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Study of controlled switching with preinsertion resistor during energization of AC filters

AC filters plays an important role in DC transmission system, as they can compensate reactive power consumed by the converter station and filter out the harmonic components. To suppress the switching transients during energization of AC filters, controlled switching device and circuit breakers with pre-insertion resistor are adopted commonly. This paper studied the relationship between the switching transients and switching angle and resistor insertion time which affect the closing inrush current directly by theoretical analysis and simulation calculation. Then the optimal controlled switching strategy to minimize the switching transients during energization of different AC filters using controlled switching device with circuit breakers with pre-insertion resistor is presents.