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Chain type filter

A filter and chain technology, applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve the problems of increasing the cost of filter circuits, affecting the filtering effect, and high energy consumption, and achieving the filtering compensation effect. Good, no harmonic amplification, low energy consumption

Active Publication Date: 2015-01-07
江苏嘉诚中贝能源科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, due to the increasingly common application of power electronic equipment, the harmonic values ​​generated by industrial and civil loads are large, and the spectrum distribution is also very wide. Harmonics and higher harmonics up to the 47th lead to increased filter circuit costs and high energy consumption; in addition, the existing filter circuit, when system parameters (such as system frequency, capacitors and inductance in the filter) due to seasonal temperature changes When a deviation occurs, it will affect the filtering effect

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Embodiment 1

[0054] like figure 2 As shown, in the embodiment of the present invention, n is an integer. In the embodiment of the present invention, n=4, a 4th order chain filter is connected to the 0.40KV side of a 400KVA power supply transformer. The short-circuit impedance of the transformer is 4%, the high-voltage side is 10KV, and the short-circuit capacity of the 10KV connection point is 100MVA. The load of the transformer produces 3, 5, 7, 11, 13 mainly odd harmonics and a certain number of 4, 6 even harmonics. In the embodiment of the present invention, the non-inductive resistor is "a high-power non-inductive wirewound resistor" with the application date of August 1, 2011 and the application number: 2011102190967.

[0055] image 3 After the chain filter is connected, the relationship between the harmonic amplification factor and the harmonic order of the system; the amplification factor refers to the harmonic current value injected into the system when the harmonic source inje...

Embodiment 2

[0059] In this project example, for a transformer with a capacity of 400KVA, a transformation ratio of 10KV / 0.4KV, and a short-circuit impedance UK=0.04, the transformer is connected to a 10KV network with a short-circuit capacity of 100MVA, and its 0.4KV is a 6-pulse rectifier load. Active power p=320KW and reactive power q=310KVAR during normal operation, generating 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 13 harmonics, and the harmonic currents are: 26A, 10.5A, 107A, 8A, 72.2A, 7.5A, 14A, 4.2A, 52.5A, 9A, 45A, resulting in the total voltage distortion rate of 0.4KV bus reaching 8.556%, power factor = 0.7182;

[0060]In this engineering example, in order to improve the power factor and eliminate harmonics, 2 sets of 4th order chain filters were put into use, and the non-inductive resistors were used as "a large Power Non-Inductive Wirewound Resistors". The device parameters of the chain filter are shown in Table 1 to Table 5;

[0061] Table 1

[0062]

[0063] Table 2

[...

Embodiment 3

[0079] In this embodiment, the parameters of a certain power supply transformer are: the capacity is 1200KVA, the transformation ratio is 10KV / 0.4KV, the short-circuit impedance UK=0.046, it is connected to the 10KV network with the short-circuit capacity of 100MVA, and its 0.4KV is the comprehensive load. Active power p=816KW, reactive power q=612KVAR, generating harmonics from 2nd to 25th, harmonic currents are: 4.3303A, 95.2656A, 6.0624A, 280.6005A, 2.5982A, 19.9769A, 1.7321A, 4.3303 A, 3.4642A, 116.0508A, 2.5982A, 85.9122A, 3.4642A, 6.0624A, 1.7321A, 60.6236A, 3.4642A, 30.8314A, 3.4642A, 17.7540A, 1.7321A, 18.4122A, 1.78419A, 1.7832A As a result, the total voltage distortion rate of the 0.4KV bus reaches 9.0386%, and the power factor is 0.80.

[0080] In order to improve the power factor and eliminate harmonics, in this embodiment, 3 sets of 2nd order chain filters, 2 sets of 3rd order chain filters and 6 sets of 4th order chain filters are put into use. The total compensa...

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Abstract

The invention provides a chain type filter, and belongs to the technical field of power electronics. The filter circuit structure has the advantages of being wide in smoothing spectrum, good in smoothing complementation effect, free of harmonic amplification and low in energy consumption. When system parameters, such as system frequency and capacitance and inductance in the filter, generate deviation due to seasonal temperature change, the smoothing effect of the filter cannot be affected, and the filter plays a great role in treating power system smoothing pollution.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a chain filter. Background technique [0002] At present, due to the increasingly common application of power electronic equipment, the harmonic values ​​generated by industrial and civil loads are large, and the spectrum distribution is also very wide. Harmonics and higher harmonics up to the 47th lead to increased filter circuit costs and high energy consumption; in addition, the existing filter circuit, when system parameters (such as system frequency, capacitors and inductance in the filter) due to seasonal temperature changes When a deviation occurs, it will affect the filtering effect. Contents of the invention [0003] Aiming at the shortcomings of the prior art, the present invention proposes a chain filter to achieve the purpose of effectively, economically and energy-savingly filtering harmonics and improving the effect of filter compensation. ...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 肖惕刘学宝肖裕胡中奇张巍孙世明
Owner 江苏嘉诚中贝能源科技有限公司
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