CN104935010A - Method and device for controlling input over-voltage start of photovoltaic inverter - Google Patents
Method and device for controlling input over-voltage start of photovoltaic inverter Download PDFInfo
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- CN104935010A CN104935010A CN201510355483.1A CN201510355483A CN104935010A CN 104935010 A CN104935010 A CN 104935010A CN 201510355483 A CN201510355483 A CN 201510355483A CN 104935010 A CN104935010 A CN 104935010A
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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
Abstract
The invention is suitable for the technical field of electric power, and provides a method and a device for controlling input over-voltage start of a photovoltaic inverter. The method comprises the following steps: detecting whether the photovoltaic inverter is in a failure state or a standby state; when the photovoltaic inverter is in the failure state or the standby state, shielding the over-voltage failure detection of the photovoltaic inverter; and starting the photovoltaic inverter. According to the method and the device for controlling input over-voltage start of the photovoltaic inverter provided by the invention, the photovoltaic inverter can be normally started under the failure of input PV high voltage or high direct-current bus.
Description
Technical field
The invention belongs to technical field of electric power, machine control method and device are opened in the input overvoltage particularly relating to a kind of photovoltaic DC-to-AC converter.
Background technology
Existing grid-connected photovoltaic system generally has centralized, group string data, micro-inverse and emerging collecting and distributing type etc. technical scheme, but no matter which kind of scheme, the PV array in its system is all connected by each low power PV cell panel and or is formed in parallel.
Along with the proposition of grid-connected photovoltaic system high efficiency demand, the design of each photovoltaic plant improves group crosstalk pressure one after another, increase PV cell plate group string series connection joint number, this just means the raising of whole PV array open circuit voltage, and due to the negative temperature characteristic of PV cell voltage, its open circuit voltage is under cryogenic higher.
The power switch pipe used in existing grid-connected photovoltaic system, as insulated gate bipolar transistor (IGBT), is all the maximum power point operating voltage selecting to adapt to PV array, instead of open circuit voltage.Therefore, under grid-connected photovoltaic system works in limit, because the DC bus of inverter is directly connected with PV array, this makes DC bus can be operated in the open circuit voltage being less than PV array always.Such as: for the grid-connected photovoltaic system of 1000Vdc open circuit voltage; the maximum power point operating voltage of general PV array is 0.8 times of open circuit voltage; namely under steady operation, DC bus-bar voltage is no more than 800Vdc; the IGBT that inverter generally selects 1200V withstand voltage, the DC bus over-voltage protection point arranged when therefore running is at about 900Vdc.
In sum, along with the quantity of PV cell panel string increases, in grid-connected photovoltaic system inverter the standby or non-starting period between, PV array open circuit voltage is higher.And in order to protect the power switch pipe of inverter, the DC bus over-voltage protection point of grid-connected photovoltaic system setting all can be lower, so can cause because input direct voltage is high or DC bus-bar voltage is high and cannot normally start.
Summary of the invention
The object of the embodiment of the present invention is that machine control method and device are opened in the input overvoltage providing a kind of photovoltaic DC-to-AC converter, solves that input direct voltage due to photovoltaic DC-to-AC converter is high or DC bus-bar voltage is high and the problem that cannot normally start.
The embodiment of the present invention is achieved in that machine control method is opened in a kind of input overvoltage of photovoltaic DC-to-AC converter, and described method comprises the steps:
Detect photovoltaic DC-to-AC converter and whether be in malfunction or holding state;
When photovoltaic DC-to-AC converter is in malfunction or holding state, the fault detect of shielding photovoltaic DC-to-AC converter bus overvoltage;
Open photovoltaic DC-to-AC converter.
Further, after the described unlatching photovoltaic DC-to-AC converter of execution, also comprise:
Recover the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
Further, before the fault detect of execution described recovery photovoltaic DC-to-AC converter bus overvoltage, also comprise:
Judging that the busbar voltage of described photovoltaic DC-to-AC converter is whether in the first scope preset, is perform and recover the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
Further, before the fault detect of execution described recovery photovoltaic DC-to-AC converter bus overvoltage, also comprise:
Judge whether default time delay, be, performed and recover the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
Further, described unlatching photovoltaic inversion implement body comprises:
Detect the DC bus-bar voltage of described photovoltaic DC-to-AC converter;
When the DC bus-bar voltage of described photovoltaic DC-to-AC converter is in the second scope preset, judge whether operating instruction, if having, then perform inversion modulation; Otherwise continue to detect DC bus-bar voltage;
Judge that whether described photovoltaic DC-to-AC converter inverter voltage is same frequently with identical width with line voltage, if so, then control grid-connected switch and close, described photovoltaic inverter grid-connected is run; Otherwise continue to detect DC bus-bar voltage.
Machine control device is opened in the input overvoltage that the present invention also proposes a kind of photovoltaic DC-to-AC converter, and described device comprises:
Whether detection module, be in malfunction or holding state for detecting photovoltaic DC-to-AC converter;
Shroud module, during for being in malfunction or holding state when photovoltaic DC-to-AC converter, the fault detect of shielding photovoltaic DC-to-AC converter bus overvoltage;
Open machine module, for opening photovoltaic DC-to-AC converter.
Further, described device also comprises:
Recover detection module, for recovering the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
Further, described device also comprises:
First judge module, for judging that the busbar voltage of described photovoltaic DC-to-AC converter is whether in the first scope preset, is perform and recover the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
Further, described device also comprises:
Second judge module, for having judged whether default time delay, has been, performs and recovers the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
Further, open machine module described in specifically to comprise:
Detecting unit, for detecting the DC bus-bar voltage of described photovoltaic DC-to-AC converter;
Modulating unit, for when the DC bus-bar voltage of described photovoltaic DC-to-AC converter is in the second scope preset, has judged whether operating instruction, if having, then performs inversion modulation; Otherwise return detecting unit to continue to detect DC bus-bar voltage;
And net unit, for judging that whether described photovoltaic DC-to-AC converter inverter voltage is same frequently with identical width with line voltage, if so, then controlling grid-connected switch and closing, described photovoltaic inverter grid-connected is run; Otherwise return detecting unit to continue to detect DC bus-bar voltage.
The embodiment of the present invention is when whether photovoltaic DC-to-AC converter is in malfunction or holding state, by the fault detect of shielding photovoltaic DC-to-AC converter bus overvoltage, make photovoltaic inversion electricity generation system can adapt to have PV array or the DC power supply of high open circuit voltage (as close to 1000Vdc), even if the high open circuit voltage that inversion system starts moment causes overvoltage fault also can normal boot-strap; The embodiment of the present invention does not need the power electric device (IGBT) selecting more high voltage-rated, can not therefore improve system cost, conduction loss, reduces system effectiveness.
Accompanying drawing explanation
Fig. 1 is the flow chart that machine control method is opened in the input overvoltage of the photovoltaic DC-to-AC converter that the embodiment of the present invention one provides;
Fig. 2 is the flow chart that machine control method is opened in the input overvoltage of the photovoltaic DC-to-AC converter that the embodiment of the present invention two provides;
Fig. 3 is that the flow chart recovering overvoltage and detect is opened in machine control method in the input overvoltage of the photovoltaic DC-to-AC converter that the embodiment of the present invention two provides;
Fig. 4 is the structure chart that machine control device is opened in the input overvoltage of the photovoltaic DC-to-AC converter that the embodiment of the present invention three provides;
Fig. 5 is that the structure chart opening machine module in machine control device is opened in the input overvoltage of the photovoltaic DC-to-AC converter that the embodiment of the present invention three provides;
Fig. 6 is the structure chart that machine control device is opened in the input overvoltage of the photovoltaic DC-to-AC converter that the embodiment of the present invention four provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
embodiment one
Machine control method is opened in the input overvoltage that the embodiment of the present invention one proposes a kind of photovoltaic DC-to-AC converter.As shown in Figure 1, the method for the embodiment of the present invention one comprises the steps:
Whether S1, detection photovoltaic DC-to-AC converter are in malfunction or holding state.Photovoltaic DC-to-AC converter current operating conditions comprises malfunction, holding state and the state that is incorporated into the power networks; malfunction refers to the state that photovoltaic DC-to-AC converter is shut down due to fault; the state that holding state refers to inverter fault-free, meets compressor start up condition, waits for power-on command; the state of being incorporated into the power networks refers to that the grid-connected switch of the interchange of photovoltaic DC-to-AC converter closes, the state of normally generating electricity by way of merging two or more grid systems.
S2, when photovoltaic DC-to-AC converter is in malfunction or holding state, shielding photovoltaic DC-to-AC converter bus overvoltage fault detect, otherwise return step S1 and continue to detect photovoltaic DC-to-AC converter and whether be in malfunction or holding state.
S3, unlatching photovoltaic DC-to-AC converter, specifically comprise:
Detect the DC bus-bar voltage of photovoltaic DC-to-AC converter;
When the DC bus-bar voltage of photovoltaic DC-to-AC converter is in the second scope preset, judges whether operating instruction, if having, then performed next step; Otherwise continue to detect DC bus-bar voltage;
Photovoltaic DC-to-AC converter inversion is modulated;
Judge that whether photovoltaic DC-to-AC converter inverter voltage is same frequently with identical width with line voltage, if so, then perform next step; Otherwise continue to detect DC bus-bar voltage;
Control grid-connected switch to close, photovoltaic inverter grid-connected is run.
Perform bus constant-pressure operation or MPPT operation control strategy;
The method of the embodiment of the present invention one is by the fault detect of shielding photovoltaic DC-to-AC converter bus overvoltage, make photovoltaic inversion electricity generation system can adapt to have PV array or the DC power supply of high open circuit voltage (as close to 1000Vdc), even if the high open circuit voltage that inversion system starts moment causes overvoltage fault also can normal boot-strap; The embodiment of the present invention one does not need the power electric device (IGBT) selecting more high voltage-rated, can not therefore improve system cost, conduction loss, reduces system effectiveness.
embodiment two
Machine control method is opened in the input overvoltage that the embodiment of the present invention two proposes a kind of photovoltaic DC-to-AC converter, as shown in Figure 2, after the step S3 performing the embodiment of the present invention one, also comprises step:
S4: judging that the DC bus-bar voltage of photovoltaic DC-to-AC converter is whether in the first scope preset, is perform step S6; Or, S5: judged whether default time delay, be, performed step S6;
S6, the fault detect of recovery photovoltaic DC-to-AC converter bus overvoltage.
The embodiment of the present invention two is recovered overvoltage and is detected after photovoltaic DC-to-AC converter opens machine, realizes overvoltage protection.
As shown in Figure 3, be DC bus-bar voltage overvoltage fault detect treatment step, comprise:
S11, busbar voltage analog signal sampling processing, overvoltage condition signal transacting;
S12, judging whether shielding DC bus-bar voltage overvoltage fault detect, otherwise perform step S13, is perform step S16;
S13, photovoltaic DC-to-AC converter overvoltage fault detect process, produce overvoltage mark;
S14, judge the DC bus-bar voltage whether overvoltage of photovoltaic DC-to-AC converter; Be perform step S15, otherwise return step S11;
S15, forbid that PWM sends out ripple, trigger fault is also warned, process ends.
S16, photovoltaic DC-to-AC converter forbid overvoltage fault detect, remove overvoltage mark, return step S11.
embodiment three
Machine control device is opened in the input overvoltage that the embodiment of the present invention three proposes a kind of photovoltaic DC-to-AC converter, and this device can be photovoltaic DC-to-AC converter, also can be to connect in photovoltaic DC-to-AC converter or an external device.As shown in Figure 4, the device of the embodiment of the present invention three comprises:
Whether detection module 10, be in malfunction or holding state for detecting photovoltaic DC-to-AC converter;
Shroud module 20, during for being in malfunction or holding state when photovoltaic DC-to-AC converter, the fault detect of shielding photovoltaic DC-to-AC converter bus overvoltage;
Open machine module 30, for opening photovoltaic DC-to-AC converter.
As shown in Figure 5, open machine module 30 specifically to comprise:
Detecting unit 31, for detecting the DC bus-bar voltage of described photovoltaic DC-to-AC converter;
Modulating unit 32, for when the DC bus-bar voltage of photovoltaic DC-to-AC converter is in the second scope preset, has judged whether operating instruction, if having, then performs inversion modulation; Otherwise return detecting unit 31 to continue to detect DC bus-bar voltage;
And net unit 33, for judging that whether photovoltaic DC-to-AC converter inverter voltage is same frequently with identical width with line voltage, if so, then controlling grid-connected switch and closing, photovoltaic inverter grid-connected is run; Otherwise return detecting unit 31 to continue to detect DC bus-bar voltage.
Particularly, the device operation principle of the embodiment of the present invention two is as follows:
Detection module 10 detects photovoltaic DC-to-AC converter and whether is in malfunction or holding state.Photovoltaic DC-to-AC converter current operating conditions comprises malfunction, holding state and the state that is incorporated into the power networks; malfunction refers to the state that photovoltaic DC-to-AC converter is shut down due to fault; the state that holding state refers to inverter fault-free, meets compressor start up condition, waits for power-on command; the state of being incorporated into the power networks refers to that the grid-connected switch of the interchange of photovoltaic DC-to-AC converter closes, the state of normally generating electricity by way of merging two or more grid systems.
When photovoltaic DC-to-AC converter is in malfunction or holding state, shroud module 20 shields the fault detect of photovoltaic DC-to-AC converter bus overvoltage, otherwise return detection module 10 continue detect photovoltaic DC-to-AC converter whether be in malfunction or holding state.
Open machine module 30 and open photovoltaic DC-to-AC converter, specifically comprise:
Detecting unit 31 detects the DC bus-bar voltage of photovoltaic DC-to-AC converter, and when the busbar voltage of photovoltaic DC-to-AC converter is in the second scope preset, modulating unit 32 has judged whether operating instruction, if continue to detect DC bus-bar voltage without returning detecting unit 31.If have, perform inversion modulation, and by and net unit 33 judge whether realize with electrical network with frequency with identical width.Then return detecting unit 31 if not to continue to detect DC bus-bar voltage, if then grid-connected contactor closes, be incorporated into the power networks, perform constant voltage or MPPT.
The device of the embodiment of the present invention two is by the fault detect of shielding photovoltaic DC-to-AC converter bus overvoltage, make photovoltaic inversion electricity generation system can adapt to have PV array or the DC power supply of high open circuit voltage (as close to 1000Vdc), even if the high open circuit voltage that inversion system starts moment causes overvoltage fault also can normal boot-strap; The embodiment of the present invention one does not need the power electric device (IGBT) selecting more high voltage-rated, can not therefore improve system cost, conduction loss, reduces system effectiveness.
embodiment four
Machine control device is opened in the input overvoltage that the embodiment of the present invention four proposes a kind of photovoltaic DC-to-AC converter, as shown in Figure 6, on the basis of the embodiment of the present invention three, also comprises:
First judge module 40, for judging that the busbar voltage of photovoltaic DC-to-AC converter is whether in the first scope preset, and is, being performed by recovery detection module 50 and recovering the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
Second judge module 50, for having judged whether default time delay, has been, is performed recover the fault detect of photovoltaic DC-to-AC converter bus overvoltage by recovery detection module 50.
Recover detection module 60, for recovering the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
Particularly, recover detection module 60 and first carry out busbar voltage analog signal sampling processing, overvoltage condition signal transacting, then judge whether that the overvoltage of enable busbar voltage detects, otherwise forbid that overvoltage detects, remove overvoltage mark, and return and carry out busbar voltage analog signal sampling processing, overvoltage condition signal transacting.Be perform overvoltage check processing, produce overvoltage mark, and continue to judge the busbar voltage whether overvoltage of photovoltaic DC-to-AC converter.Be perform and forbid that PWM sends out ripple, trigger fault is also warned, otherwise returns and carry out busbar voltage analog signal sampling processing, overvoltage condition signal transacting.
The embodiment of the present invention four is recovered overvoltage and is detected after photovoltaic DC-to-AC converter opens machine, realizes overvoltage protection.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a machine control method is opened in the input overvoltage of photovoltaic DC-to-AC converter, and it is characterized in that, described method comprises the steps:
Detect photovoltaic DC-to-AC converter and whether be in malfunction or holding state;
When photovoltaic DC-to-AC converter is in malfunction or holding state, the fault detect of shielding photovoltaic DC-to-AC converter bus overvoltage;
Open photovoltaic DC-to-AC converter.
2. the method for claim 1, is characterized in that, after the described unlatching photovoltaic DC-to-AC converter of execution, also comprises:
Recover the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
3. method as claimed in claim 2, is characterized in that, before the fault detect of execution described recovery photovoltaic DC-to-AC converter bus overvoltage, also comprises:
Judging that the busbar voltage of described photovoltaic DC-to-AC converter is whether in the first scope preset, is perform and recover the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
4. method as claimed in claim 2, is characterized in that, before the fault detect of execution described recovery photovoltaic DC-to-AC converter bus overvoltage, also comprises:
Judge whether default time delay, be, performed and recover the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
5. the method as described in any one of Claims 1-4, is characterized in that, described unlatching photovoltaic inversion implement body comprises:
Detect the DC bus-bar voltage of described photovoltaic DC-to-AC converter;
When the DC bus-bar voltage of described photovoltaic DC-to-AC converter is in the second scope preset, judge whether operating instruction, if having, then perform inversion modulation; Otherwise continue to detect DC bus-bar voltage;
Judge that whether described photovoltaic DC-to-AC converter inverter voltage is same frequently with identical width with line voltage, if so, then control grid-connected switch and close, described photovoltaic inverter grid-connected is run; Otherwise continue to detect DC bus-bar voltage.
6. a machine control device is opened in the input overvoltage of photovoltaic DC-to-AC converter, and it is characterized in that, described device comprises:
Whether detection module, be in malfunction or holding state for detecting photovoltaic DC-to-AC converter;
Shroud module, during for being in malfunction or holding state when photovoltaic DC-to-AC converter, the fault detect of shielding photovoltaic DC-to-AC converter bus overvoltage;
Open machine module, for opening photovoltaic DC-to-AC converter.
7. device as claimed in claim 6, it is characterized in that, described device also comprises:
Recover detection module, for recovering the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
8. device as claimed in claim 7, it is characterized in that, described device also comprises:
First judge module, for judging that the busbar voltage of described photovoltaic DC-to-AC converter is whether in the first scope preset, is perform and recover the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
9. device as claimed in claim 7, it is characterized in that, described device also comprises:
Second judge module, for having judged whether default time delay, has been, performs and recovers the fault detect of photovoltaic DC-to-AC converter bus overvoltage.
10. the device according to any one of claim 6 to 9, is characterized in that, described in open machine module and specifically comprise:
Detecting unit, for detecting the DC bus-bar voltage of described photovoltaic DC-to-AC converter;
Modulating unit, for when the DC bus-bar voltage of described photovoltaic DC-to-AC converter is in the second scope preset, has judged whether operating instruction, if having, then performs inversion modulation; Otherwise return detecting unit to continue to detect DC bus-bar voltage;
And net unit, for judging that whether described photovoltaic DC-to-AC converter inverter voltage is same frequently with identical width with line voltage, if so, then controlling grid-connected switch and closing, described photovoltaic inverter grid-connected is run; Otherwise return detecting unit to continue to detect DC bus-bar voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510355483.1A CN104935010A (en) | 2015-06-24 | 2015-06-24 | Method and device for controlling input over-voltage start of photovoltaic inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510355483.1A CN104935010A (en) | 2015-06-24 | 2015-06-24 | Method and device for controlling input over-voltage start of photovoltaic inverter |
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| CN104935010A true CN104935010A (en) | 2015-09-23 |
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| CN201510355483.1A Pending CN104935010A (en) | 2015-06-24 | 2015-06-24 | Method and device for controlling input over-voltage start of photovoltaic inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108011396A (en) * | 2017-12-13 | 2018-05-08 | 阳光电源股份有限公司 | A kind of capacitive reactive power compensation method and system |
| CN112087127A (en) * | 2020-07-23 | 2020-12-15 | 传蔚电气(上海)有限公司 | Inverter startup logic method |
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| US20040165408A1 (en) * | 2003-02-21 | 2004-08-26 | Mr.Rick West | Dc to ac inverter with single-switch bipolar boost circuit |
| CN102347700A (en) * | 2010-07-29 | 2012-02-08 | 通用电气公司 | Photovoltaic inverter system and method of starting same at high open-circuit voltage |
| CN104701885A (en) * | 2015-04-02 | 2015-06-10 | 深圳市英威腾电气股份有限公司 | Starting method and control system for photovoltaic grid-connected inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040165408A1 (en) * | 2003-02-21 | 2004-08-26 | Mr.Rick West | Dc to ac inverter with single-switch bipolar boost circuit |
| CN102347700A (en) * | 2010-07-29 | 2012-02-08 | 通用电气公司 | Photovoltaic inverter system and method of starting same at high open-circuit voltage |
| CN104701885A (en) * | 2015-04-02 | 2015-06-10 | 深圳市英威腾电气股份有限公司 | Starting method and control system for photovoltaic grid-connected inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108011396A (en) * | 2017-12-13 | 2018-05-08 | 阳光电源股份有限公司 | A kind of capacitive reactive power compensation method and system |
| CN112087127A (en) * | 2020-07-23 | 2020-12-15 | 传蔚电气(上海)有限公司 | Inverter startup logic method |
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Application publication date: 20150923 |