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Knowledge Base

Adding Voltage Compensation to a Generator Model

Generator Voltage Compensation The input signal to Exciter models is a voltage signal (often labeled as either Vc or Ec on a block diagram).  In the simplest form this is just the per unit voltage magnitude of the terminal bus of the generator.  However, sometimes instead of using that voltage signal directly, the voltage is compensated by attempting to control […]

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October 19, 2016

EMP Simulation Example

NOTE: This example requires PowerWorld Simulator version 20 beta. Please contact us if you are interested in testing and evaluating this software. PowerWorld is developing the capability to analyze the E3 effects of a high-altitude electromagnetic pulse (HEMP) attack on the power system. Algorithms are based on Oak Ridge National Laboratory research. To perform a sample […]

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June 24, 2016

Complete Case Auxiliary File Export Format Descriptions

PowerWorld’s Auxiliary File Format is very flexible in providing a mechanism for saving model information from PowerWorld Simulator.  It also provides a great way to share information with others.  This flexibility however has some downsides as puts additional burden on the user to know which things to save.  Many tools within PowerWorld Simulator overcome this by including […]

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May 13, 2016

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

Coordinated Initialization of the Load Distribution Equivalent, Load Characteristic, and Load Distributed Generation Models

Generator modeling in transient stability simulation software has been modularized for decades. Generators are modeled using a Machine Model, Exciter, Governor, Stabilizer, etc.  Several new modules for generators have been added in the past few years specifically for wind turbine and renewable energy modeling. Load models however had remained stuck with only 2 models: a load […]

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January 8, 2016

Voltage Compensation Data Input Errors leading to Transient Instability

Voltage Compensation can be modeled in a few different ways in PowerWorld Simulator.  First, there are Rcomp and Xcomp values which can be specified with the various synchronous machine models such as GENROU, GENSAL, GENTPF, and GENTPJ.  In addition, you can add specific other generator models to represent compensation: COMP, CCOMP, COMPCC, CCOMP4, and IEEEVC. Without […]

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October 22, 2015

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

WECC RAS and Contingency Workshop Materials

PowerWorld Corporation staff led a RAS Modeling Workshop at WECC offices on May 27 – 29, 2015 in Salt Lake City.  This workshop consisted generally of the following material. 3 hours of pure presentations 4 hours of basic software training on PowerWorld Simulator 7 hours of hands-on workshop with engineers from throughout WECC sitting down to model […]

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June 2, 2015

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