital control using a M6809 microprocessor. The timing pulse generator is linked to the supply frequency via a phase locked loop, making the system insensitive to supply frequency variation. The use of proportional-plus-integral (PI) control algorithms leads to fast responses to step changes in reference input. Results from constant-gain PI controllers are compared in the paper with theoretical responses based on approximate z-transform analysis to obtain optimum parameters for various modes of operation. In addition, results are presented from a simple variable-gain adaptive controller which adjusts the controller parameters depending on the reference change and operating point.
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Citations
Fast Response and Optimum Regulation in Digitally Controlled Thyristor Converters
Fang L. Luo,Roland J. Hill +1 more
TL;DR: In this paper, it was found that the completed feedback loop is significant in determining the influence of the distribution parameters to the response, with the first step response considerably improved by using a variable-gain control.
18
Microprocessor-based control of steel rolling mill digital DC drives
R.J. Hill,F.L. Luo +1 more
TL;DR: In this article, it is shown that the heavy current demand associated with maximal acceleration control can be reduced by using a form of proportional control where, in addition to the conventional inner-loop current feedback, a distance feedback term sets the high limiting value of the speed feedback signal, thus reducing the motor armature current.
12
Stability Analysis of Thyristor Current Controllers
Roland John Hill,Fang Lin Luo +1 more
TL;DR: In this article, the operational stability of proportional-integral (PI) controllers implemented in analogue, analogue with discrete sampling, and digital form have been theoretically investigated, and a new stability area is shown to exist for a discrete-sampled system with puire integral control and large gain.
11
Current Source Optimization in AC-DC GTO Thyristor Converters
R. John Hill,Fang L. Luo +1 more
TL;DR: A digital interface for a three-phase PWM ac-dc GTO converter is described, and a microprocessor-based firing scheme for the PWM control system is proposed, and two modulation strategies are implemented and their efficiencies of operation considered.
10
Performance Analysis of a Novel Microprocessor-Based Controller for a Phase-Controlled Rectifier Connected to a Weak AC System
Ali Mirbod,Ahmed El-Amawy +1 more
TL;DR: In this article, the performance analysis of a fast-response micro-processor-based firing and control scheme for a phase-controlled rectifier is presented, particularly when the converter operates in a closed loop fed by a weak ac system.
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References
•Book
Digital Control Systems
Benjamin C. Kuo
- 01 Jan 1977
TL;DR: This chapter introduces the z-Transform, a new type of transform that combines Laplace Transforms, z-Transforms and Modified Z-TRANSFORMS with Convolution Integral to achieve state-of-the-art control of Discrete-Data Systems.