CN102655379A - Device used for restraining circumfluence in inverter parallel operation system - Google Patents
Device used for restraining circumfluence in inverter parallel operation system Download PDFInfo
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- CN102655379A CN102655379A CN2011100488859A CN201110048885A CN102655379A CN 102655379 A CN102655379 A CN 102655379A CN 2011100488859 A CN2011100488859 A CN 2011100488859A CN 201110048885 A CN201110048885 A CN 201110048885A CN 102655379 A CN102655379 A CN 102655379A
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- inverter
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- inductance
- branch road
- inverter parallel
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Abstract
The invention discloses a device used for restraining circumfluence in an inverter parallel operation system. The device comprises a filtering capacitor and a coupling inductor. The device provided by the invention has the advantages that a whole circuit is free from a direct current circumfluence channel, thereby basically solving a direct current circumfluence restraining problem, and realizing load flow equalization; and the volume of an electric reactor is reduced, and the control can be realized simply.
Description
Technical field
The present invention relates to big capacity DC-to-AC converter, design a kind of device that suppresses circulation in the inverter parallel system especially, this device can automatic current equalizing, suppress circulation, realizes a plurality of inverter parallels, enlarges the inverter capacity.
Background technology
Inverter parallel is the reliability and the important technical that enlarges power supply capacity that improves the inverter electric power system.The development trend of current big capacity inverter is to utilize the advantage of novel full control high frequency switching device, reduces the volume of system, reduces the dynamic responding speed of noise, raising system; Utilize parallel technology simultaneously, improve the versatility and the flexibility of inverter, inverter can be designed as unified specification, and only to the requirement of different user, adopts one or more inverter parallel connection.So just reduced different capabilities inverter particularly big capacity Design of Inverter cost and overlapping investment, made system design, installation and combination convenient, reliability is further improved.Yet inverter parallel must guarantee that output voltage amplitude, frequency, phase place, waveform and the phase sequence of each inverter is consistent, and the less difference of these parameters all can produce bigger circulation at each intermodule, makes each module of inverter can not load-sharing.Suppressing inductance at each module output series connection circulation of shunt chopper is a kind of important method that addresses this problem, but common inductance is when suppressing circulation, and the pressure drop on the inductance has reduced the steady state voltage precision of parallel system.Coupling inductance utilizes the coupling between the inductance not only can better suppress circulation, can also eliminate the influence of inductance to parallel system steady state voltage precision, the load-sharing electric current.Utilize filter capacitor simultaneously, blocking-up dc loop-current path has fundamentally suppressed dc loop-current.This device has the advantage that circuit structure is simple and easy to realize.
Fig. 1 uses circulation to suppress inductance 3,4 inhibition circulation, and there is circulation flow path in electric capacity 5 filtering in the circuit, need to use circulation to suppress inductance, and the pressure drop on the inductance has reduced the steady state voltage precision of parallel system.
Fig. 2 uses coupling inductance to replace 3,4 to replace the circulation among Fig. 1 to suppress inductance; Do the volume that has reduced circulation inhibition inductance like this; The load current on two branch roads can be divided equally simultaneously in the parallel system, the influence of inductance can also be eliminated parallel system steady state voltage precision.
Fig. 3 is transformed into 5 among Fig. 3 and 6 with the electric capacity among Fig. 25, and the beneficial effect of doing like this is exactly in filtering, utilizes the logical characteristic that exchanges stopping direct current of electric capacity to block the dc loop-current in the parallel system.
Fig. 4 has utilized among Fig. 3 beneficial effect and coupling inductance has been carried out two-stage series connection, can realize 4 inverter parallel connections, and can suppress the circulation in the parallel running system.
Summary of the invention
1, technical problem: the technical problem that the present invention will solve be when suppressing the inverter parallel connection circulation between the module with divide equally the load current of each module, realize a plurality of inverters parallel connections.
2, technical scheme: in order to solve above-mentioned technical problem; Inverter of the present invention comprises the electric capacity of DC side, also comprises the full-bridge circuit of parallel connection, and the anode of last brachium pontis is connected with the output of power circuit; The negative electrode of last brachium pontis is connected with the anode of following brachium pontis; And be connected with coupling inductance through filter capacitor, the identical brachium pontis of a parallel connection of other end connection of coupling inductance, these two brachium pontis are connected to the different name end of coupling inductance.
The present invention adopts the device that suppresses circulation in the inverter parallel system to comprise filter capacitor and coupling inductance, the inverter of its input side joint parallel connection, and its starting point is circulation and the load-sharing electric current that suppresses in the parallel system.Its basic thought is that filter capacitor is placed on parallel connected end, utilizes the logical characteristics that exchange stopping direct current of electric capacity fundamentally to suppress dc loop-current; Simultaneously traditional circulation is suppressed inductance and be transformed into coupling inductance, utilize coupling inductance to realize filtering, suppress circulation, and utilize its electromagnetic property to realize current-sharing, guarantee that the load current on every branch road equates.
3, beneficial effect: advantage of the present invention is: (1) electric capacity has suppressed the circulation of parallel system, no longer needs circulation to suppress controlling unit, has simplified control algolithm; (2) coupling inductance can realize automatically that load current divides equally; (3) utilize coupling inductance can reduce the inductance volume, eliminate the influence of inductance parallel system steady state voltage precision.
Embodiment
Present embodiment
The device that suppresses circulation in the inverter parallel systemComprise filter capacitor and coupling inductance; Full-bridge circuit in the inverter parallel system; The anode of last brachium pontis is connected with the output of DC side, and the negative electrode of last brachium pontis is connected with the anode of following brachium pontis, and is connected with coupling inductance through filter capacitor; The other end of coupling inductance connects the identical brachium pontis of a parallel connection, and these two brachium pontis are connected to the different name end of coupling inductance.
Following mask body is introduced two inverter parallel connection scenario-frames and principle thereof
The device that suppresses circulation in the inverter parallel systemAdopted a kind of coupling inductance with transformer device structure.The inductance coil equal turn numbers of every branch road on public iron core, is equivalent to no-load voltage ratio and is the former secondary of 1 transformer.Electric current
,
flow out from non-same polarity from the inductance coil of two inverters through two branch roads; In iron core, produce magnetic flux in the opposite direction, shown in a among Fig. 3 and b.Coupling inductance is through electromagnetic coupled load-sharing electric current automatically, helps prolonging inverter useful life.
When each module of inverter was normally moved and be synchronous fully, coupling inductance presented very little transformer leakage impedance, can not bring extra impedance to the loop.Through the inductive reaction between the coupling inductance, realize the automatic current equalizing of many branch roads, thereby realize the parallel connection automatically of a plurality of inverters that the capacity of each inverter has only 1/2nd of system requirements capacity.
When separate unit inversion failure and other reasons causes when having only the work of inverter, be equivalent to the transformer open circuit operation, transformer presents excitation reactance, than high 2 ~ 3 one magnitude of leakage reactance, the effectively electric current of constraint generator.
When two inverters move when inconsistent, the voltage magnitude of two module outputs is with phase place when inequality, can generation circulation between each module, and the coupling inductance of series connection and electric capacity can effectively suppress circulation.Wherein electric capacity can stop the path of dc loop-current fully.
When two inverters move when inconsistent, the voltage magnitude of two module outputs can generation circulation between each module with phase place when inequality.If the equivalent output impedance of two inverters is respectively
;
; If
,
are respectively each module output current;
is total offset current; Its reference direction is as shown in Figure 3; Definition
,
are the circulation in the parallelly connected module, then have:
According to Kirchhoff's current law (KCL):
.Then
; Wherein
,
distinguish the output voltage of parallelly connected filter capacitor, and the voltage on the busbar is
.This shows that coupling inductance can effectively suppress circulation.Electric capacity can stop the path of dc loop-current fully simultaneously.
Embodiment
Among Fig. 3, around left coupled inductor 3, the right coupled inductor 4 of two equal turn numbers, be the structure of a similar single-phase transformer on employing " mouth " shaped iron core; Offset current flows into from the non-same polarity of coil, and the magnetic flux a, the b that make left branch current
, right branch current
in iron core, produce are in the opposite direction.
Adopt 3 coupling inductances among Fig. 4 like two branch roads containing among Fig. 3.Three coupling inductances constitute the two-stage series connection structure makes loop current be divided into four branch roads.
The first order is like two branch road coupling inductances of " mouth " shaped iron core that contains among Fig. 3, is divided into two branch roads to system power; Adopt like the parallel-type converter among Fig. 3 in above-mentioned each bar branch road the second level.The effect of coupling inductance was identical when the effect of each grade coupled inductance was parallelly connected with aforementioned two inverters, played the effect of automatic current equalizing or current limliting, realized four inverter parallels.
Claims (4)
1. device that suppresses circulation in the inverter parallel system; Constitute by filter capacitor and inductance coil; It is characterized in that: said inductance coil constitutes coupled inductor on common core; The inductance coil equal turn numbers of each bar branch road, filter capacitor are serially connected between inductance coil and the inverter, and the magnetic flux that the inductance coil of each bar branch road and the inductance coil of other branch roads produce in each magnetic circuit of iron core is opposite in twos; Said inverter parallel system is 2 of separating or 4 inverter parallel connections or 2 or 4 inverter parallel connections using same controller.
2. a kind of device that suppresses circulation in the inverter parallel system as claimed in claim 1; It is characterized in that: it is composed in parallel by 2 branch roads; The inductance coil of every branch road is on public " mouth " shaped iron core; Be equivalent to the former secondary of no-load voltage ratio for the transformer of " 1 ", 2 inverters are connected the non-same polarity of inductance coil.
3. a kind of device that suppresses circulation in the inverter parallel system as claimed in claim 1; It is characterized in that: it is made up of two-stage series connection; The first order is composed in parallel by 2 branch roads; The inductance coil of every branch road is equivalent to no-load voltage ratio and is the former secondary of 1 transformer on public " mouth " shaped iron core, be divided into two branch roads by the non-same polarity of two inductance coils and get into the second level; Every the route 2 strip branch roads in the second level compose in parallel; Totally 4 from branch road; The inductance coil of every strip branch road is on public " mouth " shaped iron core; Be equivalent to no-load voltage ratio and be the former secondary of 1 transformer, the non-same polarity of two sub-branch roads of every branch road connects an inverter respectively, realizes 4 inverter parallel connections.
4. a kind of device that suppresses circulation in the inverter parallel system as claimed in claim 1, it is characterized in that: said filter capacitor is serially connected between inverter and the inductance coil, is used to suppress dc loop-current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011100488859A CN102655379A (en) | 2011-03-01 | 2011-03-01 | Device used for restraining circumfluence in inverter parallel operation system |
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| CN2011100488859A CN102655379A (en) | 2011-03-01 | 2011-03-01 | Device used for restraining circumfluence in inverter parallel operation system |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475248A (en) * | 2013-08-30 | 2013-12-25 | 华为技术有限公司 | Power conversion circuit and power conversion system |
| CN104079195A (en) * | 2014-06-30 | 2014-10-01 | 华为技术有限公司 | Power conversion circuit and power conversion system |
| CN105119475A (en) * | 2015-08-31 | 2015-12-02 | 天津大学 | Inverter with coupling inductor and method of restraining impulse current of bridge arm |
| TWI514730B (en) * | 2014-06-16 | 2015-12-21 | Univ Nat Taipei Technology | Ultra high step-down converter |
| CN106208344A (en) * | 2015-04-30 | 2016-12-07 | 艾默生网络能源有限公司 | A kind of uninterrupted power source |
| US9787217B2 (en) | 2013-08-30 | 2017-10-10 | Huawei Technologies Co., Ltd. | Power conversion circuit and power conversion system |
| CN108233754A (en) * | 2018-02-02 | 2018-06-29 | 青岛云路聚能电气有限公司 | A kind of gird-connected inverter |
| CN110176866A (en) * | 2019-04-11 | 2019-08-27 | 华中科技大学 | A kind of 2N inverter parallel system and its control method |
| CN110868050A (en) * | 2019-12-14 | 2020-03-06 | 大连海事大学 | Dynamic current-sharing control circuit of parallel IGBT |
| EP3761500A1 (en) * | 2019-07-04 | 2021-01-06 | Siemens Aktiengesellschaft | Galvanically isolated single-phase or multi-phase power converter |
| CN112564536A (en) * | 2021-02-20 | 2021-03-26 | 深圳英飞源技术有限公司 | Wave-by-wave current limiting control method and device of inverter circuit |
| CN113037118A (en) * | 2021-03-04 | 2021-06-25 | 北京润科通用技术有限公司 | Multi-bridge-arm parallel current-sharing circuit and control method and device thereof |
| US11677332B2 (en) | 2017-10-24 | 2023-06-13 | Huawei Technologies Co., Ltd. | Inverter current equalization method and apparatus, inverter system, and wireless charging system |
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| CN1365180A (en) * | 2000-08-31 | 2002-08-21 | 台达电子工业股份有限公司 | Soft switching whole bridge connection circuit converter |
| CN1518220A (en) * | 2003-01-13 | 2004-08-04 | 汤姆森特许公司 | Band-pass filter of changable and tunable with optimum frequency response |
| US20090046482A1 (en) * | 2007-08-13 | 2009-02-19 | Stephen William Smith | Phase shifted H-Bridge resonant converter with symmetrical currents |
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Patent Citations (3)
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| CN1365180A (en) * | 2000-08-31 | 2002-08-21 | 台达电子工业股份有限公司 | Soft switching whole bridge connection circuit converter |
| CN1518220A (en) * | 2003-01-13 | 2004-08-04 | 汤姆森特许公司 | Band-pass filter of changable and tunable with optimum frequency response |
| US20090046482A1 (en) * | 2007-08-13 | 2009-02-19 | Stephen William Smith | Phase shifted H-Bridge resonant converter with symmetrical currents |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9787217B2 (en) | 2013-08-30 | 2017-10-10 | Huawei Technologies Co., Ltd. | Power conversion circuit and power conversion system |
| CN103475248A (en) * | 2013-08-30 | 2013-12-25 | 华为技术有限公司 | Power conversion circuit and power conversion system |
| CN103475248B (en) * | 2013-08-30 | 2016-12-07 | 华为技术有限公司 | Power conversion circuit and power conversion system |
| TWI514730B (en) * | 2014-06-16 | 2015-12-21 | Univ Nat Taipei Technology | Ultra high step-down converter |
| CN104079195A (en) * | 2014-06-30 | 2014-10-01 | 华为技术有限公司 | Power conversion circuit and power conversion system |
| CN104079195B (en) * | 2014-06-30 | 2017-01-25 | 华为技术有限公司 | Power conversion circuit and power conversion system |
| CN106208344A (en) * | 2015-04-30 | 2016-12-07 | 艾默生网络能源有限公司 | A kind of uninterrupted power source |
| CN105119475B (en) * | 2015-08-31 | 2017-10-24 | 天津大学 | A kind of method of inverter and suppression bridge arm dash current with coupling inductance |
| CN105119475A (en) * | 2015-08-31 | 2015-12-02 | 天津大学 | Inverter with coupling inductor and method of restraining impulse current of bridge arm |
| US11677332B2 (en) | 2017-10-24 | 2023-06-13 | Huawei Technologies Co., Ltd. | Inverter current equalization method and apparatus, inverter system, and wireless charging system |
| CN108233754A (en) * | 2018-02-02 | 2018-06-29 | 青岛云路聚能电气有限公司 | A kind of gird-connected inverter |
| CN110176866A (en) * | 2019-04-11 | 2019-08-27 | 华中科技大学 | A kind of 2N inverter parallel system and its control method |
| EP3761500A1 (en) * | 2019-07-04 | 2021-01-06 | Siemens Aktiengesellschaft | Galvanically isolated single-phase or multi-phase power converter |
| WO2021001116A1 (en) * | 2019-07-04 | 2021-01-07 | Siemens Aktiengesellschaft | Galvanically isolated single-phase or multi-phase power converter |
| CN110868050A (en) * | 2019-12-14 | 2020-03-06 | 大连海事大学 | Dynamic current-sharing control circuit of parallel IGBT |
| CN112564536A (en) * | 2021-02-20 | 2021-03-26 | 深圳英飞源技术有限公司 | Wave-by-wave current limiting control method and device of inverter circuit |
| CN112564536B (en) * | 2021-02-20 | 2021-05-14 | 深圳英飞源技术有限公司 | Wave-by-wave current limiting control method and device of inverter circuit |
| CN113037118A (en) * | 2021-03-04 | 2021-06-25 | 北京润科通用技术有限公司 | Multi-bridge-arm parallel current-sharing circuit and control method and device thereof |
| CN113037118B (en) * | 2021-03-04 | 2022-08-19 | 北京润科通用技术有限公司 | Multi-bridge-arm parallel current-sharing circuit and control method and device thereof |
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Application publication date: 20120905 |