CN204168233U - Many groups optical crosstalk volt fault of converter testing circuit - Google Patents
Many groups optical crosstalk volt fault of converter testing circuit Download PDFInfo
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- CN204168233U CN204168233U CN201420649764.9U CN201420649764U CN204168233U CN 204168233 U CN204168233 U CN 204168233U CN 201420649764 U CN201420649764 U CN 201420649764U CN 204168233 U CN204168233 U CN 204168233U
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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
Abstract
The utility model relates to photovoltaic DC-to-AC converter technical field, and be specifically related to a kind of many group optical crosstalk volt fault of converter testing circuits, the negative input end of several photovoltaic substrate group strings is connected in parallel; Positive input terminal is connected in parallel after being connected with an a current sensor CS and controllable switch S W respectively again, then an input of voltage sampling circuit is connected, another input of voltage sampling circuit connects the negative input end of photovoltaic substrate group string, be connected a boost circuit between the output of voltage sampling circuit and the input of inverter, the output of inverter connects electrical network.The utility model can detect that whether each photovoltaic substrate group string is normal, the group string object broken down, and shows failure cause by inverter LCD, can also provide solution, bring great convenience to the installation of photovoltaic DC-to-AC converter and use.
Description
Technical field
The utility model relates to photovoltaic DC-to-AC converter technical field, particularly relates to a kind of many group optical crosstalk volt fault of converter testing circuits.
Background technology
Photovoltaic combining inverter is divided into isolated form and non-isolation type usually, because non-isolation type efficiency is high, is the mainstream model on market.For expanding input voltage range, non-isolated combining inverter adopts two-stage topologies usually, and namely prime boost adds rear class inverter circuit.In middle low power photovoltaic DC-to-AC converter, every road boost adopts the connection in series-parallel of many groups together usually, after a boost processing of circuit, deliver to bus.The connection in series-parallel of many groups requires that each group of string uses photovoltaic substrate model, quantity must completely always, the environment installed also needs unanimously, because photovoltaic generation is also in the immature phase at home, the quality of installation personnel is also uneven, though have specific requirement at instruction for mounting to photovoltaic many groups string, what in Practical Project, often find many group connection in series-parallel substrates is provided with many undesirable places.Because present photovoltaic DC-to-AC converter does not judge also whether joint group string has the function of requirement, because the undesirable event causing inverter to run well of photovoltaic substrate of installing happens occasionally, when there is this phenomenon, inverter can not show the true cause of fault, and photovoltaic DC-to-AC converter has problem often to make client think.
Summary of the invention
The utility model, for solving the problem, provides a kind of many group optical crosstalk volt fault of converter testing circuits, can detect that whether each group of string be normal, the group string object broken down, and show failure cause by inverter LCD, easy to install and use.
For achieving the above object, the technical scheme that the utility model adopts is:
A kind of many group optical crosstalk volt fault of converter testing circuits, the negative input end of several photovoltaic substrate group strings is connected in parallel; Positive input terminal is connected in parallel after being connected with an a current sensor CS and controllable switch S W respectively again, then an input of voltage sampling circuit is connected, the negative input end of photovoltaic substrate group string connects another input of voltage sampling circuit, be connected a boost circuit between the output of voltage sampling circuit and the input of inverter, the output of inverter connects electrical network.
Preferably, described photovoltaic substrate group string quantity is at least three, and the negative input end of photovoltaic substrate group string 1, photovoltaic substrate group string 2, photovoltaic substrate group string 3 is connected in parallel, the positive input terminal of photovoltaic substrate group string 1 is connected with the input of the first current sensor CS1, the output of the first current sensor CS1 connects the input of the first controllable switch S W1, the positive input terminal of photovoltaic substrate group string 2 is connected with the input of the second current sensor CS2, the output of the second current sensor CS2 connects the input of the second controllable switch S W2, the positive input terminal of photovoltaic substrate group string 3 is connected with the input of the 3rd current sensor CS3, the output of the 3rd current sensor CS3 connects the input of the 3rd controllable switch S W3, first controllable switch S W1, second controllable switch S W2, the output of the 3rd controllable switch S W3 is connected in parallel, the output of the first controllable switch S W1 connects an input of voltage sampling circuit, and another input of voltage sampling circuit connects the negative input end of photovoltaic substrate group string 3.
Preferably, described boost circuit comprises inductance L 1, the 4th controllable switch S W4, diode D1 and bus capacitor C1, the input of described inductance L 1 is connected with an output of voltage sampling circuit, the output of inductance L 1 is connected with the 4th controllable switch S W4 and diode D1 respectively, 4th controllable switch S W4 connects another output of voltage sampling circuit and the negative pole of bus capacitor C1, diode D1 connection bus electric capacity C1 positive pole, bus capacitor C1 two ends are connected with the input of inverter respectively.
Many group optical crosstalk volt fault of converter testing circuits described in the utility model, its beneficial effect is:
A kind of many group string photovoltaic substrate failure detector circuits are proposed, by detecting the voltage and current of each group string under different conditions, and judged whether to break down by the control module of inverter, each group of string can be easily detected thus whether normal, as broken down, can also judge it is which group string breaks down, and by inverter LCD by corresponding information notification operating personnel, and informing corresponding solution, handled easily personnel use with installation and user.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model many groups optical crosstalk volt fault of converter testing circuit.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
Embodiment:
With reference to Fig. 1, many group optical crosstalk volt fault of converter testing circuits described in the utility model, it comprises several photovoltaic substrate group strings, the negative input end of each photovoltaic substrate group string is connected in parallel, positive input terminal is connected in parallel after connecting an a current sensor CS and controllable switch S W respectively again, then an input of voltage sampling circuit is connected, the negative input end of photovoltaic substrate group string connects another input of voltage sampling circuit, be connected a boost circuit between the output of voltage sampling circuit and the input of inverter, the output of inverter connects electrical network.
Wherein the quantity of photovoltaic substrate group string is at least three, below for three, illustrates this technical scheme:
The negative input end of photovoltaic substrate group string 1, photovoltaic substrate group string 2, photovoltaic substrate group string 3 is connected in parallel, the positive input terminal of photovoltaic substrate group string 1 is connected with the input of the first current sensor CS1, the output of the first current sensor CS1 connects the input of the first controllable switch S W1, the positive input terminal of photovoltaic substrate group string 2 is connected with the input of the second current sensor CS2, the output of the second current sensor CS2 connects the input of the second controllable switch S W2, the positive input terminal of photovoltaic substrate group string 3 is connected with the input of the 3rd current sensor CS3, the output of the 3rd current sensor CS3 connects the input of the 3rd controllable switch S W3, first controllable switch S W1, second controllable switch S W2, the output of the 3rd controllable switch S W3 is connected in parallel, the output of the first controllable switch S W1 connects an input of voltage sampling circuit, and another input of voltage sampling circuit connects the negative input end of photovoltaic substrate group string 3.Boost circuit comprises inductance L 1, the 4th controllable switch S W4, diode D1 and bus capacitor C1, the input of inductance L 1 is connected with an output of voltage sampling circuit, the output of inductance L 1 is connected with the 4th controllable switch S W4 and diode D1 respectively, 4th controllable switch S W4 connects another output of voltage sampling circuit and the negative pole of bus capacitor C1, diode D1 connection bus electric capacity C1 positive pole, bus capacitor C1 two ends are connected with the input of inverter respectively, and the output of inverter connects electrical network.
When having multiple photovoltaic substrate group string, the just parallel connection of its negative input end and positive input terminal how several branch roads, other then do not change.
If 3 photovoltaic substrate group strings connect all on request and install, then its open circuit voltage and short circuit current should be close, and operationally, the electric current of each group of string also should be very close.Existing photovoltaic DC-to-AC converter only detects total input current, does not detect the electric current of each group of string, cannot judge the current conditions of each group of string.
When SW1 closes, photovoltaic substrate group string 1 is connected to input, when bus capacitor C1 fill full after just no longer include electric current, now photovoltaic substrate group string 1 is in open-circuit condition, the open circuit voltage of photovoltaic substrate group string 1 can be detected by voltage sampling circuit; When SW4 closes, the output current of photovoltaic substrate group string 1 increases gradually, finally reaches short circuit current, and this electric current can be detected by CS1.
Group string 2, the group open circuit voltage of string 3 and short circuit current can be detected by same method, to the open circuit voltage of the 3 groups of group strings detected and short circuit current, control program can by judging which group group string has problem.If detect, wherein two groups of group string open circuit voltages and short circuit current are close to equal, and the 3rd group differs greatly with these two groups, then tentatively can judge that the 3rd group of string has fault.Now, can input switch SW1, SW2 of only closed photovoltaic substrate group string 1, photovoltaic substrate group string 2, inverter enters starting state, photovoltaic substrate group string 3 is closed again after inverter normally works, now judge whether input power increases, if increase, LCD only reports warning message, and prompting client checks photovoltaic group string-like state; If input power is constant or reduce, then disconnect SW3, inverter continues to run, and LCD reports an error false information, and prompting client has photovoltaic group string to have fault, cisco unity malfunction.
Other detection modes respectively organizing string are the same.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (3)
1. organize an optical crosstalk volt fault of converter testing circuit more, it is characterized in that: the negative input end of several photovoltaic substrate group strings is connected in parallel; Positive input terminal is connected in parallel after being connected with an a current sensor CS and controllable switch S W respectively again, then an input of voltage sampling circuit is connected, the negative input end of photovoltaic substrate group string connects another input of voltage sampling circuit, be connected a boost circuit between the output of voltage sampling circuit and the input of inverter, the output of inverter connects electrical network.
2. many group optical crosstalks lie prostrate fault of converter testing circuit according to claim 1, it is characterized in that: described photovoltaic substrate group string quantity is at least three, and the negative input end of photovoltaic substrate group string 1, photovoltaic substrate group string 2, photovoltaic substrate group string 3 is connected in parallel, the positive input terminal of photovoltaic substrate group string 1 is connected with the input of the first current sensor CS1, the output of the first current sensor CS1 connects the input of the first controllable switch S W1, the positive input terminal of photovoltaic substrate group string 2 is connected with the input of the second current sensor CS2, the output of the second current sensor CS2 connects the input of the second controllable switch S W2, the positive input terminal of photovoltaic substrate group string 3 is connected with the input of the 3rd current sensor CS3, the output of the 3rd current sensor CS3 connects the input of the 3rd controllable switch S W3, first controllable switch S W1, second controllable switch S W2, the output of the 3rd controllable switch S W3 is connected in parallel, the output of the first controllable switch S W1 connects an input of voltage sampling circuit, and another input of voltage sampling circuit connects the negative input end of photovoltaic substrate group string 3.
3. many group optical crosstalk volt fault of converter testing circuits according to claim 1 or 2, it is characterized in that: described boost circuit comprises inductance L 1, 4th controllable switch S W4, diode D1 and bus capacitor C1, the input of described inductance L 1 is connected with an output of voltage sampling circuit, the output of inductance L 1 is connected with the 4th controllable switch S W4 and diode D1 respectively, 4th controllable switch S W4 connects another output of voltage sampling circuit and the negative pole of bus capacitor C1, diode D1 connection bus electric capacity C1 positive pole, bus capacitor C1 two ends are connected with the input of inverter respectively.
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| CN201420649764.9U CN204168233U (en) | 2014-10-31 | 2014-10-31 | Many groups optical crosstalk volt fault of converter testing circuit |
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| CN201420649764.9U CN204168233U (en) | 2014-10-31 | 2014-10-31 | Many groups optical crosstalk volt fault of converter testing circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821735A (en) * | 2015-04-17 | 2015-08-05 | 青岛艾迪森科技有限公司 | Special electric energy optimizing box for photovoltaic power station |
| CN104883127A (en) * | 2015-06-05 | 2015-09-02 | 广西大学 | Solar photovoltaic assembly integration unit fault detection circuit and detection method thereof |
| CN110768629A (en) * | 2019-11-13 | 2020-02-07 | 合肥工业大学 | Optimal layout method of photovoltaic array voltage and current sensors including fault discrimination |
| CN111162735A (en) * | 2020-03-03 | 2020-05-15 | 阳光电源股份有限公司 | Boost circuit failure detection method and device |
| CN111525890A (en) * | 2020-04-24 | 2020-08-11 | 西安交通大学 | System and method for detecting photovoltaic module array fault by using bridge capacitor unbalanced current |
| CN112596000A (en) * | 2020-12-02 | 2021-04-02 | 爱士惟新能源技术(江苏)有限公司 | Method and device for detecting reverse connection of PV input ends of photovoltaic inverters |
| CN113328702A (en) * | 2021-07-09 | 2021-08-31 | 阳光电源股份有限公司 | PV ground fault detection method, string inverter and photovoltaic power station |
-
2014
- 2014-10-31 CN CN201420649764.9U patent/CN204168233U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821735A (en) * | 2015-04-17 | 2015-08-05 | 青岛艾迪森科技有限公司 | Special electric energy optimizing box for photovoltaic power station |
| CN104883127A (en) * | 2015-06-05 | 2015-09-02 | 广西大学 | Solar photovoltaic assembly integration unit fault detection circuit and detection method thereof |
| CN104883127B (en) * | 2015-06-05 | 2017-12-19 | 广西大学 | The failure detector circuit of solar photovoltaic assembly integrated unit |
| CN110768629A (en) * | 2019-11-13 | 2020-02-07 | 合肥工业大学 | Optimal layout method of photovoltaic array voltage and current sensors including fault discrimination |
| CN111162735A (en) * | 2020-03-03 | 2020-05-15 | 阳光电源股份有限公司 | Boost circuit failure detection method and device |
| CN111525890A (en) * | 2020-04-24 | 2020-08-11 | 西安交通大学 | System and method for detecting photovoltaic module array fault by using bridge capacitor unbalanced current |
| CN111525890B (en) * | 2020-04-24 | 2021-09-07 | 西安交通大学 | System and method for detecting photovoltaic module array fault by using bridge capacitor unbalanced current |
| CN112596000A (en) * | 2020-12-02 | 2021-04-02 | 爱士惟新能源技术(江苏)有限公司 | Method and device for detecting reverse connection of PV input ends of photovoltaic inverters |
| CN113328702A (en) * | 2021-07-09 | 2021-08-31 | 阳光电源股份有限公司 | PV ground fault detection method, string inverter and photovoltaic power station |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |