Thyristor Power Controllers Research Articles

Generation and radiation of high power line harmonics

The problems of frequency spectrum generation, radiation, and reception of signals at high power line (PL) harmonics of 50/60 Hz, and high PL harmonics caused by the use of thyristor power controllers in control circuits of large electricity consumers are discussed. The PL for frequencies of 2–8 kHz is considered a sufficiently effective traveling-wave antenna (the so-called Beverage antenna). The response of the spectrometer to a periodic sequence of PL radiation broadband pulses is discussed. The effects of a slow signal frequency drift at high PL harmonics and the occurrence of pulse components with fast frequency drift on the dynamic spectra, which in the literature is often associated with the magnetospheric trigger radiation, are considered.

Power Factor Correction for Thyristor Equipment in Glass Industry

Thyristor power controllers are now widely used in the glass industry for controlling furnace temperature. While offering a number of operational advantages, they operate at lagging power factors which require correction for minimum power cost. Harmonic resonance with the utility feed, however, complicate the use of capacitor banks. The nature of harmonic problems is described and the use of inductors to tune capacitor banks below any possible harmonic frequency is demonstrated.The Information Manager Vol. 8 (1) 2008: pp. 22-26

Zero-voltage-fired transformer-coupled thyristor power control applied for temperature control of the tin bath in the float glass process

A novel thyristor-based power circuit is described that substitutes zero-voltage-fired time-proportioning control and thus allows fewer transformer taps while causing no degradation of circuit power factor. Harmonic distortion usually associated with phase angle control in this application is eliminated. A system description outlining power requirements, a comparison of power factor costs, and system design philosophy are provided along with some operational history and an explanation of the thyristor control.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Power factor correction for thyristor equipment in the glass industry

Thyristor power controllers are now widely used in the glass industry for controlling furnace temperature. While offering a number of operational advantages, they operate at lagging power factors, which require correction for minimum power cost. Harmonic resonances with the utility feed, however, complicate the use of capacitor banks. The nature of harmonic problems is described and the use of inductors to tune capacitor banks below any possible harmonic frequency is demonstrated. An example design procedure is covered.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Thyristor power control in heating applications

The application of thyristors to industrial power control gives improved reliability, efficiency and accuracy. Modern devices may be applied to a wide range of loads and uses

A ROM-controlled thyristor trigger circuit

A circuit for application in microprocessor-based thyristorpower control is proposed. We specify the READ-ONLY memory (ROM) for linear average output voltage control design and for linear average output power control design.

A digitally controlled thyristor trigger circuit

A high-performance thyristor trigger circuit in which the delay angle is controlled by an eight-bit digital word is described. Application of the proposed circuit in microprocessor-based thyristor power-control systems is discussed.

Thyristor Power Control with Less Third Harmonic Component

Thyristor Power Control with Less Third Harmonic Component