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Journal ArticleDOI

A microprocessor-based firing control scheme for three-phase thyristor power converter

01 Nov 1990-Journal of Microcomputer Applications (Academic Press)-Vol. 13, Iss: 4, pp 361-369
TL;DR: In this paper, a microprocessor-based firing control scheme for the constant firing angle of the thyristors of the line commutated converter under a variable frequency source is presented.
About: This article is published in Journal of Microcomputer Applications.The article was published on 1990-11-01. It has received 4 citations till now. The article focuses on the topics: Thyristor & Three-phase.
Citations
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01 Jan 2013
TL;DR: In this paper, the steady state analytical performance of a line commutated inverter fed three phase synchronous motor under variable speed condition is presented, where the firing pulses for six silicon-controlled-rectifiers of the three phase inverter are generated by the control circuit in proper sequence with the help of synchronizing signal derived from the induced electromotive force of the synchronous machine by using voltage sensor.
Abstract: The steady state analytical performance of a line commutated inverter fed three phase synchronous motor under variable speed condition is presented. The firing pulses for six silicon-controlled-rectifiers of the three phase inverter are generated by the control circuit in proper sequence with the help of synchronizing signal derived from the induced electromotive force of the synchronous machine by using voltage sensor. The analytical results indicate that a three-phase synchronous machine supplied by an inverter with the excitation winding connected in series to the input of the inverter provides similar characteristics of dc series motor.

3 citations


Cites background or methods from "A microprocessor-based firing contr..."

  • ...The power circuit and firing control circuit configuration of the inverter are very simple [6] in structure....

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  • ...In order to obtain reliable control of the SCR-based power converter, a synchronous firing control scheme is necessary for its SCRs over a wide range of ac supply frequencies [6]....

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Journal ArticleDOI
TL;DR: In this article, the experimental results show that a three-phase synchronous motor supplied by a line commutated inverter with the excitation winding connected in series to the dc link provides excellent characteristics of the conventional dc series motor.
Abstract: This paper concerns the experimental investigations of the three-phase line commutated SCR inverter fed synchronous motor. The fabricated system consists of a line-commuted inverter, a three-phase synchronous motor with the excitation winding connected in series to the inverter input, a terminal voltage sensor and a gate-pulse generating circuit. The firing pulses for SCRs of the inverter are generated by the microprocessor in proper sequence with the help of synchronizing signal derived from the terminal voltages of the synchronous machine. The steady state performance characteristics are obtained experimentally using the fabricated system. The experimental results show that a three-phase synchronous motor supplied by a line commutated inverter with the excitation winding connected in series to the dc link provide excellent characteristics of the conventional dc series motor.

1 citations


Cites background or methods from "A microprocessor-based firing contr..."

  • ...This synchronizing signal is inputted to the microprocessor-based control circuit [11] for generating firing pulses for six SCRs of the inverter in proper sequence....

    [...]

  • ...The power circuit and triggering circuit [11] for SCRs of the inverter are very simple in structure....

    [...]

Journal ArticleDOI
30 Nov 2018
TL;DR: In this article, a comparative study of the application of IGBT versus Thyristor versus IGBT in AC-DC controlled power converter is presented, where both simulation and practical experiment have been carried out to test the relationship between the average output voltage (Vdc) with firing angle and triggering pulse width (, for IGBT) and also the total harmonic distortion has been observed in both the cases.
Abstract: This paper presents a comparative study of the application of Thyristor versus IGBT in AC-DC controlled power converter. Both simulation and practical experiment have been carried out to test the relationship between the average output voltage (Vdc) with firing angle (α, for Thyristor) and triggering pulse width (, for IGBT). Also the total harmonic distortion (THD) has been observed in both the cases. It is observed that IGBT based power converter introduces more harmonics in the system, in spite of more symmetrical output voltage wave shape.
References
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Journal ArticleDOI
TL;DR: In this article, the authors describe the design, construction, and testing of a speed control unit for a separately excited dc motor fed from a three-phase six-pulse fully controlled thyristor bridge.
Abstract: This paper describes the design, construction, and testing of a thyristorized speed control unit for a separately excited dc motor. The motor is fed from a three-phase six-pulse fully controlled thyristor bridge. A speed loop with a proportional plus integral controller maintains the desired speed irrespective of the load variations on the motor. An inner current control loop protects the thyristors from overcurrents. This loop also provides fast response overcoming the effect of disturbances such as variations in supply voltage. The design aspects of the control loops are discussed, and experimental results are given.

64 citations

Journal ArticleDOI
TL;DR: In this paper, a firing scheme based on a microprocessor to control an antiparallel-connected three-phase thyristor dual converter is presented, using table-look-up algorithm to speed up the response.
Abstract: A firing scheme based on a microprocessor to control an antiparallel-connected three-phase thyristor dual converter is presented. Using table-look-up algorithm to speed up the response, it gives a full range control of the firing angle between 0° and 180° for both positive and negative current control. The maximum time delay required to correct the firing angle is one-sixth period of the ac power source. The firing angle between 120° and 180° is used for the regeneration braking to achieve the required dynamic performance in four quadrants. Built with all digital circuits with no further adjustment, this system is more reliable and has lower cost.

34 citations

Journal ArticleDOI
TL;DR: In this article, a new simple equidistant pulse firing scheme was proposed for three-phase Graetz bridge converters employing equideistant pulses for high voltage dc transmission, which is intended to be economically quite competitive to the presently existing individual phase control circuits used in 3-phase converter circuits for industrial applications.
Abstract: From the literature published, six different gate firing schemes are available for three-phase thyristor Graetz bridge converters employing equidistant pulses. All these thyristor firing schemes have been developed with particular attention to the special control requirements of converters used in a high voltage dc transmission scheme. Herein is described a new simple equidistant pulse firing scheme intended to be economically quite competitive to the presently existing individual phase control circuits used in three-phase converter circuits for industrial applications. The princidple of operation and the circuit details of the firing circuit are described. Experimental results obtained on a laboratory dc drive of capacity 3 KVA are discussed.

25 citations

Journal ArticleDOI
TL;DR: In this paper, a compact scheme using minimum integrated circuit components is described, which has a fast response for triggering angle correction and gives a full range control of voltage for three-phase SCR bridge rectifiers.
Abstract: Existing firing schemes for the firing of three-phase SCR bridge rectifiers used for industrial applications employ equidistant firing pulses. Mostly they consist of six identical phase control circuits. In this paper a compact scheme using minimum integrated circuit components is described. It has a fast response for triggering angle correction and gives a full range control of voltage.

20 citations

Journal ArticleDOI
TL;DR: In this paper, a novel trigger control scheme for thyristors operating under variable-frequency anode supply is described, which uses a zero crossing detector and a novel time delay circuit.
Abstract: A novel trigger control scheme for thyristors operating under variable-frequency anode supply is described. The scheme uses a zero crossing detector and a novel time delay circuit. A few applications are suggested.

15 citations