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Compensators

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Rahmat-allah Hooshmand – One of the best experts on this subject based on the ideXlab platform.

Torabian Esfahani – One of the best experts on this subject based on the ideXlab platform.

  • Adaptive filter design based on the LMS algorithm for delay elimination in TCR/FC Compensators.
    ISA Transactions, 2011
    Co-Authors: Rahmat-allah Hooshmand, Torabian Esfahani
    Abstract:

    Thyristor controlled reactor with fixed capacitor (TCR/FC) Compensators have the capability of compensating reactive power and improving power quality phenomena. Delay in the response of such Compensators degrades their performance. In this paper, a new method based on adaptive filters (AF) is proposed in order to eliminate delay and increase the response of the TCR compensator. The algorithm designed for the adaptive filters is performed based on the least mean square (LMS) algorithm. In this design, instead of fixed capacitors, band-pass LC filters are used. To evaluate the filter, a TCR/FC compensator was used for nonlinear and time varying loads of electric arc furnaces (EAFs). These loads caused occurrence of power quality phenomena in the supplying system, such as voltage fluctuation and flicker, odd and even harmonics and unbalancing in voltage and current. The above design was implemented in a realistic system model of a steel complex. The simulation results show that applying the proposed control in the TCR/FC compensator efficiently eliminated delay in the response and improved the performance of the compensator in the power system.

Mahdi Torabian Esfahani – One of the best experts on this subject based on the ideXlab platform.

  • adaptive filter design based on the lms algorithm for delay elimination in tcr fc Compensators
    Isa Transactions, 2011
    Co-Authors: Rahmat-allah Hooshmand, Mahdi Torabian Esfahani
    Abstract:

    Thyristor controlled reactor with fixed capacitor (TCR/FC) Compensators have the capability of compensating reactive power and improving power quality phenomena. Delay in the response of such Compensators degrades their performance. In this paper, a new method based on adaptive filters (AF) is proposed in order to eliminate delay and increase the response of the TCR compensator. The algorithm designed for the adaptive filters is performed based on the least mean square (LMS) algorithm. In this design, instead of fixed capacitors, band-pass LC filters are used. To evaluate the filter, a TCR/FC compensator was used for nonlinear and time varying loads of electric arc furnaces (EAFs). These loads caused occurrence of power quality phenomena in the supplying system, such as voltage fluctuation and flicker, odd and even harmonics and unbalancing in voltage and current. The above design was implemented in a realistic system model of a steel complex. The simulation results show that applying the proposed control in the TCR/FC compensator efficiently eliminated delay in the response and improved the performance of the compensator in the power system.

Fridtjof Nüsslin – One of the best experts on this subject based on the ideXlab platform.

  • Compensators for IMRT–an investigation in quality assurance.
    Zeitschrift fur medizinische Physik, 2001
    Co-Authors: Annemarie Bakai, Wolfram Laub, Fridtjof Nüsslin
    Abstract:

    Intensity modulated radiotherapy (IMRT) allows dose distributions which adequately consider organs at risk (OAR) and dose homogeneity to the target volume. This is practically reached by conforming the beam profiles to the shape of the planning target volume (PTV), by shaping the fluence with multileaf collimators (MLC) or Compensators. Though compensator production is time consuming and seems less convenient than the use of MLC, Compensators offer much easier quality assurance. In this study the effects of certain simplifications of compensator production were studied. Compensators were produced and ionization chamber measurements in a water phantom and film measurements in a solid phantom were performed to verify the Compensators. The results of the measurements were compared to the fluence distributions given by the planning system. The measurements were meant to show how realistic the investigated simplifications were, and to reveal a suitable and reliable testing method for Compensators. Monte-Carlo calculations employing the EGS 4 Code were further performed to support the measurements.

L. Gerin-lajoie – One of the best experts on this subject based on the ideXlab platform.

  • A static compensator model for the EMTP
    IEEE Transactions on Power Systems, 1992
    Co-Authors: Serge Lefebvre, L. Gerin-lajoie
    Abstract:

    A static voltampere-reactive (VAr) compensator (SVC) model based on nodal analysis, is presented. The model is integrated in the electromagnetic transients program (EMTP) with minimal interface error and by taking into account initialization. The model is basically a generic compensator using thyristor controlled reactors. The models are modular to represent adequately Compensators of different designs while being detailed enough for predicting possible harmonic interactions between the AC system and the SVC. Typical applications on the Hydro-Quebec system are described. >