Knowledge Base

GIC and Substation Coordinates for Line Taps

To properly perform geomagnetic induced current (GIC) analysis, substation geographic coordinates (longitude, latitude) must be provided for all substations that contain terminals of transmission lines for which a GIC-induced equivalent DC voltage is applied. Generally this includes all lines greater than the minimum length and minimum voltage specified on the GIC Analysis Form. The need for coordinates […]

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March 26, 2015

Assigning Costs to Control Adjustments in OPF

Download the example files. Simulator’s Optimal Power Flow (OPF) has 2 options for objective functions: Minimum Cost or Minimum Control Change. Generally Minimum Cost is used where generator bids or costs and load benefits are known. Minimum Control Change is used where it is desirable to relieve transmission overloads with minimum deviation from the present […]

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March 2, 2015

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

Optimal Power Flow with Load Dispatch

Download the example files. These examples show how Simulator’s Optimal Power Flow (OPF) may be used with dispatchable loads to relive transmission overloading. First, the OPF may be used with the minimum control change objective function. Here, the “cost” of changing a control (generator or load output) is the same for each MW of change […]

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January 5, 2015

How to specify different Voltage Deviation Limits for different buses in Contingency Analysis

PowerWorld Simulator allows you to monitor for violations based on the change in a value relative to the reference state (base case).  This was already covered in the knowledge base article at WECC Post Contingency Voltage Drop Criteria Monitoring.  This works well if you have the same percentage drop violation for all buses in your system. […]

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January 2, 2015

Interactive Tutorial

This tutorial features a fictitious power system the size of a medium-sized city. The simulations explore several facets of power system planning and operations, including: addition or removal of transmission facilities addition, de-rating, or removal of generating resources demand response and use of customer-owned generation, such as rooftop solar physical or cyber attack on a […]

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December 3, 2014

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

Example of Geomagnetic Induced Current (GIC) Calculations

Appendix II of the Application Guide: Computing Geomagnetically-Induced Current in the Bulk-Power System published by the North American Electric Reliability Corporation shows calculations of GIC currents and related quantities for a hypothetical power system with 6 buses and 3 substations. This system is available here for use in PowerWorld Simulator. These may be examined in the free […]

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July 18, 2014

User Defined Model Documentation

Sample Files and Code For the Basic User: Sample DLLs and Test Case for Exciter, Governor, Machine, and Stabilizer For the Advanced Developer: Sample code projects for Exciter, Governor, Machine, Stabilizer, and Load Guides Quick Start for User Defined Models User Defined Model Tutorial Developers Guide for User Defined Models

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June 16, 2014

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