| 摘要 |
For realising the method of current injection an active filter arrangement for filtering harmonic current components generated by a nonlinear consumer connected to a power system is proposed, which comprises a harmonics source (8) for injecting current components of predetermined frequency into a bus bar (4) to be filtered, coupled with a regulating system (7), a supervising system (13), a low-pass filter (9), a series resonance circuit (10) tuned to a fundamental frequency determined for a power system and a coupling capacitance (12). The essence of the proposed filter arrangement lies in its further comprising a first current transformer (3) for measuring harmonic components of a current filtered and a second current transformer (5) for measuring harmonic components generated by a nonlinear consumer (6) to be filtered, the first and second current transformers (3, 5) being arranged by their respective primary terminals along the bus bar (4) to be filtered, wherein the first current transformer (3) is connected to the supervising system (13) and through this system to the regulating system (7), the regulating system (7) is coupled over an input with the current signal output of the second current transformer (5) and over an output connected to the harmonics source (8) with the low-pass filter (9) and via the latter with a common terminal (11) of the series resonance circuit (10) and the coupling capacitance (12), the coupling capacitance (12) being connected with a section of the bus bar (4) to be filtered, the section being arranged between the primary terminals of the first and second current transformers (3, 5). |
