CN202856630U - IGBT clamped three-level frequency converter - Google Patents
IGBT clamped three-level frequency converter Download PDFInfo
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- CN202856630U CN202856630U CN 201220537681 CN201220537681U CN202856630U CN 202856630 U CN202856630 U CN 202856630U CN 201220537681 CN201220537681 CN 201220537681 CN 201220537681 U CN201220537681 U CN 201220537681U CN 202856630 U CN202856630 U CN 202856630U
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Abstract
The utility model relates to an IGBT clamped three-level frequency converter and belongs to the frequency converter field. A main circuit of the IGBT clamped three-level converter is a three-phase six-leg frequency conversion circuit, wherein a first leg, a second leg, a third leg, a fourth led, a fifth leg and a sixth leg respectively comprise three switch elements, the first leg and the second leg are connected with an output circuit W phase, the third leg and the fourth leg are connected with an output circuit V phase, The fifth leg and the sixth leg are connected with an output circuit U phase, and the W phase, the V phase and the U phase are respectively provided with six freewheeling diodes and two series-connection energy storage capacitors. According to the IGBT clamped three-level frequency converter, current flows into or out of a central point of a direct current side capacitor when one output voltage of three-phase output voltages is zero, and voltages of up and down capacitors are unequal because of unequalness of the flow-in and flow-out current, a problem that central-point potential drift caused by unequal voltages influences on output voltage waveform quality is eliminated through connection and disconnection of the clamped IGBT.
Description
Technical field
The present invention relates to a kind of frequency converter, especially relate to a kind of three-level converter of IGBT clamper.
Background technology
The AC-DC-AC converter of extensive use in China's industrial system, the core of its inversion system is IGBT.Because the restriction of power electronic device technology, the device withstand voltage level is limited, and the high pressure IGBT of comparative maturity is withstand voltage can only to reach 3300V, the not yet formal commercialization of the IGBT of withstand voltage 6500V.High-voltage great-current device prevailing price is expensive, a withstand voltage upper grade often, and price has been turned over several times, has greatly increased installation cost.In the powerful application scenario of mesohigh.Consider the withstand voltage of device, electric current and cost, in order to obtain the power conversion of voltage levels, the traditional frequency conversion device can only lean on the connection in series-parallel of device to realize, and the connection in series-parallel meeting brings quiet, dynamic voltage balancing, the current-sharing of switching device and drive the series of problems such as signal is synchronous, greatly increase the complexity of system, reduced the reliability of system.
The high-power of two level converters also has a lot of new problems, such as larger du/dt and di/dt to the very large insulating requirements that improves load of the impact of device and motor.The research of electromagnetic interference, electromagnetic compatibility, shaft voltage, shaft current and long line transmission problem all is in the starting stage, and this has great impact to the Systems balanth reliability.
Summary of the invention
The object of the invention is to, a kind of new technical scheme is provided, this technical scheme is by forming the inverter circuit that many level outputs can be provided with a plurality of power devices by certain topological structure, its main purpose is to export to approach desirable sinusoidal waveform with three level, thereby weakens the harmonic effects in the output waveform.When obtaining the high input voltage output characteristic, the multi-level frequency conversion device has also alleviated the high pressure stress on the device, can use the device configuration high-vol of low voltage grade, has solved the problem that the device connection in series-parallel brings, and has reduced the integrated cost of system.
Technical scheme of the present invention is achieved by following technical measures.The three-level converter of IGBT clamper of the present invention, it is characterized in that: the main circuit of this frequency converter is three-phase six brachium pontis frequency changer circuits, the first brachium pontis, the second brachium pontis, the 3rd brachium pontis, the 4th brachium pontis, the 5th brachium pontis, the 6th brachium pontis include 3 switch elements, wherein, the first brachium pontis, the second brachium pontis connect output circuit W phase, the 3rd brachium pontis, the 4th brachium pontis connect output circuit V phase, the 5th brachium pontis, the 6th brachium pontis connect output circuit U phase, and described W phase, V phase, U phase brachium pontis are provided with 6 fly-wheel diodes and two storage capacitors that are connected in series.
The special feature of the three-level converter of IGBT clamper of the present invention also is: described frequency converter is the 1140V frequency converter.
Beneficial effect of the present invention is achieved by abovementioned technology.The three-level converter of IGBT clamper of the present invention, each phase brachium pontis of this circuit has six switch elements, 6 fly-wheel diodes, and the mid point of two series connection devices is connected by the mid point of clamper IGBT and dc bus capacitor.The effect of clamper IGBT is to provide current channel to prevent capacitance short-circuit when the switching tube conducting.It is half of DC side busbar voltage that average each supervisor bears forward blocking voltage, compares with two traditional level topological structures, and the three-level NPC inverter major advantage is that device has 2 times forward blocking voltage ability; Can reduce harmonic wave and effectively reduce switching frequency, thereby make system loss little, weigh as reach same output performance index from switching frequency, the switching frequency of three level will be 1/5 of two level; And its voltage build-up rate (du/dt) reduces half than two level general inverters, pollutes the current-rising-rate (di of electric property
Dt) also reduce thereupon, can obviously reduce the insulation property of infringement motor and prolong its working life; Along with level number increases, each level magnitude relative reduce, change in voltage reduces, and the ripple component that main circuit current contains is little, and torque pulsation and electromagnetic noise reduce; If three-level inverter connects the star load of the unsettled three-phase symmetrical of mid point, then will not have 3 multiple subharmonic current in the load and flow through.
This shows that compared with prior art, the three-level converter of IGBT clamper of the present invention has the following advantages:
(1) each switching device dc voltage value of bearing is reduced to half of dc voltage value; The improved switching frequency that reduced simultaneously of waveform quality;
(2) voltage build-up rate du/dt is reduced to half of two level current transformers;
(3) increasing of output-voltage levels number, the relative amplitude of each level reduces, and change in voltage reduces, and current pulsation reduces, and has reduced electromagnetic interference;
(4) turning on and off by clamper IGBT, having eliminated has electric current to flow into when certain phase output voltage is zero in the three-phase output voltage or outflow dc bus capacitor mid point, causing up and down when inflow and outflow electric current are unequal, capacitance voltage does not wait, midpoint potential drifts about, and affects the problem of output voltage waveforms quality;
(5) same interior two pipe break-make frequencies of IGBT are identical on the same brachium pontis.
Therefore, the present invention has outstanding substantive distinguishing features and significant technological progress, and the beneficial effect of its enforcement also is apparent.
Description of drawings
Below in conjunction with accompanying drawing, the specific embodiment of the invention is described further.
Fig. 1 is the three-level converter circuit diagram of IGBT clamper of the present invention.
Fig. 2 is the W phase P view of Fig. 1.
Fig. 3 is W phase 0 view of Fig. 1.
Fig. 4 is the W phase N view of Fig. 1.
Embodiment
For clearly demonstrating the technical characterstic of this programme, below by an embodiment, and in conjunction with its accompanying drawing, this programme is set forth.
Can find out by accompanying drawing 1, the three-level converter main circuit of IGBT clamper of the present invention is three-phase six brachium pontis frequency changer circuits, the first brachium pontis, the second brachium pontis, the 3rd brachium pontis, the 4th brachium pontis, the 5th brachium pontis, the 6th brachium pontis include 3 switch elements, wherein, the first brachium pontis, the second brachium pontis connect output circuit W phase, the 3rd brachium pontis, the 4th brachium pontis connect output circuit V phase, the 5th brachium pontis, the 6th brachium pontis connect output circuit U phase, and described W phase, V phase, U phase brachium pontis are provided with 6 fly-wheel diodes and two storage capacitors that are connected in series.
The three-level converter of IGBT clamper of the present invention, Working state analysis is as follows: each brachium pontis of IGBT neutral-point-clamped three-level converter has 6 switch elements, mutually as example, is U1 ~ U6 take W.Three normal switching modes are arranged, and when U1, U5 conducting, W is output as positive level mutually; When U2, U5 or U3, U6 conducting, W is output as zero level mutually; When U4, U6 conducting, W is output as negative level mutually.Mutually as example, all the other V phases, U phase working condition are mutually identical with W, can divide following three kinds of operating states take W:
| On off state | U1 | U2 | U3 | | U5 | U6 | |
| 1 | ON | OFF | OFF | OFF | ON | OFF | |
| 0 | OFF | ON/OFF | OFF/ON | OFF | ON/OFF | OFF/ON | |
| -1 | OFF | OFF | OFF | ON | OFF | ON |
(1) P state, i.e. U1, U5 conducting, and all the other IGBT turn-off.Represent with " l " during mathematical operation.Be that the P utmost point and W are connected, as shown in Figure 2.
(2) O state, i.e. U2, U5 conducting (perhaps U3, U6 conducting), and all the other IGBT turn-off.Represent with " 0 " during mathematical operation.The O utmost point is connected with W, as shown in Figure 3.
(3) N state, the U4/U6 conducting, and all the other IGBT turn-off.Represent with " 1 " during mathematical operation.The N utmost point is linked to each other with W, as shown in Figure 4.
When changing between the adjacent states certain time interval is arranged, be referred to as Dead Time (Dead Time), namely the process from the P state to the O state is: turn-off first Ul, and Ul cut-off behind one section Dead Time, and then open U2; Process from the O state to the N state is: turn-off first U3, U4 is opened in the U3 cut-off again behind one section Dead Time.The N state is similar to the above to the conversion of O state, O state and P state.If just open U2 when Ul is not turned off fully, then U1, U2 series connection is straight-through, and the P utmost point and the O utmost point cause IGBT to damage by U1, U2 direct short-circuit.So in the triggering control of switching device, certain Dead Time interval is necessary.
[0021] it should be noted that simultaneously the conversion between these three kinds of states can only carry out between P state and O state, O state and N state.Never allow directly conversion between P state and N state, otherwise in Dead Time, mutually four easily simultaneously connections of switches, thus with the dc bus short circuit, its consequence is with hardly imaginable.Simultaneously, operation also can increase on-off times like this, causes the increase of switching loss.So the conversion between P state and the N state must be take O as transition.
Claims (2)
1. the three-level converter of an IGBT clamper, it is characterized in that: the main circuit of this frequency converter is three-phase six brachium pontis frequency changer circuits, the first brachium pontis, the second brachium pontis, the 3rd brachium pontis, the 4th brachium pontis, the 5th brachium pontis, the 6th brachium pontis include 3 switch elements (IGBT), wherein, the first brachium pontis, the second brachium pontis connect output circuit W phase, the 3rd brachium pontis, the 4th brachium pontis connect output circuit V phase, the 5th brachium pontis, the 6th brachium pontis connect output circuit U phase, and described W phase, V phase, U phase brachium pontis are provided with 6 fly-wheel diodes and two storage capacitors that are connected in series.
2. the three-level converter of a kind of IGBT clamper according to claim 1, it is characterized in that: described frequency converter is the 1140V three-level converter, the frequency converter neutral point adopts the IGBT clamper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220537681 CN202856630U (en) | 2012-10-21 | 2012-10-21 | IGBT clamped three-level frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220537681 CN202856630U (en) | 2012-10-21 | 2012-10-21 | IGBT clamped three-level frequency converter |
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| CN202856630U true CN202856630U (en) | 2013-04-03 |
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| CN 201220537681 Expired - Fee Related CN202856630U (en) | 2012-10-21 | 2012-10-21 | IGBT clamped three-level frequency converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857120A (en) * | 2012-10-21 | 2013-01-02 | 山东博诚机电有限公司 | Insulated gate bipolar translator (IGBT) clamping three-level frequency converter |
| WO2015007569A1 (en) * | 2013-07-17 | 2015-01-22 | Siemens Aktiengesellschaft | Active-neutral point converter |
| EP3046248A1 (en) * | 2014-11-17 | 2016-07-20 | GE Energy Power Conversion Technology Ltd | Modular embedded multi-level converter and method of use |
-
2012
- 2012-10-21 CN CN 201220537681 patent/CN202856630U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857120A (en) * | 2012-10-21 | 2013-01-02 | 山东博诚机电有限公司 | Insulated gate bipolar translator (IGBT) clamping three-level frequency converter |
| WO2015007569A1 (en) * | 2013-07-17 | 2015-01-22 | Siemens Aktiengesellschaft | Active-neutral point converter |
| CN105409101A (en) * | 2013-07-17 | 2016-03-16 | 西门子公司 | Active-neutral point converter |
| US9929677B2 (en) | 2013-07-17 | 2018-03-27 | Siemens Aktiengellschaft | Three-level active neutral point converter |
| CN105409101B (en) * | 2013-07-17 | 2018-06-01 | 西门子公司 | Three-level rectifier |
| EP3046248A1 (en) * | 2014-11-17 | 2016-07-20 | GE Energy Power Conversion Technology Ltd | Modular embedded multi-level converter and method of use |
| US9515574B2 (en) | 2014-11-17 | 2016-12-06 | General Electric Company | Modular embedded multi-level converter with midpoint balancing |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANDONG BOCHENG ELECTRIC CO., LTD. Free format text: FORMER OWNER: SHANDONG BOCHENG MECHANICAL AND ELECTRICAL CO., LTD. Effective date: 20141225 |
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Effective date of registration: 20141225 Address after: 273100, 6 Industrial Park, Wu Town, Jining, Shandong, Qufu Patentee after: SHANDONG BOCHENG ELECTRIC CO., LTD. Address before: 273100 Shandong city of Jining province Qufu City Wu Village Station South 104 National Road West Patentee before: Shandong Bocheng Electrical Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20191021 |
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| CF01 | Termination of patent right due to non-payment of annual fee |