Join 60,000+ competitive exam aspirants
or with email
Your Cart
Subtotal₹0
Total₹0
Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
Join 60,000+ competitive exam aspirants
Secure dispatch is the state of power system where
Contingency outage is always present
Contingency outage is not present
Security is not present
All of above
Contingency outage is not present
Quick Summary: Secure dispatch refers to the operational state of a power system where all components are within their thermal and stability limits, and no contingency outages are currently affecting the system's performance. It ensures that the power system remains in a 'Normal' or 'Alert' state, capable of maintaining supply even if a single component fails.
Secure dispatch refers to the operational state of a power system where all components are within their thermal and stability limits, and no contingency outages are currently affecting the system's performance. It ensures that the power system remains in a 'Normal' or 'Alert' state, capable of maintaining supply even if a single component fails.
N−1 Criterion⟹System remains stable under any single contingency outage
∑Pgen=∑Pload+Plosses
The system monitors bus voltages and line flows using a State Estimator. It verifies the N-1 security criterion, which mandates that the system remains stable even if one major component (generator or transmission line) undergoes an unplanned outage. Secure dispatch optimizes generation schedules such that Pgen=Pload+Ploss while satisfying inequality constraints like ∣Sline∣≤Smax and Vmin≤∣V∣≤Vmax.
Security is defined as the ability of the system to withstand a sudden disturbance.
Secure dispatch implies the absence of current emergency conditions.
Power system security is categorized into Normal, Alert, Emergency, and Restoration states.
Contingency analysis is performed to ensure the system is 'Secure'.
Minimizes risk of cascading failures.
Ensures continuous and reliable power supply to consumers.
Increases operational costs due to reserve requirements.
Requires complex real-time computational monitoring.
Energy Management Systems (EMS) in Load Dispatch Centers.
Real-time grid stability control.
The 'N-1' criteria implies that for a secure state, the loss of any single major element should not cause a violation of system limits.
Option A is incorrect because if a contingency outage were present, the system would typically be in an 'Emergency' or 'Alert' state, not a 'Secure' state.
B is correct — Secure dispatch is achieved when the system operates within limits with no ongoing contingency outages.
Always remember the difference between 'Reliability' (long-term adequacy) and 'Security' (short-term operational state).