Stability of a power system can be improved by
1. Using series compensations
2. Using parallel transmission lines
3. Reducing voltage of transmissionWhich of the above statements are correct?
Answer & step-by-step solution
Power-system stability concerns the ability of synchronous machines and network states to remain or return to acceptable operation after disturbances. Series compensation can increase transfer capability by reducing effective reactance, and parallel transmission paths can reduce transfer reactance. Key relation: Simplified transfer P≈(EV/X)sinδ; reducing effective X raises transfer capability.
Exam focus: Lower transfer reactance generally improves synchronizing power margin. Common trap: Do not confuse ordinary load flow with a dynamic stability study.
Statement-wise Verification
- Statement 1 - Correct.
Using series compensations
Series compensation can increase transfer capability by reducing effective reactance, and parallel transmission paths can reduce transfer reactance. - Statement 2 - Correct.
Using parallel transmission lines
Series compensation can increase transfer capability by reducing effective reactance, and parallel transmission paths can reduce transfer reactance. - Statement 3 - Incorrect.
Reducing voltage of transmission
Lower transmission voltage generally worsens power-transfer capability/stability; higher voltage helps
Core Concept
Power-system stability concerns the ability of synchronous machines and network states to remain or return to acceptable operation after disturbances. Series compensation can increase transfer capability by reducing effective reactance, and parallel transmission paths can reduce transfer reactance. Stability studies focus strongly on rotor-angle/electromechanical dynamics rather than ordinary steady-state voltage calculation alone.
Formula / Key Relationship
Simplified transfer P≈(EV/X)sinδ; reducing effective X raises transfer capability.
Why the Other Options Are Wrong
Option A is incorrect because it omits correct statement(s) 2. Option B is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 1.
Exam Shortcut / Approach
Lower transfer reactance generally improves synchronizing power margin.
Common Mistake
Do not confuse ordinary load flow with a dynamic stability study.
Quick Revision
Series Compensation and Parallel Lines is linked with Stability Improvement, Power System Stability and Power Systems. Lower transfer reactance generally improves synchronizing power margin.
पावर सिस्टम की स्थिरता सुधारी जा सकती है
1. श्रेणी क्षतिपूर्ति (series compensation) का उपयोग करके
2. समानांतर पारेषण लाइनों का उपयोग करके
3. पारेषण वोल्टेज घटाकर
उपरोक्त में से कौन-से कथन सही हैं?
उत्तर और चरणबद्ध हल
D — केवल 1 और 2। P ≈ (EV/X)sinδ; श्रेणी क्षतिपूर्ति और समानांतर लाइनें प्रभावी X घटाकर Pmax और स्थिरता मार्जिन बढ़ाती हैं। वोल्टेज घटाने से Pmax घटता है, इसलिए स्थिरता बिगड़ती है।
विस्तृत हल (मूल भाषा में)
Statement-wise Verification
- Statement 1 - Correct.
Using series compensations
Series compensation can increase transfer capability by reducing effective reactance, and parallel transmission paths can reduce transfer reactance. - Statement 2 - Correct.
Using parallel transmission lines
Series compensation can increase transfer capability by reducing effective reactance, and parallel transmission paths can reduce transfer reactance. - Statement 3 - Incorrect.
Reducing voltage of transmission
Lower transmission voltage generally worsens power-transfer capability/stability; higher voltage helps
Core Concept
Power-system stability concerns the ability of synchronous machines and network states to remain or return to acceptable operation after disturbances. Series compensation can increase transfer capability by reducing effective reactance, and parallel transmission paths can reduce transfer reactance. Stability studies focus strongly on rotor-angle/electromechanical dynamics rather than ordinary steady-state voltage calculation alone.
Formula / Key Relationship
Simplified transfer P≈(EV/X)sinδ; reducing effective X raises transfer capability.
Why the Other Options Are Wrong
Option A is incorrect because it omits correct statement(s) 2. Option B is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 1.
Exam Shortcut / Approach
Lower transfer reactance generally improves synchronizing power margin.
Common Mistake
Do not confuse ordinary load flow with a dynamic stability study.
Quick Revision
Series Compensation and Parallel Lines is linked with Stability Improvement, Power System Stability and Power Systems. Lower transfer reactance generally improves synchronizing power margin.
પાવર સિસ્ટમની સ્થિરતા સુધારી શકાય છે
1. શ્રેણી વળતર (series compensation)નો ઉપયોગ કરીને
2. સમાંતર પારેષણ લાઇનોનો ઉપયોગ કરીને
3. પારેષણ વોલ્ટેજ ઘટાડીને
ઉપરોક્તમાંથી કયાં વિધાનો સાચાં છે?
જવાબ અને પગલાવાર ઉકેલ
D — ફક્ત 1 અને 2. P ≈ (EV/X)sinδ; શ્રેણી વળતર અને સમાંતર લાઇનો અસરકારક X ઘટાડીને Pmax અને સ્થિરતા માર્જિન વધારે છે. વોલ્ટેજ ઘટાડવાથી Pmax ઘટે છે, તેથી સ્થિરતા બગડે છે.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
Statement-wise Verification
- Statement 1 - Correct.
Using series compensations
Series compensation can increase transfer capability by reducing effective reactance, and parallel transmission paths can reduce transfer reactance. - Statement 2 - Correct.
Using parallel transmission lines
Series compensation can increase transfer capability by reducing effective reactance, and parallel transmission paths can reduce transfer reactance. - Statement 3 - Incorrect.
Reducing voltage of transmission
Lower transmission voltage generally worsens power-transfer capability/stability; higher voltage helps
Core Concept
Power-system stability concerns the ability of synchronous machines and network states to remain or return to acceptable operation after disturbances. Series compensation can increase transfer capability by reducing effective reactance, and parallel transmission paths can reduce transfer reactance. Stability studies focus strongly on rotor-angle/electromechanical dynamics rather than ordinary steady-state voltage calculation alone.
Formula / Key Relationship
Simplified transfer P≈(EV/X)sinδ; reducing effective X raises transfer capability.
Why the Other Options Are Wrong
Option A is incorrect because it omits correct statement(s) 2. Option B is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 1.
Exam Shortcut / Approach
Lower transfer reactance generally improves synchronizing power margin.
Common Mistake
Do not confuse ordinary load flow with a dynamic stability study.
Quick Revision
Series Compensation and Parallel Lines is linked with Stability Improvement, Power System Stability and Power Systems. Lower transfer reactance generally improves synchronizing power margin.
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