CN203645570U - Inverter - Google Patents
Inverter Download PDFInfo
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- CN203645570U CN203645570U CN201320864559.XU CN201320864559U CN203645570U CN 203645570 U CN203645570 U CN 203645570U CN 201320864559 U CN201320864559 U CN 201320864559U CN 203645570 U CN203645570 U CN 203645570U
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- inverter
- module
- circuit breaker
- auxiliary contact
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- 238000001914 filtration Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010792 warming 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
Abstract
An inverter belongs to the technical field of power electronics. The inverter comprises two or more than two DC breakers which are connected in parallel and equipped with auxiliary contacts, a filtering decoupling module which is composed of a DC filter and a bus capacitor, a signal processing module, a power control module and an inversion module; and a public input end of the DC breakers which are connected in parallel is connected with an input end of the inverter, a public output end of the DC breakers which are connected in parallel is connected with an input end of the filtering decoupling module, the auxiliary contacts of the DC breakers are connected with corresponding input ends of the signal processing module, an output end of the signal processing module is connected with an input end of the power control module, an output end of the power control module is connected with a control end of the inversion module, an input end of the inversion module is connected with an output end of the filtering decoupling module, and an output end of the inversion module is connected with an output end of the inverter. The inverter has the advantages of being capable of detecting and monitoring connection and disconnection states of the DC breakers, and the inverter is guaranteed to operate normally.
Description
Technical field
The utility model belongs to electric and electronic technical field, is specifically related to a kind of inverter.
Background technology
Along with the continuous minimizing of the resource such as oil, coal, under the severe situation of global warming, the renewable natural energy resources such as solar energy, wind energy that environmental protection and reserves are extremely enriched is more and more subject to people's favor, has utilized the photovoltaic industry of solar energy to be surging forward.The Main Function of photovoltaic DC-to-AC converter is that the direct current of photovoltaic module output is converted into available alternating current by the power electronic element such as MOSFET, IGBT.For safety and consideration easy to maintenance, photovoltaic battery panel is generally all provided with DC circuit breaker at input side.High-power photovoltaic synchronization inverter adopts common bus structure and maximum direct current input current to exceed 1000A conventionally, but also more rare or price is very high at the existing market DC circuit breaker corresponding with this current specification, insider generally selects more common DC circuit breaker on two markets to replace.Although this scheme can reduce costs, but also produce following problem simultaneously: DC circuit breaker closes a floodgate not completely reliable, because artificial origin or electrical structure reason cause one of them DC circuit breaker not close a floodgate or do not have reliable situation of closing a floodgate to happen occasionally, if inverter does not detect the current operating state of two circuit breakers, still according to photovoltaic battery panel maximum power point output power, and now owing to there being not reliable combined floodgate of a DC circuit breaker, another reliable circuit breaker closing a floodgate must bear all direct current input currents, in the time that input current exceedes its rated current, circuit breaker automatic trip, inverter cannot continue power output.
In view of above-mentioned prior art, be necessary to be improved, for this reason, the applicant has done useful design, and technical scheme described below produces under this background.
Summary of the invention
The purpose of this utility model is to provide a kind of inverter, can close a point state to DC circuit breaker and detect and monitor, and guarantees that inverter normally moves.
The purpose of this utility model reaches like this, a kind of inverter, it is characterized in that, comprise in parallel two or more DC circuit breaker with auxiliary contact, the filtering decoupling zero module being formed by a DC filter (EMC filter) and a bus capacitor, signal processing module, power control module and inversion module, the public input of the DC circuit breaker of described parallel connection is connected with the input of inverter, the public output of DC circuit breaker in parallel is connected with the input of filtering decoupling zero module, the auxiliary contact of DC circuit breaker connect with the input of corresponding signal processing module, the output of signal processing module connects the input of described power control module, the output of power control module connects the control end of described inversion module, the input of inversion module connects the output of filtering decoupling zero module, the output of inversion module is connected with the output of inverter.
In a specific embodiment of the present utility model, the auxiliary contact of described DC circuit breaker are normally opened contact or normally-closed contact.
In another specific embodiment of the present utility model, the auxiliary contact of described DC circuit breaker are normally opened contact, after each auxiliary contact series connection, are connected with signal processing module.
In another specific embodiment of the present utility model, the auxiliary contact of described DC circuit breaker are normally-closed contact, after each auxiliary contact parallel connection, are connected with signal processing module.
In another specific embodiment of the present utility model, the auxiliary contact of described DC circuit breaker are normally opened contact or normally-closed contact, and each auxiliary contact connect respectively a signal processing module.
The utility model is owing to having adopted said structure, and compared with prior art, the beneficial effect having is: can point state that closes of two or more DC circuit breakers be detected and be monitored, thereby guarantee that inverter normally moves.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Fig. 2 is workflow diagram of the present utility model.
Fig. 3 is the electrical connection schematic diagram of the DC circuit breaker auxiliary contact of the utility model one embodiment.
Fig. 4 is the electrical connection schematic diagram of the DC circuit breaker auxiliary contact of another embodiment of the utility model.
The electrical connection schematic diagram of the DC circuit breaker auxiliary contact that Fig. 5 is the another embodiment of the utility model.
Embodiment
In order to make the public can fully understand technical spirit of the present utility model and beneficial effect; applicant will describe in detail embodiment of the present utility model below by reference to the accompanying drawings; but applicant is not the restriction to technical scheme to the description of embodiment, anyly changes in the form rather than substance and all should be considered as protection range of the present utility model according to the utility model design.
Refer to Fig. 1, a kind of inverter, comprise two or more DC circuit breakers with auxiliary contact, filtering decoupling zero module, signal processing module, power control module and the inversion module being formed by a DC filter and a bus capacitor in parallel, herein, only illustrated two DC circuit breakers, the auxiliary contact of DC circuit breaker can be normally opened contact or normally-closed contact.DC circuit breaker is closed a floodgate, its auxiliary contact are according to the State-output auxiliary signal of circuit breaker, in the situation that auxiliary contact are normally opened contact, if circuit breaker reliably closes a floodgate, auxiliary contact become closure state, if circuit breaker does not close a floodgate successfully or unreliable combined floodgate, auxiliary contact remain open; In the situation that auxiliary contact are normally-closed contact, if circuit breaker reliably closes a floodgate, auxiliary contact become off-state, successfully or not reliably close a floodgate if do not close a floodgate, and auxiliary contact remain closed.The public input of the DC circuit breaker of described parallel connection is connected with the input of inverter, two inputs of DC circuit breaker in parallel adopt the mode of common bus and the positive-negative output end of DC power supply to be connected herein, the output of DC circuit breaker in parallel is connected with the input of the DC filter of filtering decoupling zero module, the output of DC filter is connected with bus capacitor two ends, the auxiliary contact of DC circuit breaker connect with the input of corresponding signal processing module, the output of signal processing module connects the input of described power control module, the output of power control module connects the control end of described inversion module, the input of inversion module connects the two ends of the bus capacitor of filtering decoupling zero module, the output of inversion module is connected with the output of inverter, herein three outputs of inversion module respectively with the L1 of electrical network, L2, L3 holds connection.The auxiliary contact signal of DC circuit breaker is changed into level signal by signal processing module, power control module carries out MPPT maximum power point tracking (English full name: Maximum Power Point Tracking according to this level signal to the power output of inverter inversion module, be called for short: MPPT) control, direct current is changed into alternating current by inversion module.
Refer to Fig. 2, and in conjunction with Fig. 1, operation principle of the present utility model is described.The rated current of supposing DC circuit breaker is Ir, usually, rated current and the 2*Ir=k*Ipmax of two described DC circuit breakers, wherein, Ipmax is direct current input maximum current, k is current stabilizing factor, desirable 1.1～1.3, the input current of establishing again inverter is I, and the concrete course of work is: DC circuit breaker closes a floodgate, inverter obtains electric, and power control module detects the parameters of inverter until meet entry condition; Power control module receives the level signal of signal processing module, and judge DC circuit breaker according to this level signal close a point state, now inverter startup; If described level signal is all status signals of closure of two DC circuit breakers, power control module carries out MPPT power searching to the input power of inverter, until inverter is made maximum power output, inverter normally moves; If described level signal is to have a DC circuit breaker to have the status signal of separating brake, power control module carries out MPPT power searching to the input power of inverter, if when the input current I now searching is less than or equal to the rated current Ir of DC circuit breaker, stop MPPT operation, inverter continues normal operation, if when the input current I searching is greater than the rated current Ir of DC circuit breaker, power control module is by the input power of inversion module control inverter, make input current I equal the rated current Ir of DC circuit breaker, inverter normally moves.
embodiment 1:
Refer to Fig. 3, what K1, the K2 in figure represented respectively two DC circuit breakers often drives auxiliary contact, and described auxiliary contact K1, K2 are connected in series, and resistance R is as the pull-up resistor of signal processing module.If in the time having a DC circuit breaker not close a floodgate successfully or reliably not close a floodgate, the circuit of auxiliary contact K1, K2 series connection remains open state, indicate that DC circuit breaker disconnects, output cut-off signal.The cut-off signal of signal processing module reception auxiliary contact K1, K2 series circuit is the formal output with high level at IO mouth.Power control module receives after this high level signal, and the input power of inverter is carried out to MPPT power searching, if the input current I now searching is less than or equal to the rated current Ir of DC circuit breaker, inverter continues normal operation; If the input current I searching is greater than the rated current Ir of DC circuit breaker, power control module, by the input power of inversion module control inverter, makes input current I equal the rated current Ir of DC circuit breaker, and inverter normally moves.If in the time that two DC circuit breakers all reliably close a floodgate, the circuit of auxiliary contact K1, K2 series connection becomes closure state, represents DC circuit breaker closure, output closure signal.The closure signal that signal processing module receives auxiliary contact K1, K2 series circuit at IO mouth with low level formal output, power control module receives after this low level signal, the input power of inverter is carried out to MPPT power searching, until inverter is made maximum power output, inverter normally moves.
embodiment 2:
Refer to Fig. 4, K1, the K2 in figure represents respectively the normally closed auxiliary contact of two DC circuit breakers, and described auxiliary contact K1, K2 are connected in parallel, and resistance R is as the pull-up resistor of signal processing module.If in the time having a DC circuit breaker not close a floodgate successfully or reliably not close a floodgate, the circuit of auxiliary contact K1, K2 parallel connection is kept closed, represent that DC circuit breaker disconnects, output cut-off signal.Signal processing module receives the cut-off signal of auxiliary contact K1, K2 parallel circuits and exports at IO mouth with low level form.Power control module receives after this low level signal, and the input power of inverter is carried out to MPPT power searching, if the input current I now searching is less than or equal to the rated current Ir of DC circuit breaker, inverter continues normal operation; If the input current I searching is greater than the rated current Ir of DC circuit breaker, power control module, by the input power of inversion module control inverter, makes input current I equal the rated current Ir of DC circuit breaker, and inverter normally moves.
If in the time that two DC circuit breakers all reliably close a floodgate, the circuit of auxiliary contact K1, K2 parallel connection becomes off-state, represents breaker closing, output closure signal.Signal processing module receives the closure signal of auxiliary contact K1, K2 parallel circuits and exports at IO mouth with the form of high level.Power control module receives after this high level signal, and the input power of inverter is carried out to MPPT power searching, until inverter is made maximum power output, inverter normally moves.
embodiment 3:
Refer to Fig. 5, what K1, the K2 in figure represented respectively two DC circuit breakers often drives auxiliary contact, and described auxiliary contact K1, K2 connect respectively a signal processing module, and resistance R 1, R2 are respectively as the pull-up resistor of two signal processing modules.If in the time that DC circuit breaker corresponding to auxiliary contact K1 do not close a floodgate successfully or reliably close a floodgate, the circuit of auxiliary contact K1 series connection remains open, and represents that its corresponding DC circuit breaker disconnects, output cut-off signal.The signal processing module being connected with auxiliary contact K1 receives the cut-off signal of auxiliary contact K1 and exports at IO-1 mouth with the form of high level, power control module receives after this high level signal, the input power of inverter is carried out to MPPT power searching, if the input current I now searching is less than or equal to the rated current Ir of DC circuit breaker, inverter continues normal operation; If the input current I searching is greater than the rated current Ir of DC circuit breaker, power control module, by the input power of inversion module control inverter, makes input current I equal the rated current Ir of DC circuit breaker, and inverter normally moves.If in the time that DC circuit breaker corresponding to auxiliary contact K2 do not close a floodgate successfully or reliably close a floodgate, operation principle is same as described above, repeats no more herein.If in the time that two DC circuit breakers corresponding to auxiliary contact K1, K2 all reliably close a floodgate, the circuit of auxiliary contact K1, K2 all becomes closure state, represents corresponding breaker closing, output closure signal.Two signal processing modules receive the closure signal of auxiliary contact K1, K2 circuit and export at IO-1 mouth, IO-2 mouth respectively with low level form, power control module receives after low level signal, the input power of inverter is carried out to MPPT power searching, until inverter is made maximum power output, inverter normally moves.Herein, the auxiliary contact of described DC circuit breaker also can be normally-closed contact, and similarly, thereby the description thereof will be omitted for its circuit theory.
Claims (5)
1.
a kind of inverter, it is characterized in that, comprise in parallel two or more DC circuit breaker with auxiliary contact, the filtering decoupling zero module being formed by a DC filter and a bus capacitor, signal processing module, power control module and inversion module, the public input of described DC circuit breaker in parallel is connected with the input of inverter, the public output of DC circuit breaker in parallel is connected with the input of filtering decoupling zero module, the auxiliary contact of DC circuit breaker connect with the input of corresponding signal processing module, the output of signal processing module connects the input of described power control module, the output of power control module connects the control end of described inversion module, the input of inversion module connects the output of filtering decoupling zero module, the output of inversion module is connected with the output of inverter.
2.
a kind of inverter according to claim 1, is characterized in that the auxiliary contact of described DC circuit breaker are normally opened contact or normally-closed contact.
3.
a kind of inverter according to claim 1 and 2, is characterized in that the auxiliary contact of described DC circuit breaker are normally opened contact, after each auxiliary contact series connection, is connected with signal processing module.
4.
a kind of inverter according to claim 1 and 2, is characterized in that the auxiliary contact of described DC circuit breaker are normally-closed contact, after each auxiliary contact parallel connection, is connected with signal processing module.
5.
a kind of inverter according to claim 1 and 2, is characterized in that the auxiliary contact of described DC circuit breaker are normally opened contact or normally-closed contact, and each auxiliary contact connect respectively a signal processing module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320864559.XU CN203645570U (en) | 2013-12-26 | 2013-12-26 | Inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320864559.XU CN203645570U (en) | 2013-12-26 | 2013-12-26 | Inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203645570U true CN203645570U (en) | 2014-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320864559.XU Expired - Lifetime CN203645570U (en) | 2013-12-26 | 2013-12-26 | Inverter |
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| Country | Link |
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| CN (1) | CN203645570U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114460866A (en) * | 2021-12-27 | 2022-05-10 | 西门子工厂自动化工程有限公司 | Signal control method and device for main loop and computer readable medium |
-
2013
- 2013-12-26 CN CN201320864559.XU patent/CN203645570U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114460866A (en) * | 2021-12-27 | 2022-05-10 | 西门子工厂自动化工程有限公司 | Signal control method and device for main loop and computer readable medium |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140611 |
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| CX01 | Expiry of patent term |