CN116746048A - Inverter for an alternating current system - Google Patents
Inverter for an alternating current system Download PDFInfo
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- CN116746048A CN116746048A CN202180091827.6A CN202180091827A CN116746048A CN 116746048 A CN116746048 A CN 116746048A CN 202180091827 A CN202180091827 A CN 202180091827A CN 116746048 A CN116746048 A CN 116746048A
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- inverter
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- 230000005540 biological transmission Effects 0.000 claims description 34
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 230000010355 oscillation Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
- H02M7/483—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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Inverter for an alternating current system, in particular a three-phase system, comprising two or more phases (U, V, W), wherein for each phase (U, V, W) one arm (13) or two arms (1, 2) are provided, said arms having inverter modules (5) connected in series and having phase connections (3), and each arm (1, 2, 13) of one phase (U, V, W) is connected to a respective arm (1, 2, 13) of each other phase (U, V, W) by means of an electrically conductive connection (4) having a uniform potential. For each arm (1, 2, 13) of one phase (U, V, W), the inverter module (5) connected to the conductive connection (4) is connected to a compensation unit (10) which allows energy transfer between said arm (1, 2, 13) of said one phase (U, V, W) and the arms (1, 2, 13) of the other phase (U, V, W).
Description
Technical Field
The invention relates to an inverter for an alternating current system, in particular a three-phase system, comprising two or more phases, wherein one or two limbs are provided for each phase, said limbs having inverter modules connected in series and having phase connections, and each limb of one phase is connected to a corresponding limb of each other phase by means of an electrically conductive connection having a uniform potential. The inverter modules each have a capacitor.
The invention also relates to a method for operating such an inverter and to a three-phase machine (in particular an electric motor) or a mains supply, i.e. a device for feeding current into a mains, having at least one inverter.
Background
In drive technology, a controlled three-phase motor is supplied with power at low and medium voltages by an inverter, which is usually designed as an intermediate circuit voltage inverter. The undesirable harmonic oscillations produced by these inverters depend on the switching frequency of the power semiconductors and the number of switchable voltage levels. Furthermore, each commutation of the power semiconductor produces a voltage switching edge. These switching edges increase the load on the insulation of the motor stator windings and the load on the motor cables. Typically, a voltage in the medium voltage range is provided for a motor of greater power, for which the associated inverter must likewise be designed in medium voltage. In the case of a two-level inverter, the power semiconductors must have a correspondingly high reverse voltage, which limits the choice of power semiconductors. Furthermore, power semiconductors with higher reverse voltages generate much higher switching losses than with lower reverse voltages, whereby the switching frequency that can be economically achieved is significantly limited. To solve this problem, an inverter having a plurality of dc intermediate circuits is used in medium voltage and low voltage. The individual power semiconductors can thus be controlled in a staggered manner and a better modulation of the ac voltage is achieved. Widely used inverter variants are three-level NPC inverters and three-level NPP inverters.
Multilevel topologies, such as cascaded H-bridge topologies (US 6014323) and marqwards MMC topologies (ETG conference 2002), use scalable series connections of inverter modules with their own intermediate circuit capacitors supporting the module intermediate circuit dc voltage. The multi-stage topology provides the advantage that the reverse voltage requirements of the individual power semiconductors are reduced and thus the switching losses are reduced, thereby enabling higher frequencies.
According to the prior art, the inverter module is formed by a power semiconductor device (which is designed in particular as an IGBT or IGCT) and a capacitor. These capacitors are essentially designed for the maximum expected pulsating fundamental oscillation power of the photograph.
According to the prior art, in the case of small frequencies and large energies, the intermediate circuit voltage in the phases is caused to pulsate significantly by the inverter module. This causes a load on the inverter module due to the pulsating power of each phase. In order to be able to operate even at low output powers, an additional circuit current is produced, which reduces the load on the intermediate circuit. However, this additionally increases the load of the power semiconductor and reduces the available output current. In applications requiring a high starting torque, or in applications in which the rotational speed is low for a long time in a certain operating mode, or in applications in which the electrical machine has a small nominal frequency, the intermediate circuit capacitor has to be designed significantly larger, due to the pulsating power of the phases, which increases the cost and the volume of the inverter and means an additional fire load.
Disclosure of Invention
The object of the present invention is to provide an inverter of the type mentioned at the outset, a method for operating such an inverter and a three-phase motor which do not have the abovementioned disadvantages, wherein the output power is increased and in particular the basic oscillation ripple of the intermediate circuit voltage is compensated/reduced, without increasing the load/load of the inverter module due to the circuit current, and therefore the use of smaller capacitors in the inverter module can be achieved. In particular to solve the balance problem of an intermediate circuit at low frequency.
According to the invention, this object is achieved by an inverter having the features of claim 1.
Furthermore, according to the invention, this object is also achieved by a method having the features of claim 13 and a three-phase motor or a mains supply having the features of claim 15.
Preferred and advantageous embodiments of the invention are the subject matter of the dependent claims.
Since the pulsating basic oscillation power in a multiphase system is phase shifted between the phases, the intermediate circuit capacitor is also loaded to a different extent in time sequence, while the sum of the pulsating basic oscillation powers is compensated for in a symmetrical operation. According to the invention, therefore, it is provided that for each arm of one phase, the inverter module connected to the electrically conductive connection is connected to a compensation unit which allows energy transfer between said arm of said one phase and the arms of the other phase. This allows energy compensation by energy transfer between the two phase inverter modules.
It is provided within the scope of the invention for the capacitors of the inverter module arranged furthest from the phase connection to be connected directly to the electrically conductive connection for each arm of one phase and to be connected to a compensation unit which allows energy transfer between the arm of the one phase and one arm of the other phase. It is therefore provided within the scope of the invention that the capacitor of the inverter module arranged furthest from the phase connection is connected directly to the electrically conductive connection and to a compensation unit on one arm of at least one phase and energy is transferred via the compensation unit to one arm of the other phase.
It is thereby achieved that the power ripple of one phase can be compensated with one other phase, since the ripple power is transferred from the inverter module of at least one phase via an electrical compensation unit to the corresponding inverter module of one other phase, whereby the load to which the intermediate circuit capacitor is subjected becomes smaller, so that it can be designed smaller. In addition, loop current for reducing power ripple can also be reduced, thereby reducing the load on the power semiconductors and optimizing the available output current.
In a preferred embodiment, it is provided that for each arm of a phase, the inverter module which is arranged furthest from the phase connection is connected to the compensation unit. This inverter module is usually connected to an electrically conductive connection having a uniform potential in the actual inverter concerned, so that the invention can thus be easily applied to an actual inverter of importance.
In at least one arm, preferably in all arms, at least one transmission unit is advantageously provided, which allows load current/load current independent energy transfer between one inverter module of the arm and at least one other inverter module of the same arm. Preferably, the transmission unit is configured such that it allows load-current-independent energy transfer between one inverter module of the arm and at least one other inverter module of the same arm connected to the compensation unit. Therefore, in addition to the inverter modules connected to the compensation unit, the pulsating basic oscillating power of the other inverter modules of the same arm can be reduced, so that the intermediate circuit capacitors of these inverter modules can also be reduced. For this purpose, in a preferred embodiment, a transmission control system is provided which controls the energy transfer independently of the load current.
In particular, it can be provided within the scope of the invention that the inverter modules in at least one arm, preferably in all arms, are each connected to a transmission unit. Thus, energy compensation can be performed by all inverter modules within one phase.
The transmission unit is advantageously designed as a voltage transformer (voltage transformer) which enables efficient energy transfer.
According to a preferred embodiment of the invention, the transmission control system controls/coordinates the energy transfer between the two inverter modules in dependence on the load state of the inverter modules, in particular also in dependence on the switching state of the inverter modules, such that the desired energy transfer to the inverter modules does not negatively affect the operation of the inverter. Furthermore, this has a beneficial effect on reducing power ripple in one phase.
The transmission control system is preferably connected to the respective transmission unit.
Within the scope of the invention, one arm is provided for each phase, wherein the electrically conductive connection is a star junction. This is especially the case in cascaded H-bridge topologies. In this case, it is preferred here that the compensation unit is a star junction with an inverter, in particular with at least one central intermediate circuit.
As a further alternative, within the scope of the invention, one negative pole arm and one positive pole arm may be provided for each phase, wherein the electrically conductive connection between the positive pole arms of the phases is a common positive pole connection, in particular a positive pole busbar, and the electrically conductive connection between the negative pole arms of the phases is a common negative pole connection, in particular a negative pole busbar.
In a preferred development, the compensation unit is a parallel circuit between the respective inverter modules of the two phases, in particular a parallel circuit of intermediate circuit capacitors of the inverter modules of the two phases.
Drawings
Further characteristics and advantages of the invention will be obtained from the following description of preferred, but not limiting, embodiments of the invention with reference to the related drawings. Wherein:
fig. 1 shows a circuit diagram of a three-phase MMC inverter according to the prior art;
fig. 2 to 5 show circuit diagrams of an MMC inverter according to the present invention;
fig. 6 shows a circuit diagram of a three-phase cascaded H-bridge inverter according to the prior art;
fig. 7 to 9 show circuit diagrams of a cascaded H-bridge inverter according to the invention, and
fig. 10 shows a configuration of a three-phase motor, an inverter unit and a power grid.
Detailed Description
A circuit diagram of a conventional MMC inverter for three phases U, V, W is shown in fig. 1. For each phase U, V, W, two arms 1,2 are provided with one phase joint 3. Each phase connection 3 is connected via two arms 1,2 to a uniform positive or negative potential conductive connection 4. Each arm 1,2 of the phase U, V, W is connected to a respective arm 1,2 of each other phase U, V, W via a conductive connection 4 having a uniform potential. The conductive connection 4 between the positive arms 1 and the conductive connection 4 between the negative arms 2 are in this case positive or negative busbars (Vdc/2 and-Vdc/2). In this embodiment, each arm 1,2 is formed by a plurality of inverter modules 5 having capacitors K connected in series with each other. The energy transfer is controlled by an inverter control system 7.
In fig. 2, a circuit diagram of the MMC inverter for three-phase U, V, W of the present invention is shown, which has the following differences in characteristics from the conventional inverter.
As a transmission unit 8, a voltage transformer is provided in all the limbs 1,2, which voltage transformer allows additional energy transfer between the inverter module 5 of one limb 1,2 and the other inverter modules 5 of the same limb 1, 2. A transmission control system 9 connected to the transmission unit 8 controls the additional energy transfer independently of the energy transfer occurring by a possible circuit current, however depending on the load state of the respective inverter module 5. The structure of the transmission unit 8 need not be identical here.
For each arm 1,2 of one phase U, V, W, the inverter module 5 connected to the conductive connection 4 is connected to a compensation unit 10 which allows energy transfer between the arm 1,2 of the one phase U, V, W and the arms 1,2 of the other phase U, V, W. This is a modification of the conventional MMC circuit that allows compensation of power ripple without the need for loop current. In particular, the intermediate circuit capacitors K of the uppermost and lowermost inverter modules 5, which are arranged furthest from the phase connection 3, are connected to one another, and these intermediate circuit capacitors are connected directly to the bus bars (Vdc/2 and-Vdc/2). This is possible because the inverter modules 5 always have the same potential on one side by being commonly connected to the bus. The compensation unit 10 electrically connects intermediate circuits of the respective uppermost and lowermost inverter modules 5 to each other. Thereby compensating for the pulsating line.
The compensation units 10 on the uppermost and lowermost inverter modules 5 alone do not change the load of the remaining inverter modules 5. However, a path is created through this connection that allows for compensation of inter-phase power ripple as directly as possible. The inverter modules 5, which are not directly connected to the compensation unit 10, are thus relieved of power pulsations by the transmission units 8, since the transmission units 8 transfer energy to the compensation unit.
The inverter shown in fig. 3 corresponds substantially to the inverter shown in fig. 2. In this case, the energy transfer from the respective intermediate circuit capacitor K to the respective higher intermediate circuit capacitor K is effected by means of a regulator which is connected by induction to the next inverter module 5. This transmission must be coordinated with the switching state of the higher-level inverter module 5 so that the current stored in the sense does not flow through the upper capacitor. The transmission control system 9 connected to the transmission unit 8 controls the additional energy transfer independently of the energy transfer occurring by a possible circuit current, however depending on the load state and the switching state of the respective inverter module 5.
The inverter shown in fig. 4 corresponds substantially to the inverter shown in fig. 2 and 3, however without the transmission unit 8 and without the transmission control system 9.
In the inverter according to fig. 5, the solution of the transmission means 8 of the arms 1,2 is constituted by H-bridges connected to each other by an intermediate frequency transformer. Due to the increased frequency, the transformer is much smaller than a conventional 50Hz transformer. This circuit has the advantage that it can also operate in resonance and thus the semiconductor switches with little loss at the zero crossing of the current. All H-bridges of a transformer are synchronized with each other by voltage. If the insulation voltage of the transformer is insufficient for all inverter modules 5 or the transformer costs too much, an additional transformer is connected in series. Depending on the implementation, transformers with more or fewer winding systems may be used. This embodiment is applicable to each arm 1,2, 13 of the circuit according to fig. 2 and 7, wherein the transmission means 8 connected to the compensation unit 4 are slightly different from the other transmission means 8 of the arm. The solution can thus be considered for two-phase systems or three-phase systems.
Fig. 6 shows a circuit diagram of a three-phase cascade H-bridge inverter. Each phase U, V, W is provided with an arm 13 having a phase connector 3. Each phase connection 3 is connected via the arm 13 to a conductive connection 4 of uniform potential. Each arm 13 of phase U, V, W is connected to the arm 13 of each other phase U, V, W via a conductive connection 4 having a uniform potential. The conductive connection 4 is in this case designed as a star junction. In this embodiment, each arm 13 is formed by a plurality of inverter modules 5 having capacitors K connected in series with each other. The energy transfer is controlled by an inverter control system 7.
In fig. 7 and 8, a circuit diagram of a three-phase cascaded H-bridge inverter of the invention is shown, which inverter differs from a conventional inverter in the following features.
In all the arms 13, a voltage transformer is provided as the transmission unit 8, which voltage transformer allows an additional energy transfer between one inverter module 5 of one arm 13 and the other inverter modules 5 of the same arm 13. A transmission control system 9 connected to the transmission unit 8 controls the additional energy transfer independently of the load current of the respective inverter module 5, however depending on the load state of the inverter module and optionally also depending on or independently of the respective switching state.
For each arm 13 of one phase U, V, W, the inverter module 5 connected to the conductive connection 4, 14 is connected to a compensation unit 10 which allows energy transfer between the arm 13 of said one phase U, V, W and the arms 13 of the other phase U, V, W. In particular, for each arm 13 of one phase U, V, W, the capacitor K of the inverter module 5, which is arranged furthest from the phase connection 3, is directly connected to the conductive connection 4 and to the compensation unit 10. For this purpose, the topology extends an inverter in the star point. A two-level inverter (fig. 7) may be used, or any other inverter with at least one common central intermediate circuit, i.e. for example a two-level inverter, a three-level NPC inverter (fig. 8), a three-level NPP inverter, a nested cell NPP inverter or a floating capacitor inverter may be considered. The intermediate circuit of the cascade H-bridge is connected via the transmission unit 8 via the compensation unit 10 to the intermediate circuit of the inverter in the star point.
The inverter shown in fig. 9 corresponds substantially to the inverter shown in fig. 7, however without the transmission unit 8 and without the transmission control system 9.
Fig. 10 shows a power grid 20, an inverter unit 21 and a three-phase motor 22. The inverter unit 21 basically includes a motor current inverter 23, an intermediate circuit 24 and a power inverter 25. Alternatively, a transformer 26 may be provided between the inverter unit 21 and the grid. The inverter unit 21 and/or the three-phase motor 22 may use the inverter of the present invention.
In the case of a mains supply, the inverter unit 21 and optionally the transformer 26 form a means for supplying the mains 20. In this case, the three-phase motor 22 operates as a generator for generating electricity.
It can also be provided that the current from the power grid 20 is supplied via the inverter unit 21 to the three-phase motor 20 designed as an electric motor.
Claims (15)
1. Inverter for an alternating current system, in particular a three-phase system, comprising two or more phases (U, V, W), wherein for each phase (U, V, W) one arm (13) or two arms (1, 2) are provided, said arms having respective inverter modules (5) connected in series and having phase connections (3), and each arm (1, 2, 13) of one phase (U, V, W) is connected to a respective arm (1, 2, 13) of each other phase (U, V, W) by means of an electrically conductive connection (4) having a uniform potential, characterized in that: for each arm (1, 2, 13) of one phase (U, V, W), the inverter module (5) connected to the conductive connection (4) is connected to a compensation unit (10) which allows energy transfer between said arm (1, 2, 13) of said one phase (U, V, W) and the arms (1, 2, 13) of the other phase (U, V, W).
2. The inverter according to claim 1, wherein: for each arm (1, 2, 13) of one phase (U, V, W), the inverter module (5) arranged furthest from the phase connection (3) is connected to a compensation unit (10).
3. The inverter according to claim 1 or 2, characterized in that: the inverter modules (5) are each connected in series and at least one transmission unit (8) is provided in at least one arm (1, 2, 13), preferably in all arms (1, 2, 13), which allows for load-current-independent energy transfer between one inverter module (5) of the arms (1, 2, 13) and at least one other inverter module (5) of the same arm (1, 2, 13), and in particular a transmission control system (9) is provided which controls the energy transfer independently of the load current.
4. An inverter according to claim 3, characterized in that: in at least one arm (1, 2, 13), preferably in all arms (1, 2, 13), the transmission units (8) are arranged in series.
5. The inverter according to claim 4, wherein: the inverter modules (5) in at least one arm (1, 2, 13), preferably in all arms (1, 2, 13), are each connected to a transmission unit (8).
6. The inverter according to any one of claims 3 to 5, characterized in that: the transmission unit (8) is designed as a voltage transformer.
7. The inverter according to any one of claims 3 to 6, characterized in that: the transmission control system (9) controls the additional energy transfer as a function of the switching state and the load state of the connected inverter module (5).
8. The inverter according to any one of claims 1 to 7, characterized in that: for each phase (U, V, W) an arm (13) is provided and the conductive connection (4) is a star junction.
9. The inverter of claim 8, wherein: the compensation unit (10) is a star junction with an inverter, in particular an inverter with at least one central intermediate circuit.
10. The inverter according to any one of claims 1 to 7, characterized in that: for each phase (U, V, W) there is one negative pole arm (2) and one positive pole arm (1), and the conductive connection (4) between the positive pole arms (1) of the phases (U, V, W) is a common positive pole joint, in particular a positive pole busbar, and the conductive connection (4) between the negative pole arms (2) of the phases (U, V, W) is a common negative pole joint, in particular a negative pole busbar.
11. The inverter according to any one of claims 1 to 10, characterized in that: the compensation unit (10) is a parallel circuit between the respective inverter modules (5) of the two phases (U, V, W), in particular a parallel circuit of intermediate circuit capacitors (K) of the inverter modules (5) of the two phases (U, V, W).
12. The inverter according to any one of claims 1 to 11, characterized in that: for each arm (1, 2, 13) of one phase (U, V, W), the capacitor (K) of the inverter module (5) arranged furthest from the phase connection (3) is directly connected to the conductive connection (4) and to a compensation unit (10) which allows energy transfer between the arm (1, 2, 13) of said one phase (U, V, W) and the arm (1, 2, 13) of the other phase (U, V, W).
13. Method for operating an inverter for an alternating current system, in particular a three-phase system, comprising two or more phases (U, V, W), wherein for each phase (U, V, W) one arm (13) or two arms (1, 2) are provided, which arms have inverter modules (5) connected in series and have phase connections (3), and each arm (1, 2, 13) of one phase (U, V, W) is connected to a respective arm (1, 2, 13) of each other phase (U, V, W) by means of an electrically conductive connection (4) having a uniform potential, characterized in that: on one arm (1, 2, 13) of at least one phase (U, V, W), an inverter module (5) connected to the conductive connection (4) transfers energy to one arm (1, 2, 13) of the other phase (U, V, W) via a compensation unit (10).
14. The method according to claim 13, wherein: on one arm (1, 2, 13) of at least one phase (U, V, W), the capacitor (K) of the inverter module (5) arranged furthest from the phase connection (3) is directly connected to the electrically conductive connection (4) and to the compensation unit (10), and energy is transferred via the compensation unit (10) to one arm (1, 2, 13) of the other phase (U, V, W).
15. Three-phase motor, in particular motor or mains supply, with at least one inverter, characterized in that: at least one inverter is designed according to any one of claims 1 to 12.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA51120/2020A AT524595A1 (en) | 2020-12-21 | 2020-12-21 | Inverters for AC systems |
| ATA51120/2020 | 2020-12-21 | ||
| PCT/EP2021/087032 WO2022136394A1 (en) | 2020-12-21 | 2021-12-21 | Converter for alternating current systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116746048A true CN116746048A (en) | 2023-09-12 |
Family
ID=79686981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180091827.6A Pending CN116746048A (en) | 2020-12-21 | 2021-12-21 | Inverter for an alternating current system |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4264815A1 (en) |
| CN (1) | CN116746048A (en) |
| AT (1) | AT524595A1 (en) |
| WO (1) | WO2022136394A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6014323A (en) | 1997-08-08 | 2000-01-11 | Robicon Corporation | Multiphase power converter |
| CN110649833A (en) * | 2019-09-03 | 2020-01-03 | 昆明理工大学 | MMC topological structure with interphase bidirectional self-voltage-sharing capability |
-
2020
- 2020-12-21 AT ATA51120/2020A patent/AT524595A1/en unknown
-
2021
- 2021-12-21 CN CN202180091827.6A patent/CN116746048A/en active Pending
- 2021-12-21 EP EP21844254.9A patent/EP4264815A1/en active Pending
- 2021-12-21 WO PCT/EP2021/087032 patent/WO2022136394A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| EP4264815A1 (en) | 2023-10-25 |
| WO2022136394A1 (en) | 2022-06-30 |
| AT524595A1 (en) | 2022-07-15 |
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