V&R Energy: POM Applications Suite for Transmission System Analysis and Optimization
POM is a comprehensive package for steadystate, transient and smallsignal analysis of the electric power system networks in planning, operations and realtime environments.
POM Suite consists of the main application, Physical and Operational Margins (POM), and a number of addon modules.
The addon modules are:

POMSA  Small Signal Analysis
Steadystate analysis
is based on fast AC analysis, which uses the full NewtonRaphson method to solve a nonlinear power flow model. The normal conditions (N0) model and each (Nk) contingency are applied while simultaneously monitoring multiple constraints: voltage stability, thermal overload, voltage deviation, and voltage limit violations. These constraints can be monitored over the entire network or any portion thereof. Some of the application features are:
 Load flow analysis
 Voltage stability analysis
 AC transfer simulation
 Massive AC contingency analysis (N1, N11, N2 analysis): analysis of Planning Events
 Prediction and prevention of cascading outages: analysis of Extreme Events
 Transmission system optimization: determining optimal remedial actions
 Computing secure operating region: a boundarybased solution
 Ranking future transmission expansion projects
Transient stability analysis
allows the user to compute transient stability limits during massive contingency analysis and includes:
 Traditional timedomain simulation
 Short circuit computation
 Fast Fault Screening of threephase and unbalanced faults
Real Time
For the realtime environments, POM Suite offers the following capabilities:
 CIMCompatible
 Utilizes PMU data to predict system instability
Smart Grid Applications
POM Suite offers a smart solution for the transmission system, which includes:
 Utilizing PMU data to predict system instability and alarm the operator
 Improving the efficiency of the power grid by minimizing the system losses
 Improving reliability of transmission grid to facilitate integration of renewable energy
Applications for Planning
 Automating and significantly expediting the studies to comply with NERC TPL Standards:
 Massive N11, N2 AC contingency analysis
 Automatic remedial actions
 Database output
 Fast transient stability analysis with FFS
 Automated AC transfer/load pocket and contingency analyses with visualization, which performs the following analysis within one simulation run:
 Determines available transfer capability for each contingency
 Determines interface flows
 Automatically builds PVcurves
 Reliability Analysis  Computing reliability indices
 Phaseshifter settings optimization to relieve postcontingency violations
Applications for Operations
 N1, N2 studies for outage coordination
 Voltage stability – fast PV curve analysis
 Power transfer analysis with visualization tool implemented for N1, N2, …, NK
 Emergency mitigation measure process – load shedding
RealTime Analysis Applications
 Massive N1, N11, N2 AC contingency analysis
 Utilizing PMU data to continuously monitor the system and alarm the operator of impending crisis
Application Capabilities
 Extremely fast. Applies 50,000 contingencies per hour, or under 0.1 sec per contingency for a 50,000bus case during AC contingency analysis;
 Alleviates thermal, voltage and voltage stability violations during massive AC contingency analysis in approximately 10 sec for one contingency for a 50,000bus case.
 Performs a one second timedomain simulation in approx. 6 seconds for a 50,000bus case and 17000 dynamic models
 Handling of very large contingency lists  millions of contingencies per run during AC contingency analysis
 Fast and accurate computation of the operating limits and their visualization, and performing corrective actions to mitigate the exceeding operating limits
 Assessment of the cascading outages
 Alleviating voltage instability and identifying it’s causes; increasing voltage stability margins
 Automatic N11 contingency analysis to comply with the upcoming NERC standards
 Providing a boundarybased solution
 Performing Fast Fault Screening to enable comprehensive transient stability analysis and brining transient stability analysis into the realtime environment
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