l have a turbine controlled to 270 rpm generator has 8 poles and its RMS output voltage at this speed is 170volts the light bulb is rated at 90 W, 230volts and its allowable voltage ripple is 7%, then add a brige rectifier circuit and need to calculate capacitor value

 

3 phase? 360hz <30% ripple?
Max.

 

3 phase? 360hz <30% ripple?
Max.

single phase, 18Hz and allowed ripple is 7%

 

how do l calculate the capacitor value of a bridge rectifier with being supplied by an Hz,170v rms single phase were the allowable ripple is 7% urgent please help

 

First, you show YOUR best attempt to solve YOUR homework.

Consider such things as how much current the load is drawing and how long the filter capacitor must supply this current while the rectifier is blocked.

 

Are you using ideal components such as ideal diodes?
From the generator speed and number of poles you can determine the AC frequency.
Then you can calculate how much the voltage drops on the capacitor due to the load from the bulb when the diodes stop conducting after each peak of the rectified sine-wave.