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    Concordia University Department of Electrical and Computer Engineering Power Electronics (I) ELEC-433/6411 Assignment #5: HVDC and AC Controller

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    AndrewJohnsonJensson
    This document contains two assignments related to power electronics. The first assignment involves calculating parameters like the minimum extinction angle and maximum power transfer for a 6-pulse HVDC system connecting two AC systems with different frequencies. The second assignment involves calculating inductance and capacitance values needed for reactive power compensation using thyristor-controlled reactors (TCRs) and thyristor-switched capacitors (TSCs) connected to a transmission line.

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    Concordia University Department of Electrical and Computer Engineering Power Electronics (I) ELEC-433/6411 Assignment #5: HVDC and AC Controller

    Uploaded by

    AndrewJohnsonJensson
    66 views2 pages
    This document contains two assignments related to power electronics. The first assignment involves calculating parameters like the minimum extinction angle and maximum power transfer for a 6-pulse HVDC system connecting two AC systems with different frequencies. The second assignment involves calculating inductance and capacitance values needed for reactive power compensation using thyristor-controlled reactors (TCRs) and thyristor-switched capacitors (TSCs) connected to a transmission line.

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    Assignment5-2015

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    This document contains two assignments related to power electronics. The first assignment involves calculating parameters like the minimum extinction angle and maximum power transfer for a 6-pulse HVDC system connecting two AC systems with different frequencies. The second assignment involves calculating inductance and capacitance values needed for reactive power compensation using thyristor-controlled reactors (TCRs) and thyristor-switched capacitors (TSCs) connected to a transmission line.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    66 views2 pages

    Concordia University Department of Electrical and Computer Engineering Power Electronics (I) ELEC-433/6411 Assignment #5: HVDC and AC Controller

    Uploaded by

    AndrewJohnsonJensson
    This document contains two assignments related to power electronics. The first assignment involves calculating parameters like the minimum extinction angle and maximum power transfer for a 6-pulse HVDC system connecting two AC systems with different frequencies. The second assignment involves calculating inductance and capacitance values needed for reactive power compensation using thyristor-controlled reactors (TCRs) and thyristor-switched capacitors (TSCs) connected to a transmission line.

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    CONCORDIA UNIVERSITY

    DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING


    Power Electronics (I) ELEC-433/6411
    Assignment #5: HVDC and AC controller
    Due date: December 8, 2015, at 6:00 PM in the mailbox of Dr. Lopes (EV5.175).
    1) The elementary 6-pulse HVDC system shown below is used to connect 2 ac systems of
    different frequencies. The line resistance is equal to 1.2. The line inductance can be
    neglected in this study. Both ac systems are rated at 25 kV and are to be represented by ideal
    ac sources. The frequency at the left-hand side is 60 Hz and at the right-hand side is 50 Hz.
    The HVDC terminals are implemented with valves of the T1901N SCR from Infineon that
    presents: ITAVMax = 2.1 kA, VDRMax/RRMax = 8 kV and tq (minimum reverse blocking, or turnoff, time) = 550 us. A) For power flowing from the left- to the right-hand side, what would
    be the minimum extinction angle (min) one could use safely, without risking commutation
    failures? For the following calculations, consider that an extinction angle of 2 min is used in
    the inverter terminal. B) What is the maximum active power that could be transmitted in the
    system in this case? C) Compute (Q3), the reactive power absorbed by both converters,
    rectifier and inverter, for this condition. D) What should be the frequencies of the tuned
    filters in the DC and AC sides of the converters, rectifier and inverter? E) How many SCRs
    would one need in series to withstand the voltage imposed in each valve of SCRs?

    2) Consider a 6-pulse (-connected) TCR connected to a transmission line by means of a 500


    kVLL/18 kVLL coupling transformer. A) What should be the value of the required inductances
    so that the three-phase TCR can absorb a maximum of 60 MVAr? B) How much reactive
    power would it absorb when the firing angle of the thyristors is 150? C) Draw the following
    waveforms for = 120: (i) line voltage in the output of the transformer, (ii) voltage across
    one inductor, (iii) voltage across the antiparallel thyristors and (iv) current through the
    inductor. Hint: consider the KVL for one phase of the three-phase TCR. Now assume that
    2 three-phase Y-connected TSCs, rated at 30 MVA each, are placed in parallel with the TCR,
    in the secondary of the coupling transformer. D) What should be the value of the
    capacitances of each element of the TSCs? E) Assuming that the TSC was previously in
    service (Vcap not zero), draw the following waveforms when the thyristors of the TSC are
    not being fired: (i) voltage across one phase of the TSC (input voltage), (ii) voltage across
    one capacitor, (iii) voltage across the antiparallel thyristors. Identify the maximum voltage
    across the thyristors. Recall that the thyristors should be rated to withstand this voltage level.
    Hint: consider the KVL for one phase of the three-phase TSC.

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