Consider the following statements:
1. MTDC involves more than two converter stations.
2. Power flow control is more complex in MTDC.
3. MTDC cannot be implemented using VSC technology.
Which options stated above is/are correct?
Answer & step-by-step solution
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. 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 - Correct.
MTDC involves more than two converter stations.
Converter stations are costly and LCC schemes consume reactive power. - Statement 2 - Correct.
Power flow control is more complex in MTDC.
HVDC can interconnect asynchronous AC systems. - Statement 3 - Incorrect.
MTDC cannot be implemented using VSC technology.
VSC technology is well suited to multi-terminal DC networks
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 omits correct statement(s) 2. Option B is incorrect because it omits correct statement(s) 1. Option D is incorrect because it includes incorrect 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
MTDC Configuration and Power Flow is linked with Multi-Terminal HVDC, HVDC Transmission and Power Systems. HVDC advantage is in the link, not DC generation/distribution in conventional grids.
निम्नलिखित कथनों पर विचार कीजिए:
1. MTDC में दो से अधिक कन्वर्टर स्टेशन होते हैं।
2. MTDC में शक्ति प्रवाह नियंत्रण अधिक जटिल होता है।
3. MTDC को VSC तकनीक से लागू नहीं किया जा सकता।
ऊपर बताए गए कौन-से विकल्प सही हैं?
उत्तर और चरणबद्ध हल
C — केवल 1 और 2। मल्टी-टर्मिनल DC (MTDC) में दो से अधिक कन्वर्टर स्टेशन होते हैं, इसलिए शक्ति प्रवाह समन्वय अधिक जटिल है। VSC तकनीक MTDC के लिए बहुत उपयुक्त है (धारा उलटे बिना शक्ति दिशा बदल सकती है), इसलिए कथन 3 गलत है।
विस्तृत हल (मूल भाषा में)
Statement-wise Verification
- Statement 1 - Correct.
MTDC involves more than two converter stations.
Converter stations are costly and LCC schemes consume reactive power. - Statement 2 - Correct.
Power flow control is more complex in MTDC.
HVDC can interconnect asynchronous AC systems. - Statement 3 - Incorrect.
MTDC cannot be implemented using VSC technology.
VSC technology is well suited to multi-terminal DC networks
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 omits correct statement(s) 2. Option B is incorrect because it omits correct statement(s) 1. Option D is incorrect because it includes incorrect 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
MTDC Configuration and Power Flow is linked with Multi-Terminal HVDC, HVDC Transmission and Power Systems. HVDC advantage is in the link, not DC generation/distribution in conventional grids.
નીચેનાં વિધાનો ધ્યાનમાં લો:
1. MTDCમાં બે કરતાં વધુ કન્વર્ટર સ્ટેશન હોય છે.
2. MTDCમાં પાવર પ્રવાહ નિયંત્રણ વધુ જટિલ હોય છે.
3. MTDCને VSC ટેકનોલોજીથી લાગુ કરી શકાતું નથી.
ઉપર જણાવેલા કયા વિકલ્પો સાચા છે?
જવાબ અને પગલાવાર ઉકેલ
C — ફક્ત 1 અને 2. મલ્ટિ-ટર્મિનલ DC (MTDC)માં બે કરતાં વધુ કન્વર્ટર સ્ટેશન હોય છે, તેથી પાવર પ્રવાહ સંકલન વધુ જટિલ છે. VSC ટેકનોલોજી MTDC માટે ખૂબ યોગ્ય છે (પ્રવાહ ઉલટાવ્યા વિના પાવર દિશા બદલી શકે છે), તેથી વિધાન 3 ખોટું છે.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
Statement-wise Verification
- Statement 1 - Correct.
MTDC involves more than two converter stations.
Converter stations are costly and LCC schemes consume reactive power. - Statement 2 - Correct.
Power flow control is more complex in MTDC.
HVDC can interconnect asynchronous AC systems. - Statement 3 - Incorrect.
MTDC cannot be implemented using VSC technology.
VSC technology is well suited to multi-terminal DC networks
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 omits correct statement(s) 2. Option B is incorrect because it omits correct statement(s) 1. Option D is incorrect because it includes incorrect 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
MTDC Configuration and Power Flow is linked with Multi-Terminal HVDC, HVDC Transmission and Power Systems. HVDC advantage is in the link, not DC generation/distribution in conventional grids.
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