CN111224574B - Multi-level conversion system - Google Patents

Multi-level conversion system Download PDF

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CN111224574B
CN111224574B CN202010091038.XA CN202010091038A CN111224574B CN 111224574 B CN111224574 B CN 111224574B CN 202010091038 A CN202010091038 A CN 202010091038A CN 111224574 B CN111224574 B CN 111224574B
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fully
controlled switch
switch tube
capacitor
power supply
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CN111224574A (en
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叶远茂
王晓琳
怡勇
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Guangdong University of Technology
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Guangdong University of Technology
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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
    • 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
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention provides a multilevel conversion system, comprising: DC power supply VHA first capacitor C1And a second capacitor C2I T-type three-level circuits, DC/DC converter, i third capacitors C3And i switched capacitor multi-level circuits; a first capacitor C1Negative electrode of and DC power supply VHIs connected to the negative pole of a second capacitor C2Positive pole of (2) and DC power supply VHIs connected to the positive pole of the first capacitor C1Positive electrode of and a second capacitor C2The negative electrode of (a) is connected to a neutral point N; the input end of the DC/DC converter is connected with a DC power supply VHI third capacitors C3Is connected in parallel with the output end of the DC/DC converter, the kth switched capacitor multi-level circuit and the kth third capacitor C3The multi-level conversion system provided by the invention is simple in structure and less in required quantity of input power supplies.

Description

Multi-level conversion system
Technical Field
The invention relates to the technical field of power electronic power conversion, in particular to a multilevel conversion system.
Background
With the increasing exhaustion of fossil energy such as petroleum and coal, the energy crisis and energy pollution approach step by step, the acquisition of new energy has become very urgent, distributed power generation technologies represented by wind energy and solar energy and distributed energy storage technologies represented by batteries and super capacitors are increasingly paid high attention from countries in the world, and the development and application of these emerging energy and new technologies are highly dependent on the performance of power electronic inverter devices.
However, the conventional two-level inverter circuit has the defects of high harmonic content, low efficiency and the like. In recent years, with the rapid development of power electronic technology, multi-level inverter circuit systems have attracted attention, and advantages of the multi-level inverter circuit systems include low harmonic content of output voltage, low voltage stress of devices, low electromagnetic interference, high efficiency and the like. Typical multilevel inverter circuits include diode clamped, capacitor clamped, and H-bridge cascaded. The capacitor clamping type and capacitor clamping type multi-level inverter circuits need a plurality of clamping devices and are very complex when the number of output levels is large, and the H-bridge cascade type multi-level inverter circuit needs a plurality of independent direct-current power supplies.
In summary, how to design a multi-level inverter circuit with a simple circuit structure, a large number of output levels and a small number of input power supplies is a problem to be solved.
Disclosure of Invention
In order to overcome the defects that the existing multi-level inverter circuit system is complex in structure and has a large number of input power supplies, the invention provides a multi-level conversion system which is based on a switched capacitor and a T-shaped circuit, is simple in structure and needs a small number of input power supplies.
The present invention aims to solve the above technical problem at least to some extent.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a multilevel conversion system comprising: DC power supply VHFor connecting the DC power supply VHFirst capacitor C with output voltage sharing1And a second capacitor C2I T-type three-level circuits 1 for level conversion, a DC/DC converter, i third capacitors C for filtering3And i switched capacitor multi-level circuits; a first capacitor C1Negative electrode of and DC power supply VHIs connected to the negative pole of a second capacitor C2Positive pole of (2) and DC power supply VHIs connected to the positive pole of the first capacitor C1Positive electrode of and a second capacitor C2The negative electrode of (a) is connected to a neutral point N; the input end of the DC/DC converter is connected with a DC power supply VHI third capacitors C3Is connected in parallel with the output end of the DC/DC converter, the kth switched capacitor multi-level circuit and the kth third capacitor C3Are connected in parallel; the first input end a of any T-shaped three-level circuit 1 is connected with a direct current power supply VHA second input terminal b is connected with the neutral point N, and a third input terminal c is connected with a direct current power supply VHThe output end d of the kth T-type three-level circuit 1 is connected with the first output end e of the kth switched capacitor multi-level circuit, i represents a positive integer, and k is a positive integer between 1 and i.
Here, the T-type three-level circuit 1 converts the voltages of the first capacitor C1 and the second capacitor C2 into three-level alternating-current voltages, and the DC/DC converter converts the direct-current power supply V into three-level alternating-current voltagesHThe output DC voltage is converted into DC voltage with another amplitude, and the switched capacitor multi-level circuit converts the DC voltage output by the DC/DC converter into multi-level voltageAn alternating voltage.
Preferably, the multilevel conversion system further comprises a controller and a driver for providing control signals for the T-type three-level circuit 1 and the switched capacitor multilevel circuit; the T-type three-level circuit 1 and the switched capacitor multi-level circuit respectively comprise a plurality of fully-controlled switching tubes, the driver is connected with the controller, and control signals generated by the controller are converted into driving signals for driving the T-type three-level circuit 1 and the fully-controlled switching tubes in the switched capacitor multi-level circuit to be switched on or switched off.
Here, the cooperation of driver and controller is used, the control signal that sends the controller converts the drive signal that drives T type three level circuit 1 and the switching capacitor multilevel circuit full control switch tube and switch on or off, belongs to current more mature technique, and the driver of present multiple model all can be realized.
Preferably, the T-type three-level circuit 1 comprises a first fully-controlled switch tube S1, a second fully-controlled switch tube S2, a third fully-controlled switch tube S3 and a fourth fully-controlled switch tube S4; the first end of the first fully-controlled switch tube S1 is the first input end a of the T-type three-level circuit 1, the second end of the second fully-controlled switch tube S2 is the second input end b of the T-type three-level circuit 1, the second end of the first fully-controlled switch tube S1 is connected to the first end of the second fully-controlled switch tube S2 and the second end of the third fully-controlled switch tube S3, the connection point is the output end d of the T-type three-level circuit 1, the first end of the third fully-controlled switch tube S3 is connected to the first end of the fourth fully-controlled switch tube S4, and the second end of the fourth fully-controlled switch tube S4 is the third input end c of the T-type three-level circuit 1.
Preferably, the switched capacitor multi-level circuit comprises a fifth fully-controlled switch tube S5, a sixth fully-controlled switch tube S6, a seventh fully-controlled switch tube S7, an eighth fully-controlled switch tube S8, a ninth fully-controlled switch tube S9, a tenth fully-controlled switch tube S10, a first diode D3 and a fourth capacitor C4; a first end of the fifth fully-controlled switch tube S5 is connected to the first end of the seventh fully-controlled switch tube S7 and the first end of the ninth fully-controlled switch tube S9, respectively, a connection point is a first input end f of a switched capacitor multi-level circuit, a second end of the fifth fully-controlled switch tube S5 is connected to a negative electrode of the fourth capacitor C4 and the first end of the sixth fully-controlled switch tube S6, respectively, a second end of the sixth fully-controlled switch tube S6 is connected to an anode of the first diode D3 and serves as a second input end g of the switched capacitor multi-level circuit, a cathode of the first diode D3 is connected to an anode of the fourth capacitor C4, a second end of the eighth fully-controlled switch tube S8 and a second end of the tenth fully-controlled switch tube S10, a first end of the eighth fully-controlled switch tube S8 is connected to a second end of the seventh fully-controlled switch tube S7 and serves as an output end e of the switched capacitor multi-level circuit, the first end of the tenth fully-controlled switch tube S10 is connected to the second end of the ninth fully-controlled switch tube S9, and serves as the second output end h of the switched-capacitor multi-level circuit.
Preferably, the switched capacitor multi-level circuit further includes an eleventh fully-controlled switch tube S11, a twelfth fully-controlled switch tube S12, a second diode D4 and a fifth capacitor C5, a first end of the eleventh fully-controlled switch tube S11 is connected to the first end of the fifth fully-controlled switch tube S5 and the cathode of the second diode D4, an anode of the second diode D4 is connected to the first end of the seventh fully-controlled switch tube S7, the first end of the ninth fully-controlled switch tube S9 and the cathode of the fifth capacitor C5, an anode of the fifth capacitor C5 is connected to the second end of the eleventh fully-controlled switch tube S11 and the first end of the twelfth fully-controlled switch tube S12, and a first end of the twelfth fully-controlled switch tube S12 is connected to the second end of the sixth fully-controlled switch tube S6 and the anode of the second diode D4.
Preferably, any one of the first diode D3 and the second diode D4 can be replaced by a fully-controlled switch.
Preferably, the fully-controlled switch tube is one or any combination of an N-channel power field effect transistor, a P-channel power field effect transistor or an insulated gate bipolar transistor.
When the fully-controlled switch tube is an N-channel power field effect transistor, the gate of the N-channel power field effect transistor serves as the control end of the fully-controlled switch tube, the source of the N-channel power field effect transistor serves as the first end of the fully-controlled switch tube, and the drain of the N-channel power field effect transistor serves as the second end of the fully-controlled switch tube; when the fully-controlled switch tube is a P-channel power field effect transistor, the grid electrode of the P-channel power field effect transistor is used as the control end of the fully-controlled switch tube, the drain electrode of the P-channel power field effect transistor is used as the first end of the fully-controlled switch tube, and the source electrode of the P-channel power field effect transistor is used as the second end of the fully-controlled switch tube; when the full-control switch tube is an insulated gate bipolar transistor, a gate pole of the insulated gate bipolar transistor is used as a control end of the full-control switch tube, an emitting electrode of the insulated gate bipolar transistor is used as a first end of the full-control switch tube, and a collecting electrode of the insulated gate bipolar transistor is used as a second end of the full-control switch tube.
Preferably, the DC/DC converter converts the DC power supply VHOutput voltage V ofhConverted into a DC voltage VLThe switch capacitor multi-level circuit converts the output DC voltage V of the DC/DC converterLConversion to 0, ± VL、±2VLFive kinds or 0, +/-VL、±2VL、±3VLSeven AC voltage, T type three level circuit 1 will DC power supply VHOutput voltage V ofhConversion to. + -. 0.5Vh0 three alternating voltages; when the DC power supply VHOutput voltage V ofhAnd an output voltage V of the DC/DC converterLWhen the ratios are different, the types of the alternating-current voltages output by the multilevel conversion system are different.
Here, the DC power supply V is controlledHOutput voltage V ofhAnd an output voltage V of the DC/DC converterLBy the ratio, the alternating voltage output by the multilevel conversion system can be realized:
when the DC power supply VHVoltage V ofhAnd the output voltage V of the DC/DC converterLRatio V ofh:VLWhen the ratio is 6:1, the multilevel conversion system outputs 0 +/-VL、±2VL、±3VL、±4VLAnd. + -. 5VLEleven alternating voltages;
when the DC power supply VHVoltage V ofhAnd the output voltage V of the DC/DC converterLRatio V ofh:VLWhen the ratio is 8:1, the output of the multilevel conversion system is 0, ± VL、±2VL、±3VL、±4VL、±5VL、±6VLAnd. + -. 7VLFifteen kinds of alternating voltage;
when the DC power supply VHVoltage V ofhAnd the output voltage V of the DC/DC converterLRatio V ofh:VLWhen the ratio is 10:1, the multilevel conversion system outputs 0 +/-VL、±2VL、±3VL、±4VL、±5VL、±6VL、±7VLAnd. + -. 8VLSeventeen kinds of alternating voltage;
when the DC power supply voltage VHAnd an output voltage V of the DC/DC converterLRatio V ofH:VLWhen the ratio is 12:1, the multilevel power conversion system outputs 0 +/-VL、±2VL、±3VL、±4VL、±5VL、±6VL、±7VL、±8VLAnd 9VLNineteen alternating voltages;
when the DC power supply voltage VHAnd an output voltage V of the DC/DC converterLRatio V ofH:VLWhen the ratio is 14:1, the multilevel power conversion system outputs 0 +/-VL、±2VL、±3VL、±4VL、±5VL、±6VL、±7VL、±8VL、±9VLAnd. + -. 10VLTwenty-one alternating voltage.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a multi-level conversion system, which utilizes a T-shaped three-level circuit and a switched capacitor multi-level circuit to carry out multi-level conversion, and compared with the existing multi-level conversion system adopting a capacitor clamp type and a capacitor clamp type multi-level inverter circuit, the multi-level conversion system has a simple structure, can realize multi-level output, only needs one input direct current power supply, and avoids the defect that the existing multi-level conversion system needs a large number of power supplies.
Drawings
Fig. 1 is a schematic diagram of a three-phase output circuit of a multilevel conversion system according to the present invention.
Fig. 2 is a schematic diagram of a single-phase output circuit of the multilevel conversion system according to the present invention.
Fig. 3 is a specific circuit diagram of the switched capacitor multi-level circuit according to the present invention.
Fig. 4 is a second specific circuit diagram of the switched capacitor multi-level circuit according to the present invention.
FIG. 5 is a schematic diagram of a switched capacitor multilevel circuit of the present invention using a fully-controlled switch S13 instead of the first diode D3.
FIG. 6 is a schematic diagram of a switched capacitor multilevel circuit according to the present invention, in which the second diode D4 is replaced by a fully-controlled switch tube S14.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The schematic circuit structure of the three-phase output of the multilevel converter system shown in fig. 1 comprises: DC power supply VHFor connecting the DC power supply VHFirst capacitor C with output voltage sharing1And a second capacitor C23T-type three-level circuits 1 for level conversion, DC/DC converter, 3 third capacitors C for filtering3And 3 switched capacitor multi-level circuits, the T-type three-level circuit 1 converts the voltages of the first capacitor C1 and the second capacitor C2 into three-level alternating-current voltages, and the DC/DC converter converts a direct-current power supply VHThe output DC voltage is converted into DC voltage with another amplitude, and the switched capacitor multi-level circuit converts the DC voltage output by the DC/DC converter into multi-level AC voltageThe multilevel conversion system also comprises a controller and a driver which provide control signals for the T-shaped three-level circuit 1 and the switched capacitor multilevel circuit; all include a plurality of full control switch tube in T type three level circuit 1 and the switched capacitor multilevel circuit, driver connection director, the control signal who produces the controller converts the drive signal who drives the switch tube in T type three level circuit 1 and the switched capacitor multilevel circuit and switch on or off into, utilize the cooperation of driver and controller, the control signal who sends the controller converts the drive signal who drives the switch tube in T type three level circuit 1 and the switched capacitor multilevel circuit and switch on or off into, belong to current relatively mature technique, the driver of present multiple model all can be realized, in this embodiment, the model that the driver chooseed for use is SI 8233.
Referring to fig. 1, a first capacitor C1Negative electrode of and DC power supply VHIs connected to the negative pole of a second capacitor C2Positive pole of (2) and DC power supply VHIs connected to the positive pole of the first capacitor C1Positive electrode of and a second capacitor C2The negative electrode of (a) is connected to a neutral point N; the input end of the DC/DC converter is connected with a DC power supply VH3 third capacitors C3Is connected in parallel with the output end of the DC/DC converter, the first switched capacitor multi-level circuit and the first third capacitor C3A second switched-capacitor multi-level circuit connected in parallel with a second third capacitor C3A third switched-capacitor multi-level circuit connected in parallel with a third capacitor C3Are connected in parallel; the first input end a of any T-shaped three-level circuit 1 is connected with a direct current power supply VHA second input terminal b is connected with the neutral point N, and a third input terminal c is connected with a direct current power supply VHThe output end d of the first T-type three-level circuit 1 is connected to the first output end e of the first switched capacitor multi-level circuit, the output end d of the second T-type three-level circuit 1 is connected to the first output end e of the second switched capacitor multi-level circuit, the output end d of the third T-type three-level circuit 1 is connected to the first output end e of the third switched capacitor multi-level circuit, and the specific circuit structure of the single-phase output of the multi-level conversion system shown in fig. 2 is further describedThe schematic diagram shows that in practical implementation, adjustment from single phase to three phase can be performed according to needs.
Referring to fig. 2, the T-type three-level circuit 1 includes a first fully-controlled switch tube S1, a second fully-controlled switch tube S2, a third fully-controlled switch tube S3 and a fourth fully-controlled switch tube S4; the first end of the first fully-controlled switch tube S1 is the first input end a of the T-type three-level circuit 1, the second end of the second fully-controlled switch tube S2 is the second input end b of the T-type three-level circuit 1, the second end of the first fully-controlled switch tube S1 is connected to the first end of the second fully-controlled switch tube S2 and the second end of the third fully-controlled switch tube S3, the connection point is the output end d of the T-type three-level circuit 1, the first end of the third fully-controlled switch tube S3 is connected to the first end of the fourth fully-controlled switch tube S4, and the second end of the fourth fully-controlled switch tube S4 is the third input end c of the T-type three-level circuit 1.
Fig. 3 shows a specific circuit of the switched capacitor multi-level circuit, which includes a fifth fully-controlled switch S5, a sixth fully-controlled switch S6, a seventh fully-controlled switch S7, an eighth fully-controlled switch S8, a ninth fully-controlled switch S9, a tenth fully-controlled switch S10, a first diode D3, and a fourth capacitor C4; a first end of the fifth fully-controlled switch tube S5 is connected to the first end of the seventh fully-controlled switch tube S7 and the first end of the ninth fully-controlled switch tube S9, respectively, a connection point is a first input end f of a switched capacitor multi-level circuit, a second end of the fifth fully-controlled switch tube S5 is connected to a negative electrode of the fourth capacitor C4 and the first end of the sixth fully-controlled switch tube S6, respectively, a second end of the sixth fully-controlled switch tube S6 is connected to an anode of the first diode D3 and serves as a second input end g of the switched capacitor multi-level circuit, a cathode of the first diode D3 is connected to an anode of the fourth capacitor C4, a second end of the eighth fully-controlled switch tube S8 and a second end of the tenth fully-controlled switch tube S10, a first end of the eighth fully-controlled switch tube S8 is connected to a second end of the seventh fully-controlled switch tube S7 and serves as an output end e of the switched capacitor multi-level circuit, the first end of the tenth fully-controlled switch tube S10 is connected to the second end of the ninth fully-controlled switch tube S9, and serves as the second output end h of the switched-capacitor multi-level circuit.
Fig. 4 is a second specific circuit schematic diagram of the switched capacitor multi-level circuit according to the present invention, the switched capacitor multi-level circuit further includes an eleventh fully-controlled switch tube S11, a twelfth fully-controlled switch tube S12, a second diode D4 and a fifth capacitor C5, a first end of the eleventh fully-controlled switch tube S11 is connected to the first end of the fifth fully-controlled switch tube S5 and a cathode of the second diode D4, an anode of the second diode D4 is connected to the first end of the seventh fully-controlled switch tube S7, the first end of the ninth fully-controlled switch tube S9 and a cathode of the fifth capacitor C5, an anode of the fifth capacitor C5 is connected to the second end of the eleventh fully-controlled switch tube S11 and the first end of the twelfth fully-controlled switch tube S12, and a first end of the twelfth fully-controlled switch tube S12 is connected to the second end of the sixth fully-controlled switch tube S6, The anode of the second diode D4 is connected.
In practice, any one of the first diode D3 and the second diode D4 can be replaced by a fully-controlled switch. FIG. 5 is a schematic diagram of a switched capacitor multi-level circuit using a fully controlled switch S13 instead of the first diode D3, and FIG. 6 is a schematic diagram of a switched capacitor multi-level circuit using a fully controlled switch S14 instead of the second diode D4, wherein the first diode D3 and the second diode D4 are respectively replaced by a thirteenth fully controlled switch S13 and a fourteenth fully controlled switch S14; the first end of the thirteenth fully-controlled switch tube S13 is connected to the second end of the sixth fully-controlled switch tube S6, and the second end of the thirteenth fully-controlled switch tube S13 is connected to the fourth capacitor C4Is connected with the positive pole of the fourteenth fully-controlled switching tube S14, and the first end of the fourteenth fully-controlled switching tube S14 is connected with the fifth capacitor C5And a second end of the fourteenth full-control switch tube S15 is connected to a first end of the eleventh full-control switch S11.
In this embodiment, the fully-controlled switch is an N-channel power field effect transistor, the gate of the N-channel power field effect transistor is used as the control terminal of the fully-controlled switch, the source of the N-channel power field effect transistor is used as the first terminal of the fully-controlled switch, and the drain of the N-channel power field effect transistor is used as the second terminal of the fully-controlled switch.
DC/DC converter for converting DC to DCCurrent source VHOutput voltage V ofhConverted into a DC voltage VLThe switch capacitor multi-level circuit converts the output DC voltage V of the DC/DC converterLConversion to 0, ± VL、±2VLFive kinds or 0, +/-VL、±2VL、±3VLSeven AC voltage, T type three level circuit 1 will DC power supply VHOutput voltage V ofhConversion to. + -. 0.5Vh0 three alternating voltages; when the DC power supply VHOutput voltage V ofhAnd an output voltage V of the DC/DC converterLWhen the ratios are different, the types of the alternating-current voltages output by the multi-level conversion system are different, and when the direct-current power supply V is usedHVoltage V ofhAnd the output voltage V of the DC/DC converterLRatio V ofh:VLWhen the ratio is 6:1, the multilevel conversion system outputs 0 +/-VL、±2VL、±3VL、±4VLAnd. + -. 5VLEleven alternating voltages;
when the DC power supply VHVoltage V ofhAnd the output voltage V of the DC/DC converterLRatio V ofh:VLWhen the ratio is 8:1, the output of the multilevel conversion system is 0, ± VL、±2VL、±3VL、±4VL、±5VL、±6VLAnd. + -. 7VLFifteen kinds of alternating voltage;
when the DC power supply VHVoltage V ofhAnd the output voltage V of the DC/DC converterLRatio V ofh:VLWhen the ratio is 10:1, the multilevel conversion system outputs 0 +/-VL、±2VL、±3VL、±4VL、±5VL、±6VL、±7VLAnd. + -. 8VLSeventeen kinds of alternating voltage;
when the DC power supply voltage VHAnd an output voltage V of the DC/DC converterLRatio V ofH:VLWhen the ratio is 12:1, the multilevel power conversion system outputs 0 +/-VL、±2VL、±3VL、±4VL、±5VL、±6VL、±7VL、±8VLAnd 9VLNineteen alternating voltages;
when the DC power supply voltage VHAnd an output voltage V of the DC/DC converterLRatio V ofH:VLWhen the ratio is 14:1, the multilevel power conversion system outputs 0 +/-VL、±2VL、±3VL、±4VL、±5VL、±6VL、±7VL、±8VL、±9VLAnd. + -. 10VLTwenty-one alternating voltage.
The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (7)

1. A multi-level conversion system, comprising: DC power supply VHFor connecting the DC power supply VHIs equally divided by a first capacitor C1And a second capacitor C2I T-type three-level circuits 1 for level conversion, a DC/DC converter, i third capacitors C for filtering3And i switched capacitor multi-level circuits; a first capacitor C1Negative electrode of and DC power supply VHIs connected to the negative pole of a second capacitor C2Positive pole of (2) and DC power supply VHIs connected to the positive pole of the first capacitor C1Positive electrode of and a second capacitor C2The negative electrode of (a) is connected to a neutral point N; the input end of the DC/DC converter is connected with a DC power supply VHI third capacitors C3Is connected in parallel with the output end of the DC/DC converter, the kth switched capacitor multi-level circuit and the kth third capacitor C3Connected in parallel(ii) a The first input end a of any T-shaped three-level circuit 1 is connected with a direct current power supply VHA second input terminal b is connected with the neutral point N, and a third input terminal c is connected with a direct current power supply VHThe output end d of the kth T-type three-level circuit 1 is connected with the first output end e of the kth switched capacitor multi-level circuit, i represents a positive integer, and k is a positive integer between 1 and i;
the DC/DC converter converts the DC power supply VHOutput voltage V ofhConverted into a DC voltage VLThe switch capacitor multi-level circuit converts the output DC voltage V of the DC/DC converterLConversion to 0, ± VL、±2VLFive kinds or 0, +/-VL、±2VL、±3VLSeven AC voltage, T type three level circuit 1 will DC power supply VHOutput voltage V ofhConversion to. + -. 0.5Vh0 three alternating voltages; when the DC power supply VHOutput voltage V ofhAnd an output voltage V of the DC/DC converterLWhen the ratios are different, the types of the alternating-current voltages output by the multi-level conversion system are different; controlling a DC power supply VHOutput voltage V ofhAnd an output voltage V of the DC/DC converterLIn this case, the ac voltage output by the multilevel conversion system:
when the DC power supply VHVoltage V ofhAnd the output voltage V of the DC/DC converterLRatio V ofh:VLWhen the ratio is 6:1, the multilevel conversion system outputs 0 +/-VL、±2VL、±3VL、±4VLAnd. + -. 5VLEleven alternating voltages;
when the DC power supply VHVoltage V ofhAnd the output voltage V of the DC/DC converterLRatio V ofh:VLWhen the ratio is 8:1, the output of the multilevel conversion system is 0, ± VL、±2VL、±3VL、±4VL、±5VL、±6VLAnd. + -. 7VLFifteen kinds of alternating voltage;
when the DC power supply VHVoltage V ofhAnd the output voltage V of the DC/DC converterLRatio V ofh:VLWhen the ratio is 10:1, the multilevel conversion system outputs 0 +/-VL、±2VL、±3VL、±4VL、±5VL、±6VL、±7VLAnd. + -. 8VLSeventeen kinds of alternating voltage;
when the DC power supply voltage VHAnd an output voltage V of the DC/DC converterLRatio V ofH:VLWhen the ratio is 12:1, the multilevel conversion system outputs 0 +/-VL、±2VL、±3VL、±4VL、±5VL、±6VL、±7VL、±8VLAnd 9VLNineteen alternating voltages;
when the DC power supply voltage VHAnd an output voltage V of the DC/DC converterLRatio V ofH:VLWhen the ratio is 14:1, the multilevel conversion system outputs 0, ± VL、±2VL、±3VL、±4VL、±5VL、±6VL、±7VL、±8VL、±9VLAnd. + -. 10VLTwenty-one alternating voltage.
2. The multilevel converter system according to claim 1, further comprising a controller, a driver providing control signals for the T-type three-level circuit 1 and the switched capacitor multilevel circuit; the T-type three-level circuit 1 and the switched capacitor multi-level circuit respectively comprise a plurality of fully-controlled switching tubes, the driver is connected with the controller, and control signals generated by the controller are converted into driving signals for driving the T-type three-level circuit 1 and the fully-controlled switching tubes in the switched capacitor multi-level circuit to be switched on or switched off.
3. The multilevel converter system according to claim 2, wherein the T-type three-level circuit 1 comprises a first fully-controlled switch S1, a second fully-controlled switch S2, a third fully-controlled switch S3 and a fourth fully-controlled switch S4; the first end of the first fully-controlled switch tube S1 is the first input end a of the T-type three-level circuit 1, the second end of the second fully-controlled switch tube S2 is the second input end b of the T-type three-level circuit 1, the second end of the first fully-controlled switch tube S1 is connected to the first end of the second fully-controlled switch tube S2 and the second end of the third fully-controlled switch tube S3, the connection point is the output end d of the T-type three-level circuit 1, the first end of the third fully-controlled switch tube S3 is connected to the first end of the fourth fully-controlled switch tube S4, and the second end of the fourth fully-controlled switch tube S4 is the third input end c of the T-type three-level circuit 1.
4. The multilevel converter system of claim 2, wherein the switched capacitor multilevel circuit comprises a fifth fully-controlled switch S5, a sixth fully-controlled switch S6, a seventh fully-controlled switch S7, an eighth fully-controlled switch S8, a ninth fully-controlled switch S9, a tenth fully-controlled switch S10, a first diode D3, and a fourth capacitor C4; a first end of the fifth fully-controlled switch tube S5 is connected to the first end of the seventh fully-controlled switch tube S7 and the first end of the ninth fully-controlled switch tube S9, respectively, a connection point is a first input end f of a switched capacitor multi-level circuit, a second end of the fifth fully-controlled switch tube S5 is connected to a negative electrode of the fourth capacitor C4 and the first end of the sixth fully-controlled switch tube S6, respectively, a second end of the sixth fully-controlled switch tube S6 is connected to an anode of the first diode D3 and serves as a second input end g of the switched capacitor multi-level circuit, a cathode of the first diode D3 is connected to an anode of the fourth capacitor C4, a second end of the eighth fully-controlled switch tube S8 and a second end of the tenth fully-controlled switch tube S10, a first end of the eighth fully-controlled switch tube S8 is connected to a second end of the seventh fully-controlled switch tube S7 and serves as an output end e of the switched capacitor multi-level circuit, the first end of the tenth fully-controlled switch tube S10 is connected to the second end of the ninth fully-controlled switch tube S9, and serves as the second output end h of the switched-capacitor multi-level circuit.
5. The multilevel converter system of claim 4, wherein the switched capacitor multilevel circuit further comprises an eleventh fully controlled switch S11, a twelfth fully controlled switch S12, a second diode D4, and a fifth capacitor C5, a first end of the eleventh fully-controlled switch tube S11 is respectively connected to a first end of the fifth fully-controlled switch S5 and a cathode of the second diode D4, the anode of the second diode D4 is connected to the first terminal of the seventh fully-controlled switch S7, the first terminal of the ninth fully-controlled switch S9, and the cathode of the fifth capacitor C5, the positive electrode of the fifth capacitor C5 is respectively connected to the second end of the eleventh fully-controlled switch tube S11 and the first end of the twelfth fully-controlled switch tube S12, a second end of the twelfth fully-controlled switch tube S12 is connected to the second end of the sixth fully-controlled switch tube S6 and the anode of the first diode D3, respectively.
6. The multilevel converter system of claim 5, wherein any one of the first diode D3 and the second diode D4 can be replaced by a fully controlled switch.
7. The multilevel converter system according to claim 2, wherein the fully-controlled switch is one or any combination of an N-channel power field effect transistor, a P-channel power field effect transistor or an insulated gate bipolar transistor.
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