Consider the following statements: HVDC transmission is superior to HVAC transmission due to1.Lack of reliable DC circuit breakers.2.Lesser number of conductors for same power carrying capacity.3.Non-synchronous link between the two different systems simplifying the problem of voltage stability and frequency control.4.No costly terminal equipment such as converters and inverters are required.Which of these statements is/are correct?

Correct Answer: B - 2 and 3 only

Quick Concept Explanation

HVDC converts AC to DC for transmission and back to AC at the receiving end. HVDC can interconnect asynchronous AC systems. Key relation: Typical chain: AC generation → rectifier → DC link → inverter → AC grid/distribution.

Exam focus: HVDC advantage is in the link, not DC generation/distribution in conventional grids. Common trap: Do not claim HVDC eliminates converter terminal equipment.

Statement-wise Verification

• Statement 1 - Incorrect.
  Lack of reliable DC circuit breakers.
  A limitation is not an advantage of HVDC over HVAC
• Statement 2 - Correct.
  Lesser number of conductors for same power carrying capacity.
  HVDC can interconnect asynchronous AC systems.
• Statement 3 - Correct.
  Non-synchronous link between the two different systems simplifying the problem of voltage stability and frequency control.
  HVDC can interconnect asynchronous AC systems.
• Statement 4 - Incorrect.
  No costly terminal equipment such as converters and inverters are required.
  HVDC requires costly converter stations at terminals

Core Concept

HVDC converts AC to DC for transmission and back to AC at the receiving end. Long lines/cables avoid charging current and skin effect and can have lower losses, but converter stations are costly and LCC schemes consume reactive power. HVDC can interconnect asynchronous AC systems.

Formula / Key Relationship

Typical chain: AC generation → rectifier → DC link → inverter → AC grid/distribution.

Why the Other Options Are Wrong

Option A is incorrect because it includes incorrect statement(s) 4 and omits correct statement(s) 2, 3. Option C is incorrect because it includes incorrect statement(s) 4 and omits correct statement(s) 2. Option D is incorrect because it includes incorrect statement(s) 1 and omits correct statement(s) 3.

Exam Shortcut / Approach

HVDC advantage is in the link, not DC generation/distribution in conventional grids.

Common Mistake

Do not claim HVDC eliminates converter terminal equipment.

Quick Revision

Conductor Count and Asynchronous Interconnection is linked with HVDC versus HVAC, HVDC Transmission and Power Systems. HVDC advantage is in the link, not DC generation/distribution in conventional grids.