CN107276019A - A kind of dynamic over-current protection method of photovoltaic DC-to-AC converter - Google Patents
A kind of dynamic over-current protection method of photovoltaic DC-to-AC converter Download PDFInfo
- Publication number
- CN107276019A CN107276019A CN201710717540.5A CN201710717540A CN107276019A CN 107276019 A CN107276019 A CN 107276019A CN 201710717540 A CN201710717540 A CN 201710717540A CN 107276019 A CN107276019 A CN 107276019A
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- Prior art keywords
- photovoltaic
- cur
- converter
- igbt
- temp
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1227—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to abnormalities in the output circuit, e.g. short circuit
Abstract
A kind of dynamic over-current protection method of photovoltaic DC-to-AC converter, it comprises the following steps：Obtain photovoltaic DC-to-AC converter standard Celsius temperature temp；Counter cnt1 is incremented by if being very more than cur_max if cur, and otherwise cnt1 successively decreases；Cnt1 such as larger than 0 closes IGBT outputs；Such as less than it is equal to 0 reading cur and obtains cur_hp=f (temp)；The data signal that alternator current sensor is gathered is converted to the negative terminal input value of comparator；Latch level is low then photovoltaic DC-to-AC converter excessively stream；Latch level is incremented by for low hour counter cnt2, and otherwise cnt successively decreases；Judge whether cnt2 is more than 0, such as larger than 0 control IGBT control circuit completes the secondary closing of IGBT outputs；Such as less than being equal to 0 reseting lock storaging circuit makes latch cicuit export high level.The present invention obtains temperature temp and obtains hardware overcurrent protection threshold value according to formula f (temp), and when cur is higher than overcurrent protection threshold value, IGBT controls circuit automatically cuts off IGBT outputs, realizes the dynamic overcurrent protection of photovoltaic DC-to-AC converter.
Description
Technical field
The present invention relates to field of new energy technologies, the dynamic overcurrent protection of particularly a kind of photovoltaic DC-to-AC converter.
Background technology
The premise for exporting same current in photovoltaic DC-to-AC converter is small, and the higher IGBT of temperature overcurrent capability is poorer, for a long time
Excessively stream can shorten IGBT service lifes.The curve provided according to IGBT producers, the maximum current of different temperature output also differs
Sample, existing technology is the overcurrent protection threshold value that hardware design is fixed, and the setting of overcurrent protection threshold value is too high can not be effectively timely
IGBT is protected, overcurrent protection threshold value sets too low IGBT current output capabilities to obtain best embodiment.
The content of the invention
In order to solve the above technical problems, the invention provides a kind of dynamic over-current protection method of photovoltaic DC-to-AC converter, it includes
Following steps：
S1：The data signal that alternator current sensor is collected is converted to electric current cur；
S2:Whether more than default overcurrent protection threshold value cur_max be true, then counter cnt1 is passed if true if judging cur
Increase, otherwise cnt1 successively decreases；
S3:Judge whether cnt1 is more than 0, such as larger than 0 control IGBT control circuit closes IGBT outputs, is such as less than equal to
0 performs step S4；
S4：Photovoltaic DC-to-AC converter standard Celsius temperature temp is obtained by single-chip microcomputer and hardware overcurrent protection is obtained according to temp
Threshold value cur_hp, cur_hp=f (temp), wherein wherein f (cur)=K1-K* (temp/max_temp), K, K1 are default ginseng
Number, max_temp is that photovoltaic DC-to-AC converter allows the maximum temperature of work；
S5：Cur_hp is converted into analog voltage by single-chip microcomputer, and the analog voltage is converted by level shifting circuit
For the anode input value of comparator；
S6：The data signal that alternator current sensor is gathered is by negative terminal of the level translation circuit conversion for comparator
Input value；
S7：When the negative terminal input value of comparator is more than the anode input value of comparator, comparator will export low level, when
Comparator comparator when the negative terminal input value of comparator is less than the anode input value of comparator will export high level, and comparator is defeated
Latch, do not latched during high level when going out low level；
S8：Latch level is low then photovoltaic DC-to-AC converter excessively stream, and IGBT control circuits automatically cut off IGBT outputs；Latch level
It is incremented by for low hour counter cnt2, otherwise cnt successively decreases；
S9：Judge whether counter cnt2 is more than 0, such as larger than 0 passes through while latch cicuit closes IGBT outputs
Single-chip microcomputer control IGBT control circuits complete the secondary closing of IGBT outputs, and photovoltaic DC-to-AC converter completes power-off and realizes that dynamic excessively stream is protected
Shield；Such as less than being equal to 0 reseting lock storaging circuit makes latch cicuit export high level, and reseting lock storaging circuit controls circuit by IGBT
Automatic to recover IGBT outputs, photovoltaic DC-to-AC converter, which completes to be powered, realizes the Dynamic- Recovery of photovoltaic DC-to-AC converter.
The invention has the advantages that：
The present invention obtains temperature temp and obtains hardware overcurrent protection threshold value, overcurrent protection threshold value according to formula f (temp)
Comparator positive and negative terminal is respectively fed to the output generator current cur of acquisition, IGBT is controlled when cur is higher than overcurrent protection threshold value
Circuit automatically cuts off IGBT outputs, realizes the dynamic overcurrent protection of photovoltaic DC-to-AC converter.
Certainly, any product for implementing the present invention it is not absolutely required to while reaching all the above advantage.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, used required for being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ability
For the those of ordinary skill of domain, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other attached
Figure.
Fig. 1 is the dynamic overcurrent protection schematic flow sheet of photovoltaic DC-to-AC converter provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is all other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in figure 1, the invention provides a kind of dynamic over-current protection method of photovoltaic DC-to-AC converter, it comprises the following steps：
S1：The data signal that alternator current sensor is collected is converted to electric current cur；
S2:Whether more than default overcurrent protection threshold value cur_max be true, then counter cnt1 is passed if true if judging cur
Increase, otherwise cnt1 successively decreases；
S3:Judge whether cnt1 is more than 0, such as larger than 0 control IGBT control circuit closes IGBT outputs, is such as less than equal to
0 performs step S4；
S4：Photovoltaic DC-to-AC converter standard Celsius temperature temp is obtained by single-chip microcomputer and hardware overcurrent protection is obtained according to temp
Threshold value cur_hp, cur_hp=f (temp), wherein wherein f (cur)=K1-K* (temp/max_temp), K, K1 are default ginseng
Number, max_temp is that photovoltaic DC-to-AC converter allows the maximum temperature of work；
S5：Cur_hp is converted into analog voltage by single-chip microcomputer, and the analog voltage is converted by level shifting circuit
For the anode input value of comparator；
S6：The data signal that alternator current sensor is gathered is by negative terminal of the level translation circuit conversion for comparator
Input value；
S7：When the negative terminal input value of comparator is more than the anode input value of comparator, comparator will export low level, when
Comparator comparator when the negative terminal input value of comparator is less than the anode input value of comparator will export high level, and comparator is defeated
Latch, do not latched during high level when going out low level；
S8：Latch level is low then photovoltaic DC-to-AC converter excessively stream, and IGBT control circuits automatically cut off IGBT outputs；Latch level
It is incremented by for low hour counter cnt2, otherwise cnt successively decreases；
S9：Judge whether counter cnt2 is more than 0, such as larger than 0 passes through while latch cicuit closes IGBT outputs
Single-chip microcomputer control IGBT control circuits complete the secondary closing of IGBT outputs, and photovoltaic DC-to-AC converter completes power-off and realizes that dynamic excessively stream is protected
Shield；Such as less than being equal to 0 reseting lock storaging circuit makes latch cicuit export high level, and reseting lock storaging circuit controls circuit by IGBT
Automatic to recover IGBT outputs, photovoltaic DC-to-AC converter, which completes to be powered, realizes the Dynamic- Recovery of photovoltaic DC-to-AC converter.
The present invention obtains temperature temp and obtains hardware overcurrent protection threshold value, overcurrent protection threshold value according to formula f (temp)
Comparator positive and negative terminal is respectively fed to the output generator current cur of acquisition, IGBT is controlled when cur is higher than overcurrent protection threshold value
Circuit automatically cuts off IGBT outputs, realizes the dynamic overcurrent protection of photovoltaic DC-to-AC converter.
Present invention disclosed above preferred embodiment is only intended to help and illustrates the present invention.Preferred embodiment is not detailed
All details of narration, it is only described embodiment that the invention is not limited yet.Obviously, according to the content of this specification,
It can make many modifications and variations.This specification is chosen and specifically describes these embodiments, is to preferably explain the present invention
Principle and practical application so that skilled artisan can be best understood by and utilize the present invention.The present invention is only
Limited by claims and its four corner and equivalent.
Claims (1)
1. the dynamic over-current protection method of a kind of photovoltaic DC-to-AC converter, it is characterised in that comprise the following steps：
S1：The data signal that alternator current sensor is collected is converted to electric current cur；
S2:Judge that cur is more than whether default overcurrent protection threshold value cur_max is true, then counter cnt1 is incremented by if true, no
Then cnt1 successively decreases；
S3:Judge whether cnt1 is more than 0, such as larger than 0 control IGBT control circuit closes IGBT outputs, such as less than equal to 0
Perform step S4；
S4：Photovoltaic DC-to-AC converter standard Celsius temperature temp is obtained by single-chip microcomputer and hardware overcurrent protection threshold value is obtained according to temp
Cur_hp, cur_hp=f (temp), wherein wherein f (cur)=K1-K* (temp/max_temp), K, K1 are parameter preset,
Max_temp is that photovoltaic DC-to-AC converter allows the maximum temperature of work
S5：Cur_hp is converted into analog voltage by single-chip microcomputer, and the analog voltage is converted into ratio by level shifting circuit
Compared with the anode input value of device；
S6：The data signal that alternator current sensor is gathered is inputted by level translation circuit conversion for the negative terminal of comparator
Value；
S7：When the negative terminal input value of comparator is more than the anode input value of comparator, comparator will export low level, when comparing
Comparator will export high level when the negative terminal input value of device is less than the anode input value of comparator, be locked during comparator output low level
Deposit, do not latched during high level；
S8：Latch level is low then photovoltaic DC-to-AC converter excessively stream, and IGBT control circuits automatically cut off IGBT outputs；Latch level is low
Hour counter cnt2 is incremented by, and otherwise cnt successively decreases；
S9：Judge whether counter cnt2 is more than 0, such as larger than 0 passes through monolithic while latch cicuit closes IGBT outputs
Machine control IGBT control circuits complete the secondary closing of IGBT outputs, and photovoltaic DC-to-AC converter completes power-off and realizes dynamic overcurrent protection；
Such as less than being equal to 0 reseting lock storaging circuit makes latch cicuit export high level, and reseting lock storaging circuit controls circuit certainly by IGBT
Dynamic to recover IGBT outputs, photovoltaic DC-to-AC converter, which completes to be powered, realizes the Dynamic- Recovery of photovoltaic DC-to-AC converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710717540.5A CN107276019A (en) | 2017-08-21 | 2017-08-21 | A kind of dynamic over-current protection method of photovoltaic DC-to-AC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710717540.5A CN107276019A (en) | 2017-08-21 | 2017-08-21 | A kind of dynamic over-current protection method of photovoltaic DC-to-AC converter |
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| CN107276019A true CN107276019A (en) | 2017-10-20 |
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| CN201710717540.5A Withdrawn CN107276019A (en) | 2017-08-21 | 2017-08-21 | A kind of dynamic over-current protection method of photovoltaic DC-to-AC converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449886A (en) * | 2018-11-23 | 2019-03-08 | 深圳古瑞瓦特新能源股份有限公司 | A kind of photovoltaic DC-to-AC converter control method and system |
| CN110474287A (en) * | 2018-05-09 | 2019-11-19 | Ls产电株式会社 | Inverter control method |
| CN112421577A (en) * | 2020-10-28 | 2021-02-26 | 爱士惟新能源技术(江苏)有限公司 | Rapid power-off protection method for photovoltaic inverter |
| CN115296272A (en) * | 2022-10-08 | 2022-11-04 | 美世乐(广东)新能源科技有限公司 | Overcurrent protection method of inverter |
-
2017
- 2017-08-21 CN CN201710717540.5A patent/CN107276019A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474287A (en) * | 2018-05-09 | 2019-11-19 | Ls产电株式会社 | Inverter control method |
| CN110474287B (en) * | 2018-05-09 | 2021-12-21 | Ls产电株式会社 | Inverter control method |
| CN109449886A (en) * | 2018-11-23 | 2019-03-08 | 深圳古瑞瓦特新能源股份有限公司 | A kind of photovoltaic DC-to-AC converter control method and system |
| CN109449886B (en) * | 2018-11-23 | 2024-02-23 | 深圳古瑞瓦特新能源有限公司 | Photovoltaic inverter control method and system |
| CN112421577A (en) * | 2020-10-28 | 2021-02-26 | 爱士惟新能源技术(江苏)有限公司 | Rapid power-off protection method for photovoltaic inverter |
| CN112421577B (en) * | 2020-10-28 | 2022-06-21 | 爱士惟新能源技术(江苏)有限公司 | Rapid power-off protection method for photovoltaic inverter |
| CN115296272A (en) * | 2022-10-08 | 2022-11-04 | 美世乐(广东)新能源科技有限公司 | Overcurrent protection method of inverter |
| CN115296272B (en) * | 2022-10-08 | 2023-01-06 | 美世乐(广东)新能源科技有限公司 | Overcurrent protection method of inverter |
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Application publication date: 20171020 |
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