Choose the correct option. Statement-1: Voltage instability is more severe at the voltage setting terminal (VST) compared to other terminals irrespective of whether it is rectifier or inverter in HVDC system. Statement-2: Constant AC voltage control at VST improves voltage stability at all terminal including VST without any coordination.
Answer & step-by-step solution
Voltage instability in an MTDC/HVDC network is strongly influenced by which terminal regulates DC voltage and by whether that terminal is operating as rectifier or inverter; it is not universally “more severe at the VST irrespective of mode.” The correct truth combination in the source is option B.
Concept and Reasoning
Voltage instability in an MTDC/HVDC network is strongly influenced by which terminal regulates DC voltage and by whether that terminal is operating as rectifier or inverter; it is not universally “more severe at the VST irrespective of mode.” The correct truth combination in the source is option B.
Calculation / Key Relation
DC-network voltage stability depends on converter control mode and network operating point
Exam Takeaway
Statements containing “irrespective of rectifier/inverter operation” deserve careful scrutiny.
Common Mistake
Do not generalize voltage-stability behavior without considering converter operating mode and control characteristic.
Quick Trick
Statements containing “irrespective of rectifier/inverter operation” deserve careful scrutiny.
सही विकल्प चुनिए।
कथन-1: HVDC प्रणाली में वोल्टेज सेटिंग टर्मिनल (VST) पर वोल्टेज अस्थिरता अन्य टर्मिनलों की तुलना में अधिक गंभीर होती है, चाहे वह रेक्टिफायर हो या इन्वर्टर।
कथन-2: VST पर स्थिर AC वोल्टेज नियंत्रण बिना किसी समन्वय के VST सहित सभी टर्मिनलों पर वोल्टेज स्थिरता सुधारता है।
उत्तर और चरणबद्ध हल
B — कथन-1 सत्य, कथन-2 असत्य (स्रोत कुंजी)। MTDC में वोल्टेज अस्थिरता उस टर्मिनल पर अधिक गंभीर होती है जो DC वोल्टेज तय करता है। केवल VST पर स्थिर AC वोल्टेज नियंत्रण, बिना समन्वय के, सभी टर्मिनलों पर स्थिरता नहीं सुधारता।
विस्तृत हल (मूल भाषा में)
Concept and Reasoning
Voltage instability in an MTDC/HVDC network is strongly influenced by which terminal regulates DC voltage and by whether that terminal is operating as rectifier or inverter; it is not universally “more severe at the VST irrespective of mode.” The correct truth combination in the source is option B.
Calculation / Key Relation
DC-network voltage stability depends on converter control mode and network operating point
Exam Takeaway
Statements containing “irrespective of rectifier/inverter operation” deserve careful scrutiny.
Common Mistake
Do not generalize voltage-stability behavior without considering converter operating mode and control characteristic.
Quick Trick
Statements containing “irrespective of rectifier/inverter operation” deserve careful scrutiny.
સાચો વિકલ્પ પસંદ કરો.
વિધાન-1: HVDC પ્રણાલીમાં વોલ્ટેજ સેટિંગ ટર્મિનલ (VST) પર વોલ્ટેજ અસ્થિરતા અન્ય ટર્મિનલ કરતાં વધુ ગંભીર હોય છે, પછી તે રેક્ટિફાયર હોય કે ઇન્વર્ટર.
વિધાન-2: VST પર અચળ AC વોલ્ટેજ નિયંત્રણ કોઈ સંકલન વિના VST સહિત તમામ ટર્મિનલ પર વોલ્ટેજ સ્થિરતા સુધારે છે.
જવાબ અને પગલાવાર ઉકેલ
B — વિધાન-1 સાચું, વિધાન-2 ખોટું (સ્રોત કી). MTDCમાં વોલ્ટેજ અસ્થિરતા DC વોલ્ટેજ નક્કી કરતા ટર્મિનલ પર વધુ ગંભીર હોય છે. ફક્ત VST પર અચળ AC વોલ્ટેજ નિયંત્રણ, સંકલન વિના, તમામ ટર્મિનલ પર સ્થિરતા સુધારતું નથી.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
Concept and Reasoning
Voltage instability in an MTDC/HVDC network is strongly influenced by which terminal regulates DC voltage and by whether that terminal is operating as rectifier or inverter; it is not universally “more severe at the VST irrespective of mode.” The correct truth combination in the source is option B.
Calculation / Key Relation
DC-network voltage stability depends on converter control mode and network operating point
Exam Takeaway
Statements containing “irrespective of rectifier/inverter operation” deserve careful scrutiny.
Common Mistake
Do not generalize voltage-stability behavior without considering converter operating mode and control characteristic.
Quick Trick
Statements containing “irrespective of rectifier/inverter operation” deserve careful scrutiny.
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