I wish to extract the positive and negative sequence of grid voltages to analyse unbalance faults.
Can anyone give me a sample Simulink file which guides me how this extraction can be done?
kindly help.
You must insert in your 3-phase circuit:
1) from Simscape/SimPowerSystems/Measurement -> Three-Phase V-I Measurement;
2) from Extra Library/Measurement -> 3-Phase Sequence Analyzer
and
3) from Sinks ->Display
as in attached drawing.
Dear Prof. Amit is there any mathematical method to get the positive and negative components as instantaneous waveform va+(t), vb+(t), vc+(t) and va-(t), vb-(t), vc-(t). the method mentioned by prof. Marian Costea give the amplitude and phase of each vector
Mahmoud Fawzi Dear sir Matlab do not have its inbuilt block to extract the sequence voltages from individual phases. Hence I feel the extraction of individual phase voltages must be done 1st, then the conventional formula must be applied by incorporating the 'alpha' operator and associated formulas.
va+(t)= 1/3[va(t)+alpha*vb(t)+alpha^2*vc(t)] etc.
thank you prof. Amit Kumar Roy for your help
i know the formula but it gives the output in phasor form
i am searching for a formula to give the instantaneous values
i found a method as shown in the fig. but there is no information or reference about it
do you see this before
Bak, Yeongsu, June-Seok Lee, and Kyo-Beum Lee. "Balanced Current Control Strategy for Current Source Rectifier Stage of Indirect Matrix Converter under Unbalanced Grid Voltage Conditions." Energies 10.1 (2016): 27.
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