CN201178315Y - Electricity transmission and interconnecting system of large solar electric power generation system - Google Patents

Electricity transmission and interconnecting system of large solar electric power generation system Download PDF

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Publication number
CN201178315Y
CN201178315Y CNU200820019677XU CN200820019677U CN201178315Y CN 201178315 Y CN201178315 Y CN 201178315Y CN U200820019677X U CNU200820019677X U CN U200820019677XU CN 200820019677 U CN200820019677 U CN 200820019677U CN 201178315 Y CN201178315 Y CN 201178315Y
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China
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connected
system
output
module
change
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CNU200820019677XU
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Chinese (zh)
Inventor
卢祥明
余民
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济南新吉纳远程测控有限公司
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Publication of CN201178315Y publication Critical patent/CN201178315Y/en

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Abstract

The utility model discloses an electric energy transmission and interconnection system for a large-scale solar power generation system, solves the problem on the limit of the solar application due to the method shortage of the transmission and the interconnection in the prior art of the solar power generation, has simple structure, and can effectively satisfy the requirement of the solar power generation. The system is structurally characterized in that a plurality of solar cell panels are provided, each of which is connected with an electric energy transmission bus via respective intelligent voltage conversion module thereof; the electric energy transmission bus is connected with an inversion power supply and an intelligent switching circuit which are connected with an accumulator battery and have output terminals connected with a matching system, and the matching system and the inversion power supply as well as the intelligent switching circuit form a feedback system; and the output terminal of the matching system is connected with a switching system which is respectively interconnected with a national power network and/or connected with a service power system.

Description

Large-sized solar electricity generation system electric energy transmitting and grid-connected system

Technical field

The utility model relates to a kind of large-sized solar electricity generation system electric energy transmitting and grid-connected system.

Technical background

Growing along with energy scarcity and heliotechnics, solar energy will become one of main energy sources.The large-sized solar power plant will progressively be set up, and solar panel will be installed in the surface of owned building, and insert the system of State Grid in the back of being incorporated into the power networks.Yet, large-scale even huge solar power system or new things, its electric energy transmitting does not also have ripe method with being incorporated into the power networks, and the utility model proposes a kind of solar energy-electric energy transmission and grid-connected system.

Summary of the invention

The purpose of this utility model is exactly to lack transmission and combination method at present in order to solve in solar energy generation technology, problem such as cause that Application of Solar Energy is restricted, provide that a kind of to have method simple, can effectively satisfy the large-sized solar electricity generation system electric energy transmitting and the grid-connected system of advantages such as solar power generation needs.

For achieving the above object, the utility model adopts following technical scheme:

A kind of large-sized solar electricity generation system electric energy transmitting and grid-connected system, its several solar panel, each solar panel passes through intelligent voltage modular converter and electric energy transmitting bus parallel connection separately; The electric energy transmitting bus is connected with inverter with the intelligence switching, and intelligent switching is connected with batteries with inverter, and its output is connected with matching system simultaneously, and matching system switches with intelligence and inverter formation reponse system; The matching system output is connected with the switched system system, switched system then be incorporated into the power networks with national grid respectively and/or be connected from using electricity system.

Described intelligent voltage modular converter structure is that it is made up of control module MCU, PWM voltage transformation module, step-up DC-DC module, input voltage conditioning and A/D change-over circuit, input current conditioning and A/D change-over circuit, output voltage conditioning and A/D change-over circuit, output current conditioning and A/D change-over circuit, output isolation module; Control module MCU is connected the value of collection A/D with the conditioning of, input voltage with A/D change-over circuit, input current conditioning and A/D change-over circuit, output voltage conditioning and A/D change-over circuit, output current conditioning respectively with the A/D change-over circuit; The output of control module MCU is connected with PWM voltage transformation module, and PWM voltage transformation module then is connected with step-up DC-DC module; Step-up DC-DC module input is connected with solar panel by two leads, and output is connected with isolation module by two leads, and the isolation module output is connected with the transmission of electricity bus; Be provided with the input current sample resistance on a lead of step-up DC-DC module and solar panel, input current sample resistance two ends are connected with the A/D change-over circuit with the input current conditioning; Also nurse one's health with two leads between solar panel in step-up DC-DC module simultaneously and be connected with the A/D change-over circuit with input voltage; A lead between step-up DC-DC module and isolation module is provided with the output current sample resistance, and its two ends are connected with the A/D change-over circuit with the output current conditioning; Step-up DC-DC module is also nursed one's health with output voltage with two leads between isolation module and is connected with the A/D change-over circuit simultaneously; Control module MCU gathers the value of four road A/D change-over circuits, according to output voltage values, control PWM voltage transformation module is adjusted step-up DC-DC module earlier, making output voltage is between the 33-36V, output voltage is finely tuned in scanning again, finding input current and input voltage is that the maximum that solar panel is exported is amassed, and dynamically follows the tracks of, and makes the solar panel Maximum Power Output; In solar panel power output maximum, but can not externally export electric energy the time, do not guarantee enough output voltages; And, when needing output to exceed the 36V output voltage,, do not exceed 36V even depart from maximum power point when coupling solar panel power output yet.

Described electric energy transmitting bus is the transmission of two-wire system bus mode, adopts direct current 36V voltage on the bus.

The intelligent commutation circuit that intelligence is switched and inverter is made up of SPWM inverter and high-power IGBT module constitutes.

Basic skills of the present utility model is: intelligent voltage modular converter of configuration on each unit solar cells plate, make its delivery efficiency the highest, and can polylith solar panel mutually and the direct current 36V safe voltage that connects, with bus mode all unit solar cells plates are coupled together, concentrate with single-point or multiple spot and convert to and the present consistent single-phase or three-phase alternating current of performance, and adopt traditional electric power and net mode to insert national grid, if the household solar energy electricity generation system also can not incorporated State Grid's net into, directly insert former supply line and use.

Wherein, the intelligent voltage modular converter, it must possess following function and characteristics: the one, the high efficiency conversion makes the transition loss minimum; The 2nd, the power of sunlight no matter, module all can be exported the maximum power under this sunlight automatically; The 3rd, have defencive function, under situations such as output short-circuit, Leaked Current of Line to Ground, stop external power supply; The external unidirectional isolation of module can be at the electric energy on the drain bus under the situation about damaging; The 4th, convert the 36V direct voltage to, guarantee safety on the one hand, the person is not being constituted dangerous situation loss minimum on the other hand; The 5th, no matter how many intelligent voltage modular converters all can directly and connect.

The bus mode transmission of electricity has following benefit: the one, and make each unit solar cells plate become separate unit, make supply line's wiring in order, be convenient to construction, maintenance, management; The 2nd, save the transmission of electricity wire rod, reduce cost.

Concentrate single-point or multiple spot to convert to single-phase or three-phase alternating current, be meant quantity, select the conversion of single-point or multiple spot, the less solar power system of scale is adopted the single-point conversion according to the power and the solar panel of inverter; To being on a grand scale, when an inverter power is not enough, adopt the multiple spot conversion.

About being incorporated into the power networks owing to convert the three-phase alternating current of standard to, be incorporated into the power networks and can continue to use the mode that is incorporated into the power networks in present power plant and carry out by single-point or multiple spot, or research more advanced and net mode.

About power storage, store in direct current 240V mode.

The beneficial effects of the utility model are: simple in structure, easy to use, can satisfy the requirement of present solar power generation power supply.

Description of drawings

Fig. 1 is the structural representation of the utility model system;

Fig. 2 is an intelligent voltage modular converter structural representation.

Wherein, 1. solar panel, 2. intelligent voltage modular converter, 3. inverter and intelligent commutation circuit, 4. batteries, 5. matching system, 6. switched system, 7. step-up DC-DC module, 8. output isolation module, 9. input current conditioning and A/D change-over circuit, 10. input voltage is nursed one's health and the A/D change-over circuit, 11.PWM voltage transformation module, 12. output current conditioning and A/D change-over circuit, conditioning of 13. output voltages and A/D change-over circuit, 14. input current sample resistances, 15. the output current sample resistance, 16. control module MCU.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Among Fig. 1, large-sized solar electricity generation system electric energy transmitting and grid-connected system, its several solar panel 1, each solar panel 1 passes through intelligent voltage modular converter 2 and electric energy transmitting bus parallel connection separately; The electric energy transmitting bus is connected with intelligent commutation circuit 3 with inverter, and inverter is connected with batteries 4 with intelligent commutation circuit 3, and its output is connected with matching system 5 simultaneously, and matching system 5 constitutes reponse system with inverter and intelligent commutation circuit 3; Matching system 5 outputs are connected with switched system system 6,6 of switched systems be incorporated into the power networks with national grid respectively and/or be connected from using electricity system.

Intelligent voltage modular converter 2 structures are that it is made up of control module MCU 16, PWM voltage transformation module 11, step-up DC-DC module 7, input voltage conditioning and A/D change-over circuit 10, input current conditioning and A/D change-over circuit 9, output voltage conditioning and A/D change-over circuit 13, output current conditioning and A/D change-over circuit 12, output isolation module 8; Control module MCU16 is connected 12 with A/D change-over circuit 10, input current conditioning and A/D change-over circuit 9, output voltage conditioning and A/D change-over circuit 13, output current conditioning with the A/D change-over circuit with the input voltage conditioning respectively, gathers the value of A/D; The output of control module MCU16 is connected with PWM voltage transformation module 11, and 11 of PWM voltage transformation modules are connected with step-up DC-DC module 7; Step-up DC-DC module 7 inputs are connected with solar panel 1 by two leads, and output is connected with output isolation module 8 by two leads, and output isolation module 8 outputs are connected with the transmission of electricity bus; Be provided with input current sample resistance 14 on a lead of step-up DC-DC module 7 and solar panel 1, input current sample resistance 14 two ends are connected with A/D change-over circuit 9 with the input current conditioning; Two leads 1 of step-up DC-DC module 7 and solar panel also are connected with A/D change-over circuit 10 with the input voltage conditioning simultaneously; The lead that step-up DC-DC module 7 and output isolation module are 8 is provided with output current sample resistance 15, and its two ends are connected with A/D change-over circuit 12 with the output current conditioning; Step-up DC-DC module 7 also is connected with A/D change-over circuit 13 with the output voltage conditioning with two leads of 8 of output isolation modules simultaneously.The electric energy transmitting bus is the transmission of two-wire system bus mode, adopts direct current 36V voltage on the bus.

The intelligent voltage modular converter course of work is as follows: MCU gathers the value of four road A/D, according to output voltage values, control PWM adjusts the DC-DC circuit earlier, making output voltage is between the 33-36V, output voltage is finely tuned in scanning again, find the maximum of input current and input voltage (solar panel output) long-pending, and dynamically follow the tracks of, make the solar panel Maximum Power Output.In solar panel power output maximum, but can not externally export electric energy the time, do not guarantee enough output voltages; And, when needing output to exceed the 36V output voltage,, do not exceed 36V even depart from maximum power point when coupling solar panel power output yet.In the block diagram, MCU is a CPU; PWM is present voltage transformation mode least in power-consuming; The collection of output current is used for overcurrent protection, and promptly when output current excessive (if any short circuit and electric leakage), MCU control PWM adjusts the DC-DC reduction even turn-offs output voltage; Isolation module guarantees the unidirectional power supply of bus, when this module damage, can the loss bus on electric energy, for reducing the wastage, adopt low-resistance field effect transistor and Schottky diode etc.The employing of above-mentioned aggregate measures can make the polylith solar panel and connects, thereby realizes the bus transmission of electricity.

Concentrate single-point or multiple spot to convert to single-phase or three-phase alternating current, be meant quantity, select the conversion of single-point or multiple spot, the less solar power system of scale is adopted the single-point conversion according to the power and the solar panel of inverter; To being on a grand scale, when an inverter power is not enough, adopt the multiple spot conversion.

About inverter and intelligent commutation circuit, inverter adopts the SPWM mode, and intelligent commutation circuit adopts modules such as high-power IGBT.

About being incorporated into the power networks owing to convert the three-phase alternating current of standard to, be incorporated into the power networks and can continue to use the mode that is incorporated into the power networks in present power plant and carry out by single-point or multiple spot, or research more advanced and net mode.

About power storage, store in direct current 240V mode.

In the utility model all the other not detailed description be known technology and repeat no more.

Claims (4)

1, a kind of large-sized solar electricity generation system electric energy transmitting and grid-connected system is characterized in that: its several solar panel, and each solar panel passes through intelligent voltage modular converter and electric energy transmitting bus parallel connection separately; The electric energy transmitting bus is connected with intelligent commutation circuit with inverter, and inverter is connected with batteries with intelligent commutation circuit, and its output is connected with matching system simultaneously, and matching system and inverter and intelligent commutation circuit constitute reponse system; The matching system output is connected with switched system, switched system then be incorporated into the power networks with national grid respectively and/or be connected from using electricity system.
2, large-sized solar electricity generation system electric energy transmitting according to claim 1 and grid-connected system is characterized in that: described intelligent voltage modular converter structure is made up of control module MCU, PWM voltage transformation module, step-up DC-DC module, input voltage conditioning and A/D change-over circuit, input current conditioning and A/D change-over circuit, output voltage conditioning and A/D change-over circuit, output current conditioning and A/D change-over circuit, output isolation module for it; Control module MCU is connected with the A/D change-over circuit with A/D change-over circuit, input current conditioning and A/D change-over circuit, output voltage conditioning and A/D change-over circuit, output current conditioning with the input voltage conditioning respectively, gathers the value of A/D; The output of control module MCU is connected with PWM voltage transformation module, and PWM voltage transformation module then is connected with step-up DC-DC module; Step-up DC-DC module input is connected with solar panel by two leads, and output is connected with isolation module by two leads, and the isolation module output is connected with the transmission of electricity bus; Be provided with the input current sample resistance on a lead of step-up DC-DC module and solar panel, input current sample resistance two ends are connected with the A/D change-over circuit with the input current conditioning; Also nurse one's health with two leads between solar panel in step-up DC-DC module simultaneously and be connected with the A/D change-over circuit with input voltage; A lead between step-up DC-DC module and isolation module is provided with the output current sample resistance, and its two ends are connected with the A/D change-over circuit with the output current conditioning; Step-up DC-DC module is also nursed one's health with output voltage with two leads between isolation module and is connected with the A/D change-over circuit simultaneously; Control module MCU gathers the value of four road A/D change-over circuits, according to output voltage values, control PWM voltage transformation module is adjusted step-up DC-DC module earlier, making output voltage is between the 33-36V, output voltage is finely tuned in scanning again, finding input current and input voltage is that the maximum that solar panel is exported is amassed, and dynamically follows the tracks of, and makes the solar panel Maximum Power Output; In solar panel power output maximum, but can not externally export electric energy the time, do not guarantee enough output voltages; And, when needing output to exceed the 36V output voltage,, do not exceed 36V even depart from maximum power point when coupling solar panel power output yet.
3, large-sized solar electricity generation system electric energy transmitting according to claim 1 and grid-connected system is characterized in that: described electric energy transmitting bus is the transmission of two-wire system bus mode, adopts direct current 36V voltage on the bus.
4, large-sized solar electricity generation system electric energy transmitting according to claim 1 and grid-connected system is characterized in that: the intelligent commutation circuit that described inverter and intelligent commutation circuit are made up of SPWM inverter and high-power IGBT module constitutes.
CNU200820019677XU 2008-04-01 2008-04-01 Electricity transmission and interconnecting system of large solar electric power generation system CN201178315Y (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102460890A (en) * 2009-06-11 2012-05-16 松下电器产业株式会社 Utility interconnection system
CN104135218A (en) * 2009-05-19 2014-11-05 最大输出可再生能源公司 Architecture for power plant comprising clusters of power-generation devices
CN104639028A (en) * 2013-11-14 2015-05-20 罗伯特·博世有限公司 Photovoltaic system and method for operating same
US9407093B2 (en) 2007-08-22 2016-08-02 Maxout Renewables, Inc. Method for balancing circuit voltage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9300133B2 (en) 2007-08-22 2016-03-29 Maxout Renewables, Inc. Central inverters
US9407093B2 (en) 2007-08-22 2016-08-02 Maxout Renewables, Inc. Method for balancing circuit voltage
CN104135218A (en) * 2009-05-19 2014-11-05 最大输出可再生能源公司 Architecture for power plant comprising clusters of power-generation devices
CN102460890A (en) * 2009-06-11 2012-05-16 松下电器产业株式会社 Utility interconnection system
CN104639028A (en) * 2013-11-14 2015-05-20 罗伯特·博世有限公司 Photovoltaic system and method for operating same

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GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20090107

Effective date of abandoning: 20080401