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SarkariResultOutBMS · 2024

Previous Year Question

The power flow control strategy that is typically used in Series MTDC systems is
  1. to control a constant voltage at all converter stations.
  2. to set current by one of the converter stations and is kept common for all the converter stations.
  3. to control power flow depending on load.
  4. to control power flow depending on frequency.

Correct answer: B

Explanation

Because all terminals in a series MTDC link carry the same DC current, the natural coordinated strategy is to control a common current and regulate each terminal power through its DC voltage. The strategy described in option B is therefore used for series MTDC operation.

Formula

Pi=Vi Id with common Id in a series MTDC link

Step-by-step solution

Power-Flow Control explanatory diagram

Correct Answer

B — to set current by one of the converter stations and is kept common for all the converter stations.

Concept and Reasoning

Because all terminals in a series MTDC link carry the same DC current, the natural coordinated strategy is to control a common current and regulate each terminal power through its DC voltage. The strategy described in option B is therefore used for series MTDC operation.

Calculation / Key Relation

Pi=Vi Id with common Id in a series MTDC link

Exam Takeaway

Series MTDC: one common current, terminal voltage sets terminal power.

Common Mistake

Do not apply the parallel-MTDC common-voltage control concept to a series link.

Common mistake

Do not apply the parallel-MTDC common-voltage control concept to a series link.

Exam tip

Series MTDC: one common current, terminal voltage sets terminal power.

Quick method

Series MTDC: one common current, terminal voltage sets terminal power.