CN117498712A - Five-level energy storage inverter - Google Patents
Five-level energy storage inverter Download PDFInfo
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- CN117498712A CN117498712A CN202311333366.6A CN202311333366A CN117498712A CN 117498712 A CN117498712 A CN 117498712A CN 202311333366 A CN202311333366 A CN 202311333366A CN 117498712 A CN117498712 A CN 117498712A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 38
- 239000003990 capacitor Substances 0.000 claims abstract description 107
- 230000007935 neutral effect Effects 0.000 description 8
- 230000005669 field effect Effects 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4837—Flying capacitor converters
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Abstract
The application provides a five-level energy storage inverter, including: the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm; the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are connected in parallel; the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm all comprise: the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the seventh switch tube, the eighth switch tube, the first flying capacitor and the second flying capacitor; the first switch tube is connected with the second switch tube and the first flying capacitor; the second switching tube is connected with the third switching tube and the seventh switching tube; the third switching tube is connected with the fourth switching tube, the first flying capacitor and the second flying capacitor; the fourth switching tube is connected with the fifth switching tube and the eighth switching tube; the fifth switching tube is connected with the sixth switching tube and the second flying capacitor; the seventh switching tube is connected with the eighth switching tube so as to solve the problem of excessive components of the five-level energy storage inverter.
Description
Technical Field
The application relates to the technical field of energy storage devices, in particular to a five-level energy storage inverter.
Background
Multilevel inverters with medium voltage capacity have become one of the effective solutions to cope with the increased power demands of medium voltage drives. Medium voltage drives with voltage class of 2.2-15kV and power capacity of 1-30MW are used in railway traction and electric transportation systems such as electric ships. Therefore, high-efficiency inverters are critical to handling high-power operation of medium-voltage drive systems.
In a five-level inverter, the cascaded H-bridge has power and/or voltage scalability, wherein the operating voltage can be up to 13.8kV, and the addition of a phase-shifting transformer to generate multiple isolated dc power supplies is required, which results in increased weight, size and cost of the five-level inverter. Second, the neutral point clamped H-bridge, the active neutral point clamped H-bridge and the neutral point clamped module of the series multi-level inverter are adopted to replace the H-bridge, and the number of isolated direct current sources is reduced by 50%, but compared with the cascaded H-bridge, the total component number is increased significantly. In addition, the topology of these five-level inverters still requires a phase shifting transformer and an additional dc bus neutral-point voltage controller, which increases the control complexity and cost of the system.
Disclosure of Invention
The application provides a five-level energy storage inverter to solve the problem that components and parts of five-level energy storage inverter are too many.
The application provides a five-level energy storage inverter, including: the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm.
The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are connected in parallel; the first leg, the second leg, the third leg, and the fourth leg each include: the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the seventh switch tube, the eighth switch tube, the first flying capacitor and the second flying capacitor.
The collector electrode of the first switching tube is connected with the positive electrode of the direct-current side bus; the emitter of the first switching tube is connected with the collector of the second switching tube and the first end of the first flying capacitor; the emitter of the second switching tube is connected with the collector of the third switching tube and the collector of the seventh switching tube; the emitter of the third switching tube is connected with the collector of the fourth switching tube, the second end of the first flying capacitor and the first end of the second flying capacitor; the emitter of the fourth switching tube is connected with the collector of the fifth switching tube and the emitter of the eighth switching tube; the emitter of the fifth switching tube is connected with the collector of the sixth switching tube and the second end of the second flying capacitor; an emitter of the sixth switching tube is connected with a negative electrode of the direct-current side bus; and the emitter of the seventh switching tube is connected with the collector of the eighth switching tube.
By connecting the switching tube and the flying capacitor in the mode, the quantity of the switching tube and the flying capacitor can be reduced while the high efficiency of the five-level energy storage inverter is ensured, devices such as a phase shift transformer and a voltage controller are not needed to be additionally arranged, the size of the five-level energy storage inverter is reduced, the control complexity and the cost of a system are reduced, and the problem of excessive components of the five-level energy storage inverter can be solved.
Optionally, the rated voltage of the first flying capacitor and the rated voltage of the second flying capacitor are each one fourth of the rated voltage of the direct current side bus.
The quality of output voltage and current can be improved by controlling the switching state and voltage level of the first flying capacitor and the second flying capacitor to be one fourth of the rated voltage of the direct current side bus.
Optionally, the first switch tube comprises a first insulated gate bipolar transistor and a second insulated gate bipolar transistor; the first insulated gate bipolar transistor and the second insulated gate bipolar transistor are connected in series.
The first insulated gate bipolar transistor and the second insulated gate bipolar transistor are composite full-control voltage driven type power semiconductor devices formed by bipolar triodes and insulated gate field effect transistors, have the advantages of high input impedance and low conduction voltage drop, have small driving power and reduced saturated voltage, and are suitable for the five-level energy storage inverter.
Optionally, the sixth switching tube comprises a third insulated gate bipolar transistor and a fourth insulated gate bipolar transistor; the third insulated gate bipolar transistor and the fourth insulated gate bipolar transistor are connected in series.
The third insulated gate bipolar transistor and the fourth insulated gate bipolar transistor are composite full-control voltage-driven power semiconductor devices formed by bipolar triodes and insulated gate field effect transistors, have the advantages of high input impedance and low conduction voltage drop, have small driving power and reduced saturation voltage, and are suitable for the five-level energy storage inverter.
Optionally, the rated voltages of the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the third insulated gate bipolar transistor and the fourth insulated gate bipolar transistor are all one fourth of the rated voltage of the direct current side bus.
By setting the rated voltage of the insulated gate bipolar transistor to be one fourth of the rated voltage of the direct current side bus, the total cut-off voltage of the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm can be controlled.
Optionally, the cut-off voltages of the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the seventh switch tube and the eighth switch tube are all one fourth of the rated voltage of the direct current side bus.
The cut-off voltages of the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the seventh switch tube and the eighth switch tube are set to be one fourth of the rated voltage of the direct-current side bus, so that each bridge arm can be controlled to output five different level values conveniently, and control complexity is reduced.
Optionally, the device further comprises three inductors, wherein first ends of the three inductors are respectively connected with emitters of the seventh switching tubes of the first bridge arm, the second bridge arm and the third bridge arm; and the second ends of the three inductors are connected with the emitters of the seventh switching tubes of the fourth bridge arm.
The alternating current output by the first bridge arm, the second bridge arm and the third bridge arm can be more stable through the inductor.
Optionally, the inductor further comprises a capacitor, wherein the first end of the capacitor is connected with the second end of the inductor; and the second end of the capacitor is connected with the emitter of the seventh switching tube of the fourth bridge arm.
The capacitor and the inductor can form a filter circuit to play roles in stabilizing current and inhibiting interference of electromagnetic waves.
Optionally, the device further comprises a resistor, wherein the resistor is connected in series with the inductor; the resistor is connected in parallel with the capacitor. The resistor is used for carrying power.
Optionally, the total cut-off voltage of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube is one half of the rated voltage of the direct current side bus.
The total cut-off voltage of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube is set to be one half of the rated voltage of the direct-current bus, so that the voltage values of the switch tubes and the flying capacitor in each bridge arm can be conveniently determined.
According to the technical scheme, the application provides a five-level energy storage inverter, which comprises: the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm. The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are connected in parallel; the first leg, the second leg, the third leg, and the fourth leg each include: the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the seventh switch tube, the eighth switch tube, the first flying capacitor and the second flying capacitor. The collector electrode of the first switching tube is connected with the positive electrode of the direct-current side bus; the emitter of the first switching tube is connected with the collector of the second switching tube and the first end of the first flying capacitor; the emitter of the second switching tube is connected with the collector of the third switching tube and the collector of the seventh switching tube; the emitter of the third switching tube is connected with the collector of the fourth switching tube, the second end of the first flying capacitor and the first end of the second flying capacitor; the emitter of the fourth switching tube is connected with the collector of the fifth switching tube and the emitter of the eighth switching tube; the emitter of the fifth switching tube is connected with the collector of the sixth switching tube and the second end of the second flying capacitor; an emitter of the sixth switching tube is connected with a negative electrode of the direct-current side bus; and the emitter of the seventh switching tube is connected with the collector of the eighth switching tube so as to solve the problem of excessive components of the five-level energy storage inverter.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a five-level energy storage inverter according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the present application. Merely as examples of systems and methods consistent with some aspects of the present application as detailed in the claims.
In a five-level inverter, the cascaded H-bridge has power and/or voltage scalability, wherein the operating voltage can be up to 13.8kV, and the addition of a phase-shifting transformer to generate multiple isolated dc power supplies is required, which results in increased weight, size and cost of the five-level inverter. Second, the neutral point clamped H-bridge, the active neutral point clamped H-bridge and the neutral point clamped module of the series multi-level inverter are adopted to replace the H-bridge, and the number of isolated direct current sources is reduced by 50%, but compared with the cascaded H-bridge, the total component number is increased significantly. In addition, the topology of these five-level inverters still requires a phase shifting transformer and an additional dc bus neutral-point voltage controller, which increases the control complexity and cost of the system.
In order to solve the problem of excessive components of the five-level energy storage inverter, referring to fig. 1, fig. 1 is a schematic structural diagram of the five-level energy storage inverter. The embodiment of the application provides a five-level energy storage inverter, which comprises: the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm.
The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are connected in parallel; the first leg, the second leg, the third leg, and the fourth leg each include: the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the seventh switch tube, the eighth switch tube, the first flying capacitor and the second flying capacitor.
The collector electrode of the first switching tube is connected with the positive electrode of the direct-current side bus; the emitter of the first switching tube is connected with the collector of the second switching tube and the first end of the first flying capacitor; the emitter of the second switching tube is connected with the collector of the third switching tube and the collector of the seventh switching tube; the emitter of the third switching tube is connected with the collector of the fourth switching tube, the second end of the first flying capacitor and the first end of the second flying capacitor; the emitter of the fourth switching tube is connected with the collector of the fifth switching tube and the emitter of the eighth switching tube; the emitter of the fifth switching tube is connected with the collector of the sixth switching tube and the second end of the second flying capacitor; an emitter of the sixth switching tube is connected with a negative electrode of the direct-current side bus; and the emitter of the seventh switching tube is connected with the collector of the eighth switching tube.
Referring to fig. 1, the first leg, the second leg, and the third leg may be an a-Phase leg (Phase a), a B-Phase leg (Phase B), and a C-Phase leg (Phase C). Specifically, the first bridge arm includes: the first power electronic switching tube Sa1, the second power electronic switching tube Sa2, the third power electronic switching tube Sa3, the fourth power electronic switching tube Sa4, the fifth power electronic switching tube Sa5, the sixth power electronic switching tube Sa6, the seventh power electronic switching tube Sa7, the eighth power electronic switching tube Sa8, the first flying capacitor Ca1 and the second flying capacitor Ca2. The collector electrode of the first power electronic switch tube Sa1 is connected with the positive electrode P of the direct current side bus; the emitter of the first power electronic switch tube Sa1 is connected with the collector of the second power electronic switch tube Sa2 and the first end of the first flying capacitor Cai at a point a 1; the emitter of the second power electronic switch tube Sa2 is connected with the collector of the third power electronic switch tube Sa3 and the collector of the seventh power electronic switch tube Sa7 at a point a 2; the emitter of the third power electronic switch tube Sa3 is connected with the collector of the fourth power electronic switch tube Sa4, the second end of the first flying capacitor Ca1 and the first end of the second flying capacitor Ca2 at a point a 3; the emitter of the fourth power electronic switch tube Sa4 is connected with the collector of the fifth power electronic switch tube Sa5 and the emitter of the eighth power electronic switch tube Sa8 at a point a 4; the emitter of the fifth power electronic switch tube Sa5 is connected with the collector of the sixth power electronic switch tube Sa6 and the second end of the second flying capacitor Ca2 at a point a 5; an emitter of the sixth power electronic switching tube Sa6 is connected with a negative electrode N of the direct current side bus; the emitter of the seventh power electronic switching tube Sa7 is connected with the collector of the eighth power electronic switching tube Sa8 at the point a.
The second bridge arm includes: the first power electronic switching tube Sb1, the second power electronic switching tube Sb2, the third power electronic switching tube Sb3, the fourth power electronic switching tube Sb4, the fifth power electronic switching tube Sb5, the sixth power electronic switching tube Sb6, the seventh power electronic switching tube Sb7, the eighth power electronic switching tube Sb8, the first flying capacitor Cb1 and the second flying capacitor Cb2. The collector electrode of the first power electronic switching tube Sb1 is connected with the positive electrode P of the direct-current side bus; the emitter of the first power electronic switch tube Sb1 is connected with the collector of the second power electronic switch tube Sb2 and the first end of the first flying capacitor Cb1 at a point b 1; the emitter of the second power electronic switching tube Sb2 is connected with the collector of the third power electronic switching tube Sb3 and the collector of the seventh power electronic switching tube Sb7 at a point b 2; an emitter of the third power electronic switch tube Sb3 is connected to the collector of the fourth power electronic switch tube Sb4, the second end of the first flying capacitor Cb1, and the first end of the second flying capacitor Cb2 at point b 3; the emitter of the fourth power electronic switching tube Sb4 is connected with the collector of the fifth power electronic switching tube Sb5 and the emitter of the eighth power electronic switching tube Sb8 at point b 4; an emitter of the fifth power electronic switching tube Sb5 is connected with a collector of the sixth power electronic switching tube Sb6 and the second end of the second flying capacitor Cb2 at point b 5; an emitter of the sixth power electronic switching tube Sb6 is connected with a negative electrode N of the direct-current side bus; the emitter of the seventh power electronic switch tube Sb7 is connected to the collector of the eighth power electronic switch tube Sb8 at point b.
The third leg includes: the first power electron switch tube Sc1, the second power electron switch tube Sc2, the third power electron switch tube Sc3, the fourth power electron switch tube Sc4, the fifth power electron switch tube Sc5, the sixth power electron switch tube Sc6, the seventh power electron switch tube Sc7, the eighth power electron switch tube Sc8, the first flying capacitor Cc1 and the second flying capacitor Cc2. The collector electrode of the first power electronic switch tube Sc1 is connected with the positive electrode P of the direct-current side bus; the emitter of the first power electronic switch tube Sc1 is connected with the collector of the second power electronic switch tube Sc2 and the first end of the first flying capacitor Cc1 at a point c 1; the emitter of the second power electron switch tube Sc2 is connected with the collector of the third power electron switch tube Sc3 and the collector of the seventh power electron switch tube Sc7 at a point c 2; the emitter of the third power electronic switch tube Sc3 is connected with the collector of the fourth power electronic switch tube Sc4, the second end of the first flying capacitor Cc1 and the first end of the second flying capacitor Cc2 at a point c 3; the emitter of the fourth power electron switch tube Sc4 is connected with the collector of the fifth power electron switch tube Sc5 and the emitter of the eighth power electron switch tube Sc8 at a point c 4; the emitter of the fifth power electronic switch tube Sc5 is connected with the collector of the sixth power electronic switch tube Sc6 and the second end of the second flying capacitor Cc2 at a point c 5; the emitter of the sixth power electronic switch tube Sc6 is connected with the negative electrode N of the direct-current side bus; and the emitter of the seventh power electron switch tube Sc7 is connected with the collector of the eighth power electron switch tube Sc8 at the point c.
The fourth leg includes: the first power electronic switching tube Sz1, the second power electronic switching tube Sz2, the third power electronic switching tube Sz3, the fourth power electronic switching tube Sz4, the fifth power electronic switching tube Sz5, the sixth power electronic switching tube Sz6, the seventh power electronic switching tube Sz7, the eighth power electronic switching tube Sz8, the first flying capacitor Cz1 and the second flying capacitor Cz2. The collector electrode of the first power electronic switching tube Sz1 is connected with the positive electrode P of the direct-current side bus; the emitter of the first power electronic switching tube Sz1 is connected with the collector of the second power electronic switching tube Sz2 and the first end of the first flying capacitor Cz1 at a point z 1; the emitter of the second power electronic switching tube Sz2 is connected with the collector of the third power electronic switching tube Sz3 and the collector of the seventh power electronic switching tube Sz7 at a point z 2; an emitter of the third power electronic switching tube Sz3 is connected to a collector of the fourth power electronic switching tube Sz4, a second end of the first flying capacitor Cz1, and a first end of the second flying capacitor Cz2 at a point z 3; the emitter of the fourth power electronic switching tube Sz4 is connected with the collector of the fifth power electronic switching tube Sz5 and the emitter of the eighth power electronic switching tube Sz8 at a point z 4; an emitter of the fifth power electronic switching tube Sz5 is connected with a collector of the sixth power electronic switching tube Sz6 and a second end of the second flying capacitor Cz2 at a point z 5; an emitter of the sixth power electronic switching tube Sz6 is connected with a negative electrode N of the direct current side bus; the emitter of the seventh power electronic switching tube Sz7 is connected to the collector of the eighth power electronic switching tube Sz8 at the point z.
By connecting the switching tube and the flying capacitor in the mode, the quantity of the switching tube and the flying capacitor can be reduced while the high efficiency of the five-level energy storage inverter is ensured, devices such as a phase shift transformer and a voltage controller are not needed to be additionally arranged, the size of the five-level energy storage inverter is reduced, the control complexity and the cost of a system are reduced, and the problem of excessive components of the five-level energy storage inverter can be solved.
In some embodiments, the voltage rating of the first flying capacitor and the second flying capacitor are each one-fourth of the voltage rating of the dc side bus.
The quality of output voltage and current can be improved by controlling the switching state and voltage level of the first flying capacitor and the second flying capacitor to be one fourth of the rated voltage of the direct current side bus.
In some embodiments, the first switching transistor comprises a first insulated gate bipolar transistor and a second insulated gate bipolar transistor; the first insulated gate bipolar transistor and the second insulated gate bipolar transistor are connected in series.
It should be understood that the insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) is a composite fully-controlled voltage-driven power semiconductor device composed of a BJT (bipolar transistor) and a MOS (insulated gate field effect transistor), and has the advantages of both high input impedance of a MOSFET (metal oxide semiconductor field effect transistor) and low on-voltage drop of a GTR (power transistor), and the advantages of small driving power and reduced saturation voltage, and has the characteristics of energy saving, convenient installation and maintenance, stable heat dissipation, and the like, and is suitable for the five-level energy storage inverter.
In some embodiments, the sixth switching tube comprises a third insulated gate bipolar transistor and a fourth insulated gate bipolar transistor; the third insulated gate bipolar transistor and the fourth insulated gate bipolar transistor are connected in series.
The third insulated gate bipolar transistor and the fourth insulated gate bipolar transistor are composite full-control voltage driven type power semiconductor devices formed by bipolar triodes and insulated gate field effect transistors, have the advantages of high input impedance and low conduction voltage drop, have the characteristics of low driving power and reduced saturated voltage, and have the characteristics of energy conservation, convenient installation and maintenance, stable heat dissipation and the like, and are suitable for the five-level energy storage inverter.
In some embodiments, the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the third insulated gate bipolar transistor, and the fourth insulated gate bipolar transistor each have a voltage rating that is one-fourth of the voltage rating of the dc side bus.
By setting the rated voltage of the insulated gate bipolar transistor to be one fourth of the rated voltage of the direct current side bus, the total cut-off voltage of the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm can be controlled.
In some embodiments, the cut-off voltages of the second, third, fourth, fifth, seventh, and eighth switching tubes are each one-fourth of the rated voltage of the dc-side bus.
The cut-off voltages of the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the seventh switch tube and the eighth switch tube are set to be one fourth of the rated voltage of the direct-current side bus, so that each bridge arm can be controlled to output five different level values conveniently, and control complexity is reduced.
In some embodiments, the circuit further comprises three inductors, wherein first ends of the three inductors are respectively connected with emitters of the seventh switching tubes of the first bridge arm, the second bridge arm and the third bridge arm; and the second ends of the three inductors are connected with the emitters of the seventh switching tubes of the fourth bridge arm.
It should be understood that the first ends of the three inductors (L1, L2, L3) are respectively connected with the emitters of the seventh switching tubes of the first, second and third legs at a common point n, thereby connecting the current (i) a 、i b 、i c 、i z ) To the grid side or to the load side. The alternating current output by the first bridge arm, the second bridge arm and the third bridge arm can be more stable through the inductor.
In some embodiments, the inductor further comprises a capacitor, wherein a first end of the capacitor is connected with a second end of the inductor; and the second end of the capacitor is connected with the emitter of the seventh switching tube of the fourth bridge arm.
The capacitors (C1, C2, C3) and the inductors (L1, L2, L3) can form a filter circuit, so that the effects of stabilizing current and inhibiting electromagnetic wave interference are achieved.
In some embodiments, further comprising a resistor (R1, R2, R3), the resistor (R1, R2, R3) being in series with the inductance (L1, L2, L3); the resistors (R1, R2, R3) are connected in parallel with the capacitors (C1, C2, C3). The resistor is used for carrying power.
In some embodiments, the total cut-off voltage of the first, second, third, fourth, fifth, and sixth switching tubes is one half of the rated voltage of the dc-side bus.
The total cut-off voltage of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube is set to be one half of the rated voltage of the direct-current bus, so that the voltage values of the switch tubes and the flying capacitor in each bridge arm can be conveniently determined.
In some embodiments, the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm have 8 working modes, and can output 5 level values.
It should be appreciated that the dc side bus power supply is rated at Vdc and is comprised of two dc power supplies rated at Vdc/2 in series. As shown in table 1, where the switching tube conduction is denoted by "1", the switching tube turn-off is denoted by "0", and x= a, b, c, z.
Table 1 single phase output mode of five level energy storage inverter
The 8 working modes are respectively as follows:
mode 1: the first switch tube Sx1 is switched on, the second switch tube Sx2 is switched on, the third switch tube Sx3 is switched off, the fourth switch tube Sx4 is switched off, the fifth switch tube Sx5 is switched off, the sixth switch tube Sx6 is switched off, the seventh switch tube Sx7 is switched on, the eighth switch tube Sx8 is switched off, the first flying capacitor Cx1 is unchanged, the second flying capacitor Cx2 is unchanged, and the output voltage Vxo is Vdc/2;
mode 2: the first switch tube Sx1 is switched on, the second switch tube Sx2 is switched off, the third switch tube Sx3 is switched on, the fourth switch tube Sx4 is switched off, the fifth switch tube Sx5 is switched off, the sixth switch tube Sx6 is switched off, the seventh switch tube Sx7 is switched on, the eighth switch tube Sx8 is switched off, the first flying capacitor Cx1 is charged, the second flying capacitor Cx2 is unchanged, and the output voltage Vxo is Vdc/4;
mode 3: the first switch tube Sx1 is switched on, the second switch tube Sx2 is switched off, the third switch tube Sx3 is switched off, the fourth switch tube Sx4 is switched on, the fifth switch tube Sx5 is switched off, the sixth switch tube Sx6 is switched off, the seventh switch tube Sx7 is switched off, the eighth switch tube Sx8 is switched on, the first flying capacitor Cx1 is charged, the second flying capacitor Cx2 is unchanged, and the output voltage Vxo is Vdc/4;
mode 4: the first switch tube Sx1 is turned off, the second switch tube Sx2 is turned on, the third switch tube Sx3 is turned off, the fourth switch tube Sx4 is turned off, the fifth switch tube Sx5 is turned off, the sixth switch tube Sx6 is turned on, the seventh switch tube Sx7 is turned on, the eighth switch tube Sx8 is turned off, the first flying capacitor Cx1 is discharged, the second flying capacitor Cx2 is discharged, and the output voltage Vxo is 0;
mode 5: the first switch tube Sx1 is switched on, the second switch tube Sx2 is switched off, the third switch tube Sx3 is switched off, the fourth switch tube Sx4 is switched off, the fifth switch tube Sx5 is switched on, the sixth switch tube Sx6 is switched off, the seventh switch tube Sx7 is switched off, the eighth switch tube Sx8 is switched on, the first flying capacitor Cx1 is charged, the second flying capacitor Cx2 is charged, and the output voltage Vxo is 0;
mode 6: the first switch tube Sx1 is turned off, the second switch tube Sx2 is turned off, the third switch tube Sx3 is turned off, the fourth switch tube Sx4 is turned on, the fifth switch tube Sx5 is turned off, the sixth switch tube Sx6 is turned on, the seventh switch tube Sx7 is turned off, the eighth switch tube Sx8 is turned on, the first flying capacitor Cx1 is unchanged, the second flying capacitor Cx2 is discharged, and the output voltage Vxo is-Vdc/4;
mode 7: the first switch tube Sx1 is turned off, the second switch tube Sx2 is turned off, the third switch tube Sx3 is turned on, the fourth switch tube Sx4 is turned off, the fifth switch tube Sx5 is turned off, the sixth switch tube Sx6 is turned on, the seventh switch tube Sx7 is turned on, the eighth switch tube Sx8 is turned off, the first flying capacitor Cx1 is unchanged, the second flying capacitor Cx2 is discharged, and the output voltage Vxo is-Vdc/4;
mode 8: the first switch tube Sx1 is turned off, the second switch tube Sx2 is turned off, the third switch tube Sx3 is turned off, the fourth switch tube Sx4 is turned off, the fifth switch tube Sx5 is turned on, the sixth switch tube Sx6 is turned on, the seventh switch tube Sx7 is turned off, the eighth switch tube Sx8 is turned on, the first flying capacitor Cx1 is unchanged, the second flying capacitor Cx2 is unchanged, and the output voltage Vxo is-Vdc/2.
The five-level inverter may be used in a medium voltage drive system. Compared with the modularized inverters such as a cascade H-bridge, a neutral point clamping type H-bridge, an active neutral point clamping type H-bridge, a series multi-level inverter and the like, the five-level inverter does not need any isolated direct current power supply and phase shifting transformer, so that the weight, the size and the cost of the system are reduced. The five-level inverter does not require clamping diodes and has a reduced number of active switches compared to an integrated structure inverter. The five-level inverter does not need direct current bus midpoint voltage control because of no split direct current bus structure. In addition, its flying capacitor count is low and the redundant state increases the efficiency of the inverter at low switching frequencies. The overall control complexity is relatively low.
According to the above technical scheme, the embodiment of the application provides a five-level energy storage inverter, which comprises: the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm. The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are connected in parallel; the first leg, the second leg, the third leg, and the fourth leg each include: the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the seventh switch tube, the eighth switch tube, the first flying capacitor and the second flying capacitor. The collector electrode of the first switching tube is connected with the positive electrode of the direct-current side bus; the emitter of the first switching tube is connected with the collector of the second switching tube and the first end of the first flying capacitor; the emitter of the second switching tube is connected with the collector of the third switching tube and the collector of the seventh switching tube; the emitter of the third switching tube is connected with the collector of the fourth switching tube, the second end of the first flying capacitor and the first end of the second flying capacitor; the emitter of the fourth switching tube is connected with the collector of the fifth switching tube and the emitter of the eighth switching tube; the emitter of the fifth switching tube is connected with the collector of the sixth switching tube and the second end of the second flying capacitor; an emitter of the sixth switching tube is connected with a negative electrode of the direct-current side bus; and the emitter of the seventh switching tube is connected with the collector of the eighth switching tube so as to solve the problem of excessive components of the five-level energy storage inverter.
The foregoing detailed description of the embodiments is merely illustrative of the general principles of the present application and should not be taken in any way as limiting the scope of the invention. Any other embodiments developed in accordance with the present application without inventive effort are within the scope of the present application for those skilled in the art.
Claims (10)
1. A five-level energy storage inverter, comprising: the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm;
the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are connected in parallel; the first leg, the second leg, the third leg, and the fourth leg each include: the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the seventh switch tube, the eighth switch tube, the first flying capacitor and the second flying capacitor;
the collector electrode of the first switching tube is connected with the positive electrode of the direct-current side bus; the emitter of the first switching tube is connected with the collector of the second switching tube and the first end of the first flying capacitor; the emitter of the second switching tube is connected with the collector of the third switching tube and the collector of the seventh switching tube; the emitter of the third switching tube is connected with the collector of the fourth switching tube, the second end of the first flying capacitor and the first end of the second flying capacitor; the emitter of the fourth switching tube is connected with the collector of the fifth switching tube and the emitter of the eighth switching tube; the emitter of the fifth switching tube is connected with the collector of the sixth switching tube and the second end of the second flying capacitor; an emitter of the sixth switching tube is connected with a negative electrode of the direct-current side bus; and the emitter of the seventh switching tube is connected with the collector of the eighth switching tube.
2. The five-level energy storage inverter of claim 1, wherein the rated voltage of the first flying capacitor and the second flying capacitor are each one-fourth of the rated voltage of the dc side bus.
3. The five-level energy storage inverter of claim 1, wherein the first switching tube comprises a first insulated gate bipolar transistor and a second insulated gate bipolar transistor; the first insulated gate bipolar transistor and the second insulated gate bipolar transistor are connected in series.
4. The five-level energy storage inverter of claim 3, wherein the sixth switching tube comprises a third insulated gate bipolar transistor and a fourth insulated gate bipolar transistor; the third insulated gate bipolar transistor and the fourth insulated gate bipolar transistor are connected in series.
5. The five-level energy storage inverter of claim 4, wherein the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the third insulated gate bipolar transistor, and the fourth insulated gate bipolar transistor each have a voltage rating that is one-fourth of the voltage rating of the dc side bus.
6. The five-level energy storage inverter according to claim 1, wherein cut-off voltages of the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube, the seventh switching tube and the eighth switching tube are each a quarter of a rated voltage of the dc-side bus.
7. The five-level energy storage inverter of claim 1, further comprising three inductors, first ends of the three inductors being connected to emitters of the seventh switching tube of the first leg, the second leg, and the third leg, respectively; and the second ends of the three inductors are connected with the emitters of the seventh switching tubes of the fourth bridge arm.
8. The five-level energy storage inverter of claim 7, further comprising a capacitor, a first end of the capacitor being connected to a second end of the inductor; and the second end of the capacitor is connected with the emitter of the seventh switching tube of the fourth bridge arm.
9. The five-level energy storage inverter of claim 8, further comprising a resistor in series with the inductor; the resistor is connected in parallel with the capacitor.
10. The five-level energy storage inverter according to claim 1, wherein a total cut-off voltage of the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube, and the sixth switching tube is one half of a rated voltage of the dc-side bus.
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| US20130114321A1 (en) * | 2011-10-17 | 2013-05-09 | Huawei Technologies Co., Ltd. | Inverter topology circuit, inversion method and inverter |
| CN107276441A (en) * | 2017-07-18 | 2017-10-20 | 江苏固德威电源科技股份有限公司 | Striding capacitance five-electrical level inverter, phase-shifting control method and grid-connected power generation system |
| CN111064378A (en) * | 2020-01-10 | 2020-04-24 | 中国电力科学研究院有限公司 | Five-level hybrid neutral point clamped converter |
| CN116191916A (en) * | 2022-09-08 | 2023-05-30 | 山东大学 | Flying capacitor type three-phase five-level inverter and control method and system thereof |
| CN116436329A (en) * | 2023-05-10 | 2023-07-14 | 苏州大学 | Three-phase four-bridge arm hybrid seven-level energy storage converter |
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| US20130114321A1 (en) * | 2011-10-17 | 2013-05-09 | Huawei Technologies Co., Ltd. | Inverter topology circuit, inversion method and inverter |
| CN107276441A (en) * | 2017-07-18 | 2017-10-20 | 江苏固德威电源科技股份有限公司 | Striding capacitance five-electrical level inverter, phase-shifting control method and grid-connected power generation system |
| CN111064378A (en) * | 2020-01-10 | 2020-04-24 | 中国电力科学研究院有限公司 | Five-level hybrid neutral point clamped converter |
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