VOLTAGE STABILITY(SYLLABUS MTECH-EPS ELECTIVE II SEM)

UNIT–I: INTRODUCTION TO VOLTAGE STABILITY
Definitions: Voltage Stability, Voltage Collapse, Voltage Security; Physical relation indicating
dependency of voltage on reactive power flow; Factors affecting Voltage collapse and instability;
Previous cases of voltage collapse incidences.
UNIT–II: GRAPHICAL ANALYSIS OF VOLTAGE STABILITY
Comparison of Voltage and angular stability of the system; Graphical Methods describing voltage
collapse phenomenon: P-V and Q-V curves; detailed description of voltage collapse phenomenon
with the help of Q-V curves.

UNIT–III: ANALYSIS OF VOLTAGE STABILITY
Analysis of voltage stability on SMLB system: Analytical treatment and analysis.
Voltage Stability Indices:
Voltage collapse proximity indicator; Determinant of Jacobin as proximity indicators; Voltage
stability margin.
UNIT–IV: POWER SYSTEM LOADS
Loads that influences voltage stability: Discharge lights, Induction Motor, Air-conditioning, heat
pumps, electronic power supplies, OH lines and cables.
Reactive Power Compensation:
Generation and Absorption of reactive power; Series and Shunt compensation; Synchronous
condensers, SVC s; OLTC s; Booster Transformers.
UNIT–V: VOLTAGE STABILITY MARGIN
Stability Margin: Compensated and un-compensated systems.
Voltage Security
Definition; Voltage security; Methods to improve voltage stability and its practical aspects.
TEXT BOOKS:
1. “Performance, operation and control of EHV power transmission system”-
A.CHAKRABARTHY, D.P.KOTARI and A.K.MUKOPADYAY, A.H.Wheeler Publishing, I
Edition, 1995.
2. “Power System Dynamics: Stability and Control” – K.R.PADIYAR, II
Edition, B.S.Publications.
REFERENCE:
1. “Power System Voltage Stability”- C.W.TAYLOR, Mc Graw Hill, 1994.