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 […]
Tags: How-to,Script,SimAuto,Simulator
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 […]
Tags: Simulator,Technical Papers,Transient Stability
January 8, 2016
Derivation of the GENTPJ/GENTPF model from the GENROU/GENSAL
Relationship of GENROU, GENSAL, GENTPF, GENTPJ.pdf A set of presentation slides on this topic is also available at this link: Slides on GENROU-GENSAL-GENTPF-GENTPJ_Slides.pdf A fundamental derivation of a GENROU and GENSAL models can found in Chapter 3 of the book Power System Dynamics and Stability by Peter Sauer and M.A. Pai from 1998. This derivation […]
Tags: Simulator,Technical Papers,Transient Stability
October 22, 2015
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 […]
Tags: Simulator,Transient Stability
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 […]
Tags: FAQ,How-to,Simulator,Tutorial
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 […]
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 […]
Tags: Presentation,Simulator,Tutorial
June 2, 2015
Transient stability voltage collapse: See it with large plots and Min/Max result tracking
We had a rather strange support question from a customer running a transient stability run with a three-phase fault that was on for 2 seconds on a 230 kV bus (they were studying delayed clearing of a fault with about a dozen switching actions occurring which eventually cleared the fault after 2 seconds). The network boundary […]
Tags: FAQ,Simulator,Tip,Transient Stability
April 3, 2015
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 […]
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 […]
March 2, 2015