CN115473414A - Current transformer current sensor failure detection method, medium and system - Google Patents
Current transformer current sensor failure detection method, medium and system Download PDFInfo
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- CN115473414A CN115473414A CN202211278052.6A CN202211278052A CN115473414A CN 115473414 A CN115473414 A CN 115473414A CN 202211278052 A CN202211278052 A CN 202211278052A CN 115473414 A CN115473414 A CN 115473414A
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- current sensor
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- alternating current
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- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- 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
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a failure detection method, medium and system for a current sensor of a current transformer, wherein the method comprises the following steps: s1, closing a distribution switch at the alternating current side of a converter to switch on an alternating current power grid load to carry out power output operation; s2, acquiring a direct current value and a corresponding direct current voltage value of the direct current sensor at the direct current side of the converter to obtain direct current side power Pdc; acquiring an alternating current value and a corresponding alternating voltage value of the alternating current sensor at the alternating current side of the converter to obtain alternating current side power Pac; calculating a power deviation value delta P = | Pdc-Pac | between the direct current side power Pdc and the alternating current side power Pac; s3, comparing the power deviation value delta P with a preset power deviation threshold value delta P1; when DeltaP > DeltaP1, judging that the current sensor has failure fault. The invention has the advantages of simple operation, low cost, sensitive detection and the like.
Description
Technical Field
The invention mainly relates to the technical field of converters, in particular to a method, medium and system for detecting failure of a current sensor of a converter.
Background
A converter is an electric energy conversion device that integrates a semiconductor switching device, an energy storage element (capacitor), and a filter, a controller, a distribution switch, and the like. Fig. 1 shows a main circuit system of a three-phase converter. As shown in fig. 1, the dc port of the device is connected to a dc power source (or load), and the ac port is connected to an ac load (or grid); the converter device realizes the electric energy conversion between two external ports through a direct current bus capacitor, a power conversion unit, an alternating current filter, a power distribution switch and the like; the current sensor is used for detecting a current signal and is used for realizing logic protection control and control algorithm of a controller of the converter device.
For safety and reliability, the current transformer detects and judges data of key devices before being started every time. And the converter controller implements overvoltage and undervoltage protection according to the acquired voltage information and implements overcurrent protection according to the acquired current information. Specifically, the visible voltage signal judgment is easy to realize. However, when the current sensor has a problem, and the collected current is smaller or the current is not collected, the converter controller is difficult to judge whether the operating power is smaller or the current sensor has a failure problem, so that the controller may not obtain a real current value, thereby causing a catastrophic failure. How to judge whether the current sensor fails is very critical to the reliable operation of the corresponding converter device.
A current sensor failure detection scheme is disclosed in the prior patent (the name of the invention: a conversion device, a current sensor failure detection method thereof, a new energy power generation system, application publication numbers CN 114389540A and 202210054159.6), as shown in fig. 2. The main contents of the abstract are as follows: the invention provides a conversion device, a current sensor failure detection method thereof and a new energy power generation system; the method further comprises the following steps: controlling the corresponding switch tubes in the conversion circuit to be closed so that the direct-current power supply and the corresponding switch tubes in the conversion circuit form a first current loop; wherein the first current loop passes through the first current sensor; determining whether the first current sensor has a failure fault according to the output value of the first current sensor; therefore, whether the first current sensor in the conversion device fails or not can be determined before the conversion device is connected to the grid, the failure range is prevented from being expanded, in addition, the first current sensor is subjected to failure detection under the condition that no circuit is added, the algorithm is simple, the realization is easy, and no risk exists.
Known from the existing patent, the scheme judges whether the first current sensor fails or not by means of the conduction work of a switching tube VT1 in a direct current side BOOST circuit (VT 1, VD1 and direct current line inductance form a BOOST circuit); and judging whether the second current sensor fails or not is realized by the full operation of the converter device. The implementation of the scheme depends on the specific circuit system structure, such as a BOOST circuit, but some converters do not have the BOOST circuit, so that the method is not applicable.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a failure detection method, medium and system for a current sensor of a current transformer, which are simple and convenient to operate, low in cost and sensitive in detection.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a failure detection method for a current sensor of a converter comprises the following steps:
s1, closing a distribution switch at the alternating current side of a converter to switch on an alternating current power grid load to carry out power output operation;
s2, acquiring a direct current value and a corresponding direct current voltage value of the direct current sensor at the direct current side of the converter to obtain direct current side power Pdc;
acquiring an alternating current value and a corresponding alternating voltage value of the alternating current sensor at the alternating current side of the converter to obtain alternating current side power Pac;
calculating a power deviation value delta P = | Pdc-Pac | between the direct current side power Pdc and the alternating current side power Pac;
s3, comparing the power deviation value delta P with a preset power deviation threshold value delta P1; when DeltaP > DeltaP1, judging that the current sensor has failure fault.
Preferably, the method further comprises the steps of:
1) Under the condition that the distribution switch on the alternating current side of the converter is switched off, a direct current power supply is switched on, so that the converter is operated off the grid;
2) Acquiring an alternating current value acquired by an alternating current sensor at the alternating current side of the converter, and comparing the alternating current value with a preset alternating current threshold value; when the alternating current value is not within a preset alternating current threshold value, judging that the alternating current sensor is invalid; otherwise, judging the AC current sensor to be normal;
wherein the above steps 1) -2) are performed after the steps S1-S3 are performed; in this case, if it is determined that the current sensor has a failure fault after performing steps S1-S3, and if it is determined that the ac current sensor is normal by performing steps 1) -2), it is determined that the dc current sensor has a failure;
or the above steps 1) -2) are carried out before the steps S1-S3 are carried out; in this case, if the steps 1) -2) are performed to determine that the ac current sensor is normal, and it is determined that the current sensor has a failure fault after the steps S1-S3 are performed, it is determined that the dc current sensor has a fault.
Preferably, the preset power deviation threshold value Δ P1 is obtained according to the system working condition loss and the current sensor precision.
Preferably, in step S2, a dc current value of the dc side dc current sensor of the converter is obtained at the same time, and if the dc current value at this time exceeds a certain value, it is determined that the dc current sensor is failed.
Preferably, the converter is an inverter.
Preferably, the converter is a rectifier.
Preferably, when the converter is a single-phase converter, the ac current sensor on the ac side is one.
Preferably, when the converter is a three-phase converter, three ac current sensors are provided on the ac side, and are located at each phase output terminal of the three-phase converter.
The invention also discloses a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, performs the steps of the method as described above.
The invention further discloses a converter current sensor failure detection system comprising a memory and a processor, the memory having stored thereon a computer program which, when executed by the processor, performs the steps of the method as described above.
Compared with the prior art, the invention has the advantages that:
the failure detection method only utilizes the control power distribution switch and the alternating current filter which are fixed and conventionally configured by the conversion device to control the operation mode of the converter, and utilizes the calculation of the absolute value of the input/output power deviation and the logic judgment of the converter to quickly judge the failure fault of the current sensor, and has the advantages of no dependence on other extra specific circuit topologies, simple algorithm and sensitive detection.
Drawings
Fig. 1 is a schematic circuit diagram of a main circuit of a three-phase converter conversion device according to the prior art.
FIG. 2 is a schematic diagram of prior art current sensor failure detection.
Fig. 3 is a schematic circuit diagram of a three-phase inverter according to an embodiment of the present invention.
FIG. 4 is a flowchart of an embodiment of a failure detection method of the present invention.
FIG. 5 is a second flowchart of the failure detection method according to the present invention.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
The embodiment of the three-phase inverter shown in fig. 3 is described as an example, but the failure detection method of the present invention is also applicable to a single-phase inverter and a rectifier. As shown in fig. 3, when the converter device is an inverter device, its dc input is a dc power input (photovoltaic, energy storage battery, etc.), and its ac output is an ac load (grid or load). The interior includes from the dc side to the ac side: the power conversion device comprises a direct current sensor BC1, a direct current bus capacitor, a power conversion unit, alternating current sensors BC2-BC4, an alternating current filter (filter inductor + filter capacitor) and a power distribution switch. It should be noted that: when a single-phase converter is used, the alternating-current side current sensor can be one, and the alternating-current filter is in a single-phase form.
Example one
As shown in fig. 4, the corresponding method for detecting failure of the current sensor of the converter specifically includes the following steps:
s1, closing a power distribution switch on the alternating current side of a converter to switch on an alternating current power grid load to carry out power output operation;
s2, acquiring a direct current value and a corresponding direct current voltage value of the direct current sensor at the direct current side of the converter to obtain direct current side power Pdc;
acquiring an alternating current value and a corresponding alternating voltage value of the alternating current sensor at the alternating current side of the converter to obtain alternating current side power Pac;
calculating a power deviation value delta P = | Pdc-Pac | between the direct current side power Pdc and the alternating current side power Pac;
s3, comparing the power deviation value delta P with a preset power deviation threshold value delta P1; when Δ P >. Δ P1, it is determined that there is a current sensor failure fault, such as a dc current sensor fault, or an ac current sensor fault, or a fault in both the dc current sensor and the ac current sensor. The preset power deviation threshold value delta P1 is obtained according to the system working condition loss and the sensor precision.
The failure detection method only utilizes the control power distribution switch and the alternating current filter which are fixed and conventionally configured by the conversion device to control the operation mode of the converter, and utilizes the calculation of the absolute value of the input/output power deviation and the logic judgment of the converter to quickly judge the failure fault of the current sensor, and has the advantages of no dependence on other extra specific circuit topologies, simple algorithm and sensitive detection.
The method corresponding to the embodiment is suitable for judging the sensor fault when the converter runs, namely the condition that the sensor fails in the running process.
Example two:
in this embodiment, the method further comprises the steps of:
1) Under the condition that a power distribution switch on the alternating current side of the converter is switched off, a direct current power supply is switched on, so that the converter runs off the grid; at this time, because the output of the inverter power conversion unit only forms a loop for the alternating current filter, the whole system only has reactive current of an alternating current filter capacitor in operation, the alternating current sensors (BC 2-BC 4) at the output side of the power conversion unit normally detect off-grid operation current, and the direct current side current sensor BC1 basically has no current (in a low current state, the detected no-load active loss);
2) Acquiring an alternating current value collected by an alternating current sensor ((BC 2-BC 4)) on the alternating current side of the converter, and comparing the alternating current value with a preset alternating current threshold value; when the alternating current value is not within the preset alternating current threshold value, judging that the alternating current sensor is invalid; otherwise, the AC current sensor is judged to be normal.
In this embodiment, the above steps 1) -2) are performed after the steps S1-S3 are performed; in this case, if it is determined that the current sensor has a failure fault after performing steps S1 to S3, and if it is determined that the ac current sensor is normal by performing steps 1) to 2), it may be determined that the dc current sensor has a fault.
Of course, in step S2, the dc current value of the dc-side dc current sensor of the converter may also be synchronously detected, the dc current value at this time is substantially zero under normal conditions, and if the dc current value is greater than a certain value, it may be determined that the dc current sensor is failed.
The invention firstly switches in input and output to normal operation to judge whether the current sensor fails or not, and then switches to the self-diagnosis mode (step 1) -2)) to judge whether the current sensor of the relevant loop fails or not, thereby determining which sensor has a fault.
The failure detection method only utilizes the conversion device to fix the conventionally configured control distribution switch and the AC filter to control the operation mode of the converter, compares the current value detected by each current sensor with the preset threshold value, quickly judges the failure fault of the current sensor, and has the advantages of no dependence on other extra specific circuit topologies (such as BOOST circuits), simple algorithm and sensitive detection.
Example three:
in the foregoing embodiment, in the case where the current sensor itself fails in the early stage, if the ac grid is connected or the load protection is not timely, the fault may be serious. Therefore, in the embodiment, the self-diagnosis operation is performed by controlling the alternating current distribution switch to be not closed, and the self-diagnosis current loop is formed through the alternating current filter, so that whether the alternating current side current sensors (BC 2, BC3 and BC 4) have failure conditions or not is judged; when no problem exists, the AC distribution switch is controlled to be closed to carry out on-load or grid-connected operation, whether the DC side current sensor fails or not is judged, and fault amplification can be reduced.
That is, steps 1) -2) are performed before steps S1-S3 are performed; in this case, if the steps 1) -2) are performed to determine that the ac current sensor is normal, and it is determined that the current sensor has a failure fault after the steps S1-S3 are performed, it is determined that the dc current sensor has a fault. And when the step 1) -2) is executed, the failure of the alternating current sensor is judged, and the step S1-S3 is not carried out, so that the fault caused by the access of the load or the grid-connected operation is avoided.
In the embodiment, the converter ac output side is not connected to an ac output load or a power grid to form a self-diagnosis loop, so as to determine whether the ac current sensor on the power converter ac side fails; if no fault exists, further direct current input and alternating current output are connected to form a normal operation loop, and whether the direct current sensor fails or not is judged by judging the absolute value of the input/output power deviation.
The above-described configuration is an ac-side self-diagnosis circuit formed in accordance with the input access and the output non-access, and actually, an ac-side self-diagnosis circuit may be formed in accordance with the input non-access and the output access. The above-described embodiments are explained with reference to an ac three-phase converter, and the present invention is also applicable to an ac single-phase converter.
The failure detection method of the invention does not depend on a specific BOOST circuit, and judges through the power value (current and voltage calculation) difference of a direct current end and an alternating current port, when the absolute value of the power deviation exceeds the normal error value of the system, the problem that the current sensor of the system has failure is judged. The universality is better without depending on a specific circuit.
The invention also discloses a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, performs the steps of the method as described above. The invention further discloses a converter current sensor failure detection system comprising a memory and a processor, the memory having stored thereon a computer program which, when executed by the processor, performs the steps of the method as described above. The medium and the system of the present invention correspond to the above control method, and also have the advantages as described above for the control method.
As used in this disclosure and in the claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are inclusive in the plural unless the context clearly dictates otherwise. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Likewise, the word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. A failure detection method for a current sensor of a converter is characterized by comprising the following steps:
s1, closing a distribution switch at the alternating current side of a converter to switch on an alternating current power grid load to carry out power output operation;
s2, acquiring a direct current value and a corresponding direct current voltage value of the direct current sensor at the direct current side of the converter to obtain direct current side power Pdc;
acquiring an alternating current value and a corresponding alternating voltage value of the alternating current sensor at the alternating current side of the converter to obtain alternating current side power Pac;
calculating a power deviation value delta P = | Pdc-Pac | between the direct current side power Pdc and the alternating current side power Pac;
s3, comparing the power deviation value delta P with a preset power deviation threshold value delta P1; when DeltaP > DeltaP1, judging that the current sensor has failure fault.
2. The converter current sensor failure detection method of claim 1, further comprising the steps of:
1) Under the condition that a power distribution switch on the alternating current side of the converter is switched off, a direct current power supply is switched on, so that the converter runs off the grid;
2) Acquiring an alternating current value acquired by an alternating current sensor at the alternating current side of the converter, and comparing the alternating current value with a preset alternating current threshold value; when the alternating current value is not within a preset alternating current threshold value, judging that the alternating current sensor is invalid; otherwise, judging the AC current sensor to be normal;
wherein the above steps 1) -2) are performed after the steps S1-S3 are performed; in this case, if it is determined that the current sensor has a failure fault after performing steps S1-S3, and if it is determined that the ac current sensor is normal by performing steps 1) -2), it is determined that the dc current sensor has a failure;
or the above steps 1) -2) are carried out before the steps S1-S3 are carried out; in this case, if the steps 1) -2) are performed to determine that the ac current sensor is normal, and it is determined that the current sensor has a failure fault after the steps S1-S3 are performed, it is determined that the dc current sensor has a fault.
3. The method for detecting the failure of the current sensor of the converter according to claim 1 or 2, wherein the preset power deviation threshold value Δ P1 is obtained according to the system working condition loss and the accuracy of the current sensor.
4. The method for detecting the failure of the converter current sensor according to claim 1 or 2, wherein in step S2, the dc current value of the converter dc side dc current sensor is obtained at the same time, and if the dc current value at this time exceeds a certain value, it is determined that the dc current sensor is failed.
5. The converter current sensor failure detection method of claim 1 or 2, wherein the converter is an inverter.
6. The converter current sensor failure detection method of claim 1 or 2, wherein the converter is a rectifier.
7. A converter current sensor failure detection method according to claim 1 or 2, characterized in that when the converter is a single-phase converter, there is one ac current sensor on the ac side.
8. A method for detecting failure of a current sensor of a current transformer according to claim 1 or 2, wherein, when the current transformer is a three-phase current transformer, three ac current sensors are provided on the ac side at the output terminals of each phase of the three-phase current transformer.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 8.
10. A converter current sensor failure detection system comprising a memory and a processor, the memory having stored thereon a computer program, characterized in that the computer program, when executed by the processor, performs the steps of the method according to any one of claims 1 to 8.
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| CN202211278052.6A CN115473414A (en) | 2022-10-19 | 2022-10-19 | Current transformer current sensor failure detection method, medium and system |
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| CN202211278052.6A CN115473414A (en) | 2022-10-19 | 2022-10-19 | Current transformer current sensor failure detection method, medium and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117452176A (en) * | 2023-12-25 | 2024-01-26 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Device power resistance test system, method and fixture |
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2022
- 2022-10-19 CN CN202211278052.6A patent/CN115473414A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117452176A (en) * | 2023-12-25 | 2024-01-26 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Device power resistance test system, method and fixture |
| CN117452176B (en) * | 2023-12-25 | 2024-04-02 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Device power resistance test system, method and fixture |
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