Power distribution network comprehensive strategy loss reduction decision-making method and system

Abstract

The invention relates to the technical field of loss reduction decision, and particularly discloses a power distribution network comprehensive strategy loss reduction decision method and system, and the method comprises the steps: obtaining power distribution network operation line loss data and power distribution network operation voltage loss data, building a line loss coefficient model based on the line loss data, and carrying out the loss analysis, performing line loss reduction processing on the power distribution network, and outputting a line loss reduction scheme; meanwhile, a voltage loss coefficient model is established based on the voltage loss data, loss analysis is also carried out, and a voltage loss reduction scheme is output; and finally, in combination with the line loss coefficient and the voltage loss coefficient, analyzing a comprehensive loss index of the power distribution network, dividing loss grades, and outputting a comprehensive loss reduction scheme. Through a data analysis mode, the loss condition of the power distribution network is evaluated, a loss reduction strategy is provided in a targeted manner, the operation efficiency of the power distribution network is effectively improved, and powerful support is provided for intelligent management and optimization of the power distribution network.

Description

Technical Field

[0001] The present invention relates to the technical field of loss reduction decision-making, and in particular to a distribution network comprehensive strategy loss reduction decision-making method and system. Background Art

[0002] The distribution network refers to an electric power network that receives electric energy from the transmission network or regional power plants and distributes it to various types of users locally or step by step through distribution facilities. It is the part of the power system that is directly connected to the user, and is mainly responsible for the distribution and transmission of electric energy to ensure that users can obtain a stable and reliable power supply. As a key link in the power system, the operating efficiency and economy of the distribution network have a vital impact on the overall performance of the power system. However, with the continuous growth of electricity demand and the increasing complexity of the power grid structure, the loss problem in the distribution network has become more and more serious, becoming an important factor restricting the improvement of the economy and operating efficiency of the power grid. Therefore, how to effectively reduce the loss of the distribution network and improve the economy and operating efficiency of the power grid has become an important issue that needs to be urgently solved in the current power industry.

[0003] The traditional loss reduction decision-making method of the comprehensive strategy of distribution network mainly relies on traditional technical methods and means; although these methods can reduce losses to a certain extent, they have many limitations: first, the traditional method monitors and analyzes the loss of the distribution network through simple data statistics. However, this method lacks in-depth data analysis and model prediction, and cannot accurately identify and effectively deal with the loss problem. Secondly, the traditional method often only analyzes line loss or voltage loss separately, lacks research on comprehensive analysis of the two, and is difficult to comprehensively evaluate the loss status of the distribution network operation. The comprehensive loss index of the distribution network is not divided into loss levels, and there is a lack of refined loss reduction processing; in addition, the existing distribution network loss reduction technology often adopts a single technical means, such as optimizing the grid structure and improving equipment efficiency. Although these means can reduce losses to a certain extent, it is difficult to adapt to the loss reduction needs in different scenarios, resulting in unsatisfactory loss reduction effects and lack of systematic management means, which makes it difficult to fully carry out loss reduction work. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a distribution network comprehensive strategy loss reduction decision-making method and system to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a distribution network comprehensive strategy loss reduction decision method, comprising the following steps: Step S1: Acquire comprehensive data of distribution network operation loss, wherein the comprehensive data includes distribution network operation line loss data and distribution network operation voltage loss data; Step S2: Based on the acquired distribution network operation line loss data, a line loss coefficient model is established to calculate the distribution network line loss coefficient, and a loss analysis is performed on the distribution network line loss coefficient; Step S3: performing line loss reduction processing on the distribution network according to the loss analysis result of step S2, evaluating and analyzing the line loss of the distribution network after the loss reduction, and outputting a line loss reduction plan; Step S4: Based on the obtained distribution network operation voltage loss data, a voltage loss coefficient model is established to calculate the distribution network voltage loss coefficient, and a loss analysis is performed on the distribution network voltage loss coefficient; Step S5: performing voltage loss reduction processing on the distribution network according to the loss analysis result of step S4, evaluating and analyzing the voltage loss of the distribution network after the loss reduction, and outputting a voltage loss reduction plan; Step S6: Analyze the comprehensive loss index of the distribution network based on the line loss coefficient and the voltage loss coefficient of the distribution network, classify the comprehensive loss index of the distribution network into loss grades, and output a comprehensive loss reduction plan for the distribution network.

[0006] Preferably, in step S2, the calculation steps of establishing a line loss coefficient model to calculate the line loss coefficient of the distribution network are specifically as follows: Step S21: Calculate the line loss factor LF of the distribution network. The calculation model is as follows: Where Lr represents the load rate of the distribution network line, where P avg Expressed as the average load of the line, P max It is expressed as the maximum load of the line, and k is expressed as a constant; Step S22: Calculate the electric energy loss EL caused by the resistance of the distribution network components. The specific calculation model is: EL=3×(I max ) 2 ×LF×R×t×10 -3 , where I max It is represented as the maximum current passing through the distribution network components, LF is represented as the line loss factor of the distribution network, R is represented as the resistance of the distribution network components, and t is represented as the operating time of the distribution network line; Step S23: Calculate the distribution network line loss coefficient LLC, the specific calculation model is: Among them, LLC represents the line loss coefficient of the distribution network, Tw represents the temperature of the distribution network conductor, T max It is represented by the maximum temperature allowed to pass through the distribution network conductor, LF is represented by the line loss factor of the distribution network, EL is represented by the power loss caused by the resistance of the distribution network components, and Llr is represented by the line loss rate, where: ps represents the power supply of the distribution network, es represents the power sales of the distribution network, and e represents the natural constant; The specific contents of the loss analysis of the distribution network line loss coefficient are as follows: The line loss coefficient of the distribution network is extracted and compared with the preset line loss threshold. If the line loss coefficient of the distribution network is less than or equal to the preset line loss threshold, it is determined that the line loss of the distribution network is normal, that is, within the predetermined line loss range, indicating that no loss reduction processing is required, and the step loop is jumped out; if the line loss coefficient of the distribution network is greater than the preset line loss threshold, it is determined that the line loss of the distribution network is abnormal, and step S3 is further executed to perform loss reduction processing.

[0007] Preferably, in step S3, the specific content of performing line loss reduction processing on the distribution network according to the loss analysis result of step S2 is: The line loss of the distribution network is reduced by replacing the conductors. The loss reduction percentage after replacing the conductors is: Among them, R1 represents the wire resistance before the wire is replaced, and R2 represents the wire resistance after the wire is replaced; After replacing the distribution network conductor, the power saving and loss reduction is: Wherein, Lq represents the actual power loss before replacing the distribution network conductor.

[0008] Preferably, in step S3, the specific content of evaluating and analyzing the line loss of the distribution network after loss reduction is: based on the loss reduction and power saving ΔQ after replacing the distribution network conductor, analyzing the line loss deviation index λ1 of the distribution network after loss reduction, specifically: ΔQ0 represents the preset maximum loss reduction and power saving. If λ1 is less than or equal to the preset threshold value A, it is determined that the loss reduction treatment method for the distribution network line loss is reasonable and ideal, and the loss reduction treatment plan for this time is determined as the optimal line loss reduction plan, and the optimal line loss reduction plan is output. Otherwise, step S3 is looped again, the loss reduction treatment is performed again, and the loss reduction results are evaluated to find the optimal line loss reduction plan.

[0009] Preferably, in step S3, the calculation step of the distribution network voltage loss coefficient is specifically as follows: Step S41: Calculate the distribution network line current factor ICF, the calculation model is as follows: Among them, AP represents the active power of the distribution network line, RP represents the reactive power of the distribution network line, and U y It indicates the effective value of the line voltage during normal operation specified in the design of the distribution network line; Step S42: Calculate the voltage drop longitudinal component Uc, the calculation model is as follows: in, Expressed as the active power proportional factor, Expressed as reactive power proportional factor, Rl represents the resistance of the distribution network line, and X represents the reactance of the distribution network line; Step S43: Calculate the voltage loss coefficient VLC of the distribution network. The calculation model is as follows: Among them, VLC represents the voltage loss coefficient of the distribution network, and Uc represents the longitudinal component of the voltage drop; The specific contents of the loss analysis of the voltage loss coefficient of the distribution network are as follows: The voltage loss coefficient of the distribution network is extracted and compared with the preset voltage loss threshold. If the voltage loss coefficient of the distribution network is less than or equal to the preset voltage loss threshold, it is determined that the voltage loss of the distribution network is normal, that is, within the predetermined voltage loss range, indicating that no loss reduction treatment is required, and the step loop is jumped out; if the voltage loss coefficient of the distribution network is greater than the preset voltage loss threshold, it is determined that the voltage loss of the distribution network is abnormal, and step S5 is further executed to perform loss reduction treatment.

[0010] Preferably, in step S5, the specific content of performing voltage loss reduction processing on the distribution network according to the loss analysis result of step S4 is: The voltage loss of the distribution network is reduced by boosting and reducing the voltage of the distribution network. The specific contents are as follows: Boost the distribution network: the loss percentage ΔL after boosting the distribution network is: Among them, U N1 It is the rated voltage of the distribution network before voltage boost, U N2 It is expressed as the rated voltage of the distribution network after voltage boost; The power saving ΔA after the distribution network voltage is boosted is: Among them, Le represents the power loss before the distribution network is boosted; The distribution network is subjected to voltage reduction: the voltage reduction change percentage ΔS is: Among them, U S1 It is the bus voltage before the distribution network is stepped down, U S2 It represents the bus voltage after the distribution network is stepped down; The power saving ΔB after the distribution network voltage is reduced is:

[0011] Preferably, in step S5, the specific content of evaluating and analyzing the voltage loss of the distribution network after loss reduction is: analyzing the voltage loss deviation index λ2 of the distribution network after loss reduction based on the loss reduction amount ΔA after the distribution network is boosted and the loss reduction amount ΔB after the distribution network is reduced, specifically: ΔA0 represents the maximum loss reduction and energy saving of the preset boost processing, ΔB0 represents the maximum loss reduction and energy saving of the preset step-down processing, w1 and w2 represent the weights of the loss reduction and energy saving after the distribution network boosts and steps down the distribution network, respectively, and w1+w2=1.

[0012] Preferably, in step S6, the specific content of classifying the comprehensive loss index of the distribution network into loss levels is as follows: the specific content of classifying the comprehensive loss index of the distribution network into loss levels is as follows: comparing the comprehensive loss index of the distribution network with the preset comprehensive loss thresholds respectively; if the comprehensive loss index of the distribution network is less than the first preset comprehensive loss threshold, it is determined that the comprehensive loss of the distribution network belongs to a low loss level; if the comprehensive loss index of the distribution network is between the first preset comprehensive loss threshold and the second preset comprehensive loss threshold, it is determined that the comprehensive loss of the distribution network belongs to a medium loss level; if the comprehensive loss index of the distribution network is between the second preset comprehensive loss threshold and the third preset comprehensive loss threshold, it is determined that the comprehensive loss of the distribution network belongs to a high loss level; and loss reduction plans are formulated for distribution networks of different loss levels to form a loss reduction plan for distribution network loss levels; According to the distribution network loss level loss reduction plan, the distribution network line loss loss reduction plan output in step S3 and the distribution network voltage loss loss reduction plan output in step S5, a comprehensive distribution network loss reduction plan is formed and output.

[0013] To achieve the above object, the present invention provides the following technical solution: a distribution network comprehensive strategy loss reduction decision system, which implements the above distribution network comprehensive strategy loss reduction decision method, including: Distribution network loss data acquisition module: obtains the comprehensive data of distribution network operation loss, the comprehensive data includes the distribution network operation line loss data and the distribution network operation voltage loss data; Line loss data calculation module: based on the acquired distribution network operation line loss data, establish a line loss coefficient model to calculate the distribution network line loss coefficient, and perform loss analysis on the distribution network line loss coefficient; Line loss reduction analysis module: performs line loss reduction processing on the distribution network according to the loss analysis results of the line loss data calculation module, evaluates and analyzes the line loss of the distribution network after loss reduction, and outputs a line loss reduction plan; Voltage loss data calculation module: based on the obtained distribution network operation voltage loss data, a voltage loss coefficient model is established to calculate the distribution network voltage loss coefficient, and a loss analysis is performed on the distribution network voltage loss coefficient; Voltage loss analysis module: performs voltage loss reduction processing on the distribution network based on the loss analysis results of the voltage loss data calculation module, evaluates and analyzes the voltage loss of the distribution network after loss reduction, and outputs a voltage loss reduction plan; Comprehensive loss analysis module: Analyzes the comprehensive loss index of the distribution network based on the line loss coefficient and the voltage loss coefficient of the distribution network, classifies the comprehensive loss index of the distribution network into loss levels, and outputs a comprehensive loss reduction plan for the distribution network.

[0014] Technical effects and advantages of the present invention: 3. Through the comprehensive use of data analysis, the present invention can quickly and accurately identify the loss sources in the distribution network, so as to formulate and implement targeted loss reduction strategies, which not only shortens the formulation cycle of loss reduction plans, but also greatly improves the implementation efficiency of loss reduction work. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the method flow of the present invention.

[0017] Figure 2 It is a schematic diagram of the overall structure of the system of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1 See also Figure 1 As shown, the present invention provides a distribution network comprehensive strategy loss reduction decision method, comprising the following steps: Step S1: Acquire comprehensive data of distribution network operation loss, wherein the comprehensive data includes distribution network operation line loss data and distribution network operation voltage loss data; In this embodiment, it should be specifically explained that the distribution network operation line loss data includes the average load of the line, the maximum load of the line, the maximum current passing through the distribution network components, the resistance of the distribution network components, the operation time of the distribution network line, the temperature of the distribution network conductors, the power supply of the distribution network and the power sales of the distribution network; the distribution network operation voltage loss data includes the active power of the distribution network line, the reactive power of the distribution network line, the effective value of the line voltage during normal operation specified when the distribution network line is designed, the resistance of the distribution network line and the reactance of the distribution network line.

[0020] Step S2: Based on the acquired distribution network operation line loss data, a line loss coefficient model is established to calculate the distribution network line loss coefficient, and a loss analysis is performed on the distribution network line loss coefficient; In this embodiment, it should be specifically explained that in step S2, the calculation steps of establishing a line loss coefficient model to calculate the line loss coefficient of the distribution network are specifically as follows: Step S21: Calculate the line loss factor LF of the distribution network. The calculation model is as follows: Where Lr represents the load rate of the distribution network line, where Pavg represents the average load of the line, Pmax represents the maximum load of the line, and k represents a constant; Step S22: Calculate the electric energy loss EL caused by the resistance of the distribution network components. The specific calculation model is: EL=3×(I max ) 2 ×LF×R×t×10 -3 , where I max It is represented as the maximum current passing through the distribution network components, LF is represented as the line loss factor of the distribution network, R is represented as the resistance of the distribution network components, and t is represented as the operating time of the distribution network line; Step S23: Calculate the distribution network line loss coefficient LLC, the specific calculation model is: Among them, LLC represents the line loss coefficient of the distribution network, Tw represents the temperature of the distribution network conductor, T max It is represented by the maximum temperature allowed to pass through the distribution network conductor, LF is represented by the line loss factor of the distribution network, EL is represented by the power loss caused by the resistance of the distribution network components, and Llr is represented by the line loss rate, where: ps represents the power supply of the distribution network, es represents the power sales of the distribution network, and e represents the natural constant.

[0021] In this embodiment, it should be specifically explained that in step S2, the specific content of loss analysis of the distribution network line loss coefficient is: The line loss coefficient of the distribution network is extracted and compared with the preset line loss threshold. If the line loss coefficient of the distribution network is less than or equal to the preset line loss threshold, it is determined that the line loss of the distribution network is normal, that is, within the predetermined line loss range, indicating that no loss reduction processing is required, and the step loop is jumped out; if the line loss coefficient of the distribution network is greater than the preset line loss threshold, it is determined that the line loss of the distribution network is abnormal, and step S3 is further executed to perform loss reduction processing.

[0022] Step S3: performing line loss reduction processing on the distribution network according to the loss analysis result of step S2, evaluating and analyzing the line loss of the distribution network after the loss reduction, and outputting a line loss reduction plan; In this embodiment, it should be specifically explained that in step S3, the specific content of performing line loss reduction processing on the distribution network according to the loss analysis result of step S2 is: The line loss of the distribution network can be reduced by replacing the conductors. When the transmission load remains unchanged, the loss can be reduced by replacing the conductors and reducing the line resistance. The percentage of loss reduction after replacing the wire is: Among them, R1 represents the wire resistance before the wire is replaced, and R2 represents the wire resistance after the wire is replaced; After replacing the distribution network conductor, the power saving and loss reduction is: Wherein, Lq represents the actual power loss before replacing the distribution network conductor; In this embodiment, it should be specifically explained that in step S3, the specific content of evaluating and analyzing the line loss of the distribution network after the loss reduction is: Based on the power saving ΔQ after replacing the distribution network conductor, the line loss deviation index λ1 of the distribution network after loss reduction is analyzed, which is specifically: ΔQ0 represents the preset maximum loss reduction and power saving. If λ1 is less than or equal to the preset threshold value A, it is determined that the loss reduction treatment method for the distribution network line loss is reasonable and ideal, and the loss reduction treatment plan for this time is determined as the optimal line loss reduction plan, and the optimal line loss reduction plan is output. Otherwise, step S3 is looped again, the loss reduction treatment is performed again, and the loss reduction results are evaluated to find the optimal line loss reduction plan.

[0023] In this embodiment, it should be specifically explained that the method for reducing line losses in the distribution network also includes reducing line losses by increasing the conductor cross-section and reducing line resistance; reducing line losses by optimizing the line, shortening the line length and reducing the total line resistance; installing reactive power compensation devices at appropriate locations in the distribution network (such as near nodes with large reactive power loads); guiding users to reasonably arrange their electricity usage time and reduce the peak-valley difference by implementing peak-valley electricity price economic means; and reasonably arranging the opening and closing states of the interconnection switches according to the real-time load, line status, etc. of the distribution network by regularly analyzing and optimizing the operation mode of the power grid.

[0024] Step S4: Based on the obtained distribution network operation voltage loss data, a voltage loss coefficient model is established to calculate the distribution network voltage loss coefficient, and a loss analysis is performed on the distribution network voltage loss coefficient; In this embodiment, it should be specifically explained that in step S3, the calculation step of the distribution network voltage loss coefficient is specifically as follows: Step S41: Calculate the distribution network line current factor ICF, the calculation model is as follows: Among them, AP represents the active power of the distribution network line, RP represents the reactive power of the distribution network line, and U y It indicates the effective value of the line voltage during normal operation specified in the design of the distribution network line; Step S42: Calculate the voltage drop longitudinal component Uc, the calculation model is as follows: in, Expressed as the active power proportional factor, Expressed as reactive power proportional factor, Rl represents the resistance of the distribution network line, and X represents the reactance of the distribution network line; Step S43: Calculate the voltage loss coefficient VLC of the distribution network. The calculation model is as follows: Among them, VLC represents the voltage loss coefficient of the distribution network, and Uc represents the longitudinal component of the voltage drop.

[0025] In this embodiment, it should be specifically explained that the longitudinal component of voltage drop refers to the component of the voltage drop along the longitudinal direction (active direction) of the line in the phasor diagram when the current flows through the line due to the existence of line resistance and reactance. This component is mainly caused by the active power loss of the line (through resistance) and the voltage drop caused by reactive power (through reactance).

[0026] In this embodiment, it should be specifically explained that smart meters are widely used in modern power distribution networks, and they can also directly measure active power and reactive power. Smart meters have a special metering chip inside that can perform digital signal processing such as fast Fourier transform (FFT) on the sampling signals of voltage and current. By analyzing the voltage and current signals in the frequency domain, the fundamental and harmonic components are distinguished, so that the active power and reactive power can be accurately calculated. For example, for non-sinusoidal voltage and current waveforms containing harmonics, smart meters can calculate according to the corresponding harmonic power theory, avoiding the calculation error based on the simple sine wave assumption.

[0027] In this embodiment, it should be specifically explained that in step S3, the specific content of the loss analysis of the voltage loss coefficient of the distribution network is: The voltage loss coefficient of the distribution network is extracted and compared with the preset voltage loss threshold. If the voltage loss coefficient of the distribution network is less than or equal to the preset voltage loss threshold, it is determined that the voltage loss of the distribution network is normal, that is, within the predetermined voltage loss range, indicating that no loss reduction treatment is required, and the step loop is jumped out; if the voltage loss coefficient of the distribution network is greater than the preset voltage loss threshold, it is determined that the voltage loss of the distribution network is abnormal, and step S5 is further executed to perform loss reduction treatment.

[0028] Step S5: performing voltage loss reduction processing on the distribution network according to the loss analysis result of step S4, evaluating and analyzing the voltage loss of the distribution network after the loss reduction, and outputting a voltage loss reduction plan; In this embodiment, it should be specifically explained that in step S5, the specific content of performing voltage loss reduction processing on the distribution network according to the loss analysis result of step S4 is: The voltage loss of the distribution network is reduced by boosting and reducing the voltage of the distribution network. The specific contents are as follows: Boost the distribution network: the loss percentage ΔL after boosting the distribution network is: Among them, U N1 It is the rated voltage of the distribution network before voltage boost, U N2 It is expressed as the rated voltage of the distribution network after voltage boost; The power saving ΔA after the distribution network voltage is boosted is: Among them, Le represents the power loss before the distribution network is boosted; The distribution network is subjected to voltage reduction: the voltage reduction change percentage ΔS is: Among them, U S1 It is the bus voltage before the distribution network is stepped down, U S2 It represents the bus voltage after the distribution network is stepped down; The power saving ΔB after the distribution network voltage is reduced is: In this embodiment, it should be specifically stated that the bus voltage refers to the voltage on the common conductor (i.e., bus) connecting multiple power sources or loads in the power system. In the power system, the bus usually serves as a connecting hub between the internal circuits of the power station and the substation, and plays the role of collecting and distributing electric energy. The bus voltage is one of the key parameters for evaluating the operating status, power quality and stability of the power system. In order to ensure the normal operation of the power system, the bus voltage is usually monitored in real time through various instruments and automation systems. Common measurement methods include using a voltage transformer (PT) to convert high voltage into a low voltage signal, which is convenient for instruments to read and process. In addition, digital technology is widely used in modern power systems, such as electronic transformers in smart substations, which can more accurately obtain bus voltage information and transmit it to the control center through a communication network.

[0029] In this embodiment, it should be specifically explained that in step S5, the specific content of evaluating and analyzing the voltage loss of the distribution network after the loss reduction is: Based on the loss-reducing power saving ΔA after the distribution network voltage is boosted and the loss-reducing power saving ΔB after the distribution network voltage is reduced, the voltage loss deviation index λ2 of the distribution network after loss reduction is analyzed, which is specifically: ΔA0 represents the maximum loss reduction and energy saving of the preset boost processing, ΔB0 represents the maximum loss reduction and energy saving of the preset buck processing, w1 and w2 represent the weights of the loss reduction and energy saving after the distribution network boosts and the loss reduction and energy saving after the distribution network bucks, respectively, and w1+w2=1; If λ2 is less than or equal to the preset threshold value B, it is determined that the voltage loss reduction processing method of the distribution network is reasonable and ideal, and the current loss reduction processing scheme is determined as the optimal voltage loss loss reduction scheme, and the optimal voltage loss reduction scheme is output. Otherwise, step S5 is looped again, the loss reduction processing is performed again, and the loss reduction results are evaluated to find the optimal voltage loss loss reduction scheme.

[0030] Step S6: Analyze the comprehensive loss index of the distribution network based on the line loss coefficient and the voltage loss coefficient of the distribution network, classify the comprehensive loss index of the distribution network into loss grades, and output a comprehensive loss reduction plan for the distribution network.

[0031] In this embodiment, it should be specifically explained that in step S6, analyzing the comprehensive loss index of the distribution network is specifically: Among them, LAI represents the comprehensive loss index of the distribution network, LLC represents the line loss coefficient of the distribution network, VLC represents the voltage loss coefficient of the distribution network, μ1 and μ2 represent the weights of the line loss coefficient of the distribution network and the voltage loss coefficient of the distribution network, respectively, and μ1+μ2=1; In this embodiment, it should be specifically explained that in step S6, the specific content of classifying the comprehensive loss index of the distribution network into loss levels is: comparing the comprehensive loss index of the distribution network with the preset comprehensive loss thresholds respectively; if the comprehensive loss index of the distribution network is less than the first preset comprehensive loss threshold, it is determined that the comprehensive loss of the distribution network belongs to the low loss level; if the comprehensive loss index of the distribution network is between the first preset comprehensive loss threshold and the second preset comprehensive loss threshold, it is determined that the comprehensive loss of the distribution network belongs to the medium loss level; if the comprehensive loss index of the distribution network is between the second preset comprehensive loss threshold and the third preset comprehensive loss threshold, it is determined that the comprehensive loss of the distribution network belongs to the high loss level; and loss reduction plans are formulated for distribution networks of different loss levels to form a loss reduction plan for distribution network loss levels; According to the distribution network loss level loss reduction plan, the distribution network line loss loss reduction plan output in step S3 and the distribution network voltage loss loss reduction plan output in step S5, a comprehensive distribution network loss reduction plan is formed and output.

[0032] Example 2 See also Figure 2 As shown, the present invention provides a distribution network comprehensive strategy loss reduction decision system, including a distribution network loss data acquisition module, a line loss data calculation module, a line loss reduction analysis module, a voltage loss data calculation module, a voltage loss reduction analysis module and a comprehensive loss analysis module.

[0033] The distribution network loss data acquisition module acquires the comprehensive data of distribution network operation loss, wherein the comprehensive data includes the distribution network operation line loss data and the distribution network operation voltage loss data; The line loss data calculation module establishes a line loss coefficient model based on the acquired distribution network operation line loss data to calculate the distribution network line loss coefficient, and performs loss analysis on the distribution network line loss coefficient; The line loss reduction analysis module performs line loss reduction processing on the distribution network according to the loss analysis result of the line loss data calculation module, evaluates and analyzes the line loss of the distribution network after the loss reduction, and outputs a line loss reduction plan; The voltage loss data calculation module obtains the distribution network operation voltage loss data, establishes a voltage loss coefficient model to calculate the distribution network voltage loss coefficient, and performs loss analysis on the distribution network voltage loss coefficient; The voltage loss analysis module performs voltage loss processing on the distribution network according to the loss analysis result of the voltage loss data calculation module, evaluates and analyzes the voltage loss of the distribution network after the loss reduction, and outputs a voltage loss reduction plan; The comprehensive loss analysis module analyzes the comprehensive loss index of the distribution network based on the line loss coefficient of the distribution network and the voltage loss coefficient of the distribution network, classifies the comprehensive loss index of the distribution network into loss grades, and outputs a comprehensive loss reduction plan for the distribution network.

[0034] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0035] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A distribution network comprehensive strategy loss reduction decision method, characterized in that: The following steps are involved: Step S1: Acquire comprehensive data of distribution network operation loss, wherein the comprehensive data includes distribution network operation line loss data and distribution network operation voltage loss data; Step S2: Based on the acquired distribution network operation line loss data, a line loss coefficient model is established to calculate the distribution network line loss coefficient, and a loss analysis is performed on the distribution network line loss coefficient; Step S3: performing line loss reduction processing on the distribution network according to the loss analysis result of step S2, evaluating and analyzing the line loss of the distribution network after the loss reduction, and outputting a line loss reduction plan; Step S4: Based on the obtained distribution network operation voltage loss data, a voltage loss coefficient model is established to calculate the distribution network voltage loss coefficient, and a loss analysis is performed on the distribution network voltage loss coefficient; Step S5: performing voltage loss reduction processing on the distribution network according to the loss analysis result of step S4, evaluating and analyzing the voltage loss of the distribution network after the loss reduction, and outputting a voltage loss reduction plan; Step S6: Analyze the comprehensive loss index of the distribution network based on the line loss coefficient and the voltage loss coefficient of the distribution network, classify the comprehensive loss index of the distribution network into loss grades, and output a comprehensive loss reduction plan for the distribution network.

2. A distribution network comprehensive strategy loss reduction decision method according to claim 1, characterized in that: In step S2, the calculation steps of establishing a line loss coefficient model to calculate the line loss coefficient of the distribution network are specifically as follows: Step S21: Calculate the line loss factor LF of the distribution network. The calculation model is as follows: Where Lr represents the load rate of the distribution network line, where P avg Expressed as the average load of the line, P max It is expressed as the maximum load of the line, and k is expressed as a constant; Step S22: Calculate the electric energy loss EL caused by the resistance of the distribution network components. The specific calculation model is: EL=3×(I max ) 2 ×LF×R×t×10 -3 , where I max It is represented as the maximum current passing through the distribution network components, LF is represented as the line loss factor of the distribution network, R is represented as the resistance of the distribution network components, and t is represented as the operating time of the distribution network line; Step S23: Calculate the distribution network line loss coefficient LLC, the specific calculation model is: Among them, LLC represents the line loss coefficient of the distribution network, Tw represents the temperature of the distribution network conductor, T max It is represented by the maximum temperature allowed to pass through the distribution network conductor, LF is represented by the line loss factor of the distribution network, EL is represented by the power loss caused by the resistance of the distribution network components, and Llr is represented by the line loss rate, where: ps represents the power supply of the distribution network, es represents the power sales of the distribution network, and e represents the natural constant; The specific contents of the loss analysis of the distribution network line loss coefficient are as follows: The line loss coefficient of the distribution network is extracted and compared with the preset line loss threshold. If the line loss coefficient of the distribution network is less than or equal to the preset line loss threshold, it is determined that the line loss of the distribution network is normal, that is, within the predetermined line loss range, indicating that no loss reduction processing is required, and the step loop is jumped out; if the line loss coefficient of the distribution network is greater than the preset line loss threshold, it is determined that the line loss of the distribution network is abnormal, and step S3 is further executed to perform loss reduction processing.

3. A distribution network comprehensive strategy loss reduction decision method according to claim 1, characterized in that: In step S3, the specific contents of performing line loss reduction processing on the distribution network according to the loss analysis result of step S2 are as follows: The line loss of the distribution network is reduced by replacing the conductors. The loss reduction percentage after replacing the conductors is: Among them, R1 represents the wire resistance before the wire is replaced, and R2 represents the wire resistance after the wire is replaced; After replacing the distribution network conductor, the power loss reduction and energy saving are: Wherein, Lq represents the actual power loss before replacing the distribution network conductor.

4. A distribution network comprehensive strategy loss reduction decision method according to claim 1, characterized in that: In step S3, the specific contents of evaluating and analyzing the line loss of the distribution network after loss reduction are as follows: Based on the power saving ΔQ after replacing the distribution network conductor, the line loss deviation index λ1 of the distribution network after loss reduction is analyzed, which is specifically: ΔQ0 represents the preset maximum loss reduction and power saving. If λ1 is less than or equal to the preset threshold value A, it is determined that the loss reduction treatment method for the distribution network line loss is reasonable and ideal, and the loss reduction treatment plan for this time is determined as the optimal line loss reduction plan, and the optimal line loss reduction plan is output. Otherwise, step S3 is looped again, the loss reduction treatment is performed again, and the loss reduction results are evaluated to find the optimal line loss reduction plan.

5. A distribution network comprehensive strategy loss reduction decision method according to claim 1, characterized in that: In step S3, the calculation steps of the distribution network voltage loss coefficient are specifically as follows: Step S41: Calculate the distribution network line current factor ICF, the calculation model is as follows: Among them, AP represents the active power of the distribution network line, RP represents the reactive power of the distribution network line, and U y It indicates the effective value of the line voltage during normal operation specified in the design of the distribution network line; Step S42: Calculate the voltage drop longitudinal component Uc, the calculation model is as follows: in, Expressed as the active power proportional factor, Expressed as reactive power proportional factor, Rl represents the resistance of the distribution network line, and X represents the reactance of the distribution network line; Step S43: Calculate the voltage loss coefficient VLC of the distribution network. The calculation model is as follows: Among them, VLC represents the voltage loss coefficient of the distribution network, and Uc represents the longitudinal component of the voltage drop; The specific contents of the loss analysis of the voltage loss coefficient of the distribution network are as follows: The voltage loss coefficient of the distribution network is extracted and compared with the preset voltage loss threshold. If the voltage loss coefficient of the distribution network is less than or equal to the preset voltage loss threshold, it is determined that the voltage loss of the distribution network is normal, that is, within the predetermined voltage loss range, indicating that no loss reduction treatment is required, and the step loop is jumped out; if the voltage loss coefficient of the distribution network is greater than the preset voltage loss threshold, it is determined that the voltage loss of the distribution network is abnormal, and step S5 is further executed to perform loss reduction treatment.

6. A distribution network comprehensive strategy loss reduction decision method according to claim 1, characterized in that: In step S5, the specific contents of performing voltage loss reduction processing on the distribution network according to the loss analysis result of step S4 are as follows: The voltage loss of the distribution network is reduced by boosting and reducing the voltage of the distribution network. The specific contents are as follows: Boost the distribution network: the loss percentage ΔL after boosting the distribution network is: Among them, U N1 It is the rated voltage of the distribution network before voltage boost, U N2 It represents the rated voltage of the distribution network after voltage boost; The power saving ΔA after the distribution network voltage is boosted is: Among them, Le represents the power loss before the distribution network is boosted; The distribution network is subjected to voltage reduction: the voltage reduction change percentage ΔS is: Among them, U S1 It is the bus voltage before the distribution network is stepped down, U S2 It represents the bus voltage after the distribution network is stepped down; The power saving ΔB after the distribution network voltage is reduced is:

7. A distribution network comprehensive strategy loss reduction decision method according to claim 1, characterized in that: In step S5, the specific contents of evaluating and analyzing the voltage loss of the distribution network after loss reduction are as follows: Based on the loss-reducing power saving ΔA after the distribution network voltage is boosted and the loss-reducing power saving ΔB after the distribution network voltage is reduced, the voltage loss deviation index λ2 of the distribution network after loss reduction is analyzed, which is specifically: ΔA0 represents the maximum loss reduction and energy saving of the preset boost processing, ΔB0 represents the maximum loss reduction and energy saving of the preset step-down processing, w1 and w2 represent the weights of the loss reduction and energy saving after the distribution network boosts and steps down the distribution network, respectively, and w1+w2=1.

8. A distribution network comprehensive strategy loss reduction decision method according to claim 1, characterized in that: In the step S6, the specific content of the loss level classification of the comprehensive loss index of the distribution network is as follows: the specific content of the loss level classification of the comprehensive loss index of the distribution network is as follows: the comprehensive loss index of the distribution network is compared with the preset comprehensive loss threshold value respectively; if the comprehensive loss index of the distribution network is less than the first preset comprehensive loss threshold value, it is determined that the comprehensive loss of the distribution network belongs to the low loss level; if the comprehensive loss index of the distribution network is between the first preset comprehensive loss threshold value and the second preset comprehensive loss threshold value, it is determined that the comprehensive loss of the distribution network belongs to the medium loss level; if the comprehensive loss index of the distribution network is between the second preset comprehensive loss threshold value and the third preset comprehensive loss threshold value, it is determined that the comprehensive loss of the distribution network belongs to the high loss level; and loss reduction plans are formulated for distribution networks of different loss levels to form a loss reduction plan for distribution network loss levels; According to the distribution network loss level loss reduction plan, the distribution network line loss loss reduction plan output in step S3 and the distribution network voltage loss loss reduction plan output in step S5, a comprehensive distribution network loss reduction plan is formed and output.

9. A distribution network comprehensive strategy loss reduction decision system, used to implement a distribution network comprehensive strategy loss reduction decision method as described in any one of claims 1 to 8, characterized in that: include: Distribution network loss data acquisition module: obtains the comprehensive data of distribution network operation loss, the comprehensive data includes the distribution network operation line loss data and the distribution network operation voltage loss data; Line loss data calculation module: based on the acquired distribution network operation line loss data, establish a line loss coefficient model to calculate the distribution network line loss coefficient, and perform loss analysis on the distribution network line loss coefficient; Line loss reduction analysis module: performs line loss reduction processing on the distribution network according to the loss analysis results of the line loss data calculation module, evaluates and analyzes the line loss of the distribution network after loss reduction, and outputs a line loss reduction plan; Voltage loss data calculation module: based on the obtained distribution network operation voltage loss data, a voltage loss coefficient model is established to calculate the distribution network voltage loss coefficient, and a loss analysis is performed on the distribution network voltage loss coefficient; Voltage loss analysis module: performs voltage loss reduction processing on the distribution network based on the loss analysis results of the voltage loss data calculation module, evaluates and analyzes the voltage loss of the distribution network after loss reduction, and outputs a voltage loss reduction plan; Comprehensive loss analysis module: Analyzes the comprehensive loss index of the distribution network based on the line loss coefficient and the voltage loss coefficient of the distribution network, classifies the comprehensive loss index of the distribution network into loss levels, and outputs a comprehensive loss reduction plan for the distribution network.

Images