Design and construction of a device to stabilise ac mains supply?
Answer:
You are asking about a very general voltage regulator device.
To design something that stabilizes the mains supply, it is necessary to develop an appropriate set of specifications.
What is the required real power (kW) rating?
What is the required apparent power (kVA) rating?
What is the expected maximum range of input voltage?
What is the required range of output (controlled) voltage?
How quickly does the regulator need to respond to input voltage changes?
And many other key characteristics...
Normally, at the voltage range mentioned, we do not apply active regulating devices for multi-family residential systems. Instead, we design the system (components, wiring, etc.) to limit voltage fluctuation within the range allowed by the accepted standards. If you have just a small load, such as a computer, then a UPS would be appropriate.
Usually, voltage regulation is performed by the utility, at the medium or high voltage level, with adjustments of generator output, capacitor banks, transformer tap changers, etc.
In special cases, large power electronic devices are also used to regulate voltage at the utility level.
Please consider making clarifications to the original question. Then a more specific answer can be provided.
Cheers,
Steve
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