CN113572383A - Photovoltaic power generation inversion system and photovoltaic power generation inversion control method - Google Patents
Photovoltaic power generation inversion system and photovoltaic power generation inversion control method Download PDFInfo
- Publication number
- CN113572383A CN113572383A CN202110666319.8A CN202110666319A CN113572383A CN 113572383 A CN113572383 A CN 113572383A CN 202110666319 A CN202110666319 A CN 202110666319A CN 113572383 A CN113572383 A CN 113572383A
- Authority
- CN
- China
- Prior art keywords
- low
- voltage
- power generation
- inversion
- photovoltaic power
- 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.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- 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
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a photovoltaic power generation inversion system and a photovoltaic power generation inversion control method. The photovoltaic power generation inversion system comprises a direct current bus, two low-voltage inversion modules and a three-phase three-winding transformer, wherein the direct current bus consists of a positive half bus and a negative half bus, the input sides of the two low-voltage inversion modules are respectively connected with the positive/negative half bus, the output sides of the two low-voltage inversion modules are respectively connected with two windings on the low-voltage side of the three-phase three-winding transformer, and the high-voltage side of the three-phase three-winding transformer is connected with a power grid. The photovoltaic power generation inversion control method comprises a synchronous work control method and a filtering control method; the synchronous working control method comprises the following steps: controlling the output current of one low-voltage inversion module based on the output current of the other low-voltage inversion module; the filtering control method comprises the following steps: when the harmonic of the output current of one low-voltage inversion module is detected to exceed the standard, the other low-voltage inversion module is controlled to output harmonic with reversed phase and equal amplitude. The invention can reduce the development cost and the control difficulty, realize the induction filtering and improve the grid-connected current quality.
Description
Technical Field
The invention belongs to the technical field of power conversion, and particularly relates to a photovoltaic power generation inversion system and a photovoltaic power generation inversion control method applied by the same.
Background
The maximum voltage of a direct-current system of the photovoltaic grid-connected inverter is determined, and various inverter topologies can be applied. As the dc system voltage rises further, the inversion topology selection may be difficult. Two-level and three-level inversion topology control is simple, technology application is mature, but in order to adapt to high voltage, a plurality of tubes are required to be connected in series for voltage division, and the problems of large number of tubes and uneven voltage exist. The five-level inversion topological structure is complex, the control is difficult, and the application is less at present.
Therefore, for a direct current system with higher voltage, the selection and application of an inverter topology become difficult, the inversion is directly carried out on the higher direct current voltage, and both hardware topology and software control are complex.
Disclosure of Invention
The invention aims to provide a photovoltaic power generation inverter system which can realize the inverter output of a higher-voltage direct current system, reduce the development cost and the control difficulty and improve the quality of grid-connected current.
In order to achieve the purpose, the invention adopts the technical scheme that:
the photovoltaic power generation inversion system comprises a direct-current bus formed by a positive half bus and a negative half bus, and further comprises two low-voltage inversion modules and a three-phase three-winding transformer which work synchronously, wherein the input sides of the two low-voltage inversion modules are respectively connected with the positive half bus and the negative half bus, the output sides of the two low-voltage inversion modules are respectively directly connected with two windings on the low-voltage side of the three-phase three-winding transformer, and the high-voltage side of the three-phase three-winding transformer is connected with a power grid.
The three-phase three-winding transformer is a Y/D/D transformer or a Y/Y/D transformer.
The low-voltage inversion module is a three-phase low-voltage inversion module.
The highest voltage of the positive half bus and the highest voltage of the negative half bus are equal.
The invention also provides a photovoltaic power generation inversion control method applicable to the photovoltaic power generation inversion system, which has the scheme that:
a photovoltaic power generation inversion control method is applied to the photovoltaic power generation inversion system and comprises a synchronous work control method for controlling two low-voltage inversion modules to work synchronously and a filtering control method for realizing inductive filtering;
the synchronous working control method comprises the following steps: the output current of one low-voltage inversion module is used as a target, the output current of the other low-voltage inversion module is used as a controlled object, and therefore the controlled object is controlled based on the target, the output currents and the phases of the two low-voltage inversion modules are kept consistent, and synchronous work of the two low-voltage inversion modules is achieved;
the filtering control method comprises the following steps: when the harmonic waves of the output current of one low-voltage inversion module are detected to exceed the standard, the other low-voltage inversion module is controlled to output harmonic waves with opposite phases and equal amplitudes with the harmonic waves exceeding the standard, and the harmonic waves output by the two low-voltage inversion modules are mutually offset in the magnetic core of the three-phase three-winding transformer.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention realizes the inversion output of a better voltage direct current system by using the low-voltage inversion module, does not need to develop the high-voltage inversion module, can reduce the development cost and the control difficulty, can realize the induction filtering and improves the grid-connected current quality.
Drawings
Fig. 1 is a circuit diagram of a photovoltaic power generation inverter system of the present invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
The first embodiment is as follows: as shown in fig. 1, a photovoltaic power generation inverter system includes a dc bus, two low-voltage inverter modules, and a three-phase three-winding transformer.
The direct current bus comprises a positive half bus and a negative half bus, and the highest voltage of the positive half bus is equal to that of the negative half bus. The low-voltage inversion module is a three-phase low-voltage inversion module of a low-voltage direct current system. The two low-voltage inversion modules are respectively a low-voltage inversion module 1 and a low-voltage inversion module 2. The input sides of the two low-voltage inversion modules are respectively connected with the positive half bus and the negative half bus, namely the input side of the low-voltage inversion module 1 is connected with the positive half bus, and the input side of the low-voltage inversion module 2 is connected with the negative half bus. The output sides of the two low-voltage inversion modules are respectively and directly connected with two windings on the low-voltage side of the three-phase three-winding transformer, namely the output side of the low-voltage inversion module 1 is connected to an S-side winding of the three-phase three-winding transformer, and the output side of the low-voltage inversion module 2 is connected to a T-side winding of the three-phase three-winding transformer. The high-voltage side of the three-phase three-winding transformer, i.e. its P-side winding, is connected to the grid. The three-phase three-winding transformer is a Y/D/D transformer or a Y/Y/D transformer or other three-phase three-winding transformers.
In order to ensure the balance of the positive half bus voltage and the negative half bus voltage and the normal operation of the three-phase three-winding transformer, the two low-voltage inverter modules need to keep synchronous operation, namely, the input voltage and the current keep basically consistent (the difference value is within a set range), and the output current and the phase keep basically consistent (the difference value is within the set range). Therefore, for the control of the photovoltaic power generation inverter system, the following synchronous working control method is adopted to control the two low-voltage inverter modules to work synchronously: the output current of one low-voltage inverter module is taken as a target, the output current of the other low-voltage inverter module is taken as a controlled object, for example, the output current of the low-voltage inverter module 1 is taken as a target, and the output current of the low-voltage inverter module 2 is taken as a controlled object, or vice versa. And controlling the controlled object based on the target, so that the output currents and the phases of the two low-voltage inversion modules are kept consistent (the difference value is within a set allowable range), and the synchronous work of the two low-voltage inversion modules is realized.
The photovoltaic power generation inverter system not only utilizes the low-voltage inverter module to realize the inverter output of higher direct current system voltage, but also can utilize two secondary windings of the three-phase three-winding transformer to realize induction filtering. The filtering control method for realizing the inductive filtering comprises the following steps: when the harmonic waves of the output current of one low-voltage inversion module are detected to exceed the standard, the other low-voltage inversion module is controlled to output harmonic waves with opposite phases and equal amplitudes with the harmonic waves exceeding the standard, and the harmonic waves output by the two low-voltage inversion modules are mutually offset in the magnetic core of the three-phase three-winding transformer. For example, when the harmonic output by the low-voltage inverter module 1 exceeds the standard, the low-voltage inverter module 2 can be controlled to output an anti-phase harmonic with the same amplitude, the two harmonics are mutually offset in the magnetic fields of the three-phase three-winding transformer magnetic cores, the subharmonic can be eliminated for the current waveform output by the primary side of the three-phase three-winding transformer, and the electric energy quality of grid-connected current is improved. If the carrier phases modulated by the two low-voltage inversion modules have wrong phases, the ripple of the primary side grid-connected current of the three-phase three-winding transformer can be reduced by utilizing the characteristic, so that the capacity of the transformer is reduced.
The photovoltaic power generation inversion system utilizes the existing low-voltage inversion module to realize inversion output of higher direct current system voltage by means of the three-phase three-winding transformer, and utilizes the characteristics of the three-phase three-winding transformer that the common magnetic core and the inversion output are controllable to realize induction filtering, eliminate redundant higher harmonics and reduce grid-connected current ripples. Therefore, the beneficial effects are as follows: the high-voltage inverter module is not required to be developed, development cost and control difficulty are reduced, induction filtering is realized without additionally adding a hardware circuit by means of the three-phase three-winding transformer, and grid-connected current quality is improved.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. The utility model provides a photovoltaic power generation inverter system, includes the direct current bus that constitutes by positive half generating line and negative half generating line, its characterized in that: the photovoltaic power generation system further comprises two low-voltage inversion modules and a three-phase three-winding transformer, wherein the two low-voltage inversion modules work synchronously, the input sides of the two low-voltage inversion modules are respectively connected with the positive half bus and the negative half bus, the output sides of the two low-voltage inversion modules are respectively directly connected with two windings on the low-voltage side of the three-phase three-winding transformer, and the high-voltage side of the three-phase three-winding transformer is connected with a power grid.
2. The photovoltaic power generation inversion system according to claim 1, wherein: the three-phase three-winding transformer is a Y/D/D transformer or a Y/Y/D transformer.
3. The photovoltaic power generation inversion system according to claim 1, wherein: the low-voltage inversion module is a three-phase low-voltage inversion module.
4. The photovoltaic power generation inversion system according to claim 1, wherein: the highest voltage of the positive half bus and the highest voltage of the negative half bus are equal.
5. A photovoltaic power generation inversion control method applied to the photovoltaic power generation inversion system according to any one of claims 1 to 4, characterized in that: the photovoltaic power generation inversion control method comprises a synchronous work control method for controlling two low-voltage inversion modules to work synchronously and a filtering control method for realizing induction filtering;
the synchronous working control method comprises the following steps: the output current of one low-voltage inversion module is used as a target, the output current of the other low-voltage inversion module is used as a controlled object, and therefore the controlled object is controlled based on the target, the output currents and the phases of the two low-voltage inversion modules are kept consistent, and synchronous work of the two low-voltage inversion modules is achieved;
the filtering control method comprises the following steps: when the harmonic waves of the output current of one low-voltage inversion module are detected to exceed the standard, the other low-voltage inversion module is controlled to output harmonic waves with opposite phases and equal amplitudes with the harmonic waves exceeding the standard, and the harmonic waves output by the two low-voltage inversion modules are mutually offset in the magnetic core of the three-phase three-winding transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110666319.8A CN113572383B (en) | 2021-06-16 | 2021-06-16 | Photovoltaic power generation inversion system and photovoltaic power generation inversion control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110666319.8A CN113572383B (en) | 2021-06-16 | 2021-06-16 | Photovoltaic power generation inversion system and photovoltaic power generation inversion control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113572383A true CN113572383A (en) | 2021-10-29 |
| CN113572383B CN113572383B (en) | 2023-03-03 |
Family
ID=78162084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110666319.8A Active CN113572383B (en) | 2021-06-16 | 2021-06-16 | Photovoltaic power generation inversion system and photovoltaic power generation inversion control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113572383B (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101378243A (en) * | 2008-09-28 | 2009-03-04 | 江苏方程电力科技有限公司 | Dual inverter for side control of high-voltage motor speed-governing rotor |
| CN103597695A (en) * | 2011-03-16 | 2014-02-19 | Sma太阳能技术股份公司 | Mains-coupled inverter, inverter arrangement and method for operating an inverter arrangement |
| CN104079184A (en) * | 2014-06-23 | 2014-10-01 | 周细文 | Wind power converter based on bipolar direct-current structure |
| CN104218609A (en) * | 2014-09-22 | 2014-12-17 | 周细文 | Topological structure of photovoltaic power station system based on bipolar direct-current transmission |
| CN104242706A (en) * | 2014-08-27 | 2014-12-24 | 江苏永来福实业有限公司 | MW-level photovoltaic inverter system topological structure |
| CN104467653A (en) * | 2014-08-27 | 2015-03-25 | 江苏永来福实业有限公司 | Bipolar photovoltaic system topology structure and application thereof |
| CN104578873A (en) * | 2013-10-15 | 2015-04-29 | 高毅夫 | Control method for high-quality DC (direct current)/AC (alternating current) converter of grid-connected photovoltaic power system |
| JP3208369U (en) * | 2016-10-27 | 2017-01-05 | 株式会社トーメック | Delta-less harmonic cancellation device |
| CN106374830A (en) * | 2016-09-13 | 2017-02-01 | 合肥工业大学 | High-power and high-step-up ratio photovoltaic DC converter device and control method |
| CN106786770A (en) * | 2017-01-19 | 2017-05-31 | 株洲中车时代电气股份有限公司 | A kind of photovoltaic inversion unit and three-phase photovoltaic grid-connected TRT |
| CN108767861A (en) * | 2018-04-03 | 2018-11-06 | 湖南大学 | Dispersion and concentration applied to photovoltaic plant mutually coordinates two stage filter implementation method |
| CN109617425A (en) * | 2018-12-06 | 2019-04-12 | 中铁电气化局集团有限公司 | A kind of full-control type cophase supply system |
| CN112398175A (en) * | 2020-12-07 | 2021-02-23 | 阳光电源股份有限公司 | Medium-voltage photovoltaic grid-connected inverter system and photovoltaic power generation system |
| CN112865575A (en) * | 2021-04-13 | 2021-05-28 | 阳光电源股份有限公司 | Inversion control method and application device thereof |
-
2021
- 2021-06-16 CN CN202110666319.8A patent/CN113572383B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101378243A (en) * | 2008-09-28 | 2009-03-04 | 江苏方程电力科技有限公司 | Dual inverter for side control of high-voltage motor speed-governing rotor |
| CN103597695A (en) * | 2011-03-16 | 2014-02-19 | Sma太阳能技术股份公司 | Mains-coupled inverter, inverter arrangement and method for operating an inverter arrangement |
| CN104578873A (en) * | 2013-10-15 | 2015-04-29 | 高毅夫 | Control method for high-quality DC (direct current)/AC (alternating current) converter of grid-connected photovoltaic power system |
| CN104079184A (en) * | 2014-06-23 | 2014-10-01 | 周细文 | Wind power converter based on bipolar direct-current structure |
| CN104242706A (en) * | 2014-08-27 | 2014-12-24 | 江苏永来福实业有限公司 | MW-level photovoltaic inverter system topological structure |
| CN104467653A (en) * | 2014-08-27 | 2015-03-25 | 江苏永来福实业有限公司 | Bipolar photovoltaic system topology structure and application thereof |
| CN104218609A (en) * | 2014-09-22 | 2014-12-17 | 周细文 | Topological structure of photovoltaic power station system based on bipolar direct-current transmission |
| CN106374830A (en) * | 2016-09-13 | 2017-02-01 | 合肥工业大学 | High-power and high-step-up ratio photovoltaic DC converter device and control method |
| JP3208369U (en) * | 2016-10-27 | 2017-01-05 | 株式会社トーメック | Delta-less harmonic cancellation device |
| CN106786770A (en) * | 2017-01-19 | 2017-05-31 | 株洲中车时代电气股份有限公司 | A kind of photovoltaic inversion unit and three-phase photovoltaic grid-connected TRT |
| CN108767861A (en) * | 2018-04-03 | 2018-11-06 | 湖南大学 | Dispersion and concentration applied to photovoltaic plant mutually coordinates two stage filter implementation method |
| CN109617425A (en) * | 2018-12-06 | 2019-04-12 | 中铁电气化局集团有限公司 | A kind of full-control type cophase supply system |
| CN112398175A (en) * | 2020-12-07 | 2021-02-23 | 阳光电源股份有限公司 | Medium-voltage photovoltaic grid-connected inverter system and photovoltaic power generation system |
| CN112865575A (en) * | 2021-04-13 | 2021-05-28 | 阳光电源股份有限公司 | Inversion control method and application device thereof |
Non-Patent Citations (1)
| Title |
|---|
| 梁崇淦: "十二脉波整流变压器集成感应滤波理论与应用研究", 《中国博士学位论文全文数据库》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113572383B (en) | 2023-03-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7046527B2 (en) | Power converter with ripple current cancellation using skewed switching techniques | |
| Li et al. | Variable switching frequency PWM strategy for high-frequency circulating current control in paralleled inverters with coupled inductors | |
| CN113037117B (en) | MMC-SST topology based on four active bridges and control method | |
| Zhao et al. | Analysis and suppression of resonant current envelope ripple of LLC converter in cascaded modular PV solid-state transformer | |
| CN101567567A (en) | Carrier shifting inversion large power photovoltaic grid-connection system and control method thereof | |
| CN212660115U (en) | Rectifying system for grid-connected water electrolysis hydrogen production | |
| CN116260348B (en) | MMC-based high-capacity electrolytic hydrogen production hybrid rectifier and control method | |
| Naik et al. | A new two-phase five-level converter for three-phase isolated grid-tied systems with inherent capacitor balancing and reduced component count | |
| CN105305853A (en) | Multi-pulse wave rectifier using active power factor correction technology and design method thereof | |
| Teng et al. | Common high-frequency bus-based cascaded multilevel solid-state transformer with ripple and unbalance power decoupling channel | |
| Prakash et al. | Power quality improvement in utility interactive based ac–dc converter using harmonic current injection technique | |
| CN106803719B (en) | High-voltage modular multi-level isolation type direct-current transformer without bridge arm reactor | |
| Kumar et al. | An 18-pulse converter and 4-level cascaded inverter based induction motor drive | |
| Ge et al. | Current balancer‐based grid‐connected parallel inverters for high power wind‐power system | |
| CN114977859B (en) | Three-phase N-module cascading type unidirectional energy flow multi-level frequency converter and control method | |
| CN114696630B (en) | Bootstrap-type compensated three-port converter and control method and system thereof | |
| CN113572383B (en) | Photovoltaic power generation inversion system and photovoltaic power generation inversion control method | |
| CN108023496B (en) | Series simultaneous selection switch voltage type single-stage multi-input low-frequency link inverter | |
| de Almeida et al. | A bidirectional single-stage three-phase rectifier with high-frequency isolation and power factor correction | |
| CN203057066U (en) | Feedforward compensation energy-saving control converter | |
| Li et al. | New strategy for eliminating zero-sequence circulating current between parallel operating three-level NPC voltage source inverters | |
| Hasan et al. | A high frequency linked modular cascaded multilevel inverter | |
| de Almeida et al. | Modulation technique for a single-stage three-phase bidirectional AC/DC converter with PFC and high-frequency isolation | |
| Aihsan et al. | Harmonic Analysis of Three-Phase Asymmetrical Multilevel Inverter with Reduced Number of Switches | |
| CN213693509U (en) | Combined three-phase high-voltage inverter |
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 | ||
| CB02 | Change of applicant information |
Address after: 215000 No. 90, Zijin Road, high tech Zone, Suzhou, Jiangsu Applicant after: Goodway Technology Co.,Ltd. Address before: No. 90, Zijin Road, high tech Zone, Suzhou City, Jiangsu Province, 215011 Applicant before: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |