Stability of dynamic simulation for the BESS
Hi, I am modeling an BESS and with one load and one normal generator, using REGCA1 and REECCU model, but after a short disturbance, the system frequency seems not going back to 60Hz, (the non disturbance test will get a flat result), in the output bar there isn't any specific error message, is there any document to check or suggesting in this kind of situation?
Or trying to adjust the parameter according to the transfer function in "MODELS" and the parameter range according to "WECC Type 4 Wind Turbine Generator Model – Phase II" is the right move?
Any suggestion will be much appreciate!
The dynamic parameter is as below:
1,'GENROU',1 6.00 0.05 0.535 0.05 3.33 0.67 1.72 1.66 0.23 0.37 0.21 0.10 1.01 1.02 /
1 'IEEET1' ,1 0.0000 20.000 0.20000 8.535732 -8.535732 1.0000 0.31400 0.63000E-01 0.35000 0.0000 2.8000 0.30338 3.7300 1.2884 /
// governor
1, 'IEESGO', 1, 25.0, 0,1.0,1.0,12.5, 0, 5.0,3.0,0.5, 1.0, 0,/
2,'USRMDL',1,'REGCAU1',101,1,1,14,3,4, 1, 0.02,10.0,0.9,0.5,1.22, 1.2,0.8,0.4,-1.3,0.02,0.7,9999.0,-9999.0,1.0, / Generic RE Converter model
2,'USRMDL',1,'REECCU1',102,0,5,45,7,6, 0,0,1,0,0, -99.0,99.0,0.0,-0.05,0.05,0.0,1.05,-1.05,0.0,0.05, 0.436,-0.436,1.1,0.9,0.0,0.1,0.0,40.0, 0.02,99.0,-99.0,1.0,0.0,1.82, 0.02,0.0,0.0,0.0,0.0,0.0, 0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0, 100.0,1.0,1.0,0.0, /
Electrical Control Model for Utility Scale Battery Energy Storage
Update:
Actually, my goal is to introduce a signal through BESS, and see how the system works, so at first I try to introduce a simple signal like step function, but the system frequency didn't recover to 60Hz as I thought.
So I also tried to do the dynamic simulation with a bus fault at the GENROU side for 0.5 sec then clear the fault, but the system frequency didn't recover also, so I thought the system might be unstable.
Thanks for your reply! really helps me to understand the theory behind.
And another question is, if the frequency reach a stabilise on a new level after primary frequency control, in order to bring the frequency back to 60Hz I need to apply the secondary frequency control by the model like LCFB1 model right?
Link for the figure (google drive):
https://drive.google.com/drive/folders/1lsYtNwQqcZ_bhVABBkAVdDmdp7DIPJjF?usp=sharing (https://drive.google.com/drive/folder...)
What is the disturbance?
Did you simulate long enough to get a new steady state after the short circuit?
In the test with bus fault, the bus tripped at t=2 and cleared fault at t=2.5, run the dyn simulation till t=200s. The link of figure of the test is also posted above, if you are willing to take a look. Another wierd thing is, the active power of the BESS bus will decrease to zero at around t=142s
The BESS goes out of charging at t=142 s! It is stated 100 s battery discharge time. I guess Mbase for BESS is 100 MVA.--> 70 MW output will discharge the battery in 100 / 0.7 = 143 s. Better to plot speed for machine (bus 1)
See my updated answer!