CN111641211A - Voltage sag joint compensation optimization method and device and readable storage medium - Google Patents
Voltage sag joint compensation optimization method and device and readable storage medium Download PDFInfo
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- CN111641211A CN111641211A CN202010534809.8A CN202010534809A CN111641211A CN 111641211 A CN111641211 A CN 111641211A CN 202010534809 A CN202010534809 A CN 202010534809A CN 111641211 A CN111641211 A CN 111641211A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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Abstract
The invention discloses a voltage sag joint compensation optimization method, a device and a readable storage medium, wherein the method comprises the following steps: determining the load voltage sag depth according to the load voltage; and determining a corresponding compensation mode according to the magnitude relation between the load voltage sag depth and a set threshold. The method determines the load voltage sag depth according to the load voltage; and determining a corresponding compensation mode according to the magnitude relation between the load voltage sag depth and a set threshold. The corresponding compensation mode can be determined according to actual conditions, the advantages of energy storage compensation and DVR compensation are combined, and compared with the traditional method, the compensation range is larger, and the economical efficiency is better.
Description
Technical Field
The invention relates to the technical field of power quality control, in particular to a voltage sag joint compensation optimization method, a voltage sag joint compensation optimization device and a readable storage medium.
Background
According to statistics, the voltage sag problem of the power distribution network, particularly the tail end power distribution network, is more serious than that of the main network, and because the voltage quality of the tail end of the power distribution network is directly related to whether industrial production and resident life can be normally carried out or not, enough attention needs to be paid. The DVR is the most economical and effective power device for treating dynamic voltage quality problems such as voltage sag, voltage sag and the like, and becomes a research hotspot of researchers in recent years.
The traditional DVR adopts a capacitor as an energy storage unit, and due to the limitation of energy storage capacity, when the depth of voltage sag is large, the load voltage cannot be completely compensated. In order to improve the compensation capability of the conventional DVR, some scholars propose an energy storage compensation method, that is, a storage battery, a lithium battery and the like are used as energy storage elements, however, when a voltage sag occurs, energy required for compensating a load voltage is provided by the energy storage elements, energy storage capacity configuration needs to be not less than the load capacity, cost is high, and economical efficiency is poor.
Disclosure of Invention
In view of the foregoing drawbacks of the prior art, an object of the present invention is to provide a voltage sag joint compensation optimization method, apparatus and readable storage medium, so as to ensure the voltage sag compensation capability of the joint compensation scheme and improve the economy of the joint compensation scheme.
One of the purposes of the present invention is realized by such a technical solution, a voltage sag joint compensation optimization method, including the following steps:
determining the load voltage sag depth according to the load voltage;
and determining a corresponding compensation mode according to the magnitude relation between the load voltage sag depth and a set threshold.
Optionally, determining the load voltage sag depth according to the load voltage includes:
and determining the load voltage sag depth according to the rated value of the power grid load voltage and the measured value of the power grid load voltage.
Optionally, the load voltage sag depth is determined according to the rated value of the grid load voltage and the measured value of the grid load voltage, and the following conditions are met:
wherein is the voltage sag depth, UnIs the rated value of the load voltage, UrmsIs the measured value of the load voltage.
Optionally, determining a corresponding compensation mode according to a magnitude relationship between the load voltage sag depth and a set threshold includes:
and if the load voltage sag depth is lower than a set threshold value, a dynamic voltage restorer is used for compensating the load voltage sag.
Optionally, determining a corresponding compensation mode according to a magnitude relationship between the load voltage sag depth and a set threshold includes:
and if the load voltage sag depth is higher than a set threshold value, an energy storage element and a dynamic voltage restorer are used for compensating the load voltage sag.
Optionally, the inputting the energy storage element and the dynamic voltage restorer to compensate for the load voltage sag includes:
the energy storage element boosts the load voltage to a preset proportion of the load voltage rating, and the dynamic voltage restorer boosts the load voltage to the load voltage rating.
Optionally, the predetermined proportion of the load voltage rating is 60% to 80%.
The second purpose of the invention is realized by the technical scheme, and the voltage sag joint compensation optimization device comprises:
the data processing module is used for determining the load voltage sag depth according to the load voltage;
and the selection module is used for determining a corresponding compensation mode according to the magnitude relation between the load voltage sag depth and a set threshold value.
The third object of the present invention is achieved by the technical solution, which is a computer-readable storage medium, wherein an implementation program for information transmission is stored on the computer-readable storage medium, and when the program is executed by a processor, the implementation program implements the aforementioned voltage sag joint compensation optimization method.
Due to the adoption of the technical scheme, the invention has the following advantages:
the method determines the load voltage sag depth according to the load voltage; and determining a corresponding compensation mode according to the magnitude relation between the load voltage sag depth and a set threshold. The corresponding compensation mode can be determined according to actual conditions, the advantages of energy storage compensation and DVR compensation are combined, and compared with the traditional method, the compensation range is larger, and the economical efficiency is better.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The drawings of the invention are illustrated as follows:
FIG. 1 is a flow chart of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a DVR joint compensation system according to a first embodiment of the invention;
FIG. 3 shows a first embodiment of joint compensation method according to the present invention;
FIG. 4 shows a second embodiment of the joint compensation method of the present invention;
FIG. 5 is a graph of a grid voltage waveform according to a first embodiment of the present invention;
FIG. 6 shows the compensated load voltage of the first embodiment of the present invention using DVR;
FIG. 7 shows the load voltage after the first embodiment of the present invention adopts the joint compensation.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example one
A first embodiment of the present invention provides a voltage sag joint compensation optimization method, as shown in fig. 1, including the following steps:
s10, determining the load voltage sag depth according to the load voltage;
and S20, determining a corresponding compensation mode according to the magnitude relation between the load voltage sag depth and the set threshold value.
The method determines the load voltage sag depth according to the load voltage; and determining a corresponding compensation mode according to the magnitude relation between the load voltage sag depth and a set threshold. The corresponding compensation mode can be determined according to actual conditions, the advantages of energy storage compensation and DVR compensation are combined, and compared with the traditional method, the compensation range is larger, and the economical efficiency is better.
Optionally, determining the load voltage sag depth according to the load voltage includes:
and determining the load voltage sag depth according to the rated value of the power grid load voltage and the measured value of the power grid load voltage.
Optionally, the load voltage sag depth is determined according to the rated value of the grid load voltage and the measured value of the grid load voltage, and the following conditions are met:
here, it is the voltage sag depth, Un is the rated value of the load voltage, and Urms is the measured value of the load voltage.
Specifically, in the present embodiment, S10 calculates the sag depth of the voltage sag based on the rated value of the load voltage and the detected value of the load voltage:
in the formula, the voltage sag depth, UnIs the rated value of the load voltage, UrmsIs a detected value of the load voltage.
Optionally, determining a corresponding compensation mode according to a magnitude relationship between the load voltage sag depth and a set threshold includes:
and if the load voltage sag depth is lower than a set threshold value, a dynamic voltage restorer is used for compensating the load voltage sag.
Optionally, determining a corresponding compensation mode according to a magnitude relationship between the load voltage sag depth and a set threshold includes:
and if the load voltage sag depth is higher than a set threshold value, an energy storage element and a dynamic voltage restorer are used for compensating the load voltage sag.
Optionally, the inputting the energy storage element and the dynamic voltage restorer to compensate for the load voltage sag includes:
the energy storage element boosts the load voltage to a preset proportion of the load voltage rating, and the dynamic voltage restorer boosts the load voltage to the load voltage rating.
Optionally, the predetermined proportion of the load voltage rating is 60% to 80%.
Specifically, in the present embodiment, two-stage compensation is adopted, as shown in fig. 2, the first stage adopts energy storage compensation, and the second stage adopts DVR compensation.
When voltage sag occurs in the system, when the sag depth is lower than a set threshold, for example, the set threshold is 30% of the rated voltage, a first joint compensation mode is adopted, as shown in fig. 3, that is, the first-stage energy storage compensation is not started, and only the second-stage DVR compensation is started to raise the load voltage to be near the rated voltage;
when the sag depth is higher than the set threshold, a second joint compensation mode is adopted, as shown in fig. 4, that is, the first stage of energy storage compensation and the second stage of DVR compensation are started simultaneously, the first stage raises the load voltage to 70% of the rated voltage, and then the second stage raises the load voltage to about the rated voltage.
In this embodiment, in this example, the voltage sag depth is 60%, so the working mode of the joint compensation should be selected as mode two, the first stage of energy storage compensation and the second stage of DVR compensation are simultaneously applied to compensate the load voltage together, and compared with the case of only applying DVR compensation, as shown in fig. 5 to 7, according to fig. 6, when the voltage sag depth is deep, only applying DVR compensation load voltage peak value is lower than 200V, and far lower than the peak value 311V of the rated voltage, so that the voltage sag compensation by applying DVR is limited by the voltage sag depth. According to fig. 7, when the joint compensation method is adopted, accurate compensation of the load voltage sag can be realized even when the voltage sag depth is deep.
In summary, the present invention provides a voltage sag joint compensation method capable of improving the compensation capability of a Dynamic Voltage Restorer (DVR), wherein the compensation of the voltage sag of the method of the present invention adopts two-stage compensation, the first stage adopts energy storage compensation, and the second stage adopts DVR compensation. When voltage sag occurs in the system, when the sag depth is lower than a set threshold value, a first joint compensation mode is adopted, namely the first-stage energy storage compensation is not started, and the second-stage DVR compensation is started to raise the load voltage to be close to the rated voltage; when the sag depth is higher than the set threshold, a second joint compensation mode is adopted, namely the first-stage energy storage compensation and the second-stage DVR compensation are started simultaneously, the first stage raises the load voltage to 70% of the rated voltage, and then the second stage raises the load voltage to the vicinity of the rated voltage. Due to the adoption of a two-stage compensation method, the defect that the load voltage cannot be completely compensated when the voltage sag depth is deep in the traditional DVR is overcome; compared with the method that the whole energy for lifting the load voltage is provided by the stored energy when only the stored energy compensation is adopted, the method provided by the invention can simultaneously provide the energy by the stored energy and the power grid to lift the load voltage, and the configuration capacity of the stored energy is reduced, so that the method provided by the invention combines the advantages of the stored energy compensation and the DVR compensation, and is a method with a larger compensation range and better economy.
Example two
A second embodiment of the present invention provides a voltage sag joint compensation optimization apparatus, including:
the data processing module is used for determining the load voltage sag depth according to the load voltage;
and the selection module is used for determining a corresponding compensation mode according to the magnitude relation between the load voltage sag depth and a set threshold value.
EXAMPLE III
A third embodiment of the present invention provides a computer-readable storage medium, where an implementation program for information transfer is stored, and when the program is executed by a processor, the implementation program implements the foregoing voltage sag joint compensation optimization method.
Specifically, in one embodiment, a processor invokes a program in a computer readable storage medium to determine a load voltage sag depth based on a load voltage;
and determining a corresponding compensation mode according to the magnitude relation between the load voltage sag depth and a set threshold.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered thereby.
Claims (9)
1. A voltage sag joint compensation optimization method is characterized by comprising the following steps:
determining the load voltage sag depth according to the load voltage;
and determining a corresponding compensation mode according to the magnitude relation between the load voltage sag depth and a set threshold.
2. The voltage sag joint compensation optimization method of claim 1, wherein determining a load voltage sag depth from a load voltage comprises:
and determining the load voltage sag depth according to the rated value of the power grid load voltage and the measured value of the power grid load voltage.
3. The voltage sag joint compensation optimization method according to claim 2, wherein the load voltage sag depth is determined according to the rated value of the grid load voltage and the measured value of the grid load voltage, and the following conditions are satisfied:
wherein is the voltage sag depth, UnIs the rated value of the load voltage, UrmsIs the measured value of the load voltage.
4. The voltage sag joint compensation optimization method according to any one of claims 1 to 3, wherein determining a corresponding compensation mode according to a magnitude relation between the load voltage sag depth and a set threshold comprises:
and if the load voltage sag depth is lower than a set threshold value, a dynamic voltage restorer is used for compensating the load voltage sag.
5. The voltage sag joint compensation optimization method according to any one of claims 1 to 3, wherein determining a corresponding compensation mode according to a magnitude relation between the load voltage sag depth and a set threshold comprises:
and if the load voltage sag depth is higher than a set threshold value, an energy storage element and a dynamic voltage restorer are used for compensating the load voltage sag.
6. The voltage sag joint compensation optimization method according to claim 5, wherein the inputting of the energy storage element and the dynamic voltage restorer to compensate for the load voltage sag comprises:
the energy storage element boosts the load voltage to a preset proportion of the load voltage rating, and the dynamic voltage restorer boosts the load voltage to the load voltage rating.
7. The method of claim 6, wherein the predetermined proportion of the load voltage rating is between 60% and 80%.
8. A combined voltage sag compensation optimization device, comprising:
the data processing module is used for determining the load voltage sag depth according to the load voltage;
and the selection module is used for determining a corresponding compensation mode according to the magnitude relation between the load voltage sag depth and a set threshold value.
9. A computer-readable storage medium, wherein the computer-readable storage medium stores thereon an implementation program of information transfer, and when the program is executed by a processor, the implementation program implements the voltage sag joint compensation optimization method according to any one of claims 1 to 7.
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| CN112269097A (en) * | 2020-09-23 | 2021-01-26 | 中国人民解放军海军工程大学 | Integrated power edge computing system and control method |
| CN112366716A (en) * | 2020-10-28 | 2021-02-12 | 广东电网有限责任公司韶关供电局 | Voltage balance system of low-voltage transformer area |
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