CN116027098A - Leakage current detection method suitable for flexible direct current comprehensive voltage regulating device - Google Patents
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Abstract
The invention relates to the field of leakage current detection, and discloses a leakage current detection method suitable for a flexible direct current comprehensive voltage regulating device, wherein the device comprises a rectifying device and an inversion device; the rectifying device and the inverting device are respectively connected in parallel to the power grid, and are connected through positive and negative direct current buses. The method comprises the following steps: collecting current data of a rectifying side bus and an inverting side bus in real time; digitally filtering the collected current data; encoding the filtered current data; the inversion device transmits inversion side coded data to the rectifying device; after receiving the inversion side coded data, the rectifying device is combined to judge leakage current. The method has the advantages that the current data of the bus on the rectifying side and the bus on the inverting side are collected in real time, the collected current data are subjected to digital filtering and encoding processing, the inverting side transmits the data after encoding data to the rectifying side, the rectifying side receives the data to realize leakage current judgment, the method is good in real time, high in detection precision and significant in ensuring the distribution and utilization safety.
Description
Technical Field
The invention relates to the field of leakage current detection, in particular to a leakage current detection method suitable for a flexible direct current comprehensive voltage regulating device.
Background
Part of rural distribution network has weak structure, and end users have the problem of light Fu Gao voltage and low voltage. The flexible DC comprehensive voltage regulating device is one equipment for high and low voltage treatment of low voltage distribution network system. The equipment consists of a rectifying device and an inversion device, which are respectively arranged at the front end and the tail end of a circuit, the circuit between the rectifying device and the inversion device adopts direct current transmission, and the equipment is connected in parallel to operate in a power grid.
Because the flexible direct current comprehensive voltage regulating device has an independent power transmission line and high rated voltage, if a grounding or electric shock accident occurs, a large potential safety hazard can be caused. Therefore, the leakage current detection is carried out on the direct current transmission line of the flexible direct current comprehensive voltage regulating device, the transmission state of the direct current transmission line is monitored in real time, and the method has important significance for ensuring the distribution and utilization safety. In view of this problem, no practical solution has yet emerged in the industry.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a leakage current detection method suitable for a flexible direct current comprehensive voltage regulating device, and the leakage current detection is realized by collecting current data of a rectifying side bus and an inversion side bus in real time, and performing filtering encoding on the data and then performing double-end communication.
The aim of the invention can be achieved by the following technical scheme:
the leakage current detection method suitable for the flexible direct current comprehensive voltage regulating device is characterized in that the flexible direct current comprehensive voltage regulating device comprises a rectifying device and an inversion device;
the rectifying device and the inverting device are respectively connected in parallel to the power grid and are connected through positive and negative direct current buses;
the method comprises the following steps:
step 1: the rectifying device and the inversion device respectively acquire positive and negative current data of a rectifying side direct current bus and an inversion side direct current bus in real time;
step 2: the rectifying device and the inverting device respectively carry out digital filtering on the collected current data;
step 3: the rectifying device and the inverting device respectively encode the digitally filtered current data; taking data with the length of T milliseconds as a time window, and calculating the average value of the data in the time window, wherein each average value is taken as 1 code bit;
step 4: the inversion device transmits inversion side coded data to the rectifying device;
step 5: after receiving the inversion side coded data, the rectifying device is combined to judge leakage current.
Further, in the step 2, a low-pass filter is used for digital filtering.
Further, the leakage current judging method in the step 5 is as follows: comparing the difference result of the rectifying side coded data and the inverting side coded data with a threshold value, and if the difference result of n continuous time windows exceeds the threshold value, considering that leakage current exists and leakage accidents occur.
The beneficial technical effects of the invention are as follows: the method has the advantages that current data of the bus on the rectifying side and the bus on the inverting side are collected in real time, the collected current data are subjected to digital filtering and encoding processing, the inverting side transmits the encoded data to the rectifying side, the rectifying side receives the data to realize leakage current judgment, the method is good in instantaneity and high in detection precision, and the method has important significance for ensuring power distribution and utilization safety.
Drawings
Fig. 1 is a block diagram of the components and connections of the flexible dc voltage regulator assembly of the present invention.
Fig. 2 is a schematic diagram of the sum of current flowing through the rectifying side bus of the integrated voltage regulator device in accordance with an embodiment of the present invention.
Fig. 3 is a schematic diagram of the sum of currents of the inverter-side bus of the flexible dc voltage regulator in an embodiment of the invention.
Fig. 4 is a digital filtering result of the sum of currents of rectifying side buses of the flexible direct current integrated voltage regulator device in the embodiment of the invention.
Fig. 5 is a digital filtering result of the sum of currents of the inversion side bus of the flexible direct current integrated voltage regulator in the embodiment of the present invention.
Fig. 6 is a general flow chart of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Examples:
a leakage current detection method suitable for a flexible direct current comprehensive voltage regulating device comprises a rectifying device and an inversion device.
The rectifying device and the inverting device are respectively connected in parallel to A, B, C, N lines of the power grid, the rectifying device and the inverting device are connected through positive and negative direct current buses, and the composition and connection block diagram of the flexible direct current comprehensive voltage regulating device are shown in figure 1.
As shown in fig. 6, the method comprises the steps of:
step 1: current data of the rectifying side bus and the inverting side bus are collected in real time, the sum of the current of the rectifying side bus and the sum of the current of the inverting side bus are shown in fig. 2, and the sum of the current of the inverting side bus are shown in fig. 3.
Step 2: the collected current data is digitally filtered using a low pass filter, the digital filtering result of the current sum of the rectifying side bus bar is shown in fig. 4, and the digital filtering result of the current sum of the inverting side bus bar is shown in fig. 5.
Step 3: the filtered current data is coded, namely, the data with the length of 10 milliseconds is taken as a time window, the average value of the data in the time window is calculated, and each average value is taken as 1 code bit:
the rectifying side code bit is obtained as follows: -1.58, 0.87, -1.28, 1.50, -1.32, 1.24, -1.71, 0.37, -0.73;
the inversion side code bit is obtained as follows: -1.58, 0.87, -1.28, 1.50, -1.06, 1.63, -1.37, 0.76, -0.38.
Step 4: the inverter transmits the inverter-side encoded data to the rectifier.
Step 5: after receiving the inversion side coded data, the rectifying device is combined to judge leakage current. Subtracting the rectifying side encoded data from the inverting side encoded data to obtain 0, 0.26, 0.39, 0.34, 0.39, 0.35; the difference result of the continuous 5 time windows exceeds the threshold value of 0.1, and the leakage current is considered to exist, so that the leakage accident occurs.
The above embodiments are illustrative of the specific embodiments of the present invention, and not restrictive, and various changes and modifications may be made by those skilled in the relevant art without departing from the spirit and scope of the invention, so that all such equivalent embodiments are intended to be within the scope of the invention.
Claims (3)
1. The leakage current detection method suitable for the flexible direct current comprehensive voltage regulating device is characterized in that the flexible direct current comprehensive voltage regulating device comprises a rectifying device and an inversion device;
the rectifying device and the inverting device are respectively connected in parallel to the power grid and are connected through positive and negative direct current buses;
the method comprises the following steps:
step 1: the rectifying device and the inversion device respectively acquire positive and negative current data of a rectifying side direct current bus and an inversion side direct current bus in real time;
step 2: the rectifying device and the inverting device respectively carry out digital filtering on the collected current data;
step 3: the rectifying device and the inverting device respectively encode the digitally filtered current data; taking data with the length of T milliseconds as a time window, and calculating the average value of the data in the time window, wherein each average value is taken as 1 code bit;
step 4: the inversion device transmits inversion side coded data to the rectifying device;
step 5: after receiving the inversion side coded data, the rectifying device is combined to judge leakage current.
2. The leakage current detection method for a flexible dc voltage regulator according to claim 1, wherein the step 2 uses a low-pass filter for digital filtering.
3. The leakage current detection method for the flexible dc voltage regulator as claimed in claim 1, wherein the leakage current determination method in step 5 is as follows: comparing the difference result of the rectifying side coded data and the inverting side coded data with a threshold value, and if the difference result of n continuous time windows exceeds the threshold value, considering that leakage current exists and leakage accidents occur.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116660793A (en) * | 2023-07-25 | 2023-08-29 | 青岛鼎信通讯股份有限公司 | AC/DC leakage detection method based on flexible DC voltage regulating device |
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Application publication date: 20230428 |