CN114421750A - Dynamic protection control method for inverter power switching tube - Google Patents
Dynamic protection control method for inverter power switching tube Download PDFInfo
- Publication number
- CN114421750A CN114421750A CN202111682806.XA CN202111682806A CN114421750A CN 114421750 A CN114421750 A CN 114421750A CN 202111682806 A CN202111682806 A CN 202111682806A CN 114421750 A CN114421750 A CN 114421750A
- Authority
- CN
- China
- Prior art keywords
- inverter
- wave
- voltage
- threshold
- bus voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a dynamic protection control method for a power switch tube of an inverter, wherein a sampling and control unit is connected with a bus of the inverter and is simultaneously connected to the power switch tube; the power switch tube is connected to the bus in a serial or parallel mode and the like and is also connected to the alternating current output end of the inverter; the sampling and control unit monitors and acquires inverter input voltage and bus voltage, converts the inverter input voltage and the bus voltage into low-voltage die signals, transmits the low-voltage die signals to the inverter system control module, compares the low-voltage die signals with preset dynamic thresholds of the inverter bus voltage and the output power, and adjusts the power switch tube protection threshold according to the comparison result.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation systems, in particular to a dynamic protection control method for a power switching tube of an inverter.
Background
With the increasingly wide market application of photovoltaic inverters, the inverter has greater pressure on the cost of the whole inverter, the cost of a power switch tube can be effectively reduced by using single tubes in parallel connection compared with module integration, but the parasitic parameters of a PCB (printed circuit board) circuit are inevitably increased by using the single tubes in parallel connection, so that the voltage stress of the power switch tube in a switching state is worse, and a more reliable dynamic protection method for the power switch tube is urgently needed.
If the photovoltaic inverter runs in an unstable state, such as photovoltaic cell voltage sudden change, mains supply short circuit, mains supply voltage sudden change and the like, the power switch tube is easy to have working conditions of high voltage and large current, the internal parameters of the inverter are in a limit design state, and if the protection threshold value of the inverter is not adjusted, the stress of the power switch can exceed the range of a device, so that overvoltage damage or overcurrent damage is caused.
In view of the above application problems, a new solution is needed to provide a reliable protection for the power transistor by processing the sampling signal to obtain a hardware wave-by-wave current limiting and hardware overcurrent protection process that meets the safe working requirement of the power transistor.
Disclosure of Invention
The invention provides a dynamic protection control method for an inverter power switch tube, which carries out dynamic control of wave-by-wave current limiting and hardware overcurrent protection of the inverter power switch tube through input voltage, bus voltage, output power and a power switch tube protection threshold of an inverter, realizes reliable protection of the power switch tube, is simple to realize, has no additional devices on the original basis, and saves cost.
In order to solve the technical problem, the invention provides a dynamic protection control method for an inverter power switch tube, which is applied to a sampling and control unit of an inverter, wherein the sampling and control unit is connected with an inverter bus and is simultaneously connected to the power switch tube; the power switch tube is connected to the bus in a serial or parallel mode and the like and is also connected to the alternating current output end of the inverter; the control method comprises the following steps: the sampling and control unit monitors and acquires inverter input voltage and bus voltage, converts the inverter input voltage and the bus voltage into low-voltage module signals, transmits the low-voltage module signals to the inverter system control module, compares the low-voltage module signals with preset dynamic thresholds of the inverter bus voltage and output power, adjusts a power switch tube protection threshold according to a comparison result, and dynamically controls wave-by-wave current limiting and hardware overcurrent protection of an inverter power switch tube, wherein the maximum value of the inverter input voltage is U4, and the threshold of the inverter input voltage triggering high-voltage load drop is U3'; when the input voltage of the inverter is less than U3', the maximum output power Pm is output, and the wave-by-wave current limit and the hardware overcurrent point of the power switch tube are set as the original set value according to the dynamic linear change of the output power of the inverter; when the input voltage of the inverter is between the maximum value U4 of the input voltage and the threshold value of the input voltage of the inverter triggering high voltage drop load and the output power is limited to a point U3 of Pm/n, the wave-by-wave current limiting of the power switch tube and the hardware overcurrent point are set to be 1/n of the original set value according to the dynamic linear change of the output power of the inverter.
Preferably, the power switch tube protection threshold includes an output power threshold and a current overcurrent threshold.
Preferably, when the inverter input voltage is Ux, the output power of the inverter is
The power switch tube wave-by-wave current limiting and hardware overcurrent point are set as the original set value according to the dynamic linear change of the output power of the inverter
Wherein, U3 is more than or equal to Ux is more than or equal to U4.
Preferably, the sampling and control unit obtains a bus voltage Udc of the inverter, a highest value of the bus voltage of the inverter is Udc3, a first threshold of the bus voltage of the inverter is Udc1 ', and a second threshold point of the bus voltage of the inverter is Udc 2'; when reversingWhen the bus voltage Udc of the transformer is smaller than a first threshold Udc1 ', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is set to an initial value Iocp, and when the bus voltage of the inverter reaches the first threshold Udc1 ' but does not reach a second threshold Udc2 ', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is reduced to the initial value Iocp
After the bus voltage of the inverter exceeds a second threshold point Udc 2', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is reduced to an initial value Iocp
And (4) doubling.
Preferably, when the input voltage of the inverter reaches U3 ', the input voltage starts to enter a high voltage drop load, and the bus voltage corresponding to the inverter is Udc 4'; the wave-by-wave current limiting and hardware overcurrent threshold point synchronously decreases, when the bus voltage Udc of the inverter is smaller than Udc4 ', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is set to be an initial value Iocp, when the bus voltage of the inverter reaches Udc4 ', the inverter system control module starts to trigger the wave-by-wave current limiting and hardware overcurrent threshold point adjusting curve of the power switch tube, and when the bus voltage Udc of the inverter is between Udc4 ' and Udc3, the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube decreases to the initial value Iocp
And the power switching tube current limiting step by step and the hardware overcurrent threshold point are dynamically adjusted along with the bus voltage Ux of the inverter.
Preferably, the inverter input voltage Upv is between Upv1 and Upv2, the inverter system control module controls the bus voltage Udc to be fixed to Udc 1; when the input voltage of the inverter is greater than Upv2, the inverter system control module controls the bus voltage Udc to float, and the Udc is equal to Upv/m, wherein m is a floating coefficient less than 1; and when the inverter input voltage Upv is greater than Upv3, the inverter system control module controls the bus voltage Udc to be fixed to Ud 3.
Preferably, the input voltage and the bus voltage of the inverter are acquired through the sampling and control unit, the inverter system control module calculates and judges whether the protection threshold value currently used for protecting the power switch tube meets the preset dynamic threshold values of the bus voltage and the output power of the inverter, and if not, the current state is maintained to continue to operate.
Preferably, the input voltage and the bus voltage of the inverter are obtained through sampling by the sampling and control unit, whether the current dynamic threshold value for protecting the power switch tube meets the preset dynamic threshold values of the bus voltage and the output power of the inverter is calculated and judged by the inverter system control module, if yes, threshold value adjustment is carried out according to the preset dynamic threshold values of the bus voltage and the output power of the inverter, whether the threshold values are proper is continuously judged, and the operation is repeated.
Preferably, the wave-by-wave current limiting of the power switching tube and the dynamic threshold protection of the hardware overcurrent point can be arranged on the direct current side or the alternating current side of the photovoltaic inverter system.
After the method is adopted, the dynamic protection control method of the inverter power switch tube is applied to a sampling and control unit of the inverter, and the sampling and control unit is connected with an inverter bus and is simultaneously connected to the power switch tube; the power switch tube is connected to the bus in a serial or parallel mode and the like and is also connected to the alternating current output end of the inverter; the control method comprises the following steps: the sampling and control unit monitors and acquires inverter input voltage and bus voltage, converts the inverter input voltage and the bus voltage into low-voltage module signals, transmits the low-voltage module signals to the inverter system control module, compares the low-voltage module signals with preset dynamic thresholds of the inverter bus voltage and output power, adjusts a power switch tube protection threshold according to a comparison result, and dynamically controls wave-by-wave current limiting and hardware overcurrent protection of an inverter power switch tube, wherein the maximum value of the inverter input voltage is U4, and the threshold of the inverter input voltage triggering high-voltage load drop is U3'; when the input voltage of the inverter is less than U3', the maximum output power Pm is output, and the wave-by-wave current limit and the hardware overcurrent point of the power switch tube are set as the original set value according to the dynamic linear change of the output power of the inverter; when the input voltage of the inverter is between the maximum value U4 of the input voltage and the threshold value of the input voltage of the inverter triggering high voltage drop load and the output power is limited to a point U3 of Pm/n, the wave-by-wave current limiting of the power switch tube and the hardware overcurrent point are set to be 1/n of the original set value according to the dynamic linear change of the output power of the inverter; the dynamic protection control method for the inverter power switching tube performs dynamic control of wave-by-wave current limiting and hardware overcurrent protection of the inverter power switching tube through the input voltage, bus voltage, output power and a power switching tube protection threshold of the inverter, realizes reliable protection of the power switching tube, is simple to realize, does not have additional devices on the original basis, and saves cost.
Drawings
FIG. 1 is a control connection diagram of a dynamic protection control method for inverter power switching tubes according to the present invention;
FIG. 2 is a graph of the inverter output power limit of the inverter power switching tube dynamic protection control method of the present invention;
FIG. 3 is a diagram of dynamic nonlinear adjustment of ripple-by-ripple current limiting and hardware overcurrent for the inverter power switching tube dynamic protection control method of the present invention;
FIG. 4 is a diagram of dynamic linear adjustment of wave-by-wave current limiting and hardware overcurrent for the inverter power switching tube dynamic protection control method of the present invention;
fig. 5 is a mapping relation diagram of input voltage and dc bus voltage of the inverter power switching tube dynamic protection control method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Referring to fig. 1 and fig. 2, fig. 1 is a control connection diagram of a dynamic protection control method for a power switching tube of an inverter according to the present invention; FIG. 2 is a graph of the inverter output power limit of the inverter power switching tube dynamic protection control method of the present invention; the embodiment discloses a dynamic protection control method of an inverter power switch tube, which is applied to a sampling and control unit of an inverter,
as shown in fig. 1, a control connection diagram of the dynamic protection control method for the power switching tube of the inverter of the present invention is shown, and a wave-by-wave current limiting and hardware overcurrent dynamic protection system for the power switching tube of the photovoltaic inverter is formed by a photovoltaic inversion main system, a sampling signal, a threshold signal and a signal transmission path.
Referring to fig. 5, fig. 5 is a mapping relationship diagram of an input voltage and a dc bus voltage according to the dynamic protection control method for the inverter power switching tube of the present invention; in the present embodiment, the inverter system control module controls the fixing of the bus voltage Udc to Udc 1; when the input voltage of the inverter is greater than Upv2, the inverter system control module controls the bus voltage Udc to float, and the Udc is equal to Upv/m, wherein m is a floating coefficient less than 1; when the input voltage Upv of the inverter is greater than Upv3, the control module of the inverter system controls the bus voltage Udc to be fixed to Ud3, so that the phenomenon that the direct-current bus of the inverter floats too high due to the fact that the input voltage Upv of the inverter is high can be prevented, and the power switch tube is damaged due to failure of wave-by-wave current limiting and hardware overcurrent protection.
In the embodiment, the sampling and control unit is connected with the inverter bus and is also connected to the power switch tube; the power switch tube is connected to the bus in a serial or parallel mode and the like and is also connected to the alternating current output end of the inverter; the control method comprises the following steps: the sampling and control unit monitors and acquires inverter input voltage and bus voltage, converts the inverter input voltage and the bus voltage into low-voltage module signals, transmits the low-voltage module signals to the inverter system control module, compares the low-voltage module signals with preset dynamic thresholds of the inverter bus voltage and output power, adjusts a power switch tube protection threshold according to a comparison result, and dynamically controls wave-by-wave current limiting and hardware overcurrent protection of an inverter power switch tube, wherein the maximum value of the inverter input voltage is U4, and the threshold of the inverter input voltage triggering high-voltage load drop is U3';
the maximum value of the inverter input voltage Upv is U4, the inverter input voltage Upv is smaller than U3 'and can output the maximum output power Pm, when Upv is larger than U3', high voltage drop load is triggered, and when the inverter input voltage Upv continues to rise to U4, the output power of the inverter is reduced to zero;
when the input voltage of the inverter is less than U3', the maximum output power Pm is output, and the wave-by-wave current limit and the hardware overcurrent point of the power switch tube are set as the original set value according to the dynamic linear change of the output power of the inverter; when the input voltage of the inverter is between the maximum value U4 of the input voltage and the threshold value of the input voltage of the inverter triggering high voltage drop load and the output power is limited to a point U3 of Pm/n, the wave-by-wave current limiting of the power switch tube and the hardware overcurrent point are set to be 1/n of the original set value according to the dynamic linear change of the output power of the inverter.
In this embodiment, when the input voltage of the inverter is Ux, the output power of the inverter is
The power switch tube wave-by-wave current limiting and hardware overcurrent point are set as the original set value according to the dynamic linear change of the output power of the inverter
Wherein, U3 is more than or equal to Ux is more than or equal to U4.
The power switch tube wave-by-wave current limiting and the hardware overcurrent dynamic adjustment can adopt linear adjustment or nonlinear adjustment.
In this embodiment, the input voltage and the bus voltage of the inverter are obtained through the sampling and control unit, the inverter system control module calculates and judges whether the protection threshold value currently used for protecting the power switch tube meets the preset dynamic threshold values of the bus voltage and the output power of the inverter, and if not, the current state is maintained to continue to operate;
the method comprises the steps of obtaining input voltage and bus voltage of an inverter through sampling by a sampling and control unit, calculating and judging whether a dynamic threshold value used for protecting a power switch tube at present meets a preset dynamic threshold value of the bus voltage and output power of the inverter through a control module of an inverter system, adjusting the threshold value according to the preset dynamic threshold value of the bus voltage and the output power of the inverter if the dynamic threshold value meets the preset dynamic threshold value of the bus voltage and the output power of the inverter, continuously judging whether the threshold value is proper, and repeating the operation.
Example two
Referring to fig. 3, fig. 3 is a diagram illustrating dynamic nonlinear adjustment of ripple current limiting and hardware overcurrent for the dynamic protection control method of the inverter power switching tube according to the present invention;
in this embodiment, the wave-by-wave current limiting and hardware overcurrent dynamic adjustment of the power switching tube are performed by nonlinear adjustment, the sampling and control unit obtains a bus voltage Udc of the inverter, the highest value of the bus voltage of the inverter is Udc3, a first threshold value of the bus voltage of the inverter is Udc1 ', and a second threshold value point of the bus voltage of the inverter is Udc 2'; when the bus voltage Udc of the inverter is smaller than a first threshold Udc1 ', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is set to an initial value Iocp, and when the bus voltage of the inverter reaches the first threshold Udc1 ' but does not reach a second threshold Udc2 ', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is reduced to the initial value Iocp
After the bus voltage of the inverter exceeds a second threshold point Udc 2', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is reduced to an initial value Iocp
And (4) doubling.
EXAMPLE III
Referring to fig. 4, fig. 4 is a graph illustrating dynamic linear adjustment of the wave-by-wave current limiting and the hardware overcurrent of the inverter power switching tube dynamic protection control method according to the present invention;
in this embodiment, the power switching tube wave-by-wave current limiting and hardware overcurrent dynamic adjustment adopt nonlinear adjustment, when the input voltage of the inverter reaches U3 ', high voltage drop load starts to enter, and at this time, the bus voltage corresponding to the inverter is Udc 4'; the wave-by-wave current limiting and hardware overcurrent threshold point synchronously decreases, when the bus voltage Udc of the inverter is smaller than the Udc4 ', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is set to be an initial value Iocp, and when the bus voltage of the inverter reaches the Udc 4', the inverter system control module starts to triggerWhen the bus voltage Udc of the inverter is between Udc 4' and Udc3, the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is reduced to the initial value Iocp
And the power switching tube current limiting step by step and the hardware overcurrent threshold point are dynamically adjusted along with the bus voltage Ux of the inverter.
Example four
In this embodiment, the wave-by-wave current limiting of the power switching tube and the dynamic threshold protection of the hardware overcurrent point may be arranged on the dc side or the ac side of the photovoltaic inverter system.
The power switch tube of this embodiment may be an IGBT or a MOSFET tube, and in other embodiments, may also be other types of power devices.
The dynamic protection control method for the inverter power switching tube performs dynamic control of wave-by-wave current limiting and hardware overcurrent protection of the inverter power switching tube through the input voltage, bus voltage, output power and a power switching tube protection threshold of the inverter, realizes reliable protection of the power switching tube, is simple to realize, does not have additional devices on the original basis, and saves cost.
It should be understood that the above is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by the present specification and drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A dynamic protection control method of an inverter power switch tube is applied to a sampling and control unit of an inverter and is characterized in that the sampling and control unit is connected with a bus of the inverter and is simultaneously connected to the power switch tube; the power switch tube is connected to the bus in a serial or parallel mode and the like and is also connected to the alternating current output end of the inverter; the control method comprises the following steps: the sampling and control unit monitorsAcquiring inverter input voltage and bus voltage, converting the inverter input voltage and the bus voltage into low-voltage module signals, transmitting the low-voltage module signals to an inverter system control module, comparing the low-voltage module signals with preset dynamic thresholds of the inverter bus voltage and output power, adjusting a power switch tube protection threshold according to a comparison result, and performing dynamic control on wave-by-wave current limiting and hardware overcurrent protection of an inverter power switch tube, wherein the maximum value of the inverter input voltage is U4, and the threshold of the inverter input voltage triggering high voltage load drop is U3'; outputting maximum output power P when inverter input voltage is less than U3mThe wave-by-wave current limiting and hardware overcurrent point of the power switch tube is set as an original set value according to the dynamic linear change of the output power of the inverter; when the inverter input voltage is between the maximum value of the input voltage U4 and the inverter input voltage threshold value triggering high voltage drop load, and the output power is limited to PmAnd at the point U3 of/n, the wave-by-wave current limiting of the power switching tube and the hardware overcurrent point are set to be 1/n of the original set value according to the dynamic linear change of the output power of the inverter.
2. The inverter power switching tube dynamic protection control method of claim 1, wherein the power switching tube protection threshold comprises an output power threshold and a current over-current threshold.
3. The inverter power switching tube dynamic protection control method of claim 1, wherein when the inverter input voltage is Ux, the output power of the inverter is Ux
The power switch tube wave-by-wave current limiting and hardware overcurrent point are set as the original set value according to the dynamic linear change of the output power of the inverter
Wherein, U3 is more than or equal to Ux is more than or equal to U4.
4. The inverter power switching tube dynamic protection of claim 1The control method is characterized in that the sampling and control unit acquires a bus voltage Udc of the inverter, the highest value of the bus voltage of the inverter is Udc3, a first threshold value of the bus voltage of the inverter is Udc1 ', and a second threshold value point of the bus voltage of the inverter is Udc 2'; when the bus voltage Udc of the inverter is smaller than a first threshold Udc1 ', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is set to an initial value Iocp, and when the bus voltage of the inverter reaches the first threshold Udc1 ' but does not reach a second threshold Udc2 ', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is reduced to the initial value Iocp
After the bus voltage of the inverter exceeds a second threshold point Udc 2', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is reduced to an initial value Iocp
And (4) doubling.
5. The dynamic protection control method of the inverter power switching tube of claim 1, wherein when the input voltage of the inverter reaches U3 ', the inverter starts to enter high voltage drop load, and the bus voltage corresponding to the inverter is Udc 4'; the wave-by-wave current limiting and hardware overcurrent threshold point synchronously decreases, when the bus voltage Udc of the inverter is smaller than Udc4 ', the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube is set to be an initial value Iocp, when the bus voltage of the inverter reaches Udc4 ', the inverter system control module starts to trigger the wave-by-wave current limiting and hardware overcurrent threshold point adjusting curve of the power switch tube, and when the bus voltage Udc of the inverter is between Udc4 ' and Udc3, the wave-by-wave current limiting and hardware overcurrent threshold point of the power switch tube decreases to the initial value Iocp
And the power switching tube current limiting step by step and the hardware overcurrent threshold point are dynamically adjusted along with the bus voltage Ux of the inverter.
6. The inverter power switching tube dynamic protection control method of claim 1, wherein the inverter input voltage Upv is between Upvl and Upv2, the inverter system control module controls a bus voltage Udc to be fixed to Udc 1; when the input voltage of the inverter is greater than Upv2, the inverter system control module controls the bus voltage Udc to float, and the Udc is equal to Upv/m, wherein m is a floating coefficient less than 1; and when the inverter input voltage Upv is greater than Upv3, the inverter system control module controls the bus voltage Udc to be fixed to Ud 3.
7. The inverter power switching tube dynamic protection control method of claim 1, characterized in that: the input voltage and the bus voltage of the inverter are obtained through the sampling and control unit, whether the protection threshold value used for protecting the power switch tube at present meets the preset dynamic threshold values of the bus voltage and the output power of the inverter or not is calculated and judged through the inverter system control module, and if not, the current state is maintained to continue to operate.
8. The inverter power switching tube dynamic protection control method of claim 1, further characterized by: the method comprises the steps of obtaining input voltage and bus voltage of an inverter through sampling by a sampling and control unit, calculating and judging whether a dynamic threshold value used for protecting a power switch tube at present meets a preset dynamic threshold value of the bus voltage and output power of the inverter through a control module of an inverter system, adjusting the threshold value according to the preset dynamic threshold value of the bus voltage and the output power of the inverter if the dynamic threshold value meets the preset dynamic threshold value of the bus voltage and the output power of the inverter, continuously judging whether the threshold value is proper, and repeating the operation.
9. The inverter power switching tube dynamic protection control method of claim 1, characterized in that: the power switch tube wave-by-wave current limiting and hardware overcurrent point dynamic threshold protection can be arranged on the direct current side or the alternating current side of the photovoltaic inverter system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111682806.XA CN114421750A (en) | 2021-12-30 | 2021-12-30 | Dynamic protection control method for inverter power switching tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111682806.XA CN114421750A (en) | 2021-12-30 | 2021-12-30 | Dynamic protection control method for inverter power switching tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114421750A true CN114421750A (en) | 2022-04-29 |
Family
ID=81270796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111682806.XA Pending CN114421750A (en) | 2021-12-30 | 2021-12-30 | Dynamic protection control method for inverter power switching tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114421750A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115242072A (en) * | 2022-09-16 | 2022-10-25 | 深圳市首航新能源股份有限公司 | Method and device for reducing stress of inverter tube and inverter |
-
2021
- 2021-12-30 CN CN202111682806.XA patent/CN114421750A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115242072A (en) * | 2022-09-16 | 2022-10-25 | 深圳市首航新能源股份有限公司 | Method and device for reducing stress of inverter tube and inverter |
| CN115242072B (en) * | 2022-09-16 | 2022-12-23 | 深圳市首航新能源股份有限公司 | Method and device for reducing stress of inverter tube and inverter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11799285B2 (en) | Method for starting photovoltaic rapid shutdown system, application apparatus and system | |
| EP4167422A1 (en) | Control method for photovoltaic rapid switching-off system, and application apparatus and system therefor | |
| KR101725087B1 (en) | Power control device for sub-module of mmc converter | |
| JP2007166810A (en) | Dc-dc converter | |
| CN108847835B (en) | Power device driving protection circuit and control method thereof | |
| CN114039544B (en) | Photovoltaic inverter, insulation resistance detection method and photovoltaic power generation system | |
| CN114421750A (en) | Dynamic protection control method for inverter power switching tube | |
| US11239746B2 (en) | Two-stage converter and method for starting the same, LLC converter, and application system | |
| US9343973B2 (en) | Power conversion apparatus | |
| US9712083B2 (en) | Method and device for switching operation mode of a five-level inverter | |
| CN109787290B (en) | Photovoltaic system and control circuit and control method thereof | |
| US11784494B2 (en) | Direct current power supply system, photovoltaic system, energy storage system, and optical storage system | |
| CN111987705A (en) | Direct current energy consumption system, electric power system and energy consumption method | |
| CN114244174B (en) | 380V auxiliary inverter power supply | |
| CN111641199B (en) | Overvoltage protection device and method applied to submarine observation network connection box | |
| CN210380245U (en) | Direct current energy consumption system and electric power system | |
| AU2021290491B2 (en) | Control method for photovoltaic rapid switching-off system, and application apparatus and system therefor | |
| CN113726209B (en) | Unloading circuit for wind power converter and control method thereof | |
| EP4167454A1 (en) | Power converter analog chip and power converter | |
| CN220122615U (en) | Auxiliary power supply overcurrent protection system suitable for wide-range voltage input | |
| CN113852320B (en) | Motor control circuit and variable frequency controller | |
| EP4145653A1 (en) | Short-circuit protection apparatus, short-circuit protection method for target circuit, and power conversion device | |
| US11652412B2 (en) | Control signal modulation circuit, inverter, and control system | |
| US20240079882A1 (en) | Photovoltaic Power Generation System Control Method, Photovoltaic Power Generation System, and Switching Apparatus | |
| CN109245055B (en) | Power conversion system, overcurrent protection circuit and method of power switch tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |