CN202424525U - Frequency converter - Google Patents
Frequency converter Download PDFInfo
- Publication number
- CN202424525U CN202424525U CN201120495749XU CN201120495749U CN202424525U CN 202424525 U CN202424525 U CN 202424525U CN 201120495749X U CN201120495749X U CN 201120495749XU CN 201120495749 U CN201120495749 U CN 201120495749U CN 202424525 U CN202424525 U CN 202424525U
- Authority
- CN
- China
- Prior art keywords
- converter
- afe
- inverter
- circuit
- branch road
- 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.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model relates to a frequency converter which comprises a solar photovoltaic (PV) array, an AFE (Analog Front End) converter, a DC/DC (Direct Current to Direct Current) converter and a DC/AC (Direct Current to Alternating Current) inverter, wherein the output of the solar PV array is connected with the DC/DC converter, and the output of the DC/DC converter is in parallel connection with the DC/AC inverter and the AFE converter. The frequency converter has a plurality of usage modes, and thus the requirements of a plurality of use occasions are met; and the frequency converter has the characteristic of multiple purposes, so that solar photovoltaic electric energy is utilized to the greatest extent.
Description
Technical field
The utility model relates to a kind of frequency converter, and particularly a kind of can photovoltaic/civil power complementation the power supply realized the one drag two function, and the converter plant that can generate electricity by way of merging two or more grid systems.
Background technology
Along with improving constantly of human living standard, demands for energy is increased considerably.Fossil energy is exhausted just day by day as non-renewable energy resources, and the environmental pollution that it causes is serious day by day.Solar photovoltaic powered as the green novel energy source supply power mode, obtained increasing application.Its great advantage is to regenerate, and environment is not polluted.
Use the frequency converter of photovoltaic power supply all to belong to the category of using from net at present, the photovoltaic frequency converter receives inside even from weather such as intensity of illumination, temperature, the situation of electricity shortage possibly occur, can not guarantee the work that frequency converter is continual and steady; , load sufficient when power supply hour only has part photovoltaic electric energy to obtain utilizing, and can produce the situation of the wasting of resources again.
The utility model content
Its purpose of the utility model just is to propose a kind of frequency converter, has multiple use pattern, satisfies multiple use occasion requirement, has the characteristics of a tractor serves several purposes, maximally utilises the photovoltaic electric energy.
The technical scheme that realizes above-mentioned purpose and take; Comprise solar energy photovoltaic array PV, AFE converter, DC/DC converter and DC/AC inverter; Said solar energy photovoltaic array PV output connects DC/DC converter, DC/DC converter output-parallel DC/AC inverter and AFE converter.
Compared with prior art the utlity model has following advantage.
Realized the multiple mode of operation of photovoltaic frequency converter; Widened photovoltaic Inverter Application field, guaranteed that frequency converter can continue the operation of reliable and stable ground, and can be with unnecessary energy feedback grid; Have the advantage of utilizing solar energy to greatest extent, help environmental protection.Under special circumstances, all right motor load of extra interpolation of the utility model perhaps converts photovoltaic combining inverter to, has the characteristics of a tractor serves several purposes.
Description of drawings
Below in conjunction with accompanying drawing the utility model is done further to detail.
Fig. 1 is this apparatus structure theory diagram.
Fig. 2 is this device circuit schematic diagram.
Fig. 3 is the structured flowchart of complementary powering mode in this device.
Energy flow graph when Fig. 4 equates with motor load power for photovoltaic array input power under the complementary powering mode in this device.
Fig. 5 is the energy flow graph during greater than motor load power for photovoltaic array input power under the complementary powering mode in this device.
Fig. 6 is the energy flow graph during less than motor load power for photovoltaic array input power under the complementary powering mode in this device.
Fig. 7 is the structured flowchart of one drag two pattern in this device.
Fig. 8 is the structured flowchart of the pattern that is incorporated into the power networks in this device.
Embodiment
Embodiment, as shown in Figure 1, comprise solar energy photovoltaic array PV, AFE converter, DC/DC converter and DC/AC inverter, said solar energy photovoltaic array PV output connects DC/DC converter, DC/DC converter output-parallel DC/AC inverter and AFE converter.
Said DC/AC inverter output connects alternating current machine, and said AFE converter output connects mains supply, and is as shown in Figure 3.
Said DC/AC inverter output connects alternating current machine M1, and said AFE converter output connects alternating current machine M2, and is as shown in Figure 7.
Said AFE converter output connects mains supply, and is as shown in Figure 8.
Said DC/DC converter comprises input filter capacitor (1), Boost booster circuit (2); Single-phase full bridge inverter circuit (3), high frequency transformer (4), single-phase full bridge rectification circuit (5) and current-limiting circuit (6); Said input filter capacitor (1) connects photovoltaic array PV, and said current-limiting circuit inserts dc bus.
Said AFE converter comprises filter circuit (9), three phase full bridge circuit (8) and current-limiting circuit (7), and said current-limiting circuit (7) inserts dc bus.
Said filter circuit (9) comprises two branch road parallel connections, and a branch road (10) is by a switch series connection Three-phase electric-wave filter, and another branch road (11) comprises a switch, and the switch of said branch road (10) and branch road (11) is interlocking.
This device comprises solar energy photovoltaic array PV, AFE converter, DC/DC converter, DC/AC inverter.This device can have three kinds of mode of operations: complementary powering mode, one drag two pattern and the pattern of generating electricity by way of merging two or more grid systems.Complementary powering mode is, the solar energy photovoltaic array is through the DC/DC converter, and mains supply is through the AFE converter, and the two is parallel on the dc bus, then through the DC/AC inverter produce can frequency conversion AC energy driving alternating current machine.The photovoltaic electric energy is as main power supply, and when photovoltaic power supply was not enough, civil power was as accessory power supply; When photovoltaic power supply was excessive, the AFE converter was fed back to electrical network with excess energy, had guaranteed to load under the various situation and can stably work, and realized the maximization that solar energy utilizes.The one drag two pattern is; The solar energy photovoltaic array is connected on the dc bus through the DC/DC converter; AFE converter and DC/AC inverter produce respectively can frequency conversion AC energy drive two alternating current machines; Compare other frequency converters, can extraly add a motor load, be equivalent to save a frequency converter.The pattern of generating electricity by way of merging two or more grid systems is, the solar energy photovoltaic array is connected on the dc bus through the DC/DC converter, through the AFE converter electric energy all is transported in the utility grid then, and at this moment the photovoltaic inverter converts becomes photovoltaic combining inverter.Mode of operation can be decided according to the photo-voltaic power supply situation, and is as shown in table 1.
Table 1
Annotate: √: recommended work pattern; *: alternative mode not; Zero: alternative mode
This apparatus structure is as shown in Figure 1; Comprise solar energy photovoltaic array PV, AFE converter, DC/DC converter, DC/AC inverter; Wherein solar-energy photo-voltaic cell is connected on the dc bus through the DC/DC converter; The dc terminal of DC/AC inverter connects on the dc bus, and the dc terminal of AFE converter connects on the dc bus.
The physical circuit of this device is as shown in Figure 2; The DC/DC converter is by input filter capacitor (1), Boost booster circuit (2); Single-phase full bridge inverter circuit (3), high frequency transformer (4), single-phase full bridge rectification circuit (5) and current-limiting circuit (6) are composed in series successively; Input filter capacitor (1) connects photovoltaic array, and current-limiting circuit inserts dc bus, and the DC/DC converter has the MPPT function.The AFE converter is to be composed in series successively by current-limiting circuit (7), three phase full bridge circuit (8) and filter circuit (9).Wherein filter circuit (9) is composed in parallel by two branch roads, and a branch road (10) is made up of a switch series connection Three-phase electric-wave filter, and another branch road (11) comprises a switch, and the state of the switch of branch road (10) and branch road (11) is an interlocked relationship.The DC/AC inverter comprises a three phase full bridge circuit.Filter capacitor of dc bus parallel connection.
The utlity model has three kinds of mode of operations: complementary powering mode, one drag two pattern and the pattern that is incorporated into the power networks.
The structured flowchart of complementary powering mode is as shown in Figure 3, and the interchange termination of DC/AC inverter is gone into alternating current machine, on the interchange termination civil power 380V/50Hz of AFE converter, and branch road (10) switch closure of filter circuit (9), branch road (11) switch breaks off.The operation principle of complementary powering mode is; MPPT control through the DC/DC converter; Keep photovoltaic array to be operated on the maximum power point, photovoltaic array continues maximum power is input to dc bus like this, and the DC/AC inverter adopts the SVPWM modulation; All the time the form with constant pressure source drives alternating current machine; The flow direction of these energy such as Fig. 4, Fig. 5 and shown in Figure 6 have three kinds maybe, be respectively (1) when the photovoltaic array input power equates with motor load power, whole energy all pass through dc bus from photovoltaic array and flow to alternating current machine; (2) when photovoltaic array input power during greater than motor load power, part energy flows to alternating current machine from photovoltaic array through dc bus, and another part energy flows to utility grid from photovoltaic array through dc bus; (3) when photovoltaic array input power during less than motor load power, part energy flows to alternating current machine from photovoltaic array through dc bus, and another part energy flows to alternating current machine from utility grid through dc bus.These three kinds of situation have all guaranteed to utilize the maximization of photovoltaic electric energy.
Under complementary powering mode, when the photovoltaic array input power equated with motor load power, the AFE converter was not worked; When photovoltaic array input power during greater than motor load power, AFE is in inverter mode, and when photovoltaic array input power during less than motor load power, AFE is in rectification state.The AFE converter carries out the SVPWM modulation system, adopts the two closed loops of current-voltage, and wherein electric current is interior ring, and outer voltage, the purpose that adopts the two closed loops of current-voltage are to guarantee input power and bearing power output coupling, guarantee that simultaneously DC bus-bar voltage is stable.
The structured flowchart of one drag two pattern is as shown in Figure 7; The interchange termination of DC/AC inverter is gone into alternating current machine; The interchange termination of AFE converter is gone into another alternating current machine; Wherein the power of these two motors with can not be greater than the power output of solar energy photovoltaic array, branch road (10) switch of filter circuit (9) breaks off, branch road (11) switch breaks off.The operation principle of one drag two pattern is, the two closed loops of DC/DC converter using current-voltage, and wherein electric current is interior ring, outer voltage, the purpose that adopts the two closed loops of current-voltage are proof load power output requirements, guarantee that simultaneously DC bus-bar voltage is stable; The AFE converter is operated in inverter mode, adopts the SVPWM modulation system, with the form driving alternating current machine of constant pressure source; The DC/AC inverter adopts the SVPWM modulation system, with the form driving alternating current machine of constant pressure source.
The structured flowchart of the pattern that is incorporated into the power networks is as shown in Figure 8, and the interchange end of DC/AC inverter is unsettled, on the interchange termination civil power 380V/50Hz of AFE converter, and branch road (10) switch closure of filter circuit (9), branch road (11) switch breaks off.The operation principle of the pattern that is incorporated into the power networks is; MPPT control through the DC/DC converter keeps photovoltaic array to be operated on the maximum power point, and photovoltaic array continues maximum power is input to dc bus like this; The AFE converter is operated in inverter mode, exports electric energy with the form of constant-current source to electrical network.The AFE converter carries out the SVPWM modulation system, adopts the two closed loops of current-voltage, and wherein electric current is interior ring, and outer voltage, the purpose that adopts the two closed loops of current-voltage are to guarantee input power and power output coupling, guarantee that simultaneously DC bus-bar voltage is stable.
Claims (7)
1. frequency converter; It is characterized in that; Comprise solar energy photovoltaic array PV, AFE converter, DC/DC converter and DC/AC inverter, said solar energy photovoltaic array PV output connects DC/DC converter, DC/DC converter output-parallel DC/AC inverter and AFE converter.
2. a kind of frequency converter according to claim 1 is characterized in that, said DC/AC inverter output connects alternating current machine, and said AFE converter output connects mains supply.
3. a kind of frequency converter according to claim 1 is characterized in that, said DC/AC inverter output connects alternating current machine M1, and said AFE converter output connects alternating current machine M2.
4. a kind of frequency converter according to claim 1 is characterized in that, said AFE converter output connects mains supply.
5. a kind of frequency converter according to claim 1; It is characterized in that; Said DC/DC converter comprises input filter capacitor (1), Boost booster circuit (2); Single-phase full bridge inverter circuit (3), high frequency transformer (4), single-phase full bridge rectification circuit (5) and current-limiting circuit (6), said input filter capacitor (1) connects photovoltaic array PV, and said current-limiting circuit inserts dc bus.
6. a kind of frequency converter according to claim 1 is characterized in that, said AFE converter comprises filter circuit (9), three phase full bridge circuit (8) and current-limiting circuit (7), and said current-limiting circuit (7) inserts dc bus.
7. according to claim 1 or 6 described a kind of frequency converters; It is characterized in that; Said filter circuit (9) comprises two branch road parallel connections; Article one, branch road (10) is by a switch series connection Three-phase electric-wave filter, and another branch road (11) comprises a switch, and the switch of said branch road (10) and branch road (11) is interlocking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120495749XU CN202424525U (en) | 2011-12-02 | 2011-12-02 | Frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120495749XU CN202424525U (en) | 2011-12-02 | 2011-12-02 | Frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202424525U true CN202424525U (en) | 2012-09-05 |
Family
ID=46749249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120495749XU Expired - Fee Related CN202424525U (en) | 2011-12-02 | 2011-12-02 | Frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202424525U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779952A (en) * | 2014-02-20 | 2014-05-07 | 张立伟 | Solar power supply and power generation integrated variable frequency system |
| CN109787534A (en) * | 2019-02-28 | 2019-05-21 | 北京百度网讯科技有限公司 | A kind of frequency converter and frequency-converting control device powered using high voltage direct current |
-
2011
- 2011-12-02 CN CN201120495749XU patent/CN202424525U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779952A (en) * | 2014-02-20 | 2014-05-07 | 张立伟 | Solar power supply and power generation integrated variable frequency system |
| CN109787534A (en) * | 2019-02-28 | 2019-05-21 | 北京百度网讯科技有限公司 | A kind of frequency converter and frequency-converting control device powered using high voltage direct current |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103545905B (en) | A kind of photovoltaic direct-current micro-grid energy coordination control method | |
| CN102545257B (en) | Solar photovoltaic generating single-phase grid-connected inverter and control method thereof | |
| CN104124748B (en) | Bus station's intelligent power supply power-supply system that a kind of clean energy resource compensates | |
| CN101951011B (en) | Solar photovoltaic and commercial power combined power supply system and control method thereof | |
| CN102780221A (en) | System and method for controlling online type photovoltaic power generation microgrid without storage device | |
| CN102882280A (en) | Capacitor hybrid energy storage based efficient wind-solar-utility power complementary power supply device | |
| CN104113133B (en) | Intelligent photovoltaic off-network inverter system and power consumption control method thereof | |
| CN203377675U (en) | Bus station intelligent power supply system characterized by clean energy compensation | |
| CN102255332A (en) | On-grid inverter | |
| CN104868498A (en) | Topological structure for wind-solar integrated large-power grid-connected converter system | |
| CN103501020A (en) | Hybrid power supply system consisting of mains supply network and photovoltaic assembly and control method thereof | |
| CN107959435A (en) | Power supply flyback cycle changing type single-stage multi input inverter while band energy storage device | |
| CN202168016U (en) | Off-grid wind and solar hybrid power generation system | |
| CN104796029A (en) | Micro inverter applied to photovoltaic solar | |
| CN204089686U (en) | A kind of photovoltaic inversion energy-storage system | |
| CN202424525U (en) | Frequency converter | |
| CN206180663U (en) | Electric vehicle charging station | |
| CN202405798U (en) | Energy storage controller for wind and solar hybrid power generation | |
| CN204334416U (en) | A kind of honourable oily hair long electric installation | |
| CN204240236U (en) | Wind light mutual complementing illuminator | |
| Das et al. | Solar photovoltaic powered sailing boat using buck converter | |
| CN209389764U (en) | A kind of control device of solar photoelectricity complementation | |
| CN204030628U (en) | A kind of solar photovoltaic generation system | |
| CN104467007B (en) | Single-phase cascade multilevel photovoltaic grid-connected inverter control system | |
| CN103401268B (en) | Three-phase current type multi-level converter wind power generation grid-connection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20131202 |