CN203434638U - Solar cell grid-connected power generation system - Google Patents
Solar cell grid-connected power generation system Download PDFInfo
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- CN203434638U CN203434638U CN201320485183.1U CN201320485183U CN203434638U CN 203434638 U CN203434638 U CN 203434638U CN 201320485183 U CN201320485183 U CN 201320485183U CN 203434638 U CN203434638 U CN 203434638U
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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 solar cell grid-connected power generation system belonging to the field of solar cell grid-connected technology, wherein a voltage sampling module is used for sampling the output voltage of a solar cell, and the line voltage and the phase voltage of a three-phase power grid respectively. A control module is used for comparing the value of the output voltage of the solar cell with the values of the line voltage and the phase voltage, and then controlling the on/off states of both an inverter module and a relay switch group according to the value relationship. In this way, the DC power supply outputted by the solar cell is subjected to the three-phase/single-phase inversion process and then connected with the power grid. According to the technical scheme of the utility model, firstly, different inversion modes can be carried out correspondingly according to the output voltage of the solar cell, and then the power supply outputted by the solar cell is connected with the power grid. Therefore, the circuit structure is simplified and the line loss is reduced at the same time. Meanwhile, the problem that, an existing solar cell grid-connected system is complex in structure, large in control difficulty and low in efficiency, can also be solved.
Description
Technical field
The utility model belongs to the grid-connected field of solar cell, relates in particular to a kind of solar cell grid-connected system.
Background technology
In solar cell grid-connected system, because solar battery panel is subject to illumination, the impact of temperature etc. can produce unfixed maximum power point, this unfixed maximum power point is corresponding unfixed maximum power point voltage again, so the general needs employing in solar cell grid-connected system can be processed the inverter that voltage range is comparatively broad, just can meet the demands.
And the voltage that will process wide region is inputted, traditional inverter is generally by two-stage or multistage composition, first class boost circuit, one-level inverter circuit, when input voltage is lower, booster circuit is elevated to specific voltage by input voltage, and then by inverter circuit inversion, the shortcomings such as this structure exists progression many, controls complexity, and efficiency is low.
Utility model content
The utility model provides a kind of solar cell grid-connected system, is intended to solve existing solar cell grid-connected system complex structure, controls responsible, inefficient problem.
In order to solve the problems of the technologies described above, the utility model is achieved in that a kind of solar cell grid-connected system, comprise solar cell, described solar cell grid-connected system is connected with three phase network, and described solar cell grid-connected system also comprises:
Be connected the voltage sample module of respectively line voltage and the phase voltage of the output voltage of described solar cell, described three phase network being sampled with described three phase network with described solar cell;
Be connected with described solar cell, the direct current of described solar cell output be converted to the inverter module of alternating current;
Be connected with described three phase network with described inverter module, control the relay switch group that the output current of described inverter module carries out three tunnel conductings or two-way conducting; And
With described voltage sample module, described inverter module and described relay switch group connect, the magnitude relationship of more described output voltage and described line voltage and described phase voltage respectively, when described output voltage is greater than described line voltage, controlling described inverter module carries out three-phase inversion and controls described relay switch Zu San road conducting and export described three-phase alternating current, when described output voltage is less than described line voltage and is greater than described phase voltage, controlling described inverter module carries out single-phase inversion and controls the control module that described single-phase alternating current is exported in the conducting of described relay switch group two-way.
Further, described solar cell grid-connected system also comprises:
Be connected between described inverter module and described relay switch group the filtration module of the interference signal described in filtering in alternating current.
Further, described inverter module is three phase inverter bridge, and the input of described three phase inverter bridge is connected with the output of solar cell, and the output of described three phase inverter bridge is connected with described filtration module.
Further, described filtration module comprises inductance L 1, inductance L 2, inductance L 3;
The first end of the first end of the first end of described inductance L 1, described inductance L 2 and described inductance L 3 is connected with three outputs of described three phase inverter bridge respectively, and the second end of the second end of described inductance L 1, the second end of described inductance L 2 and described inductance L 3 is connected with described relay switch group respectively.
Further, described relay switch group comprises relay switch K1, relay switch K2, relay switch K3, relay switch K4;
The first end of described relay switch K1, the first end of described relay switch K2 first end and described relay switch K3 respectively with the second end of described inductance L 1, the second end of the second end of described inductance L 2 and described inductance L 3 connects, the second end of described relay switch K1, the second end of described relay switch K2 the second end and described relay switch K3 is connected with three live wires of described three phase network respectively, the control end of described relay switch K1, described relay switch K2 control end, the control end of described relay switch K3 is connected with described control module respectively, the first end of described relay switch K4 is connected with described relay switch K2 first end, the second end of described relay switch K4 is connected with the neutral line of described three phase network.
Further, described control module is micro-chip processor U1;
The voltage sample end of described micro-chip processor U1 is connected with described voltage sample module, the Control end of described micro-chip processor U1 is connected with the control end of described relay switch K1, described relay switch K2 control end, the control end of described relay switch K3 and the control end of described relay switch K4 respectively, and the inverter control end of described micro-chip processor U1 is connected with the control end of each switching tube of described three phase inverter bridge respectively.
In the utility model, by the voltage sample module output voltage to solar cell respectively, line voltage and the phase voltage of three phase network are sampled, then by the magnitude relationship of the more described output voltage of control module and described line voltage and described phase voltage, according to the operating state of their magnitude relationship control inverter module and relay switch group, make the direct current of solar cell output carry out being connected to the grid after three-phase or single-phase inversion, the utility model selects different invertings to carry out being connected to the grid after inversion according to the output voltage of solar cell, simplified circuit structure, reduced line loss simultaneously, solved existing solar cell grid-connected system complex structure, control the large and inefficient problem of difficulty.
Accompanying drawing explanation
Fig. 1 is the modular structure figure of the solar cell grid-connected system that provides of the utility model embodiment;
Fig. 2 is the circuit structure diagram of the solar cell grid-connected system that provides of the utility model embodiment;
Fig. 3 is the isoboles that solar cell grid-connected system that the utility model embodiment provides carries out three-phase inversion;
Fig. 4 is the isoboles that solar cell grid-connected system that the utility model embodiment provides carries out single-phase inversion.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Below in conjunction with specific embodiment, specific implementation of the present utility model is described in detail:
Fig. 1 shows the solar cell grid-connected system that the utility model embodiment provides, and for convenience of explanation, the present embodiment is only enumerated the part relevant to the present embodiment.
As shown in Figure 1, the solar cell grid-connected system 100 that the utility model embodiment provides, comprise solar cell BAT, solar cell grid-connected system 100 is connected with three phase network AC1, AC2, AC3, and solar cell grid-connected system 100 also comprises:
Be connected with three phase network AC1, AC2, AC3 with solar cell BAT, respectively to the output voltage V 0 of solar cell BAT and three phase network AC1, AC2, the line voltage V1 of AC3 and the voltage sample module 101 that phase voltage V2 samples respectively;
BAT is connected with solar cell, the direct current of solar cell BAT output is converted to the inverter module 102 of alternating current;
Be connected with three phase network AC1, AC2, AC3 with inverter module 102, the output current of control inverter module 102 carries out the relay switch group 103 of three tunnel conductings or two-way conducting; And
With voltage sample module 101, inverter module 102 and relay switch group 103 connect, compare respectively the output voltage V 0 of solar cell BAT and the magnitude relationship of line voltage V1 and phase voltage V2, when this output voltage V 0 is greater than line voltage V1, control inverter module 102 is carried out three-phase inversion control relay switches set 103San road conducting output three-phase alternating current, when output voltage V 0 is less than line voltage V1 and is greater than phase voltage V2, control inverter module 102 is carried out the control module 104 of single-phase inversion control relay switches set 103 two-way conducting output single-phase alternating currents.
In the utility model embodiment, three phase network adopts star-like connected mode to connect, voltage sample module 101 is accurate real-time voltage sampling A/D chip, can Real-time Obtaining the not output voltage V 0 of solar cell BAT and the line voltage V1 of three phase network and phase voltage V2 in the same time, the utility model embodiment is by comparing the magnitude relationship of output voltage V 0 and line voltage V1 and phase voltage V2, then according to the operating state of comparative result control inverter module 102 and relay switch group 103, inverter module 102 comprises three-phase inversion and two kinds of operating states of single-phase inversion, relay switch group 103 comprises three tunnel conductings and two kinds of operating states of two-way conducting, relay switch group 103Wei tri-tunnel conductings when inverter module 102 carries out three-phase inversion, when inverter module 102 carries out single-phase inversion, relay switch group 103 is two-way conducting.
As the utility model one embodiment, solar cell grid-connected system also comprises:
Be connected between inverter module 102 and relay switch group 103 filtration module 104 of the interference signal in filtering alternating current;
Be connected with control module 104, show the output voltage V 0 of solar cell BAT and the display module 106 of the line voltage V1 of three phase network and the on off state of phase voltage V2 and relay switch group 103.
In the utility model embodiment, display module 106 is for showing the output voltage V 0 of solar cell BAT, the line voltage V1 of three phase network and phase voltage V2, and the on off state of relay switch group 103, be convenient to like this staff the service data of solar cell grid-connected system is controlled.
As shown in Figure 2, as the utility model one embodiment, inverter module 102 is three phase inverter bridge M, and the input of three phase inverter bridge M is connected with the output of solar cell BAT, and the output of three phase inverter bridge M is connected with filtration module 105 respectively.
In the utility model embodiment, three phase inverter bridge M is the three-phase inverter topology of two level three-phase inverters or three level three-phase inverters or other form.
As the utility model one embodiment, filtration module 105 comprises inductance L 1, inductance L 2, inductance L 3;
The first end of the first end of the first end of inductance L 1, inductance L 2 and inductance L 3 is connected with three outputs of three phase inverter bridge M respectively, and the second end of the second end of inductance L 1, the second end of inductance L 2 and inductance L 3 is connected with relay switch group 103 respectively.
In the utility model embodiment, three phase inverter bridge M has three inverter current outputs, is connected respectively with inductance L 1, inductance L 2 and inductance L 3.
As the utility model one embodiment, relay switch group 103 comprises relay switch K1, relay switch K2, relay switch K3, relay switch K4;
The first end of relay switch K1, the first end of relay switch K2 first end and relay switch K3 respectively with the second end of inductance L 1, the second end of the second end of inductance L 2 and inductance L 3 connects, the second end of relay switch K1, relay switch K2 the second end, the second end of relay switch K3 respectively with three live wire (AC1 of three phase network, AC2, the input of AC3) connect, the control end of relay switch K1, relay switch K2 control end, the control end of relay switch K3 is connected with control module 104 respectively, the first end of relay switch K4 is connected with relay switch K2 first end, the second end of relay switch K4 is connected with the neutral line (zero line) of three phase network.
As the utility model one embodiment, control module 104 is micro-chip processor U1;
The voltage sample end IN1 of micro-chip processor U1 is connected with voltage sample module 101, the Control end I/O1-I/O4 of micro-chip processor U1 is connected with control end, relay switch K2 control end, the control end of relay switch K3, the control end of relay switch K4 of relay switch K1 respectively, the inverter control end I/O5-I/O10 of micro-chip processor U1 is connected with the control end of each switching tube of three phase inverter bridge M respectively, and the demonstration output OUT1 end of micro-chip processor U1 is connected with display module 106.
Fig. 3 shows in the utility model embodiment, when the output voltage V 0 of solar cell BAT is greater than the line voltage V1 of three phase network, control module 104 is controlled the equivalent electric circuit that three phase inverter bridge M carries out three-phase inversion, relay switch Zu San road conducting (relay switch K1-K3 conducting, relay switch K4 disconnect), for convenience of explanation, Fig. 3 is the equivalent circuit diagram that three phase inverter bridge M carries out being incorporated to after three-phase inversion three phase network.
Fig. 4 shows in the utility model embodiment, when the output voltage V 0 of solar cell BAT is less than the line V1 of three-phase voltage and is greater than phase voltage V2, control module 104 is controlled three-phase inverter M and is carried out single-phase inversion, the 103 two-way conductings of relay switch group (relay switch K1 and K4 conducting, relay switch K3 disconnection) equivalent electric circuit, the control mode of relay switch group 103 two-way conductings also comprises relay switch K3 and K4 conducting, and relay switch K1 disconnects this kind of control mode.
In the utility model embodiment, when control module 104 control three phase inverter bridge M carry out single-phase inversion, there are two kinds of control modes, the first is the switching tube S1 controlling in three phase inverter bridge M, S2, S3, S4 work, switching tube S5, S6 does not work, corresponding control relay K switch 1 and K4 conducting, relay switch K3 disconnects, the second is the switching tube S3 controlling in three phase inverter bridge M, S4, S5, S6 work, switching tube S1, S2 does not work, corresponding control relay K switch 3 and K4 conducting, relay switch K1 disconnects, what Fig. 4 adopted is the first control mode.
The operation principle of the solar cell grid-connected system below the utility model embodiment being provided describes.
By voltage sample module 101 real-time samplings, obtain not the output voltage V 0 of solar cell BAT and the line voltage V1 of three phase network and phase voltage V2 in the same time, then by control module 104, compare the magnitude relationship of output voltage V 0 and line voltage V1 and phase voltage V2, then according to comparative result control inverter module 102(three-phase inverter M) and the operating state of relay switch group 103, when output voltage V 0 is greater than the line voltage V1 of three phase network, control module 104 is controlled three phase inverter bridge M and is carried out three-phase inversion, control relay switches set module 103San road conducting (relay switch K1-K3 conducting simultaneously, relay switch K4 disconnection) three-phase alternating current after output three phase inverter bridge M inversion, when output voltage V 0 is less than the line voltage V1 of three phase network and is greater than the phase voltage V2 of three-phase voltage, control module 104 is controlled three phase inverter bridge M and is carried out single-phase inversion, control relay switches set 103 two-way conductings simultaneously (relay switch K1 and K4 conducting, relay switch K3 disconnects or relay switch K3 and K4 conducting, relay switch K1 disconnection) single-phase alternating current of output three phase inverter bridge M output is connected to the grid.
In the utility model embodiment, by the voltage sample module output voltage to solar cell respectively, line voltage and the phase voltage of three phase network are sampled, then by the magnitude relationship of the more described output voltage of control module and described line voltage and described phase voltage, according to the operating state of their magnitude relationship control inverter module and relay switch group, make the direct current of solar cell output carry out being connected to the grid after three-phase or single-phase inversion, the utility model selects different invertings to carry out being connected to the grid after inversion according to the output voltage of solar cell, simplified circuit structure, reduced line loss simultaneously, solved existing solar cell grid-connected system complex structure, control the large and inefficient problem of difficulty.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (6)
1. a solar cell grid-connected system, comprises solar cell, and described solar cell grid-connected system is connected with three phase network, it is characterized in that, described solar cell grid-connected system also comprises:
Be connected the voltage sample module of respectively line voltage and the phase voltage of the output voltage of described solar cell, described three phase network being sampled with described three phase network with described solar cell;
Be connected with described solar cell, the direct current of described solar cell output be converted to the inverter module of alternating current;
Be connected with described three phase network with described inverter module, control the relay switch group that the output current of described inverter module carries out three tunnel conductings or two-way conducting; And
With described voltage sample module, described inverter module and described relay switch group connect, the magnitude relationship of more described output voltage and described line voltage and described phase voltage respectively, when described output voltage is greater than described line voltage, controlling described inverter module carries out three-phase inversion and controls described relay switch Zu San road conducting and export described three-phase alternating current, when described output voltage is less than described line voltage and is greater than described phase voltage, controlling described inverter module carries out single-phase inversion and controls the control module that described single-phase alternating current is exported in the conducting of described relay switch group two-way.
2. solar cell grid-connected system as claimed in claim 1, is characterized in that, described solar cell grid-connected system also comprises:
Be connected between described inverter module and described relay switch group the filtration module of the interference signal described in filtering in alternating current.
3. solar cell grid-connected system as claimed in claim 2, it is characterized in that, described inverter module is three phase inverter bridge, and the input of described three phase inverter bridge is connected with the output of solar cell, and the output of described three phase inverter bridge is connected with described filtration module.
4. solar cell grid-connected system as claimed in claim 3, is characterized in that, described filtration module comprises inductance L 1, inductance L 2, inductance L 3;
The first end of the first end of the first end of described inductance L 1, described inductance L 2 and described inductance L 3 is connected with three outputs of described three phase inverter bridge respectively, and the second end of the second end of described inductance L 1, the second end of described inductance L 2 and described inductance L 3 is connected with described relay switch group respectively.
5. solar cell grid-connected system as claimed in claim 4, is characterized in that, described relay switch group comprises relay switch K1, relay switch K2, relay switch K3, relay switch K4;
The first end of described relay switch K1, the first end of described relay switch K2 first end and described relay switch K3 respectively with the second end of described inductance L 1, the second end of the second end of described inductance L 2 and described inductance L 3 connects, the second end of described relay switch K1, the second end of described relay switch K2 the second end and described relay switch K3 is connected with three live wires of described three phase network respectively, the control end of described relay switch K1, described relay switch K2 control end, the control end of described relay switch K3 is connected with described control module respectively, the first end of described relay switch K4 is connected with described relay switch K2 first end, the second end of described relay switch K4 is connected with the neutral line of described three phase network.
6. solar cell grid-connected system as claimed in claim 5, is characterized in that, described control module is micro-chip processor U1;
The voltage sample end of described micro-chip processor U1 is connected with described voltage sample module, the Control end of described micro-chip processor U1 is connected with the control end of described relay switch K1, described relay switch K2 control end, the control end of described relay switch K3 and the control end of described relay switch K4 respectively, and the inverter control end of described micro-chip processor U1 is connected with the control end of each switching tube of described three phase inverter bridge respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320485183.1U CN203434638U (en) | 2013-08-09 | 2013-08-09 | Solar cell grid-connected power generation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320485183.1U CN203434638U (en) | 2013-08-09 | 2013-08-09 | Solar cell grid-connected power generation system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348185A (en) * | 2013-08-09 | 2015-02-11 | 深圳古瑞瓦特新能源股份有限公司 | Solar battery grid-connected power generating system and method |
| CN109557491A (en) * | 2018-12-17 | 2019-04-02 | 江苏固德威电源科技股份有限公司 | A kind of its inverter of three-phase voltage sampling correcting methods and applications |
| CN111030279A (en) * | 2019-12-31 | 2020-04-17 | 深圳供电局有限公司 | Automatic control method of solar cell |
-
2013
- 2013-08-09 CN CN201320485183.1U patent/CN203434638U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348185A (en) * | 2013-08-09 | 2015-02-11 | 深圳古瑞瓦特新能源股份有限公司 | Solar battery grid-connected power generating system and method |
| CN104348185B (en) * | 2013-08-09 | 2017-04-26 | 深圳古瑞瓦特新能源股份有限公司 | Solar battery grid-connected power generating system and method |
| CN109557491A (en) * | 2018-12-17 | 2019-04-02 | 江苏固德威电源科技股份有限公司 | A kind of its inverter of three-phase voltage sampling correcting methods and applications |
| CN111030279A (en) * | 2019-12-31 | 2020-04-17 | 深圳供电局有限公司 | Automatic control method of solar cell |
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Effective date of registration: 20210202 Address after: 518101 2 / F and 3 / F, building 4, xibianling Jiayu Company Industrial Zone, Shangwu village, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN GROWATT NEW ENERGY Co.,Ltd. Address before: 518000 East and third floors, 1st floor, building 5, xibianling Jiayu Company Industrial Zone, Shangwu village, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN GROWATT NEW ENERGY TECHNOLOGY Co.,Ltd. |
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| CP03 | Change of name, title or address |
Address after: 518101 floor a401, 4-13, building a, Sino German European Industrial Demonstration Park, Hangcheng Avenue, guxing community, Xixiang street, Bao'an District, Shenzhen, Guangdong Patentee after: Shenzhen Growatt New Energy Technology Co.,Ltd. Address before: 518101 2 / F and 3 / F, building 4, xibianling Jiayu Company Industrial Zone, Shangwu village, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN GROWATT NEW ENERGY Co.,Ltd. |
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Granted publication date: 20140212 |
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