Passive filter arrangement especially for 12 impulse rectification load
A technology of pulse rectification and passive filtering, which is applied in the direction of output power conversion devices and electrical components, and can solve the problems of high investment and complicated control
Active Publication Date: 2008-09-24
广州明德电力技术有限公司
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Problems solved by technology
Technically, this solution is the best solution to the problem of 12-pulse rectification load harmonics, but due to its high investment and complicated control, it is still difficult to be widely used in power systems in a short period of time
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[0016] The present invention will be further described below in conjunction with accompanying drawing of description:
[0017] Such as figure 1 The shown is a dedicated passive filter device for 12-pulse rectification load, including a filter channel, a single-phase transformer 2 is set on each phase of the filter channel, and one end of the winding on one side of the single-phase transformer 2 is connected in a "Y"-shaped connection , the other end is connected in series with the L-C filter branch 1 and then connected to the end of the "Y" side of the 12-pulse rectifier load 3; one end of the winding on the other side of the single-phase transformer 2 is connected in a "△"-shaped connection, and the other end is connected in series with L-C After filtering branch 1, it is correspondingly connected with the end of "△" side of 12-pulse rectification load 3 . Among them, the transformation ratio between the "Y"-shaped connection side and the "△"-shaped connection side in the si...
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A passive power device specifically used for 12-pulse commutating load belongs to the technical field of the electricity quality control device of a power distribution system and is characterized in that the device includes a wave filtering channel; each phase of the wave filtering channel is provided with a single-phase transformer; one end of the winding at one side of the single-phase transformer is connected by adopting a 'Y'-type connection mode; the other end is connected correspondingly with the tail end at the 'Y' side of the 12-pulse commutating load after connected with an L-C filtering branch circuit in series; one end of the winding at the other side of the single-phase transformer is connected by adopting a 'Delta' connection mode; the other end is connected with the tail end at the 'Delta' side of the 12-pulse commutating load after connected with an L-C filtering branch circuit in series. The passive power device specifically used for 12-pulse commutating load has the advantages of novel design and simple structure, avoiding the harmonic currents of 5 and 7 simultaneously while effectively filtering the harmonic currents of 11 and 13 as well as having the advantages of good wave filtering effect, reliable operation and lower cost.
Description
technical field [0001] The invention belongs to the technical field of power quality control equipment for power distribution systems, and in particular relates to a passive filter device specially suitable for 12-pulse rectification loads. Background technique [0002] With the extensive application of high-power power electronic devices in the power system, various thyristor rectifier loads generate a large number of harmonics, which seriously threatens the safe and stable operation of the power system. Among them, 12-pulse rectification is widely used for its low harmonic output A large number of high-power loads. Compared with 6-pulse rectification, 12-pulse rectification eliminates the 5th and 7th harmonics on the high-voltage side of the transformer and reduces the harmonic output, but it also brings difficulties to the passive filtering of 12-pulse rectification loads. At present, there are mainly three solutions to solve the harmonic problem of 12-pulse rectified lo...
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Inventor 李阳春
Owner 广州明德电力技术有限公司