CN210692327U - Grid-side inductor and inverter parallel operation system - Google Patents
Grid-side inductor and inverter parallel operation system Download PDFInfo
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- CN210692327U CN210692327U CN201922303521.5U CN201922303521U CN210692327U CN 210692327 U CN210692327 U CN 210692327U CN 201922303521 U CN201922303521 U CN 201922303521U CN 210692327 U CN210692327 U CN 210692327U
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Abstract
The utility model relates to a net side inductor, dc-to-ac converter parallel operation system, net side inductor includes: the single-phase inductor monomer comprises an upper iron yoke, a single-phase common-mode iron core and a lower iron yoke; the upper end of the single-phase common mode iron core is connected with the lower end of the upper iron yoke, and the lower end of the single-phase common mode iron core is connected with the upper end of the lower iron yoke; the single-phase common mode iron core adopts a two-phase three-column iron core and comprises a central column magnetic core and central column magnetic cores at two sides, and two windings are symmetrically wound on the central column magnetic cores at two sides; the two windings are respectively led out of an input row and connected with a shared output row. The utility model also applies the network side inductor to the parallel operation system of the inverter, the three-phase magnetic circuit of the network side inductor is completely independent, and the three-phase filtering effect is realized; the structure can achieve three-phase common-mode inductance, improve single-phase common-mode inductance, and effectively inhibit the circulation between the whole machine and the ground and the circulation between parallel machines.
Description
Technical Field
The utility model belongs to the technical field of the inductor, especially, relate to a net side inductor, dc-to-ac converter parallel operation system.
Background
With the development of the photovoltaic industry, the photovoltaic inverter runs by adopting a grid-side parallel operation, and the grid-side parallel operation are integrated to save cost and volume. In addition, because the inverter system has both differential mode and common mode interference, the network side inductor needs to satisfy both the requirement of differential mode inductance and higher common mode inductance in order to filter the above two kinds of interference.
According to the traditional design scheme, each inverter independently uses a three-phase network side inductor, the scheme is high in cost and large in occupied space, the inductors can only meet the requirement of differential mode inductance and can not meet the requirement of a common mode, and certain risks exist during system operation.
Therefore, it is necessary to provide a grid-side inductor that can satisfy both the requirements of the differential and common mode inductance for the differential and common mode interference existing in the system when the inverters are connected in parallel.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the not enough of above-mentioned current net side inductor existence in the parallel operation system, provide a net side inductor, dc-to-ac converter parallel operation system, this net side inductor can be used to the poor common mode interference suppression and the circulation suppression of dc-to-ac converter parallel operation system.
In order to achieve the above object, the utility model provides a net side inductor, include:
the single-phase inductor monomer comprises an upper iron yoke, a single-phase common-mode iron core and a lower iron yoke; the upper end of the single-phase common mode iron core is connected with the lower end of the upper iron yoke, and the lower end of the single-phase common mode iron core is connected with the upper end of the lower iron yoke; the single-phase common mode iron core adopts a two-phase three-column iron core and comprises a central column magnetic core and central column magnetic cores at two sides, and two windings are symmetrically wound on the central column magnetic cores at two sides; the two windings are respectively led out of an input row and connected with a shared output row.
Preferably, the two input rows are symmetrically arranged at two sides of the upper iron yoke and arranged along the length direction of the upper iron yoke; the output row is arranged between the two windings and arranged along the width direction of the upper iron yoke.
Preferably, the grid-side inductor comprises three single-phase inductor monomers, and magnetic paths between the single-phase inductor monomers are independent.
Preferably, each single-phase inductor monomer is sequentially installed and fixed on the same installation base, and the lower end of the lower iron yoke is connected with the installation base.
The utility model also provides an inverter parallel operation system, each inverter is parallelly connected, net side filter circuit adopts net side inductor.
Compared with the prior art, the utility model discloses an advantage lies in with positive effect:
the utility model provides a net side inductor can be used to the poor common mode interference rejection and the circulation suppression of dc-to-ac converter parallel operation system. The grid detection inductor is formed by combining three independent single-phase inductor monomers, the maximization of three-phase common-mode inductance is realized, and three-phase common-mode current and circulating current after parallel operation are effectively filtered. Meanwhile, each single-phase inductor monomer adopts a two-phase three-column structure, so that the single-phase common-mode inductance is increased, and the effect of filtering three-phase common-mode current and circulating current after parallel operation is improved; and each single-phase inductor monomer output row is the sharing row, and the complete machine wiring of being convenient for accomplishes the parallel operation, reduce cost, reduce the volume.
Drawings
Fig. 1 is an overall structure diagram of a network-side inductor of the present invention;
FIG. 2 is a front view of a single-phase inductor cell structure;
FIG. 3 is a left side view of a single phase inductor cell structure;
FIG. 4 is a structure diagram of a single-phase common mode iron core;
FIG. 5 is a schematic diagram of single phase-difference common mode interference rejection;
FIG. 6 is a schematic diagram of a single-phase circulating current suppression scheme;
fig. 7 is a schematic diagram of three-phase circulation suppression;
wherein: 1-single-phase inductor monomer, 11-upper iron yoke, 12-single-phase common mode iron core, 121-center pillar magnetic core, 122-center pillar magnetic core, 13-lower iron yoke, 14-winding, 15-input row, 16-output row and 2-installation base.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention and the above-described drawings are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
The embodiment of the utility model provides a net side inductor can be used to the difference common mode interference suppression and the circulation suppression of inverter parallel operation system. Referring to fig. 1, the grid-side inductor comprises three single-phase inductor units 1, magnetic paths of the single-phase inductor units 1 are independent, and the single-phase inductor units 1 are sequentially mounted and fixed on the same mounting base 2. Each single-phase inductor monomer is independently arranged, three-phase common mode inductance maximization is realized, and three-phase common mode current and circulating current after parallel operation are effectively filtered.
As for the single-phase inductor cell 1, as shown in fig. 2, 3, and 4, the single-phase inductor cell includes an upper yoke 11, a single-phase common mode core 12, and a lower yoke 13. The upper end of the single-phase common mode iron core 12 is connected with the lower end of the upper iron yoke 11, and the lower end of the single-phase common mode iron core 12 is connected with the upper end of the lower iron yoke 13. In this embodiment, the single-phase common mode iron core 12 specifically adopts a two-phase three-column iron core, which includes a center column magnetic core 121 and a center column magnetic core 122 at two sides, and two windings 14 are symmetrically wound on the center column magnetic cores 121 at two sides; the two windings 14 each lead out of an input row 15 and are connected to a common output row 16. At this time, the input current is input from the input lines 15 on both sides and is output from the common output line 16. In this embodiment, the single-phase common mode iron core 12 specifically adopts a two-phase three-column iron core, so that the single-phase common mode inductance is increased, and the effects of filtering three-phase common mode current and circulating current after parallel operation are improved. Meanwhile, the output row of each single-phase inductor monomer is set as a shared row and used as a wiring terminal to finish parallel operation, so that the cost is reduced, and the size is reduced.
Referring further to fig. 1 and 3, in the present embodiment, two input rows 15 are symmetrically disposed on two sides of the upper iron yoke 11 and are disposed along the length direction of the upper iron yoke 11; the output row 16 is disposed between the two windings 14 and along the width of the upper yoke 11 to facilitate wiring when the grid-side inductor is connected to the inverter parallel operation system.
In the embodiment, each single-phase common mode iron core is a 'ri' -shaped two-phase three-column iron core which is fastened by a pull rod to form a whole. Of course, the two-phase three-column iron core can also be designed by two single-phase two-column iron cores, and an insulating plate is arranged between the two iron cores.
To sum up, the utility model provides a net side inductor forms by the combination of three independent single-phase inductor monomer, has realized three-phase common mode inductance maximize, the circulation after effective filtering three-phase common mode current and the parallel operation. Meanwhile, each single-phase inductor monomer is of a two-phase three-column structure, so that the single-phase common-mode inductance is increased, and the effects of filtering three-phase common-mode current and circulating current after parallel operation are improved; and each single-phase inductor monomer output row is the sharing row, and the complete machine wiring of being convenient for accomplishes the parallel operation, reduce cost, reduce the volume. The utility model discloses still be applied to in parallel operation systems such as dc-to-ac converter parallel operation system or UPS power parallel operation with foretell net side inductor, parallelly connected with each dc-to-ac converter, net side filter circuit adopts the net side inductor that above-mentioned embodiment provided to reach three-phase common mode inductance volume, effectively restrain circulation between complete machine and the ground and the circulation between the parallel operation.
For a detailed understanding of the inductor of the present invention, the following detailed description of the working principle of the inductor of the present invention is provided:
according to the electromagnetic principle, as shown in fig. 5, when the amplitude of the winding a (B/C) is the same as that of the winding a (B/C) and the polarity of the winding a (B/C) differs by 120 ° differential mode signals, according to the right-hand spiral rule, the magnetic path generates a magnetic flux Φ (a + a) to present a high impedance state, so that differential mode interference is effectively filtered; because the network side inductor is three-phase independent and does not interfere with each other, the working principle of common mode signal rejection is the same as that of differential mode signals.
As shown in fig. 6, when the amplitude of the winding a (B/C) is the same and the polarity differs by 120 ° differential mode signals, parallel machine circulating current flows out from the winding a (B/C), magnetic flux Φ a and Φ a are generated in the magnetic circuit, a loop is formed by the central column magnetic core, a high impedance state is presented, and circulating current interference is effectively filtered; because the network-side inductor is three-phase independent and does not interfere with each other, the working principle of three-phase circulation suppression is the same as that of single-phase circulation suppression, as shown in fig. 7.
Claims (5)
1. A net-side inductor, comprising: the single-phase inductor monomer comprises an upper iron yoke, a single-phase common-mode iron core and a lower iron yoke; the upper end of the single-phase common mode iron core is connected with the lower end of the upper iron yoke, and the lower end of the single-phase common mode iron core is connected with the upper end of the lower iron yoke; the single-phase common mode iron core adopts a two-phase three-column iron core and comprises a central column magnetic core and central column magnetic cores at two sides, and two windings are symmetrically wound on the central column magnetic cores at two sides; the two windings are respectively led out of an input row and connected with a shared output row.
2. The net-side inductor according to claim 1, wherein two input rows are symmetrically disposed on both sides of the upper yoke and arranged along a length direction of the upper yoke; the output row is arranged between the two windings and arranged along the width direction of the upper iron yoke.
3. The grid-side inductor according to claim 1 or 2, comprising three single-phase inductor cells, wherein the magnetic path between each single-phase inductor cell is independent.
4. The grid-side inductor according to claim 3, wherein each single-phase inductor unit is sequentially mounted and fixed on the same mounting base, and the lower end of the lower iron yoke is connected with the mounting base.
5. An inverter parallel operation system, characterized in that inverters are connected in parallel, and a grid-side filter circuit adopts a grid-side inductor as claimed in any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922303521.5U CN210692327U (en) | 2019-12-19 | 2019-12-19 | Grid-side inductor and inverter parallel operation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922303521.5U CN210692327U (en) | 2019-12-19 | 2019-12-19 | Grid-side inductor and inverter parallel operation system |
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| Publication Number | Publication Date |
|---|---|
| CN210692327U true CN210692327U (en) | 2020-06-05 |
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| CN201922303521.5U Active CN210692327U (en) | 2019-12-19 | 2019-12-19 | Grid-side inductor and inverter parallel operation system |
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| CN (1) | CN210692327U (en) |
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