Research on Current Sharing Measurement Method for High Power Thyristor Rectifiers
With the development of power electronics technology,the single unit capacity of high-power thyristor rectifier power supply is increasing,with more and more number of parallel branch thyristors in its bridge arms.The de-mand for the current sharing coefficient of the bridge arm parallel branch is becoming higher and higher.Several methods for measuring the current sharing of traditional thyristor rectifiers are introduced,compared and analyzed.And a new method for measuring the current sharing of bridge arms using a Roche coil and a matching integrator is proposed.The Roche coil not only has a simple structure,which is easy to wind,lightweight and easy to install,but also has a low price,and can achieve electrical isolation from the main circuit.The method has been successfully applied in the field of nuclear fusion,and the measurement accuracy is controlled within 1%.
thyristor rectifiercurrent balance coefficientRoche coi
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