CN112737295B - Method for suppressing direct current component and related equipment - Google Patents
Method for suppressing direct current component and related equipment Download PDFInfo
- Publication number
- CN112737295B CN112737295B CN202011526292.4A CN202011526292A CN112737295B CN 112737295 B CN112737295 B CN 112737295B CN 202011526292 A CN202011526292 A CN 202011526292A CN 112737295 B CN112737295 B CN 112737295B
- Authority
- CN
- China
- Prior art keywords
- current sensor
- value
- current
- offset value
- working
- 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.)
- Active
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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- 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
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
Abstract
The invention relates to the technical field of direct current component suppression, in particular to a method for suppressing a direct current component and related equipment thereof, wherein the method comprises the steps of detecting the working state of a current sensor; determining a correction bias value of the current sensor according to the working state of the current sensor; calculating the sum of the corrected offset value and the initial offset value of the current sensor as the working offset value of the current sensor; and calculating the sampling value of the current sensor according to the working offset value of the current sensor and a pre-acquired current initial value. By adopting the technical scheme, the correction offset value can be determined according to the working state of the current sensor, a direct current component detection circuit is not required to be added on hardware, correction can be directly carried out on the basis of the initial value of the current, zero drift caused by temperature change, current change and the like is effectively reduced, sampling error is further reduced, and the problem that grid-connected current has large direct current component is avoided.
Description
Technical Field
The invention relates to the technical field of direct current component suppression, in particular to a method for suppressing a direct current component and related equipment thereof.
Background
The non-isolated inverter topology structure has the advantages of low cost, high efficiency, small size and the like, but the problem of direct-current component injection of grid-connected current exists, and the problem is particularly serious for a single-phase topology. The existence of direct current component easily causes the problems of transformer, mutual inductor saturation, substation grounding corrosion and the like.
In the inverter digital control system, the zero drift of the sampling value of the current sensor is a main cause of the direct current component of the grid-connected current. When the current loop controller adopts the regulator, the direct current interference of the forward channel can be effectively filtered, but the direct current drift of the current feedback channel can not be eliminated, so that sampling errors are generated, and the grid-connected current has larger direct current components.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for suppressing a dc component and related devices thereof, so as to overcome a problem that a larger dc component exists in a grid-connected current due to a sampling error caused by a dc drift of a current feedback channel that cannot be eliminated when a current loop controller adopts a regulator.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of suppressing a dc component, comprising:
detecting the working state of the current sensor;
determining a correction bias value of the current sensor according to the working state of the current sensor;
calculating the sum of the corrected offset value and the initial offset value of the current sensor to be used as the working offset value of the current sensor;
and calculating a sampling value of the current sensor according to the working offset value of the current sensor and a pre-acquired current initial value.
Further, in the above method for suppressing a dc component, the operating state includes an operating temperature;
the determining a corrected bias value of the current sensor according to the working state of the current sensor includes:
determining a temperature interval in which the working temperature is;
and taking the offset value corresponding to the temperature interval as the correction offset value.
Further, the method for suppressing a dc component described above further includes:
the correction bias value is recalculated once per duty cycle.
Further, in the above method for suppressing a direct current component, a temperature value corresponding to the temperature interval is in a direct proportion relationship with the offset value.
Further, in the method for suppressing a dc component described above, the operating state includes an operating power;
the determining a corrected bias value of the current sensor according to the working state of the current sensor includes:
determining a power interval in which the working power is positioned;
and determining the correction offset value according to a correction formula corresponding to the power interval.
Further, in the method for suppressing a dc component described above, the power interval includes an interval in which the operating power is 1/N of a rated power; wherein N is a positive number;
the correction formula corresponding to the power interval comprises: q ═ I (I)First stage-IForehead (forehead)/N)×k；
Q is a corrected offset value corresponding to the power interval, IFirst stageIs the initial value of the current, IForehead (forehead)And k is a multiplying factor, wherein k is the rated current value of the current sensor.
Further, in the above method for suppressing a dc component, a value of N includes 3.
Further, the above method for suppressing a dc component, before detecting an operating state of the current sensor, includes:
detecting a bias value of the current sensor;
and if the offset value is out of the preset range, outputting a fault prompt.
The present invention also provides a dc component suppressing apparatus, including:
the detection module is used for detecting the working state of the current sensor;
the determining module is used for determining a correction bias value of the current sensor according to the working state of the current sensor;
the calculation module is used for calculating the sum of the corrected offset value and the initial offset value of the current sensor to serve as the working offset value of the current sensor; and calculating a sampling value of the current sensor according to the working offset value of the current sensor and a pre-acquired current initial value.
The invention also provides a device for suppressing the direct current component, which comprises a processor and a memory, wherein the processor is connected with the memory:
the processor is used for calling and executing the program stored in the memory;
the memory is configured to store the program, and the program is configured to execute at least the method for suppressing a direct current component according to any one of the above.
The present invention also provides a current sensor characterized by comprising a current detection device and the above-described suppression device of a direct current component;
the current detection device is connected with the suppression device of the direct current component.
The invention also provides an inverter system comprising the above-mentioned dc component suppression device.
The invention also provides a power generation system comprising the inverter system.
The invention relates to a method for suppressing direct current component and relative device, wherein the method comprises detecting the working state of current sensor; determining a correction bias value of the current sensor according to the working state of the current sensor; calculating the sum of the corrected offset value and the initial offset value of the current sensor as the working offset value of the current sensor; and calculating the sampling value of the current sensor according to the working offset value of the current sensor and a pre-acquired current initial value. By adopting the technical scheme, the correction offset value can be determined according to the working state of the current sensor, a direct current component detection circuit is not required to be added on hardware, correction can be directly carried out on the basis of the initial value of the current, zero drift caused by temperature change, current change and the like is effectively reduced, sampling errors are further reduced, and the problem that grid-connected current has large direct current components is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for suppressing a DC component according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an apparatus for suppressing a DC component according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram provided by an embodiment of the dc component suppressing apparatus of the present invention;
fig. 4 is a schematic structural diagram provided by an embodiment of the current sensor of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 is a flowchart of a dc component suppressing method according to an embodiment of the present invention.
As shown in fig. 1, the present embodiment may include the following steps:
and S101, detecting the working state of the current sensor.
The current sensor can be detected to obtain the working state of the current sensor.
For example, the operating temperature, the operating power, and the like of the current sensor may be obtained, and the embodiment is not limited.
And S102, determining a correction bias value of the current sensor according to the working state of the current sensor.
In an alternative embodiment, the operating condition of the current sensor comprises an operating temperature. In this embodiment, the corrected offset value of the current sensor may be determined according to the following steps:
step one, determining a temperature interval of a working temperature;
and step two, taking the offset value corresponding to the temperature interval as a correction offset value.
Specifically, the current sampling is typically as follows: current sensor → sampling conditioning circuit → ADC module (inside DSP chip). The sampling value is converted into a digital signal by an ADC module in the DSP chip, and then the digital signal can be processed and calculated by a CPU. The temperature of the whole system is increased due to the increase of the operating power of the inverter, so that the temperature of the current sensor placed in the system is necessarily increased, the current sensor is sensitive to the temperature, the change of the temperature causes continuous error of a sampling value compared with an actual value, and the error of the sampling value and the actual value is larger and larger along with the increase of the temperature, so that the direct current component of the grid-connected side current exceeds the limit value specified by the standard, and the rear-end equipment is possibly damaged. In order to reduce the influence caused by the temperature, the present embodiment adopts a sectional compensation method, and a plurality of continuous temperature intervals can be set. For example, an initial temperature T is set0，[T0，T1) For the first temperature interval, [ T1，T2) For the second temperature interval, [ T ]2，T3) Is the third temperature interval, [ T ]3，T4) A fifth temperature interval and a sixth temperature interval may also be set according to an actual situation, which is not limited in this embodiment. Each temperature interval can correspond to an offset value, the temperature value corresponding to the temperature interval is in a direct proportion relation with the offset value, and the higher the temperature corresponding to the temperature interval is, the larger the offset value corresponding to the temperature interval is.
It should be noted that, a temperature test may be performed before the delivery of the current sensor, a temperature value with a small change in the offset value during the temperature change is divided into a temperature interval, and an average value of the offset values corresponding to all the temperature values in the temperature interval is used as the offset value corresponding to the temperature interval.
In an alternative embodiment, a way of dividing the temperature interval is provided, as shown in table 1.
TABLE 1
As shown in Table 1, in this embodiment, 8 temperature intervals are divided, and the initial temperature T is0The offset value is increased by 10 for every 10 c increase in temperature set at 10 c.
In an alternative embodiment, the modified offset value is recalculated once per duty cycle. The situation that the direct current component of the grid-connected side current exceeds the limit value specified by the standard and damages the back-end equipment is finally caused because the error between the sampling value and the actual value is larger and larger under the condition that the correction offset value is not changed along with the rise of the temperature.
In an alternative embodiment, the duty cycle is a power frequency cycle, i.e., 20 ms.
In an alternative embodiment, the operating state comprises operating power. In this embodiment, the corrected offset value of the current sensor may be determined according to the following steps:
step one, determining a power interval where working power is located;
and step two, determining a correction offset value according to a correction formula corresponding to the power interval.
Specifically, the current working power may be obtained first, and then the power interval where the working power is located may be determined according to the working power. And then, determining a correction offset value according to a correction formula corresponding to the power interval.
In an alternative embodiment, the power interval includes an interval in which the operating power is 1/N of the rated power; wherein N is a positive number.
The correction formula corresponding to the power interval comprises the following steps: q ═ I (I)First stage-IForehead (forehead)/N)×k；
Q is a corrected offset value corresponding to the power interval, IFirst stageIs an initial value of current, IForehead (forehead)The rated current value of the current sensor is used, k is a multiplying factor, and the value of the multiplying factor can be debugged according to the actual situation so as to determine the optimal multiplying factor through debugging.
In an optional embodiment, the value range of the multiplying factor is 1-1.15.
In an alternative embodiment, the test was performedSeveral power intervals such as 33%, 66% and 100% of rated power, wherein, the direct current component is larger and is difficult to satisfy in the case of 33% of rated power, so the N is taken as 3, and I is taken asForehead (forehead)And/3 is a comparison value. That is, in the present embodiment, the correction offset value is calculated only when the operating power is in the power range of 1/3 of the rated power.
And S103, calculating the sum of the corrected offset value and the initial offset value of the current sensor as the working offset value of the current sensor.
In an alternative embodiment, the initial bias value is a bias value inherent to the current sensor and may be determined by testing before factory shipment. In the later use process, the actual sampling value of the alternating current can be processed to obtain a more accurate initial offset value.
In an alternative embodiment, the operating condition includes an operating temperature, and the operating offset value may be determined according to table 2.
TABLE 2
Wherein, I0Is the initial offset value.
In an alternative embodiment, the operating state includes operating power, and the operating bias value may be determined according to the following equation.
QWorker's tool＝(IFirst stage-IForehead (forehead)/N)×k+I0
Wherein Q isWorker's toolIs the operating offset value, I0Is the initial offset value.
And S104, calculating a sampling value of the current sensor according to the working offset value of the current sensor and a pre-acquired current initial value.
In an optional embodiment, after the working offset value is obtained, the sampling value of the current sensor is calculated according to the initial current value and the working offset value acquired by the current sensor.
Specifically, the initial current value may be an average value of current values of the respective detection points acquired by the current sensor in the power frequency cycle.
The method for suppressing the direct current component of the embodiment includes detecting an operating state of a current sensor; determining a correction bias value of the current sensor according to the working state of the current sensor; calculating the sum of the corrected offset value and the initial offset value of the current sensor as the working offset value of the current sensor; and calculating the sampling value of the current sensor according to the working offset value of the current sensor and a pre-acquired current initial value. By adopting the technical scheme of the embodiment, the correction offset value can be determined according to the working state of the current sensor, a direct current component detection circuit does not need to be added on hardware, correction can be directly performed on the basis of the initial value of the current, zero drift caused by temperature change, current change and the like is effectively reduced, sampling errors are further reduced, and the problem that grid-connected current has large direct current components is avoided.
In an alternative embodiment, before the step of "detecting the operating state of the current sensor" in any of the above embodiments, the method further includes the following steps:
the method comprises the following steps: detecting an offset value of the current sensor;
step two: and if the offset value is out of the preset range, outputting a fault prompt.
Specifically, before starting to detect the operating state of the current sensor, it is detected whether the current sensor is normal. The offset value of the current sensor may be detected, and if the offset value of the current sensor is within a preset range, it indicates that the current sensor is normal, and the following steps may be continued. If the bias value of the current sensor is out of the preset range, the current sensor is possibly out of order, and a fault prompt is output to prompt a worker to replace the current sensor in time.
Based on a general inventive concept, the present invention further provides a dc component suppressing apparatus, for implementing the above method embodiments.
Fig. 2 is a schematic structural diagram provided by an embodiment of the dc component suppression apparatus of the present invention.
As shown in fig. 2, the dc component suppressing apparatus of the present embodiment includes:
the detection module 11 is used for detecting the working state of the current sensor;
the determining module 12 is configured to determine a correction offset value of the current sensor according to a working state of the current sensor;
the calculation module 13 is used for calculating the sum of the corrected offset value and the initial offset value of the current sensor as the working offset value of the current sensor; and calculating the sampling value of the current sensor according to the working offset value of the current sensor and a pre-acquired current initial value.
In the dc component suppressing apparatus of the present embodiment, the detecting module 11 detects the operating state of the current sensor; the determining module 12 determines a correction offset value of the current sensor according to the working state of the current sensor; the calculation module 13 calculates the sum of the corrected offset value and the initial offset value of the current sensor as the working offset value of the current sensor; and calculating the sampling value of the current sensor according to the working offset value of the current sensor and a pre-acquired current initial value. By adopting the technical scheme of the embodiment, the correction offset value can be determined according to the working state of the current sensor, a direct current component detection circuit does not need to be added on hardware, correction can be directly performed on the basis of the initial value of the current, zero drift caused by temperature change, current change and the like is effectively reduced, sampling errors are further reduced, and the problem that grid-connected current has large direct current components is avoided.
In an alternative embodiment, the operating condition includes an operating temperature;
the determining module 12 is specifically configured to determine a temperature interval where the working temperature is located; taking the offset value corresponding to the temperature interval as a correction offset value; the higher the temperature corresponding to the temperature interval, the larger the offset value corresponding to the temperature interval.
In an alternative embodiment, the calculation module 13 is further configured to recalculate the modified offset value once every duty cycle.
In an alternative embodiment, the operating state comprises operating power;
a determining module 12, specifically configured to determine a power interval in which the working power is located; and determining a correction offset value according to a correction formula corresponding to the power interval.
In an alternative embodiment, the power interval includes an interval in which the operating power is 1/N of the rated power; wherein N is a positive number;
the correction formula corresponding to the power interval comprises the following steps: q ═ I (I)First stage-IForehead (forehead)/N)×k；
Q is a corrected offset value corresponding to the power interval, IFirst stageIs an initial value of current, IForehead (forehead)K is a multiplying factor, and is the rated current value of the current sensor.
In an alternative embodiment, the value of N includes 3.
In an optional embodiment, the system further comprises an output module;
the detection module 11 is further configured to detect a working state of the current sensor;
and the output module is used for outputting fault prompt if the offset value is out of the preset range.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Based on a general inventive concept, the present invention further provides a dc component suppressing apparatus for implementing the above method embodiments.
Fig. 3 is a schematic structural diagram provided by an embodiment of the dc component suppression apparatus of the present invention.
As shown in fig. 3, the dc component suppressing apparatus of the present embodiment includes a processor 21 and a memory 22, and the processor 21 is connected to the memory 22. Wherein, the processor 21 is used for calling and executing the program stored in the memory 22; the memory 22 is used to store a program for executing at least the suppression method of the direct current component in the above embodiment.
The present invention also provides a current sensor based on one general inventive concept.
Fig. 4 is a schematic structural diagram provided by an embodiment of the current sensor of the present invention.
As shown in fig. 4, the current sensor of the present embodiment includes a current detection device 31 and a suppression device 32 of a direct current component of any of the above embodiments; the current detection device 31 is connected to a suppression device 32 for the dc component.
Based on one general inventive concept, the present invention also provides an inverter system including the dc component suppressing apparatus of any of the above embodiments.
Based on one general inventive concept, the present invention also provides a power generation system including the inverter system of any one of the above embodiments.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (11)
1. A method for suppressing a direct current component, comprising:
detecting the working state of the current sensor;
determining a correction bias value of the current sensor according to the working state of the current sensor;
calculating the sum of the corrected offset value and the initial offset value of the current sensor to be used as the working offset value of the current sensor;
calculating a sampling value of the current sensor according to a working bias value of the current sensor and a pre-acquired current initial value;
the working state comprises working temperature or working power;
the determining a corrected bias value of the current sensor according to the working state of the current sensor includes:
determining a temperature interval in which the working temperature is; taking the offset value corresponding to the temperature interval as the corrected offset value; or
Determining a power interval in which the working power is positioned; and determining the correction offset value according to a correction formula corresponding to the power interval.
2. The method for suppressing a direct current component according to claim 1, further comprising:
the correction bias value is recalculated once per duty cycle.
3. The method according to claim 1, wherein a temperature value corresponding to the temperature interval is in a direct proportion to the offset value.
4. The method according to claim 1, wherein the power interval includes an interval in which the operating power is 1/N of a rated power; wherein N is a positive number;
the correction formula corresponding to the power interval comprises: q = (I initial-I amount/N) × k;
q is a corrected offset value corresponding to the power interval, I is the initial current value, I is the rated current value of the current sensor, and k is a multiplying factor.
5. The method according to claim 4, wherein the value of N comprises 3.
6. The method for suppressing a direct current component according to claim 1, wherein the detecting an operating state of the current sensor is preceded by:
detecting a bias value of the current sensor;
and if the offset value is out of the preset range, outputting a fault prompt.
7. An apparatus for suppressing a direct current component, comprising:
the detection module is used for detecting the working state of the current sensor;
the determining module is used for determining a correction bias value of the current sensor according to the working state of the current sensor;
the calculation module is used for calculating the sum of the corrected offset value and the initial offset value of the current sensor to serve as the working offset value of the current sensor; calculating a sampling value of the current sensor according to a working bias value of the current sensor and a pre-acquired current initial value;
the working state comprises working temperature or working power;
the determining module is specifically configured to determine a temperature interval in which the operating temperature is located; taking the offset value corresponding to the temperature interval as the corrected offset value; or determining a power interval in which the working power is positioned; and determining the correction offset value according to a correction formula corresponding to the power interval.
8. A device for suppressing a dc component, comprising a processor and a memory, the processor being coupled to the memory:
the processor is used for calling and executing the program stored in the memory;
the memory is configured to store the program for executing at least the method for suppressing a direct-current component according to any one of claims 1 to 6.
9. A current sensor characterized by comprising a current detection device and the suppression device of the direct current component of claim 8;
the current detection device is connected with the suppression device of the direct current component.
10. An inverter system characterized by comprising the suppression apparatus of a direct current component according to claim 8.
11. A power generation system characterized by comprising the inverter system of claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011526292.4A CN112737295B (en) | 2020-12-22 | 2020-12-22 | Method for suppressing direct current component and related equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011526292.4A CN112737295B (en) | 2020-12-22 | 2020-12-22 | Method for suppressing direct current component and related equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112737295A CN112737295A (en) | 2021-04-30 |
| CN112737295B true CN112737295B (en) | 2022-02-01 |
Family
ID=75605436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011526292.4A Active CN112737295B (en) | 2020-12-22 | 2020-12-22 | Method for suppressing direct current component and related equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112737295B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166567A (en) * | 2011-12-19 | 2013-06-19 | Ls产电株式会社 | Apparatus and method for compensating offset of current sensor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849523B (en) * | 2015-05-15 | 2017-06-09 | 威胜集团有限公司 | The temperature compensation of single-phase electric energy meter |
| CN109286347B (en) * | 2017-07-19 | 2020-05-05 | 北京金风科创风电设备有限公司 | Method and device for compensating position of rotor of permanent magnet synchronous generator |
| CN110277922B (en) * | 2019-05-17 | 2020-07-21 | 杭州电子科技大学 | LL C primary side constant current control device and compensation current signal extraction method |
| CN110441648A (en) * | 2019-09-20 | 2019-11-12 | 杭州万高科技股份有限公司 | A kind of electric signal method for detecting abnormality, device, equipment |
-
2020
- 2020-12-22 CN CN202011526292.4A patent/CN112737295B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166567A (en) * | 2011-12-19 | 2013-06-19 | Ls产电株式会社 | Apparatus and method for compensating offset of current sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112737295A (en) | 2021-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101542435B1 (en) | Systems for and methods of controlling operation of a | |
| US10511233B2 (en) | Current estimating device | |
| CN111130074B (en) | Direct-current transmission line ultra-high-speed protection system and method based on voltage first extreme value time | |
| CN112737295B (en) | Method for suppressing direct current component and related equipment | |
| JP2012026836A (en) | Frequency detection method for distributed power source and system interconnection protection apparatus | |
| JP2019158674A (en) | Arc detection device, control method therefor, control program, and DC power supply system | |
| KR101768800B1 (en) | Offset and Scale Error Reduction Method According to Tracing Grid Phase Angle of Three-phase Grid-connected Inverters | |
| JP6452906B1 (en) | Power converter | |
| JP2010028977A (en) | Power supply unit | |
| KR101555480B1 (en) | Method for interleaving between rectifier and inverter for neutral harmonic current reduction of ups | |
| JP7156555B2 (en) | power converter controller | |
| JP2019103160A (en) | Power conversion system | |
| CN111262462A (en) | Filter capacitor failure detection method of inverter | |
| JP6996444B2 (en) | Power converter and flicker detection method | |
| US20230032675A1 (en) | Systems and methods to detect three-phase input power and change-of-phase on three-phase input power | |
| JP5293554B2 (en) | Power converter | |
| JP2013132118A (en) | Switching power supply device | |
| JP5309500B2 (en) | Power supply device and method for determining phase loss thereof | |
| US10479219B2 (en) | Controller for AC electric motor | |
| JP5768957B2 (en) | Control device for three-phase V-connection inverter | |
| CN116953586A (en) | Fault detection method for inverter circuit, power conversion device, and readable storage medium | |
| KR101556352B1 (en) | An apparatus and a method for protecting a grid connected inverter according to generating of grid under voltage | |
| CN117498669A (en) | Power equipment power output control method and power equipment | |
| CN115372847A (en) | Control device and method of battery test equipment | |
| JP2006266684A (en) | Higher harmonic detection apparatus |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |