CN117638999A - Three-phase load unbalance treatment effect evaluation method and device for power distribution area - Google Patents
Three-phase load unbalance treatment effect evaluation method and device for power distribution area Download PDFInfo
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Abstract
The invention relates to the technical field of intelligent power distribution, and particularly provides a three-phase load imbalance treatment effect evaluation method and device for a power distribution area, wherein the method comprises the following steps: determining unbalance degree of the distribution transformer area after the three-phase load unbalance treatment based on the phase current of the distribution transformer area after the three-phase load unbalance treatment; and evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the unbalance degree of the distribution transformer area after the three-phase load unbalance treatment. The technical scheme provided by the invention can be used for checking the effect of the electric energy quality control of the low-voltage distribution transformer area and providing a reference for the intelligent construction of the low-voltage distribution transformer area.
Description
Technical Field
The invention relates to the technical field of intelligent power distribution, in particular to a three-phase load unbalance treatment effect evaluation method and device for a power distribution area.
Background
In recent years, the problems of unbalanced three-phase load, harmonic phenomenon and other electric energy quality of a distribution area frequently occur, so that the electricity utilization experience of customers is affected, and meanwhile, a plurality of difficulties are brought to a power supply enterprise, and the damage of the network loss of a power distribution network, the reduction of the operation efficiency and the faults of a power grid and power distribution equipment are caused.
The problem of unbalanced three phases is increasingly prominent, the unbalanced three-phase load distribution of the transformer area can cause unbalanced three phases of distribution and transformation currents, adverse factors can be generated for safe operation, high-quality power supply quality and economic operation of equipment of a power distribution network, and the problems comprise high operation temperature of a transformer, increased neutral line current, increased loss of electric energy, heavy overload of the transformer and too low short voltage of power utilization users in the power distribution network. Along with the change of the load of the platform area, the three-phase unbalance also changes, so that the real effect can be obtained only by monitoring the load change normally and taking operation and maintenance measures in a targeted manner, the problems can be found and solved in time, and the disorder and repeated occurrence of the problems before and after the cleaning are avoided. In addition, the manual adjustment of the three-phase unbalanced load distribution which is commonly adopted at present requires a great amount of labor, material resources and time cost, and the power failure of branch lines of a platform area can be related when the adjustment range is large, and an automatic adjusting device is required to be additionally arranged and a corresponding control strategy is adopted to change the current situation.
In field applications, the abatement effects may vary due to environmental and human mishandling factors. Therefore, the effect of the electric energy quality control is necessary to be tested, evaluated and analyzed.
Disclosure of Invention
In order to overcome the defects, the invention provides a three-phase load unbalance treatment effect evaluation method and device for a power distribution area.
In a first aspect, a method for evaluating a three-phase load imbalance treatment effect of a power distribution area is provided, where the method for evaluating a three-phase load imbalance treatment effect of a power distribution area includes:
determining unbalance degree of the distribution transformer area after the three-phase load unbalance treatment based on the phase current of the distribution transformer area after the three-phase load unbalance treatment;
and evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the unbalance degree of the distribution transformer area after the three-phase load unbalance treatment.
Preferably, the calculation formula of the unbalance degree of the distribution area after three-phase load unbalance treatment is as follows:
B＝(L max -L min )/L max *100％
wherein B is unbalance degree of the distribution area after three-phase load unbalance treatment, L max For maximum phase current of distribution transformer area, L min Minimum phase current for the distribution block.
Preferably, the evaluation of the effect of three-phase load unbalance management of the distribution transformer area based on the unbalance degree of the distribution transformer area after three-phase load unbalance management comprises:
determining the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment based on the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment;
if the unbalance degree of the distribution area after the three-phase load unbalance treatment meets the first constraint condition and/or the unbalance rate of the distribution area after the three-phase load unbalance treatment meets the second constraint condition, the three-phase load unbalance treatment effect of the distribution area is qualified, otherwise, the three-phase load unbalance treatment effect of the distribution area is not qualified.
Further, the calculation formula of the unbalance rate of the distribution area after the three-phase load unbalance treatment is as follows:
in the above formula, P is the unbalance rate of the distribution area after the three-phase load unbalance treatment, T is a preset period, and B is the unbalance degree of the distribution area after the three-phase load unbalance treatment.
Further, the first constraint condition is that an error between the unbalance degree and the lowest unbalance degree value of the distribution transformer area after three-phase load unbalance treatment is within a preset value;
the second constraint condition is that the unbalance rate of the distribution area after three-phase load unbalance treatment is not more than 1.
Preferably, the method comprises:
acquiring the frequency of phase change switch actions of a distribution area in the three-phase load unbalance treatment process;
and evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the frequency of the phase change switch actions of the distribution transformer area in the three-phase load unbalance treatment process.
Preferably, the evaluation of the three-phase load unbalance management effect of the distribution transformer area based on the number of the commutation switch actions of the distribution transformer area in the three-phase load unbalance management process comprises:
if the sum of the times of single phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a third constraint condition and/or the sum of the times of all phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a fourth constraint condition, the three-phase load unbalance treatment effect of the power distribution station area is qualified, otherwise, the three-phase load unbalance treatment effect of the power distribution station area is not qualified.
Further, the third constraint condition is that an error between the sum of the single phase change switch action times and the minimum single phase change switch action times of the distribution transformer area in the three-phase load unbalance treatment process is within a preset value;
the fourth constraint condition is that the error between the sum of the times of all the phase change switch actions and the minimum times of all the phase change switch actions in the three-phase load unbalance treatment process of the power distribution area is within a preset value.
Further, the preset value is 5%.
In a second aspect, there is provided a three-phase load unbalance management effect evaluation device of a power distribution station, the three-phase load unbalance management effect evaluation device of the power distribution station including:
the first determining module is used for determining the unbalance degree of the distribution area after the three-phase load unbalance treatment based on the phase current of the distribution area after the three-phase load unbalance treatment;
the first evaluation module is used for evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the unbalance degree of the distribution transformer area after the three-phase load unbalance treatment.
Preferably, the first determining module is specifically configured to: the unbalance degree of the distribution area after the three-phase load unbalance treatment is calculated as follows:
B＝(L max -L min )/L max *100％
wherein B is unbalance degree of the distribution area after three-phase load unbalance treatment, L max For maximum phase current of distribution transformer area, L min Minimum phase current for the distribution block.
Preferably, the first evaluation module is specifically configured to:
determining the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment based on the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment;
if the unbalance degree of the distribution area after the three-phase load unbalance treatment meets the first constraint condition and/or the unbalance rate of the distribution area after the three-phase load unbalance treatment meets the second constraint condition, the three-phase load unbalance treatment effect of the distribution area is qualified, otherwise, the three-phase load unbalance treatment effect of the distribution area is not qualified.
Further, the calculation formula of the unbalance rate of the distribution area after the three-phase load unbalance treatment is as follows:
in the above formula, P is the unbalance rate of the distribution area after the three-phase load unbalance treatment, T is a preset period, and B is the unbalance degree of the distribution area after the three-phase load unbalance treatment.
Further, the first constraint condition is that an error between the unbalance degree and the lowest unbalance degree value of the distribution transformer area after three-phase load unbalance treatment is within a preset value;
the second constraint condition is that the unbalance rate of the distribution area after three-phase load unbalance treatment is not more than 1.
Preferably, the device comprises:
the second determining module is used for obtaining the frequency of the phase change switch actions of the distribution area in the three-phase load unbalance treatment process;
the second evaluation module is used for evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the frequency of the phase change switch actions of the distribution transformer area in the three-phase load unbalance treatment process.
Preferably, the second evaluation module is specifically configured to:
if the sum of the times of single phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a third constraint condition and/or the sum of the times of all phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a fourth constraint condition, the three-phase load unbalance treatment effect of the power distribution station area is qualified, otherwise, the three-phase load unbalance treatment effect of the power distribution station area is not qualified.
Further, the third constraint condition is that an error between the sum of the single phase change switch action times and the minimum single phase change switch action times of the distribution transformer area in the three-phase load unbalance treatment process is within a preset value;
the fourth constraint condition is that the error between the sum of the times of all the phase change switch actions and the minimum times of all the phase change switch actions in the three-phase load unbalance treatment process of the power distribution area is within a preset value.
Further, the preset value is 5%.
In a third aspect, there is provided a computer device comprising: one or more processors;
the processor is used for storing one or more programs;
and when the one or more programs are executed by the one or more processors, the three-phase load unbalance management effect evaluation method of the distribution transformer area is realized.
In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored, which when executed, implements the three-phase load imbalance treatment effect evaluation method for a power distribution area.
The technical scheme provided by the invention has at least one or more of the following beneficial effects:
the invention provides a three-phase load unbalance treatment effect evaluation method and device for a power distribution area, comprising the following steps: determining unbalance degree of the distribution transformer area after the three-phase load unbalance treatment based on the phase current of the distribution transformer area after the three-phase load unbalance treatment; and evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the unbalance degree of the distribution transformer area after the three-phase load unbalance treatment. According to the technical scheme provided by the invention, aiming at the system power quality control performance test, the power quality control performance of the system under different actual scenes is comprehensively considered, the power quality control effect of the low-voltage distribution transformer area can be checked, and a reference is provided for the intelligent construction of the low-voltage distribution transformer area.
Drawings
FIG. 1 is a schematic flow chart of main steps of a three-phase load imbalance treatment effect evaluation method for a power distribution area according to an embodiment of the present invention;
fig. 2 is a main structural block diagram of an apparatus for evaluating a three-phase load unbalance management effect of a distribution area according to an embodiment of the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As disclosed in the background art, the problem of three-phase imbalance is increasingly prominent, and uneven distribution of three-phase loads in a transformer area can lead to three-phase imbalance of distribution and transformation currents, and adverse factors can be generated for safe operation, high-quality power supply quality and economic operation of equipment of a power distribution network, including the problems of high operating temperature of a transformer, high neutral line current, high loss of electric energy, heavy overload of the transformer and low short voltage of power utilization users in the power distribution network. Along with the change of the load of the platform area, the three-phase unbalance also changes, so that the real effect can be obtained only by monitoring the load change normally and taking operation and maintenance measures in a targeted manner, the problems can be found and solved in time, and the disorder and repeated occurrence of the problems before and after the cleaning are avoided. In addition, the manual adjustment of the three-phase unbalanced load distribution which is commonly adopted at present requires a great amount of labor, material resources and time cost, and the power failure of branch lines of a platform area can be related when the adjustment range is large, and an automatic adjusting device is required to be additionally arranged and a corresponding control strategy is adopted to change the current situation.
In field applications, the abatement effects may vary due to environmental and human mishandling factors. Therefore, the effect of the electric energy quality control is necessary to be tested, evaluated and analyzed.
In order to improve the problems, the invention provides a three-phase load unbalance treatment effect evaluation method and device for a power distribution area, comprising the following steps: determining unbalance degree of the distribution transformer area after the three-phase load unbalance treatment based on the phase current of the distribution transformer area after the three-phase load unbalance treatment; and evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the unbalance degree of the distribution transformer area after the three-phase load unbalance treatment. According to the technical scheme provided by the invention, aiming at the system power quality control performance test, the power quality control performance of the system under different actual scenes is comprehensively considered, the power quality control effect of the low-voltage distribution transformer area can be checked, and a reference is provided for the intelligent construction of the low-voltage distribution transformer area. The above-described scheme is explained in detail below.
Example 1
Referring to fig. 1, fig. 1 is a schematic flow chart of main steps of a three-phase load imbalance treatment effect evaluation method for a power distribution area according to an embodiment of the present invention. As shown in fig. 1, the three-phase load imbalance treatment effect evaluation method for a power distribution area in the embodiment of the invention mainly includes the following steps:
step S101: determining unbalance degree of the distribution transformer area after the three-phase load unbalance treatment based on the phase current of the distribution transformer area after the three-phase load unbalance treatment;
step S102: and evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the unbalance degree of the distribution transformer area after the three-phase load unbalance treatment.
In this embodiment, the calculation formula of the unbalance degree of the distribution transformer area after the three-phase load unbalance treatment is as follows:
B＝(L max -L min )/L max *100％
wherein B is unbalance degree of the distribution area after three-phase load unbalance treatment, L max For maximum phase current of distribution transformer area, L min Minimum phase current for the distribution block.
In this embodiment, the evaluation of the effect of three-phase load imbalance management of the distribution transformer area based on the imbalance degree of the distribution transformer area after three-phase load imbalance management includes:
determining the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment based on the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment;
if the unbalance degree of the distribution area after the three-phase load unbalance treatment meets the first constraint condition and/or the unbalance rate of the distribution area after the three-phase load unbalance treatment meets the second constraint condition, the three-phase load unbalance treatment effect of the distribution area is qualified, otherwise, the three-phase load unbalance treatment effect of the distribution area is not qualified.
In one embodiment, the calculation formula of the unbalance rate of the distribution transformer area after three-phase load unbalance management is as follows:
in the above formula, P is the unbalance rate of the distribution area after the three-phase load unbalance treatment, T is a preset period, and B is the unbalance degree of the distribution area after the three-phase load unbalance treatment.
The first constraint condition is that the error between the unbalance degree and the lowest unbalance degree value of the distribution transformer area after three-phase load unbalance treatment is within a preset value;
the second constraint condition is that the unbalance rate of the distribution area after three-phase load unbalance treatment is not more than 1.
Further, the three-phase load unbalance management effect evaluation method of the power distribution area in the embodiment of the invention further comprises the following steps:
step S103: acquiring the frequency of phase change switch actions of a distribution area in the three-phase load unbalance treatment process;
step S104: and evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the frequency of the phase change switch actions of the distribution transformer area in the three-phase load unbalance treatment process.
In this embodiment, the evaluation of the three-phase load unbalance management effect of the power distribution area based on the number of the phase change switch actions of the power distribution area in the three-phase load unbalance management process includes:
if the sum of the times of single phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a third constraint condition and/or the sum of the times of all phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a fourth constraint condition, the three-phase load unbalance treatment effect of the power distribution station area is qualified, otherwise, the three-phase load unbalance treatment effect of the power distribution station area is not qualified.
In one embodiment, the third constraint condition is that an error between a sum of the single phase change switch action times and a minimum single phase change switch action time of the distribution transformer area in the three-phase load unbalance management process is within a preset value;
the fourth constraint condition is that the error between the sum of the times of all the phase change switch actions and the minimum times of all the phase change switch actions in the three-phase load unbalance treatment process of the power distribution area is within a preset value.
In one embodiment, the preset value is 5%.
Example 2
Based on the same inventive concept, the invention also provides a three-phase load unbalance treatment effect evaluation device of a power distribution station, as shown in fig. 2, the three-phase load unbalance treatment effect evaluation device of the power distribution station comprises:
the first determining module is used for determining the unbalance degree of the distribution area after the three-phase load unbalance treatment based on the phase current of the distribution area after the three-phase load unbalance treatment;
the first evaluation module is used for evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the unbalance degree of the distribution transformer area after the three-phase load unbalance treatment.
Preferably, the first determining module is specifically configured to: the unbalance degree of the distribution area after the three-phase load unbalance treatment is calculated as follows:
B＝(L max -L min )/L max *100％
wherein B is unbalance degree of the distribution area after three-phase load unbalance treatment, L max For maximum phase current of distribution transformer area, L min Minimum phase current for the distribution block.
Preferably, the first evaluation module is specifically configured to:
determining the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment based on the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment;
if the unbalance degree of the distribution area after the three-phase load unbalance treatment meets the first constraint condition and/or the unbalance rate of the distribution area after the three-phase load unbalance treatment meets the second constraint condition, the three-phase load unbalance treatment effect of the distribution area is qualified, otherwise, the three-phase load unbalance treatment effect of the distribution area is not qualified.
Further, the calculation formula of the unbalance rate of the distribution area after the three-phase load unbalance treatment is as follows:
in the above formula, P is the unbalance rate of the distribution area after the three-phase load unbalance treatment, T is a preset period, and B is the unbalance degree of the distribution area after the three-phase load unbalance treatment.
Further, the first constraint condition is that an error between the unbalance degree and the lowest unbalance degree value of the distribution transformer area after three-phase load unbalance treatment is within a preset value;
the second constraint condition is that the unbalance rate of the distribution area after three-phase load unbalance treatment is not more than 1.
Preferably, the device comprises:
the second determining module is used for obtaining the frequency of the phase change switch actions of the distribution area in the three-phase load unbalance treatment process;
the second evaluation module is used for evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the frequency of the phase change switch actions of the distribution transformer area in the three-phase load unbalance treatment process.
Preferably, the second evaluation module is specifically configured to:
if the sum of the times of single phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a third constraint condition and/or the sum of the times of all phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a fourth constraint condition, the three-phase load unbalance treatment effect of the power distribution station area is qualified, otherwise, the three-phase load unbalance treatment effect of the power distribution station area is not qualified.
Further, the third constraint condition is that an error between the sum of the single phase change switch action times and the minimum single phase change switch action times of the distribution transformer area in the three-phase load unbalance treatment process is within a preset value;
the fourth constraint condition is that the error between the sum of the times of all the phase change switch actions and the minimum times of all the phase change switch actions in the three-phase load unbalance treatment process of the power distribution area is within a preset value.
Further, the preset value is 5%.
Example 3
Based on the same inventive concept, the invention also provides a computer device comprising a processor and a memory for storing a computer program comprising program instructions, the processor for executing the program instructions stored by the computer storage medium. The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application SpecificIntegrated Circuit, ASIC), off-the-shelf Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc., which are the computational core and control core of the terminal adapted to implement one or more instructions, in particular to load and execute one or more instructions in a computer storage medium to implement the corresponding method flow or corresponding functions, to implement the steps of a method for assessing the effects of a three-phase load imbalance management of a power distribution area in the above embodiments.
Example 4
Based on the same inventive concept, the present invention also provides a storage medium, in particular, a computer readable storage medium (Memory), which is a Memory device in a computer device, for storing programs and data. It is understood that the computer readable storage medium herein may include both built-in storage media in a computer device and extended storage media supported by the computer device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also stored in the memory space are one or more instructions, which may be one or more computer programs (including program code), adapted to be loaded and executed by the processor. The computer readable storage medium herein may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. One or more instructions stored in a computer-readable storage medium may be loaded and executed by a processor to implement the steps of a method for assessing the effectiveness of a three-phase load imbalance treatment of a power distribution area in the above-described embodiments.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (20)
1. The three-phase load unbalance treatment effect evaluation method for the power distribution station area is characterized by comprising the following steps of:
determining unbalance degree of the distribution transformer area after the three-phase load unbalance treatment based on the phase current of the distribution transformer area after the three-phase load unbalance treatment;
and evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the unbalance degree of the distribution transformer area after the three-phase load unbalance treatment.
2. The method of claim 1, wherein the calculated imbalance of the distribution area after three-phase load imbalance management is as follows:
B＝(L max -L min )/L max *100％
wherein B is unbalance degree of the distribution area after three-phase load unbalance treatment, L max For maximum phase current of distribution transformer area, L min Minimum phase current for the distribution block.
3. The method of claim 1, wherein the evaluating the three-phase load imbalance management effect of the distribution block based on the imbalance degree of the distribution block after the three-phase load imbalance management comprises:
determining the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment based on the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment;
if the unbalance degree of the distribution area after the three-phase load unbalance treatment meets the first constraint condition and/or the unbalance rate of the distribution area after the three-phase load unbalance treatment meets the second constraint condition, the three-phase load unbalance treatment effect of the distribution area is qualified, otherwise, the three-phase load unbalance treatment effect of the distribution area is not qualified.
4. A method according to claim 3, wherein the unbalance rate of the distribution transformer area after three-phase load unbalance management is calculated as follows:
in the above formula, P is the unbalance rate of the distribution area after the three-phase load unbalance treatment, T is a preset period, and B is the unbalance degree of the distribution area after the three-phase load unbalance treatment.
5. A method according to claim 3, wherein the first constraint condition is that an error between an unbalance degree and a lowest unbalance degree of the distribution transformer area after three-phase load unbalance management is within a preset value;
the second constraint condition is that the unbalance rate of the distribution area after three-phase load unbalance treatment is not more than 1.
6. The method of claim 1, wherein the method comprises:
acquiring the frequency of phase change switch actions of a distribution area in the three-phase load unbalance treatment process;
and evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the frequency of the phase change switch actions of the distribution transformer area in the three-phase load unbalance treatment process.
7. The method of claim 1, wherein the evaluating the three-phase load imbalance management effect of the distribution transformer area based on the number of commutation switch actions of the distribution transformer area during the three-phase load imbalance management comprises:
if the sum of the times of single phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a third constraint condition and/or the sum of the times of all phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a fourth constraint condition, the three-phase load unbalance treatment effect of the power distribution station area is qualified, otherwise, the three-phase load unbalance treatment effect of the power distribution station area is not qualified.
8. The method of claim 7, wherein the third constraint is that an error between a sum of single commutation switch actions and a minimum number of single commutation switch actions in the three-phase load imbalance management process of the power distribution substation is within a preset value;
the fourth constraint condition is that the error between the sum of the times of all the phase change switch actions and the minimum times of all the phase change switch actions in the three-phase load unbalance treatment process of the power distribution area is within a preset value.
9. The method of claim 5 or 8, wherein the preset value is 5%.
10. A three-phase load imbalance treatment effect evaluation device for a power distribution area, the device comprising:
the first determining module is used for determining the unbalance degree of the distribution area after the three-phase load unbalance treatment based on the phase current of the distribution area after the three-phase load unbalance treatment;
the first evaluation module is used for evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the unbalance degree of the distribution transformer area after the three-phase load unbalance treatment.
11. The apparatus of claim 10, wherein the first determination module is specifically configured to: the unbalance degree of the distribution area after the three-phase load unbalance treatment is calculated as follows:
B＝(L max -L min )/L max *100％
wherein B is unbalance degree of the distribution area after three-phase load unbalance treatment, L max For maximum phase current of distribution transformer area, L min Minimum phase current for the distribution block.
12. The apparatus of claim 10, wherein the first evaluation module is specifically configured to:
determining the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment based on the unbalance rate of the distribution transformer area after the three-phase load unbalance treatment;
if the unbalance degree of the distribution area after the three-phase load unbalance treatment meets the first constraint condition and/or the unbalance rate of the distribution area after the three-phase load unbalance treatment meets the second constraint condition, the three-phase load unbalance treatment effect of the distribution area is qualified, otherwise, the three-phase load unbalance treatment effect of the distribution area is not qualified.
13. The apparatus of claim 12, wherein the unbalance rate of the distribution transformer area after the three-phase load unbalance management is calculated as follows:
in the above formula, P is the unbalance rate of the distribution area after the three-phase load unbalance treatment, T is a preset period, and B is the unbalance degree of the distribution area after the three-phase load unbalance treatment.
14. The apparatus of claim 12, wherein the first constraint is that an error between an imbalance degree and a lowest imbalance degree of the distribution transformer area after three-phase load imbalance treatment is within a preset value;
the second constraint condition is that the unbalance rate of the distribution area after three-phase load unbalance treatment is not more than 1.
15. The apparatus of claim 10, wherein the apparatus comprises:
the second determining module is used for obtaining the frequency of the phase change switch actions of the distribution area in the three-phase load unbalance treatment process;
the second evaluation module is used for evaluating the three-phase load unbalance treatment effect of the distribution transformer area based on the frequency of the phase change switch actions of the distribution transformer area in the three-phase load unbalance treatment process.
16. The apparatus of claim 10, wherein the second evaluation module is specifically configured to:
if the sum of the times of single phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a third constraint condition and/or the sum of the times of all phase change switch actions of the power distribution station area in the three-phase load unbalance treatment process meets a fourth constraint condition, the three-phase load unbalance treatment effect of the power distribution station area is qualified, otherwise, the three-phase load unbalance treatment effect of the power distribution station area is not qualified.
17. The apparatus of claim 16, wherein the third constraint is that an error between a sum of single commutation switch actions and a minimum number of single commutation switch actions of the distribution transformer substation during the three-phase load imbalance management process is within a preset value;
the fourth constraint condition is that the error between the sum of the times of all the phase change switch actions and the minimum times of all the phase change switch actions in the three-phase load unbalance treatment process of the power distribution area is within a preset value.
18. The apparatus of claim 14 or 17, wherein the preset value is 5%.
19. A computer device, comprising: one or more processors;
the processor is used for storing one or more programs;
the three-phase load unbalance management effect evaluation method of the power distribution station according to any one of claims 1 to 9 is implemented when the one or more programs are executed by the one or more processors.
20. A computer-readable storage medium, on which a computer program is stored, which, when executed, implements the three-phase load imbalance management effect evaluation method of the distribution transformer substation according to any one of claims 1 to 9.
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