CN117335359A - Reactive compensation device protection system and method - Google Patents
Reactive compensation device protection system and method Download PDFInfo
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- CN117335359A CN117335359A CN202311088938.9A CN202311088938A CN117335359A CN 117335359 A CN117335359 A CN 117335359A CN 202311088938 A CN202311088938 A CN 202311088938A CN 117335359 A CN117335359 A CN 117335359A
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- 230000002159 abnormal effect Effects 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims description 22
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The application provides a reactive compensation device protection system and method, the protection system includes: the system comprises a first Hall current sensor, a first measuring level current sensor, a first protection level current sensor, a reactive compensation device and a controller; the controller obtains a first current, a second current and a third current detected by each current sensor; calculating a first difference value and a second difference value according to the acquired current, and calculating a difference value between the first difference value and a preset judgment value to obtain a third difference value; calculating a difference value between the second difference value and a preset judgment value to obtain a fourth difference value; when the third difference value and the fourth difference value are larger than or equal to zero, judging that the first Hall current sensor is abnormal; and when the third difference value or the fourth difference value is smaller than zero, judging that the first Hall current sensor is normal. The problem that the running state of the Hall current sensor cannot be judged is solved by detecting the state of the first Hall current sensor.
Description
Technical Field
The application relates to the technical field of power systems, in particular to a reactive power compensation device protection system and method.
Background
The reactive power compensation device controller adopts an actual current value to follow a current reference command value, and the difference value of the actual current value and the current reference command value is overlapped on a modulation wave after passing through the PI regulator to control the valve end voltage of the reactive power compensation device power valve group so as to generate an actual tracking current command.
The Hall current sensors adopted by the dual-system control are two different Hall current sensors, when the sampling of the Hall current sensors of the main system is not correct, the positive deviation between a current instruction and an actual current value is always caused, the reactive compensation device is used for adjusting the actual current value to follow a current reference instruction value, modulation waves are continuously reduced after an integration link is passed, the voltage of a valve end is reduced, the voltage drop on a reactor is increased, the overcurrent phenomenon occurs in the actual system, and finally overcurrent protection action is caused. Meanwhile, the abnormal monitoring logic for the current measurement in the no angle is easy to cause overvoltage and overcurrent protection tripping when the abnormal measurement such as broken wire of the Hall current sensor occurs in the operation.
Disclosure of Invention
The application provides a reactive compensation device protection system and a reactive compensation device protection method, which are used for solving the problem that the running state of a Hall current sensor cannot be judged.
In a first aspect, the present application provides a reactive compensation device protection system comprising: the system comprises a first Hall current sensor, a first measuring level current sensor, a first protection level current sensor, a reactive compensation device and a controller; the reactive power compensation device is connected with a three-phase bus, the first Hall current sensor, the first measuring level current sensor and the first protection level current sensor are connected with the controller, and the first Hall current sensor, the first measuring level current sensor and the first protection level current sensor are sequentially arranged between the reactive power compensation device and the three-phase bus;
the controller is used for:
acquiring a first current detected by the first Hall current sensor;
acquiring a second current detected by the first measurement level current sensor;
acquiring a third current detected by the first protection level current sensor;
calculating a first difference value and a second difference value, wherein the first difference value is the absolute value of the difference value of the first current and the second current; the second difference value is the absolute value of the difference value between the first current and the third current;
calculating the difference value between the first difference value and a preset judgment value to obtain a third difference value;
calculating the difference between the second difference and the preset judgment value to obtain a fourth difference;
when the third difference value and the fourth difference value are larger than or equal to zero, judging that the first Hall current sensor is abnormal;
and when the third difference value or the fourth difference value is smaller than zero, judging that the first Hall current sensor is normal.
Optionally, the number of the first hall current sensor, the first measurement stage current sensor and the first protection stage current sensor is three;
the three-phase bus comprises an A-phase bus, a B-phase bus and a C-phase bus; the reactive power compensation device is respectively connected with an A-phase bus, a B-phase bus and a C-phase bus;
the three first Hall current sensors are respectively arranged between the reactive power compensation device and the A-phase bus, between the reactive power compensation device and the B-phase bus and between the reactive power compensation device and the C-phase bus;
the three first measuring-stage current sensors are respectively arranged between the reactive power compensation device and the A-phase bus, between the reactive power compensation device and the B-phase bus and between the reactive power compensation device and the C-phase bus;
the three first protection-level current sensors are respectively arranged between the reactive compensation device and the A-phase bus, between the reactive compensation device and the B-phase bus and between the reactive compensation device and the C-phase bus.
Optionally, the first current, the second current and the third current are all AB phase currents;
or the first current, the second current and the third current are all BC phase currents;
or the first current, the second current and the third current are all CA phase currents.
Optionally, the device further comprises a second Hall current sensor, a second measuring stage current sensor and a second protection stage current sensor; the second Hall current sensor, the second measuring stage current sensor and the second protection stage current sensor are connected with the controller, and the second Hall current sensor, the second measuring stage current sensor and the second protection stage current sensor are sequentially arranged between the reactive compensation device and the three-phase bus;
the controller is further configured to: when the first Hall current sensor is judged to be abnormal, acquiring a fourth current detected by the second Hall current sensor;
acquiring a fifth current detected by the second measuring-stage current sensor;
obtaining a sixth current detected by the second protection-stage current sensor;
calculating a fifth difference value and a sixth difference value, wherein the fifth difference value is the absolute value of the difference value of the fourth current and the fifth current; the sixth difference is the absolute value of the difference between the fourth current and the sixth current;
calculating the difference between the fifth difference and the preset judgment value to obtain a seventh difference;
calculating the difference between the sixth difference and the preset judgment value to obtain an eighth difference;
when the seventh difference value and the eighth difference value are both larger than or equal to zero, judging that the second Hall current sensor is abnormal;
and when the seventh difference value or the eighth difference value is smaller than zero, judging that the second Hall current sensor is normal.
Optionally, the measuring ranges of the first hall current sensor and the second hall current sensor are the same, and the precision is the same; the first measuring stage current sensor and the second measuring stage current sensor have the same measuring range and the same precision; the first protection stage current sensor and the second protection stage current sensor have the same measuring range and the same precision.
In a second aspect, the present application provides a protection method for a reactive compensation device, which is applied to the protection system for a reactive compensation device, and the protection method includes:
acquiring a first current detected by a first Hall current sensor;
acquiring a second current detected by a first measurement level current sensor;
acquiring a third current detected by a first protection level current sensor;
calculating a first difference value and a second difference value, wherein the first difference value is the absolute value of the difference value of the first current and the second current; the second difference value is the absolute value of the difference value between the first current and the third current;
calculating the difference value between the first difference value and a preset judgment value to obtain a third difference value;
calculating the difference between the second difference and the preset judgment value to obtain a fourth difference;
when the third difference value and the fourth difference value are larger than or equal to zero, judging that the first Hall current sensor is abnormal;
and when the third difference value or the fourth difference value is smaller than zero, judging that the first Hall current sensor is normal.
Optionally, the method further comprises: when the first Hall current sensor is judged to be abnormal, acquiring a fourth current detected by a second Hall current sensor;
obtaining a fifth current detected by a second measuring-stage current sensor;
obtaining a sixth current detected by a second protection level current sensor;
calculating a fifth difference value and a sixth difference value, wherein the fifth difference value is the absolute value of the difference value of the fourth current and the fifth current; the sixth difference is the absolute value of the difference between the fourth current and the sixth current;
calculating the difference between the fifth difference and the preset judgment value to obtain a seventh difference;
calculating the difference between the sixth difference and the preset judgment value to obtain an eighth difference;
when the seventh difference value and the eighth difference value are both larger than or equal to zero, judging that the second Hall current sensor is abnormal;
and when the seventh difference value or the eighth difference value is smaller than zero, judging that the second Hall current sensor is normal.
According to the technical scheme, the application provides a reactive compensation device protection system and a reactive compensation device protection method, wherein the protection system comprises: the system comprises a first Hall current sensor, a first measuring level current sensor, a first protection level current sensor, a reactive compensation device and a controller; the controller obtains a first current, a second current and a third current detected by each current sensor; calculating a first difference value and a second difference value according to the acquired current, and calculating the difference value between the first difference value and a preset judgment value to obtain a third difference value; calculating the difference value between the second difference value and a preset judgment value to obtain a fourth difference value; when the third difference value and the fourth difference value are larger than or equal to zero, judging that the first Hall current sensor is abnormal; and when the third difference value or the fourth difference value is smaller than zero, judging that the first Hall current sensor is normal. The problem that the running state of the Hall current sensor cannot be judged is solved by detecting the state of the first Hall current sensor.
Drawings
For a clearer description of the technical method of the present application, the drawings that are required to be used in the embodiments will be briefly described, and it will be apparent to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a protection system of a reactive compensation device according to an embodiment of the present application;
fig. 2 is a logic diagram one of a reactive compensation device protection system according to an embodiment of the present application;
fig. 3 is a logic diagram two of a reactive compensation device protection system according to an embodiment of the present application;
fig. 4 is a flowchart of a protection method of a reactive compensation device according to an embodiment of the present application;
fig. 5 is a flowchart second of a protection method of a reactive compensation device according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the present application. Merely as examples of systems and methods consistent with some aspects of the present application as detailed in the claims.
The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may include at least one, i.e. one or more, of the feature explicitly or implicitly.
The reactive power compensation device can improve the power factors of a power supply system and a load, the transmitted reactive power is reduced after the reactive power compensation device is installed, and the power factor is improved under the condition that the transmitted active power is unchanged. When the current sampling value of the control system of the reactive compensation device is not equal, the power of the control system is not adjusted, the actual system is in an overcurrent phenomenon, and finally the overcurrent protection action problem is caused. The control system current sampling value is obtained through detection of the Hall current sensor, so that the operation state of the Hall current sensor cannot be judged, and whether the control system current sampling value is correct cannot be determined.
In order to solve the problem that the operation state of the hall current sensor cannot be determined, referring to fig. 1 and fig. 2, some embodiments of the present application provide a protection system for a reactive compensation device, including: the system comprises a first Hall current sensor, a first measuring level current sensor, a first protection level current sensor, a reactive compensation device and a controller; the reactive power compensation device is connected with the three-phase bus, the first Hall current sensor, the first measuring level current sensor and the first protection level current sensor are connected with the controller, and the first Hall current sensor, the first measuring level current sensor and the first protection level current sensor are sequentially arranged between the reactive power compensation device and the three-phase bus.
The controller is used for: acquiring a first current detected by a first Hall current sensor; acquiring a second current detected by a first measurement level current sensor; acquiring a third current detected by a first protection level current sensor; calculating a first difference value and a second difference value, wherein the first difference value is the absolute value of the difference value of the first current and the second current; the second difference value is the absolute value of the difference value of the first current and the third current; calculating a difference value between the first difference value and a preset judgment value to obtain a third difference value; calculating a difference value between the second difference value and a preset judgment value to obtain a fourth difference value; when the third difference value and the fourth difference value are larger than or equal to zero, judging that the first Hall current sensor is abnormal; and when the third difference value or the fourth difference value is smaller than zero, judging that the first Hall current sensor is normal.
Detecting three-phase bus current through a first Hall current sensor, a first measuring level current sensor and a first protection level current sensor, calculating to obtain a first difference value and a second difference value, then making the first difference value and the second difference value with a preset judgment value to obtain a third difference value and a fourth difference value, judging the state of the first Hall current sensor through the third difference value and the fourth difference value, and when the third difference value and the fourth difference value are both larger than or equal to zero, indicating that the first Hall current sensor is abnormal, wherein the current value detected by the first Hall current sensor has deviation from a current reference instruction value. When any one of the third difference value and the fourth difference value is smaller than zero, the first Hall current sensor is normal, and the current value detected by the first Hall current sensor can control the valve end voltage of the reactive compensation device. Through setting up reactive power compensator protection system, judge hall current sensor running state in real time to solve hall current sensor and sample inaccurate problem.
In some embodiments, the number of first hall current sensors, first measurement stage current sensors, and first protection stage current sensors are all three; the three-phase bus comprises an A-phase bus, a B-phase bus and a C-phase bus; the reactive power compensation device is respectively connected with the A-phase bus, the B-phase bus and the C-phase bus; the three first Hall current sensors are respectively arranged between the reactive power compensation device and the A-phase bus, between the reactive power compensation device and the B-phase bus and between the reactive power compensation device and the C-phase bus; the three first measuring-stage current sensors are respectively arranged between the reactive power compensation device and the A-phase bus, between the reactive power compensation device and the B-phase bus and between the reactive power compensation device and the C-phase bus; three first protection level current sensors are respectively arranged between the reactive power compensation device and the A-phase bus, between the reactive power compensation device and the B-phase bus and between the reactive power compensation device and the C-phase bus.
It can be understood that the reactive power compensation device is connected with the A phase bus, the B phase bus and the C phase bus respectively, a first Hall current sensor, a first measuring level current sensor and a first protection level current sensor are arranged between the A phase bus and the reactive power compensation device, a first Hall current sensor, a first measuring level current sensor and a first protection level current sensor are arranged between the B phase bus and the reactive power compensation device, a first Hall current sensor, a first measuring level current sensor and a first protection level current sensor are arranged between the C phase bus and the reactive power compensation device, and the current of each phase of the three-phase bus can be monitored in real time by arranging three groups of first Hall current sensors, the first measuring level current sensor and the first protection level current sensor, so that the measurement result is more accurate.
In some embodiments, the first current, the second current, and the third current are all AB phase currents; or the first current, the second current and the third current are BC phase currents; or the first current, the second current and the third current are all CA phase currents. The reactive compensation device is connected with the three-phase bus by adopting a triangle connection method, when the AB phase current is a positive half period, the first current, the second current and the third current which are acquired by the controller are all AB phase currents, when the BC phase current is a positive half period, the first current, the second current and the third current which are acquired by the controller are all BC phase currents, when the CA phase current is a positive half period, the first current, the second current and the third current which are acquired by the controller are all CA phase currents, and by detecting the same phase current, the working state of the first Hall current sensor can be analyzed more accurately according to the detected data.
In some embodiments, as shown in fig. 1 and 3, the reactive compensation device protection system further includes a second hall current sensor, a second measurement stage current sensor, and a second protection stage current sensor; the second Hall current sensor, the second measuring stage current sensor and the second protection stage current sensor are connected with the controller, and the second Hall current sensor, the second measuring stage current sensor and the second protection stage current sensor are sequentially arranged between the reactive compensation device and the three-phase bus.
The controller is further configured to: when the first Hall current sensor is judged to be abnormal, acquiring a fourth current detected by the second Hall current sensor; obtaining a fifth current detected by a second measuring-stage current sensor; obtaining a sixth current detected by a second protection level current sensor; calculating a fifth difference value and a sixth difference value, wherein the fifth difference value is the absolute value of the difference value of the fourth current and the fifth current; the sixth difference is the absolute value of the difference between the fourth current and the sixth current; calculating a difference value between the fifth difference value and a preset judgment value to obtain a seventh difference value; calculating a difference value between the sixth difference value and a preset judgment value to obtain an eighth difference value; when the seventh difference value and the eighth difference value are larger than or equal to zero, judging that the second Hall current sensor is abnormal; and when the seventh difference value or the eighth difference value is smaller than zero, judging that the second Hall current sensor is normal.
Through setting up second hall current sensor, second measurement level current sensor and second protection level current sensor, after first hall current sensor is unusual, the controller can collect second hall current sensor, second measurement level current sensor and second protection level current sensor's current value as reactive compensation device's current sampling value, reduces first hall current sensor after unusual, leads to the overcurrent protection action to appear.
In some embodiments, the first hall current sensor and the second hall current sensor have the same measuring range and the same precision; the first measuring stage current sensor and the second measuring stage current sensor have the same measuring range and the same precision; the first protection level current sensor and the second protection level current sensor have the same measuring range and the same precision.
It can be understood that, when in use, the first hall current sensor, the first measurement stage current sensor, the first protection stage current sensor, the second hall current sensor, the second measurement stage current sensor and the second protection stage current sensor all detect currents in real time, but the controller will first take the current values detected by the first hall current sensor, the first measurement stage current sensor and the first protection stage current sensor as the current sampling values of the reactive compensation device, and when the controller determines that the first hall current sensor is abnormal, the controller uses the currents detected by the second hall current sensor, the second measurement stage current sensor and the second protection stage current sensor as the current sampling values of the reactive compensation device.
The measuring range of the first Hall current sensor is the same as that of the second Hall current sensor, and the precision is the same; the first measuring stage current sensor and the second measuring stage current sensor have the same measuring range and the same precision; the first protection level current sensor and the second protection level current sensor have the same measuring range and the same precision, and can use the standby second Hall current sensor to detect current when the first Hall current sensor is abnormal, so that protection misoperation and power misoperation caused by abnormal current sampling are reduced.
In some embodiments, as shown in fig. 4, some embodiments of the present application further provide a reactive compensation device protection method, including:
and acquiring a first current detected by a first Hall current sensor.
A second current detected by the first measurement stage current sensor is obtained.
And acquiring a third current detected by the first protection level current sensor.
Calculating a first difference value and a second difference value, wherein the first difference value is the absolute value of the difference value of the first current and the second current; the second difference is the absolute value of the difference between the first current and the third current.
And calculating the difference value between the first difference value and the preset judgment value to obtain a third difference value.
And calculating the difference value between the second difference value and the preset judgment value to obtain a fourth difference value.
And when the third difference value and the fourth difference value are larger than or equal to zero, judging that the first Hall current sensor is abnormal.
And when the third difference value or the fourth difference value is smaller than zero, judging that the first Hall current sensor is normal.
As shown in fig. 5, the protection method of the reactive compensation device further includes:
and when the first Hall current sensor is judged to be abnormal, acquiring a fourth current detected by the second Hall current sensor.
A fifth current detected by the second measurement stage current sensor is obtained.
And acquiring a sixth current detected by the second protection-stage current sensor.
Calculating a fifth difference value and a sixth difference value, wherein the fifth difference value is the absolute value of the difference value of the fourth current and the fifth current; the sixth difference is the absolute value of the difference between the fourth current and the sixth current.
And calculating a difference value between the fifth difference value and a preset judgment value to obtain a seventh difference value.
And calculating a difference value between the sixth difference value and a preset judgment value to obtain an eighth difference value.
And when the seventh difference value and the eighth difference value are larger than or equal to zero, judging that the second Hall current sensor is abnormal.
And when the seventh difference value or the eighth difference value is smaller than zero, judging that the second Hall current sensor is normal.
According to the technical scheme, the embodiment of the application provides a reactive compensation device protection system and a reactive compensation device protection method, wherein the protection system comprises: the system comprises a first Hall current sensor, a first measuring level current sensor, a first protection level current sensor, a reactive compensation device and a controller; the controller obtains a first current, a second current and a third current detected by each current sensor; calculating a first difference value and a second difference value according to the acquired current, and calculating a difference value between the first difference value and a preset judgment value to obtain a third difference value; calculating a difference value between the second difference value and a preset judgment value to obtain a fourth difference value; when the third difference value and the fourth difference value are larger than or equal to zero, judging that the first Hall current sensor is abnormal; and when the third difference value or the fourth difference value is smaller than zero, judging that the first Hall current sensor is normal. The problem that the running state of the Hall current sensor cannot be judged is solved by detecting the state of the first Hall current sensor.
The foregoing detailed description of the embodiments is merely illustrative of the general principles of the present application and should not be taken in any way as limiting the scope of the invention. Any other embodiments developed in accordance with the present application without inventive effort are within the scope of the present application for those skilled in the art.
Claims (7)
1. A reactive compensation device protection system, comprising: the system comprises a first Hall current sensor, a first measuring level current sensor, a first protection level current sensor, a reactive compensation device and a controller; the reactive power compensation device is connected with a three-phase bus, the first Hall current sensor, the first measuring level current sensor and the first protection level current sensor are connected with the controller, and the first Hall current sensor, the first measuring level current sensor and the first protection level current sensor are sequentially arranged between the reactive power compensation device and the three-phase bus;
the controller is used for:
acquiring a first current detected by the first Hall current sensor;
acquiring a second current detected by the first measurement level current sensor;
acquiring a third current detected by the first protection level current sensor;
calculating a first difference value and a second difference value, wherein the first difference value is the absolute value of the difference value of the first current and the second current; the second difference value is the absolute value of the difference value between the first current and the third current;
calculating the difference value between the first difference value and a preset judgment value to obtain a third difference value;
calculating the difference between the second difference and the preset judgment value to obtain a fourth difference;
when the third difference value and the fourth difference value are larger than or equal to zero, judging that the first Hall current sensor is abnormal;
and when the third difference value or the fourth difference value is smaller than zero, judging that the first Hall current sensor is normal.
2. The reactive compensation device protection system of claim 1, wherein the number of the first hall current sensors, the first measurement stage current sensors, and the first protection stage current sensors are three;
the three-phase bus comprises an A-phase bus, a B-phase bus and a C-phase bus; the reactive power compensation device is respectively connected with an A-phase bus, a B-phase bus and a C-phase bus;
the three first Hall current sensors are respectively arranged between the reactive power compensation device and the A-phase bus, between the reactive power compensation device and the B-phase bus and between the reactive power compensation device and the C-phase bus;
the three first measuring-stage current sensors are respectively arranged between the reactive power compensation device and the A-phase bus, between the reactive power compensation device and the B-phase bus and between the reactive power compensation device and the C-phase bus;
the three first protection-level current sensors are respectively arranged between the reactive compensation device and the A-phase bus, between the reactive compensation device and the B-phase bus and between the reactive compensation device and the C-phase bus.
3. The reactive compensation device protection system of claim 1, wherein the first current, the second current, and the third current are all AB phase currents;
or the first current, the second current and the third current are all BC phase currents;
or the first current, the second current and the third current are all CA phase currents.
4. The reactive compensation device protection system of claim 1, further comprising a second hall current sensor, a second measurement stage current sensor, and a second protection stage current sensor; the second Hall current sensor, the second measuring stage current sensor and the second protection stage current sensor are connected with the controller, and the second Hall current sensor, the second measuring stage current sensor and the second protection stage current sensor are sequentially arranged between the reactive compensation device and the three-phase bus;
the controller is further configured to: when the first Hall current sensor is judged to be abnormal, acquiring a fourth current detected by the second Hall current sensor;
acquiring a fifth current detected by the second measuring-stage current sensor;
obtaining a sixth current detected by the second protection-stage current sensor;
calculating a fifth difference value and a sixth difference value, wherein the fifth difference value is the absolute value of the difference value of the fourth current and the fifth current; the sixth difference is the absolute value of the difference between the fourth current and the sixth current;
calculating the difference between the fifth difference and the preset judgment value to obtain a seventh difference;
calculating the difference between the sixth difference and the preset judgment value to obtain an eighth difference;
when the seventh difference value and the eighth difference value are both larger than or equal to zero, judging that the second Hall current sensor is abnormal;
and when the seventh difference value or the eighth difference value is smaller than zero, judging that the second Hall current sensor is normal.
5. The reactive compensation device protection system of claim 4, wherein the first hall current sensor and the second hall current sensor have the same measurement range and the same precision; the first measuring stage current sensor and the second measuring stage current sensor have the same measuring range and the same precision; the first protection stage current sensor and the second protection stage current sensor have the same measuring range and the same precision.
6. A reactive power compensator protection method, characterized by being applied to the reactive power compensator protection system of any one of claims 1-5, comprising:
acquiring a first current detected by a first Hall current sensor;
acquiring a second current detected by a first measurement level current sensor;
acquiring a third current detected by a first protection level current sensor;
calculating a first difference value and a second difference value, wherein the first difference value is the absolute value of the difference value of the first current and the second current; the second difference value is the absolute value of the difference value between the first current and the third current;
calculating the difference value between the first difference value and a preset judgment value to obtain a third difference value;
calculating the difference between the second difference and the preset judgment value to obtain a fourth difference;
when the third difference value and the fourth difference value are larger than or equal to zero, judging that the first Hall current sensor is abnormal;
and when the third difference value or the fourth difference value is smaller than zero, judging that the first Hall current sensor is normal.
7. The reactive compensation device protection method of claim 6, further comprising:
when the first Hall current sensor is judged to be abnormal, acquiring a fourth current detected by a second Hall current sensor;
obtaining a fifth current detected by a second measuring-stage current sensor;
obtaining a sixth current detected by a second protection level current sensor;
calculating a fifth difference value and a sixth difference value, wherein the fifth difference value is the absolute value of the difference value of the fourth current and the fifth current; the sixth difference is the absolute value of the difference between the fourth current and the sixth current;
calculating the difference between the fifth difference and the preset judgment value to obtain a seventh difference;
calculating the difference between the sixth difference and the preset judgment value to obtain an eighth difference;
when the seventh difference value and the eighth difference value are both larger than or equal to zero, judging that the second Hall current sensor is abnormal;
and when the seventh difference value or the eighth difference value is smaller than zero, judging that the second Hall current sensor is normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311088938.9A CN117335359A (en) | 2023-08-28 | 2023-08-28 | Reactive compensation device protection system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311088938.9A CN117335359A (en) | 2023-08-28 | 2023-08-28 | Reactive compensation device protection system and method |
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| CN117335359A true CN117335359A (en) | 2024-01-02 |
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| CN202311088938.9A Pending CN117335359A (en) | 2023-08-28 | 2023-08-28 | Reactive compensation device protection system and method |
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- 2023-08-28 CN CN202311088938.9A patent/CN117335359A/en active Pending
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