CN104467507A - Module for expanding voltage input range of photovoltaic current transformer and implementation method of module for expanding voltage input range of photovoltaic current transformer - Google Patents
Module for expanding voltage input range of photovoltaic current transformer and implementation method of module for expanding voltage input range of photovoltaic current transformer Download PDFInfo
- Publication number
- CN104467507A CN104467507A CN201310450317.0A CN201310450317A CN104467507A CN 104467507 A CN104467507 A CN 104467507A CN 201310450317 A CN201310450317 A CN 201310450317A CN 104467507 A CN104467507 A CN 104467507A
- Authority
- CN
- China
- Prior art keywords
- circuit
- photovoltaic
- module
- switch pipe
- power switch
- 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.)
- Pending
Links
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
Abstract
The invention relates to the field of grid-connected photovoltaic power generation, and particularly discloses a module for expanding the voltage input range of a photovoltaic current transformer and an implementation method of the module for expanding the voltage input range of the photovoltaic current transformer. The module comprises a through circuit, a voltage boosting-reducing circuit and a control circuit. The through circuit is used for direct connection of input and output. The voltage boosting-reducing circuit is used for boosting or reducing the input voltage to expand the range of the input voltage. The control circuit is used for detecting the photovoltaic voltage in real time and controlling seamless switching between the through circuit and the voltage boosting-reducing circuit. By means of the module and the implementation method, the range of the direct-current input voltage of a grid-connected current transformer is expanded, and the efficiency of a transformer system is guaranteed.
Description
Technical field
The present invention relates to parallel network power generation field, especially relate to module and its implementation of a kind of photovoltaic power generation grid-connecting current transformer and its input voltage range broadening.
Background technology
Parallel network power generation current transformer is one of most important parts in photovoltaic generating system, and its service behaviour is as efficiency, and dc voltage operation scope etc. directly affects photovoltaic power station system benefit.Current high-power photovoltaic synchronization current transformer has a very wide range of applications market, and high-power photovoltaic synchronization current transformer mainly adopts voltage-type three phase full bridge inverter main circuit topology usually, as shown in Figure 1.Concerning grid-connected photovoltaic system, photovoltaic pond plate has its particularity, and with illumination variation, photovoltaic pond plate exports the scope range of the fluctuation of voltage with non-constant width.For voltage-type three-phase full-bridge inverting circuit, after AC voltage is fixing, DC voltage has a minimum, limits DC input voitage scope.Such as, for the grid-connected current transformer of 500kW, AC voltage is generally 270V, and now DC side working range is only 450-820V; For the grid-connected current transformer of 630kW, AC voltage is generally 315V, and now DC side operating voltage range is 500-820V.As can be seen here, adopt the large-sized photovoltaic grid-connected converter of this circuit design to there is intrinsic defect, photovoltaic pond plate can not be made to be fully utilized.
More existing producers have employed two-level main circuit structure, and prime adopts Boost circuit, and rear class adopts voltage-type three-phase full-bridge inverting circuit.Boost circuit also known as the boost converter, or claims step-up converter, and be a kind of switch DC booster circuit, it can be that output voltage is higher than input voltage.But this two-level main circuit topological structure still exists larger defect: on the one hand, adopt two-stage series connection mode current transformer efficiency can reduce, especially in high-power situation; On the other hand, when adopting Boost circuit, in the higher situation of DC input voitage, this circuit can not realize buck functionality, there is no contribution for increase input voltage maximum aspect.
Effective scheme is not also had to solve the problems referred to above at present.
Summary of the invention
Technical problem solved by the invention is a kind of 25kW module of design, and the grid-connected current transformer of supporting applicable 500kW, solves the technical barrier that existing high-power photovoltaic synchronization current transformer input voltage range is little.The module of the present invention's design, on the one hand, when grid-connected current transformer input voltage is lower, realizes boosting by booster circuit in this module; On the other hand, when grid-connected current transformer input voltage is higher, step-down is realized by reduction voltage circuit in this module; And this module has direct mode operation, in high-power situation, be switched to the scheme of the grid-connected main circuit of single-stage, make current transformer efficiency realize maximizing.
In order to solve the problems of the technologies described above, the invention provides a kind of module of broadening photovoltaic converter input voltage range, comprising direct circuit, step-up/step-down circuit and control circuit;
Described direct circuit is used for the direct connection of input and output;
Described step-up/step-down circuit is used for boosting or the step-down of input voltage, the scope of broadening described input voltage;
Described control circuit is used for detecting photovoltaic voltage in real time, and controls the seamless switching of described direct circuit and described step-up/step-down circuit.
Preferably, when described direct circuit connects described input and described output, adopt contactor mode.
Be more preferably, described step-up/step-down circuit is in parallel with described direct circuit, and described step-up/step-down circuit is connected with photovoltaic input with one end of described direct circuit parallel connection, and described step-up/step-down circuit is connected with photovoltaic converter with the other end of described direct circuit parallel connection.
Be more preferably, the power of described step-up/step-down circuit is 5% of the power of supporting grid-connected current transformer.
Be more preferably, the power of described step-up/step-down circuit is 25kW, and the power of supporting described grid-connected current transformer is 500kW.
Be more preferably, described step-up/step-down circuit comprises 4 power switch pipe T1 ~ T4, an inductance and a contactor; Described inductance and described contactor by power switch pipe open or close carry out in parallel.
Be more preferably, described control circuit comprises digital processing unit, power circuit, sample circuit, digital interface and drive circuit, and described digital processing unit is connected with described power circuit, described sample circuit, described digital interface and described drive circuit respectively.
Be more preferably, described module is independent of a kind of equipment, or integrates as the part of current transformer and described current transformer.
A kind of implementation method of module of broadening photovoltaic converter input voltage range;
Described control circuit adopts control algolithm, detects photovoltaic voltage in real time;
When photovoltaic operating voltage is in photovoltaic combining inverter voltage range, when not needing boosting and step-down, contactor closes, and photovoltaic pond plate positive pole is connected with inverter by contactor, and now booster circuit and reduction voltage circuit do not work, and are DC circuit;
When photovoltaic operating voltage is not in photovoltaic combining inverter voltage range, contactor disconnects, and power switch pipe T2, power switch pipe T3 and power switch pipe T4 all disconnect, and carry out switch control rule by power switch pipe T1, thus realize the step-down mode of operation being input to output, be reduction voltage circuit;
When contactor disconnects, power switch pipe T1 continues closed, and power switch pipe T2 and power switch pipe T3 disconnects, and carries out switch control rule by power switch pipe T4, realizes the boost operating mode being input to output, is booster circuit.
Wherein, full name " MPPT maximum power point tracking " (the Maximum Power PointTracking) controller for solar of described MPPT controller is the upgraded product of traditional solar charging/discharging controller.MPPT controller can the generating voltage of detecting real-time solar panels, and follows the trail of ceiling voltage current value (V work), makes system with maximum power output to charge in batteries.Be applied in solar energy photovoltaic system, coordinating the work of solar panel, storage battery, load, is the brain of photovoltaic system.
The present invention compared with prior art, has following beneficial effect:
The present invention is fully in conjunction with the feature of photovoltaic generation, the technical scheme of sampling direct circuit and step-up/step-down circuit parallel connection, can the scope of significantly broadening grid-connected converter DC input voitage, simultaneously under high-power ruuning situation, adopt straight-through mode to ensure that photovoltaic generating system efficiency.And in conjunction with the feature of photovoltaic pond plate, step-up/step-down circuit is only a very little part for rated power, is convenient to modular design, and by the control algolithm of seamless switching, achieve smooth transition.
Accompanying drawing explanation
What Fig. 1 was exemplary show existing high-power photovoltaic synchronization current transformer commonly uses logical circuit;
The enforcement logical topology chart of the module of a kind of broadening photovoltaic converter input voltage range of the present invention that what Fig. 2 was exemplary show;
What Fig. 3 was exemplary shows step-up/step-down circuit topological diagram in the present invention;
What Fig. 4 was exemplary shows control circuit logical topology chart in the present invention;
What Fig. 5 was exemplary shows direct mode operation schematic diagram of the present invention;
What Fig. 6 was exemplary shows boost mode schematic diagram of the present invention;
What Fig. 7 was exemplary shows decompression mode schematic diagram of the present invention.
What Fig. 8 was exemplary shows boost mode duty ratio calculation method schematic diagram of the present invention;
What Fig. 9 was exemplary shows decompression mode duty ratio calculation method schematic diagram of the present invention.
Embodiment
Technical problem solved for a better understanding of the present invention, the technical scheme provided, below in conjunction with drawings and Examples, be further elaborated to the present invention.Specific embodiment described herein only in order to explain enforcement of the present invention, but is not intended to limit the present invention.
In a preferred embodiment, compare with the prior art of Fig. 1, Fig. 2 shows and uses module of the present invention to the improvement of original grid-connected application, and wherein gray shade part is module of the present invention; Described module comprises direct circuit (100), step-up/step-down circuit (200) and control circuit (300);
Described direct circuit (100) is for the direct connection of input and output; Contactor mode is adopted in design;
Described step-up/step-down circuit (200) for the boosting of input voltage or step-down, the scope of broadening described input voltage;
Described direct circuit (100) and step-up/step-down circuit (200) structure are as shown in Figure 3, direct circuit (100) is contactor (K1), and step-up/step-down circuit is made up of 4 power switch pipes (T1 ~ T4) and an inductance (L1);
Described control circuit (300) is made up of digital processing unit (310), power circuit (320), sample circuit (330) and drive circuit (340), for controlling direct circuit (100) and step-up/step-down circuit (200), power circuit (320) is from the plate power taking of photovoltaic pond as shown in Figure 4, exports two-way supply voltage for digital processing and drive circuit; Sample circuit (330) for the treatment of the voltage and current signal of photovoltaic pond plate, for digital processing unit; Digital processing unit (310) is made up of single-chip microcomputer, can realize programming Control; Drive circuit (340) is power amplification function, and by drive circuit (340), digital processing unit (310) can realize controlling power switch pipe (T1 ~ T4) and contactor (K1);
Described control circuit (300) has 3 kinds of mode of operations: direct mode operation, boost mode and decompression mode;
Described direct mode operation (as shown in Figure 5) refers to when digital processing unit (310) detects that photovoltaic pond plate voltage is between (500 ~ 820V), control power switch pipe (T1 ~ T4) to disconnect, the operating mode that contactor (K1) is closed;
Described boost mode (as shown in Figure 6) refers to when digital processing unit (310) detects that photovoltaic pond plate voltage is less than 500V, contactor (K1) disconnects, power switch pipe (T1) constant conduction, power switch pipe (T2) disconnects, power switch pipe (T3) disconnects, and the anti-paralleled diode that power switch pipe (T3) inside carries still works; Power switch pipe (T4) adopts PWM (Pulse Width Modulation) to control, its duty ratio calculation method as shown in Figure 8, wherein output voltage Vout finger print block output voltage, also be grid-connected current transformer input voltage, control method is that PI controls, and does output violent change simultaneously and controls.
In boost mode running, after photovoltaic pond plate voltage is greater than 500V, transfer direct mode operation work to;
Described decompression mode (as shown in Figure 7) refers to when digital processing unit (310) detects that photovoltaic pond plate voltage is greater than 820V, contactor (K1) disconnects, power switch pipe (T3) constant conduction, power switch pipe (T4) disconnects, power switch pipe (T2) disconnects, and the anti-paralleled diode that power switch pipe (T2) inside carries still works; Power switch pipe (T1) adopts PWM (Pulse Width Modulation) to control, its duty ratio calculation method as shown in Figure 9, wherein output voltage Vout finger print block output voltage, also be grid-connected current transformer input voltage, control method is that PI controls, and does output violent change simultaneously and controls.
In boost mode running, after photovoltaic pond plate voltage is lower than 820V, transfer direct mode operation work to;
The present invention is described in detail in preferred embodiment above by concrete; but those skilled in the art should be understood that; the present invention is not limited to the above embodiment; all within general principle of the present invention; any amendment of doing, combination and equivalent replacement etc., be all included within protection scope of the present invention.
Claims (9)
1. a module for broadening photovoltaic converter input voltage range, is characterized in that, comprising: direct circuit, step-up/step-down circuit and control circuit;
Described direct circuit is used for the direct connection of input and output;
Described step-up/step-down circuit is used for boosting or the step-down of input voltage, the scope of broadening described input voltage;
Described control circuit is used for detecting photovoltaic voltage in real time, and controls the seamless switching of described direct circuit and described step-up/step-down circuit.
2. the module of broadening photovoltaic converter input voltage range according to claim 1, is characterized in that, when described direct circuit connects described input and described output, adopts contactor mode.
3. the module of broadening photovoltaic converter input voltage range according to claim 1, it is characterized in that, described step-up/step-down circuit is in parallel with described direct circuit, described step-up/step-down circuit is connected with photovoltaic input with one end of described direct circuit parallel connection, and described step-up/step-down circuit is connected with photovoltaic converter with the other end of described direct circuit parallel connection.
4. the module of broadening photovoltaic converter input voltage range according to claim 1, is characterized in that, the power of described step-up/step-down circuit is 5% of the power of supporting grid-connected current transformer.
5. the module of broadening photovoltaic converter input voltage range according to claim 4, is characterized in that, the power of described step-up/step-down circuit is 25kW.
6. the module of broadening photovoltaic converter input voltage range according to claim 1, is characterized in that, described step-up/step-down circuit comprises 4 power switch pipe T1 ~ T4, an inductance and a contactor; Described inductance and described contactor by power switch pipe open or close carry out in parallel.
7. the module of broadening photovoltaic converter input voltage range according to claim 1, it is characterized in that, described control circuit comprises digital processing unit, power circuit, sample circuit, digital interface and drive circuit, and described digital processing unit is connected with described power circuit, described sample circuit, described digital interface and described drive circuit respectively.
8. the module of broadening photovoltaic converter input voltage range according to claim 1, is characterized in that, described module is independent of a kind of equipment, or integrates as the part of current transformer and described current transformer.
9. an implementation method for the module of broadening photovoltaic converter input voltage range, is characterized in that, control circuit adopts control algolithm, detects photovoltaic voltage in real time;
When photovoltaic operating voltage is in photovoltaic combining inverter voltage range, when not needing boosting and step-down, contactor closes, and photovoltaic pond plate positive pole is connected with inverter by contactor, and now booster circuit and reduction voltage circuit do not work, and are DC circuit;
When photovoltaic operating voltage is not in photovoltaic combining inverter voltage range, contactor disconnects, and power switch pipe T2, power switch pipe T3 and power switch pipe T4 all disconnect, and carry out switch control rule by power switch pipe T1, thus realize the step-down mode of operation being input to output, be reduction voltage circuit;
When contactor disconnects, power switch pipe T1 continues closed, and power switch pipe T2 and power switch pipe T3 disconnects, and carries out switch control rule by power switch pipe T4, realizes the boost operating mode being input to output, is booster circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310450317.0A CN104467507A (en) | 2013-09-25 | 2013-09-25 | Module for expanding voltage input range of photovoltaic current transformer and implementation method of module for expanding voltage input range of photovoltaic current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310450317.0A CN104467507A (en) | 2013-09-25 | 2013-09-25 | Module for expanding voltage input range of photovoltaic current transformer and implementation method of module for expanding voltage input range of photovoltaic current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104467507A true CN104467507A (en) | 2015-03-25 |
Family
ID=52913021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310450317.0A Pending CN104467507A (en) | 2013-09-25 | 2013-09-25 | Module for expanding voltage input range of photovoltaic current transformer and implementation method of module for expanding voltage input range of photovoltaic current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104467507A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964197A (en) * | 2018-08-07 | 2018-12-07 | 深圳宝砾微电子有限公司 | A kind of charging circuit and power supply device |
| CN109088459A (en) * | 2018-09-29 | 2018-12-25 | 出门问问信息科技有限公司 | Charging circuit and charging equipment |
| CN113422388A (en) * | 2021-07-29 | 2021-09-21 | 阳光电源股份有限公司 | Photovoltaic system, direct-current power supply and mode switching method thereof |
| WO2022077973A1 (en) * | 2020-10-15 | 2022-04-21 | 珠海格力电器股份有限公司 | Photovoltaic power supply system and control method therefor, and air conditioning unit |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6166527A (en) * | 2000-03-27 | 2000-12-26 | Linear Technology Corporation | Control circuit and method for maintaining high efficiency in a buck-boost switching regulator |
| US20050093526A1 (en) * | 2003-10-29 | 2005-05-05 | Andrew Notman | Multi-mode switching regulator |
| EP1926199A1 (en) * | 2006-11-21 | 2008-05-28 | Dialog Semiconductor GmbH | Buck converter with inductor pre-energizing |
| CN101212173A (en) * | 2006-12-29 | 2008-07-02 | 智原科技股份有限公司 | Control circuit and method for multi-mode switching boost/down rectifier |
| CN101552554A (en) * | 2009-05-11 | 2009-10-07 | 南京航空航天大学 | Control circuit of cascade type buck-boost converter and control method thereof |
| CN101938136A (en) * | 2009-07-01 | 2011-01-05 | 昆明普罗米能源科技有限公司 | Photovoltaic component DC grid-connection controller |
| CN101944850A (en) * | 2009-07-06 | 2011-01-12 | 立锜科技股份有限公司 | Voltage step-up and down switching power circuit as well as control circuit and method thereof |
| CN102195297A (en) * | 2010-03-18 | 2011-09-21 | Abb研究有限公司 | Non-isolated DC - DC converter for solar power plant |
-
2013
- 2013-09-25 CN CN201310450317.0A patent/CN104467507A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6166527A (en) * | 2000-03-27 | 2000-12-26 | Linear Technology Corporation | Control circuit and method for maintaining high efficiency in a buck-boost switching regulator |
| US20050093526A1 (en) * | 2003-10-29 | 2005-05-05 | Andrew Notman | Multi-mode switching regulator |
| EP1926199A1 (en) * | 2006-11-21 | 2008-05-28 | Dialog Semiconductor GmbH | Buck converter with inductor pre-energizing |
| CN101212173A (en) * | 2006-12-29 | 2008-07-02 | 智原科技股份有限公司 | Control circuit and method for multi-mode switching boost/down rectifier |
| CN101552554A (en) * | 2009-05-11 | 2009-10-07 | 南京航空航天大学 | Control circuit of cascade type buck-boost converter and control method thereof |
| CN101938136A (en) * | 2009-07-01 | 2011-01-05 | 昆明普罗米能源科技有限公司 | Photovoltaic component DC grid-connection controller |
| CN101944850A (en) * | 2009-07-06 | 2011-01-12 | 立锜科技股份有限公司 | Voltage step-up and down switching power circuit as well as control circuit and method thereof |
| CN102195297A (en) * | 2010-03-18 | 2011-09-21 | Abb研究有限公司 | Non-isolated DC - DC converter for solar power plant |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964197A (en) * | 2018-08-07 | 2018-12-07 | 深圳宝砾微电子有限公司 | A kind of charging circuit and power supply device |
| CN108964197B (en) * | 2018-08-07 | 2020-11-17 | 深圳宝砾微电子有限公司 | Charging circuit and power supply device |
| CN109088459A (en) * | 2018-09-29 | 2018-12-25 | 出门问问信息科技有限公司 | Charging circuit and charging equipment |
| WO2022077973A1 (en) * | 2020-10-15 | 2022-04-21 | 珠海格力电器股份有限公司 | Photovoltaic power supply system and control method therefor, and air conditioning unit |
| CN113422388A (en) * | 2021-07-29 | 2021-09-21 | 阳光电源股份有限公司 | Photovoltaic system, direct-current power supply and mode switching method thereof |
| CN113422388B (en) * | 2021-07-29 | 2024-04-12 | 阳光电源股份有限公司 | Photovoltaic system, direct-current power supply and mode switching method of direct-current power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101951011B (en) | Solar photovoltaic and commercial power combined power supply system and control method thereof | |
| CN108988451A (en) | Isolation type bidirectional charger control method and control circuit | |
| CN105471238A (en) | Direct current bus voltage ripple compensating method and photovoltaic inverter | |
| CN204290434U (en) | A kind of digital control electric charger for automobile circuit | |
| CN102856916A (en) | Reactive power control method and circuit of single-phase photovoltaic inverter | |
| CN103887955A (en) | Grid-connected inverter for low-frequency current ripple output restraining of fuel cell and control device | |
| CN102299649B (en) | Supply convertor | |
| CN101958660A (en) | Dual-Sepic buck-boost output parallel combined inverter | |
| CN105553249B (en) | Wide-voltage range low voltage stress current-injecting three-phase power factor correcting circuit | |
| CN106300980A (en) | A kind of Sepic Cuk type Combined vertical current converter of input-series and output-parallel | |
| US20200212825A1 (en) | Control processing method for inverter device having h5 topological structure | |
| CN107809182A (en) | A kind of buck-boost grid-connected inverter | |
| CN104269900A (en) | Main wiring system of electric automobile charging station system | |
| CN105471252A (en) | Harmonic-current injection type three-phase power factor correction circuit with high voltage-reduction transformation ratio | |
| CN112865532A (en) | Control circuit of four-switch buck-boost converter | |
| WO2014079268A1 (en) | Bi-directional storing inverter used in grid connected power system | |
| CN104467507A (en) | Module for expanding voltage input range of photovoltaic current transformer and implementation method of module for expanding voltage input range of photovoltaic current transformer | |
| KR101609245B1 (en) | Apparatus for storing energy | |
| CN106712523A (en) | Boost three-level full-bridge inverter and control method thereof | |
| CN106787900B (en) | Boosting gird-connected inverter and its control method | |
| Chandran et al. | Solar PV based retrofit solution for cell phone towers powered by diesel generators | |
| CN204696953U (en) | A kind of Z-source inverter being applicable to photovoltaic generation | |
| CN203911800U (en) | High-frequency isolated photovoltaic inverter | |
| CN204089592U (en) | A kind of novel wind-solar complementary step-up/step-down dc-dc converter | |
| CN207720041U (en) | From grid-connected city's power production photovoltaic battery integration inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |
|
| RJ01 | Rejection of invention patent application after publication |