Which electrical equipment can reduce the %VUF value to no more than 2%?
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Good evening, I have some questions to ask. This circuit is three-phase circuit with Va=220, Vb=180, Vc=210 and have sliding window with Fourier Analysis for harmonic mitigate in the system.First I decide to create 25 order harmonics. The harmonics start at the 2nd order and drop down to get %THD at 5%. Then create a voltage imbalance by using a switch control , set time 0.3 to 0.5 second and finally I need to mitigate harmonic to become sin wave form. The value of %VUF(Voltage Unbalance Factor) 3-phase before mitigate is 7.5%. What equipment must be used and how should it be connected to mitigate %VUF to not exceed 2% according to international EN50160 standards?




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Shivam Gothi
2024 年 11 月 8 日
As per my understanding, you are looking for a power system device that improves VUF (Voltage Unbalance Factor).
There is no such “device” present to achieve the above objective, but it can be done by using a properly designed DVR (Dynamic Voltage Regulator). It is a controlled voltage source inserted in between the network and the load through a transformer injecting voltage into the network to correct any unbalance in the line. It is a quite complex system consisting of transformers, DC link, controllers and IGBT switches.
Refer to the below cited IEEE conference paper. It focuses on mitigation of Sag/Swell by Dynamic Voltage Restorer using SPWM technique. The authors have also demonstrated it using Simulink model.
“P. B. Shendge and S. H. Pawar, "Simulink model for mitigation of Sag/Swell by Dynamic Voltage Restorer using SPWM technique," 2017 International Conference on Intelligent Sustainable Systems (ICISS), Palladam, India, 2017, pp. 747-750, doi: 10.1109/ISS1.2017.8389274”
Additionally, you can also refer to the below file exchanges that attempts to implement DVR.
I am suggesting one of the possible configurations of DVR that you can use for your attached Simulink model in the below attached screenshot.

Note: The gate pulse signal “g1” will come from a properly designed control system. Refer to the above cited IEEE paper to design the required control system.
I hope you find the information useful!
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