CN107221942B - Multiphase energy transfer device and control method thereof - Google Patents
Multiphase energy transfer device and control method thereof Download PDFInfo
- Publication number
- CN107221942B CN107221942B CN201611013390.1A CN201611013390A CN107221942B CN 107221942 B CN107221942 B CN 107221942B CN 201611013390 A CN201611013390 A CN 201611013390A CN 107221942 B CN107221942 B CN 107221942B
- Authority
- CN
- China
- Prior art keywords
- phase
- energy
- output
- detection unit
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a multiphase energy converter, which comprises a rectifier filter connected with a power grid, wherein the rectifier filter is connected to a single-phase DC-AC module through a direct current fuse, the single-phase DC-AC module is connected to the power grid through an active filter, an output voltage detection unit and an output current detection unit, the single-phase DC-AC module is connected with a digital processor, and the digital processor is respectively connected with a communication interface circuit and a synchronous signal processing unit. The invention also discloses a control method of the multiphase energy transfer device. The invention can improve the defects of the prior art, not only can realize energy transfer, but also can adjust the unbalanced condition of the three-phase load.
Description
Technical Field
The invention relates to the technical field of low-voltage power grids, in particular to a multiphase energy converter and a control method thereof.
Background
Most of the existing three-phase load unbalance adjusting devices of the low-voltage power grid realize the three-phase load unbalance adjusting devices by utilizing the principle of reactive compensation of a capacitor, and the adjusting rate is 10%. The existing three-phase load unbalance adjusting device is small in adjusting capacity and low in adjusting precision, line loss of a low-voltage power distribution network is not ideal enough, and the use enthusiasm of a low-voltage power grid three-phase load unbalance adjusting user is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a multiphase energy transfer device and a control method thereof, which can solve the defects of the prior art, not only can realize energy transfer, but also can adjust the unbalanced condition of a three-phase load.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A multiphase energy transfer device comprises a rectifier filter connected with a power grid, wherein the rectifier filter is connected to a single-phase DC-AC module through a direct current fuse, the single-phase DC-AC module is connected to the power grid through an active filter, an output voltage detection unit and an output current detection unit, the single-phase DC-AC module is connected with a digital processor, and the digital processor is respectively connected with a communication interface circuit and a synchronous signal processing unit.
Preferably, the digital processor is a 16-bit DSP or DSC digital processor.
In the control method of the multi-phase energy converter, the rectifier filter converts the distributed alternating current energy into direct current energy, the direct current energy is sent to the single-phase DC-AC module through the direct current fuse, and the single-phase DC-AC module converts the direct current energy into one-phase or two-phase alternating current energy with the same phase as that of the alternating current synchronous signal source; the alternating current energy passes through an active filter to filter harmful higher harmonic current; the output voltage detection unit detects the output voltage waveform and compares the output voltage waveform with the waveform of the synchronous signal processing unit to ensure that the waveform of the output voltage detection unit is the same as the waveform of the synchronous signal processing unit in phase; the output current detection unit detects the output current waveform, controls the current of the output one-phase or two-phase alternating current energy according to the current data instruction of the communication interface circuit, ensures that the current waveform tracking of the output current detection unit is synchronous with the voltage waveform of the output voltage detection unit, and sends a synchronous grid connection signal through the communication interface circuit when meeting the energy transfer grid connection condition, so that the alternating current energy output by the energy transfer device is connected to the grid, and the three-phase unbalanced load condition at the power supply side is adjusted in a way of realizing energy distribution in an energy transfer way;
the digital processor receives a control instruction through the communication interface circuit, obtains the phase of a synchronous signal through the synchronous signal processing unit, and then sends the working state and the operating parameters of the energy transfer device to the outside; the digital processor generates a driving signal required by the one-phase or two-phase single-phase or single-phase DC-AC module according to the control instruction, and converts the direct current energy into alternating current energy; when the low-voltage distribution network fails, the input side power supply and the output side load of the energy transfer device are cut off, and the related protection program is started.
Adopt the beneficial effect that above-mentioned technical scheme brought to lie in: the invention can distribute the energy of one phase or two phases with light load to one phase or two phases with heavy energy, and convert the unbalanced load of users into the balanced load facing the line of the distribution transformer. The multiphase energy transfer device is mainly used for transferring electric energy, adopts a digital processor, tracks the energy distribution state of a power grid in time, and transfers energy to one phase or two phases with large energy consumption in time according to an instruction of an energy distributor. By adopting three rectifier filters connected in parallel, one or two rectifier filters can be switched on according to the instruction of the energy distributor, and the distributed energy is converted into direct current from the form of alternating current. The multi-phase output DC-AC converter is adopted to convert direct current into one-phase or two-phase alternating current with the same phase as an alternating current synchronous signal, so that the energy transfer of electric energy is realized, the unbalanced rate of a three-phase load is adjusted, and the line loss of a low-voltage distribution network is reduced.
Drawings
FIG. 1 is a block diagram of one embodiment of the present invention.
In the figure: 1. a rectifier filter; 2. a direct current fuse; 3. a single-phase DC-AC module; 4. an active filter; 5. an output voltage detection unit; 6. an output current detection unit; 7. a digital processor; 8. a communication interface circuit; 9. a synchronization signal processing unit.
Detailed Description
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description and the description of the attached drawings, and the specific connection mode of each part adopts the conventional means of mature bolts, rivets, welding, sticking and the like in the prior art, and the detailed description is not repeated.
Referring to fig. 1, an embodiment of the present invention includes a rectifier filter 1 connected to a power grid, the rectifier filter 1 is connected to a single-phase DC-AC module 3 through a DC fuse 2, the single-phase DC-AC module 3 is connected to the power grid through an active filter 4, an output voltage detection unit 5, and an output current detection unit 6, the single-phase DC-AC module 3 is connected to a digital processor 7, and the digital processor 7 is connected to a communication interface circuit 8 and a synchronous signal processing unit 9, respectively. The digital processor 7 is a 16 bit DSP or DSC digital processor.
In the control method of the multi-phase energy converter, the rectifier filter 1 converts the distributed alternating current energy into direct current energy, the direct current energy is sent to the single-phase DC-AC module 3 through the direct current fuse 2, and the single-phase DC-AC module 3 converts the direct current energy into one-phase or two-phase alternating current energy with the same phase as that of the alternating current synchronous signal source; the alternating current energy passes through an active filter 4 to filter harmful higher harmonic current; the output voltage detection unit 5 detects the output voltage waveform, compares the output voltage waveform with the waveform of the synchronous signal processing unit 9, and ensures that the waveform of the output voltage detection unit 5 and the waveform of the synchronous signal processing unit 9 have the same phase; the output current detection unit 6 detects the output current waveform, controls the current of the output one-phase or two-phase alternating current energy according to the current data instruction of the communication interface circuit 8, ensures that the current waveform tracking of the output current detection unit is synchronous with the voltage waveform of the output voltage detection unit 5, and sends a synchronous grid connection signal through the communication interface circuit 8 when meeting the energy transfer grid connection condition, so that the alternating current energy output by the energy transfer device is connected to the grid, and the three-phase unbalanced load condition at the power supply side is adjusted in a way of realizing energy distribution in an energy transfer way;
the digital processor 7 receives a control instruction through the communication interface circuit 8, obtains the phase of a synchronous signal through the synchronous signal processing unit 9, and then sends the working state and the operating parameters of the energy transfer device to the outside; the digital processor 7 generates a driving signal required by the one-phase or two-phase single-phase and single-phase DC-AC module 3 according to the control instruction, and converts the direct current energy into alternating current energy; when the low-voltage distribution network fails, the input side power supply and the output side load of the energy transfer device are cut off, and the related protection program is started.
The invention not only can realize energy transfer, but also can adjust the unbalanced condition of the three-phase load and reduce the line loss of the low-voltage distribution network.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A control method of a multiphase energy transfer device comprises a rectifier filter (1) connected with a power grid, wherein the rectifier filter (1) is connected to a single-phase DC-AC module (3) through a direct current fuse (2), the single-phase DC-AC module (3) is connected to the power grid through an active filter (4), an output voltage detection unit (5) and an output current detection unit (6), the single-phase DC-AC module (3) is connected with a digital processor (7), and the digital processor (7) is respectively connected with a communication interface circuit (8) and a synchronous signal processing unit (9);
the digital processor (7) is a 16-bit DSP or DSC digital processor;
the method is characterized in that: the rectifier filter (1) converts the distributed alternating current energy into direct current energy, the direct current energy is sent to the single-phase DC-AC module (3) through the direct current fuse (2), and the single-phase DC-AC module (3) converts the direct current energy into one-phase or two-phase alternating current energy with the same phase as that of the alternating current synchronous signal source; the alternating current energy passes through an active filter (4) to filter harmful higher harmonic current; the output voltage detection unit (5) detects the output voltage waveform, compares the output voltage waveform with the waveform of the synchronous signal processing unit (9), and ensures that the waveform of the output voltage detection unit (5) is the same as the waveform phase of the synchronous signal processing unit (9); the output current detection unit (6) detects the output current waveform, controls the current of the output one-phase or two-phase alternating current energy according to the current data instruction of the communication interface circuit (8), ensures that the current waveform tracking of the output current detection unit is synchronous with the voltage waveform of the output voltage detection unit (5), and sends a synchronous grid connection signal through the communication interface circuit (8) when meeting the energy transfer grid connection condition, the alternating current energy output by the energy transfer device is connected to the grid, and the three-phase unbalanced load condition at the power supply side is adjusted in an energy transfer mode;
the digital processor (7) receives a control instruction through the communication interface circuit (8), obtains the phase of a synchronous signal through the synchronous signal processing unit (9), and then sends the working state and the operating parameters of the energy transfer device to the outside; the digital processor (7) generates a driving signal required by the one-phase or two-phase single-phase DC-AC module (3) according to the control instruction, and converts the direct current energy into alternating current energy; when the low-voltage distribution network fails, the input side power supply and the output side load of the energy transfer device are cut off, and the related protection program is started.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611013390.1A CN107221942B (en) | 2016-11-18 | 2016-11-18 | Multiphase energy transfer device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611013390.1A CN107221942B (en) | 2016-11-18 | 2016-11-18 | Multiphase energy transfer device and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107221942A CN107221942A (en) | 2017-09-29 |
| CN107221942B true CN107221942B (en) | 2020-06-09 |
Family
ID=59927439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611013390.1A Active CN107221942B (en) | 2016-11-18 | 2016-11-18 | Multiphase energy transfer device and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107221942B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5751138A (en) * | 1995-06-22 | 1998-05-12 | University Of Washington | Active power conditioner for reactive and harmonic compensation having PWM and stepped-wave inverters |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101179197A (en) * | 2007-12-03 | 2008-05-14 | 黑龙江中星科技股份有限公司 | Three-phase load automatic equalization device of power distribution network |
| CN101645603A (en) * | 2009-08-31 | 2010-02-10 | 湖南大学 | Negative sequence management method of energy injection type balance electric system |
| CN102832632B (en) * | 2012-09-14 | 2014-10-08 | 重庆大学 | Controllable interphase power transfer method and system |
| CN203086152U (en) * | 2012-12-10 | 2013-07-24 | 北京京泓中电环保科技有限公司 | Three-phase current dynamic balancing device |
| CN105552944B (en) * | 2016-02-26 | 2017-12-01 | 东北大学 | A kind of network system and energy adjustment method comprising energy storage and energy router |
-
2016
- 2016-11-18 CN CN201611013390.1A patent/CN107221942B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5751138A (en) * | 1995-06-22 | 1998-05-12 | University Of Washington | Active power conditioner for reactive and harmonic compensation having PWM and stepped-wave inverters |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107221942A (en) | 2017-09-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103683356B (en) | On-Line UPS topology | |
| EP2896109B1 (en) | Uninterruptible power supply system with fast transfer for undervoltage source line failures | |
| KR102326844B1 (en) | Single-phase cycloconverter with integrated line-cycle energy storage | |
| JP5602021B2 (en) | Power control | |
| EP2807716B1 (en) | Circuit for transferring power between a direct current line and an alternating-current line | |
| WO2015165191A1 (en) | Steady state control method for three-phase double-mode inverter | |
| CN102075097A (en) | Method for controlling n+1 fault redundancy of cascade type converter | |
| CN103915852A (en) | Flexible switching system based on single-phase grid-connected inverter and switching method thereof | |
| CN202721450U (en) | Fully controllable energy feedback device | |
| CN103701309A (en) | Alternating-direct current power supply system for variable frequency equipment and variable frequency air conditioner | |
| CN104375039A (en) | Testing system for isolation type direct-current transformer | |
| JP6276370B2 (en) | Hybrid power supply | |
| CN102624016A (en) | Bidirectional energy flowing flow battery energy storage grid connection device and control method thereof | |
| CN106716775A (en) | Uninterruptible power supply system with precharge converter | |
| CN101521393A (en) | On-line uninterrupted power supply device | |
| CN209823429U (en) | Three-phase unbalance compensation device | |
| CN106300340B (en) | A kind of flexibility multimode switching device and its control method | |
| CN104506069A (en) | Non-isolation type photovoltaic grid-connected inverter | |
| CN202889212U (en) | Single-phase to three-phase power purification device | |
| CN103368249B (en) | The system and method that a kind of uninterrupted power supply is powered | |
| CN107221942B (en) | Multiphase energy transfer device and control method thereof | |
| CN208767793U (en) | A kind of distribution transformer active power balancer based on electronic power convertor | |
| CN102215005A (en) | Inverter | |
| CN204441889U (en) | With the active filter of VSC circuit | |
| Kalyan et al. | Analysis and design of power electronic transformer based power quality improvement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |