CN110794210A - Method, device, power supply system, computer equipment and storage medium for judging effect of voltage harmonic isolation - Google Patents

Abstract

The present application relates to a method, device, computer equipment, and computer-readable storage medium for judging the effect of voltage harmonic isolation. A method for judging the effect of voltage harmonic isolation includes: selecting a monitoring node of an intermediate link of power supply in a power supply system, and the The monitoring node includes a power supply point and a power receiving point; first voltage harmonic data of the power supply point in the monitoring node and second voltage harmonic data of the power receiving point are collected; according to the first voltage harmonic data The voltage harmonic isolation ratio is obtained by calculating the wave data and the second voltage harmonic data; based on the voltage harmonic isolation ratio, the isolation effect of the power supply intermediate link on the voltage harmonic is judged. The above-mentioned method for judging the isolation effect of voltage harmonics is to select appropriate monitoring nodes in the power supply system, and collect voltage harmonic data at the monitoring nodes to calculate the voltage harmonic isolation ratio, so as to quantify the impact of voltage harmonics on the intermediate links of the power supply. to judge the isolation effect.

Description

Method, device, power supply system, computer equipment and storage medium for judging the effect of voltage harmonic isolation

technical field

The present invention relates to the technical field of harmonic monitoring, and in particular, to a method, device, power supply system, computer equipment and computer-readable storage medium for judging the effect of voltage harmonic isolation.

Background technique

With the development of power electronics technology, a large number of nonlinear loads are connected to the power system, causing a large number of harmonic voltages to enter the power grid, and under the superposition of harmonics of the AC system power supply, the entire power supply environment is full of complex voltage harmonics. The pollution of harmonic voltage to the power grid will bring about problems such as reduced power transmission efficiency and accelerated insulation aging. Therefore, more and more harmonic control equipment is installed in the power supply system to isolate the voltage harmonics in the intermediate links of the power supply.

The traditional evaluation index of voltage harmonic isolation is generally the voltage harmonic content that describes the magnitude of the harmonic, or the total harmonic distortion rate evaluated from the overall distortion degree of the voltage waveform. The voltage harmonic difference before and after the intermediate link of the power supply is accurately evaluated, and the isolation effect on the voltage harmonic cannot be judged quantitatively.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a method for judging the isolation effect of voltage harmonics, a monitoring device, computer equipment, and a computer-readable storage medium for the above technical problems, which can quantify the isolation effect of the intermediate links of power supply on the voltage harmonics in the power supply system.

A method for judging the isolation effect of voltage harmonics, comprising:

In the power supply system, a monitoring node of the power supply intermediate link is selected, and the monitoring node includes a power supply point and a power receiving point;

collecting first voltage harmonic data of the power supply point and second voltage harmonic data of the power receiving point in the monitoring node;

Calculate the voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data;

Based on the voltage harmonic isolation ratio, the isolation effect of the power supply intermediate link on the voltage harmonic is judged.

The above-mentioned method for judging the isolation effect of voltage harmonics is to select appropriate voltage harmonic power supply monitoring nodes and receiving point monitoring nodes in the power supply system, and collect voltage harmonic data at the monitoring nodes, which can be calculated according to the collected voltage harmonic data. The voltage harmonic isolation ratio is obtained, and the value of the voltage harmonic variation at the power receiving point relative to the power supply point, that is, at both ends of the intermediate link of the power supply, can be determined, so that the quantified voltage harmonic isolation ratio can be used. A quantitative method for judging the isolation effect of the intermediate links of power supply is established to meet the evaluation needs of voltage harmonics of various power supply systems.

In one of the embodiments, the step of selecting the monitoring node of the power supply intermediate link in the power supply system includes:

Selecting a common connection point in the power supply system as the power supply point;

A connection point in the power supply system that is close to the load and is not electrically isolated from the load is selected as the power receiving point.

In one of the embodiments, the step of selecting the monitoring node of the power supply intermediate link in the power supply system further includes:

When a plurality of the loads in the power supply system share a power supply point, the power supply point and each of the power receiving points 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 step of calculating the voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data includes:

Calculate the total demand distortion rate of the first voltage at the power supply point according to the first voltage harmonic data;

Calculate the total demand distortion rate of the second voltage at the power receiving point according to the second voltage harmonic data;

The voltage harmonic isolation ratio is calculated 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 voltage total demand distortion rate and the second voltage total demand distortion rate includes:

Calculate the change rate of the second voltage total demand distortion rate relative to the first voltage total demand distortion rate, and use the change rate as the voltage harmonic isolation ratio.

A device for judging the isolation effect of voltage harmonics, comprising:

The node selection module is used to select the monitoring node of the power supply intermediate link in the power supply system, and the monitoring node includes a power supply point and a power receiving point;

a data collection module, configured to collect the first voltage harmonic data of the power supply point in the monitoring node, and the second voltage harmonic data of the power receiving point;

a data calculation module, configured to calculate a voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data;

The effect judgment module is used for judging the isolation effect of the power supply intermediate link on the voltage harmonics based on the voltage harmonic isolation ratio.

The above-mentioned device for judging the isolation effect of voltage harmonics, selects appropriate voltage harmonic power supply monitoring nodes and receiving point monitoring nodes in the power supply system, and collects voltage harmonic data at the monitoring nodes, which can be calculated according to the collected voltage harmonic data. The voltage harmonic isolation ratio is obtained, and the value of the voltage harmonic variation at the power receiving point relative to the power supply point, that is, at both ends of the intermediate link of the power supply, can be determined, so that the quantified voltage harmonic isolation ratio can be used. A quantitative method for judging the isolation effect of the intermediate links of power supply is established to meet the evaluation needs of voltage harmonics of various power supply systems.

A power supply system includes a power supply, a power supply intermediate link, a load, and the device for judging the isolation effect of voltage harmonics according to the above embodiments;

The load is connected to 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 harmonics according to the data collected at the monitoring node.

In the above power supply system, by selecting suitable voltage harmonic power supply monitoring nodes and receiving point monitoring nodes in the power supply system, and collecting voltage harmonic data at the monitoring nodes, the voltage harmonic isolation ratio can be calculated according to the collected voltage harmonic data. , to determine the value of the voltage harmonic variation between the power receiving point relative to the power supply point, that is, the two ends of the intermediate link of the power supply, so that a quantitative power supply can be established through the voltage harmonic isolation ratio. The method of judging the isolation effect of the intermediate links is adapted to the evaluation needs 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;

Wherein, when a plurality of the loads in the power supply system share a power supply point, the power supply point and each of the power receiving points respectively form a group of monitoring nodes, and the number of the monitoring nodes is equal to the number of the power receiving points .

A computer device includes a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the above method when the program is executed.

A computer-readable storage medium having a computer program stored thereon, the program implementing the steps of the above method when executed by a processor.

Description of drawings

1 is a schematic flowchart of a method for judging voltage harmonic isolation effect in one embodiment;

2 is a schematic flowchart of steps in an embodiment of selecting a monitoring node of a power supply intermediate link in a power supply system;

FIG. 3 is a schematic flowchart of calculating the voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data in steps in one embodiment;

4 is a schematic structural diagram of a device for judging the isolation effect of voltage harmonics in one embodiment;

FIG. 5 is a schematic structural diagram of a power supply system in an embodiment.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

FIG. 1 is a schematic flowchart of a method for judging voltage harmonic isolation effect in one embodiment. As shown in FIG. 1 , in one embodiment, a method for judging voltage harmonic isolation effect is provided, and the method is applicable to but not limited to A single-ended power supply system, such as a multi-terminal power supply system, includes the following steps:

Step S120: Select a monitoring node in the power supply intermediate link in the power supply system, and the monitoring node includes a power supply point and a power receiving point.

Step S140: Collect the first voltage harmonic data of the power supply point and the second voltage harmonic data of the power receiving point in the monitoring node.

Step S160: Calculate the voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data.

Step S180: Determine the isolation effect of the intermediate link of the power supply on the voltage harmonics based on the voltage harmonic isolation ratio.

Specifically, a power supply system refers to a power supply line from a power source to a user load, and includes a power supply intermediate link between the power source and the user load. With the development of power electronics technology, due to a large number of nonlinear loads connected to the power system, a large number of harmonics are injected into the power supply system, and the structure of the intermediate links of the power supply has become more and more complicated. , which will have a certain impact on the propagation of circuit harmonics in the power supply system. Generally, the voltage harmonics are reduced after passing through the intermediate links of the power supply, and the intermediate links of the power supply will have a certain isolation effect on the voltage harmonics. Therefore, it is necessary to judge and evaluate the isolation effect of the intermediate links of the power supply on the voltage harmonics. Wherein, in this embodiment, the intermediate link of power supply may be an AC power supply link or a DC power supply link, and the load may be an AC or DC load.

In the power supply system, the monitoring nodes at both ends of the power supply intermediate link are selected. The monitoring node includes a power supply point and a power receiving point. The power supply point monitoring node is used to monitor the voltage harmonic data before connecting to the power supply intermediate link. It is used to monitor the voltage harmonic data before the load is connected from the intermediate link of the power supply. When selecting the monitoring node in the power supply line, generally select the position where the voltage of the intermediate link of the power supply is connected as the power supply point, and select the position close to the user's load as the power receiving point.

Further, the voltage data of the selected monitoring node is collected in real time, and the first voltage harmonic data of the power supply point and the 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, data processing can be performed on the first voltage harmonic data to obtain the voltage harmonic index value of the power supply point. The voltage harmonic index value of the power receiving point is obtained by data processing of the wave data, 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 value used to characterize the change of voltage harmonics at the power receiving point relative to the power supply point. The isolation effect of the intermediate link on the voltage harmonics. When calculating the voltage harmonic isolation ratio, different calculation methods can be used. Among them, different calculation methods may lead to different judgment results of isolation effect. For example, when the voltage harmonic isolation ratio is the reduction percentage of the voltage harmonics at the power receiving point relative to the power supply point, the larger the value of the voltage harmonic isolation ratio is, the more significant the isolation effect of the power supply intermediate link on the voltage harmonics is. 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.

The above-mentioned method for judging the isolation effect of voltage harmonics is to select appropriate voltage harmonic power supply monitoring nodes and receiving point monitoring nodes in the power supply system, and collect voltage harmonic data at the monitoring nodes, which can be calculated according to the collected voltage harmonic data. The voltage harmonic isolation ratio is obtained, and the value of the voltage harmonic variation at the power receiving point relative to the power supply point, that is, at both ends of the intermediate link of the power supply, can be determined, so that the quantified voltage harmonic isolation ratio can be used. A quantitative method for judging the isolation effect of the intermediate links of power supply is established to meet the evaluation needs of voltage harmonics of various power supply systems.

FIG. 2 is a schematic flowchart of a monitoring node selection step S120 of 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 above step S120 includes:

Step S122: Select a common connection point in the power supply system as a power supply point.

Step S124: Select a connection point in the power supply system that is close to the load and is not electrically isolated from the load as the power receiving point.

Specifically, when selecting a monitoring node, a common connection point (Point of Common Coupling) in the power supply system is generally selected as the power supply point, and the common connection point is the connection of one or more user loads in the power supply system. The selection of the power receiving point should meet the circuit position close to the load and not electrically isolated from the load, and the voltage of the selected power receiving point can directly affect the operating conditions of the load. A power supply point and a power receiving point constitute a group of monitoring nodes.

Further, in one embodiment, the above step S120 may further include:

Step S126: When multiple 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 monitoring nodes is equal to the number of power receiving points.

Specifically, a common connection point is shared for multiple loads, that is, one power supply point corresponds to multiple power receiving points. The shared power supply point forms a group of monitoring nodes at each power receiving point, then multiple groups of monitoring nodes are selected in the multi-terminal power supply system, and the number of selected monitoring nodes is equal to the number of power receiving points. Therefore, according to the collected voltage harmonic monitoring data of multiple groups of monitoring nodes, the voltage harmonic isolation effect of the power supply intermediate link on each load circuit can be evaluated separately, and the overall voltage harmonic isolation effect of the power supply intermediate link on multiple loads can also be evaluated. to evaluate.

FIG. 3 is a schematic flowchart of step S160 in one embodiment. As shown in FIG. 3 , in one embodiment, step S160 may specifically include:

Step S162: Calculate the total demand distortion rate of the first voltage at the power supply point according to the first voltage harmonic data.

Step S164: Calculate the total demand distortion rate of the second voltage at the power receiving point according to the second voltage harmonic data.

Step S166: Calculate the voltage harmonic isolation ratio according to the first voltage total demand distortion rate and the second voltage total demand distortion rate.

Specifically, there are differences in the effective values of voltage harmonics in different periods. Therefore, it is necessary to define indicators for the overall voltage harmonic distortion at the power supply point and the power receiving point according to the multiple voltage harmonic values. In this embodiment, the voltage harmonic distortion of the supply point, that is, the voltage harmonic distortion of the power receiving point, is defined by obtaining the total voltage demand distortion rate. When calculating the total voltage demand distortion rate, the effective value of multiple voltage harmonics is extracted from the voltage harmonic data, and the total voltage demand distortion rate THD is calculated according to the following formula (1).

类似地，计算出受电点的第二电压总需求畸变率

可以理解的是，在本实施例中，采用电压总需求谐波畸变率THD来定义电压谐波畸变情况，在其他实施例中，也可以采用其他指标来定义电压谐波畸变情况。Among them, U _hi represents the effective value of the i-th voltage harmonic. According to the above calculation formula, the effective value of the multiple voltage harmonics of the power supply point and the fundamental voltage effective value of the maximum demand are extracted from the first voltage harmonic data to calculate Obtain the total demand distortion rate of the first voltage at the power supply point

Similarly, the total demand distortion rate of the second voltage at the receiving point is calculated

It can be understood that, in this embodiment, the voltage harmonic distortion rate THD is used to define the voltage harmonic distortion. In other embodiments, other indicators can also be used to define the voltage harmonic distortion.

Further, in one embodiment, the foregoing step S166 may specifically include:

Calculate the change rate of the second voltage total demand distortion rate relative to the first voltage total demand distortion rate, and use the change rate as the voltage harmonic isolation ratio.

Specifically, the following formula (2) can be used to calculate the rate of change of the second voltage total demand distortion rate relative to the first voltage total demand distortion rate.

和

分别表示供电点和受电点电压总谐波畸变率，

表示第二电压总需求畸变率相对于所述第一电压总需求畸变率的变化率，即经过供电环节后电压总需求谐波畸变率的减小百分比。考虑谐波电压经过供电中间环节的隔离作用，供电点的第一电压总需求畸变率

相对于受电点的第二电压总需求畸变率

的数值会变小，因此，采用上述公式(2)可以得到一个正数的电压谐波畸变率的减小百分比。在其他实施例中，也可以采用其他计算方式计算电压谐波隔离比，例如，可以直接将第一电压总需求畸变率与第二电压总需求畸变率的比值作为电压谐波隔离比。in,

and

represent the total harmonic distortion rate of the voltage at the power supply point and the power receiving point, respectively,

Represents the change rate of the second voltage total demand distortion rate relative to the first voltage total demand distortion rate, that is, the reduction percentage of the voltage total demand harmonic distortion rate after the power supply link. Considering the isolation effect of the harmonic voltage through the intermediate link of the power supply, the total demand distortion rate of the first voltage at the power supply point

Distortion rate of the total demand for the second voltage relative to the receiving point

The value of , will become smaller, therefore, a positive reduction percentage of voltage harmonic distortion can be obtained by using the above formula (2). In other embodiments, other calculation methods may also be used to calculate the voltage harmonic isolation ratio. For example, the ratio of the total demand distortion rate of the first voltage to the total demand distortion rate of the second voltage may be directly used as the voltage harmonic isolation ratio.

It should be noted that different calculation methods of voltage harmonic isolation ratio will lead to different judgment results of voltage harmonic isolation. For example, if the voltage harmonic isolation ratio is obtained by using formula (2), when the voltage harmonic isolation ratio is larger, it is determined that the isolation effect of the power supply intermediate link on the voltage harmonic is greater. The smaller the isolation effect. However, if the ratio of the total demand distortion rate of the first voltage to the total demand distortion rate of the second voltage is directly used as the voltage harmonic isolation ratio, then when the voltage harmonic isolation ratio is larger, the isolation effect of the intermediate link of the power supply on the voltage harmonic is determined. The smaller the value, the greater the isolation effect of the intermediate link of the power supply on the voltage harmonics.

FIG. 4 is a schematic structural diagram of an apparatus for judging the isolation effect of voltage harmonics in one embodiment. As shown in FIG. 4 , in one embodiment, an apparatus 400 for judging the isolation effect of voltage harmonics includes: a node selection module 420, which uses In the power supply system, the monitoring node of the power supply intermediate link is selected, and the monitoring node includes a power supply point and a power receiving point; the data acquisition module 440 is used to collect the first voltage harmonic data of the power supply point in the monitoring node, and the power receiving point. The second voltage harmonic data; the data calculation module 460 is used for calculating the voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data; the effect judgment module 480 is used for judging based on the voltage harmonic isolation ratio The isolation effect of the intermediate link of the power supply on the voltage harmonics.

Specifically, the node selection module 420 sets two monitoring nodes, a power supply point and a power receiving point, respectively, on both sides of the power supply intermediate link. The voltage harmonic data and the second voltage harmonic data at the power receiving point are sent to the data calculation module 460 . The data calculation module 460 performs calculation according to the received first voltage harmonic data and the second voltage harmonic data to obtain the 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 the difference between the voltage harmonics before and after the power supply intermediate link according to the received voltage harmonic isolation ratio, so as to judge the isolation effect of the power supply intermediate link on the voltage harmonics.

In one embodiment, the above node selection module 420 may include: a power supply point selection unit for selecting a common connection point in the power supply system as a power supply point; a power receiving point selection unit for selecting a power supply system close to the load and with The connection point of the load without electrical isolation is used as the receiving point.

In one embodiment, the node selection module 420 may further include a node constituting unit, which is used for when multiple 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 monitoring nodes is equal to the number of receiving points. number of electrical points.

In one embodiment, the data calculation module 460 may include: a first distortion rate calculation unit, configured to calculate the first voltage total demand distortion rate at the power supply point according to the first voltage harmonic data; a second distortion rate calculation unit, It is used to calculate the total demand distortion rate of the second voltage at the power receiving point according to the second voltage harmonic data; the isolation ratio calculation unit is used to calculate the voltage according to the total demand distortion rate of the first voltage and the total demand distortion rate of the second voltage. Harmonic isolation ratio.

In one embodiment, the above isolation ratio calculation unit is configured to calculate the change rate of the total demand distortion rate of the second voltage relative to the total demand distortion rate of the first voltage, and use the change rate 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, including a power supply 520 , a power supply intermediate link 540 , a load 560 , and a device 400 for judging the isolation effect of voltage harmonics in the above embodiment; wherein the load 560 is connected to the power supply 520 through the power supply intermediate link 540, and the voltage harmonic isolation effect judgment device 400 judges the isolation effect of the power supply intermediate link 540 on the voltage harmonics according to the data collected at the monitoring node.

Specifically, the power supply system 500 in this embodiment is a single-terminal power supply system. In other embodiments, the power supply system may also be a multi-terminal power supply system. The power supply 520 adopts an AC power supply, and the power supply intermediate link 540 may be an AC or DC power supply link. Load 560 may be an AC or DC load. Among them, point a shown in FIG. 5 is the selected power supply point, point b is the selected power receiving point, and point a and point b together constitute a monitoring node.

Further, the above-mentioned power supply point is a common connection point in the power supply system; the above-mentioned power receiving point is close to the load 560 and is not electrically isolated from the load 560 . Wherein, when multiple 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 monitoring nodes is equal to the number of power receiving points.

In the above power supply system, by selecting appropriate voltage harmonic power supply monitoring nodes and receiving point monitoring nodes in the power supply system, and collecting voltage harmonic data at the monitoring nodes, the voltage harmonic isolation ratio can be calculated according to the collected voltage harmonic data. , to determine the value of the voltage harmonic variation between the power receiving point relative to the power supply point, that is, the two ends of the intermediate link of the power supply, so that a quantitative power supply can be established through the voltage harmonic isolation ratio. The method of judging the isolation effect of the intermediate links is adapted to the evaluation needs of the voltage harmonics of various power supply systems.

In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the program, the processor can perform the following steps: selecting a power supply in a power supply system The monitoring node of the intermediate link, the monitoring node includes a power supply point and a power receiving point; collects the first voltage harmonic data of the power supply point in the monitoring node, and the second voltage harmonic data of the power receiving point; The second voltage harmonic data is calculated to obtain the voltage harmonic isolation ratio; based on the voltage harmonic isolation ratio, the isolation effect of the power supply intermediate link on the voltage harmonic is judged.

In one embodiment, a computer-readable storage medium is provided, and a computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, the processor can perform the following steps: selecting a power supply in a power supply system The monitoring node of the intermediate link, the monitoring node includes a power supply point and a power receiving point; collects the first voltage harmonic data of the power supply point in the monitoring node, and the second voltage harmonic data of the power receiving point; The second voltage harmonic data is calculated to obtain the voltage harmonic isolation ratio; based on the voltage harmonic isolation ratio, the isolation effect of the power supply intermediate link on the voltage harmonic is judged.

For the above limitations on the computer-readable storage medium and the computer device, reference may be made to the specific limitations on the method above, which will not be repeated here.

It should be noted that those of ordinary skill in the art can understand that all or part of the process in the above-mentioned method can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium; the above-mentioned When the program is executed, it may include the flow of the embodiments of the above-mentioned methods. The above storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM for short) or a random access memory (Random Access Memory, RAM for short).

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present application, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims (10)

1. a judgment method of voltage harmonic isolation effect, is characterized in that, comprises: In the power supply system, a monitoring node of the power supply intermediate link is selected, and the monitoring node includes a power supply point and a power receiving point; collecting first voltage harmonic data of the power supply point and second voltage harmonic data of the power receiving point in the monitoring node; Calculate the voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data; Based on the voltage harmonic isolation ratio, the isolation effect of the power supply intermediate link on the voltage harmonic is judged. 2. The method according to 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 the power supply system as the power supply point; A connection point in the power supply system that is close to the load and is not electrically isolated from the load is selected as the power receiving point. 3. The method according to 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 the loads in the power supply system share a power supply point, the power supply point and each of the power receiving points respectively form a group of monitoring nodes, and the number of the monitoring nodes is equal to the number of the power receiving points. 4. The method according to claim 1, wherein the step of calculating the voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data comprises: Calculate the total demand distortion rate of the first voltage at the power supply point according to the first voltage harmonic data; Calculate the total demand distortion rate of the second voltage at the power receiving point according to the second voltage harmonic data; The voltage harmonic isolation ratio is calculated according to the first voltage total demand distortion rate and the second voltage total demand distortion rate. 5 . The method according to claim 4 , wherein the step of calculating the voltage harmonic isolation ratio according to the first voltage total demand distortion rate and the second voltage total demand distortion rate comprises: 6 . Calculate the change rate of the second voltage total demand distortion rate relative to the first voltage total demand distortion rate, and use the change rate as the voltage harmonic isolation ratio. 6. A judging device for voltage harmonic isolation effect, characterized in that, comprising: The node selection module is used to select the monitoring node of the power supply intermediate link in the power supply system, and the monitoring node includes a power supply point and a power receiving point; a data collection module, configured to collect the first voltage harmonic data of the power supply point in the monitoring node, and the second voltage harmonic data of the power receiving point; a data calculation module, configured to calculate a voltage harmonic isolation ratio according to the first voltage harmonic data and the second voltage harmonic data; The effect judgment module is used for judging the isolation effect of the power supply intermediate link on the voltage harmonics based on the voltage harmonic isolation ratio. 7. A power supply system, characterized in that it comprises a power supply, a power supply intermediate link, a load, and the device for judging the isolation effect of voltage harmonics according to claim 6; The load is connected to 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 harmonics according to the data collected at the monitoring node. 8 . The power supply system according to claim 7 , wherein 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; 8 . Wherein, when a plurality of the loads in the power supply system share a power supply point, the power supply point and each of the power receiving points respectively form a group of monitoring nodes, and the number of the monitoring nodes is equal to the number of the power receiving points . 9. A computer device, comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements any one of claims 1 to 5 when executing the program the steps of the method described in item. 10. A computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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