Power system frequency stability
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- čas přidán 28. 07. 2024
- To use the background simulator yourself go to www.ecsp.ch. A good tutorial about how to keep balance between power supply and load in a power grid. Watch more videos: / @georgschett801
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Thanks so much! There's very little information about these topics on youtube.
Interesting angle presented here; if I get it correctly, renewable generating capacity becomes a load, same as the slip angle shifts a motor into a generator.
Thank you Georg!
More generic: If the angle lags it is a motor consuming real power (or a resistor), if it leads it is a generator producing real power.
Hi Georg I tried running the simulation via the link in the description however when i hit the run button I don't see any sinusoids on my screen any idea why is it happening ?
Thanks for your feedback. Do you try to run the software based on a touch screen device? This would not work, a corresponding warning should be visible. I did not hear of issues with firefox, google Chrome, the new edge and Opera. Not tested is safari. Let me know, thanks again.
Thank you for the pedagogical video. I have a question though. The turbines
in hydro/nuclear and gas power generation can be frequency regulated to the wanted frequency. The frequéncy in wind turbine is dependent on the wind velocity, it goes up and down. How is it possible then to utilise wind turbines? I mean may wind turbines be contraproductive because they perturbate the stability of the power net? Can you use wind power to a certain amount and coexist with conventional power? Is it possible to frequency regulate wind power? Do you need to store the energy from wind power to able to regulate it? Thank you
Thanks for your kind feedback. You got a very good question. Wind turbines have normally no synchronous generators. They have either asynchronous generators, which can deliver power into a grid at a rotation speed above the grid frequency. Some also have various degrees of power electronics interfaces which convert the power from any frequency (up to DC) to grid frequency. If you deliver power via asynchronous generators, there must be a strong enough AC to feed in otherwise it won't work. There is no need for storage as long as the grid needs the wind power. If however there is not enough load, the frequency of the grid will increase. If so, the wind (or solar...) generation has to be curtailed or the energy has to be stored. Hope this answers your questions.
@@georgschett801 Oh thanks again for your answers. If I got i right you have to convert the Wind turbine current to D.C current, and then back to A.C current to bie able to regulate it? If so I gues that it causes extra costs and energy losses? You know, I live in Sweden and Sweden faces skyrocketing electricity prices because a huge amount of the nuclear power in southern Sweden has been decomisioned by political decisions (Ukraine war does of course also affect the prices). The Swedish goverment wants to increace ocean based wind Turbine power in the baltic ocean with 500 TWh. Sweden has Today a total consumption of 150 TWh (think the idea is to partly export the energy to Europe and partly use it for the growing electricity demand in Sweden). Do you consider those enormous plans for Wind Turbine in Sweden (and Germany) to be an efficient way to solve the electricity price boom or is it more like a political Jippo. Sorry if I trouble you with my long questions.
@@johanlilliestrale6333 Not exactly right. Many wind turbines are operated with asynchronous generators. There is no need for major power electronics converters but they normally have a gear box. They are as far as I know however not so efficient. The larger turbines have power electronics converters, some of them have a DC interface, some of them have no gear box. There are many different technologies well described in literature. Wind energy as such is increasingly competitive and together with solar it is the right answer to increasing power demand and to the substitution of hydrocarbons. Off-shore wind parks are much more efficient than on shore ones. The actual price boom however is not driven by renewables but by the so called merit order pricing scheme. This pricing scheme is also well explained on internet. This pricing scheme was perfect in times where gas was kind of normal. Today however the high gas prices disturb the whole story and at the same time there are issues with the nuclear in France and a lack of water storage in Europe. So Europe has all interests to rapidly increase renewable, manly solar, wind and hydro.
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It's a very interesting simulation. I'm interested in the correlation between power load/generation to frequency. I still don't understand how a sudden change in load/generation would affect the frequency by formula. Can you nudge me in the right direction? =)
Let's compare it to a car: The frequency would be the speed of the car. The control of the speed of the car would be set at 50 km/h (i.e. 50 Hz). If the car would now suddenly have to climb a slope (i.e. change of load, right?) the car would slow down, right? This same thing happens when you increase the load in the power system, the frequency drops. The automation system would notice the change and counteract with increasing the fuel injection in order to increase the torque of the motor (i.e. of the generator) in order to keep the frequency / speed constant at 50 Hz (i.e.: 50 km/h.). The opposite would happen if the car would suddenly drive down a hill, the car would accelerate and thus the motor would reduce the torque.
I have a question: why the high penetration of RES of the last decade has reduced the primary frequency reserve? Is this correlated with the inertia of the system? Thank you in advance.
There is a good paper available on internet: www.nrel.gov/docs/fy11osti/51978.pdf. As far as I am aware of, the answer to your question is YES. The primary frequency reserve is very much depending on the available system inertia, which decreases with increasing variable (intermittent) generation. How much is still subject to research as well as possible remedy.
Thank you very much for you answer I will read the paper you suggested to me!
What is the simulation software used
www.ecsp.ch