As for the special condition of super capacitor bank in the variable pitch system of wind turbine

a kind of accurate an online detection method for the capacitance of super capacitor is propo-sed. The infl- uence of simulated measurement accuracy on capacitance is overcome efficiently by way of adding temperature compensation coefficient of capacitance and charging / discharging resistance and the capacitance detection accuracy of the super capacitor is improved. It is shown by the experiment that the error of the detection mode by the proposed method is 0. 5 % without adding hardware equip-ment is convenient in operation and reduces the difficulty of the wind turbine in operation and maintenance.