CN116526883A - Three-phase three-level four-bridge arm energy storage inverter and inverter system - Google Patents
Three-phase three-level four-bridge arm energy storage inverter and inverter system Download PDFInfo
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- CN116526883A CN116526883A CN202310551094.0A CN202310551094A CN116526883A CN 116526883 A CN116526883 A CN 116526883A CN 202310551094 A CN202310551094 A CN 202310551094A CN 116526883 A CN116526883 A CN 116526883A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 31
- 230000007935 neutral effect Effects 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 40
- 230000005669 field effect Effects 0.000 claims description 3
- XZKIHKMTEMTJQX-UHFFFAOYSA-N 4-Nitrophenyl Phosphate Chemical group OP(O)(=O)OC1=CC=C([N+]([O-])=O)C=C1 XZKIHKMTEMTJQX-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- AZLYZRGJCVQKKK-UHFFFAOYSA-N dioxohydrazine Chemical group O=NN=O AZLYZRGJCVQKKK-UHFFFAOYSA-N 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- SSURCGGGQUWIHH-UHFFFAOYSA-N NNON Chemical group NNON SSURCGGGQUWIHH-UHFFFAOYSA-N 0.000 description 1
- VXQQVDCKACIRQG-UHFFFAOYSA-N NNPP Chemical group NNPP VXQQVDCKACIRQG-UHFFFAOYSA-N 0.000 description 1
- VMXJCRHCUWKQCB-UHFFFAOYSA-N NPNP Chemical group NPNP VMXJCRHCUWKQCB-UHFFFAOYSA-N 0.000 description 1
- XABBWGWLMBYJGI-UHFFFAOYSA-N NPPN Chemical group NPPN XABBWGWLMBYJGI-UHFFFAOYSA-N 0.000 description 1
- RSPISYXLHRIGJD-UHFFFAOYSA-N OOOO Chemical group OOOO RSPISYXLHRIGJD-UHFFFAOYSA-N 0.000 description 1
- GEJCIRQLMVVEDX-UHFFFAOYSA-N OOPO Chemical group OOPO GEJCIRQLMVVEDX-UHFFFAOYSA-N 0.000 description 1
- SKBLJQADGZYMKA-UHFFFAOYSA-N OPOP Chemical group OPOP SKBLJQADGZYMKA-UHFFFAOYSA-N 0.000 description 1
- DWDGSKGGUZPXMQ-UHFFFAOYSA-N OPPO Chemical group OPPO DWDGSKGGUZPXMQ-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- JLHBAYXOERKFGV-UHFFFAOYSA-N bis(4-nitrophenyl) phenyl phosphate Chemical group C1=CC([N+](=O)[O-])=CC=C1OP(=O)(OC=1C=CC(=CC=1)[N+]([O-])=O)OC1=CC=CC=C1 JLHBAYXOERKFGV-UHFFFAOYSA-N 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- UAJUXJSXCLUTNU-UHFFFAOYSA-N pranlukast Chemical group C=1C=C(OCCCCC=2C=CC=CC=2)C=CC=1C(=O)NC(C=1)=CC=C(C(C=2)=O)C=1OC=2C=1N=NNN=1 UAJUXJSXCLUTNU-UHFFFAOYSA-N 0.000 description 1
- 229960004583 pranlukast Drugs 0.000 description 1
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Classifications
-
- 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
- H02M7/53871—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 with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The application provides a three-phase three-level four bridge arm energy storage dc-to-ac converter and inverting system, the dc-to-ac converter includes: the three-phase three-level four-bridge arm circuit comprises four power electronic switching tubes, each bridge arm in the three-phase three-level four-bridge arm circuit comprises two power electronic switching tubes, and on one hand, the four bridge arms provide a branch as a neutral point to enable the inverter to carry unbalanced load; on the other hand, the inverter of the application utilizes twelve power electronic switching tubes in total, so that the number of the power electronic switching tubes can be reduced, and the problems of increasing the weight and the volume of the inverter device can be solved.
Description
Technical Field
The application relates to the field of power electronics and electric energy conversion, in particular to a three-phase three-level four-bridge arm energy storage inverter and an inversion system.
Background
Three-phase inverter for equipment of high-power inverter power supply for electric power, such as: renewable energy power generation, electric drive and the like, and it is important to ensure stability and reliability of the inverter as an interface between a load and renewable energy, and compared with a two-level inverter, the current and current harmonic content output by the multi-level inverter are less.
The multi-level energy storage inverter can be divided into neutral point clamping type, flying capacitor type, cascade H bridge and other structures; the neutral point clamping type multi-level inverter uses clamping diodes to maintain neutral point voltage, and the number of the clamping diodes is increased along with the increase of the level number; the flying capacitor type multi-level inverter uses the characteristic of capacitor voltage stabilization to keep the midpoint potential, but more capacitors are needed to be used along with the increase of the level; the cascaded H-bridge multilevel energy storage inverter requires the use of an isolated dc power supply.
Because of the three-phase symmetrical structure, the three-phase inverter can only carry three-phase balanced loads, and in practical application occasions, three-phase unbalanced loads often occur, and neutral point potentials can be actively balanced by utilizing single-phase half-bridge arms for the three-phase unbalanced loads, but correspondingly, the weight and the volume of the inverter device can be increased.
Disclosure of Invention
The application provides a three-phase three-level four-bridge arm energy storage inverter and an inversion system, which are used for solving the problem of increasing the weight and the volume of an inverter device.
In a first aspect, the present application provides a three-phase three-level four-leg energy storage inverter, comprising: the power supply circuit comprises an energy storage circuit and a three-phase three-level four-bridge arm circuit, wherein the energy storage circuit comprises a first power electronic switching tube, a second power electronic switching tube, a third power electronic switching tube and a fourth power electronic switching tube; the collector electrode of the first power electronic switching tube is connected with the positive electrode of the direct current power supply; the emitter of the first power electronic switching tube is connected with the collector of the second power electronic switching tube; an emitter of the second power electronic switching tube is connected with a collector of the third power electronic switching tube; an emitter of the third power electronic switching tube is connected with a collector of the fourth power electronic switching tube; an emitter of the fourth power electronic switching tube is connected with a negative electrode of the direct-current power supply; the three-phase three-level four-bridge arm circuit comprises a u-phase bridge arm, a v-phase bridge arm, a w-phase bridge arm and an f-phase bridge arm which are mutually connected in parallel, and each phase bridge arm comprises: a fifth power electronic switching tube and a sixth power electronic switching tube, the fifth power electronic switching tube being connected in series with the sixth power electronic switching tube; the collector electrode of the fifth power electronic switching tube is connected with the emitter electrode of the first power electronic switching tube; and the emitter of the sixth power electronic switching tube is connected with the collector of the fourth power electronic switching tube.
Optionally, the tank circuit further includes a first capacitor and a second capacitor; one end of the first capacitor is connected with the positive electrode of the direct current power supply, and the other end of the first capacitor is connected with the second capacitor; the other end of the second capacitor is connected with the negative electrode of the direct current power supply.
Optionally, the circuit further comprises a first filter circuit, wherein the u-phase bridge arm, the v-phase bridge arm and the w-phase bridge arm are all connected with a three-phase load through the first filter circuit.
Optionally, the first filter circuit includes a first filter inductor and a filter capacitor; the first end of the first filter inductor is connected with the collector electrodes of the fifth power electronic switching tube in the u-phase bridge arm, the v-phase bridge arm and the w-phase bridge arm, and the second end of the first filter inductor is connected with the three-phase load; the filter capacitor is connected in parallel with two ends of the three-phase load.
Optionally, the three-phase load further comprises a second filter inductor, and the three-phase load forms a neutral point; and the f-phase bridge arm is connected with the neutral point of the three-phase load through the second filter inductor.
Optionally, the first filter inductor and the second filter inductor are: any one or a combination of a plurality of LC filters, butterworth filters, chebyshev filters and Bessel filters.
Optionally, the output voltages of the u-phase bridge arm, the v-phase bridge arm and the w-phase bridge arm are respectively one of a first value, a second value and a third value, wherein the first value is 1/2 of the positive total input voltage, the second value is 0, and the third value is 1/2 of the negative total input voltage.
Optionally, the first power electronic switching tube, the second power electronic switching tube, the third power electronic switching tube, the fourth power electronic switching tube, the fifth power electronic switching tube and the sixth power electronic switching tube are: any one or a combination of a plurality of thyristors, power transistors, turn-off thyristors and power field effect transistors.
In a second aspect, the present application provides an inverter system, where the inverter system includes the three-phase three-level four-leg energy storage inverter of the first aspect.
According to the technical scheme, the application provides a three-phase three-level four-bridge arm energy storage inverter and an inverter system, wherein the inverter comprises: the three-phase three-level four-bridge arm circuit comprises four power electronic switching tubes, each bridge arm in the three-phase three-level four-bridge arm circuit comprises two power electronic switching tubes, and on one hand, the four bridge arms provide a branch as a neutral point to enable the inverter to carry unbalanced load; on the other hand, the inverter of the application utilizes twelve power electronic switching tubes in total, so that the number of the power electronic switching tubes can be reduced, and the problems of increasing the weight and the volume of the inverter device can be solved.
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 diagram of a three-phase three-level four-bridge arm energy storage inverter;
fig. 2 is an exemplary operating mode shutdown schematic.
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.
Compared with a two-level inverter, the three-phase inverter has one more level of output voltage, is closer to sine wave, can reduce harmonic content of the output voltage, reduces voltage stress of a power switch device, and improves capacity of direct-current bus voltage.
However, the three-phase inverter can only carry three-phase balanced loads due to the three-phase symmetrical structure, and can increase the capacitance value of a direct current bus aiming at the problem of unbalanced neutral point potential of the three-phase inverter, and inhibit the unbalanced neutral point potential by the rule that the deviation of the neutral point potential is inversely proportional to the capacitance value; hardware assist circuitry may also be employed to provide a path for neutral current, for example, a single phase half bridge arm actively balancing neutral potential. Therefore, a four-leg inverter is proposed, and the four-leg inverter can provide one leg as a neutral point, and the inverter can carry unbalanced load, but the weight and the volume of the inverter device are increased due to the addition of a unidirectional half-bridge leg.
To solve the above problems, referring to fig. 1, some embodiments of the present application provide a three-phase three-level four-bridge arm energy storage inverter, including: the power supply circuit comprises an energy storage circuit and a three-phase three-level four-bridge arm circuit, wherein the energy storage circuit comprises a first power electronic switching tube, a second power electronic switching tube, a third power electronic switching tube and a fourth power electronic switching tube; the collector electrode of the first power electronic switching tube is connected with the positive electrode of the direct current power supply; the emitter of the first power electronic switching tube is connected with the collector of the second power electronic switching tube; an emitter of the second power electronic switching tube is connected with a collector of the third power electronic switching tube; an emitter of the third power electronic switching tube is connected with a collector of the fourth power electronic switching tube; an emitter of the fourth power electronic switching tube is connected with a negative electrode of the direct-current power supply;
referring to fig. 1, the power electronic switching tube S in fig. 1 a1 The first power electronic switch tube is a power electronic switch tube S a2 Is a second power electronic switch tube, a power electronic switch tube S a3 The third power electronic switch tube is a power electronic switch tube S a4 The fourth power electronic switch tube; power electronic switching tube S a1 And power electronic switching tube S a2 Attached to P a1 Point, power electronic switching tube S a3 And power electronic switching tube S a4 To N a1 And (5) a dot.
The power electronic switching tube in the embodiment of the present application may be: any one or a combination of a plurality of thyristors, power transistors, turn-off thyristors, power field effect transistors, for example: power electronic switching tube S a1 Using power transistors, power electronic switching transistors S a2 Using a turn-off thyristor; for another example: power electronic switching tube S a1 And power electronic switching tube S a2 All use power transistors, other power electronic transistors and power electronic switch transistors S a1 And power electronic switching tube S a2 No distinction is made here and no further description is given here.
Further, in some embodiments, the tank circuit further includes a first capacitor and a second capacitor; one end of the first capacitor is connected with the positive electrode of the direct current power supply, and the other end of the first capacitor is connected with the second capacitor; the other end of the second capacitor is connected with the negative electrode of the direct current power supply. Referring again to FIG. 1, the first capacitance is C P The second capacitance is C N First capacitor C P And a second capacitor C N And power electronic switching tube S a1 And power electronic switching tube S a2 Is connected to the O-point.
The three-phase three-level four-bridge arm circuit is a u-phase bridge arm, a v-phase bridge arm, a w-phase bridge arm and an f-phase bridge arm which are mutually connected in parallel, and each phase bridge arm comprises: a fifth power electronic switching tube and a sixth power electronic switching tube, the fifth power electronic switching tube being connected in series with the sixth power electronic switching tube; the collector of the fifth power electronic switching tube is connected with the emitter of the first power electronic switching tube; the emitter of the sixth power electronic switching tube is connected with the collector of the fourth power electronic switching tube.
Exemplary, referring to FIG. 1, the u-phase leg includes a power electronic switching tube S u1 Power electronic switching tube S u2 Power electronic switching tube S u1 And power electronic switching tube S u2 Series connection of power electronic switching tubes S u1 Collector and P of (2) a1 Point connection; power electronic switching tube S u2 Emitter and N of (2) a1 And (5) point connection.
v-phase bridge arm comprises a power electronic switch tube S v1 Power electronic switching tube S v2 Power electronic switching tube S v1 And power electronic switching tube S v2 Series connection of power electronic switching tubes S v1 Collector and P of (2) a1 Point connection; power electronic switching tube S v2 Emitter and N of (2) a1 And (5) point connection.
The w-phase bridge arm comprises a power electronic switch tube S w1 Power electronic switching tube S w2 Power electronic switching tube S w1 And power electronic switching tube S w2 Series connection of power electronic switching tubes S w1 Collector at P of (C) a1 Point connection; power electronic switching tube S w2 Emitter and N of (2) a1 And (5) point connection.
The f-phase bridge arm comprises a power electronic switch tube S f1 Power electronic switching tube S f2 Power electronic switching tube S f1 And power electronic switching tube S f2 Series connection of power electronic switching tubes S f1 Collector at P of (C) a1 Point connection; power electronic switching tube S f2 Emitter and N of (2) a1 And (5) point connection.
Can work after connection is completed, an exemplary oneMode, see FIG. 2, when the power electronic switching tube S a1 Power electronic switching tube S a3 Power electronic switching tube S u1 Power electronic switching tube S v1 Power electronic switching tube S w2 Power electronic switching tube S f2 On, power electronic switching tube S a2 Power electronic switching tube S a4 Power electronic switching tube S u2 Power electronic switching tube S v2 Power electronic switching tube S w1 Power electronic switching tube S f1 When turned off, the first capacitor C P A second capacitor C N And the direct current bus voltage is evenly divided, and at the moment, the output voltages of the u-phase bridge arm and the v-phase bridge arm are 1/2,w-phase bridge arm and the f-phase bridge arm of the total output voltage and are 0.
The inverter disclosed by the application utilizes twelve power electronic switching tubes in total, and compared with other three-phase three-level four-bridge-arm inverters, the three-phase three-level four-bridge-arm inverter can realize the functions of the three-phase three-level four-bridge-arm inverter, and the size and the weight of the inverter are reduced.
To suppress excessive ripple of the circuit, in some embodiments, the u-phase bridge arm, the v-phase bridge arm, and the w-phase bridge arm are all connected to a three-phase load through a first filter circuit, where the first filter circuit includes a first filter inductance and a filter capacitance; the first end of the first filter inductor is connected with the collector electrodes of the fifth power electronic switching tubes in the u-phase bridge arm, the v-phase bridge arm and the w-phase bridge arm, and the second end of the first filter inductor is connected with the three-phase load; the filter capacitor is connected in parallel with two ends of the three-phase load. The first filter inductor is a filter capacitor L, and the filter capacitor is a filter capacitor C.
The first filter circuit can filter out high-frequency current components generated by the switching action, and the first filter inductor can control the amplitude and the phase of grid-connected current, so that the power output of the inverter is controlled, reactive power can be transmitted to a power grid as required, and the net-side pure inductor and pure capacitor operation characteristics are realized.
To increase the neutral point potential, in some embodiments, the three-phase load forms a neutral point; and the f-phase bridge arm is connected with a three-phase load neutral point through a second filter inductor. Wherein the second filter inductance is a filter capacitance L n Filter capacitor L n Any one of a ceramic capacitor, a polyester capacitor, a polystyrene capacitor, and a polypropylene capacitor may be selected, for example: filter capacitor L n Polystyrene capacitors were selected. In some embodiments, the first filter inductance and the second filter inductance are: any one or a combination of a plurality of LC filters, butterworth filters, chebyshev filters and Bessel filters.
The bridge arm voltage outputs three states, compared with a two-level inverter, the harmonic content of the output voltage can be reduced, namely in some embodiments, the u-phase bridge arm, the v-phase bridge arm and the w-phase bridge arm output voltages are respectively one of a first value, a second value and a third value, wherein the first value is 1/2 of the total positive input voltage, the second value is 0, and the third value is 1/2 of the total negative input voltage. For example: the first value may be expressed as +V dc A second value of 0 may be expressed as V and a third value may be expressed as V dc /2. For example: when the output voltage is +V dc When the output voltage is 0, the working state is defined as O state, and when the output voltage is-V dc When the working state is defined as the N state, forty-five working modes are adopted:
if the power electronic switching tube is turned on by 1 and turned off by 0, the working mode can be seen in table 1;
table 1 table of modes of operation
When in the mode 1, the working state of the device is PPPP, and the output voltages of the four bridge arms are +V dc /2。
When in mode 2, the working state of the device is PPPO, and the output voltages of the u-phase bridge arm, the V-phase bridge arm and the w-phase bridge arm are +V dc And the output voltage of the f-phase bridge arm is 0.
When in mode 3, the working state of the device is PPOP, and the output voltages of the u-phase bridge arm, the V-phase bridge arm and the f-phase bridge arm are +V dc The output voltage of the/2,w phase bridge arm is 0.
When in mode 4, the working state of the device is PPOO, and the output voltages of the u-phase bridge arm and the V-phase bridge arm are +V dc The output voltage of the/2,w phase arm and the f phase arm is 0.
When in mode 5, the working state of the device is POPP, and the output voltages of the u-phase bridge arm, the w-phase bridge arm and the f-phase bridge arm are +V dc And the output voltage of the v-phase bridge arm is 0.
When in mode 6, the working state of the device is POPO, and the output voltages of the u-phase bridge arm and the w-phase bridge arm are +V dc And the output voltage of the v-phase bridge arm and the f-phase bridge arm is 0.
When in mode 7, the working state of the device is POOP, and the output voltages of the u-phase bridge arm and the f-phase bridge arm are +V dc And the output voltage of the v-phase bridge arm and the w-phase bridge arm is 0.
When in the mode 8, the working state of the device is POOO, and the output voltages of the u-phase bridge arms are +V dc And the output voltage of the v-phase bridge arm, the w-phase bridge arm and the f-phase bridge arm is 0.
When in the mode 9, the working state of the device is OOOO, and the output voltages of the four bridge arms are all 0.
When in the mode 10, the working state of the device is OOOP, and the output voltage of the f-phase bridge arm is +V dc The output voltages of the/2,u phase bridge arm, the v phase bridge arm and the w phase bridge arm are all 0.
When in mode 11, the working state of the device is OOPO, the output voltages of the u-phase bridge arm, the V-phase bridge arm and the f-phase bridge arm are 0,w-phase bridge arm, and the output voltage is +V dc /2。
When in mode 12, the working state of the device is OOPP, the output voltages of the u-phase bridge arm and the V-phase bridge arm are 0,w-phase bridge arm and the output voltage of the f-phase bridge arm are +V dc /2。
When in mode 13, the working state of the device is OPOO, the output voltages of the u-phase bridge arm, the w-phase bridge arm and the f-phase bridge arm are all 0, and the output voltage of the V-phase bridge arm is +V dc /2。
When in mode 14, the working state of the device is OPOP, the output voltages of the V-phase bridge arm and the w-phase bridge arm are 0, and the output voltages of the V-phase bridge arm and the f-phase bridge arm are +V dc /2。
When in the mode 15, the working state of the device is OPPO, the output voltages of the u-phase bridge arm and the f-phase bridge arm are 0, and the output voltages of the V-phase bridge arm and the w-phase bridge arm are +V dc /2。
When in the mode 16, the working state of the device is OPPP, and the output voltages of the V-phase bridge arm, the w-phase bridge arm and the f-phase bridge arm are +V dc The output voltage of the/2,u phase bridge arm is 0.
When in the mode 17, the working state of the device is OOON, the output voltages of the u-phase bridge arm, the V-phase bridge arm and the w-phase bridge arm are all 0, and the output voltage of the f-phase bridge arm is-V dc /2。
When in the mode 18, the working state of the device is OONO, and the output voltages of the u-phase bridge arm, the V-phase bridge arm and the f-phase bridge arm are 0,w-phase bridge arm, and are-V dc /2。
When in the mode 19, the working state of the device is OONN, the output voltages of the u-phase bridge arm and the V-phase bridge arm are 0,w-phase bridge arm and the output voltage of the f-phase bridge arm are-V dc /2。
When in the mode 20, the working state of the device is ONOO, the output voltages of the u-phase bridge arm, the w-phase bridge arm and the f-phase bridge arm are all 0, and the output voltage of the V-phase bridge arm is-V dc /2。
When in mode 21, the working state of the device is ONON, the output voltages of the u-phase bridge arm and the w-phase bridge arm are 0, and the output voltages of the V-phase bridge arm and the f-phase bridge arm are-V dc /2。
When in the mode 22, the working state of the device is ONNO, the output voltages of the u-phase bridge arm and the f-phase bridge arm are 0, and the output voltages of the v-phase bridge arm and the w-phase bridge arm are 0The output voltage is-V dc /2。
When in mode 23, the working state of the device is ONNN, the output voltage of the u-phase bridge arm is 0, the output voltages of the V-phase bridge arm, the w-phase bridge arm and the f-phase bridge arm are-V dc /2。
When in the mode 24, the working state of the device is OOON, the output voltages of the V-phase bridge arm, the w-phase bridge arm and the f-phase bridge arm are all 0, and the output voltage of the u-phase bridge arm is-V dc /2。
When in mode 25, the working state of the device is ONNO, the output voltages of the V-phase bridge arm and the w-phase bridge arm are 0, and the output voltages of the u-phase bridge arm and the f-phase bridge arm are-V dc /2。
When in the mode 26, the working state of the device is NONO, the output voltages of the V-phase bridge arm and the f-phase bridge arm are 0, and the output voltages of the u-phase bridge arm and the w-phase bridge arm are-V dc /2。
When in the mode 27, the working state of the device is NONN, the output voltage of the V-phase bridge arm is 0, and the output voltages of the f-phase bridge arm, the u-phase bridge arm and the w-phase bridge arm are-V dc /2。
When in the mode 28, the working state of the device is NNOO, the output voltages of the w-phase bridge arm and the f-phase bridge arm are 0, and the output voltages of the u-phase bridge arm and the V-phase bridge arm are-V dc /2。
When in the mode 29, the working state of the device is NNON, the output voltage of the w-phase bridge arm is 0, the output voltages of the u-phase bridge arm, the V-phase bridge arm and the f-phase bridge arm are-V dc /2。
When in the mode 30, the working state of the device is NNNO, the output voltage of the f-phase bridge arm is 0, and the output voltages of the u-phase bridge arm, the V-phase bridge arm and the w-phase bridge arm are-V dc /2。
When in the mode 31, the working state of the device is NNNN, and the output voltages of the four bridge arms are all-V dc /2。
When in the mode 32, the working state of the device is NNNP, and the output voltages of the u-phase bridge arm, the V-phase bridge arm and the w-phase bridge arm are all-V dc Output voltage of the/2, f-phase bridge arm is +V dc /2。
When in the mode 33, the working state of the device is NNPN, and the output voltages of the u-phase bridge arm, the V-phase bridge arm and the f-phase bridge arm are all-V dc Output voltage of/2,w phase bridge arm is +V dc /2。
When in the mode 34, the working state of the device is NNPP, and the output voltages of the u-phase bridge arm and the V-phase bridge arm are both-V dc Output voltage of/2,w phase bridge arm and f phase bridge arm is +V dc /2。
When in the mode 35, the working state of the device is NPNN, and the output voltages of the u-phase bridge arm, the w-phase bridge arm and the f-phase bridge arm are all-V dc Output voltage of the V-phase bridge arm is +V dc /2。
When in the mode 36, the working state of the device is NPNP, and the output voltages of the u-phase bridge arm and the w-phase bridge arm are-V dc Output voltage of the/2, V-phase bridge arm and the f-phase bridge arm is +V dc /2。
When in the mode 37, the working state of the device is NPPN, and the output voltages of the u-phase bridge arm and the f-phase bridge arm are both-V dc Output voltage of the/2, V-phase bridge arm and the w-phase bridge arm is +V dc /2。
When in the mode 38, the working state of the device is NPPP, and the output voltage of the u-phase bridge arm is-V dc Output voltages of the V-phase bridge arm, the w-phase bridge arm and the f-phase bridge arm are +V dc /2。
When in the mode 39, the working state of the device is PNNN, and the output voltages of the V-phase bridge arm, the w-phase bridge arm and the f-phase bridge arm are all-V dc Output voltage of/2,u phase bridge arm is +V dc /2。
When in the mode 40, the working state of the device is PNNP, and the output voltages of the V-phase bridge arm and the w-phase bridge arm are-V dc Output voltage of/2,u phase bridge arm and f phase bridge arm is +V dc /2。
When in mode 41, the working state of the device is PNPN, and the output voltages of the V-phase bridge arm and the f-phase bridge arm are V dc Output voltage of/2,u phase bridge arm and w phase bridge arm is +V dc /2。
When in the mode 42, the working state of the device is PNPP, and the output voltage of the V-phase bridge arm is-V dc Output voltages of the/2,u phase bridge arm, the w phase bridge arm and the f phase bridge arm are all +V dc /2。
When in the mode 43, the working state of the device is PPNN, and the output voltages of the w-phase bridge arm and the f-phase bridge arm are-V dc Output voltages of the/2,u phase bridge arm and the V phase bridge arm are +V dc /2。
When in the mode 44, the working state of the device is PPNP, and the output voltage of the w-phase bridge arm is-V dc Output voltages of the/2,u phase bridge arm, the V phase bridge arm and the f phase bridge arm are all +V dc /2。
When in the mode 45, the working state of the device is PPPN, and the output voltage of the f-phase bridge arm is-V dc Output voltages of the/2,u phase bridge arm, the V phase bridge arm and the w phase bridge arm are all +V dc /2。
Based on the three-phase three-level four-bridge arm energy storage inverter, some embodiments of the application also provide an inversion system, and the inversion system comprises the three-phase three-level four-bridge arm energy storage inverter.
As can be seen from the above technical solutions, this embodiment provides a three-phase three-level four-bridge arm energy storage inverter and an inverter system, the inverter includes: the three-phase three-level four-bridge arm circuit comprises four power electronic switching tubes, and each bridge arm in the three-phase three-level four-bridge arm circuit comprises two power electronic switching tubes; on the other hand, the inverter of the application utilizes twelve power electronic switching tubes in total, so that the number of the power electronic switching tubes can be reduced, and the problems of increasing the weight and the volume of the inverter device are solved.
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 (9)
1. A three-phase three-level four-leg energy storage inverter, comprising: the energy storage circuit, the three-phase three-level four-bridge arm circuit, wherein,
the energy storage circuit comprises a first power electronic switching tube, a second power electronic switching tube, a third power electronic switching tube and a fourth power electronic switching tube;
the collector electrode of the first power electronic switching tube is connected with the positive electrode of the direct current power supply; the emitter of the first power electronic switching tube is connected with the collector of the second power electronic switching tube;
an emitter of the second power electronic switching tube is connected with a collector of the third power electronic switching tube;
an emitter of the third power electronic switching tube is connected with a collector of the fourth power electronic switching tube;
an emitter of the fourth power electronic switching tube is connected with a negative electrode of the direct-current power supply;
the three-phase three-level four-bridge arm circuit comprises a u-phase bridge arm, a v-phase bridge arm, a w-phase bridge arm and an f-phase bridge arm which are mutually connected in parallel, and each phase bridge arm comprises:
a fifth power electronic switching tube and a sixth power electronic switching tube, the fifth power electronic switching tube being connected in series with the sixth power electronic switching tube;
the collector electrode of the fifth power electronic switching tube is connected with the emitter electrode of the first power electronic switching tube;
and the emitter of the sixth power electronic switching tube is connected with the collector of the fourth power electronic switching tube.
2. The three-phase three-level four-leg energy storage inverter of claim 1, wherein the energy storage circuit further comprises a first capacitor and a second capacitor;
one end of the first capacitor is connected with the positive electrode of the direct current power supply, and the other end of the first capacitor is connected with the second capacitor;
the other end of the second capacitor is connected with the negative electrode of the direct current power supply.
3. The three-phase three-level four-leg energy storage inverter of claim 1, further comprising a first filter circuit, wherein the u-phase leg, the v-phase leg, and the w-phase leg are all connected to a three-phase load through the first filter circuit.
4. The three-phase three-level four-leg energy storage inverter of claim 3, wherein the first filter circuit comprises a first filter inductance and a filter capacitance;
the first end of the first filter inductor is connected with the collector electrodes of the fifth power electronic switching tube in the u-phase bridge arm, the v-phase bridge arm and the w-phase bridge arm, and the second end of the first filter inductor is connected with the three-phase load;
the filter capacitor is connected in parallel with two ends of the three-phase load.
5. The three-phase three-level four-leg energy storage inverter of claim 4, further comprising a second filter inductance, the three-phase load forming a neutral point; and the f-phase bridge arm is connected with the neutral point of the three-phase load through the second filter inductor.
6. The three-phase three-level four-leg energy storage inverter of claim 5, wherein the first filter inductance and the second filter inductance are: any one or a combination of a plurality of LC filters, butterworth filters, chebyshev filters and Bessel filters.
7. The three-phase three-level four-leg energy storage inverter of claim 1, wherein the u-phase leg, the v-phase leg, and the w-phase leg output voltages are each one of a first value that is 1/2 of a positive total input voltage, a second value that is 0, and a third value that is 1/2 of a negative total input voltage.
8. The three-phase three-level four-leg energy storage inverter according to claim 1, wherein the first power electronic switching tube, the second power electronic switching tube, the third power electronic switching tube, the fourth power electronic switching tube, the fifth power electronic switching tube, and the sixth power electronic switching tube are: any one or a combination of a plurality of thyristors, power transistors, turn-off thyristors and power field effect transistors.
9. An inverter system comprising the three-phase three-level four-leg energy storage inverter of any one of claims 1-8.
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