CN110794210A - Method and device for judging voltage harmonic isolation effect, power supply system, computer equipment and storage medium - Google Patents
Method and device for judging voltage harmonic isolation effect, power supply system, computer equipment and storage medium Download PDFInfo
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Abstract
The application relates to a method and a device for judging voltage harmonic isolation effect, computer equipment and a computer readable storage medium, wherein the method for judging the voltage harmonic isolation effect comprises the following steps: selecting monitoring nodes of a power supply intermediate link in a power supply system, wherein the monitoring nodes comprise power supply points and power receiving points; collecting first voltage harmonic data of the power supply point and second voltage harmonic data of the power receiving point in the monitoring node; calculating to obtain a voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data; and judging the isolation effect of the power supply intermediate link on the voltage harmonic based on the voltage harmonic isolation ratio. According to the method for judging the voltage harmonic isolation effect, the appropriate monitoring node is selected from the power supply system, and the voltage harmonic data is collected at the monitoring node to be calculated to obtain the voltage harmonic isolation ratio, so that the isolation effect of the power supply intermediate link on the voltage harmonic is quantitatively judged.
Description
Technical Field
The invention relates to the technical field of harmonic monitoring, in particular to a method and a device for judging voltage harmonic isolation effect, a power supply system, computer equipment and a computer readable storage medium.
Background
With the development of power electronic technology, a large amount of nonlinear loads are connected into a power system, so that a large amount of harmonic voltage enters a power grid, and the whole power supply environment is full of complex voltage harmonics under the condition of superposition with power supply harmonics of an alternating current system. The pollution of harmonic voltage to the power grid can bring the problems of reduced electric energy transmission efficiency, accelerated insulation aging and the like, so more and more harmonic treatment equipment is installed in a power supply system, and a power supply intermediate link can isolate voltage harmonic.
The traditional evaluation indexes of voltage harmonic isolation generally describe the voltage harmonic content of harmonic size, or the total harmonic distortion rate evaluated from the overall distortion degree of voltage waveform, are specific to the characteristics of voltage harmonics, cannot accurately evaluate the voltage harmonic difference before and after the power supply intermediate link, and cannot quantitatively judge the isolation effect of the voltage harmonics.
Disclosure of Invention
Therefore, it is necessary to provide a method for determining a voltage harmonic isolation effect, a monitoring device, a computer device, and a computer readable storage medium for solving the above technical problems, so as to quantify the isolation effect of a power supply intermediate link on voltage harmonics in a power supply system.
A method for judging voltage harmonic isolation effect comprises the following steps:
selecting monitoring nodes of a power supply intermediate link in a power supply system, wherein the monitoring nodes comprise power supply points and power receiving points;
collecting first voltage harmonic data of the power supply point and second voltage harmonic data of the power receiving point in the monitoring node;
calculating to obtain a voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data;
and judging the isolation effect of the power supply intermediate link on the voltage harmonic based on the voltage harmonic isolation ratio.
According to the method for judging the voltage harmonic isolation effect, the power supply monitoring node and the receiving point monitoring node of the proper voltage harmonic are selected in the power supply system, the voltage harmonic data are collected at the monitoring nodes, the voltage harmonic isolation ratio can be calculated according to the collected voltage harmonic data, the voltage harmonic change numerical value of the receiving point relative to the power supply point, namely the two ends of the power supply intermediate link is determined, and therefore the quantitative method for judging the isolation effect of the power supply intermediate link can be established through the quantitative comparison property index of the voltage harmonic isolation ratio, namely the quantitative voltage harmonic spatial distribution difference, so that the evaluation requirements of the voltage harmonics of various power supply systems are met.
In one embodiment, the step of selecting a monitoring node of a power supply intermediate link in a power supply system includes:
selecting a common connection point in a power supply system as the power supply point;
and selecting a connection point which is close to the load and is not electrically isolated from the load in the power supply system as the power receiving point.
In one embodiment, the step of selecting a monitoring node of a power supply intermediate link in a power supply system further includes:
when a plurality of loads in the power supply system share a power supply point, the power supply point and each power receiving point respectively form a group of monitoring nodes, and the number of the monitoring nodes is equal to that of the power receiving points.
In one embodiment, the step of calculating a voltage harmonic isolation ratio from the first voltage harmonic data and the second voltage harmonic data comprises:
calculating to obtain a first total voltage demand distortion rate at the power supply point according to the first voltage harmonic data;
calculating to obtain a second total voltage demand distortion rate at the power receiving point according to the second voltage harmonic data;
and calculating to obtain the voltage harmonic isolation ratio according to the first voltage total demand distortion rate and the second voltage total demand distortion rate.
In one embodiment, the step of calculating the voltage harmonic isolation ratio according to the first total voltage demand distortion rate and the second total voltage demand distortion rate includes:
and calculating the change rate of the second voltage total demand distortion rate relative to the first voltage total demand distortion rate, and taking the change rate as the voltage harmonic isolation ratio.
A device for determining the effect of voltage harmonic isolation, comprising:
the node selection module is used for selecting monitoring nodes of a power supply intermediate link in a power supply system, and the monitoring nodes comprise power supply points and power receiving points;
the data acquisition module is used for acquiring first voltage harmonic data of the power supply point and second voltage harmonic data of the power receiving point in the monitoring node;
the data calculation module is used for calculating a voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data;
and the effect judgment module is used for judging the isolation effect of the power supply intermediate link on the voltage harmonic based on the voltage harmonic isolation ratio.
According to the device for judging the voltage harmonic isolation effect, the power supply monitoring node and the receiving point monitoring node of the proper voltage harmonic are selected in the power supply system, the voltage harmonic data are collected at the monitoring nodes, the voltage harmonic isolation ratio can be calculated according to the collected voltage harmonic data, the voltage harmonic change numerical value of the receiving point relative to the power supply point, namely the two ends of the power supply intermediate link is determined, and therefore a quantitative method for judging the isolation effect of the power supply intermediate link can be established through the comparison property index of the quantitative voltage harmonic isolation ratio, namely the voltage harmonic spatial distribution difference, so that the evaluation requirements of the voltage harmonics of various power supply systems are met.
A power supply system comprises a power supply, a power supply intermediate link, a load and a device for judging the voltage harmonic isolation effect in the embodiment;
the load is connected with the power supply through the power supply intermediate link, and the voltage harmonic isolation effect judgment device judges the isolation effect of the power supply intermediate link on the voltage harmonic according to the data collected at the monitoring node.
According to the power supply system, the power supply monitoring node and the receiving point monitoring node of the appropriate voltage harmonic are selected in the power supply system, the voltage harmonic data are collected at the monitoring nodes, the voltage harmonic isolation ratio can be calculated according to the collected voltage harmonic data, the voltage harmonic change numerical value of the receiving point relative to the power supply point, namely the two ends of the power supply intermediate link is determined, and therefore a quantitative judgment method for the isolation effect of the power supply intermediate link can be established through the comparison property index of the quantized voltage harmonic spatial distribution difference of the voltage harmonic isolation ratio so as to adapt to the evaluation requirements of the voltage harmonics of various power supply systems.
In one embodiment, the power supply point is a common connection point in the power supply system; the power receiving point is close to the load and is not electrically isolated from the load;
when a plurality of loads in the power supply system share a power supply point, the power supply point and each power receiving point respectively form a group of monitoring nodes, and the number of the monitoring nodes is equal to that of the power receiving points.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method when executing the program.
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 above-mentioned method.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for determining voltage harmonic isolation effects according to an embodiment;
FIG. 2 is a schematic flow chart illustrating steps for selecting a monitoring node of a power supply intermediate link in a power supply system according to an embodiment;
FIG. 3 is a schematic flow chart of steps for calculating a voltage harmonic isolation ratio based on first voltage harmonic data and second voltage harmonic data in one embodiment;
FIG. 4 is a schematic diagram illustrating an exemplary embodiment of a device for determining harmonic isolation effect;
fig. 5 is a schematic structural diagram of a power supply system in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 is a schematic flow chart of a method for determining a voltage harmonic isolation effect in an embodiment, and as shown in fig. 1, in an embodiment, a method for determining a voltage harmonic isolation effect is provided, which is applicable to, but not limited to, a single-ended power supply system, and for example, also applicable to a multi-ended power supply system, and specifically includes the following steps:
step S120: and selecting monitoring nodes of a power supply intermediate link in the power supply system, wherein the monitoring nodes comprise power supply points and power receiving points.
Step S140: first voltage harmonic data of a power supply point and second voltage harmonic data of a power receiving point in a monitoring node are collected.
Step S160: and calculating to obtain a voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data.
Step S180: and judging the isolation effect of the power supply intermediate link on the voltage harmonic based on the voltage harmonic isolation ratio.
Specifically, the power supply system refers to a power supply line from a power supply to a user load, and includes a power supply intermediate link between the power supply and the user load, where the power supply intermediate link is used for transmitting power of the power supply to the user load, such as a power grid. With the development of power electronic technology, because a large amount of nonlinear loads are connected into a power system, a large amount of harmonic waves are injected into the power supply system, the structure of a power supply intermediate link is also increasingly complex, and when equipment such as a current converter exists in the power supply intermediate link, particularly the power supply intermediate link, certain influence can be generated on the propagation of circuit harmonic waves in the power supply system. Generally, the voltage harmonic is reduced after passing through the power supply intermediate link, and the power supply intermediate link can generate a certain isolation effect on the voltage harmonic, so that the isolation effect of the power supply intermediate link on the voltage harmonic needs to be judged and evaluated. In this embodiment, the power supply intermediate link may be an ac power supply link or a dc power supply link, and the load may be an ac or dc load.
Monitoring nodes at two ends of a power supply intermediate link are selected in a power supply system, the monitoring nodes comprise a power supply point and a power receiving point, the power supply point monitoring nodes are used for monitoring voltage harmonic data before the power supply intermediate link is accessed, and the power receiving point monitoring nodes are used for monitoring the voltage harmonic data before the power supply intermediate link is accessed to a load. When a monitoring node is selected in a power line, a voltage access position of a power supply intermediate link is generally selected as a power supply point, and a position close to a user load is selected as a power receiving point.
Furthermore, the voltage data of the selected monitoring node is collected in real time, and first voltage harmonic data of the power supply point and second voltage harmonic data of the power receiving point are collected. Further, the voltage isolation ratio is calculated according to the first voltage harmonic data and the second voltage harmonic data, for example, the first voltage harmonic data may be subjected to data processing to obtain a voltage harmonic index value of the power supply point, the second voltage harmonic data may be subjected to data processing to obtain a voltage harmonic index value of the power receiving point, and the voltage harmonic isolation ratio is calculated according to the voltage harmonic index value of the power supply point and the voltage harmonic index value of the power receiving point.
The voltage harmonic isolation ratio is a numerical value used for representing the voltage harmonic change size of the power receiving point relative to the power supply point, and the voltage harmonic isolation ratio obtained through calculation is used for judging the voltage harmonic change size at two ends of the power supply intermediate link, namely the voltage harmonic isolation effect of the power supply intermediate link. In calculating the voltage harmonic isolation ratio, different calculation methods may be employed. Different calculation methods may result in different isolation effect determination results. For example, when the voltage harmonic isolation ratio is a voltage harmonic reduction percentage of the power receiving point relative to the power supply point, the greater the value of the voltage harmonic isolation ratio, the more significant the isolation effect of the power supply intermediate link on the voltage harmonic is determined, and conversely, the smaller the value of the voltage harmonic isolation ratio, the less significant the isolation effect of the power supply intermediate link on the voltage harmonic is determined.
According to the method for judging the voltage harmonic isolation effect, the power supply monitoring node and the receiving point monitoring node of the proper voltage harmonic are selected in the power supply system, the voltage harmonic data are collected at the monitoring nodes, the voltage harmonic isolation ratio can be calculated according to the collected voltage harmonic data, the voltage harmonic change numerical value of the receiving point relative to the power supply point, namely the two ends of the power supply intermediate link is determined, and therefore the quantitative method for judging the isolation effect of the power supply intermediate link can be established through the quantitative comparison property index of the voltage harmonic isolation ratio, namely the quantitative voltage harmonic spatial distribution difference, so that the evaluation requirements of the voltage harmonics of various power supply systems are met.
Fig. 2 is a schematic flowchart of a monitoring node selecting step S120 for selecting a monitoring node of a power supply intermediate link in a power supply system in an embodiment, as shown in fig. 2, in an embodiment, the step S120 includes:
step S122: and selecting a common connection point in the power supply system as a power supply point.
Step S124: and selecting a connection point which is close to the load and is not electrically isolated from the load in the power supply system as a power receiving point.
Specifically, when selecting the monitoring node, a Point of common Coupling (Point of common Coupling) in the power supply system is generally selected as a power supply Point, and the common Coupling is a connection Point of one or more user loads in the power supply system. The selection of the power receiving point needs to meet the circuit position close to the load and without electrical isolation from the load, and the voltage condition of the selected power receiving point can directly influence the operating condition of the load. One power supply point and one power receiving point form a group of monitoring nodes.
Further, in an embodiment, the step S120 may further include:
step S126: when a plurality of loads share a power supply point in a power supply system, the power supply point and each power receiving point respectively form a group of monitoring nodes, and the number of the monitoring nodes is equal to that of the power receiving points.
Specifically, a common connection point is shared by a plurality of loads, that is, one power supply point corresponds to a plurality of power receiving points. The shared power supply point forms a group of monitoring nodes at each power receiving point, so that multiple groups of monitoring nodes are selected in the multi-terminal power supply system, and the number of the selected monitoring nodes is equal to that of the power receiving points. Therefore, the voltage harmonic isolation effect of the power supply intermediate link on each load circuit can be evaluated according to the collected voltage harmonic monitoring data of the multiple groups of monitoring nodes, and the overall voltage harmonic isolation effect of the power supply intermediate link on the multipath loads can also be evaluated.
Fig. 3 is a schematic flowchart of step S160 in an embodiment, and as shown in fig. 3, in an embodiment, step S160 may specifically include:
step S162: and calculating to obtain a first total voltage demand distortion rate at the power supply point according to the first voltage harmonic data.
Step S164: and calculating to obtain a second total voltage demand distortion rate at the power receiving point according to the second voltage harmonic data.
Step S166: and calculating to obtain a voltage harmonic isolation ratio according to the first voltage total demand distortion rate and the second voltage total demand distortion rate.
Specifically, effective values of voltage harmonics in different periods may differ, and therefore, index definition needs to be performed on the overall voltage harmonic distortion conditions of the power supply point and the power receiving point according to multiple voltage harmonic values. In the present embodiment, the voltage harmonic distortion of the power supply point, that is, the voltage harmonic distortion of the power receiving point, is defined by calculating the total voltage demand distortion. When the total required voltage distortion rate is calculated, a voltage harmonic effective value is extracted from the voltage harmonic data a plurality of times, and the total required voltage distortion rate THD is calculated according to the following formula (1).
Wherein, UhiExpressing the ith voltage harmonic effective value, extracting the power supply point multiple voltage harmonic effective value and the maximum required fundamental voltage effective value from the first voltage harmonic data according to the calculation formula, and calculatingObtaining a first voltage total demand distortion rate of a power supply point
Similarly, the second voltage total demand distortion rate of the power receiving point is calculated
It is understood that in the present embodiment, the voltage total required harmonic distortion rate THD is used to define the voltage harmonic distortion condition, and in other embodiments, other indexes may also be used to define the voltage harmonic distortion condition.
Further, in an embodiment, the step S166 may specifically include:
and calculating the change rate of the second voltage total demand distortion rate relative to the first voltage total demand distortion rate, and taking the change rate as a voltage harmonic isolation ratio.
Specifically, the rate of change of the second voltage total demand distortion rate with respect to the first voltage total demand distortion rate may be calculated using the following formula (2).
Wherein,
and
respectively representing the total harmonic distortion rate of the voltage of the power supply point and the power receiving point,
and the change rate of the second voltage total demand distortion rate relative to the first voltage total demand distortion rate is represented, namely the reduction percentage of the voltage total demand harmonic distortion rate after passing through the power supply link. Considering the isolation of the harmonic voltage through the intermediate link of the power supply, the total required distortion rate of the first voltage of the power supply point
Total required distortion rate of the second voltage relative to the power receiving point
The value of (a) becomes small, and therefore, a positive reduction percentage of the voltage harmonic distortion rate can be obtained by using the above formula (2). In other embodiments, the voltage harmonic isolation ratio may also be calculated in other calculation manners, for example, a ratio of the first total voltage demand distortion rate to the second total voltage demand distortion rate may be directly used as the voltage harmonic isolation ratio.
It should be noted that the calculation of the harmonic isolation ratios of different voltages may result in different determination results of the harmonic isolation of the voltages. For example, if the voltage harmonic isolation ratio is obtained by using the formula (2), it is determined that the isolation effect of the power supply intermediate link on the voltage harmonic is greater when the voltage harmonic isolation ratio is greater, and conversely, the isolation effect of the power supply intermediate link on the voltage harmonic is smaller. And if the ratio of the first voltage total required distortion rate to the second voltage total required distortion rate is directly used as a voltage harmonic isolation ratio, when the voltage harmonic isolation ratio is larger, the isolation effect of the power supply intermediate link on the voltage harmonic is judged to be smaller, and otherwise, the isolation effect of the power supply intermediate link on the voltage harmonic is larger.
Fig. 4 is a schematic structural diagram of an apparatus for determining voltage harmonic isolation effect according to an embodiment, as shown in fig. 4, in an embodiment, an apparatus 400 for determining voltage harmonic isolation effect includes: the node selection module 420 is configured to select a monitoring node of a power supply intermediate link in a power supply system, where the monitoring node includes a power supply point and a power receiving point; the data acquisition module 440 is configured to acquire first voltage harmonic data of a power supply point and second voltage harmonic data of a power receiving point in the monitoring node; the data calculation module 460 is configured to calculate a voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data; and the effect judgment module 480 is configured to judge the isolation effect of the power supply intermediate link on the voltage harmonic based on the voltage harmonic isolation ratio.
Specifically, the node selection module 420 sets two monitoring nodes, namely, a power supply point and a power receiving point, on two sides of the power supply intermediate link, respectively, and the data acquisition module 440 is in communication connection with the power supply point and the power receiving point, respectively acquires first voltage harmonic data at the power supply point and second voltage harmonic data at the power receiving point, and sends the first harmonic voltage data and the second harmonic voltage data to the data calculation module 460. The data calculation module 460 calculates according to the received first voltage harmonic data and the second voltage harmonic data to obtain a voltage harmonic isolation ratio, and sends the voltage harmonic isolation ratio data to the effect judgment module 480, and the effect judgment module 480 determines a difference between the voltage harmonics before and after the power supply intermediate link according to the received voltage harmonic isolation ratio to judge an isolation effect of the power supply intermediate link on the voltage harmonics.
In one embodiment, the node selecting module 420 may include: the power supply point selecting unit is used for selecting a common connection point in a power supply system as a power supply point; and the power receiving point selecting unit is used for selecting a connecting point which is close to the load in the power supply system and is not electrically isolated from the load as a power receiving point.
In an embodiment, the node selecting module 420 may further include a node constructing unit, where when a plurality of loads share a power supply point in the power supply system, the power supply point and each power receiving point respectively form a group of monitoring nodes, and the number of the monitoring nodes is equal to the number of the power receiving points.
In one embodiment, the data calculation module 460 may include: the first distortion rate calculation unit is used for calculating a first total voltage demand distortion rate at the power supply point according to the first voltage harmonic data; a second distortion rate calculation unit for calculating a second total voltage demand distortion rate at the power receiving point from the second voltage harmonic data; and the isolation ratio calculation unit is used for calculating the voltage harmonic isolation ratio according to the first voltage total demand distortion rate and the second voltage total demand distortion rate.
In one embodiment, the isolation ratio calculation unit is configured to calculate a rate of change of the second total voltage demand distortion rate with respect to the first total voltage demand distortion rate, and the rate of change is used as the voltage harmonic isolation ratio.
Fig. 5 is a schematic structural diagram of a power supply system. As shown in fig. 5, in one embodiment, a power supply system 500 is provided, which includes a power source 520, a power supply intermediate link 540, a load 560, and a voltage harmonic isolation effect determination apparatus 400 in the above embodiments; the load 560 is connected to the power source 520 through the power supply intermediate link 540, and the voltage harmonic isolation effect determination apparatus 400 determines the isolation effect of the power supply intermediate link 540 on the voltage harmonic according to the data collected at the monitoring node.
Specifically, the power supply system 500 in this embodiment is a single-ended power supply system, and in other embodiments, the power supply system may also be a multi-ended power supply system. The power source 520 is an ac power source, and the power supply intermediate link 540 may be an ac or dc power supply link. The load 560 may be an ac or dc load. In fig. 5, a point a is a selected power supply point, a point b is a selected power receiving point, and the point a and the point b together form a monitoring node.
Further, the power supply point is a common connection point in a power supply system; the power receiving point is proximate to the load 560 and is not electrically isolated from the load 560. When a plurality of loads in the power supply system share a power supply point, the power supply point and each power receiving point respectively form a group of monitoring nodes, and the number of the monitoring nodes is equal to that of the power receiving points.
According to the power supply system, the power supply monitoring node and the receiving point monitoring node of the appropriate voltage harmonic are selected in the power supply system, the voltage harmonic data are collected at the monitoring nodes, the voltage harmonic isolation ratio can be calculated according to the collected voltage harmonic data, the voltage harmonic change numerical value of the receiving point relative to the power supply point, namely the two ends of the power supply intermediate link is determined, and therefore a quantitative judgment method for the isolation effect of the power supply intermediate link can be established through the comparison property index of the quantized voltage harmonic spatial distribution difference of the voltage harmonic isolation ratio so as to adapt to the evaluation requirements of the voltage harmonics of various power supply systems.
In one embodiment, a computer device is provided, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to perform the steps of: selecting monitoring nodes of a power supply intermediate link in a power supply system, wherein the monitoring nodes comprise power supply points and power receiving points; acquiring first voltage harmonic data of a power supply point and second voltage harmonic data of a power receiving point in a monitoring node; calculating to obtain a voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data; and judging the isolation effect of the power supply intermediate link on the voltage harmonic based on the voltage harmonic isolation ratio.
In one embodiment, a computer readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, may cause the processor to perform the steps of: selecting monitoring nodes of a power supply intermediate link in a power supply system, wherein the monitoring nodes comprise power supply points and power receiving points; acquiring first voltage harmonic data of a power supply point and second voltage harmonic data of a power receiving point in a monitoring node; calculating to obtain a voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data; and judging the isolation effect of the power supply intermediate link on the voltage harmonic based on the voltage harmonic isolation ratio.
For the above limitations of the computer-readable storage medium and the computer device, reference may be made to the above specific limitations of the method, which are not described herein again.
It should be noted that, as one of ordinary skill in the art can appreciate, all or part of the processes of the above methods may be implemented by instructing related hardware through a computer program, and the program may be stored in a computer-readable storage medium; the above described programs, when executed, may comprise the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM) or a Random Access Memory (RAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for judging voltage harmonic isolation effect is characterized by comprising the following steps:
selecting monitoring nodes of a power supply intermediate link in a power supply system, wherein the monitoring nodes comprise power supply points and power receiving points;
collecting first voltage harmonic data of the power supply point and second voltage harmonic data of the power receiving point in the monitoring node;
calculating to obtain a voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data;
and judging the isolation effect of the power supply intermediate link on the voltage harmonic based on the voltage harmonic isolation ratio.
2. The method of claim 1, wherein the step of selecting a monitoring node of a power supply intermediate link in the power supply system comprises:
selecting a common connection point in a power supply system as the power supply point;
and selecting a connection point which is close to the load and is not electrically isolated from the load in the power supply system as the power receiving point.
3. The method of claim 1, wherein the step of selecting a monitoring node of a power supply intermediate link in the power supply system further comprises:
when a plurality of loads in the power supply system share a power supply point, the power supply point and each power receiving point respectively form a group of monitoring nodes, and the number of the monitoring nodes is equal to that of the power receiving points.
4. The method of claim 1, wherein calculating a voltage harmonic isolation ratio from the first voltage harmonic data and the second voltage harmonic data comprises:
calculating to obtain a first total voltage demand distortion rate at the power supply point according to the first voltage harmonic data;
calculating to obtain a second total voltage demand distortion rate at the power receiving point according to the second voltage harmonic data;
and calculating to obtain the voltage harmonic isolation ratio according to the first voltage total demand distortion rate and the second voltage total demand distortion rate.
5. The method of claim 4, wherein the step of calculating the voltage harmonic isolation ratio from the first total required distortion rate and the second total required distortion rate comprises:
and calculating the change rate of the second voltage total demand distortion rate relative to the first voltage total demand distortion rate, and taking the change rate as the voltage harmonic isolation ratio.
6. A device for judging voltage harmonic isolation effect is characterized by comprising:
the node selection module is used for selecting monitoring nodes of a power supply intermediate link in a power supply system, and the monitoring nodes comprise power supply points and power receiving points;
the data acquisition module is used for acquiring first voltage harmonic data of the power supply point and second voltage harmonic data of the power receiving point in the monitoring node;
the data calculation module is used for calculating a voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data;
and the effect judgment module is used for judging the isolation effect of the power supply intermediate link on the voltage harmonic based on the voltage harmonic isolation ratio.
7. A power supply system, comprising a power supply, a power supply intermediate link, a load, and the device for determining the voltage harmonic isolation effect according to claim 6;
the load is connected with the power supply through the power supply intermediate link, and the voltage harmonic isolation effect judgment device judges the isolation effect of the power supply intermediate link on the voltage harmonic according to the data collected at the monitoring node.
8. The power supply system of claim 7, wherein the power supply point is a point of common connection in the power supply system; the power receiving point is close to the load and is not electrically isolated from the load;
when a plurality of loads in the power supply system share a power supply point, the power supply point and each power receiving point respectively form a group of monitoring nodes, and the number of the monitoring nodes is equal to that of the power receiving points.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1 to 5 are implemented when the program is executed by the processor.
10. 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 5.
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| CN113848377A (en) * | 2021-09-30 | 2021-12-28 | 深圳供电局有限公司 | Isolation degree calculation method, device, equipment and storage medium for voltage sag |
| CN113988546A (en) * | 2021-10-13 | 2022-01-28 | 深圳供电局有限公司 | Evaluation method and device of standby power supply system, computer equipment and storage medium |
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| CN113988546A (en) * | 2021-10-13 | 2022-01-28 | 深圳供电局有限公司 | Evaluation method and device of standby power supply system, computer equipment and storage medium |
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