Power conversion controller

A power conversion controller that controls a power converter configured to convert an AC power inputted from an overhead line and to consume an active power and a reactive power, the power conversion controller comprising:

• a power factor setter configured to set a power factor based on a detection value of an overhead line voltage;
• and
• a calculator configured to calculate a reactive current command value for causing the power converter to consume the reactive power by multiplying an active current command value for causing the power converter to consume the active power by a tangent of a power factor angle of the power factor,
• the power factor setter being configured:
• if the detection value is within a reference range set in advance, to set a reference value set in advance as the power factor;
• if the detection value is below the reference range, to set a value smaller than the reference value as the power factor;
• and
• if the detection value is beyond the reference range, to set a value larger than the reference value as the power factor,
• wherein the power factor setter comprises:
• a preprocessor configured to calculate a voltage difference by subtracting the detection value from a voltage command value obtained by a first-order lag control of the detection value;
• and
• a postprocessor configured:
• if the voltage difference is zero, to set the reference value as the power factor:
• if the voltage difference is positive, to set, as the power factor, a value obtained by subtracting a first adjustment value proportional to an absolute value of the voltage difference from the reference value;
• and
• if the voltage difference is negative, to set, as the power factor, a value obtained by adding a second adjustment value proportional to an absolute value of the voltage difference to the reference value.