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Monthly Archives: October 2009
by R. Austria A power flow that doesn’t converge is annoying, to say the least. For one, any information you try to use from a non-convergent solution is moot and questionable (recall that a power flow is a solution of a set of equations … Continue reading
Wind Farm by Pterra Consulting Whereas, power plants using renewable energy sources were not too long ago considered exotic, today they are the new face of energy — the wind mill replacing the smokestack as the symbol of electric … Continue reading
by R. Austria Conventional wisdom says that the more motors connected to a feeder, the faster voltage will collapse when there is a reactive deficiency. This is true to the extent that voltages do drop faster, but the voltage may … Continue reading
Here are the top 3 reasons a transmission analyst may need to avoid modeling each turbine and each cable in the wind farm for the interconnection study Continue reading
Following is the proposed course schedule for Spring 2010. All courses are to be held at the Pterra Training Facility in Albany, New York. April 20-22, 2010 – Voltage Stability Analysis and Applications Course. May 11-13, 2010 – Linear Power Flow Analysis and Applications Course. June 8-10, 2010 – Power Flow Analysis and Applications Course. June 15-17, 2010 – Applications in Wind Power Interconnection Course. For early birds, all the above courses are being offered at 2005 prices ($295 per seat). So sign up now at the Cvent registration site!
Held in Albany, NY, Oct 6-8, 2009
We had a good, quiet course. Very conscientious students. Went past the scheduled time each day just to complete the exercises. One-on-one time was also very fruitful, allowing the instructors to directly show applications on the participants own system.
The average course rating by the participants was 5.0 on a scale of 5. As we said, it was a quiet group, and we have only one participant comment to report:
It was awesome!
Reasons for divergence, and our explanations.
The power system is going to “blow-up.” — the term “blow-up” just applies to the numerical solution.
There is something wrong with the solution algorithm. — not the formulation but perhaps the implementation into computer code.
There is something wrong with the data. — yes, of course. The old concept – garbage in, garbage out.
There is something wrong with my computer. — do you have a 386?
The solution hit a bad iteration. — like hitting a crack in the pavement that breaks your differential and off goes the wheel! Not a bad analogy except that its much easier to do the bad iteration than it is to break the car.
We hit a bifurcation. — yes, after we exclude all the other simple reasons.
We hit a saddle-node bifurcation. — even better.
We hit the wall. — like, “this software is driving me crazy, I want to hit my head against the wall?” Continue reading
by Pterra Consulting Bread and Butter The power flow is the bread-and-butter tool of power system analysts of large and small-scale transmission systems. It is used in the day-to-day operations of the grid to determine potential congestion, transmission loading relief … Continue reading
Held in Albany, NY, Sept 29-Oct 1, 2009
We have to look back on how many times this course has been held, but this remains a popular topic. This time around the attendees came from the New York ISO, ISO New England and the Midwest ISO. (ISO – independent system operator, for our overseas friends).
The average course rating by the participants was 5.0 on a scale of 5. Some of the participant comments:
•Excellent instructors. Responsive to questions, shared experience and knowledge and examples.
•Very logical structure of course progression and presentation – easy to follow and learn
•Being quite new, I appreciate the “hand-holding” during exercises and discussions.
•I learned a lot. Small class size was helpful.
•Knowledgeable and friendly staff!
•Excellent experience – thank you!