CN201466992U - Low harmonic wave rectifier - Google Patents
Low harmonic wave rectifier Download PDFInfo
- Publication number
- CN201466992U CN201466992U CN2009201044675U CN200920104467U CN201466992U CN 201466992 U CN201466992 U CN 201466992U CN 2009201044675 U CN2009201044675 U CN 2009201044675U CN 200920104467 U CN200920104467 U CN 200920104467U CN 201466992 U CN201466992 U CN 201466992U
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- filtering circuit
- phase
- rectifier
- low harmonic
- wave rectifier
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Abstract
The utility model relates to a rectifier, which belongs to the technical field of frequency converters, in particular to a low harmonic wave rectifier. The low harmonic wave rectifier comprises a filtering module including three-phase LCL filtering circuit; the three-phase LCL filtering circuit includes three capacitors in triangular connection; each phase filtering circuit includes two reactors in series connection; and damping resistors are respectively connected among nodes of the two reactors in series connection in each phase filtering circuit and three end points of the three capacitors in triangular connection. The damping resistors of the low harmonic wave rectifier can effectively absorb harmonic components of the filtering circuit, the amplitude value of resonant frequency of the filtering circuit can be effectively restrained, and resonance of the filtering circuit is effectively decreased, thereby the low harmonic wave rectifier enables harmonic distortion rate of electric current to be decreased substantially, reduces harmonic pollution to a power grid when the rectifier is in work, leads a system to be more stable, and improves quality of electric energy.
Description
Technical field
The utility model relates to a kind of rectifier, belongs to the converter technology field, is specially low harmonic rectifier.
Background technology
At present, low harmonic rectifier, particularly three-phase LCL low harmonic rectifier can effectively improve the harmonic pollution of power electronic equipment to electrical network, improve the power factor of net side, realize the two-way flow of energy, this technology extensive application in industrial transmission, electric filtering and field of wind power generation.
As shown in Figure 1, three capacitor C1-C3 that comprise connection triangular in shape in the filter circuit of three-phase LCL low harmonic rectifier, every phase filter circuit comprises reactor L1, the L2 of two serial connections, three end points of three capacitor C1-C3 of connection triangular in shape respectively with every filter circuit mutually on reactor L1, the L2 of two serial connections between node link to each other.Three-phase LCL low harmonic rectifier effect aspect the filtering high order harmonic component is better, and its total inductance value is also smaller, uses to have very large advantage on powerful device, and still, low harmonic rectifier exists resonance problems when work.Resonance can make the percent harmonic distortion of electric current increase, the percent harmonic distortion of electric current increases a lot of harm of generation, as: cause the power transformer heating, cause the power cable heating, can produce the electronic equipment that works in low voltage level and disturb, make this electronic equipment control not normal, thus initiating system generation catastrophe failure.And harmonic distortion can make the distribution low voltage equipment, as: circuit breaker, earth leakage protective device, contactor, thermal relay etc. break down.If do not take the resonance of the low harmonic pulse rectifier of better controlled strategy inhibition, then can cause the instability of system.
Summary of the invention
The utility model produces resonance in the course of the work in order to solve existing low harmonic rectifier, and the percent harmonic distortion of electric current is increased, and causes system's instability, even problem such as break down, and a kind of hot low harmonic rectifier is provided.
The utility model is to adopt following technical scheme to realize: low harmonic rectifier, comprise filtration module, filtration module comprises three-phase LCL filter circuit, three-phase LCL filter circuit comprises three capacitors of connection triangular in shape, every phase filter circuit comprises the reactor of two serial connections, is connected with damping resistance respectively between three end points of the connected node between the reactor of two serial connections in every phase filter circuit and three capacitors that are connected triangular in shape.
For suppressing the resonance of low harmonic rectifier, can take to increase the method for filter damping resistance, promptly be connected with damping resistance respectively between three end points of the connected node of the reactor of two serial connections in every phase filter circuit and three capacitors that are connected triangular in shape.Damping resistance can effectively absorb the harmonic components of filter circuit, effectively reduces filter circuit generation resonance.
Low harmonic rectifier described in the utility model has suppressed the influence of LC resonance to system reliability, reduce harmonic rectifier and produced resonance in the course of the work, the percent harmonic distortion of electric current is reduced, reduced it at work to the harmonic pollution of electrical network, and make system more stable, improved the quality of electric energy.
Description of drawings
Fig. 1 is the circuit diagram of existing three-phase LCL low harmonic rectifier filtration module;
Fig. 2 is the circuit diagram of three-phase LCL low harmonic rectifier filtration module described in the utility model.
Embodiment
Now in conjunction with the accompanying drawings embodiment of the present utility model is described further.
Low harmonic rectifier, comprise filtration module, filtration module comprises three-phase LCL filter circuit, three-phase LCL filter circuit comprises three capacitor C1-C3 of connection triangular in shape, every phase filter circuit comprises reactor L1, the L2 of two serial connections, is connected with damping resistance R1, R2, R3 respectively between three end points of the connected node between reactor L1, the L2 of two serial connections in every phase filter circuit and three capacitor C1-C3 that are connected triangular in shape.
For suppressing the resonance of low harmonic rectifier, can on filter circuit, increase damping resistance, promptly be connected with damping resistance R1, R2, R3 respectively between three end points of the node of reactor L1, the L2 of two serial connections in every phase filter circuit and three capacitor C1-C3 that are connected triangular in shape, as shown in Figure 2.In every phase filter circuit, L1C is used for the filtering harmonic wave, satisfies the requirement of electrical network to current harmonics, and reactor L2 also has and boosts and the energy exchange function except that filtering.
In this filter circuit, damping resistance can effectively absorb the harmonic components of filter circuit, and the amplitude of filter circuit resonance frequency can obtain good restraining, has reduced the resonance of filter circuit effectively, thereby the percent harmonic distortion of electric current is reduced significantly.
Claims (1)
1. low harmonic rectifier, comprise filtration module, filtration module comprises three-phase LCL filter circuit, three-phase LCL filter circuit comprises three capacitors (C1-C3) of connection triangular in shape, every phase filter circuit comprises the reactor (L1, L2) of two serial connections, it is characterized in that: be connected with damping resistance (R1, R2, R3) respectively between three end points of the connected node between the reactor of two serial connections in every phase filter circuit (L1, L2) and three capacitors (C1-C3) that are connected triangular in shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201044675U CN201466992U (en) | 2009-08-28 | 2009-08-28 | Low harmonic wave rectifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201044675U CN201466992U (en) | 2009-08-28 | 2009-08-28 | Low harmonic wave rectifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201466992U true CN201466992U (en) | 2010-05-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201044675U Expired - Fee Related CN201466992U (en) | 2009-08-28 | 2009-08-28 | Low harmonic wave rectifier |
Country Status (1)
| Country | Link |
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| CN (1) | CN201466992U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694457A (en) * | 2011-03-21 | 2012-09-26 | 季平 | Frequency converter output DVDT filter |
| CN102710145A (en) * | 2012-06-19 | 2012-10-03 | 深圳市英威腾电气股份有限公司 | Large-power four-quadrant converter and electric power transformation device |
-
2009
- 2009-08-28 CN CN2009201044675U patent/CN201466992U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694457A (en) * | 2011-03-21 | 2012-09-26 | 季平 | Frequency converter output DVDT filter |
| CN102710145A (en) * | 2012-06-19 | 2012-10-03 | 深圳市英威腾电气股份有限公司 | Large-power four-quadrant converter and electric power transformation device |
| CN102710145B (en) * | 2012-06-19 | 2016-02-03 | 深圳市英威腾电气股份有限公司 | A kind of high-power four-quadrant frequency converter and power-converting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20140828 |
|
| EXPY | Termination of patent right or utility model |