CN204144967U - Based on the large-sized photovoltaic grid-connected system of MMC - Google Patents
Based on the large-sized photovoltaic grid-connected system of MMC Download PDFInfo
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- CN204144967U CN204144967U CN201420531534.2U CN201420531534U CN204144967U CN 204144967 U CN204144967 U CN 204144967U CN 201420531534 U CN201420531534 U CN 201420531534U CN 204144967 U CN204144967 U CN 204144967U
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- 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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Abstract
The utility model provides a kind of large-sized photovoltaic grid-connected system based on MMC, is multistage grid-connected system, mainly comprises photovoltaic array, DC-DC conversion circuit, MMC and transformer etc.MMC comprises the submodule of multiple series connection, can realize higher voltage and power grade, is mainly used in the feed-in network system of HVDC (High Voltage Direct Current) transmission system and wind energy turbine set at present.The unit of the utility model photovoltaic array, DC-DC conversion circuit and MMC submodule composition is called PSM.MMC is applied to photovoltaic parallel in system by the utility model, photovoltaic parallel in system based on MMC is often made up of upper and lower two brachium pontis, each brachium pontis is composed in series by a N number of PSM and reactor L, by this structure, not only can improve the solar energy utilization ratio of photovoltaic array, also can meet the requirement large to photovoltaic DC-to-AC converter monomer capacity, electric pressure is high, reduce the harmonic pollution of electrical network, realize the independent control of active reactive, and without the need to carrying out reactive power compensation.
Description
Technical field
The utility model relates to the application of converter in photovoltaic parallel in system, the especially application of MMC in large-scale photovoltaic grid-connected system.
Background technology
Along with energy crisis and environmental pollution are day by day serious, a kind of new clean reproducible energy of urgent searching, solar energy power generating belongs to clean regenerative resource, and the application of photovoltaic generation plays an important role for alleviating energy crisis and minimizing environmental pollution.At present, the every technology of photovoltaic generation has been tending towards ripe, the maximization of photovoltaic plant and and networking will be developing direction from now on and research emphasis.Such as, but along with developing rapidly of photovoltaic industry, the significantly lifting of photovoltaic generation capacity, some problems also highlight accordingly, and photovoltaic array generating efficiency is low, parallel network power generation is large to electric network influencing, combining inverter need meet higher requirement etc.In large-sized photovoltaic grid-connected system, the quantity of photovoltaic array is ten hundreds of, improves the solar energy utilization ratio of photovoltaic array to greatest extent, allows it be operated in maximum power state as far as possible, will increase substantially the generating efficiency of photovoltaic system.In photovoltaic parallel in system, the DC conversion that photovoltaic battery panel sends by inverter becomes alternating current and sends into electrical network, the key equipment of core is belonged in photovoltaic system, multi-level converter is owing to can export multiple level alternating voltage, make the harmonic content in grid-connected current little, be used widely to electric network pollution is less, the clamped formula multi-level converter of current main application increases along with level number, its clamped device sharply increases, and control complicated, be generally limited in 5 level and following in practical application; And modular multi-level converter is due to its modular construction, switching device and level number linearly increase, therefore when level number is more, required device will be less than the many level of clamped formula, control simple, modular structure makes its autgmentability strong, easily realizes Redundant Control, be applied to photovoltaic system, compared to the many level of clamped formula, there is certain advantage.
Utility model content
In order to make up the defect of prior art, provide a kind of large-sized photovoltaic grid-connected system based on MMC that can reduce clamped formula multi-level converter main circuit number of devices.
The utility model is achieved through the following technical solutions:
A kind of large-sized photovoltaic grid-connected system based on MMC, comprise photovoltaic array, DC-DC conversion circuit, DC-AC translation circuit and three phase network, solar energy is converted to the input as described DC-DC conversion circuit of the voltage that exports after electric energy by described photovoltaic array, described DC-DC conversion circuit includes BOOST circuit, MPPT controller, pi regulator and PWM generator, described MPPT controller detects electric current and the output voltage of described photovoltaic array, by the instruction of the adjusted photovoltaic array quiescent potential of MPPT control algolithm, described instruction and photovoltaic array output voltage values are subtracted each other, and carry out closed-loop control by described pi regulator, produce pwm control signal, the input voltage of pwm control signal to DC-DC conversion circuit controls, photovoltaic array obtains MPPT and controls, system is in initial condition, photovoltaic array through DC-DC circuit to electric capacity precharge, each submodule is unlocked after the capacitance voltage on each submodule reaches predetermined value, during system worked well, photovoltaic array exports and still continues to capacitor charging through DC-DC circuit, is at this moment controlled each submodule of MMC by pulse modulation technology, triggers the switching device on the corresponding submodule of each phase brachium pontis, control input and the excision of each SM, consistent and constant to ensure the capacitance voltage on each submodule, described DC-AC translation circuit includes three-phase three bridge arm circuit, described three-phase three bridge arm circuit is often made up of upper and lower two brachium pontis, described each upper brachium pontis and lower brachium pontis include the reactor of a N number of PSM and current limliting, N number of PSM connects successively with current limiting reactor, described PSM is photovoltaic array, DC-DC conversion circuit and MMC submodule composition, described MMC submodule is a half-bridge circuit, be connected with described DC-DC converter output, described photovoltaic array is connected with described DC-DC converter input, the upper brachium pontis of three described brachium pontis and the intermediate node of lower brachium pontis connect the three-phase input end of described three phase network respectively.
BOOST circuit in described DC-DC conversion circuit also can be BUCK circuit or BUCK-BOOST circuit.
Described MMC submodule is the half-bridge circuit that two switching devices and a storage capacitor are formed, switching device one is the output of submodule with the node in the middle of switching device two, the lower end of half brachium pontis is the input of submodule, each submodule is according to exportable 0 voltage of switching device state and storage capacitor voltage, in submodule, each switching tube only bears submodule capacitor voltage, and the switching device of low voltage grade reaches higher electric pressure through submodule series connection.
In the utility model, upper bridge arm voltage is Uu
u
U＝N
U·U
C(1)
Lower bridge arm voltage is U
l
u
L＝N
L·U
C(2)
Wherein, N
u, N
lrepresent that upper brachium pontis and second arm seal in the number of submodule respectively, U
crepresent the capacitance voltage of single submodule inside;
By Kirchhoff's second law to upper and lower two equation column voltage equations, alternating voltage is Uv,
U
V+u
U＝0 (3)
-U
V+u
L＝0 (4)
Obtained by (3) and (4)
Namely the alternating voltage that difference that upper and lower bridge arm seals in submodule number can obtain expecting is changed.
The utility model has the advantages that:
1) be in series by multiple unit PSM, for the photovoltaic system of certain power grade, the scale of the photovoltaic array corresponding to each PSM is reduced by increasing unit number, the photovoltaic module number of required series connection in photovoltaic array can be reduced, to reduce the impact of uneven illumination on whole system, improve solar energy utilization ratio.
2) system inversion exports as many level, and harmonic content is few, can reduce the input of filter apparatus, does not even need filter apparatus when level number is enough high, and then reduces the harmonic pollution to access electrical network.
3) do not limit by power device, inverter power can reach any grade as required, and its inverter output voltage amplitude also can arbitrarily set as required.
4) system export active power and reactive power can control separately, system, without the need to extra reactive power compensation, can reduce input cost.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is PSM module circuit diagram.
Fig. 3 is DC-DC conversion circuit MPPT and photovoltaic voltage controller architecture figure.
Embodiment
As shown in Figure 1, a kind of large-sized photovoltaic grid-connected system based on MMC, comprise photovoltaic array 1, DC-DC conversion circuit 2, DC-AC translation circuit and three phase network 8, solar energy is converted to the input as described DC-DC conversion circuit of the voltage that exports after electric energy by described photovoltaic array, described DC-DC conversion circuit 2 includes BOOST circuit 3, MPPT controller 4, pi regulator 5 and PWM generator 6, described MPPT controller 4 detects electric current and the output voltage of described photovoltaic array 1, by the instruction of MPPT control algolithm adjusted photovoltaic array 1 quiescent potential, described instruction and photovoltaic array 1 output voltage values are subtracted each other, and carry out closed-loop control by described pi regulator 5, produce pwm control signal, the input voltage of pwm control signal to DC-DC conversion circuit controls, photovoltaic array obtains MPPT and controls, system is in initial condition, photovoltaic array 1 gives electric capacity precharge through DC-DC conversion circuit 1, each submodule is unlocked after the capacitance voltage on each MMC submodule 7 reaches predetermined value, during system worked well, photovoltaic array exports and still continues to capacitor charging through DC-DC circuit, at this moment by pulse modulation technology, each submodule of MMC is controlled, trigger the switching device on the corresponding submodule of each phase brachium pontis, control input and the excision of each SM7, consistent and constant to ensure the capacitance voltage on each submodule, described DC-AC translation circuit includes three-phase three bridge arm circuit, described three-phase three bridge arm circuit is often made up of upper and lower two brachium pontis, described each upper brachium pontis and lower brachium pontis include the reactor of a N number of PSM and current limliting, N number of PSM connects successively with current limiting reactor, described PSM is photovoltaic array 1, DC-DC conversion circuit 2 and MMC submodule 7 form, described MMC submodule 7 is a half-bridge circuit, be connected with described DC-DC conversion circuit 2 output, described photovoltaic array 1 is connected with described DC-DC conversion circuit 2 input, the upper brachium pontis of three described brachium pontis and the intermediate node of lower brachium pontis connect the three-phase input end of described three phase network 8 respectively.
BOOST circuit 3 in described DC-DC conversion circuit 2 also can be BUCK circuit or BUCK-BOOST circuit.
Described MMC submodule 7 is the half-bridge circuit that two switching devices and a storage capacitor are formed, switching device one is the output of submodule with the node in the middle of switching device two, the lower end of half brachium pontis is the input of submodule, each submodule is according to exportable 0 voltage of switching device state and storage capacitor voltage, in submodule, each switching tube only bears submodule capacitor voltage, and the switching device of low voltage grade reaches higher electric pressure through submodule series connection.
Claims (3)
1. the large-sized photovoltaic grid-connected system based on MMC, it is characterized in that: comprise photovoltaic array, DC-DC conversion circuit, DC-AC translation circuit and three phase network, solar energy is converted to the input as described DC-DC conversion circuit of the voltage that exports after electric energy by described photovoltaic array, described DC-DC conversion circuit includes BOOST circuit, MPPT controller, pi regulator and PWM generator, described MPPT controller detects electric current and the output voltage of described photovoltaic array, by the instruction of the adjusted photovoltaic array quiescent potential of MPPT control algolithm, described instruction and photovoltaic array output voltage values are subtracted each other, and carry out closed-loop control by described pi regulator, produce pwm control signal, the input voltage of pwm control signal to DC-DC conversion circuit controls, photovoltaic array obtains MPPT and controls, system is in initial condition, photovoltaic array through DC-DC circuit to electric capacity precharge, each submodule is unlocked after the capacitance voltage on each submodule reaches predetermined value, during system worked well, photovoltaic array exports and still continues to capacitor charging through DC-DC circuit, is at this moment controlled each submodule of MMC by pulse modulation technology, triggers the switching device on the corresponding submodule of each phase brachium pontis, control input and the excision of each SM, consistent and constant to ensure the capacitance voltage on each submodule, described DC-AC translation circuit includes three-phase three bridge arm circuit, described three-phase three bridge arm circuit is often made up of upper and lower two brachium pontis, described each upper brachium pontis and lower brachium pontis include the reactor of a N number of PSM and current limliting, N number of PSM connects successively with current limiting reactor, described PSM is photovoltaic array, DC-DC conversion circuit and MMC submodule composition, described MMC submodule is a half-bridge circuit, be connected with described DC-DC converter output, described photovoltaic array is connected with described DC-DC converter input, the upper brachium pontis of three described brachium pontis and the intermediate node of lower brachium pontis connect the three-phase input end of described three phase network respectively.
2. the large-sized photovoltaic grid-connected system based on MMC according to claim 1, is characterized in that: the BOOST circuit in described DC-DC conversion circuit also can be BUCK circuit or BUCK-BOOST circuit.
3. the large-sized photovoltaic grid-connected system based on MMC according to claim 1, it is characterized in that: described MMC submodule is the half-bridge circuit that two switching devices and a storage capacitor are formed, switching device one is the output of submodule with the node in the middle of switching device two, the lower end of half brachium pontis is the input of submodule, and each submodule is according to exportable 0 voltage of switching device state and storage capacitor voltage.
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| CN201420531534.2U CN204144967U (en) | 2014-09-16 | 2014-09-16 | Based on the large-sized photovoltaic grid-connected system of MMC |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375509A (en) * | 2015-09-21 | 2016-03-02 | 北京科诺伟业科技股份有限公司 | A star-type three-phase alternating current series-connection photovoltaic array |
| CN105656425A (en) * | 2016-03-08 | 2016-06-08 | 王冠林 | Array power generation circuit based on solar optimizer module |
| CN105680686A (en) * | 2015-08-03 | 2016-06-15 | 许昌开普电气研究院 | MMC-based novel topological structure for photovoltaic power generation system |
| CN106941315A (en) * | 2016-12-02 | 2017-07-11 | 中国电力科学研究院 | A kind of Modular multilevel converter MMC precharge control methods and its control device |
| CN107104496A (en) * | 2017-07-02 | 2017-08-29 | 天津飞眼无人机科技有限公司 | Photo-voltaic power supply module for unmanned plane |
| CN107221946A (en) * | 2017-05-31 | 2017-09-29 | 上海电力设计院有限公司 | Utilize the new energy flexible direct current delivery system and verification method of wind light mutual complementing characteristic |
| CN108988631A (en) * | 2017-05-30 | 2018-12-11 | Abb瑞士股份有限公司 | Converter battery with integrated photovoltaic cells |
| CN109683535A (en) * | 2019-01-18 | 2019-04-26 | 湖北唐人科技有限公司 | A kind of anti-shading circuit of photovoltaic panel for transmission line of electricity monitoring |
| CN111313472A (en) * | 2020-03-31 | 2020-06-19 | 国网安徽省电力有限公司六安供电公司 | High-efficiency module combined photovoltaic inverter |
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- 2014-09-16 CN CN201420531534.2U patent/CN204144967U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680686A (en) * | 2015-08-03 | 2016-06-15 | 许昌开普电气研究院 | MMC-based novel topological structure for photovoltaic power generation system |
| CN105375509A (en) * | 2015-09-21 | 2016-03-02 | 北京科诺伟业科技股份有限公司 | A star-type three-phase alternating current series-connection photovoltaic array |
| CN105375509B (en) * | 2015-09-21 | 2017-12-19 | 北京科诺伟业科技股份有限公司 | Star-like three-phase alternating current tandem photovoltaic square formation |
| CN105656425A (en) * | 2016-03-08 | 2016-06-08 | 王冠林 | Array power generation circuit based on solar optimizer module |
| CN106941315A (en) * | 2016-12-02 | 2017-07-11 | 中国电力科学研究院 | A kind of Modular multilevel converter MMC precharge control methods and its control device |
| CN108988631A (en) * | 2017-05-30 | 2018-12-11 | Abb瑞士股份有限公司 | Converter battery with integrated photovoltaic cells |
| CN108988631B (en) * | 2017-05-30 | 2024-05-14 | 日立能源有限公司 | Converter cell with integrated photovoltaic cells |
| CN107221946A (en) * | 2017-05-31 | 2017-09-29 | 上海电力设计院有限公司 | Utilize the new energy flexible direct current delivery system and verification method of wind light mutual complementing characteristic |
| CN107104496A (en) * | 2017-07-02 | 2017-08-29 | 天津飞眼无人机科技有限公司 | Photo-voltaic power supply module for unmanned plane |
| CN107104496B (en) * | 2017-07-02 | 2023-06-27 | 天津飞眼无人机科技有限公司 | Photovoltaic power module for unmanned aerial vehicle |
| CN109683535A (en) * | 2019-01-18 | 2019-04-26 | 湖北唐人科技有限公司 | A kind of anti-shading circuit of photovoltaic panel for transmission line of electricity monitoring |
| CN111313472A (en) * | 2020-03-31 | 2020-06-19 | 国网安徽省电力有限公司六安供电公司 | High-efficiency module combined photovoltaic inverter |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150204 Termination date: 20150916 |
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| EXPY | Termination of patent right or utility model |