The fixed-time step method is often used to solve the transient electric field problem of the converter transformer under polarity reversal voltage,which often chooses smaller steps in order to ensure accuracy and causes large amount of calculation.In order to effectively reduce the computational cost,a variable step-size explicit Runge-Kutta method decided by the local truncation error at each time step is proposed to analyze the transient electric field under polarity reversal voltage.With the proposed method,a typical model of the converter transformer valve winding is analyzed.The results show that the proposed algorithm is able to effectively reduce the computational cost and can be used to analyze the transient electric field of the converter transformer under polarity reversal voltage.
converter transformerpolarity reversaltransient electric fieldRunge-Kutta algorithmvariable time stepsize
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