Hi
Please can somebody tell me the easiest way to control the voltage output of induction generator.
The generator is three phase 11 kW, excitet by capacitor bank of 240 µF; as a prime mover a tractor of 30 HP has been used. The speed of the generator can manually be adjusted, but when done, then the speed is more or less constant.
The problem is that the output voltage depends greatly on the induction generator speed and load. For a given capacitor value, self-excitation can only be achieved and maintained under certain load and speed combinations. The machine demagnetizes and stops generating either when the speed falls bellow, or the load rises beyond certain values.
So plese can somebody help me solve this problem. I would like to build voltage regulator for IG that maintains stabile voltage regardless of load and speed value.
I have looked for this topic on the internet, but i found only very complicated solutions which included voltage source inverters, and digital controllers based on a Pentium PC. I dont have anything against voltage source inverters or something similar, but hooking up a PC to control the voltage output is a bit to much.
Any ideas would be greatly appreciated; the simpler the better, even if the voltage regulation itself is not 100% accurate, as long as i can avoid demagnetization and regulate the output voltage.
Thanks.