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a chain filter

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

Active Publication Date: 2016-08-17
江苏嘉诚中贝能源科技有限公司
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  • Abstract
  • Description
  • 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

[0052] Such as figure 2 As shown, in the embodiment of the present invention, the n is an integer. In the embodiment of the present invention, n=4, a quadruple 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 this 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 adopts "a high-power non-inductive wire wound resistor" with the application date of August 1, 2011 and the application number: 2011102190967.

[0053] image 3 It is the relationship between the harmonic amplification factor of the system and the harmonic order after the chain filter is connected; the amplification factor refers to the value of the harmonic current injected into the system when the ...

Embodiment 2

[0057] 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. In normal operation, active power p=320KW, reactive power q=310KVAR, generating 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 13 harmonics. The harmonic currents are 26A, 10.5A, 107A, 8A, 72.2A, 7.5A, 14A, 4.2A, 52.5A, 9A, 45A, causing the total voltage distortion rate of the 0.4KV bus to reach 8.556%, and the power factor = 0.7182;

[0058] In this project example, in order to improve the power factor and eliminate the harmonics, two sets of 4th-order chain filters are used. The application date of the non-inductive resistance is August 1, 2011, and the application number is: 2011102190967. Power non-inductive wire wound resistor". The device parameters of the chain filter are shown in Table 1 to Table 5;

...

Embodiment 3

[0077] In this embodiment, a certain power supply transformer has the following parameters: capacity is 1200KVA, transformation ratio is 10KV / 0.4KV, short-circuit impedance UK=0.046, connected to a 10KV network with a short-circuit capacity of 100MVA, 0.4KV is the comprehensive load, and in normal operation Active power p=816KW, reactive power q=612KVAR, generating from 2 to 25 harmonics, the 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, 1.7321A, 4.8499A; As a result, the total voltage distortion rate of the 0.4KV bus bar reaches 9.0386%, and the power factor=0.80.

[0078] In order to improve the power factor and eliminate harmonics, in this embodiment, 3 sets of second-order chain filters, 2 sets of third-order chain filters, and 6 sets of fourth-order chain filters are used. 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 specifically relates to a chain filter. Background technique [0002] At present, due to the increasing popularity of power electronic equipment, the harmonics produced by industrial and civil loads have large numerical values, and the spectrum distribution is also very wide. There are not only common 3, 5, 7, 11 harmonics, but also even harmonics with large values. Harmonics and high-order harmonics up to the 47th order increase the cost of the filter circuit and consume more energy; in addition, the existing filter circuit, when the system parameters (such as system frequency, capacitance and inductance in the filter) change due to seasonal temperature When deviation occurs, the filtering effect will be affected. Summary of the invention [0003] Aiming at the shortcomings of the prior art, the present invention proposes a chain filter to achieve the purpose of filtering harmonics effe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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