電流形PWM方式の配電用アクティブフィルタの性能改善法

抄録

Active filter (AF) is the apparatus to eliminate harmonic currents in the distribution line by using switching devices. There are two type of AF, the voltage source type and the current source type. The voltage source type is common for realization today. But we have been studying and already reported AF of the current source type for its rapid and precise controllability of output current and little interference between AF and the distribution line.
In this paper, we propose two scheme to improve its performance and to reduce its capacity.
To improve the performance of AF, we changed the PWM carrier from triangular wave to sawtooth wave, but its switching times are same in some range. By using the sawtooth PWM carrier wave of 5kHz (corresponding to triangular wave of 2.5kHz) and the multiple connection of AF, it can eliminate harmonic currents of less than 19-order in distribution line.
To reduce the capacity of AF, we propose AF which eliminates only harmonic currents. By using other apparatus for reactive power compensation, the more economic system can be achieved.
The experimental results of the tested apparatus show that these methods are useful for realization of AF.