Knowledge Base

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

Using Contingency Categories for monitoring of different voltage deviation limits for different contingencies

Previous knowledge base articles have covered both Monitoring voltages for Post Contingency Voltage Drop Criteria Monitoring which covered how to monitor all buses in the system for a particular voltage drop. How to specify different Voltage Deviation Limits for different buses in Contingency Analysis which did a similar thing but allowed the criteria to be […]

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September 30, 2015

GIC and Geographic Data View

Simulator’s Geographic Data View feature is uniquely suited for visualizing geomagnetically induced current (GIC) flows over a wide area. In the graphic below, each substation is depicted by a colored circle. The size of the circle is proportional to the GIC flowing through the neutral, while the color indicated whether GIC is flowing into or […]

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August 18, 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

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

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: GitHub Repository [recommended to Fork and continue your custom development]  Has 64 bit build configured for C++ projects in Visual Studio 2019 Sample code projects for Exciter, Governor, Machine, Stabilizer, and Load  […]

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June 16, 2014

Registering SimAuto

SimAuto must be registered in the Windows Registry before it can be referenced from external programming platforms. This normally happens automatically when Simulator is installed, but may need to be performed again if there is a hardware change or if you are working with multiple versions of Simulator. (Only one version of SimAuto may be […]

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March 20, 2014

Physical Security Assessment

On March 7, 2014, FERC issued an order directing NERC “to submit for approval one or more Reliability Standards that will require certain registered entities to take steps or demonstrate that they have taken steps to address physical security risks and vulnerabilities related to the reliable operation of the Bulk-Power System.” PowerWorld Simulator can easily […]

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March 12, 2014

D-FACTS Quick-Start Tutorial

Distributed Flexible AC Transmission System (D-FACTS) devices or “smart wires” change the effective line impedance of the transmission line on which they are installed.  The Knowledge Base Article is a quick-start tutorial that introduces D-FACTS devices and how to use them in PowerWorld Simulator.  This is a short hands-on training session with slides and sample cases. […]

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January 15, 2014