I need to use a module to stabilize the three phase voltage on three phase three wire (delta) distribution line of an isolated micro grid system. To overcome any voltage sag or swell on the three phase three wire lines. Which is the best solution to be used ? I want device with low chance of failure for long time. Options like DVR or UPQC have lot of components so chance of failure becomes high requiring maintenance. I need to use it at a remote location where access is difficult from maintenance angle. So, what is opinion about using thyristor based regulator for each line? The power is around 15kW to be handled. Better options or any thoughts on the topic would be appreciated.
Dear Mr. Ahmed,
A motor-generator system with output voltage regulation would have been nice rugged solution, but it belongs to history. Static or electronic stabilizers are most popular nowadays. You can find electronic stabilizers (DVS) from Ortea, Salicru etc. Thyristor stabilizer with W3C, P3C or similar topology is possible too, however it may only decrease the voltage. You would need transformer anyway. Thyristor also causes low frequency voltage disturbances on switching. Those are hard to filter out in case you need pure sinusoidal voltage. I would use IGBT frequency converter with sinusoidal filter at the output and 3 phase transformer(s) to fit the voltage levels and earthing systems. Frequency converters usually have built in stabilization systems. If this is not good enough, you may measure and control the input and output voltages with an external controller. We have built such stabilizers. See https://etexm.de/variable-sinusformige-spannungsquelle/
If you send me more detailed technical specification, we may offer you such a stabilizers.
Best regards
Jüri Joller
I believe that a low cost and maintenance solution for voltage stabilization in these types of isolated networks is the optimal placement of the self-adjusting capacitor. indeed the capacitor despite which can generate oscillations in the event of a very dense network remains the solution adopted in many countries the use of DSTATCOM, which is less sophisticated in maintenance, can also help improve the technical performance of an isolated network. however it is necessary to optimize their position in order to guarantee their effectiveness in regulating the problem of tension in a network.
Voltage regulation could be controlled by not allowing neutral point to shift by monitoring the load balance, as poor regulation would be of heavily loaded phase. Could refer my paper Automatic load shedding controller using microprocessor…
D. Ahmed It is almost impossible to get zero voltage sags or swells at load-end, when considering the long distance three phase transmission lines.
but you can minimize voltage sags or swells by minimizing active and reactive equivalent impedance of the power souce (including power transmision lines)
methods of low cost and high reliabilty could be :
（1）increase power source capacity
(2) minimize transmision lines impedance
（3）sensing load-end voltage and current （amplitude and phase）, and incorporate transmision lines impedance into voltage/current close loop of power source
（4）local reactive power compensating by passive component
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