CN202713165U - Grid-connected inverter type distributed power system - Google Patents
Grid-connected inverter type distributed power system Download PDFInfo
- Publication number
- CN202713165U CN202713165U CN 201220296162 CN201220296162U CN202713165U CN 202713165 U CN202713165 U CN 202713165U CN 201220296162 CN201220296162 CN 201220296162 CN 201220296162 U CN201220296162 U CN 201220296162U CN 202713165 U CN202713165 U CN 202713165U
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- inverter
- rectifier
- distributed power
- grid
- connects
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Abstract
The utility model discloses a grid-connected inverter type distributed power system. The grid-connected inverter type distributed power system comprises an electric generator, a rectifier, an inverter, a LC filter and an isolation transformer, wherein the electric generator, the rectifier, the inverter, the LC filter and the isolation transformer are connected successively. The grid-connected inverter type distributed power system further comprises a capacitor. The first output end of the rectifier is connected to the first input end of the inverter. The second output end of the rectifier is connected to the second input end of the inverter. The capacitor is connected between the first input end and the second input end of the rectifier. The isolation transformer is connected to the power grid. According to the utility model, the advantage of better quality of electric energy can be realized, and the situation that zero-sequence component or the direct-current component of the distributed power enters the power grid can be avoided.
Description
Technical field
The utility model relates to a kind of parallel network reverse type distributed power supply system.
Background technology
Distributed power supply system has wide market application foreground.At present, distributed power source is from interface mode, electronic power inverter interface and conventional electric rotating machine interface two large classes are arranged, wherein, the electronic power inverter interface is generally used for the systems such as photovoltaic that the direct current form exists, fuel cell, these distributed power sources generate electricity and can can't directly supply AC load, need to change industrial-frequency alternating current into through inverter, generally all be that inverter is connected to electrical network through reactance now, therefore exist the quality of power supply poor, can't avoid the zero-sequence component of distributed power source to enter the problems such as electrical network.
Summary of the invention
The purpose of this utility model is to overcome the defective of prior art and a kind of parallel network reverse type distributed power supply system is provided, and it is simple in structure, and the quality of power supply that provides is high, and can avoid the zero sequence of distributed power source or DC component to enter electrical network.
The technical scheme that realizes above-mentioned purpose is:
A kind of parallel network reverse type distributed power supply system connects electrical network, and this distributed power supply system comprises generator, rectifier, inverter, LC filter (passive filter) and the isolating transformer that connects successively, also comprises an electric capacity, wherein:
The first output of described rectifier connects the first input end of described inverter, and the second output of described rectifier connects the second input of described inverter;
Described electric capacity is connected between the first input end and the second input of described rectifier;
Described isolating transformer connects described electrical network;
Described generator is exported non-industrial-frequency alternating current;
Described rectifier is rectified into direct current with described non-industrial-frequency alternating current;
Described electric capacity carries out described direct current to pass to described inverter behind the flat ripple, becomes industrial-frequency alternating current through described inverter inversion, and this industrial-frequency alternating current is passed to described electrical network by described LC filter and isolating transformer successively.
The beneficial effects of the utility model are: the utility model is simple in structure, and is with low cost, is easy to realize, has higher practical value.Wherein, the LC filter can provide better quality of power supply output for distributed power source; Isolating transformer plays zero sequence or the DC component of avoiding distributed power source and enters electrical network, and as the effect of the filtering impedance of harmonic current.
Description of drawings
Fig. 1 is the structure chart of parallel network reverse type distributed power supply system of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
See also Fig. 1, parallel network reverse type distributed power supply system of the present utility model, connect electrical network 200, this distributed power supply system comprises generator 1, rectifier 2, inverter 4, LC filter 5 and the isolating transformer 6 that connects successively, also comprise an electric capacity 3, wherein: the first output of rectifier 2 connects the first input end of inverter 4, and the second output of rectifier 2 connects the second input of inverter 4; Electric capacity 3 is connected between the first input end and the second input of rectifier 2; Isolating transformer 6 connects electrical network 200.
In the utility model, generator 1 is generally driven by prime mover, produce and export non-industrial-frequency alternating current, rectifier 2 should be rectified into direct current by non-industrial-frequency alternating current, this direct current passes to inverter 4 behind electric capacity 3 flat ripples, form with two level becomes industrial-frequency alternating current through inverter 4 inversions, this industrial-frequency alternating current is after 5 filtering of LC filter, be passed to electrical network 200 by isolating transformer 6 again, thereby LC filter 5 provides the output of the better quality of power supply for distributed power source, and isolating transformer 6 plays that the zero sequence of avoiding distributed power source or DC component enter electrical network 200 and as the effect of the filtering impedance of harmonic current.
Above embodiment is only for illustration of the utility model, but not to restriction of the present utility model, person skilled in the relevant technique, in the situation that do not break away from spirit and scope of the present utility model, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present utility model, should be limited by each claim.
Claims (1)
1. a parallel network reverse type distributed power supply system connects electrical network, it is characterized in that, this distributed power supply system comprises generator, rectifier, inverter, LC filter and the isolating transformer that connects successively, also comprises an electric capacity, wherein:
The first output of described rectifier connects the first input end of described inverter, and the second output of described rectifier connects the second input of described inverter;
Described electric capacity is connected between the first input end and the second input of described rectifier;
Described isolating transformer connects described electrical network;
Described generator is exported non-industrial-frequency alternating current;
Described rectifier is rectified into direct current with described non-industrial-frequency alternating current;
Described electric capacity carries out described direct current to pass to described inverter behind the flat ripple, becomes industrial-frequency alternating current through described inverter inversion, and this industrial-frequency alternating current is passed to described electrical network by described LC filter and isolating transformer successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220296162 CN202713165U (en) | 2012-06-21 | 2012-06-21 | Grid-connected inverter type distributed power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220296162 CN202713165U (en) | 2012-06-21 | 2012-06-21 | Grid-connected inverter type distributed power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202713165U true CN202713165U (en) | 2013-01-30 |
Family
ID=47593428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220296162 Expired - Lifetime CN202713165U (en) | 2012-06-21 | 2012-06-21 | Grid-connected inverter type distributed power system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202713165U (en) |
-
2012
- 2012-06-21 CN CN 201220296162 patent/CN202713165U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130130 |
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| CX01 | Expiry of patent term |