CN102801348A - Three-phase five-level inverter - Google Patents
Three-phase five-level inverter Download PDFInfo
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- CN102801348A CN102801348A CN2012101912388A CN201210191238A CN102801348A CN 102801348 A CN102801348 A CN 102801348A CN 2012101912388 A CN2012101912388 A CN 2012101912388A CN 201210191238 A CN201210191238 A CN 201210191238A CN 102801348 A CN102801348 A CN 102801348A
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Abstract
The invention discloses a three-phase five-level inverter. Each phase of the inverter comprises a power supply circuit, a clamping circuit and an H bridge circuit, wherein the power supply circuit comprises two individual rectifying bridges; each rectifying bridge comprises three input ends connected with three-phase alternating-current power, so that the three-phase alternating-current power is converted into direct-current voltage; the clamping circuit comprises a clamping switch and four clamping diodes; each two clamping diodes are connected in series and then are connected in parallel between a collector and a transmitter of the clamping switch; the middle centers of the mutually serial-connected clamping diodes are respectively connected with the two rectifying bridges and the H bridge circuit; the H bridge circuit comprises a left half bridge and a right half bridge; each of the left half bridge and the right half bridge comprises two serial-connected clamping switches connected between the two rectifying bridges; the middle point of the two clamping switches of the left half bridge is connected with the clamping circuit; and the middle point of the two clamping switches of the right half bridge is used as a three-phase output. With the adoption of the three-phase five-level inverter provided by the invention, the effect can be achieved by fewer elements when being compared with the existing three-phase five-level inverter, which achieves the effect by using a lot of conventional elements.
Description
Technical field
The present invention relates to a kind of multi-electrical level inverter, particularly relate to a kind of three-phase five-electrical level inverter, relate to the Technics of Power Electronic Conversion device.
Background technology
Through ten years development, multi-level converter has obtained relatively more successful application in many aspects.Reactive power compensation in the electric power system and high-voltage frequency conversion and speed-adjusting are the main application fields of multi-level converter.Multi-level converter generally is applied to the high-power occasion, and the electric pressure that it not only can improve frequency converter mainly is the harmonic content that reduces frequency converter output, reduces switching loss, improves the power factor of equipment etc.
As previously mentioned, multi-level converter has power big (MW level), the low advantage of output harmonic wave, but often needs a lot of switch elements and passive device.For example for five-level converter, the number of switches that conventional diode clamp type needs is 8, and number of diodes is 14; Electric capacity quantity is 4, and the independent DC power supply number is 1, and the number of switches that traditional striding capacitance type needs is 8; Number of diodes is 8; Electric capacity quantity is 4, and the independent DC power supply number is 1, and table 1 item is the comparative result of several kinds of different five-level converter topological structures in the prior art:
Table 1
Yet nowadays, large power semiconductor device has reached 6.5kV and 2.5kA, makes people more pay close attention to and uses less device to reach the effect of traditional many level topologys.
Summary of the invention
For overcoming the deficiency that above-mentioned prior art exists, the present invention's purpose is to provide a kind of three-phase five-electrical level inverter, and it can use less elements to reach the effect that a lot of in the past elements just can reach.
For reaching above-mentioned and other purpose, the present invention provides a kind of three-phase five-electrical level inverter, and each of this inverter includes mutually:
Power supply circuits comprise two independently rectifier bridges, and each rectifier bridge comprises three input termination three-phase alternating currents, to be used for converting three-phase alternating current into direct voltage;
Clamp circuit comprises a clamp switch and four clamp diodes, is connected between the collector electrode and emitter of this clamp switch after per two clamp diodes series connection, and the mid point of the clamp diode of series connection is connected to two rectifier bridges and H bridge circuit respectively each other; And
The H bridge circuit comprises left half-bridge and right half-bridge, and left and right sides half-bridge respectively comprises two series connection and is connected to two clamp switch between the rectifier bridge, and two clamp switch mid points of left half-bridge are connected with this clamp circuit, and two clamp switch mid points of right half-bridge are exported as three-phase;
Wherein, the left half-bridge mid point of each phase links to each other.
Further, each rectifier bridge comprises six diodes, parallel connection after per two diodes are connected each other, and two diode intermediate nodes of series connection connect three-phase alternating current each other.
Further, these power supply circuits also comprise two filter capacitors, and these two filter capacitors are connected in series between these two rectifier bridges.
Further, the mid point of these two filter capacitors is connected in the mid point of two clamp diodes of this clamp circuit.
Further, two clamp switch collector electrodes of the mutual series connection of this H bridge circuit connect two rectifier bridges respectively, and emitter links to each other.
Further, be connected a clamp diode between the collector electrode of each clamp switch of this H bridge circuit and the emitter, this clamp diode anode connects the emitter of clamp switch, and negative electrode connects the collector electrode of clamp switch.
Further, this clamp switch is IGBT.
Compared with prior art; A kind of three-phase five-electrical level inverter of the present invention is formed H bridge five level through adopting three level A-NPC (mid point clamper) and right half-bridge; Compare with traditional five-electrical level inverter, the present invention has advantages such as switching device is few, inverter losses is few, cost is low, the output harmonic wave distortion is little.
Description of drawings
Fig. 1 is the topology diagram of the preferred embodiment of a kind of three-phase five-electrical level inverter of the present invention;
Fig. 2 is the circuit diagram of single-phase five level operation modes in the preferred embodiment of the present invention;
Fig. 3 is the three-phase nine level oscillograms that produce according to Fig. 2.
Embodiment
Below through specific instantiation and accompanying drawings execution mode of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by the content that this specification disclosed.The present invention also can implement or use through other different instantiation, and each item details in this specification also can be based on different viewpoints and application, carries out various modifications and change under the spirit of the present invention not deviating from.
Fig. 1 is the topology diagram of the preferred embodiment of a kind of three-phase five-electrical level inverter of the present invention.As shown in Figure 1, a kind of three-phase five-electrical level inverter of the present invention, its each comprise mutually: power supply circuits 101, clamp circuit 102 and H bridge circuit 103.
Wherein power supply circuits 101 comprise two independently rectifier bridges, each rectifier bridge one termination H bridge circuit 103, another termination clamp circuit 102; Each rectifier bridge comprises six diodes; Parallel connection after per two diodes are connected each other, two diode intermediate nodes of series connection connect the three-phase alternating current of 380V each other, and are preferable; Power supply circuits 101 also comprise two filter capacitor E1/E2, and two filter capacitors are connected in series between two rectifier bridges; Clamp circuit 102 comprises a clamp switch S15 (S25 or S35) and four clamping diode D1/D2/D3/D4; Be connected between the collector electrode and emitter of clamp switch S15 after wherein clamp diode D1/D2, clamp diode D3/D4 connect respectively; The mid point of clamp diode D1/D2 links to each other with the mid point of filter capacitor E1/E2; Preferable, clamp switch S15 is an IGBT pipe (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor); The H bridge circuit comprises four clamp switch S11/S12/S21/S22 (S31/S32/S41/S42 or S51/S52/S61/S62), and wherein clamp switch S11/S12 is left half-bridge, and clamp switch S21/S22 is right half-bridge; Clamp switch S11 and S12, clamp switch S21 and S22 are connected in series in respectively between two rectifier bridges; The mid point of left side half-bridge is connected with the mid point of clamp diode D3/D4, and the left half-bridge mid point of each phase links to each other, and right half-bridge mid point is as U, V, the output of W three-phase; Preferable; Also be connected a clamp diode between the collector electrode of each clamp switch and the emitter, each clamp diode anode connects the emitter of clamp switch, and negative electrode connects the collector electrode of clamp switch; In preferred embodiment of the present invention, clamp switch is IGBT.It is thus clear that; IGBT in the preferred embodiment of the present invention is subdivided into a plurality of level with the DC bus-bar voltage of diode clamp formula inverter through two capacitor dividing potential drops of connecting, and the voltage that single switching transistor bears on the inverter is the dividing potential drop of a certain electric capacity in the series capacitor bank.
Fig. 2 is the circuit diagram of single-phase five level operation modes in the preferred embodiment of the present invention.Below will cooperate Fig. 2 to further specify the present invention's principle.As shown in Figure 2, the dc bus capacitor of single-phase inverter equates, Vdc=2E.As shown in Figure 2, left half-bridge output E, right half-bridge output-E, UAB=+2E.As shown in Figure 2, left half-bridge output 0V, right half-bridge output-E, UAB=+E.As shown in Figure 2, left and right sides half-bridge is exported 0V simultaneously.As shown in Figure 2, left half-bridge output 0V, right half-bridge output+E, UAB=-E.As shown in Figure 2, left half-bridge output-E, right half-bridge output+E, UAB=-2E.Like this UAB just can export+2E, E, 0 ,-E ,-five level of 2E.So, three-phase line voltage then can reach nine level.
Fig. 3 is the three-phase nine level oscillograms that produce according to Fig. 2.Can see that from Fig. 3 nine level (line voltage) output PWM (pulse width modulation) waveform of output and the voltage that inverter is exported are step and stagger step by step; The present invention has realized high-quality power output, has reduced the impact of output voltage du/dt to motor windings.
Table 2 is the comparative result of the five-electrical level inverter topological structure of the present invention and prior art:
Table 2
It is thus clear that; A kind of three-phase five-electrical level inverter of the present invention is formed H bridge five level through adopting three level A-NPC (mid point clamper) and right half-bridge; Compare with five traditional level topological structures, the present invention has advantages such as switching device is few, inverter losses is few, cost is low, the output harmonic wave distortion is little.Therefore, the present invention has a wide range of applications, and presses (typical 6000v), little, the high-power occasion of harmonic content in especially being fit to, and stronger economy and novelty are arranged.
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any those skilled in the art all can be under spirit of the present invention and category, and the foregoing description is modified and changed.Therefore, rights protection scope of the present invention should be listed like claims.
Claims (7)
1. three-phase five-electrical level inverter is characterized in that each of this inverter includes mutually:
Power supply circuits comprise two independently rectifier bridges, and each rectifier bridge comprises three input termination three-phase alternating currents, to be used for converting three-phase alternating current into direct voltage;
Clamp circuit comprises a clamp switch and four clamp diodes, is connected between the collector electrode and emitter of this clamp switch after per two clamp diodes series connection, and the mid point of the clamp diode of series connection is connected to two rectifier bridges and H bridge circuit respectively each other; And
The H bridge circuit comprises left half-bridge and right half-bridge, and left and right sides half-bridge respectively comprises two series connection and is connected to two clamp switch between the rectifier bridge, and two clamp switch mid points of left half-bridge are connected with this clamp circuit, and two clamp switch mid points of right half-bridge are exported as three-phase;
Wherein, the left half-bridge mid point of each phase links to each other.
2. three-phase five-electrical level inverter as claimed in claim 1 is characterized in that: each rectifier bridge comprises six diodes, parallel connection after per two diodes are connected each other, and two diode intermediate nodes of series connection connect three-phase alternating current each other.
3. three-phase five-electrical level inverter as claimed in claim 2 is characterized in that: these power supply circuits also comprise two filter capacitors, and these two filter capacitors are connected in series between these two rectifier bridges.
4. three-phase five-electrical level inverter as claimed in claim 3 is characterized in that: the mid point of these two filter capacitors is connected in the mid point of two clamp diodes of this clamp circuit.
5. three-phase five-electrical level inverter as claimed in claim 1 is characterized in that: two clamp switch collector electrodes of the mutual series connection of this H bridge circuit connect two rectifier bridges respectively, and emitter links to each other.
6. three-phase five-electrical level inverter as claimed in claim 5; It is characterized in that: be connected a clamp diode between the collector electrode of each clamp switch of this H bridge circuit and the emitter; This clamp diode anode connects the emitter of clamp switch, and negative electrode connects the collector electrode of clamp switch.
7. three-phase five-electrical level inverter as claimed in claim 1 is characterized in that: this clamp switch is IGBT.
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| CN2012101912388A CN102801348A (en) | 2012-06-11 | 2012-06-11 | Three-phase five-level inverter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051231A (en) * | 2012-12-10 | 2013-04-17 | 阳光电源股份有限公司 | Three-phase five-level inverter |
| CN105790271A (en) * | 2016-04-12 | 2016-07-20 | 国网江苏省电力公司扬州供电公司 | Active power electric filter circuit based on three-phase bridge inversion circuit and work method thereof |
| CN106787814A (en) * | 2017-03-29 | 2017-05-31 | 哈尔滨理工大学 | Nine level current transformers of magneto alternator |
| CN109104112A (en) * | 2018-08-13 | 2018-12-28 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of pulse duration modulation method of three-phase NPC-H bridge five-electrical level inverter |
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| US4670828A (en) * | 1986-02-25 | 1987-06-02 | Sundstrand Corporation | Bi-directional switch for neutral point clamped PWM inverter |
| US6058031A (en) * | 1997-10-23 | 2000-05-02 | General Electric Company | Five level high power motor drive converter and control system |
| CN1464631A (en) * | 2002-06-28 | 2003-12-31 | 河南电力试验研究所 | Five-level high-voltage frequency converter |
| CN101154895A (en) * | 2007-08-28 | 2008-04-02 | 山西合创电力科技有限公司 | Five-power level non-harmonic switching network topological circuit of variable reference stacking technology |
| US20090244936A1 (en) * | 2008-03-31 | 2009-10-01 | Sma Solar Technology Ag | Three-phase inverter |
| EP2509209A2 (en) * | 2011-04-05 | 2012-10-10 | Hamilton Sundstrand Corporation | Active rectification output capacitor balancing |
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2012
- 2012-06-11 CN CN2012101912388A patent/CN102801348A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4670828A (en) * | 1986-02-25 | 1987-06-02 | Sundstrand Corporation | Bi-directional switch for neutral point clamped PWM inverter |
| US6058031A (en) * | 1997-10-23 | 2000-05-02 | General Electric Company | Five level high power motor drive converter and control system |
| CN1464631A (en) * | 2002-06-28 | 2003-12-31 | 河南电力试验研究所 | Five-level high-voltage frequency converter |
| CN101154895A (en) * | 2007-08-28 | 2008-04-02 | 山西合创电力科技有限公司 | Five-power level non-harmonic switching network topological circuit of variable reference stacking technology |
| US20090244936A1 (en) * | 2008-03-31 | 2009-10-01 | Sma Solar Technology Ag | Three-phase inverter |
| EP2509209A2 (en) * | 2011-04-05 | 2012-10-10 | Hamilton Sundstrand Corporation | Active rectification output capacitor balancing |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051231A (en) * | 2012-12-10 | 2013-04-17 | 阳光电源股份有限公司 | Three-phase five-level inverter |
| CN105790271A (en) * | 2016-04-12 | 2016-07-20 | 国网江苏省电力公司扬州供电公司 | Active power electric filter circuit based on three-phase bridge inversion circuit and work method thereof |
| CN106787814A (en) * | 2017-03-29 | 2017-05-31 | 哈尔滨理工大学 | Nine level current transformers of magneto alternator |
| CN109104112A (en) * | 2018-08-13 | 2018-12-28 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of pulse duration modulation method of three-phase NPC-H bridge five-electrical level inverter |
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Application publication date: 20121128 |