| 摘要 |
A controllable broad-spectrum filter is developed. This filter is to be connected in series ahead of the load which generates harmonics in 3-phse 3-wire systems. This filter basically consists of 3 fixed elements, i.e. a series reactor, a shunt reactor in series with a capacitor. It can function to filter out 5th harmonic current completely and other harmonic components at high percentages say, typically close to 70%. Thus the portions of various harmonics flowing toward the electrical power source are within the acceptable limits. By changing these two reactors and capacitor, a desirable and controllable filtering performance can be achieved. A satisfactory performance of the filter and the electrical system can be expected by use of this invented filter with only 3 major elements. A voltage compensator, a reactor of negative value" is recommended to compensate the harmonic voltage distortion across the series reactor (or the filter), if necessary.
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