In which of the multi-terminal direct current (MTDC) systems, the reversal of power without using mechanical switch is possible?
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Answer & Explanation
Correct AnswerA. SeriesTDC system
Quick Explanation
In a series-connected MTDC arrangement the same DC current flows through the terminals, and power reversal at a terminal can be achieved by reversing its DC voltage polarity while current direction is maintained. This permits electrical power reversal without a mechanical DC switching operation, as identified in option A.
Formula / Key Relation
Pdc=Vdc Id; reverse Vdc polarity with Id direction maintained → reverse power
Detailed Explanation
Correct Answer
A — Series MTDC system
Concept and Reasoning
In a series-connected MTDC arrangement the same DC current flows through the terminals, and power reversal at a terminal can be achieved by reversing its DC voltage polarity while current direction is maintained. This permits electrical power reversal without a mechanical DC switching operation, as identified in option A.
Calculation / Key Relation
Pdc=Vdc Id
reverse Vdc polarity with Id direction maintained → reverse power
Exam Takeaway
Series MTDC power control is naturally associated with terminal voltage polarity.
Common Mistake
Do not assume all MTDC configurations reverse power in the same way.
Quick Trick
Series MTDC power control is naturally associated with terminal voltage polarity.
Common Mistake
Do not assume all MTDC configurations reverse power in the same way.
Exam Tip
Series MTDC power control is naturally associated with terminal voltage polarity.
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