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openPDC Frequently Asked Questions

Question: I am having trouble building the solution, what I am doing wrong?

Answer: The solutions have the following dependencies: Synchrophasor depends on Historian and Framework. Historian depends on Framework. So, make sure you rebuild all projects in the solutions in this order: Framework, Historian, Synchrophasor.


Synchrophasor Questions

openPDC Questions

Question: When I open the Synchrophasor solution, I get the following message: “The project “…” cannot be opened. The project type is not supported by this installation”. What is this?

Answer: The Synchrophasor solution includes a Silverlight application, as well as a Visual Basic application. This error can be safely ignored if you do not wish to view and/or modify the openPDCManager (based on Silverlight) or the PMU Connection Tester (based on VB.NET). To load the Silverlight application, install the following:

  1. Silverlight3 Tools for Visual Studio 2008 SP1: http://www.microsoft.com/downloads/details.aspx?familyid=9442b0f2-7465-417a-88f3-5e7b5409e9dd&displaylang=en
  2. Silverlight3 Toolkit July 2009: http://silverlight.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=24246

To load the Visual Basic application, you will need to reinstall Visual Studio, making sure to include “Visual Basic” as an installed programming language.

Question: After I have rebuilt the Framework solution while the Synchrophasor solution is open, then try to rebuild Synchrophasor, the PMU Connection Tester shows a million errors. What is that?

Answer: This is some kind of Visual Basic project bug related to dynamically updating its references. Right-click on the PMU Connection tester, and select “Unload Project”. If you are not dealing with the connection tester, you can leave it unloaded; otherwise, right-click the project again, and select “Reload Project” and the errors will be gone.

Question: I'd like to create my own custom adapter. What are the various types of adapters used for?

Answer: You can do anything you like with any adapter. Basically all adapters are similar in nature but perform the following specific abstract tasks.

InputAdapters: Typically “maps” measurements from a data source (i.e., assigns a timestamp and an ID to measured values parsed from a stream of data), new measurements are presented to openPDC by calling “void OnNewMeasurements(ICollection<IMeasurement> measurements)” method. Interface: IInputAdapter, base class: InputAdapterBase

ActionAdapters: Typically filters and sorts measurements by time allowing adapter to take action on a synchronized set of data provided in the “abstract void PublishFrame(IFrame frame, int index)” method which adapter overrides (note that frame contains a collection of measurements all collected into the same time-indexed frame bucket). If the action causes the creation of new measurements (e.g., phase angle and magnitude used to calculate power), new measurements are presented to openPDC by calling “void OnNewMeasurements(ICollection<IMeasurement> measurements)” method. Interface: IActionAdapter, base class: ActionAdapterBase

OutputAdapters: Typically queues all measurements (no sorting) for processing. Queued measurements are presented to the adapter for processing in the “void ProcessMeasurements(IMeasurement[] measurements)” method – if measurements continue to build up in memory and are not processed in a timely manner they will be removed from the queue as protective measure to prevent catastrophic out-of-memory failures. Since output adapters are used to archive data this is often the slowest part in the system (disks tend to be a bottleneck), outputs can optionally be set to filter based on a measurement’s defined “Source” property – this allows multiple outputs to be targeted to several different distributed outputs which allows large systems to stay ahead of the incoming data stream. Interface: IOutputAdapter, base class: OutputAdapterBase

You can read more about creating custom adapters on the how-to page for custom adapters.


Historian Questions

Question: Is the binary format of the history file documented?

Answer: Yes. Click here for a document that describes the high level format. Also, the binary format for all the data stored in the archive is documented in the individual class files in TVA.Historian class library. A good place to start would be the class files under TVA.Historian.Files namespace of TVA.Historian class library project.

Last edited Jun 25, 2012 at 8:27 PM by alexfoglia, version 4

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