CN117370831A - Fault detection method for power distribution system comprising series reactors - Google Patents
Fault detection method for power distribution system comprising series reactors Download PDFInfo
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- CN117370831A CN117370831A CN202311150791.1A CN202311150791A CN117370831A CN 117370831 A CN117370831 A CN 117370831A CN 202311150791 A CN202311150791 A CN 202311150791A CN 117370831 A CN117370831 A CN 117370831A
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- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 12
- 230000002159 abnormal effect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
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- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a power distribution system fault detection method comprising series reactors, which comprises the following steps: step (1): collecting the current signal of the power distribution system and the working information of the reactor; step (2): performing preliminary judgment on the power distribution system according to the current signal; step (3): extracting effective work information of the reactor; step (4): calculating the effective value of the current of the power distribution system according to the effective work information of the reactor; step (5): and judging whether the power distribution system has faults or not according to the current effective value of the power distribution system. The invention provides a fault detection method for a power distribution system comprising series reactors, which can more accurately judge whether the power distribution system has faults.
Description
Technical Field
The invention belongs to the technical field of power detection, and particularly relates to a fault detection method for a power distribution system comprising series reactors.
Background
The power distribution system is a power network system which is composed of various power distribution equipment (or elements) and power distribution facilities, converts voltage and directly distributes electric energy to end users, and has important position in the power system because the power distribution system is directly oriented to the end users as the last link of the power system, and the safety and the reliability of the power distribution system are directly related to the reliability and the quality of electricity consumption of the vast users. Therefore, when the power distribution system is abnormal, the fault judgment of the power distribution system is fast and accurately carried out, and the fault judgment is an important measure for protecting the safe and stable operation of the power distribution system. The traditional method is to directly analyze and judge the current of the power distribution system, but if the accuracy of the collected current signal is not very high, the requirement of rapid fault judgment cannot be met.
The invention provides a fault detection method of a power distribution system comprising a series reactor, which calculates the effective value of the current of the power distribution system according to the work information of the power distribution system and the reactor, so as to judge whether the power distribution system has faults, improve the accuracy and the rapidity of fault judgment and prevent judgment errors caused by inaccurate current signals.
Disclosure of Invention
The invention provides a fault detection method for a power distribution system comprising series reactors, which can more accurately judge whether the power distribution system has faults.
The invention particularly relates to a power distribution system fault detection method comprising series reactors, which comprises the following steps:
step (1): collecting the current signal of the power distribution system and the working information of the reactor;
step (2): performing preliminary judgment on the power distribution system according to the current signal;
step (3): extracting effective work information of the reactor;
step (4): calculating the effective value of the current of the power distribution system according to the effective work information of the reactor;
step (5): and judging whether the power distribution system has faults or not according to the current effective value of the power distribution system.
The reactor operation information includes a reactor current signal and a reactor voltage signal.
The specific method for primarily judging the power distribution system according to the current signal comprises the following steps:
judging whether the current signal is in a current reference range, if not, the power distribution system has a fault;
if not, extracting the current signal of one sampling period, calculating the change rate of the current signal, judging whether the change rate of the current signal is larger than a current change rate reference value, and if so, judging that the power distribution system has faults; if not, further analysis and judgment are needed for the acquired signals.
The specific method for extracting the effective work information of the reactor comprises the following steps:
firstly, extracting the reactor current signal and the reactor voltage signal of one sampling period;
secondly, calculating the average value of the reactor current signal and the average value of the reactor voltage signal in one sampling period;
thirdly, judging whether the reactor current signal is in a reactor current reference range, if so, reserving the reactor current signal for use; if not, eliminating the corresponding reactor current signal;
judging whether the reactor voltage signal is in a reactor voltage reference range, if so, reserving the reactor voltage signal for use; if not, eliminating the corresponding reactor voltage signal;
and finally, recalculating the average value of the reactor current signal and the average value of the reactor voltage signal.
The specific algorithm for calculating the effective value of the current of the power distribution system according to the effective work information of the reactor is as follows:
wherein i is L For the average value of the reactor current signal, u L And f is the power distribution system frequency, and L is the reactor inductance.
The specific method for judging whether the power distribution system has faults or not according to the current effective value of the power distribution system comprises the following steps:
judging whether the current effective value is in the current reference range, if not, the power distribution system has faults;
if not, extracting the current effective value of one sampling period, calculating the current effective value change rate, judging whether the current effective value change rate is larger than a current change rate reference value, and if so, judging that the power distribution system has faults; if not, the power distribution system works normally.
Compared with the prior art, the beneficial effects are that: the power distribution system fault detection method comprises the steps of firstly collecting a power distribution system current signal to perform preliminary fault judgment on the power distribution system, then extracting effective reactor working information, calculating a power distribution system current effective value, further judging whether the power distribution system has faults or not, and improving the accuracy and the rapidity of fault judgment.
Drawings
Fig. 1 is a flowchart of a method of fault detection for a power distribution system including series reactors in accordance with the present invention.
Detailed Description
A specific embodiment of a fault detection method for a power distribution system including a series reactor according to the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the fault detection method of the power distribution system of the present invention comprises the steps of:
step (1): collecting the current signal of the power distribution system and the working information of the reactor, wherein the working information of the reactor comprises a current signal of the reactor and a voltage signal of the reactor;
step (2): and carrying out preliminary judgment on the power distribution system according to the current signal:
judging whether the current signal is in a current reference range, if not, the power distribution system has a fault;
if not, extracting the current signal of one sampling period, calculating the change rate of the current signal, judging whether the change rate of the current signal is larger than a current change rate reference value, and if so, judging that the power distribution system has faults; if not, further analysis and judgment are needed to be carried out on the acquired signals;
step (3): extracting effective work information of the reactor;
step (4): calculating the effective value of the current of the power distribution system according to the effective work information of the reactorWherein i is L For the average value of the reactor current signal, u L F is the power distribution system frequency, and L is the reactor inductance;
step (5): judging whether the power distribution system has faults according to the current effective value of the power distribution system:
judging whether the current effective value is in the current reference range, if not, the power distribution system has faults;
if not, extracting the current effective value of one sampling period, calculating the current effective value change rate, judging whether the current effective value change rate is larger than a current change rate reference value, and if so, judging that the power distribution system has faults; if not, the power distribution system works normally.
The specific method for extracting the effective work information of the reactor comprises the following steps:
firstly, extracting the reactor current signal and the reactor voltage signal of one sampling period;
secondly, calculating the average value of the reactor current signal and the average value of the reactor voltage signal in one sampling period;
thirdly, judging whether the reactor current signal is in a reactor current reference range, if so, reserving the reactor current signal for use; if not, eliminating the corresponding reactor current signal; taking the average value plus or minus 5% of the current signal of the reactor as the two end values of the current reference range of the reactor;
judging whether the reactor voltage signal is in a reactor voltage reference range, if so, reserving the reactor voltage signal for use; if not, eliminating the corresponding reactor voltage signal; taking the average value plus or minus 5% of the voltage signal of the reactor as the two end values of the voltage reference range of the reactor;
and finally, recalculating the average value of the reactor current signal and the average value of the reactor voltage signal.
Finally, it should be noted that the above-mentioned embodiments are merely illustrative of the technical solution of the invention and not limiting thereof. It will be understood by those skilled in the art that modifications and equivalents may be made to the particular embodiments of the invention, which are within the scope of the claims appended hereto.
Claims (6)
1. A power distribution system fault detection method comprising series reactors, the power distribution system fault detection method comprising the steps of:
step (1): collecting the current signal of the power distribution system and the working information of the reactor;
step (2): performing preliminary judgment on the power distribution system according to the current signal;
step (3): extracting effective work information of the reactor;
step (4): calculating the effective value of the current of the power distribution system according to the effective work information of the reactor;
step (5): and judging whether the power distribution system has faults or not according to the current effective value of the power distribution system.
2. A method of fault detection for a power distribution system including series reactors as claimed in claim 1, wherein said reactor operating information comprises a reactor current signal, a reactor voltage signal.
3. The method for detecting a fault in a power distribution system including series reactors according to claim 2, wherein the specific method for primarily determining the power distribution system according to the current signal is as follows:
judging whether the current signal is in a current reference range, if not, the power distribution system has a fault;
if not, extracting the current signal of one sampling period, calculating the change rate of the current signal, judging whether the change rate of the current signal is larger than a current change rate reference value, and if so, judging that the power distribution system has faults; if not, further analysis and judgment are needed for the acquired signals.
4. A power distribution system fault detection method comprising series reactors as claimed in claim 3, wherein the specific method for extracting valid operational information of said reactors comprises:
firstly, extracting the reactor current signal and the reactor voltage signal of one sampling period;
secondly, calculating the average value of the reactor current signal and the average value of the reactor voltage signal in one sampling period;
thirdly, judging whether the reactor current signal is in a reactor current reference range, if so, reserving the reactor current signal for use; if not, eliminating the corresponding reactor current signal;
judging whether the reactor voltage signal is in a reactor voltage reference range, if so, reserving the reactor voltage signal for use; if not, eliminating the corresponding reactor voltage signal;
and finally, recalculating the average value of the reactor current signal and the average value of the reactor voltage signal.
5. The method for detecting a fault in a power distribution system including series reactors as claimed in claim 4, wherein the specific algorithm for calculating the effective value of the current in the power distribution system according to the effective operation information of the reactors is as follows:
wherein i is L For the average value of the reactor current signal, u L And f is the power distribution system frequency, and L is the reactor inductance.
6. The method for detecting a fault in a power distribution system including series reactors as claimed in claim 5, wherein the specific method for judging whether the power distribution system has a fault according to the current effective value of the power distribution system is as follows:
judging whether the current effective value is in the current reference range, if not, the power distribution system has faults;
if not, extracting the current effective value of one sampling period, calculating the current effective value change rate, judging whether the current effective value change rate is larger than a current change rate reference value, and if so, judging that the power distribution system has faults; if not, the power distribution system works normally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311150791.1A CN117370831A (en) | 2023-09-07 | 2023-09-07 | Fault detection method for power distribution system comprising series reactors |
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| CN202311150791.1A CN117370831A (en) | 2023-09-07 | 2023-09-07 | Fault detection method for power distribution system comprising series reactors |
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| CN117370831A true CN117370831A (en) | 2024-01-09 |
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| CN202311150791.1A Pending CN117370831A (en) | 2023-09-07 | 2023-09-07 | Fault detection method for power distribution system comprising series reactors |
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2023
- 2023-09-07 CN CN202311150791.1A patent/CN117370831A/en active Pending
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