CN110940856B - Method and device for judging current harmonic isolation effect, power supply system, computer equipment and storage medium - Google Patents
Method and device for judging current 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 current harmonic isolation effect, computer equipment and a computer readable storage medium, wherein the method for judging the current 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 current harmonic data of the power supply point and second current harmonic data of the power receiving point in the monitoring node; calculating to obtain a current harmonic isolation ratio according to the first current harmonic data and the second current harmonic data; and judging the isolation effect of the power supply intermediate link on the current harmonic wave based on the current harmonic wave isolation ratio. According to the method for judging the current harmonic isolation effect, the appropriate monitoring node is selected from the power supply system, and the current harmonic data is collected at the monitoring node to be calculated to obtain the current harmonic isolation ratio, so that the isolation effect of the power supply intermediate link on the current harmonic is quantitatively judged.
Description
Technical Field
The present invention relates to the field of harmonic monitoring technologies, and in particular, to a method and an apparatus for determining a current harmonic isolation effect, a power supply system, a computer device, and a computer-readable storage medium.
Background
With the development of power electronic technology, nonlinear loads are connected to a power system in a large amount, so that a large amount of harmonic current enters a power grid. The pollution of harmonic current 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 the current harmonic is isolated in the middle link of power supply.
The traditional evaluation indexes of current harmonic isolation generally describe the current harmonic content of harmonic magnitude or the total harmonic distortion rate evaluated from the integral distortion degree of current waveform, are specific to the characteristics of current harmonics, cannot accurately evaluate the current harmonic difference before and after the power supply intermediate link, and cannot quantitatively judge the isolation effect of the current harmonics.
Disclosure of Invention
Therefore, it is necessary to provide a method for determining a current 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 current harmonics in a power supply system.
A method for judging the current 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 current harmonic data of the power supply point and second current harmonic data of the power receiving point in the monitoring node;
calculating to obtain a current harmonic isolation ratio according to the first current harmonic data and the second current harmonic data;
and judging the isolation effect of the power supply intermediate link on the current harmonic based on the current harmonic isolation ratio.
According to the method for judging the isolation effect of the current harmonic wave, the power supply monitoring node and the receiving point monitoring node of the proper current harmonic wave are selected in the power supply system, the current harmonic wave data are collected at the monitoring nodes, the current harmonic wave isolation ratio can be calculated according to the collected current harmonic wave data, the current harmonic wave 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 current harmonic wave spatial distribution difference, namely the current harmonic wave isolation ratio, so that the evaluation requirements of the current harmonic wave 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 the 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 current harmonic isolation ratio from the first current harmonic data and the second current harmonic data comprises:
calculating to obtain a first total current demand distortion rate at the power supply point according to the first current harmonic data;
calculating to obtain a second total current demand distortion rate at the power receiving point according to the second current harmonic data;
and calculating the current harmonic isolation ratio according to the first total current demand distortion rate and the second total current demand distortion rate.
In one embodiment, the step of calculating the current harmonic isolation ratio according to the first total current demand distortion rate and the second total current demand distortion rate includes:
calculating a rate of change of the second total current demand distortion rate with respect to the first total current demand distortion rate, the rate of change being taken as the current harmonic isolation ratio.
A device for determining the effect of current 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 current harmonic data of the power supply point and second current harmonic data of the power receiving point in the monitoring node;
the data calculation module is used for calculating a current harmonic isolation ratio according to the first current harmonic data and the second current harmonic data;
and the effect judgment module is used for judging the isolation effect of the power supply intermediate link on the current harmonic based on the current harmonic isolation ratio.
According to the device for judging the current harmonic isolation effect, the power supply monitoring node and the receiving point monitoring node of the proper current harmonic are selected in the power supply system, the current harmonic data are collected at the monitoring nodes, the current harmonic isolation ratio can be calculated according to the collected current harmonic data, the current 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 current harmonic spatial distribution difference of the current harmonic isolation ratio so as to adapt to the evaluation requirements of the current harmonics of various power supply systems.
A power supply system comprises a power supply, a power supply intermediate link, a load and a device for judging the current harmonic isolation effect in the embodiment;
the load is connected with the power supply through the power supply intermediate link, and the current harmonic isolation effect judgment device judges the isolation effect of the power supply intermediate link on current harmonics according to data collected at the monitoring nodes.
According to the power supply system, the power supply monitoring node and the receiving point monitoring node of the appropriate current harmonic wave are selected in the power supply system, the current harmonic wave data are collected at the monitoring nodes, the current harmonic wave isolation ratio can be calculated according to the collected current harmonic wave data, the current harmonic wave change numerical values of the receiving point relative to the power supply point, namely the two ends of the power supply intermediate link are 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 current harmonic wave spatial distribution difference of the current harmonic wave isolation ratio so as to adapt to the evaluation requirements of the current harmonic waves 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 current harmonic isolation effect 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 current harmonic isolation ratio based on first current harmonic data and second current harmonic data in one embodiment;
FIG. 4 is a schematic diagram illustrating an 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 current harmonic isolation effect in an embodiment, and as shown in fig. 1, in an embodiment, a method for determining a current 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 current harmonic data of a power supply point and second current harmonic data of a power receiving point in a monitoring node are collected.
Step S160: and calculating to obtain a current harmonic isolation ratio according to the first current harmonic data and the second current harmonic data.
Step S180: and judging the isolation effect of the power supply intermediate link on the current harmonic based on the current 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 current harmonics are reduced after passing through the power supply intermediate link, and the power supply intermediate link can generate a certain isolation effect on the current harmonics, so that the isolation effect of the power supply intermediate link on the current harmonics 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 current harmonic data before the power supply intermediate link is accessed, and the power receiving point monitoring nodes are used for monitoring the current harmonic data before the power supply intermediate link is accessed to a load. When a monitoring node is selected in a power line, a current 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 current data of the selected monitoring node is collected in real time, and first current harmonic data of the power supply point and second current harmonic data of the power receiving point are collected. Further, the current isolation ratio is calculated according to the first current harmonic data and the second current harmonic data, for example, the first current harmonic data may be subjected to data processing to obtain a current harmonic index value of the power feeding point, the second current harmonic data may be subjected to data processing to obtain a current harmonic index value of the power receiving point, and the current harmonic isolation ratio is calculated according to the current harmonic index value of the power feeding point and the current harmonic index value of the power receiving point.
The current harmonic isolation ratio is a numerical value used for representing the current harmonic change size of the power receiving point relative to the power supply point, and the current harmonic isolation ratio obtained through calculation is used for judging the current harmonic change size at two ends of the power supply intermediate link, namely the current harmonic isolation effect of the power supply intermediate link. In calculating the current harmonic isolation ratio, different calculation methods may be employed. Different calculation methods may result in different isolation effect determination results. For example, when the current harmonic isolation ratio is a current harmonic reduction percentage of the power receiving point relative to the power supply point, the larger the value of the current harmonic isolation ratio is, the more significant the isolation effect of the power supply intermediate link on the current harmonic is determined, and conversely, the smaller the value of the current harmonic isolation ratio is, the less significant the isolation effect of the power supply intermediate link on the current harmonic is determined.
According to the method for judging the isolation effect of the current harmonic wave, the power supply monitoring node and the receiving point monitoring node of the proper current harmonic wave are selected in the power supply system, the current harmonic wave data are collected at the monitoring nodes, the current harmonic wave isolation ratio can be calculated according to the collected current harmonic wave data, the current harmonic wave 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 current harmonic wave spatial distribution difference, namely the current harmonic wave isolation ratio, so that the evaluation requirements of the current harmonic wave 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 (node of Common Coupling) in the power supply system is generally selected as a power supply node, 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 in the power supply system share power supply points, the power supply points and all power receiving points 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 current harmonic isolation effect of the power supply intermediate link on each load circuit can be evaluated according to the collected current harmonic monitoring data of the multiple groups of monitoring nodes, and the overall current harmonic isolation effect of the power supply intermediate link on multiple paths of 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 the total first current demand distortion rate at the power supply point according to the first current harmonic data.
Step S164: and calculating to obtain a second total current demand distortion rate at the power receiving point according to the second current harmonic data.
Step S166: and calculating to obtain a current harmonic isolation ratio according to the first total current demand distortion rate and the second total current demand distortion rate.
Specifically, effective values of current harmonics in different periods may differ, and therefore, index definition needs to be performed on the overall current harmonic distortion conditions of the power supply point and the power receiving point according to multiple current harmonic values. In the present embodiment, the current harmonic distortion of the power supply point, that is, the current harmonic distortion of the power receiving point, is defined by calculating the total current demand distortion. When the total required current distortion rate is calculated, a plurality of times of current harmonic effective values and a maximum required fundamental current effective value are extracted from the current harmonic data, and the total required current distortion rate TDD is calculated according to the following equation (1).
Wherein, IhiRepresents the effective value of the ith current harmonic wave, Ih1_maxThe effective value of the fundamental current representing the maximum demand. According to the calculation formula, extracting multiple current harmonic effective values of the power supply point and the maximum required fundamental current effective value from the first current harmonic data, and calculating to obtain the total required distortion rate TDD of the first current of the power supply pointaSimilarly, a second total current demand distortion rate TDD of the power receiving point is calculatedb. Different from the fact that the effective value of the fundamental wave of the system voltage is stable, and the effective values of the fundamental wave of the load current are different in different operation modes, in the embodiment, the current harmonic distortion condition defined by the total current demand harmonic distortion rate TDD is more accurate. In other embodiments, other criteria may be used to define the current harmonic distortion.
Further, in an embodiment, the step S166 may specifically include:
and calculating the change rate of the second total current demand distortion rate relative to the first total current demand distortion rate, and taking the change rate as a current harmonic isolation ratio.
Specifically, the rate of change of the second current total demand distortion rate with respect to the first current total demand distortion rate can be calculated using the following formula (2).
Wherein, TDDaAnd TDDbRepresenting the total harmonic distortion, Seg, of the current at the supply and receiving points, respectivelyTDDAnd the change rate of the second total current demand distortion rate relative to the first total current demand distortion rate is represented, namely the reduction percentage of the total current demand harmonic distortion rate after passing through the power supply link. Considering the isolation of harmonic current through the intermediate power supply link, the total first current demand distortion rate TDD of the power supply pointaSecond total current demand distortion rate TDD relative to power receiving pointbThe value of (a) becomes small, and therefore, a positive reduction percentage of the current harmonic distortion rate can be obtained by using the above formula (2). In other embodiments, the current harmonic isolation ratio may be calculated in other calculation manners, for example, a ratio of the first total demand distortion rate to the second total demand distortion rate may be directly used as the current harmonic isolation ratio.
It should be noted that the calculation of different current harmonic isolation ratios results in different current harmonic isolation determination results. For example, if the current 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 current harmonic is greater when the current harmonic isolation ratio is greater, and conversely, the isolation effect of the power supply intermediate link on the current harmonic is smaller. And if the ratio of the total required distortion rate of the first current to the total required distortion rate of the second current is directly used as the current harmonic isolation ratio, when the current harmonic isolation ratio is larger, the isolation effect of the power supply intermediate link on the current harmonic is judged to be smaller, and otherwise, the isolation effect of the power supply intermediate link on the current harmonic is judged to be larger.
Fig. 4 is a schematic structural diagram of an apparatus for determining a current harmonic isolation effect according to an embodiment, as shown in fig. 4, in an embodiment, an apparatus 400 for determining a current 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 current harmonic data of a power supply point and second current harmonic data of a power receiving point in the monitoring node; the data calculation module 460 is configured to calculate a current harmonic isolation ratio according to the first current harmonic data and the second current harmonic data; and the effect judging module 480 is configured to judge an isolation effect of the power supply intermediate link on the current harmonic based on the current 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 current harmonic data at the power supply point and second current harmonic data at the power receiving point, and sends the first harmonic current data and the second harmonic current data to the data calculation module 460. The data calculation module 460 calculates according to the received first current harmonic data and second current harmonic data to obtain a current harmonic isolation ratio, and sends the current harmonic isolation ratio data to the effect judgment module 480, and the effect judgment module 480 determines a difference between current harmonics before and after the power supply intermediate link according to the received current harmonic isolation ratio to judge an isolation effect of the power supply intermediate link on the current 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 forming 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 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: a first distortion rate calculation unit for calculating a first total current demand distortion rate at the power supply point based on the first current harmonic data; a second distortion rate calculation unit for calculating a second total current demand distortion rate at the power receiving point from the second current harmonic data; and the isolation ratio calculation unit is used for calculating the current harmonic isolation ratio according to the first total current demand distortion rate and the second total current demand distortion rate.
In one embodiment, the isolation ratio calculation unit is configured to calculate a rate of change of the total demand distortion rate of the second current with respect to the total demand distortion rate of the first current, and use the rate of change as the current 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 device 400 for determining the current harmonic isolation effect in the above embodiments; the load 560 is connected to the power source 520 through the power supply intermediate link 540, and the current harmonic isolation effect determination apparatus 400 determines the isolation effect of the power supply intermediate link 540 on the current 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 current harmonic wave are selected in the power supply system, the current harmonic wave data are collected at the monitoring nodes, the current harmonic wave isolation ratio can be calculated according to the collected current harmonic wave data, the current harmonic wave change numerical values of the receiving point relative to the power supply point, namely the two ends of the power supply intermediate link are 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 current harmonic wave spatial distribution difference of the current harmonic wave isolation ratio so as to adapt to the evaluation requirements of the current harmonic waves 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; collecting first current harmonic data of a power supply point and second current harmonic data of a power receiving point in a monitoring node; calculating to obtain a current harmonic isolation ratio according to the first current harmonic data and the second current harmonic data; and judging the isolation effect of the power supply intermediate link on the current harmonic based on the current 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 current harmonic data of a power supply point and second current harmonic data of a power receiving point in a monitoring node; calculating to obtain a current harmonic isolation ratio according to the first current harmonic data and the second current harmonic data; and judging the isolation effect of the power supply intermediate link on the current harmonic wave based on the current harmonic wave 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, and these are all 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 (9)
1. A method for judging current 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 current harmonic data of the power supply point and second current harmonic data of the power receiving point in the monitoring node;
calculating to obtain a first total current demand distortion rate at the power supply point according to the first current harmonic data; calculating to obtain a second total current demand distortion rate at the power receiving point according to the second current harmonic data;
calculating to obtain the current harmonic isolation ratio according to the first total current demand distortion rate and the second total current demand distortion rate;
judging the isolation effect of the power supply intermediate link on the current harmonic based on the current harmonic isolation ratio;
the step of calculating the current harmonic isolation ratio according to the first total current demand distortion rate and the second total current demand distortion rate comprises:
calculating a rate of change of the second total current demand distortion rate relative to the first total current demand distortion rate:
TDDaa first total current demand distortion rate, TDD, for the supply pointbA second total required current distortion rate, Seg, of the power receiving pointTDDIs the rate of change of the second total current demand distortion rate relative to the first total current demand distortion rate;
calculating a rate of change of the second total current demand distortion rate with respect to the first total current demand distortion rate, the rate of change being taken as the current 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. A device for determining an effect of current 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 current harmonic data of the power supply point in the monitoring node and second current harmonic data of the power receiving point;
the data calculation module is used for calculating a first total current demand distortion rate at the power supply point according to the first current harmonic data; calculating to obtain a second total current demand distortion rate at the power receiving point according to the second current harmonic data; calculating to obtain the current harmonic isolation ratio according to the first total current demand distortion rate and the second total current demand distortion rate;
the effect judgment module is used for judging the isolation effect of the power supply intermediate link on the current harmonic based on the current harmonic isolation ratio;
the step of calculating the current harmonic isolation ratio according to the first total current demand distortion rate and the second total current demand distortion rate comprises:
calculating a rate of change of the second total current demand distortion rate relative to the first total current demand distortion rate:
TDDaa first total current demand distortion rate, TDD, for the supply pointbA second total required current distortion rate, Seg, of the power receiving pointTDDIs the rate of change of the second total current demand distortion rate relative to the first total current demand distortion rate;
calculating a rate of change of the second total current demand distortion rate with respect to the first total current demand distortion rate, the rate of change being taken as the current harmonic isolation ratio.
5. The apparatus according to claim 4, wherein the node selection module comprises a power supply point selection unit and a power receiving point selection unit;
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 has no electrical isolation with the load as a power receiving point.
6. A power supply system, comprising a power supply, a power supply intermediate link, a load, and the device for determining the current harmonic isolation effect according to claim 4 or 5;
the load is connected with the power supply through the power supply intermediate link, and the current harmonic isolation effect judgment device judges the isolation effect of the power supply intermediate link on current harmonics according to data collected at the monitoring nodes.
7. The power supply system of claim 6, 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.
8. 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 3 are implemented when the program is executed by the processor.
9. 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 3.
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