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    in circulating current mode dual converters, the circulating current is avoided by

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    Explanation: Dual converter, the name itself says two converters. It is really an electronic converter or circuit which comprises of two converters. One will

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    In a non-circulating current mode dual converters, the circulating current is avoided by

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    Connecting a series reactor

    Maintaining α1 + α2 = 180°

    Operating only one converter

    Adding an extra SCR

    Answer (Detailed Solution Below)

    Option 3 : Operating only one converter

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    Explanation:

    Dual converter, the name itself says two converters. It is really an electronic converter or circuit which comprises of two converters. One will perform as a rectifier and the other will perform as an inverter. Therefore, we can say that double processes will occur at a moment.

    In this, the circulating current allows smooth reversal of load current with improved speed of response. The circulating current helps in maintaining continuous conduction of both the converters irrespective of load and the time response to change the operation from one quadrant to other is faster.

    Modes of Operation of Dual Converter:

    There are two functional modes: Non-circulating current mode and circulating mode.

    Circulating Current Mode:

    Two converters will be in the ON condition at the same time. So, the circulating current is present.

    The firing angles are adjusted such that the firing angle of converter 1 (α1) + firing angle of converter 2 (α2) = 180o.

    Converter 1 performs as a controlled rectifier when firing angle be 0 < α1 < 90o and Converter 2 performs as an inverter when the firing angle be 90o < α2 < 180o. In this condition, Vdc and Idc are positive.

    Converter 1 performs as an inverter when firing angle be 90o < α1 < 180o and Converter 2 performs as a controlled rectifier when the firing angle be 0 < α2 < 90o in this condition, Vdc and Idc are negative.

    Non-Circulating Current Mode:

    The circulating current does exist in both the converter circuits, but it is avoided by using a reactor in non-circulating type and by operating only one circuit in case of circulating type.

    During the converter 1 operation, firing angle (α1) will be 0 < α1 < 90o; Vdc and Idc are positive.

    During the converter 2 operation, firing angle (α2) will be 0 < α2 < 90o; Vdc and Idc are negative.

    Conclusion:

    In a non-circulating dual converter - One converter is operated at a time.

    In circulating current dual converter - reactor + maintaining α1 + α2 = 180°

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    Solved In circulating current mode dual converters, the

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    Dual Conveters Questions and Answers

    This set of Power Electronics Multiple Choice Questions & Answers (MCQs) focuses on “Dual Converters-2”. 1. In circulating current mode dual converters, the circulating current is avoided by a) connecting a series reactor b) maintaining α1 + α2 = 180° c) operating only one converter d) adding an extra SCR 2. Choose the correct statement ... Read more

    Power Electronics Questions and Answers – Dual Converters-2

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    This set of Power Electronics Multiple Choice Questions & Answers (MCQs) focuses on “Dual Converters-2”.

    1. In circulating current mode dual converters, the circulating current is avoided by

    a) connecting a series reactor

    b) maintaining α1 + α2 = 180°

    c) operating only one converter

    d) adding an extra SCR

    View Answer

    2. Choose the correct statement

    a) Circulating current exists only in circulating current mode

    b) Circulating current exists only in non-circulating current mode

    c) Circulating current exists in both the circulating and non-circulating current mode

    d) none of the mentioned

    View Answer

    3. What causes circulating current in dual converters?

    a) Temperature issues

    b) Inductance in load circuit

    c) Out of phase voltages from both the converters

    d) none of the mentioned

    View Answer

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    4. Name the below given circuit.

    a) Single-phase dual converter with circulating current type

    b) Single-phase dual converter with non-circulating current type

    c) Three-phase dual converter with non-circulating current type

    d) Three-phase dual converter with circulating current type

    View Answer

    5. In case of three-phase dual converter, one of the converter circuits is fired at an angle of 60°. For both the converter circuits to have equal average output voltage, what is the value of the firing angle for the other converter circuit?

    a) 60° b) 120° c) 100°

    d) Insufficient data

    View Answer

    Check this: Power Electronics Books | Electrical & Electronics Engineering MCQs

    6. In case of circulating current type dual converters, the reactor is inserted between

    a) supply and converter

    b) across the load

    c) between the converters

    d) no reactor is used in case of circulating type dual converter

    View Answer

    7. Choose the correct statement.

    a) Circulating current type is faster in operation

    b) Non-circulating current type is faster in operation

    c) Both the types have the same speed of operation

    d) Circulating current improves power factor

    View Answer advertisement

    8. Circulating current flows

    a) from load to converters

    b) from one converter to another converter

    c) in the whole circuit

    d) none of the mentioned

    View Answer

    9. The reactor in circulating current type dual converters

    a) increases losses

    b) reduces power factor

    c) increase the weight of the circuit

    d) all of the above View Answer advertisement

    10. If V1 and V2 are the instantaneous voltages of the two converter circuits in the dual convert, then the output voltage is

    a) V1 + V2 b) (V1 + V2)/2 c) V1 – V2 d) 2(V1 + V2) View Answer

    Sanfoundry Global Education & Learning Series – Power Electronics.

    To practice all areas of Power Electronics, here is complete set of 1000+ Multiple Choice Questions and Answers.

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