Knowledge Base

Earth Resistivity Model for GIC Calculations

PowerWorld Simulator GIC can automatically incorporate scaling factors for geomagnetic latitude and earth resistivity according to NERC TPL-007-2 – Transmission System Planned Performance for Geomagnetic Disturbance Events (October 2017). The earth resistivity models must be loaded from an auxiliary file. Those described in TPL-007-2, Table 3: Geoelectric Field Scaling Factors, are available here (revised January 31, 2018). […]

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January 31, 2018

Play-in time series measurement data with PlayInGen model for Power Plant Model Validation (PPMV)

PlayIn models can be found in the Transient Stability add-on of Simulator. Many dynamic models comprise of differential-algebraic equations that respond to perturbations in a simulation. In contrast, these PlayIn models are used to input time-series data into a transient run at specified time points. In Simulator, a PlayIn Configuration object can be used to store […]

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February 8, 2017

Using Special Variables with Scripts or SimAuto

Some Simulator functions cause special variables to be created for storing results. The multiple element TLR sensitivity is a common example. Special variables are used to hold the sensitivities of flows on those multiple elements with respect to injections at various points. The number of special variables in use depends on the number of branches […]

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February 1, 2016

Transformer GIC Thermal Response

This spreadsheet (revised November 3, 2017) includes sample formulas for calculating transformer winding and metallic parts hot spot temperatures as described in the NERC white papers Transformer Thermal Impact Assessment White Paper and Screening Criterion for Transformer Thermal Impact Assessment. It is provided with the following disclaimers: Input parameters in this spreadsheet are samples provided for illustration […]

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February 9, 2015

Transformer Time-Series for NERC Benchmark GMD Event and Supplemental GMD Event

The following input files may be loaded to automatically simulate the time-series surface electric fields in the  NERC Benchmark Geomagnetic Disturbance Event (May 12, 2016) and Supplemental Event. Benchmark Event (updated November 2, 2017) Supplemental Event (updated June 8, 2018) From PowerWorld Simulator GIC, click the button “Load Time-Varying Input and Calculate Transformer IEffective”.  For each time step, GIC calculations are performed […]

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October 10, 2014

Comparing Contingency Results

The Knowledge Base Article will cover how to take several contingency analysis runs done on the same system topology under different conditions and then build an Microsoft Access database that uses a query to compare the results across different contingency runs. Creating a Test Example of Three Different Contingency Analysis Runs on the same case […]

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November 15, 2013

Case Study in Using Auxiliary File Scripting with Advanced Filters, Custom Floats, and Expressions

This is a case study that demonstrates how to automate the process of replicating the net reactive capability curve from a set of renewable generators behind a small distribution system which is connected to a single utility bus.  This serves as a wonderful example for demonstrating several topics. Use of auxiliary files to automate processes […]

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June 6, 2013

Example SimAuto Files

Right-click on the file links below and select “Save target as…” to save them to your computer. SimAuto version 12 (and later) Microsoft® Visual Basic for Applications Examples Running from Microsoft® Excel: Running from Microsoft® Access: ATC Calculator (includes database, cases, and support files) Multi-period Market Simulation (includes database, cases, and support files; unzip […]

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July 31, 2012

Enabling AGC control of ISO-NE in cases where it spans multiple islands

Auxiliary File: HighgateIsland.aux (Right-click on the above file and select Save Target As to save it to your computer.) In some Eastern Interconnect planning models, the ISO-NE area spans multiple islands that contain multiple areas. Some of its buses, loads, and generators are connected to the rest of the area through the Highgate AC-DC-AC link […]

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June 29, 2012

PTDF and Contingency Analysis of a New Transaction

Auxiliary File: Transaction.aux PowerWorld Case: B7OPF.pwb PowerWorld Oneline: B7OPF.pwd Output Files: PTDF.aux, BeforeTransactionCTGReport.txt, AfterTransactionCTGReport.txt (Right-click on the above files and select Save Target As to save them to your computer.) This script implements a large transaction from the left area to the top area of a seven-bus system and illustrates the effects of the transaction […]

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June 29, 2012

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