CN204119150U - A kind of photovoltaic generating system of high-efficiency and low-cost - Google Patents
A kind of photovoltaic generating system of high-efficiency and low-cost Download PDFInfo
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- CN204119150U CN204119150U CN201420427206.8U CN201420427206U CN204119150U CN 204119150 U CN204119150 U CN 204119150U CN 201420427206 U CN201420427206 U CN 201420427206U CN 204119150 U CN204119150 U CN 204119150U
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- generating system
- photovoltaic generating
- mppt converter
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- 230000005669 field effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
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Abstract
The utility model provides a kind of photovoltaic generating system of high-efficiency and low-cost, comprising: MPPT converter, inverter, transformer and at least two group strings parallel with one another; One or more groups of series windings are connected to a corresponding MPPT converter, and described group of series winding is connected to the input of MPPT converter, and the output of described MPPT converter is connected to the input of inverter, and the output of described inverter is connected with transformer.The utility model can raise the DC bus-bar voltage of photovoltaic generating system, then the power density of inverter can double, and namely cost can reduce half at most; In addition, because two of prior art inverters unite two into one by the utility model, eliminate two buses, three inverters to the cable of transformer, megawatt room volume is less, more cheap two winding transformer can be adopted, significantly can reduce the electric equipment cost of photovoltaic generating system, and the energy output of whole system can be promoted 3 ~ 5%.
Description
Technical field
The utility model relates to a kind of photovoltaic generating system, particularly relates to a kind of photovoltaic generating system of high-efficiency and low-cost.
Background technology
The photovoltaic generating system of solar energy obtains large-scale application, and large-scale photovoltaic plant adopts centralized photovoltaic generating system usually, and this photovoltaic generating system is normally by two 500kW inverter parallels, and the two transformer with split windings then meeting a 1MW network; With inverter be connected group string cell panel all and together with, then through header box and power distribution cabinet, finally access inverter.
There is following shortcoming in this existing photovoltaic generating system: on the one hand all groups of strings all and together, under the same voltage that works, therefore system can not make each group of string be operated in maximum power point, thus cause the energy output reducing group string; On the other hand because the opening voltage of photovoltaic generating system DC side is less than 1000V, maximum power point voltage work is limited in 450 ~ 650V, therefore inverter output voltage is limited in 315Vac, the maximum input current of 500kW inverter is 1100A, if increase inverter output power further, then input current of inverter increases further, and certainly will adopt semiconductor power device and the switching device of more high current capacity, system cost sharply rises.
In prior art, property difference, pollution level and the degree of aging of going here and there due to group are inconsistent, and the maximum power point of each group of string all likely there are differences.As shown in Figure 2, the voltage corresponding to maximum power point of first group of string exists
, the voltage corresponding to the maximum power point of second group of string exists
, the voltage corresponding to maximum power point of the 3rd group of string exists
; When all group strings are all connected in parallel, the operating voltage of each group of string is consistent, as system busbar voltage power supply exists
time, then second group of string reaches maximum power point, and first group of string and the 3rd group of string all do not reach maximum power point, and the energy output of whole photovoltaic generating system will be caused like this to reduce.
MPPT converter described in this example is realized by MPPT circuit, and first each group string accesses to MPPT converter, the output-parallel of MPPT converter together after access to inverter again; The maximum power point being found each group string by hardware circuit is responsible on the one hand by described MPPT converter, and each group string is all operated under maximum power point; The high pressure of stable output on the other hand, improves busbar voltage.Such as busbar voltage is promoted to 900Vdc, then inverter output voltage can reach 630Vac, then, under identical input current 1100A, the power that inverter exports can reach 1000kW; And the power device of inverter is all the specifications design according to 1000V, during inverter input 900V, because maximum input current is still 1100A, export maximum current also not change, therefore, most of power device of this example can not do any change, and power density can double, and namely cost can reduce half at most.
In prior art, as shown in Figure 3, photovoltaic generating system is normally by two 500kW inverter parallels, and the two transformer with split windings then meeting a 1MW network; With inverter be connected group string cell panel all and together with, then through header box and power distribution cabinet, finally access inverter.There is following shortcoming in this existing photovoltaic generating system: on the one hand all groups of strings all and together, under the same voltage that works, therefore system can not make each group of string be operated in maximum power point, thus cause the energy output reducing group string; On the other hand because the opening voltage of photovoltaic generating system DC side is less than 1000V, maximum power point voltage work is limited in 450 ~ 650V, therefore inverter output voltage is limited in 315Vac, the maximum input current of 500kW inverter is 1100A, if increase inverter output power further, then input current of inverter increases further, and certainly will adopt semiconductor power device and the switching device of more high current capacity, system cost sharply rises.
Two of prior art inverters unite two into one by this example, and eliminate two buses, three inverters to the cable of transformer, megawatt room volume is less, and can adopt more cheap two winding transformer; And the internal circuit of the MPPT converter introduced, adopt high frequency means, efficiency can reach 99%, its total cost is only 1/3rd of single inverter cost, therefore, this example significantly can reduce the electric equipment cost of photovoltaic generating system, and the energy output of whole system can be promoted 3 ~ 5%.
As shown in Figure 1, an input of this routine described MPPT converter is connected to the positive pole of group string, and another input of described MPPT converter is connected to the negative pole of group string; Be connected to bus positive pole after an output of described MPPT converter is parallel with one another, after another output of described MPPT converter is parallel with one another, be connected to bus negative pole; Busbar voltage receives inverter, and inverter exports and receives transformer.
This routine described transformer can be adopted as two winding transformer.
The technical term of this example is explained as follows: MPPT is MPPT maximum power point tracking; In large-sized photovoltaic power station, be unit usually with 1MW, independent grid-connected, megawatt room is in 1MW photovoltaic system installs inverter, power distribution cabinet, communication counter, the civil engineering room of watch-dog or container, and its power output is 1MW; Two transformer with split winding: former limit is two independent winding, and secondary is the transformer of a winding; Two winding transformer: former secondary all only has the transformer of a winding.
Summary of the invention
Technical problem to be solved in the utility model needs to provide a kind of low cost and high efficiency photovoltaic generating system.
To this, the utility model provides a kind of photovoltaic generating system of high-efficiency and low-cost, comprising: MPPT converter, inverter, transformer and at least two group strings parallel with one another; One or more groups of series windings are connected to a corresponding MPPT converter, and described group of series winding is connected to the input of MPPT converter, and the output of described MPPT converter is connected to the input of inverter, and the output of described inverter is connected with transformer.
MPPT converter described in the utility model is realized by MPPT circuit, and first each group string accesses to MPPT converter, the output-parallel of MPPT converter together after access to inverter again; The maximum power point being found each group string by hardware circuit is responsible on the one hand by described MPPT converter, and the high pressure of stable output on the other hand, improves busbar voltage.Such as busbar voltage is promoted to 900Vdc, then inverter output voltage can reach 630Vac, then, under identical input current 1100A, the power that inverter exports can reach 1000kW; And the power device of inverter is all the specifications design according to 1000V, during inverter input 900V, because maximum input current is still 1100A, export maximum current also not change, therefore, most of power device of the present utility model can not do any change, and power density can double, and namely cost can reduce half at most.
In addition, because two of prior art inverters unite two into one by the utility model, eliminate two buses, three inverters to the cable of transformer, megawatt room volume is less, and can adopt more cheap two winding transformer; And the internal circuit of the MPPT converter introduced, adopt high frequency means, efficiency can reach 99%, its total cost is only 1/3rd of single inverter cost, therefore, the utility model significantly can reduce the electric equipment cost of photovoltaic generating system, and the energy output of whole system can be promoted 3 ~ 5%.
Further improvement of the utility model is, an input of described MPPT converter is connected to the positive pole of group string, and another input of described MPPT converter is connected to the negative pole of group string.
Further improvement of the utility model is, described MPPT converter and each organize string and connect one to one, parallel with one another between at least two MPPT converters.
Further improvement of the utility model is, is connected to bus positive pole after an output of described MPPT converter is parallel with one another, is connected to bus negative pole after another output of described MPPT converter is parallel with one another.
Further improvement of the utility model is, described transformer is two winding transformer.
Further improvement of the utility model is, described MPPT converter comprises controller and booster circuit, and described controller is for closing ring controller.
Further improvement of the utility model is, described booster circuit comprises electric capacity Cin, electric capacity C0, diode D and switching tube Q; Described electric capacity Cin is connected with input both positive and negative polarity; Described inductance L one end is connected with electric capacity Cin, and the other end is connected with the anode of diode D; The anode of described diode D is connected with switching tube Q and inductance L respectively, and the negative electrode of described diode D is connected with output head anode; Described switching tube Q one end is connected with the anode of diode D, and the other end is connected with circuit negative pole; Described electric capacity C0 is connected with output positive and negative charge.
Further improvement of the utility model is, described controller is connected with output with the input of booster circuit respectively, and described controller is connected with the G level of IGBT field effect transistor.
Compared with prior art, the beneficial effects of the utility model are: most of power device of photovoltaic generating system can not do any change, but power density can double, and namely cost can reduce half at most; In addition, because two of prior art inverters unite two into one by the utility model, eliminate two buses, three inverters to the cable of transformer, megawatt room volume is less, can adopt more cheap two winding transformer; And the internal circuit of the MPPT converter introduced, adopt high frequency means, efficiency can reach 99%, its total cost is only 1/3rd of single inverter cost, therefore, the utility model significantly can reduce the electric equipment cost of photovoltaic generating system, and the energy output of whole system can be promoted 3 ~ 5%.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of embodiment of the utility model;
Fig. 2 is the power of of the present utility model group of string and the relation schematic diagram of operating voltage;
Fig. 3 is the structural representation of prior art;
Fig. 4 is the electrical block diagram of the MPPT converter of the another kind of embodiment of the utility model.
Embodiment
Below in conjunction with accompanying drawing, preferably embodiment of the present utility model is described in further detail.
Embodiment 1:
As shown in Figure 1, this example provides a kind of photovoltaic generating system of high-efficiency and low-cost, comprising: MPPT converter, inverter, transformer and at least two group strings parallel with one another; One or more groups of series windings are connected to a corresponding MPPT converter, and described group of series winding is connected to the input of MPPT converter, and the output of described MPPT converter is connected to the input of inverter, and the output of described inverter is connected with transformer.
Embodiment 2:
On the basis of embodiment 1, as shown in Figure 4, this routine described MPPT converter comprises controller and booster circuit, and described controller is for closing ring controller.The described ring controller that closes is preferably phase place and closes ring controller.
This routine described booster circuit comprises electric capacity Cin, electric capacity C0, diode D and switching tube Q; Described electric capacity Cin is connected with input both positive and negative polarity; Described inductance L one end is connected with electric capacity Cin, and the other end is connected with the anode of diode D; The anode of described diode D is connected with switching tube Q and inductance L respectively, and the negative electrode of described diode D is connected with output head anode; Described switching tube Q one end is connected with the anode of diode D, and the other end is connected with circuit negative pole; Described electric capacity C0 is connected with output positive and negative charge.
This routine described controller is connected with output with the input of booster circuit respectively, and described controller is connected with the G level of IGBT field effect transistor.Described controller sends the G level of drive singal to IGBT field effect transistor, and described controller is connected to the input of booster circuit with Gather and input voltage, and described controller is connected to the output of booster circuit to gather output voltage and output current.
The embodiment of the above is better embodiment of the present utility model; not limit concrete practical range of the present utility model with this; scope of the present utility model comprises and is not limited to this embodiment, and the equivalence change that all shapes according to the utility model, structure are done is all in protection range of the present utility model.
Claims (8)
1. a photovoltaic generating system for high-efficiency and low-cost, is characterized in that, comprising: MPPT converter, inverter, transformer and at least two group strings parallel with one another; One or more groups of series windings are connected to a corresponding MPPT converter, and described group of series winding is connected to the input of MPPT converter, and the output of described MPPT converter is connected to the input of inverter, and the output of described inverter is connected with transformer.
2. the photovoltaic generating system of high-efficiency and low-cost according to claim 1, is characterized in that, an input of described MPPT converter is connected to the positive pole of group string, and another input of described MPPT converter is connected to the negative pole of group string.
3. the photovoltaic generating system of high-efficiency and low-cost according to claim 1, is characterized in that, described MPPT converter and each organize string and connect one to one, parallel with one another between at least two MPPT converters.
4. the photovoltaic generating system of high-efficiency and low-cost according to claim 3, it is characterized in that, be connected to bus positive pole after an output of described MPPT converter is parallel with one another, after another output of described MPPT converter is parallel with one another, be connected to bus negative pole.
5. the photovoltaic generating system of the high-efficiency and low-cost according to Claims 1-4 any one, is characterized in that, described transformer is two winding transformer.
6. the photovoltaic generating system of the high-efficiency and low-cost according to Claims 1-4 any one, is characterized in that, described MPPT converter comprises controller and booster circuit, and described controller is for closing ring controller.
7. the photovoltaic generating system of high-efficiency and low-cost according to claim 6, is characterized in that, described booster circuit comprises electric capacity Cin, electric capacity C0, diode D, inductance L and switching tube Q; Described electric capacity Cin is connected with input both positive and negative polarity; Described inductance L one end is connected with electric capacity Cin, and the other end is connected with the anode of diode D; The anode of described diode D is connected with switching tube Q and inductance L respectively, and the negative electrode of described diode D is connected with output head anode; Described switching tube Q one end is connected with the anode of diode D, and the other end is connected with circuit negative pole; Described electric capacity C0 is connected with output positive and negative charge.
8. the photovoltaic generating system of high-efficiency and low-cost according to claim 7, is characterized in that, described controller is connected with output with the input of booster circuit respectively, and described controller is connected with the G level of IGBT field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420427206.8U CN204119150U (en) | 2014-07-30 | 2014-07-30 | A kind of photovoltaic generating system of high-efficiency and low-cost |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420427206.8U CN204119150U (en) | 2014-07-30 | 2014-07-30 | A kind of photovoltaic generating system of high-efficiency and low-cost |
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| CN204119150U true CN204119150U (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420427206.8U Expired - Lifetime CN204119150U (en) | 2014-07-30 | 2014-07-30 | A kind of photovoltaic generating system of high-efficiency and low-cost |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953945A (en) * | 2015-07-01 | 2015-09-30 | 中民新能投资有限公司 | High-efficiency photovoltaic power generation system and method |
| CN110729714A (en) * | 2019-10-30 | 2020-01-24 | 上能电气股份有限公司 | Photovoltaic power generation system input reverse connection protection circuit |
| CN110798246A (en) * | 2019-09-29 | 2020-02-14 | 华为技术有限公司 | Interface circuit, group string and system applied to power line communication |
| CN113422574A (en) * | 2021-05-31 | 2021-09-21 | 华为技术有限公司 | Photovoltaic module and photovoltaic system |
| CN113890003A (en) * | 2021-09-08 | 2022-01-04 | 华为数字能源技术有限公司 | Power generation system |
-
2014
- 2014-07-30 CN CN201420427206.8U patent/CN204119150U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953945A (en) * | 2015-07-01 | 2015-09-30 | 中民新能投资有限公司 | High-efficiency photovoltaic power generation system and method |
| CN104953945B (en) * | 2015-07-01 | 2016-08-17 | 中民新能投资有限公司 | High efficiency photovoltaic generating system and electricity-generating method |
| CN110798246A (en) * | 2019-09-29 | 2020-02-14 | 华为技术有限公司 | Interface circuit, group string and system applied to power line communication |
| CN110798246B (en) * | 2019-09-29 | 2022-02-25 | 华为数字能源技术有限公司 | Interface circuit, group string and system applied to power line communication |
| CN110729714A (en) * | 2019-10-30 | 2020-01-24 | 上能电气股份有限公司 | Photovoltaic power generation system input reverse connection protection circuit |
| CN110729714B (en) * | 2019-10-30 | 2023-07-14 | 上能电气股份有限公司 | Input reverse connection protection circuit of photovoltaic power generation system |
| CN113422574A (en) * | 2021-05-31 | 2021-09-21 | 华为技术有限公司 | Photovoltaic module and photovoltaic system |
| CN113422574B (en) * | 2021-05-31 | 2022-12-02 | 华为数字能源技术有限公司 | Photovoltaic module and photovoltaic system |
| US11824493B2 (en) | 2021-05-31 | 2023-11-21 | Huawei Digital Power Technologies Co., Ltd. | Photovoltaic module and photovoltaic system |
| CN113890003A (en) * | 2021-09-08 | 2022-01-04 | 华为数字能源技术有限公司 | Power generation system |
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Effective date of registration: 20221108 Address after: Floor 9, Keshida Industrial Park R&D Building, No.7 Road, Gaoxinyuan West District, Guangming New District, Shenzhen, Guangdong 518000 Patentee after: SHENZHEN KSTAR NEW ENERGY Co.,Ltd. Address before: Floor 4, Building 1, Software Park, High tech Middle Second Road, Nanshan District, Shenzhen, Guangdong 518057 Patentee before: SHENZHEN KSTAR SCIENCE AND TECHNOLOGY Co.,Ltd. |
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