CN110707955A - Three-phase multi-level inverter circuit - Google Patents
Three-phase multi-level inverter circuit Download PDFInfo
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- CN110707955A CN110707955A CN201911193243.0A CN201911193243A CN110707955A CN 110707955 A CN110707955 A CN 110707955A CN 201911193243 A CN201911193243 A CN 201911193243A CN 110707955 A CN110707955 A CN 110707955A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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Abstract
The embodiment of the invention relates to a three-phase multi-level inverter circuit, which comprises a direct-current power supply, three groups of multi-level inverter modules connected with the direct-current power supply in parallel and output ends connected with the three groups of multi-level inverter modules; each group of multi-level inversion modules comprises a switched capacitor unit and a half-bridge inversion unit connected with the switched capacitor unit. The three-phase multi-level inverter circuit converts the voltage input by a direct current power supply into three-phase multi-level alternating current through the switch capacitor units and the half-bridge inverter units on the three groups of multi-level inverter modules and outputs the three-phase multi-level alternating current from the output end, so that the three-phase multi-level alternating current output is realized by adopting one power supply input, the circuit structure of the three-phase multi-level inverter circuit is simple, and the technical problem that the existing multi-level inverter circuit needs a plurality of input direct current power supplies and cannot automatically boost is solved.
Description
Technical Field
The invention relates to the technical field of power electronic inverter circuits, in particular to a three-phase multi-level inverter circuit.
Background
With the development of society, people have more and more demands on non-renewable resources, and non-renewable resources can be used up, so that petroleum, coal and other stone non-renewable energy sources are used by people and are less and less. Therefore, at present, the energy crisis and the energy pollution approach to each other step by step, and the acquisition of new energy has become very urgent, and the distributed power generation technology represented by wind energy and solar energy and the distributed energy storage technology represented by batteries and super capacitors are more and more highly regarded by various countries in the world. The development and application of these emerging energy sources and new technologies is highly dependent on the performance of power electronic inverter devices. Most of the existing power electronic inverter devices are realized by adopting a two-level inverter circuit, and the two-level inverter circuit has the defects of high harmonic content, low efficiency and the like.
With the rapid development of power electronic technology, the current power electronic inverter also adopts a multi-level inverter circuit to realize the conversion of a power supply, and compared with a two-level inverter circuit, the multi-level inverter circuit has the advantages of less harmonic content of output voltage, low voltage stress of devices, less electromagnetic interference, higher efficiency and the like. Typical multilevel inverter circuits include diode clamped, capacitor clamped, and H-bridge cascaded. The diode clamping type and the capacitor clamping type have the problems that circuit clamping is complex and autonomous boosting is not achieved in a multi-level inverter circuit, and the H-bridge cascade type multi-level inverter circuit needs a plurality of independent direct-current power supplies, so that the multi-level inverter circuit is complex.
Therefore, in view of the above circumstances, how to design a multi-level inverter circuit having a simple circuit structure, a small number of input power supplies, and an autonomous boosting capability becomes an important technical problem to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a three-phase multi-level inverter circuit, which is used for solving the technical problems that a plurality of input direct-current power supplies are required and automatic boosting is not required in the conventional multi-level inverter circuit.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a three-phase multi-level inverter circuit comprises a direct current power supply, three groups of multi-level inverter modules connected with the direct current power supply in parallel and output ends connected with the three groups of multi-level inverter modules; wherein the content of the first and second substances,
each group of multi-level inversion modules comprises a switched capacitor unit and a half-bridge inversion unit connected with the switched capacitor unit;
the three groups of multi-level inversion modules respectively correspond to three phases of three-phase power, and the three groups of multi-level inversion modules are respectively an A-phase multi-level inversion module, a B-phase multi-level inversion module and a C-phase multi-level inversion module; the output end comprises an A-phase output end, a B-phase output end and a C-phase output end corresponding to the A-phase multi-level inversion module, the B-phase multi-level inversion module and the C-phase multi-level inversion module.
Preferably, the switched capacitor unit includes a first fully controlled switching element, a second fully controlled switching element, a third switching element, a fourth switching element, a first capacitor and a second capacitor;
the first end of the first fully-controlled switching element is respectively connected with the second end of the second fully-controlled switching element, the second end of the first capacitor and the first end of the second capacitor; the first end of the second full-control switching element is connected with the second end of the third switching element and serves as the first end of the multi-level inversion module; a first terminal of the third switching element is connected to a first terminal of the first capacitor; the second end of the first full-control switch element is connected with the first end of the fourth switch element and serves as the second end of the multi-level inverter module; a second terminal of the fourth switching element is connected to a second terminal of the second capacitor;
the first end of the multi-level inversion module is connected with the positive pole of the direct current power supply, and the second end of the multi-level inversion module is connected with the negative pole of the direct current power supply.
Preferably, the half-bridge inverting unit includes a fifth fully-controlled switching element and a sixth fully-controlled switching element connected in series with the fifth fully-controlled switching element; wherein;
a first end of the fifth fully-controlled switching element is connected with the switched capacitor unit; a second end of the sixth fully-controlled switching element is connected with the switched capacitor unit; and the second end of the fifth full-control switching element is connected with the first end of the sixth full-control switching element and is used as the third end of the multi-level inversion module, and the third end of the multi-level inversion module is connected with the output end.
Preferably, the voltage output between any two of the three output ends of the phase a output end, the phase B output end and the phase C output end is one, two or three times positive and negative of the output voltage of the direct current power supply;
or the voltage output between any two of the three output ends of the phase-A output end, the phase-B output end and the phase-C output end is 0.
Preferably, each group of multi-level inverter modules is provided with N switched capacitor units, and the N switched capacitor units are connected in parallel and then respectively connected in parallel with the dc power supply and the half-bridge inverter unit;
the first end of the second fully-controlled switching element of the 1 st switched capacitor unit in the N switched capacitor units is used as the first end of the multi-level inverter module; the second end of the first fully-controlled switching element of the 1 st switched capacitor unit in the N switched capacitor units is used as the second end of the multi-level inverter module;
n is an integer greater than 1.
Preferably, the three-phase multi-level inverter circuit further includes a third capacitor and a fourth capacitor connected in series with the third capacitor; wherein the content of the first and second substances,
and the first end of the fourth capacitor is connected with the positive pole of the direct current power supply, the second end of the third capacitor is connected with the negative pole of the direct current power supply, and the second end of the fourth capacitor is connected with the first end of the third capacitor and serves as the output end of the other three-phase multi-level inverter circuit.
Preferably, the three-phase multi-level inverter circuit further comprises a seventh fully-controlled switching element and an eighth fully-controlled switching element;
the first end of the seventh fully-controlled switching element is connected with the positive electrode of the direct-current power supply, the second end of the eighth fully-controlled switching element is connected with the negative electrode of the direct-current power supply, and the second end of the seventh fully-controlled switching element is connected with the first end of the eighth fully-controlled switching element and serves as the output end of the other one of the three-phase multi-level inverter circuits.
Preferably, each fully-controlled switching element in the three-phase multi-level inverter circuit is an N-channel MOSFET or a P-channel MOSFET or an IGBT device, wherein:
when each full-control switch element is an N-channel MOSFET, the drain electrode of the N-channel MOSFET is used as the first end of the full-control switch element, the source electrode of the N-channel MOSFET is used as the second end of the full-control switch element, and the grid electrode of the N-channel MOSFET is used as the control end of the full-control switch element;
when each full-control switch element is a P-channel MOSFET, the source electrode of the P-channel MOSFET is used as the first end of the full-control switch element, the drain electrode of the P-channel MOSFET is the second end of the full-control switch element, and the grid electrode of the P-channel MOSFET is used as the control end of the full-control switch element;
when each switching element is an IGBT element, a collector of the IGBT element is used as a first end of the fully-controlled switching element, an emitter of the IGBT is used as a second end of the fully-controlled switching element, and a base of the IGBT is used as a control end of the fully-controlled switching element.
Preferably, the third switch element and the fourth switch element in the switched capacitor unit are both selected to be N-channel MOSFET or P-channel MOSFET or IGBT device or diode; wherein:
when the third switching element and the fourth switching element both use N-channel MOSFETs, the drain of the N-channel MOSFET is used as the first end of the switching element, the source of the N-channel MOSFET is used as the second end of the switching element, and the gate of the N-channel MOSFET is used as the control end of the switching element;
when the third switch element and the fourth switch element both use P-channel MOSFETs, the source of the P-channel MOSFET is used as the first end of the switch element, the drain of the P-channel MOSFET is used as the second end of the switch element, and the gate of the P-channel MOSFET is used as the control end of the switch element;
when the third switching element and the fourth switching element are both selected from IGBT devices, a collector of each IGBT device is used as a first end of each switching element, an emitter of each IGBT device is used as a second end of each switching element, and a base of each IGBT device is used as a control end of each switching element;
when the third switching element and the fourth switching element are both selected to be diodes, the cathode of the diode is used as the first end of the switching element, and the anode of the diode is used as the second end of the switching element.
Preferably, the control end of each fully-controlled switching element on the three-phase multi-level inverter circuit is connected to a controller, and the controller is configured to control on or off of each fully-controlled switching element, so as to convert the dc power supply into multi-level three-phase ac power and output the multi-level three-phase ac power.
According to the technical scheme, the embodiment of the invention has the following advantages: the three-phase multi-level inverter circuit converts the voltage input by a direct current power supply into three-phase multi-level alternating current through the switch capacitor units and the half-bridge inverter units on the three groups of multi-level inverter modules and outputs the three-phase multi-level alternating current from the output end, so that the three-phase multi-level alternating current output is realized by adopting one power supply input, the circuit structure of the three-phase multi-level inverter circuit is simple, and the technical problem that the existing multi-level inverter circuit needs a plurality of input direct current power supplies and cannot automatically boost is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a circuit framework of a three-phase multi-level inverter circuit according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a multi-level inverter module in a three-phase multi-level inverter circuit according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of another embodiment of a multi-level inverter module in a three-phase multi-level inverter circuit according to an embodiment of the invention.
Fig. 4 is a circuit schematic diagram of a plurality of working states of a three-phase multi-level inverter circuit according to an embodiment of the invention.
Fig. 5 is a schematic circuit diagram of a plurality of switched capacitor units of the three-phase multi-level inverter circuit according to the embodiment of the present invention.
Fig. 6 is a schematic circuit diagram of four three-phase output terminals of the three-phase multi-level inverter circuit according to the embodiment of the present invention.
Fig. 7 is a schematic circuit diagram of another embodiment of three-phase four output ends of a three-phase multi-level inverter circuit according to an embodiment of the invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Compared with two-level inversion, multi-level inversion has the advantages of low device voltage stress, low harmonic content and low switching loss, so that the multi-level inversion is widely applied to high-voltage direct-current transmission, reactive compensation, active power filtering and high-voltage high-power speed regulation systems. In a common multilevel inverter circuit, an H-bridge cascaded multilevel circuit needs a plurality of direct current power supplies for power supply, so that the cost of the H-bridge cascaded multilevel inverter circuit is increased, and the use occasions are limited; diode clamping type, flying capacitor type and modularized multi-level inverter circuits only need one direct-current power supply input, but the circuits do not have the self-boosting capacity, so the circuits need high-voltage direct-current input.
However, with the wide application of new energy power generation and battery energy storage devices in the fields of electric vehicles, smart grids, and the like, there is an urgent need for a power converter having both boosting and multilevel inversion functions to convert the low-voltage dc source voltage into a high-voltage ac that meets the voltage requirements of the electric devices or is the same as the grid voltage. Obviously, a power change circuit with independent boosting and multi-level inversion capabilities is needed to meet the application of rapidly-developed new energy power generation and battery energy storage equipment in the fields of electric vehicles, smart power grids and the like.
Therefore, the embodiment of the application provides a three-phase multi-level inverter circuit, which is used for solving the technical problem that the existing multi-level inverter circuit needs a plurality of input direct-current power supplies and cannot automatically boost.
As shown in fig. 1, fig. 1 is a schematic diagram of a circuit framework of a three-phase multi-level inverter circuit according to an embodiment of the present invention.
The embodiment of the invention provides a three-phase multi-level inverter circuit which comprises a direct-current power supply V, three groups of multi-level inverter modules 10 connected with the direct-current power supply V in parallel and output ends U connected with the three groups of multi-level inverter modules 10out(ii) a Each group of multi-level inversion modules 10 comprises a switched capacitor unit 11 and a half-bridge inversion unit 12 connected with the switched capacitor unit 11; the three groups of multi-level inversion modules 10 correspond to three phases of three-phase power respectively, and the three groups of multi-level inversion modules 10 are an A-phase multi-level inversion module, a B-phase multi-level inversion module and a C-phase multi-level inversion module respectively; corresponding to the A-phase multi-level inversion module, the B-phase multi-level inversion module and the C-phase multi-level inversion module, and an output end UoutComprises an A-phase output terminal uaPhase B output terminal ubAnd C phase output terminal uc。
The dc power supply is mainly used to supply dc power. In this embodiment, the DC voltage provided by the DC power supply is Vdc. Wherein, the output end UoutFor connection to a load.
The three-phase multi-level inverter circuit in the embodiment of the invention converts the voltage input by one direct current power supply into three-phase multi-level alternating current through the switched capacitor units and the half-bridge inverter units on the three groups of multi-level inverter modules and outputs the three-phase multi-level alternating current from the output end, so that the three-phase multi-level alternating current output is realized by adopting one power supply input.
As shown in fig. 2 and fig. 3, fig. 2 is a circuit schematic diagram of a multi-level inverter module in a three-phase multi-level inverter circuit according to an embodiment of the present invention, and fig. 3 is a circuit schematic diagram of another embodiment of a multi-level inverter module in a three-phase multi-level inverter circuit according to an embodiment of the present invention.
In one embodiment of the present invention, the switched capacitor unit 11 includes a first fully controlled switching element S1, a second fully controlled switching element S2, a third switching element S3, a fourth switching element S4, a first capacitor C1 and a second capacitor C2; the first end of the first fully-controlled switch element is respectively connected with the second end of the second fully-controlled switch element S2, the second end of the first capacitor C1 and the first end of the second capacitor C2; a first terminal of the second fully-controlled switching element S2 is connected to a second terminal of the third switching element S3 and serves as a first terminal of the multilevel inverter module 10; a first terminal of the third switching element S3 is connected to a first terminal of the first capacitor C1; a second terminal of the first fully-controlled switching element S1 is connected to a first terminal of the fourth switching element S4 and serves as a second terminal of the multi-level inverter module 10; a second terminal of the fourth switching element S4 is connected with a second terminal of the second capacitor C2; a first end of the multi-level inverter module 10 is connected to a positive electrode of the dc power supply V, and a second end of the multi-level inverter module 10 is connected to a negative electrode of the dc power supply V.
The half-bridge inverting unit 12 includes a fifth fully-controlled switching element S5 and a sixth fully-controlled switching element S6 connected in series with the fifth fully-controlled switching element S5; a first end of the fifth fully-controlled switching element S5 is connected to the switched capacitor unit 11; a second terminal of the sixth fully-controlled switching element S6 is connected to the switched capacitor unit 11; a second terminal of the fifth fully-controlled switching element S5 is connected to the first terminal of the sixth fully-controlled switching element S6 and serves as a third terminal of the multi-level inverter module 10, and the third terminal of the multi-level inverter module 10 and the output terminal UoutAnd (4) connecting.
The capacitor may be preferably an electrolytic capacitor. As shown in fig. 2, the first fully-controlled switching element S1, the second fully-controlled switching element S2, the third switching element S3, the fourth switching element S4, the fifth fully-controlled switching element S5 and the sixth fully-controlled switching element S6 are all N-channel MOSFETs or P-channel MOSFETs or IGBT devices. When each full-control switch element is an N-channel MOSFET, the drain electrode of the N-channel MOSFET is used as the first end of the full-control switch element, the source electrode of the N-channel MOSFET is used as the second end of the full-control switch element, and the grid electrode of the N-channel MOSFET is used as the control end of the full-control switch element; when each full-control switch element adopts a P-channel MOSFET, the source electrode of the P-channel MOSFET is used as the first end of the full-control switch element, the drain electrode of the P-channel MOSFET is the second end of the full-control switch element, and the grid electrode of the P-channel MOSFET is used as the control end of the full-control switch element; when each switching element is an IGBT device, the collector of the IGBT device is used as the first end of the full-control switching element, the emitter of the IGBT device is used as the second end of the full-control switching element, and the base of the IGBT device is used as the control end of the full-control switching element. As shown in fig. 3, the first fully-controlled switching element S1, the second fully-controlled switching element S2, the fifth fully-controlled switching element S5 and the sixth fully-controlled switching element S6 are all N-channel MOSFET or P-channel MOSFET or IGBT devices, and the pin definitions of the N-channel MOSFET or P-channel MOSFET or IGBT devices are described and are not described again. The third switching element S3 and the fourth switching element S4 are preferably diodes, the cathode of the diode is used as the first terminal of the switching element, and the anode of the diode is used as the second terminal of the switching element.
In an embodiment of the present invention, the control end of each fully-controlled switching element on the three-phase multi-level inverter circuit is connected to a controller, and the controller is configured to control on/off of each fully-controlled switching element, so as to convert the dc power V into multi-level three-phase ac power and output the multi-level three-phase ac power from the output terminal UoutAnd (6) outputting.
As shown in fig. 4, fig. 4 is a circuit schematic diagram of a plurality of operating states of a three-phase multi-level inverter circuit according to an embodiment of the invention.
In one embodiment of the invention, the A-phase output uaPhase B output terminal ubAnd C phase output terminal ucAny two of the three output terminals UoutThe voltage output between the two is the output voltage V of the direct current power supply VdcPlus or minus one time, plus or minus two times or plus or minus three times. Or an A-phase output uaPhase B output terminal ubAnd C phase output terminal ucAny two of the three output terminals UoutThe voltage output in between is 0.
It should be noted that, as shown in fig. 4, in the present embodiment, the third switching element S3 and the fourth switching element S4 are both diodes, when any two output terminals U are connectedoutThe voltage output in between is + VdcIf the controller controls the first fully-controlled switch element S1 and the fifth fully-controlled switch element S5 of the a-phase multi-level inverter module in the three phases to be turned on, the positive electrode of the third switch element S3 of the a-phase multi-level inverter module is connected to the positive electrode of the dc power supply V, the negative electrode of the third switch element S3 is connected to the first end of the first capacitor C1 and the first end of the fifth fully-controlled switch element S5, the second end of the first fully-controlled switch element S1 is connected to the negative electrode of the dc power supply V, the first end of the first fully-controlled switch element S1 is connected to the second end of the first capacitor C1, and the second end of the fifth fully-controlled switch element S5 is connected to the output terminal u of the a-phaseaConnecting; meanwhile, the controller controls a second full-control switching element S2 and a sixth full-control switching element S6 of the B-phase multi-level inverter module or the C-phase multi-level inverter module in the three phases to be conducted, a first end of a second full-control switching element S2 of the B-phase multi-level inverter module or the C-phase multi-level inverter module is connected with the positive electrode of the direct-current power supply V, a second end of a second full-control switching element S2 is connected with a first end of a second capacitor C2, a second end of a second capacitor C2 is connected with the positive electrode of a fourth switching element S4 and a second end of a sixth full-control switching element S6 respectively, the negative electrode of the fourth switching element S4 is connected with the negative electrode of the direct-current power supply V, and a first end of a sixth full-control switching element S6 is connected with a B-phase output end ubOr C phase output ucAre connected so that the slave output terminal UoutThe output voltage is + Vdc。
When any two output ends UoutThe voltage output in between is-VdcIf the controller controls the A phase in the three phasesThe second full-control switch element S2 and the sixth full-control switch element S6 of the multi-level inverter module are turned on, the first end of the second full-control switch element S2 in the a-phase multi-level inverter module is connected to the positive electrode of the dc power supply V, the second end of the second full-control switch element S2 is connected to the first end of the second capacitor C2, the second end of the second capacitor C2 is connected to the second end of the sixth full-control switch element S6 and the anode of the fourth switch element S4, the cathode of the fourth switch element S4 is connected to the negative electrode of the dc power supply V, and the first end of the sixth full-control switch element S6 is connected to the first end of the a-phase output terminal u 4aConnecting; meanwhile, the controller controls a first full-control switch element S1 and a fifth full-control switch element S5 of a B-phase multi-level inverter module or a C-phase multi-level inverter module in three phases to be conducted, the anode of a third switch element S3 in the B-phase multi-level inverter module or the C-phase multi-level inverter module is connected with the anode of a direct-current power supply V, the cathode of the third switch element S3 is respectively connected with a first end of a first capacitor C1 and a first end of a fifth full-control switch element S5, the second end of the first capacitor C1 is connected with a first end of the first full-control switch element S1, the second end of the first full-control switch element S1 is connected with the cathode of the direct-current power supply V, and the second end of the fifth full-control switch element S5 is connected with a B-phase output end ubOr C phase output ucAre connected so that the slave output terminal UoutThe output voltage is-Vdc。
When any two output ends UoutThe voltage output between is +2VdcIf the controller controls the second fully-controlled switching element S2 and the fifth fully-controlled switching element S5 of the a-phase multi-level inverter module in the three phases to be turned on, the first end of the second fully-controlled switching element S2 in the a-phase multi-level inverter module is connected to the positive electrode of the dc power supply V, the second end of the second fully-controlled switching element S2 is connected to the first end of the second capacitor C2 and the second end of the first capacitor C1, the second end of the second capacitor C2 is connected to the positive electrode of the fourth switching element S4, the cathode of the fourth switching element S4 is connected to the negative electrode of the dc power supply V, the first end of the first capacitor C1 is connected to the first end of the fifth fully-controlled switching element S5, and the second end of the fifth fully-controlled switching element S5 is connected to the a-phase output terminal uaConnecting; the controller controls the three phases of B-phase multi-level inversion module or C-phase multi-level inversion moduleThe second fully-controlled switching element S2 and the sixth fully-controlled switching element S6 of the level inversion module are turned on, the first terminal of the second fully-controlled switching element S2 in the B-phase multi-level inversion module or the C-phase multi-level inversion module is connected to the positive electrode of the dc power supply V, the second terminal of the second fully-controlled switching element S2 is connected to the first terminal of the second capacitor C2, the second terminal of the second capacitor C2 is connected to the positive electrode of the fourth switching element S4 and the second terminal of the sixth fully-controlled switching element S6, the cathode of the fourth switching element S4 is connected to the negative electrode of the dc power supply V, and the first terminal of the sixth fully-controlled switching element S6 is connected to the B-phase output terminal u 6bOr C phase output ucAre connected so that the slave output terminal UoutThe output voltage is +2Vdc。
When any two output ends UoutThe voltage output between is-2VdcIf the controller controls the second fully-controlled switching element S2 and the sixth fully-controlled switching element S6 of the a-phase multi-level inverter module in the three-phase to be turned on, the first end of the second fully-controlled switching element S2 in the a-phase multi-level inverter module is connected to the positive electrode of the dc power supply V, the second end of the second fully-controlled switching element S2 is connected to the first end of the second capacitor C2, the second end of the second capacitor C2 is connected to the positive electrode of the fourth switching element S4 and the second end of the sixth fully-controlled switching element S6, the cathode of the fourth switching element S4 is connected to the negative electrode of the dc power supply V, and the first end of the sixth fully-controlled switching element S6 is connected to the output end u of the a-phaseaConnecting; meanwhile, the controller controls a second fully-controlled switching element S2 and a fifth fully-controlled switching element S5 of the B-phase multi-level inverter module or the C-phase multi-level inverter module in the three phases to be turned on, a first end of a second fully-controlled switching element S2 of the B-phase multi-level inverter module or the C-phase multi-level inverter module is connected with the positive electrode of the direct-current power supply V, a second end of the second fully-controlled switching element S2 is connected with a second end of a first capacitor C1 and a first end of a second capacitor C2, a second end of a second capacitor C2 is connected with the positive electrode of a fourth switching element S4, a first end of the first capacitor C1 is connected with a first end of a fifth fully-controlled switching element S5, a cathode of the fourth switching element S4 is connected with the negative electrode of the direct-current power supply V, and a second end of the fifth fully-controlled switching element S5 is connected with a B-phase outputbOr C phase output ucIs connected to, fromSo that the slave output terminal UoutThe output voltage is-2Vdc。
When any two output ends UoutThe voltage output between is +3VdcIf the controller controls the second fully-controlled switching element S2 and the fifth fully-controlled switching element S5 of the a-phase multi-level inverter module in the three-phase to be turned on, the first end of the second fully-controlled switching element S2 in the a-phase multi-level inverter module is connected to the positive electrode of the dc power source V, the second end of the second fully-controlled switching element S2 is connected to the second end of the first capacitor C1 and the first end of the second capacitor C2, the second end of the second capacitor C2 is connected to the anode of the fourth switching element S4, the cathode of the fourth switching element S4 is connected to the negative electrode of the dc power source V, the second end of the first capacitor C1 is connected to the first end of the fifth fully-controlled switching element S5, and the second end of the fifth fully-controlled switching element S5 is connected to the a-phase output terminal uaConnecting; meanwhile, the controller controls a first fully-controlled switch element S1 and a sixth fully-controlled switch element S6 of a B-phase multi-level inverter module or a C-phase multi-level inverter module in three phases to be turned on, the anode of a third switch element S3 in the B-phase multi-level inverter module or the C-phase multi-level inverter module is connected with the anode of a direct-current power supply V, the cathode of the third switch element S3 is connected with the first end of a first capacitor C1, the second end of the first fully-controlled switch element S1 is connected with the cathode of the direct-current power supply V, the first end of the first fully-controlled switch element S1 is respectively connected with the second end of the first capacitor C1 and the first end of a second capacitor C2, the second end of the second capacitor C2 is connected with the second end of the sixth fully-controlled switch element S6, and the first end of the sixth fully-controlled switch element S6 is connected with the B-phase outputbOr C phase output ucAre connected so that the slave output terminal UoutThe output voltage is +3Vdc。
When any two output ends UoutThe voltage output between is-3VdcIf the controller controls the first fully-controlled switching element S1 and the sixth fully-controlled switching element S6 of the a-phase multi-level inverter module in the three-phase to be turned on, the second terminal of the first fully-controlled switching element S1 of the a-phase multi-level inverter module is connected to the negative terminal of the dc power source V, and the first terminal of the first fully-controlled switching element S1 is connected to the second terminal of the first capacitor C1 and the second terminal of the second capacitor C2 respectivelyA first terminal of the first capacitor C1 is connected to the cathode of the third switching element S3, the anode of the third switching element S3 is connected to the positive terminal of the DC power supply V, a second terminal of the second capacitor C2 is connected to the second terminal of the sixth fully controlled switching element S6, and a first terminal of the sixth fully controlled switching element S6 is connected to the phase-A output terminal uaConnecting; meanwhile, the controller controls the conduction of a second fully-controlled switching element S2 and a fifth fully-controlled switching element S5 of a B-phase multi-level inverter module or a C-phase multi-level inverter module in the three phases, a first end of a second fully-controlled switching element S2 of the B-phase multi-level inverter module or the C-phase multi-level inverter module is connected with the positive electrode of the direct-current power supply V, a second end of the second fully-controlled switching element S2 is connected with a second end of a first capacitor C1 and a first end of a second capacitor C2, a second end of a second capacitor C2 is connected with the positive electrode of a fourth switching element S4, a cathode of the fourth switching element S4 is connected with the negative electrode of the direct-current power supply V, a first end of the first capacitor C1 is connected with a first end of a fifth fully-controlled switching element S5, and a second end of the fifth fully-controlled switching element S5 is connected with a B-phase output end ubOr C phase output ucAre connected so that the slave output terminal UoutThe output voltage is-3Vdc。
When any two output ends UoutIf the controller controls the conduction of the first fully-controlled switching element S1 and the fifth fully-controlled switching element S5 of any two phases of the three-phase multi-level inverter module, the B-phase multi-level inverter module and the C-phase multi-level inverter module, the second end of the first fully-controlled switching element S1 of the a-phase multi-level inverter module is connected with the negative electrode of the dc power supply V, the first end of the first fully-controlled switching element S1 is connected with the second end of the first capacitor C1, the first end of the first capacitor C1 is connected with the cathode of the third switching element S3 and the first end of the fifth fully-controlled switching element S5, the anode of the third switching element S3 is connected with the positive electrode of the dc power supply V, and the second end of the fifth fully-controlled switching element S5 is connected with the a-phase output terminal u of the a-phaseaConnection, B phase output ubOr C phase output ucAre connected so that the slave output terminal UoutThe output voltage is 0. Or, if the controller controls the second fully-controlled switching element S2 and the second fully-controlled switching element S2 of the three-phase A-phase multi-level inverter moduleThe six fully-controlled switching element S6 is turned on, a first end of a second fully-controlled switching element S2 in any two phases of the A-phase multi-level inverter module, the B-phase multi-level inverter module and the C-phase multi-level inverter module is connected with the anode of a direct-current power supply V, a second end of the second fully-controlled switching element S2 is connected with a first end of a second capacitor C2, a second end of the second capacitor C2 is respectively connected with the anode of a fourth switching element S4 and the second end of a sixth fully-controlled switching element S6, the cathode of the fourth switching element S4 is connected with the cathode of the direct-current power supply V, and a first end of the sixth fully-controlled switching element S6 is connected with the U-phase output end AaPhase B output terminal ubOr C phase output ucAre connected so that the slave output terminal UoutThe output voltage is 0.
As shown in fig. 5, fig. 5 is a schematic circuit diagram of a plurality of switched capacitor units of a three-phase multi-level inverter circuit according to an embodiment of the present invention.
In an embodiment of the present invention, each group of multi-level inverter modules 10 is provided with N switched capacitor units 11, and the N switched capacitor units 11 are connected in parallel and then connected in parallel to a dc power supply V and a half-bridge inverter unit 12, respectively; the first end of the second fully-controlled switching element S2 of the 1 st switched capacitor cell 11 of the N switched capacitor cells 11 is used as the first end of the multi-level inverter module 10; the second end of the first fully-controlled switching element S1 of the 1 st switched capacitor cell 11 of the N switched capacitor cells 11 serves as the second end of the multilevel inverter module 10; n is an integer greater than 1.
Note that, the first end of the second fully-controlled switch element S2 of the ith switched capacitor cell 11 of the N switched capacitor cells 11 is connected to the first end of the first capacitor C1 of the i-1 th switched capacitor cell 11 of the N switched capacitor cells 11; the second end of the first fully-controlled switching element S1 of the ith switched capacitor cell 11 of the N switched capacitor cells 11 is connected to the second end of the second capacitor C2 of the (i-1) th switched capacitor cell 11 of the N switched capacitor cells 11; a first terminal of the first capacitor C1 of the nth switched-capacitor cell 11 of the N switched-capacitor cells 11 is connected to a first terminal of the fifth fully-controlled switching element S5 of the switched-capacitor cell 12; the second terminal of the second capacitor C2 of the nth switched capacitor unit 11 of the N switched capacitor units 11 is connected to the second terminal of the sixth fully controlled switching element S6 of the switched capacitor unit 12. Wherein i is an integer and 1< i ≦ N.
In this embodiment, the controller can control the on/off of each fully-controlled switch element to make the output voltage of the three-phase multi-level inverter circuit be positive and negative one time, positive and negative two times, or positive and negative three times of the output voltage of the dc voltage source and zero level, and total 7 ac outputs with different levels are provided. As for the working modes corresponding to the three-phase multi-level inverter circuit when outputting different levels, the working modes are similar as described above in fig. 4, and are not described again here.
It can be seen that the number of output levels of the three-phase multi-level inverter circuit can be changed by turning on or off the fully-controlled switching elements in the switched capacitor unit 11 and the half-bridge inverter unit 12.
Example two:
as shown in fig. 6, fig. 6 is a schematic circuit diagram of four three-phase output terminals of a three-phase multi-level inverter circuit according to an embodiment of the present invention.
The three-phase multi-level inverter circuit further comprises a third capacitor C3 and a fourth capacitor C4 connected in series with the third capacitor C3, wherein a first end of the fourth capacitor C4 is connected with a positive pole of a direct current power supply V, a second end of the third capacitor C3 is connected with a negative pole of the direct current power supply V4, and a second end of the fourth capacitor C4 is connected with a first end of the third capacitor C3 and serves as an output end U of the other three-phase multi-level inverter circuitout。
It should be noted that the three-phase multi-level inverter circuit has four output terminals UoutThree of which are output terminals UoutThe details are set forth in the first embodiment, and the embodiments are not described one by one; another output terminal UoutIs marked as uoOutput terminal uoIs output by connecting a positive electrode and a negative electrode of a direct current power supply V in parallel with a capacitor.
Example three:
as shown in fig. 7, fig. 7 is a schematic circuit diagram of another embodiment of three-phase four output ends of a three-phase multi-level inverter circuit according to the embodiment of the present invention.
The invention providesThe three-phase multi-level inverter circuit further comprises a seventh fully-controlled switch element S7 and an eighth fully-controlled switch element S8, a first end of the seventh fully-controlled switch element S7 is connected with the positive electrode of the direct-current power supply V, a second end of the eighth fully-controlled switch element S8 is connected with the negative electrode of the direct-current power supply V, a second end of the seventh fully-controlled switch element S7 is connected with a first end of the eighth fully-controlled switch element S8 and serves as an output end U of the other three-phase multi-level inverter circuitout。
It should be noted that the three-phase multi-level inverter circuit has four output terminals UoutThree of which are output terminals UoutThe details are set forth in the first embodiment, and the embodiments are not described one by one; another output terminal UoutIs marked as uoOutput terminal uoThe output is realized by connecting the positive electrode and the negative electrode of a direct current power supply V in parallel with a full-control switching element. In this embodiment, the fully-controlled switching element may be an N-channel MOSFET, a P-channel MOSFET, or an IGBT device, and the structures and types of these devices have been described in detail in the first embodiment, which is not described in one-to-one.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A three-phase multi-level inverter circuit is characterized by comprising a direct-current power supply, three groups of multi-level inverter modules connected with the direct-current power supply in parallel and output ends connected with the three groups of multi-level inverter modules; wherein the content of the first and second substances,
each group of multi-level inversion modules comprises a switched capacitor unit and a half-bridge inversion unit connected with the switched capacitor unit;
the three groups of multi-level inversion modules respectively correspond to three phases of three-phase power, and the three groups of multi-level inversion modules are respectively an A-phase multi-level inversion module, a B-phase multi-level inversion module and a C-phase multi-level inversion module; the output end comprises an A-phase output end, a B-phase output end and a C-phase output end corresponding to the A-phase multi-level inversion module, the B-phase multi-level inversion module and the C-phase multi-level inversion module.
2. The three-phase multi-level inverter circuit according to claim 1, wherein the switched capacitor unit comprises a first fully controlled switching element, a second fully controlled switching element, a third switching element, a fourth switching element, a first capacitor and a second capacitor;
the first end of the first fully-controlled switching element is respectively connected with the second end of the second fully-controlled switching element, the second end of the first capacitor and the first end of the second capacitor; the first end of the second full-control switching element is connected with the second end of the third switching element and serves as the first end of the multi-level inversion module; a first terminal of the third switching element is connected to a first terminal of the first capacitor; the second end of the first full-control switch element is connected with the first end of the fourth switch element and serves as the second end of the multi-level inverter module; a second terminal of the fourth switching element is connected to a second terminal of the second capacitor;
the first end of the multi-level inversion module is connected with the positive pole of the direct current power supply, and the second end of the multi-level inversion module is connected with the negative pole of the direct current power supply.
3. The three-phase multi-level inverter circuit according to claim 1, wherein the half-bridge inverter unit comprises a fifth fully-controlled switching element and a sixth fully-controlled switching element connected in series with the fifth fully-controlled switching element; wherein the content of the first and second substances,
a first end of the fifth fully-controlled switching element is connected with the switched capacitor unit; a second end of the sixth fully-controlled switching element is connected with the switched capacitor unit; and the second end of the fifth full-control switching element is connected with the first end of the sixth full-control switching element and is used as the third end of the multi-level inversion module, and the third end of the multi-level inversion module is connected with the output end.
4. The three-phase multi-level inverter circuit according to claim 1, wherein a voltage output between any two of the three of the a-phase output terminal, the B-phase output terminal, and the C-phase output terminal is one, two, or three times positive and negative of the dc power supply output voltage;
or the voltage output between any two of the three output ends of the phase-A output end, the phase-B output end and the phase-C output end is 0.
5. The three-phase multi-level inverter circuit according to claim 2, wherein each group of multi-level inverter modules is provided with N switched capacitor units, and the N switched capacitor units are connected in parallel and then respectively connected in parallel with the dc power supply and the half-bridge inverter unit;
the first end of the second fully-controlled switching element of the 1 st switched capacitor unit in the N switched capacitor units is used as the first end of the multi-level inverter module; the second end of the first fully-controlled switching element of the 1 st switched capacitor unit in the N switched capacitor units is used as the second end of the multi-level inverter module;
n is an integer greater than 1.
6. The three-phase multi-level inverter circuit according to claim 1, further comprising a third capacitor and a fourth capacitor connected in series with the third capacitor; wherein the content of the first and second substances,
and the first end of the fourth capacitor is connected with the positive pole of the direct current power supply, the second end of the third capacitor is connected with the negative pole of the direct current power supply, and the second end of the fourth capacitor is connected with the first end of the third capacitor and serves as the output end of the other three-phase multi-level inverter circuit.
7. The three-phase multi-level inverter circuit according to claim 1, further comprising a seventh fully-controlled switching element and an eighth fully-controlled switching element;
the first end of the seventh fully-controlled switching element is connected with the positive electrode of the direct-current power supply, the second end of the eighth fully-controlled switching element is connected with the negative electrode of the direct-current power supply, and the second end of the seventh fully-controlled switching element is connected with the first end of the eighth fully-controlled switching element and serves as the output end of the other one of the three-phase multi-level inverter circuits.
8. The three-phase multi-level inverter circuit according to any one of claims 1 to 7, wherein each fully-controlled switching element in the three-phase multi-level inverter circuit is an N-channel MOSFET or a P-channel MOSFET or an IGBT device, wherein:
when each full-control switch element is an N-channel MOSFET, the drain electrode of the N-channel MOSFET is used as the first end of the full-control switch element, the source electrode of the N-channel MOSFET is used as the second end of the full-control switch element, and the grid electrode of the N-channel MOSFET is used as the control end of the full-control switch element;
when each full-control switch element is a P-channel MOSFET, the source electrode of the P-channel MOSFET is used as the first end of the full-control switch element, the drain electrode of the P-channel MOSFET is the second end of the full-control switch element, and the grid electrode of the P-channel MOSFET is used as the control end of the full-control switch element;
when each switching element is an IGBT element, a collector of the IGBT element is used as a first end of the fully-controlled switching element, an emitter of the IGBT is used as a second end of the fully-controlled switching element, and a base of the IGBT is used as a control end of the fully-controlled switching element.
9. The three-phase multi-level inverter circuit according to claim 8, wherein the third switching element and the fourth switching element in the switched capacitor unit are both selected to be N-channel MOSFET or P-channel MOSFET or IGBT device or diode; wherein:
when the third switching element and the fourth switching element both use N-channel MOSFETs, the drain of the N-channel MOSFET is used as the first end of the switching element, the source of the N-channel MOSFET is used as the second end of the switching element, and the gate of the N-channel MOSFET is used as the control end of the switching element;
when the third switch element and the fourth switch element both use P-channel MOSFETs, the source of the P-channel MOSFET is used as the first end of the switch element, the drain of the P-channel MOSFET is used as the second end of the switch element, and the gate of the P-channel MOSFET is used as the control end of the switch element;
when the third switching element and the fourth switching element are both selected from IGBT devices, a collector of each IGBT device is used as a first end of each switching element, an emitter of each IGBT device is used as a second end of each switching element, and a base of each IGBT device is used as a control end of each switching element;
when the third switching element and the fourth switching element are both selected to be diodes, the cathode of the diode is used as the first end of the switching element, and the anode of the diode is used as the second end of the switching element.
10. The three-phase multi-level inverter circuit according to claim 1, wherein a control terminal of each fully-controlled switching element on the three-phase multi-level inverter circuit is connected to a controller, and the controller is configured to control on/off of each fully-controlled switching element, so as to convert the dc power supply into a multi-level three-phase ac power and output the multi-level three-phase ac power.
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| CN113676072A (en) * | 2021-08-04 | 2021-11-19 | 广东工业大学 | Pulse width modulation method of three-phase switched capacitor multi-level inverter |
| CN117277850A (en) * | 2023-10-07 | 2023-12-22 | 苏州东菱振动试验仪器有限公司 | Topological circuit of multi-level inverter and multi-level inverter |
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| CN110112943A (en) * | 2019-05-20 | 2019-08-09 | 广东工业大学 | A kind of both-end multi-level inverter circuit and inversion system |
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| CN110112943A (en) * | 2019-05-20 | 2019-08-09 | 广东工业大学 | A kind of both-end multi-level inverter circuit and inversion system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113676072A (en) * | 2021-08-04 | 2021-11-19 | 广东工业大学 | Pulse width modulation method of three-phase switched capacitor multi-level inverter |
| CN117277850A (en) * | 2023-10-07 | 2023-12-22 | 苏州东菱振动试验仪器有限公司 | Topological circuit of multi-level inverter and multi-level inverter |
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