Knowledge Base

Can I solve a Real-Time power flow in Retriever?

Yes.  The data that is imported from the real-time sources can be substituted for the underlying system data to solve a real-time power flow in Retriever, provided that: a complete system model with all required object fields necessary to run a power flow solution is provided (see case validation), and the underlying model fields (when […]

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July 5, 2012

I am getting $5000 / MW-hr LMP’s. Can that be correct?

If a constraint cannot be enforced due to insufficient controls, the slack variable associated with enforcing that constraint cannotbe removed from the LP basis.  Marginal cost depends on the arbitrary cost of the slack variable.  This value defaults to  $5000 per MW-hr in order to enforce the equality constraint that a control area’s generation should […]

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July 5, 2012

Can I have negative marginal prices? What do they mean?

Yes, in highly congested systems you can in fact see negative LMP’s at a bus (or buses). This is always coupled with high LMP’s at other buses.  A negative LMP means that serving an additional MW of load at the negative LMP bus will reduce the operating cost. More flow to the load creates a […]

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July 5, 2012

How can I simulate varying quantities? Can I store the results?

You can simulate varying quantities (and store the results) by using the Time Step Simulation (TSS) tool.  TSS allows you to specify operating conditions and obtain power flow solutions for a set of points in time.  It provides the tools needed to analyze the operation of a power system hour by hour. TSS is included in […]

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July 5, 2012

What power flow algorithm does PowerWorld use?

Simulator uses a full Newton-Raphson algorithm, with non-divergence control. Simulator can solve power systems with up to 100,000 buses, and an almost unlimited number of lines. Simulator has been used to solve FERC 715 cases for all of the NERC (North American Electric Reliability Council) regions. The largest cases we’ve seen so far have been […]

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July 5, 2012

How do I filter a case information display so that it only shows the information I need?

You can filter case information displays by Area/Zone/Owner and/or by applying a custom filter (called Advanced Filtering). Area/Zone/Owner Filters To hide all records assigned to a particular area, zone, or owner: Click the Area/Zone/Owner filters button   on the case information toolbar or select Case Information >> Area/Zone/Owner Filters from the main menu. The resulting dialog has three […]

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July 3, 2012

When I pasted in (or imported from an aux file) information for a generator record, the AGC field changed to “NO”. Why is this occurring and how do I correct it?

This is an option on the Environment tab of the Solution/Environment Options dialog. If a value is pasted in for Gen MW, then Simulator assumes that you desire to have Gen MW specified.  As a result, Simulator automatically sets the AGC field for that machine to “NO.”  Additionally, when importing data either from an aux file, or […]

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July 3, 2012

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