CN202121518U - Flying capacitor type five-level photovoltaic inverter - Google Patents
Flying capacitor type five-level photovoltaic inverter Download PDFInfo
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- CN202121518U CN202121518U CN201120262122XU CN201120262122U CN202121518U CN 202121518 U CN202121518 U CN 202121518U CN 201120262122X U CN201120262122X U CN 201120262122XU CN 201120262122 U CN201120262122 U CN 201120262122U CN 202121518 U CN202121518 U CN 202121518U
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- Prior art keywords
- power switch
- switch pipe
- power
- emitter
- collector electrode
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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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4837—Flying capacitor converters
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The utility model discloses a flying capacitor type five-level photovoltaic inverter, comprising a plurality of DC boost main circuits. Each DC boost main circuit possesses a DC input end and a DC output end, a flying capacitor type five-level inverter main circuit comprises an AC output end and is connected with the DC output ends of the DC boost main circuits to inverse a received DC into an AC and outputs from the AC output ends. The flying capacitor type five-level photovoltaic inverter of the utility model can give full play to the efficiency of a solar cell panel, so that the generating efficiency of a whole solar energy generation system is high, a harmonic wave injected in a power grid is small, and the effects on the electric energy quality of the power grid are reduced. n addition, a switch stress dv / dt born by a switch device is small, the flying capacitor type five-level photovoltaic inverter possesses a switch state redundancy function, enables the control mode to be diverse and agile, can use a two-level modulation mode continuously, and has a relative simple drive mode.
Description
Technical field
The utility model relates to a kind of photovoltaic DC-to-AC converter, is specifically related to a kind of many input photovoltaic DC-to-AC converters.
Background technology
The energy is the material base that human society exists and develops.Energy scarcity, being on the rise of ecological deterioration are the global problems that concerns human survival and development at present.Regenerative resource belongs to the clean energy resource that can be recycled, because its resource is very abundant, and not limited by the region, can utilize on the spot, has huge development potentiality and application prospect, is the hope of future source of energy system.
Solar energy is a kind of regenerative resource of flood tide, and direct solar radiation is very abundant to the energy of the earth, distributes extensively, does not pollute the environment clean.China also has abundant solar energy resources, and present developable solar energy is 21,039 hundred million kilowatts, if photovoltaic is loaded onto in 1% Chinese desert, total capacity will reach 1,300,000,000 kilowatts, surpasses China's installed capacity of all energy generatings at present.
Various countries, the world today particularly developed country attach great importance to photovoltaic power generation technology, and its development and utilization has been experienced decades, become the cutting edge technology in green energy resource field gradually.In the world, photovoltaic generation is still comparative maturity on the scale technically no matter, has got into the commercial operations stage, and has been mainly used in generating electricity by way of merging two or more grid systems of city.China's solar energy power generating is started late; The middle and later periods eighties begins to take shape; Technology is in continuous maturation since the nineties; It is very fast to be that industrialization aspect or application facet all develop, and is applied in the generating of outlying areas without electricity stand alone type at present more, for example in Gansu, ground such as Tibet, Xinjiang have been set up is basic electric power facility with the photovoltaic generation.And generate electricity by way of merging two or more grid systems and urban applications is started late; Along with country to the pay attention to day by day of new forms of energy and the promulgation of a series of preferential policies; China's solar power generation increases rapidly, obtains the use of maximal efficiency in order to make photovoltaic cell, and the photovoltaic inversion system is hoped can Maximum Power Output.
Yet because device can bear the restriction of voltage and current ability, traditional two-level inverter is difficult to directly realize high-powerization; In high-voltage applications, the dv/dt of two-level inverter output voltage is very big, can cause Insulation Problems and serious electromagnetic interference simultaneously.
Summary of the invention
The purpose of the utility model is to provide a kind of striding capacitance formula five level photovoltaic DC-to-AC converters, and it can realize using low withstand voltage device to realize high-power output, should solve the existing high problem of photovoltaic DC-to-AC converter voltage stress in addition.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
A kind of striding capacitance formula five level photovoltaic DC-to-AC converters, it comprises:
A plurality of DC boosting main circuits, each DC boosting main circuit has a direct current electrical input and a DC output end respectively;
One striding capacitance formula, five level inverse conversion main circuits; It has an alternating current output; Said striding capacitance formula five level inverse conversion main circuits are connected with the DC output end of said each DC boosting main circuit, are to export from the alternating current output behind the alternating current with the dc inverter that receives.
In above-mentioned striding capacitance formula five level photovoltaic DC-to-AC converters, said striding capacitance formula five level inverse conversion main circuits comprise: a direct current bus; And three brachium pontis that are connected in parallel with said dc bus, said each brachium pontis has identical circuit structure.
In above-mentioned striding capacitance formula five level photovoltaic DC-to-AC converters, said dc bus comprises four electric capacity that are connected in series.
In above-mentioned striding capacitance formula five level photovoltaic DC-to-AC converters, the circuit structure of said brachium pontis is:
One first power switch pipe is parallelly connected with one first power diode; One second power switch pipe is parallelly connected with one second power diode; One the 3rd power switch pipe is parallelly connected with one the 3rd power diode; One the 4th power switch pipe is parallelly connected with one the 4th power diode, and one the 5th power switch pipe is parallelly connected with one the 5th power diode, and one the 6th power switch pipe is parallelly connected with one the 6th power diode; One the 7th power switch pipe is parallelly connected with one the 7th power diode; One the 8th power switch pipe is parallelly connected with one the 8th power diode, and the collector electrode of above-mentioned each power switch pipe all negative electrode of the corresponding diode that is connected in parallel with it connects, and the emitter of above-mentioned each power switch pipe all anode of the corresponding diode that is connected in parallel with it connects; The collector electrode of said first power switch pipe is connected with the positive pole of dc bus; The emitter of said first power switch pipe is connected with the collector electrode of said second power switch pipe, and the emitter of said second power switch pipe is connected with the collector electrode of said the 3rd power switch pipe, and the emitter of said the 3rd power switch pipe is connected with the collector electrode of said the 4th power switch pipe; The emitter of said the 5th power switch pipe is connected with the collector electrode of said the 6th power switch pipe; The emitter of said the 6th power switch pipe is connected with the collector electrode of said the 7th power switch pipe, and the emitter of said the 7th power switch pipe is connected with the collector electrode of said the 8th power switch pipe, and the emitter of said the 8th power switch pipe is connected with the negative pole of said dc bus;
The series arm that one first electric capacity, one second electric capacity and one the 3rd capacitances in series constitute, the one of which end is connected with the emitter of said first power switch pipe, and its other end is connected with the collector electrode of said the 8th power switch pipe;
The series arm that one the 4th electric capacity and one the 5th capacitances in series constitute, the one of which end is connected with the emitter of said second power switch pipe, and its other end is connected with the collector electrode of said the 7th power switch pipe;
One the 6th electric capacity, the one of which end is connected with the emitter of said the 3rd power switch pipe, and its other end is connected with the collector electrode of said the 6th power switch pipe;
The emitter of the 4th power switch pipe of said each brachium pontis is connected the output of back as the phase in the alternating current of said alternating current output output with the collector electrode of the 5th power switch pipe.
Said striding capacitance formula five level photovoltaic DC-to-AC converters also comprise a MPPT (Maximum Power Point Tracking MPPT maximum power point tracking) controller, and it links to each other with said a plurality of DC boosting main circuits and these a plurality of DC boosting main circuits are carried out independently MPPT maximum power point tracking control.
Said striding capacitance formula five level photovoltaic DC-to-AC converters also comprise an inverter controller, and it is connected with said striding capacitance formula five level inverse conversion main circuits, and is connected with said MPPT controller, to the control of being incorporated into the power networks of said striding capacitance formula five level inverse conversion main circuits.
The described striding capacitance formula five level photovoltaic DC-to-AC converters of the utility model make it have the following advantages owing to adopted technique scheme:
(1) in the described striding capacitance formula five level photovoltaic DC-to-AC converters of the utility model, each power device only bears 1/5 busbar voltage, thereby has realized using low withstand voltage device to realize the purpose of high-power output;
(2) the described striding capacitance formula five level photovoltaic DC-to-AC converters of the utility model pass through to increase level number, thereby have improved output waveform, have reduced the output voltage waveforms distortion, and THD (total harmonic distortion) is reduced greatly;
(3) adopt the described technical scheme of the utility model, can use lower switching frequency obtain with high switching frequency under the identical output voltage waveforms of two level converters, so switching loss is little, the efficient height of system;
(4) therefore the described striding capacitance formula five level photovoltaic DC-to-AC converters of the utility model under identical DC bus-bar voltage condition, are compared with two-level inverter owing to increased level, and the switch stress dv/dt that switching device bore reduces greatly;
(5) the described striding capacitance formula five level photovoltaic DC-to-AC converters of the utility model have the on off state redundancy feature, can use different on off states to realize identical voltage output, so control mode are versatile and flexible;
(6) the described striding capacitance formula five level photovoltaic DC-to-AC converters of the utility model are owing to adopted striding capacitance; Even make many power tubes parameter inconsistent with the nonsynchronous situation of switching transient under; The voltage stress that each power tube bears in stable state and transient process is clamped on the voltage of bus capacitor all the time; Thereby can not produce indivedual power tube overvoltages, and then influence the problem of circuit reliability.
Description of drawings
Fig. 1 is the described striding capacitance formula five level photovoltaic DC-to-AC converters of the utility model topological diagrams in one embodiment.
Fig. 2 is striding capacitance formula five a level inverse conversion main circuits circuit structure diagram in one embodiment in the described striding capacitance formula five level photovoltaic DC-to-AC converters of the utility model.
Embodiment
For the ease of those skilled in the art's understanding, will combine specific embodiment and accompanying drawing thereof that the described striding capacitance formula five level photovoltaic DC-to-AC converters of the utility model are described in detail further below.
As shown in Figure 1; Striding capacitance formula five level photovoltaic DC-to-AC converters in the present embodiment comprise: three DC boosting main circuits; It is connected with three output PV1, PV2 and PV3 of solar-energy photo-voltaic cell respectively, exports through DC output end separately after direct current is boosted.MPPT (Maximum Power Point Tracking MPPT maximum power point tracking) controller; It links to each other with three DC boosting main circuits and each DC boosting main circuit is carried out independently MPPT maximum power point tracking control, thereby gives full play to the efficient of solar-energy photo-voltaic cell.Striding capacitance formula five level inverse conversion main circuits, its input is connected with the DC output end of three DC boosting main circuits, and its alternating current output is connected with electrical network, is to export electrical network to behind the alternating current with the dc inverter that receives.Inverter controller, it is connected with striding capacitance formula five level inverse conversion main circuits, and is connected with the MPPT controller, to the control of being incorporated into the power networks of striding capacitance formula five level inverse conversion main circuits.
Fig. 2 has shown the circuit structure diagram of striding capacitance formula five level inverse conversion main circuits in the present embodiment.As shown in Figure 2, dc bus is made up of four electric capacity that are connected in series; Three identical brachium pontis and dc buss of circuit structure are connected in parallel.Wherein the circuit structure of brachium pontis is: first power switch tube S
1With the first power diode D
1Parallel connection, second power switch tube S
2With the second power diode D
2Parallel connection, the 3rd power switch tube S
3With the 3rd power diode D
3Parallel connection, the 4th power switch tube S
4With the 4th power diode D
4Parallel connection, the 5th power switch tube S
4' and the 5th power diode D
4' parallel connection, the 6th power switch tube S
3' and the 6th power diode D
3' parallel connection, the 7th power switch tube S
2' and the 7th power diode D
2' parallel connection, the 8th power switch tube S
1' and the 8th power diode D
1' parallel connection, the collector electrode of above-mentioned each power switch pipe all negative electrode of the corresponding diode that is connected in parallel with it connects, and the emitter of above-mentioned each power switch pipe all anode of the corresponding diode that is connected in parallel with it connects first power switch tube S
1Collector electrode be connected first power switch tube S with the positive pole of dc bus
1The emitter and second power switch tube S
2Collector electrode connect second power switch tube S
2Emitter and the 3rd power switch tube S
3Collector electrode connect the 3rd power switch tube S
3Emitter and the 4th power switch tube S
4Collector electrode connect the 4th power switch tube S
4Emitter and the 5th power switch tube S
4' collector electrode connect A phase in the back output three-phase alternating current (other two brachium pontis export respectively B mutually with C mutually), the 5th power switch tube S
4' emitter and said the 6th power switch tube S
3' collector electrode connect the 6th power switch tube S
3' emitter and said the 7th power switch tube S
2' collector electrode connect the 7th power switch tube S
2' emitter and the 8th power switch tube S
1' collector electrode connect the 8th power switch tube S
1' emitter be connected with the negative pole of dc bus; First capacitor C
11, second capacitor C
12And the 3rd capacitor C
13One end and first power switch tube S of the series arm that series connection constitutes
1Emitter connect the other end and the 8th power switch tube S
1' collector electrode connect; The 4th capacitor C
21With the 5th capacitor C
22One end and second power switch tube S of the series arm that series connection constitutes
2Emitter connect the other end and the 7th power switch tube S
2' collector electrode connect; The 6th capacitor C
31An end and the 3rd power switch tube S
3Emitter connect its other end and the 6th power switch tube S
3' collector electrode connect.
Be noted that the above specific embodiment of enumerating that is merely the utility model, obviously the utility model is not limited to above embodiment, and many similar variations are arranged thereupon.If those skilled in the art from all distortion that the disclosed content of the utility model directly derives or associates, all should belong to the protection range of the utility model.
Claims (7)
1. striding capacitance formula five level photovoltaic DC-to-AC converters is characterized in that, comprising:
A plurality of DC boosting main circuits, each DC boosting main circuit has a direct current electrical input and a DC output end respectively;
One striding capacitance formula, five level inverse conversion main circuits; It has an alternating current output; Said striding capacitance formula five level inverse conversion main circuits are connected with the DC output end of said each DC boosting main circuit, are to export from the alternating current output behind the alternating current with the dc inverter that receives.
2. striding capacitance formula five level photovoltaic DC-to-AC converters as claimed in claim 1 is characterized in that, said striding capacitance formula five level inverse conversion main circuits comprise: a direct current bus; And three brachium pontis that are connected in parallel with said dc bus, said each brachium pontis has identical circuit structure.
3. striding capacitance formula five level photovoltaic DC-to-AC converters as claimed in claim 2 is characterized in that said dc bus comprises four electric capacity that are connected in series.
4. like claim 2 or 3 described striding capacitance formula five level photovoltaic DC-to-AC converters, it is characterized in that the circuit structure of said brachium pontis is:
One first power switch pipe (S
1) and one first power diode (D
1) parallel connection, one second power switch pipe (S
2) and one second power diode (D
2) parallel connection, one the 3rd power switch pipe (S
3) and one the 3rd power diode (D
3) parallel connection, one the 4th power switch pipe (S
4) and one the 4th power diode (D
4) parallel connection, one the 5th power switch pipe (S
4') and one the 5th power diode (D
4') parallel connection, one the 6th power switch pipe (S
3') and one the 6th power diode (D
3') parallel connection, one the 7th power switch pipe (S
2') and one the 7th power diode (D
2') parallel connection, one the 8th power switch pipe (S
1') and one the 8th power diode (D
1') parallel connection, the collector electrode of above-mentioned each power switch pipe all negative electrode of the corresponding diode that is connected in parallel with it connects, and the emitter of above-mentioned each power switch pipe all anode of the corresponding diode that is connected in parallel with it connects the said first power switch pipe (S
1) collector electrode be connected the said first power switch pipe (S with the positive pole of dc bus
1) emitter and the said second power switch pipe (S
2) collector electrode connect the said second power switch pipe (S
2) emitter and said the 3rd power switch pipe (S
3) collector electrode connect said the 3rd power switch pipe (S
3) emitter and said the 4th power switch pipe (S
4) collector electrode connect said the 5th power switch pipe (S
4') emitter and said the 6th power switch pipe (S
3') collector electrode connect said the 6th power switch pipe (S
3') emitter and said the 7th power switch pipe (S
2') collector electrode connect said the 7th power switch pipe (S
2') emitter and said the 8th power switch pipe (S
1') collector electrode connect said the 8th power switch pipe (S
1') emitter be connected with the negative pole of said dc bus;
One first electric capacity (C
11), one second electric capacity (C
12) and one the 3rd electric capacity (C
13) series arm that constitutes of series connection, one of which end and the said first power switch pipe (S
1) emitter connect its other end and said the 8th power switch pipe (S
1') collector electrode connect;
One the 4th electric capacity (C
21) and one the 5th electric capacity (C
22) series arm that constitutes of series connection, one of which end and the said second power switch pipe (S
2) emitter connect its other end and said the 7th power switch pipe (S
2') collector electrode connect;
One the 6th electric capacity (C
31), one of which end and said the 3rd power switch pipe (S
3) emitter connect its other end and said the 6th power switch pipe (S
3') collector electrode connect;
The 4th power switch pipe (S of said each brachium pontis
4) emitter and the 5th power switch pipe (S
4') collector electrode connect the output of back as the phase in the alternating current of said alternating current output output.
5. striding capacitance formula five level photovoltaic DC-to-AC converters as claimed in claim 1; It is characterized in that; Also comprise a MPPT controller, it links to each other with said a plurality of DC boosting main circuits and these a plurality of DC boosting main circuits is carried out independently MPPT maximum power point tracking control.
6. striding capacitance formula five level photovoltaic DC-to-AC converters as claimed in claim 4; It is characterized in that; Also comprise a MPPT controller, it links to each other with said a plurality of DC boosting main circuits and these a plurality of DC boosting main circuits is carried out independently MPPT maximum power point tracking control.
7. like claim 5 or 6 described striding capacitance formula five level photovoltaic DC-to-AC converters; It is characterized in that; Also comprise an inverter controller; It is connected with said striding capacitance formula five level inverse conversion main circuits, and is connected with said MPPT controller, to the control of being incorporated into the power networks of said striding capacitance formula five level inverse conversion main circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120262122XU CN202121518U (en) | 2011-07-22 | 2011-07-22 | Flying capacitor type five-level photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120262122XU CN202121518U (en) | 2011-07-22 | 2011-07-22 | Flying capacitor type five-level photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202121518U true CN202121518U (en) | 2012-01-18 |
Family
ID=45462554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120262122XU Expired - Lifetime CN202121518U (en) | 2011-07-22 | 2011-07-22 | Flying capacitor type five-level photovoltaic inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202121518U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647501A (en) * | 2013-12-09 | 2014-03-19 | 湖南大学 | Photovoltaic power structure and maximum power tracking control method |
| CN103872937A (en) * | 2014-03-31 | 2014-06-18 | 上海交通大学 | Control method of flying capacitive type five-level inverter device |
| US9692321B2 (en) | 2013-12-04 | 2017-06-27 | Sungrow Power Supply Co., Ltd. | Five level inverter |
-
2011
- 2011-07-22 CN CN201120262122XU patent/CN202121518U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9692321B2 (en) | 2013-12-04 | 2017-06-27 | Sungrow Power Supply Co., Ltd. | Five level inverter |
| CN103647501A (en) * | 2013-12-09 | 2014-03-19 | 湖南大学 | Photovoltaic power structure and maximum power tracking control method |
| CN103647501B (en) * | 2013-12-09 | 2016-06-15 | 湖南大学 | A kind of photo-voltaic power supply structure and maximum power tracking and controlling method |
| CN103872937A (en) * | 2014-03-31 | 2014-06-18 | 上海交通大学 | Control method of flying capacitive type five-level inverter device |
| CN103872937B (en) * | 2014-03-31 | 2016-03-02 | 上海交通大学 | A kind of control method of striding capacitance type five level inverter |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20120118 |