CN204168134U - A kind of many level grid-connected inverters filtering system - Google Patents
A kind of many level grid-connected inverters filtering system Download PDFInfo
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- CN204168134U CN204168134U CN201420515444.4U CN201420515444U CN204168134U CN 204168134 U CN204168134 U CN 204168134U CN 201420515444 U CN201420515444 U CN 201420515444U CN 204168134 U CN204168134 U CN 204168134U
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- branch road
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- inverter filtering
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- 239000003990 capacitor Substances 0.000 claims abstract description 29
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- 230000006855 networking Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Abstract
This application provides a kind of many level grid-connected inverters filtering system, when this system comprises multiple grid-connected inverter filtering branch road, and each inverter filtering branch road is when including the direct current inlet highway, EMI filter, IGBT power device and the rear class filter that connect successively, the application is in parallel after passing through the level line being arranged in multiple bus capacitors that IGBT power device is connected in each inverter filtering branch road to be run through the EMI filter of place inverter filtering branch road, and this level line is the equipotential line of the points of common connection of two adjacent bus capacitors.In actual applications, even if the level line of each inverter filtering branch road exists electric current I
n, direct current inlet highway exists electric current-I
n, because the level line of the bus capacitor in each inverter filtering branch road and inlet highway all can run through the EMI filter of place inverter filtering branch road, thus, this EMI filter can't at bias current I
nbasis works, thus ensure that the filter effect of this EMI filter.
Description
Technical field
The utility model relates generally to parallel network power generation technical field, relates to a kind of many level grid-connected inverters filtering system more specifically.
Background technology
At present, in the application scenario of relatively high power, the multiple stage small-power combining inverter parallel connection of many employings common bus obtains required relatively high power, wherein, many level grid-connected inverters of this small-power inverter normally diode clamp type, in the prior art, the bus mid point of the many level grid-connected inverters of multiple stage in parallel is direct interconnection, and, every platform many level grid-connected inverters direct current input positive and negative busbar all can be provided with EMI (Electromagnetic Interference, electromagnetic interference) filter, filtering electromagnetic interference, to improve many level grid-connected inverters quality of output signals, reduce the impact on electrical network.
But, in the practical application of existing many level grid-connected inverters filtering system, when many level grid-connected inverters operational factor non complete symmetry of multiple stage parallel connection runs, as the many level grid-connected inverters of part in many level grid-connected inverters in parallel run, and another part is not when running, will be there is fluctuation in DC bus mid-point voltage, the N line that so interconnects will exist electric current I
n, thus make every platform many level grid-connected inverters direct current inlet highway electric current be-I
n, now, just to access multi-electrical level inverter after the magnet ring of the common mode inductance in EMI filter because this direct current inlet highway is through, thus, this common mode inductance magnet ring is necessarily at bias current I
nbasis works, is easy to make magnet ring saturated, thus has a strong impact on the filter effect of EMI filter.
Utility model content
In view of this, the utility model provides a kind of many level grid-connected inverters filtering system, solves in prior art, because the common mode inductance magnet ring in EMI filter is at bias current I
nbasis works, and causes this magnet ring saturated, thus have a strong impact on the problem of the filter effect of EMI filter.
To achieve these goals, this application provides following technical scheme:
A kind of many level grid-connected inverters filtering system, described system comprises: the inverter filtering branch road of multiple parallel connection, described in each, inverter filtering branch road includes: the direct current inlet highway connected successively, EMI filter, IGBT power device and rear class filter, wherein:
The level line being arranged in multiple bus capacitors that described IGBT power device is connected in each inverter filtering branch road is in parallel after running through the EMI filter of place inverter filtering branch road, and described level line is the equipotential line of the points of common connection of two bus capacitors adjacent in multiple bus capacitors of described series connection;
The correspondence of the described direct current inlet highway in each inverter filtering branch road is extremely in parallel.
Preferably, described EMI filter comprises the common mode inductance be made up of at least one magnet ring.
Preferably, described EMI filter also comprises: the filter capacitor be connected with described common mode inductance output.
Preferably, described rear class filter is L-type filter, LC mode filter or LCL type filter.
Preferably, described system also comprises: at least one interconnection device, then the level line of multiple bus capacitors of connecting in adjacent two inverter filtering branch roads is by being connected one by one with described interconnection device two ends after the EMI filter of place inverter filtering branch road;
Wherein, few one of the quantity of multiple grid-connected inverter filtering branch road described in the number ratio of described multiple interconnection device.
Preferably, described interconnection device is specially contactor or relay.
Preferably, when described interconnection device is multiple, described interconnection device comprises contactor and relay.
As can be seen here, compared with prior art, this application provides a kind of many level grid-connected inverters filtering system, when this system comprises multiple grid-connected inverter filtering branch road, and each inverter filtering branch road includes the direct current inlet highway connected successively, EMI (Electromagnetic Interference, electromagnetic interference) filter, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) power device and rear class filter time, the utility model is in parallel after passing through the level line being arranged in multiple bus capacitors that IGBT power device is connected in each inverter filtering branch road to be run through the EMI filter of place inverter filtering branch road, this level line is the equipotential line of the points of common connection of two adjacent bus capacitors.Based on this system configuration, even if there is electric current I in many level bus mid point interconnection N line of each inverter filtering branch road
n, inlet highway exists electric current-I
n, because the level line of the bus capacitor in each inverter filtering branch road and inlet highway all can run through the EMI filter of place inverter filtering branch road, thus, this EMI filter can't bias current I
nbasis works, thus improves the filter effect of this EMI filter.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the structural representation of a kind of many level grid-connected inverters filtering system of the utility model embodiment;
Fig. 2 is the structural representation of the utility model another kind of many level grid-connected inverters filtering system embodiment;
Fig. 3 is the structural representation of a kind of three level combining inverter of the utility model filtering system embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model provides a kind of many level grid-connected inverters filtering system, when this system comprises multiple grid-connected inverter filtering branch road, and each inverter filtering branch road includes the direct current inlet highway connected successively, EMI (Electromagnetic Interference, electromagnetic interference) filter, IGBT (InsulatedGate Bipolar Transistor, insulated gate bipolar transistor) power device and rear class filter time, the utility model is in parallel after passing through the level line being arranged in multiple bus capacitors that IGBT power device is connected in each inverter filtering branch road to be run through the EMI filter of place inverter filtering branch road, this level line is the equipotential line of the points of common connection of two adjacent bus capacitors.Based on this system configuration, even if there is electric current I in many level bus mid point interconnection N line of each inverter filtering branch road
n, inlet highway exists electric current-I
n, because the level line of the bus capacitor in each inverter filtering branch road and inlet highway all can run through the EMI filter of place inverter filtering branch road, thus, this EMI filter can't bias current I
nbasis works, thus improves the filter effect of this EMI filter.
As shown in Figure 1, for the structural representation of a kind of many level grid-connected inverters filtering system of the utility model embodiment, this system can comprise: the inverter filtering branch road of multiple parallel connection, each inverter filtering branch road all can comprise: the direct current inlet highway DC connected successively is (in order to distinguish direct current inlet highway in each inverter filtering branch road, Fig. 1 has carried out label, as DC to each direct current input positive and negative busbar
1+, DC
2+ ..., DC
n+, N is integer), EMI filter 110, IGBT power device 120 and rear class filter 130, Fig. 1 only carried out label to the device that an inverter filtering branch road comprises, other inverter filtering branch roads are similar, wherein:
The level line being arranged in multiple bus capacitors that IGBT power device 120 is connected in each inverter filtering branch road runs through the rear parallel connection of EMI filter 110 of place inverter filtering branch road, electrical network is accessed after rear class filter 130 output parallel connection in each inverter filtering branch road, certainly, each inverter filtering branch road is not limited to the connected mode networked in parallel, it also can from guipure loaded work piece, now, its rear class filter 130 output can directly be connected with load.
Wherein, multiple bus capacitors of series connection are connected in parallel between direct current inlet highway DC+ and DC-of place inverter filtering branch road, and this level line is the equipotential line of the points of common connection of two bus capacitors adjacent in multiple bus capacitors of series connection, can be designated as N line.
It should be noted that, the concrete structure of the IGBT power device in the present embodiment can see IGBT power device in existing many level grid-connected inverters filtering system, and the application is not described in detail in this.
Optionally, this EMI filter 110 can comprise the common mode inductance (as shown in Figure 1) be made up of at least one magnet ring, on this basis, this EMI filter 110 can also comprise the filter capacitor (not drawing in Fig. 1) be connected with common mode inductance output end.
Based on this, as shown in Figure 1, after direct current input positive and negative busbar DC+ and DC-in each inverter filtering branch road is all through the magnet ring of the common mode inductance of this inverter filtering branch road, access IGBT power device 120, namely be connected with the positive and negative busbar (as a and b point in figure) of this IGBT power device 120, and the networking in parallel after LC filter 130 of the output of this IGBT power device 120; And, be connected in parallel after in each inverter filtering branch road, in IGBT power device 120, the N line of multiple bus capacitors of series connection is also through the magnet ring of respective common mode inductance.So, when only having part inverter to work in this system, although there is circulation between the inverter of parallel connection, and also there is non-vanishing electric current in the N line of parallel connection, but, because the direct current inlet highway of each inverter filtering branch road and N line all run through the magnet ring of EMI filter 110, thus ensure that the filter effect of this EMI filter.
Wherein, LC filter 130 can be L-type, LC type or LCL type filter, and it is one of common topological structure of photovoltaic DC-to-AC converter, and the application is not described in detail in this.
Optionally, for the interconnection of the N line of adjacent inverter filtering branch road, can directly connect (as shown in Figure 1), also can be connected by interconnection device, thus, as another embodiment of the utility model, as shown in Figure 2, this system can also comprise at least one interconnection device 140, to make the level line being arranged in multiple bus capacitors that IGBT power device is connected in adjacent two inverter filtering branch roads by being connected one by one with the two ends of an interconnection device after the EMI filter of place inverter filtering branch road, thus the N line of adjacent inverter filtering branch road is connected by an interconnection device, wherein, few one of the quantity of inverter filtering branch road in the number ratio system of interconnection device, the interconnection device of this system can be all contactor or relay, and when system comprises multiple interconnection device, this interconnection device also can be that contactor and relay are used in combination.
In order to the structure of many level grid-connected inverters filtering system that the clearer the application of understanding provides, be described for two three level combining inverters, the structural representation of three level combining inverter filtering system as shown in Figure 3, this system comprises two inverter filtering branch roads 310 and 320 in parallel (for convenience of description, these two inverter filtering branch roads in parallel are called the first inverter filtering branch road 310 and the second inverter filtering device 320 by the present embodiment), wherein, the composition of each inverter filtering branch road is identical with the composition of the inverter filtering device branch road described by above-described embodiment, no longer repeat herein.
As shown in Figure 3, the direct current input positive and negative busbar DC in the first inverter filtering branch road 310
1+, DC
1-, input positive and negative busbar DC with the direct current in the second inverter filtering device 320
2+, DC
2-corresponding connection, i.e. DC
1+ with DC
2+ be connected, DC
1-with DC
2-be connected, and after the direct current of each inverter filtering branch road input positive and negative busbar is through the magnet ring of each self-corresponding common mode inductance, then is connected with the inversion bus of IGBT power device, the output of this IGBT power device is by the parallel connection of LC filter.Wherein, be provided with the bus capacitor of two series connection between this inversion bus, and the composition of other devices of this IGBT power device and structure thereof belong to general knowledge known in this field, the application is not described in detail in this.
In order to ensure the filter effect of EMI filter, the application links together after the magnet ring of the level line (the N line namely in Fig. 3) of bus capacitor through each self-corresponding common mode inductance again, thus make the direct current inlet highway in each inverter filtering branch road and N line run through the magnet ring of common mode inductance, so, in the practical application of this system, even if only have the work of an inverter filtering branch road and make the N line of bus capacitor there is non-vanishing electric current, also the magnet ring of common mode inductance can not be made saturated, thus avoid the impact of the filter effect on EMI filter.
It should be noted that, the many level grid-connected inverters filtering system provided for the application is not only applicable to the three level combining inverter shown in Fig. 3, equally also be applicable to five level grid-connected inverters etc., the similar shown in its structure and Fig. 3, the application is not described in detail in this.
In this specification, each embodiment adopts and to go forward one by one or mode arranged side by side describes, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. level grid-connected inverter filtering system more than a kind, it is characterized in that, described system comprises: the inverter filtering branch road of multiple parallel connection, described in each, inverter filtering branch road includes: the direct current inlet highway connected successively, EMI filter, IGBT power device and rear class filter, wherein:
The level line being arranged in multiple bus capacitors that described IGBT power device is connected in each inverter filtering branch road is in parallel after running through the EMI filter of place inverter filtering branch road, and described level line is the equipotential line of the points of common connection of two bus capacitors adjacent in multiple bus capacitors of described series connection;
The correspondence of the described direct current inlet highway in each inverter filtering branch road is extremely in parallel.
2. system according to claim 1, is characterized in that, described EMI filter comprises the common mode inductance be made up of at least one magnet ring.
3. system according to claim 2, is characterized in that, described EMI filter also comprises: the filter capacitor be connected with described common mode inductance output.
4. system according to claim 1, is characterized in that, described rear class filter is L-type filter, LC mode filter or LCL type filter.
5. the system according to any one of claim 1-4, it is characterized in that, described system also comprises: at least one interconnection device, then the level line of multiple bus capacitors of connecting in adjacent two inverter filtering branch roads is by being connected one by one with described interconnection device two ends after the EMI filter of place inverter filtering branch road;
Wherein, few one of the quantity of multiple grid-connected inverter filtering branch road described in the number ratio of described multiple interconnection device.
6. system according to claim 5, is characterized in that, described interconnection device is specially contactor or relay.
7. system according to claim 5, is characterized in that, when described interconnection device is multiple, described interconnection device comprises contactor and relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420515444.4U CN204168134U (en) | 2014-09-09 | 2014-09-09 | A kind of many level grid-connected inverters filtering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420515444.4U CN204168134U (en) | 2014-09-09 | 2014-09-09 | A kind of many level grid-connected inverters filtering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204168134U true CN204168134U (en) | 2015-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420515444.4U Expired - Lifetime CN204168134U (en) | 2014-09-09 | 2014-09-09 | A kind of many level grid-connected inverters filtering system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429470A (en) * | 2018-05-07 | 2018-08-21 | 天津瑞能电气有限公司 | One kind being based on direct current magnet ring multiple-variable flow device parallel connection circulation control method and system |
| CN113452305A (en) * | 2021-05-12 | 2021-09-28 | 武汉华海通用电气有限公司 | Frequency conversion speed regulation device with asynchronous motor and multiple common bus three-phase inverters connected in parallel |
| CN113635768A (en) * | 2021-09-15 | 2021-11-12 | 广州小鹏汽车科技有限公司 | Power system and vehicle |
| CN113937804A (en) * | 2020-07-13 | 2022-01-14 | 中国石油化工股份有限公司 | Cross-over converter of wind generating set and grid-connected control method thereof |
-
2014
- 2014-09-09 CN CN201420515444.4U patent/CN204168134U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429470A (en) * | 2018-05-07 | 2018-08-21 | 天津瑞能电气有限公司 | One kind being based on direct current magnet ring multiple-variable flow device parallel connection circulation control method and system |
| CN113937804A (en) * | 2020-07-13 | 2022-01-14 | 中国石油化工股份有限公司 | Cross-over converter of wind generating set and grid-connected control method thereof |
| CN113452305A (en) * | 2021-05-12 | 2021-09-28 | 武汉华海通用电气有限公司 | Frequency conversion speed regulation device with asynchronous motor and multiple common bus three-phase inverters connected in parallel |
| CN113635768A (en) * | 2021-09-15 | 2021-11-12 | 广州小鹏汽车科技有限公司 | Power system and vehicle |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20150218 |