Filter reactors are used in two aspects. One is to reduce the amplitude of the ripple on the DC current in the rectifier circuit; A voltage or current used to eliminate a certain harmonic of a power circuit. It is tuned to a certain resonant frequency to absorb and shunt the harmonic current of the corresponding frequency in the grid. The reactance rate is 1 percent , 5.67 percent , 6 percent , 12 percent , 13 percent , etc., which can eliminate the 3rd, 5th, 7th, 11th, 13th and higher harmonics. After the filter reactor is connected with the capacitor in series, it can not only effectively absorb the harmonics of the power grid, but also improve the power factor of the system, which plays a great role in the safe operation of the system and ensures the quality of power supply of the power grid.
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