| 摘要 |
The proposed filter for higher harmonic components of current in a three-phase electric network contains a three-core magnetic circuit. At each core of the magnetic circuit, 4 ... 6 windings are arranged. Filter has input terminals for connecting the filter to the phase conductors and the neutral conductors of the electric network, output terminals for connecting the phase conductors of the load circuit to the filter, and output terminals for connecting the neutral conductors of the load circuit to the filter. The filter suppresses the main and higher harmonic components of zero-sequence current and provides the mutual compensation of odd, multiple of three, symmetric higher harmonic components of direct-sequence and reverse-sequence currents. For this purpose, the filter contains two filtering elements, such as the compensating filtering element and the shunting filtering element. The compensating filtering element is designed for mutually compensating the higher harmonic current components with numbers k = 6N +- 1, where N is an arbitrary prime number. The shunting filtering element is designed for suppressing the main and higher harmonic components of zero-sequence current, specifically harmonic components multiple of three. The filter provides a possibility to improve quality of power in an electric network and reduce additional power losses that are possible when nonlinear power consumers are connected to the network.
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