CN202261081U - Solar photovoltaic grid-connected and grid-disconnected hybrid power generating system - Google Patents
Solar photovoltaic grid-connected and grid-disconnected hybrid power generating system Download PDFInfo
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- CN202261081U CN202261081U CN2011201555610U CN201120155561U CN202261081U CN 202261081 U CN202261081 U CN 202261081U CN 2011201555610 U CN2011201555610 U CN 2011201555610U CN 201120155561 U CN201120155561 U CN 201120155561U CN 202261081 U CN202261081 U CN 202261081U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model relates to a solar photovoltaic grid-connected and grid-disconnected hybrid power generating system. The system comprises a controller, a solar battery array, a storage battery group, a direct-current emergency load, a grid-connected inverter and the like, and is characterized in that: the controller comprises a running mode control unit (201), a highest power point tracer, a middle-voltage direct-current bus (202), a direct-current buck converter, a low-voltage direct-current bus (203), a charging and discharging controller, an emergency output switch relay J1 and the like. Most of the direct-current electric energy output by the solar battery array is converted into alternating-current electric energy through the grid-connected inverter; the alternating-current electric energy is sent to a public distribution network; and a small part of the direct-current electric energy is provided to the direct-current emergency load and the storage battery group through the direct-current buck converter and the low-voltage direct-current bus (203). When the voltage of the low-voltage direct-current bus (203) is beyond a normal range, the storage battery group provides the energy to the direct-current emergency load. By the grid-connected and grid-disconnected hybrid power generating system, the efficiency of the system is improved and the power generation time of the system is prolonged. The system has a good application prospect.
Description
Technical field
The present invention relates to a kind of solar energy power generating and use, especially can be the master to generate electricity by way of merging two or more grid systems, can also leave the mixed light photovoltaic generating system that net generates electricity simultaneously.
Background technology
Solar energy power generating can replace and less with fossil energy such as resource-constrained, non-renewable coal, oil, natural gas with by its secondary energy sources that convert to.The popularization solar energy power generating is used, and is to consumption figure and the optimization energy resource structure that reduces fossil energy, significant.
Solar energy power generating does not damage the discharging of the pollutant of atmosphere and biological environment, is clean energy resource, the green energy resource of coordinating mutually with the biological environment that the mankind depend on for existence.The popularization solar energy power generating is used, and can reduce the discharge capacity of pollutants such as CO2, SO2 and particle, to alleviating air pollution and preserving the ecological environment the very big effect of performance.
At present, known solar photovoltaic generation system can be divided into grid-connected system and leave the net electricity generation system according to the operational mode difference of system.
Solar energy grid-connected photovoltaic system is made up of solar cell array, combining inverter and public power distribution network etc.Solar energy converts direct current energy to through solar cell array, converts direct current energy into AC energy through combining inverter again, its electric current and public power distribution network voltage same frequency, same-phase.Solar energy grid-connected photovoltaic system can work in the area of utility network, and not needing energy storage device is the big advantage of one of which.
Photovoltaic from the net electricity generation system generally by solar cell array, DC/DC converter, charging-discharging controller, batteries, form from net inverter etc.Solar cell array becomes direct current energy with the solar energy converting that receives; Control through the DC/DC converter realizes MPPT maximum power point tracking; Then with the output electrical power storage of photovoltaic array in batteries, batteries offers energy DC load or is transformed to alternating current through the DC/AC inverter again through charging-discharging controller supplies with AC load.Photovoltaic is the electricity consumption solution that can adapt to areas without electricity from the net electricity generation system.
, for the type system of generating electricity by way of merging two or more grid systems, when distribution network failure, be the control island effect, combining inverter will not be allowed to work, and the convertible electric energy of solar cell array is not utilized yet; And for from net power generation type system, when batteries has been filled, and electric loading of no use, this moment solar cell array because there is not output loading, can not generate electricity, the convertible electric energy of solar cell array is not utilized.
To single solar energy grid-connected photovoltaic system with from the deficiency of netting electricity generation system, " solar photovoltaic grid-connection is from the net hybrid power system " invention for improving the utilance of solar cell array under the various complicated service conditionss, is disclosed.
Solar photovoltaic grid-connection can be applicable to and build occasions such as integrated solar grid-connected electricity generation system, domestic solar roof electricity generation system from the net hybrid power system.
Summary of the invention
The objective of the invention is to improve user's emergency load power supply reliability simultaneously, designed a kind of solar photovoltaic grid-connection from the net hybrid power system in order to make full use of the generating capacity of solar cell array.
Solar photovoltaic grid-connection is made up of solar cell array, controller, batteries, direct current emergency load, combining inverter, public power distribution network etc. from the net hybrid power system.The input of the output termination controller of solar cell array, said controller have three tunnel outputs, and its first via output connects the direct current emergency load; Its second tunnel output connects batteries; Its Third Road output connects public power distribution network through combining inverter; Solar photovoltaic grid-connection is characterised in that controller from the net hybrid power system; Comprise: operational mode control unit (201), anti-electric current pour in down a chimney diode D3, MPPT maximum power point tracking device, middle straightening stream bus (202), DC decompression converter, low-voltage direct bus (203), charging-discharging controller, emergent output transfer relay J1; The input of controller pours in down a chimney the input that diode D3 connects the MPPT maximum power point tracking device through anti-electric current; Straightening stream bus (202) in the output termination of said MPPT maximum power point tracking device, said middle straightening stream bus (202) connects the Third Road output of controller; Straightening stream bus (202) also connects low-voltage direct bus (203) through the DC decompression converter in said; Said low-voltage direct bus (203) connects the first via output of controller through the normally opened contact of emergent output transfer relay J1; Said low-voltage direct bus (203) also connects the input of charging-discharging controller; Said charging-discharging controller has two tunnel outputs; Its first via output is exported through the first via that the emergent normally-closed contact of exporting transfer relay J1 connects controller, and its second tunnel output connects the second tunnel output of controller.Solar cell array becomes direct current energy with the solar energy converting that receives, and realizes its MPPT maximum power point tracking through the control to the DC/DC converter in the controller.Most of direct current energy flows the input that bus offers combining inverter through the middle straightening in the controller, and through combining inverter the AC energy that direct current energy converts the satisfied condition that is incorporated into the power networks into is sent into public power distribution network; The fraction direct current energy offers low-voltage direct bus (203) through middle straightening stream bus (202) and the DC decompression converter in the controller, and low-voltage direct bus (203) offers the direct current emergency load with its part, and another part is stored in the batteries.When low-voltage direct bus (203) voltage in the controller was outside the normal range of operation value, batteries offered the direct current emergency load through the charging-discharging controller in the controller with energy, guarantees the reliable power supply of direct current emergency load all the time.
Solar photovoltaic grid-connection has the function that is incorporated into the power networks from the net mixed power generation from the net hybrid power system, is main to generate electricity by way of merging two or more grid systems, simultaneously can also be from the net generating.Even when distribution network failure; Be the control island effect; Combining inverter is not allowed to work,, can also flow bus and DC decompression converter through the middle straightening in the controller by direct current emergency load and batteries utilization through the direct current energy that solar cell array is changed; Improve the utilance of solar cell, guaranteed the reliable power supply of direct current emergency load.
Solar photovoltaic grid-connection has reduced the transformation of electrical energy link from the net hybrid power system, has improved system effectiveness; Solar photovoltaic grid-connection has effectively improved system's year generating dutation from the net hybrid power system, has improved system's annual energy output.Solar photovoltaic grid-connection has effectively utilized the clean energy resource that solar cell array provides under the various complicated service conditionss from the net hybrid power system, has a good application prospect.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is that solar photovoltaic grid-connection leaves net hybrid power system sketch map.
Fig. 2 is that solar photovoltaic grid-connection leaves net hybrid power system middle controller sketch map.
Fig. 3 is the relay control flow chart of operational mode control unit (201) in the controller.
Embodiment
1, solar photovoltaic grid-connection is from the circuit topology of net hybrid power system
In Fig. 1, described solar photovoltaic grid-connection from the composition of net hybrid power system be connected.The input of the output termination controller of solar cell array, said controller have three tunnel outputs, and its first via output connects direct current emergency load (like power-type LED lighting load, movable electrical appliances charger etc.); Its second tunnel output connects batteries; Its Third Road output connects the input of combining inverter, and the output of said combining inverter connects public power distribution network.
In Fig. 2, the composition of having described solar photovoltaic grid-connection critical component-controller in the net hybrid power system is connected with inner.
The composition of controller is: operational mode control unit, anti-electric current pour in down a chimney diode D3, MPPT maximum power point tracking device, middle straightening stream bus (202), DC decompression converter, low-voltage direct bus (203), charging-discharging controller, emergent output transfer relay J1.
The inside of controller connects: the input of controller pours in down a chimney the input that diode D3 connects the MPPT maximum power point tracking device through anti-electric current; Straightening stream bus (202) in the output termination of said MPPT maximum power point tracking device, said middle straightening stream bus (202) connects the Third Road output of controller; Straightening stream bus (202) also connects low-voltage direct bus (203) through the DC decompression converter in said; Said low-voltage direct bus (203) connects the first via output of controller through the normally opened contact of emergent output transfer relay J1; Said low-voltage direct bus (203) also connects the input of charging-discharging controller; Said charging-discharging controller has two tunnel outputs; Its first via output is exported through the first via that the emergent normally-closed contact of exporting transfer relay J1 connects controller, and its second tunnel output connects the second tunnel output of controller.
In Fig. 2, the composition of operational mode control unit (201) in the controller has been described also.Comprise: solar cell array voltage sampling circuit, low-voltage direct bus (203) voltage sampling circuit and microcontroller MCU.
The rated value of middle straightening stream bus (202) voltage and the input of combining inverter adapt.
The rated value of low-voltage direct bus (203) voltage and the rated value of direct current emergency load adapt.
DC decompression converter using BUCK DC transfer circuit; Ratio according to low-voltage direct bus (203) voltage and middle straightening stream bus (202) voltage rating; Confirm the duty ratio of its switching device; Duty ratio at said its switching device of DC decompression converter duration of work is fixed all the time, and its output input direct voltage no-load voltage ratio also is constant.
It is main switching device that charging-discharging controller uses power MOSFET, and microcontroller MCU is a control circuit, and control charging peak current is full of and breaks off charge circuit and under-voltage disconnection discharge loop.
Combining inverter uses full-bridge inverter circuit to be main circuit, and digital signal processor DSP is a control circuit, and run duration has the automatic regulatory function of power output, and straightening stream busbar voltage is in working range in making.
2, solar photovoltaic grid-connection is from the energy management of net hybrid power system
For reaching the target that makes full use of the electric energy that solar cell array changes; Solar photovoltaic grid-connection is a multi-objective coordinated control strategy from the energy management strategy of net hybrid power system; Come common completion by operational mode control unit, MPPT maximum power point tracking device, charging-discharging controller, combining inverter, its concrete implementation method:
The controlled target of MPPT maximum power point tracking device is in intensity of solar radiation, ambient temperature, the maximum power output of realization solar cell array automatically when loading condition changes;
Charging-discharging controller control charging peak current breaks off charge circuit and breaks off discharge loop when under-voltage when being full of;
The combining inverter run duration has the automatic regulatory function of power output, and straightening stream bus (202) voltage is in working range in making;
The controlled target of operational mode control unit (201) is that the direct current energy of solar cell array conversion is given combining inverter simultaneously and given low-voltage direct bus (203) through buck converter, and low-voltage direct bus (203) is given direct current emergency load and storage battery again.Realized not possessing under the condition that is incorporated into the power networks, solar photovoltaic grid-connection still can provide clean energy resource for the direct current emergency load from the net hybrid power system.
The energy management strategy of solar photovoltaic grid-connection operational mode control unit (201) in the net hybrid power system has been described in Fig. 3.
Operational mode control unit (201) detects low-voltage direct busbar voltage Vdc; Calculate the mean value in the certain hour; According to described mean value, through driving switch pipe S1, confirm the coil electricity state of relay J 1 with the level mode; The contacts status of control relay J1, the source of the emergent output of decision.
When low-voltage direct bus (203) voltage Vdc_min＜Vdc＜Vdc_max; The S1 end output high level of operational mode control unit (201); The normally opened contact of emergent output transfer relay J1 is closed; Normally-closed contact breaks off, and the electric energy of emergent output is from low-voltage direct bus (203), promptly from the real-time generating of solar cell array; When low-voltage direct bus (203) voltage Vdc＜Vdc_min or Vdc＞Vdc_max; The S1 end output low level of operational mode control unit (201); The normally opened contact of emergent output transfer relay J1 breaks off; Normally-closed contact is closed, and the electric energy of emergent output is from the output of charging-discharging controller, promptly from the energy storage of batteries.
Claims (8)
1. a solar photovoltaic grid-connection is from the net hybrid power system; It is characterized in that: comprising: controller, solar cell array, batteries, direct current emergency load, combining inverter, public power distribution network; The input of the output termination controller of solar cell array; Said controller has three tunnel outputs, and its first via output connects the direct current emergency load; Its second tunnel output connects batteries; Its Third Road output connects public power distribution network through combining inverter; Solar photovoltaic grid-connection is characterised in that controller from the net hybrid power system; Comprise: operational mode control unit (201), anti-electric current pour in down a chimney diode D3, MPPT maximum power point tracking device, middle straightening stream bus (202), DC decompression converter, low-voltage direct bus (203), charging-discharging controller, emergent output transfer relay J1; The input of controller pours in down a chimney the input that diode D3 connects the MPPT maximum power point tracking device through anti-electric current; Straightening stream bus (202) in the output termination of said MPPT maximum power point tracking device, said middle straightening stream bus (202) connects the Third Road output of controller; Straightening stream bus (202) also connects low-voltage direct bus (203) through the DC decompression converter in said; Said low-voltage direct bus (203) connects the first via output of controller through the normally opened contact of emergent output transfer relay J1; Said low-voltage direct bus (203) also connects the input of charging-discharging controller; Said charging-discharging controller has two tunnel outputs; Its first via output is exported through the first via that the emergent normally-closed contact of exporting transfer relay J1 connects controller, and its second tunnel output connects the second tunnel output of controller.
2. solar photovoltaic grid-connection as claimed in claim 1 is from the net hybrid power system, and its characteristic also is operational mode control unit (201), comprising: solar cell array voltage sampling circuit, low-voltage direct busbar voltage sample circuit and microcontroller MCU.
3. solar photovoltaic grid-connection as claimed in claim 1 is from the net hybrid power system; Its characteristic also is operational mode control unit (201), when low-voltage direct busbar voltage Vdc_min＜Vdc＜Vdc_max, and the S1 of control unit (201) end output high level; The normally opened contact of emergent output transfer relay J1 is closed; Normally-closed contact breaks off, and the electric energy of emergent output is from the low-voltage direct bus, promptly from the real-time generating of solar cell array; When low-voltage direct busbar voltage Vdc＜Vdc_min or Vdc＞Vdc_max; The S1 end output low level of control unit (201); The normally opened contact of emergent output transfer relay J1 breaks off; Normally-closed contact is closed, and the electric energy of emergent output is from the output of charging-discharging controller, promptly from the energy storage of batteries.
4. solar photovoltaic grid-connection as claimed in claim 1 is from the net hybrid power system, and the rated value of straightening stream bus (202) voltage and the input of combining inverter adapted during its characteristic also was.
5. solar photovoltaic grid-connection as claimed in claim 1 is from the net hybrid power system, and its characteristic is that also the rated value of low-voltage direct busbar voltage (203) and the rated value of direct current emergency load adapt.
6. solar photovoltaic grid-connection as claimed in claim 1 is from the net hybrid power system; Its characteristic also is DC decompression converter using BUCK DC transfer circuit; Ratio according to low-voltage direct bus (203) voltage and middle straightening stream bus (202) voltage rating; Confirm the duty ratio of its switching device, fix all the time that its output input direct voltage no-load voltage ratio also is constant in the duty ratio of said its switching device of DC decompression converter duration of work.
7. solar photovoltaic grid-connection as claimed in claim 1 is from the net hybrid power system; Its characteristic is that also it is main switching device that charging-discharging controller uses power MOSFET; Microcontroller MCU is a control circuit; Control charging peak current breaks off charge circuit and breaks off discharge loop when under-voltage when being full of.
8. solar photovoltaic grid-connection as claimed in claim 1 is from the net hybrid power system; Its characteristic is that also combining inverter uses full-bridge inverter circuit to be main circuit; Digital signal processor DSP is a control circuit; Run duration has the automatic regulatory function of power output, and straightening stream bus (202) voltage is in working range in making.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011201555610U CN202261081U (en) | 2011-05-16 | 2011-05-16 | Solar photovoltaic grid-connected and grid-disconnected hybrid power generating system |
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| CN2011201555610U CN202261081U (en) | 2011-05-16 | 2011-05-16 | Solar photovoltaic grid-connected and grid-disconnected hybrid power generating system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185532A (en) * | 2011-05-16 | 2011-09-14 | 武汉纺织大学 | Grid-connected and off-grid hybrid solar energy photovoltaic generating system |
| CN102723896A (en) * | 2012-06-21 | 2012-10-10 | 上海市电力公司 | Photovoltaic power generation system |
| CN103856150A (en) * | 2014-03-31 | 2014-06-11 | 宋旭 | Independent direct-current photovoltaic power generation system in building |
| CN104868840A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Photovoltaic energy storage inverter off-grid MPPT perturbation method |
| CN108923521A (en) * | 2018-08-23 | 2018-11-30 | 徐州工业职业技术学院 | A kind of solar panel Intelligent charge-discharge control circuit, control method and vehicle |
| CN109698523A (en) * | 2019-03-08 | 2019-04-30 | 四川长虹集能阳光科技有限公司 | Photovoltaic energy storage inversion system |
| TWI700887B (en) * | 2018-12-28 | 2020-08-01 | 映興電子股份有限公司 | Solar power system with low illumination wake-up charging function |
| CN113795400A (en) * | 2019-05-13 | 2021-12-14 | 阿特拉斯科技控股有限公司 | Electric or hybrid vehicle with solar panels |
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- 2011-05-16 CN CN2011201555610U patent/CN202261081U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185532A (en) * | 2011-05-16 | 2011-09-14 | 武汉纺织大学 | Grid-connected and off-grid hybrid solar energy photovoltaic generating system |
| CN102723896A (en) * | 2012-06-21 | 2012-10-10 | 上海市电力公司 | Photovoltaic power generation system |
| CN103856150A (en) * | 2014-03-31 | 2014-06-11 | 宋旭 | Independent direct-current photovoltaic power generation system in building |
| CN104868840A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Photovoltaic energy storage inverter off-grid MPPT perturbation method |
| CN104868840B (en) * | 2015-05-12 | 2016-08-24 | 江苏固德威电源科技股份有限公司 | Photovoltaic energy storage inverter off-network MPPT perturbation motion method |
| CN108923521A (en) * | 2018-08-23 | 2018-11-30 | 徐州工业职业技术学院 | A kind of solar panel Intelligent charge-discharge control circuit, control method and vehicle |
| TWI700887B (en) * | 2018-12-28 | 2020-08-01 | 映興電子股份有限公司 | Solar power system with low illumination wake-up charging function |
| CN109698523A (en) * | 2019-03-08 | 2019-04-30 | 四川长虹集能阳光科技有限公司 | Photovoltaic energy storage inversion system |
| CN113795400A (en) * | 2019-05-13 | 2021-12-14 | 阿特拉斯科技控股有限公司 | Electric or hybrid vehicle with solar panels |
| CN113795400B (en) * | 2019-05-13 | 2024-02-13 | 光年知识产权资本运营私人有限公司 | Electric or hybrid vehicle with solar panels |
| CN114614506A (en) * | 2022-05-12 | 2022-06-10 | 河南豫氢动力有限公司 | Fuel cell cogeneration electrical system |
| CN114614506B (en) * | 2022-05-12 | 2022-12-13 | 河南豫氢动力有限公司 | Fuel cell combined heat and power supply electrical system |
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