HVDC પારેષણ અંગે નીચેનાં વિધાનો ધ્યાનમાં લો:
1. લાંબા અંતરે HVDC પારેષણમાં HVAC કરતાં ઓછો લાઇન લોસ થાય છે.
2. HVDCને કન્વર્ટર સ્ટેશનો પર પ્રતિક્રિયાશીલ પાવર વળતર જોઈએ.
3. DC પારેષણ લાઇનોમાં સ્કિન ઇફેક્ટ ગેરહાજર હોય છે.
ઉપર જણાવેલા કયા વિકલ્પો સાચા છે?
જવાબ અને પગલાવાર ઉકેલ
D — 1, 2 અને 3. લાંબી HVDC લાઇનોમાં ચાર્જિંગ પ્રવાહ અને સ્કિન ઇફેક્ટ હોતાં નથી, તેથી લોસ ઓછો થાય છે; પણ LCC કન્વર્ટર સ્ટેશનો પ્રતિક્રિયાશીલ પાવર વાપરે છે, તેથી ત્યાં વળતર જોઈએ.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
Statement-wise Verification
- Statement 1 - Correct.
HVDC transmission has lower line losses compared to HVAC over long distances.
HVDC converts AC to DC for transmission and back to AC at the receiving end. - Statement 2 - Correct.
HVDC requires reactive power compensation at converter stations.
Converter stations are costly and LCC schemes consume reactive power. - Statement 3 - Correct.
Skin effect is absent in DC transmission lines.
Long lines/cables avoid charging current and skin effect and can have lower losses
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) 3. Option B is incorrect because it omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 2.
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
Losses Reactive Power and Skin Effect is linked with HVDC Fundamentals, HVDC Transmission and Power Systems. HVDC advantage is in the link, not DC generation/distribution in conventional grids.
Consider the following statements regarding HVDC transmission:
1. HVDC transmission has lower line losses compared to HVAC over long distances.
2. HVDC requires reactive power compensation at converter stations.
3. Skin effect is absent in DC transmission lines.
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.
HVDC transmission has lower line losses compared to HVAC over long distances.
HVDC converts AC to DC for transmission and back to AC at the receiving end. - Statement 2 - Correct.
HVDC requires reactive power compensation at converter stations.
Converter stations are costly and LCC schemes consume reactive power. - Statement 3 - Correct.
Skin effect is absent in DC transmission lines.
Long lines/cables avoid charging current and skin effect and can have lower losses
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) 3. Option B is incorrect because it omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 2.
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
Losses Reactive Power and Skin Effect is linked with HVDC Fundamentals, HVDC Transmission and Power Systems. HVDC advantage is in the link, not DC generation/distribution in conventional grids.
HVDC पारेषण के संबंध में निम्नलिखित कथनों पर विचार कीजिए:
1. लंबी दूरी पर HVDC पारेषण में HVAC की तुलना में कम लाइन हानि होती है।
2. HVDC को कन्वर्टर स्टेशनों पर प्रतिक्रियाशील शक्ति क्षतिपूर्ति चाहिए।
3. DC पारेषण लाइनों में स्किन इफेक्ट अनुपस्थित होता है।
ऊपर बताए गए कौन-से विकल्प सही हैं?
उत्तर और चरणबद्ध हल
D — 1, 2 और 3। लंबी HVDC लाइनों में चार्जिंग धारा और स्किन इफेक्ट नहीं होते, इसलिए हानि कम होती है; पर LCC कन्वर्टर स्टेशन प्रतिक्रियाशील शक्ति खपत करते हैं, इसलिए वहाँ क्षतिपूर्ति चाहिए।
विस्तृत हल (मूल भाषा में)
Statement-wise Verification
- Statement 1 - Correct.
HVDC transmission has lower line losses compared to HVAC over long distances.
HVDC converts AC to DC for transmission and back to AC at the receiving end. - Statement 2 - Correct.
HVDC requires reactive power compensation at converter stations.
Converter stations are costly and LCC schemes consume reactive power. - Statement 3 - Correct.
Skin effect is absent in DC transmission lines.
Long lines/cables avoid charging current and skin effect and can have lower losses
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) 3. Option B is incorrect because it omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 2.
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
Losses Reactive Power and Skin Effect is linked with HVDC Fundamentals, HVDC Transmission and Power Systems. HVDC advantage is in the link, not DC generation/distribution in conventional grids.
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