A method and system for evaluating energy saving and loss reduction adaptability based on medium and low voltage lines

Abstract

The present invention discloses an energy-saving and loss-reduction adaptability evaluation method and system based on medium and low voltage lines. The method includes: collecting basic data and operation data of different distribution network distribution lines and transformers in different areas and user power consumption; calculating the distribution network line loss in the medium voltage area, the distribution network line loss in the low voltage area and the line loss in the substation area according to the operation data, and preliminarily forming the influencing factors of the line loss in each area; monitoring and recording three types of line loss rates, and judging whether the line loss rate exceeds the set threshold, analyzing the corresponding line loss rate exceeding the set threshold, and determining one or more influencing factors that cause high losses in multiple distribution networks in different areas; predicting and judging the specific reasons for the high losses of the monitored real-time high-loss line loss rate type, and building energy-saving and loss-reduction measures based on this. The method comprehensively considers multiple factors such as the operating characteristics, equipment status, and environmental factors of medium and low voltage lines to achieve accurate evaluation and optimization of energy-saving and loss-reduction measures for medium voltage lines.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid energy saving, and in particular to a method and system for evaluating the energy saving and loss reduction adaptability of a medium voltage line. Background Art

[0002] With the continuous growth of electricity demand, medium and low voltage lines, as an important part of the power system, their energy efficiency level is directly related to the economic operation and sustainable development of the power system.

[0003] In my country's existing power system, the high-voltage transmission and transformation system above 35kv is mainly responsible for long-distance transmission of electric energy, while the medium-voltage level of 10kV and 380 / 220V is the main body of the distribution system and has the closest relationship with users. In the process of transmitting electric energy through wires, switches, transformers and other equipment, power loss (active and reactive power) will be generated, and energy loss (active and reactive power) will be generated in the corresponding time. The line loss rate of the distribution system refers to the ratio of the active power lost in the distribution process to the total power obtained by the system within a period of time.

[0004] The losses of medium and low voltage distribution networks account for 3 / 4 of the total network losses. At the same time, according to the approximate composition ratio of power grid losses in different regions, it can be calculated that about a quarter of the losses are in the transmission system, and three quarters of the losses are in the distribution system. Among them, the power loss of high-voltage transmission lines and high-voltage transformers is generally less than 10%, while the losses of medium and low voltage distribution systems account for more than 70%. Therefore, medium and low voltage distribution systems will be the top priority for energy saving and loss reduction of power grids.

[0005] For the substation, there is a close relationship between the line and the substation. The line transmits electric energy from the power plant to each substation, and the substation further distributes the electric energy to each user. The voltage level of the line is generally higher than that of the substation, because the line needs to transmit electric energy while overcoming factors such as transmission loss and line impedance. The voltage level of the substation is suitable for supplying to users and is low voltage. The relationship between the line and the substation can be illustrated by a simple example: suppose there is a power station that transmits electric energy to a substation through a high-voltage line. The substation reduces the voltage through a transformer and then distributes it to each substation through a medium-voltage line. Each substation then reduces the voltage to a low voltage suitable for users through a distribution transformer and supplies the electric energy to users. In this way, the entire process from power generation to power consumption is completed, so the substation involves two voltage levels, medium voltage and low voltage.

[0006] Substation line loss refers to the energy loss caused by the resistance of the cable line itself, additional cable loss and other factors in the process of transmitting electric energy from the transformer station to the user's electrical equipment. Substation line loss is an important indicator in the operation of the power grid, which is directly related to the power supply quality and efficiency of the power grid.

[0007] The line loss rate of the substation area is an indicator used to measure the degree of line loss in the substation area, usually expressed as a percentage. Its calculation formula is: line loss rate = (total line loss / power supply) * 100%.

[0008] A high line loss rate in the substation area means that the loss of electric energy in the transmission process is large, which may indicate problems such as aging of power grid equipment, abnormal line operation, and low efficiency of user power equipment. Therefore, reducing the line loss rate in the substation area is of great significance for improving the efficiency of power grid operation, reducing operating costs and saving energy.

[0009] However, relatively few existing technologies have studied the impact of substation line losses on energy saving and loss reduction, and even fewer have studied the correlation between substation line losses and technical line losses of medium-voltage line losses and low-voltage line losses. This has led to the fact that existing technologies are all explored in a single field, and the solutions used for line loss management are very complex, using a large number of formulas and complex algorithms, which is actually not practical for daily work. For staff, simplicity, effectiveness and accuracy are the key.

[0010] For example, the invention patent with publication number CN106208043B discloses a method for identifying key energy-consuming links in medium and low voltage distribution networks. The single factor analysis method can be used to quantitatively analyze the influence of various factors on the loss of the distribution network and the degree of influence. If only the degree of influence of each factor on the loss and the ranking process are required, or if the single factor change analysis method is not suitable due to limitations of data collection and calculation conditions, the key links of the distribution network loss can be determined by the improved grey correlation analysis method. Although the case focuses on multiple factors, the method used is relatively complicated, and it considers medium and low voltage together. However, in actual work and even in relevant standards, it is known that the factors and standards affecting the line loss of medium and low voltage are different, so the accuracy is difficult to guarantee;

[0011] And the invention patent with publication number CN117175586A discloses a medium-voltage line multi-scenario energy-saving and loss-reduction processing system, which uses conventional formulas to calculate the load of existing transmission lines and generate rectification plans to improve the energy-saving and loss-reduction processing of medium-voltage lines at the lowest cost. However, it only focuses on a single factor, lacks comprehensiveness and adaptability, and it is difficult to achieve effective evaluation and optimization of energy-saving and loss-reduction measures. Summary of the invention

[0012] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a medium-voltage line energy-saving and loss-reduction adaptability assessment method, which solves the problem of poor energy efficiency assessment and optimization effects caused by considering medium and low voltage line losses separately and ignoring substation line losses in the process of medium and low voltage energy-saving and loss-reduction. The present invention also provides a medium-voltage line energy-saving and loss-reduction adaptability assessment system.

[0013] Technical solution: According to a first aspect of the present invention, a method for evaluating the energy saving and loss reduction adaptability based on medium and low voltage lines is provided, the method comprising:

[0014] S1 collects basic data and operation data of distribution lines and transformers of different distribution networks in different areas, as well as the power consumption of users;

[0015] S2 calculates the real-time distribution network line loss in the medium voltage area, the real-time distribution network line loss in the low voltage area, and the real-time line loss in the substation area according to the operation data, and preliminarily forms the influencing factors of the line loss in each area;

[0016] S3 monitors and records three types of line loss rates, namely, the line loss rate in the medium voltage area, the line loss rate in the low voltage area, and the line loss rate in the substation area, and determines whether it exceeds the set threshold, analyzes the corresponding line loss rate that exceeds the set threshold, and determines one or more influencing factors that cause high losses in multiple distribution networks in different areas;

[0017] S4 sorts the influencing factors that cause high losses in different distribution networks in different regions from high to low according to the frequency, and then obtains the key influencing factors of the medium voltage area, the key influencing factors of the low voltage area and the key influencing factors of the substation area, and compares the key influencing factors of different areas in the same area with the influencing factor set corresponding to the line loss rate type that causes high losses in the target area;

[0018] S5 uses key influencing factors and the real-time high-loss line loss rate types monitored to predict and determine the specific causes of high losses, and builds energy-saving and loss-reduction measures based on this.

[0019] Furthermore, the method further comprises:

[0020] Conduct adaptability analysis on the constructed energy-saving and loss-reduction measures, input the energy-saving and loss-reduction measures to be evaluated into the analysis model, and obtain the adaptability score of the measures through calculation and analysis of the analysis model. The higher the score, the greater the improvement of the measures on energy-saving and loss-reduction of medium-voltage lines, and the better the adaptability;

[0021] According to the adaptability scoring results, different energy-saving and loss-reduction measures are compared and ranked to provide a basis for formulating optimization strategies.

[0022] Further, including:

[0023] The step S3 specifically includes:

[0024] S31 sets the threshold corresponding to the medium voltage line loss rate in the target area to α, the threshold corresponding to the low voltage line loss rate to β, and the threshold corresponding to the line loss rate in the substation area to γ, and β>γ>α;

[0025] If S32 detects that the medium voltage line loss rate of the current distribution network is lower than α, the low voltage line loss rate is lower than β, or / and the area line loss rate is lower than γ, it is recorded as low loss, and monitoring continues. Otherwise,

[0026] If it is monitored that the medium voltage line loss rate in the current distribution network is greater than or equal to α, and the low voltage line loss rate is lower than β and the area line loss rate is not greater than γ, then the influencing factors of the medium voltage area itself are considered, and the influencing factors of the medium voltage area itself include the medium voltage line and the transformer on the medium voltage side; otherwise,

[0027] If the low-voltage line loss rate is greater than or equal to β, and the area line loss rate is greater than or equal to γ, and the medium-voltage line loss rate is lower than α, first check the common influencing factors of the low-voltage area and the area, and record the relevant influencing factors. Otherwise,

[0028] If the low-voltage line loss rate is greater than or equal to β, and the area line loss rate is lower than γ, the influencing factors of the low-voltage area itself are considered, and the influencing factors of the low-voltage area itself include the low-voltage line and the transformer on the low-voltage side; otherwise,

[0029] If the line loss rate of the transformer area is greater than or equal to γ, the low-voltage line loss rate is lower than β, and the medium-voltage line loss rate is not less than α, then the common influencing factors of the transformer area and the medium-voltage area are considered and recorded. Otherwise,

[0030] If the line loss rate of the substation is greater than or equal to γ, the low-voltage line loss rate is lower than β, and the medium-voltage line loss rate is lower than α, then the influencing factors of the substation itself are considered, and the influencing factors of the substation itself include the substation-related equipment; otherwise,

[0031] If the line loss rate of the substation area is greater than or equal to γ, the low-voltage line loss rate is greater than or equal to β, and the medium-voltage line loss rate is greater than or equal to α, then they are all high losses. First, check the common influencing factors in the medium-voltage area, low-voltage area, and substation area, and record the relevant influencing factors;

[0032] S33 uses the different monitored data to cycle the judgment in step S32, and then determines one or more influencing factors that cause high losses in multiple distribution networks in different areas.

[0033] Further, including:

[0034] The step S4 comprises:

[0035] S41 sets the number of distribution networks corresponding to the target area, and counts the influencing factors set of high loss in the medium voltage area, the influencing factors set of high loss in the low voltage area, and the influencing factors set of high loss in the transformer area corresponding to different time periods of each distribution network, thereby obtaining the influencing factors of high loss in different areas of the target area;

[0036] S42 sorts the frequencies of the influencing factors of the target area in different time periods from high to low, and then obtains the corresponding key influencing factors, and the same influencing factors in the influencing factor set of high loss in the medium-voltage area, the influencing factor set of high loss in the low-voltage area and the influencing factor set of high loss in the substation are used as the common influencing factors of the three to form a first common influencing factor set, the same influencing factors in the influencing factor set of high loss in the medium-voltage area and the influencing factor set of high loss in the low-voltage area are used as the corresponding common influencing factors of the two to form a second common influencing factor set, the same influencing factors in the influencing factor set of high loss in the medium-voltage area and the influencing factor set of high loss in the substation are used as the corresponding common influencing factors of the two to form a third common influencing factor set; the same influencing factors in the influencing factor set of high loss in the low-voltage area and the influencing factor set of high loss in the substation are used as the corresponding common influencing factors of the two to form a fourth common influencing factor set;

[0037] S43 compares the key influencing factors of the medium voltage area with the influencing factors in the above-mentioned influencing factor set respectively. If the key influencing factors are in one set or multiple sets, the basic data of the components corresponding to the current key influencing factors are recorded; the basic data of the distribution line includes: wiring code, line name, substation and voltage level; the basic data of the transformer includes: number, name, model, capacity, type and distribution line;

[0038] S44 compares the key influencing factors of the low-pressure area with the influencing factors in the above-mentioned influencing factor set respectively, and if the key influencing factors are in one set or multiple sets, records the basic data of the device corresponding to the current key influencing factors;

[0039] S45 compares the key influencing factors of the area with the influencing factors in the above influencing factor set respectively, and if the key influencing factors are in one set or multiple sets, records the basic data of the device corresponding to the current key influencing factors;

[0040] S46 repeats steps S41-S45 to process all regions under consideration.

[0041] Further, including:

[0042] In step S5, the key influencing factors and the monitored real-time high-loss line loss rate type are used to predict and determine the specific cause of high loss, including:

[0043] If a high loss value is detected for a certain line loss rate type in a certain area, the corresponding key influencing factor is obtained according to the above steps, and it is monitored whether the key influencing factor belongs to any one or more sets of common influencing factors.

[0044] If it is in it, then match the device in the corresponding areas of the other two line loss rate types according to the recorded basic data. The device is a transmission line, a transformer or an electricity user. If the corresponding basic data are the same, then match it as the same distribution line and / or transformer, and monitor the line loss rate of the corresponding area (because there is a high probability that there may be anomalies). Otherwise, if the basic data are different, it means different transmission lines and / or transformers, then continue to check the influencing factors of the area, otherwise,

[0045] First, according to the key influencing factors, the specific reasons for the high loss in the corresponding area of ​​the line loss rate type are investigated. If the high loss caused by the key influencing factors is excluded, other influencing factors will continue to be investigated.

[0046] Further, including:

[0047] The energy-saving and loss-reduction measures scheme constructed based on this includes loss-reduction measures simulation, simulated loss-reduction analysis report and simulated loss-reduction benefit analysis, wherein the loss-reduction measures simulation specifically includes, for feeders with higher line losses in different voltage levels, simulating line loss flow simulation calculation after replacement of segmented cable materials, simulating line loss flow simulation calculation after branch load cutting, simulating reactive power compensation flow simulation calculation of terminal transformer, simulating flow simulation calculation after adjustment of operation mode, comparing line losses simulated and calculated in various ways, and comparing and analyzing line loss results before and after simulation; the simulated loss-reduction analysis report specifically includes automatically generating a simulated loss-reduction analysis report based on the loss-reduction measures simulation, and outputting the results in charts; the simulated loss-reduction benefit analysis specifically includes using an indicator system to evaluate the benefits of simulated loss reduction.

[0048] Furthermore, the method further comprises:

[0049] According to the adaptability analysis results of energy-saving and loss-reduction measures, formulate targeted optimization strategies, which involve substation levels of different voltage levels, average line length, power distribution, substation density, conductor cross-sectional area, transformer equipment status, low-voltage electric energy meter ratio, reactive equipment configuration, load spatial distribution, load time distribution, grid zone operation status, grid average power factor, grid maximum natural reactive load level, power sales of each voltage level, classified power sales, and optimization strategies corresponding to natural and social development indicators;

[0050] After the optimization strategy is implemented, real-time monitoring and feedback are required. Through the monitoring equipment installed in the medium-voltage area, low-voltage area and substation area, the operation status and energy efficiency data of the line are obtained in real time. These data are compared and analyzed with the data before the optimization strategy is implemented, the implementation effect of the optimization strategy is evaluated, and the relationship between the strategies of the medium-voltage area, low-voltage area and substation area is evaluated;

[0051] If it is found that the implementation effect is not ideal or there are problems, timely feedback and adjustments are required, the adaptability of energy-saving and loss-reduction measures should be re-evaluated, the optimization strategies of each area should be adjusted, or other measures should be taken for improvement. Through continuous iteration and optimization, the relationship between the influencing factors of the medium-voltage area, low-voltage area and substation lines can be gradually obtained, and the energy efficiency level and energy-saving and loss-reduction effects of each area can be improved.

[0052] On the other hand, the present invention also provides an energy-saving and loss-reduction adaptability evaluation system based on medium and low voltage lines, the system comprising:

[0053] Data collection module, used to collect basic data and operation data of distribution lines and transformers of different distribution networks in different areas, as well as user power consumption;

[0054] A line loss calculation module is used to calculate the distribution network line loss in the medium voltage area, the distribution network line loss in the low voltage area and the line loss in the substation area according to the operation data, and preliminarily form the influencing factors of the line loss in each area;

[0055] The module includes a medium voltage area line loss calculation unit, a low voltage area line loss calculation unit and a substation area line loss calculation unit, which respectively calculate the distribution network line loss in the medium voltage area, the distribution network line loss in the low voltage area and the line loss in the substation area according to the operation data. The module also includes an influencing factor determination unit, which is used to collect various influencing factors of the line loss and form a corresponding set;

[0056] The monitoring module includes a data monitoring unit for real-time monitoring and recording of three types of line losses, namely, medium-voltage area line loss, low-voltage area line loss, and transformer area line loss.

[0057] A line loss rate calculation unit, used for calculating corresponding line loss rates according to three line loss types;

[0058] A judgment unit, used to judge whether a set threshold is exceeded, and analyze the corresponding line loss rate exceeding the set threshold to determine one or more influencing factors that lead to high losses of multiple distribution networks in different areas;

[0059] The influencing factor processing module is used to sort the influencing factors that cause high losses in different distribution networks in different regions from high to low according to the frequency, and then obtain the key influencing factors of the medium voltage area, the key influencing factors of the low voltage area and the key influencing factors of the substation area, and compare the key influencing factors of different areas in the same area with the influencing factor set corresponding to the line loss rate type that causes high losses in the target area;

[0060] The loss reduction measures construction module is used to use key influencing factors and the monitored high-loss line loss rate types to predict and determine the specific causes of high losses, and build energy-saving and loss reduction measures based on this.

[0061] Further, including:

[0062] The judgment unit of the monitoring module specifically includes:

[0063] Set the threshold corresponding to the medium-voltage line loss rate in the target area to α, the threshold corresponding to the low-voltage line loss rate to β, and the threshold corresponding to the line loss rate in the substation area to γ, and β>γ>α;

[0064] If it is detected that the medium voltage line loss rate of the current distribution network is lower than α, the low voltage line loss rate is lower than β, or / and the area line loss rate is lower than γ, they are all recorded as low losses, and monitoring continues. Otherwise,

[0065] If it is monitored that the medium voltage line loss rate in the current distribution network is greater than or equal to α, and the low voltage line loss rate is lower than β and the area line loss rate is not greater than γ, then the influencing factors of the medium voltage area itself are considered, and the influencing factors of the medium voltage area itself include the medium voltage line and the transformer on the medium voltage side; otherwise,

[0066] If the low-voltage line loss rate is greater than or equal to β, and the area line loss rate is greater than or equal to γ, and the medium-voltage line loss rate is lower than α, first check the common influencing factors of the low-voltage area and the area, and record the relevant influencing factors. Otherwise,

[0067] If the low-voltage line loss rate is greater than or equal to β, and the area line loss rate is lower than γ, the influencing factors of the low-voltage area itself are considered, and the influencing factors of the low-voltage area itself include the low-voltage line and the transformer on the low-voltage side; otherwise,

[0068] If the line loss rate of the transformer area is greater than or equal to γ, the low-voltage line loss rate is lower than β, and the medium-voltage line loss rate is not less than α, then the common influencing factors of the transformer area and the medium-voltage area are considered and recorded. Otherwise,

[0069] If the line loss rate of the substation is greater than or equal to γ, the low-voltage line loss rate is lower than β, and the medium-voltage line loss rate is lower than α, then the influencing factors of the substation itself are considered, and the influencing factors of the substation itself include the substation-related equipment; otherwise,

[0070] If the line loss rate of the substation area is greater than or equal to γ, the low-voltage line loss rate is greater than or equal to β, and the medium-voltage line loss rate is greater than or equal to α, then they are all high losses. First, check the common influencing factors in the medium-voltage area, low-voltage area, and substation area, and record the relevant influencing factors;

[0071] The different monitored data are used to cycle through the above steps to determine one or more influencing factors that lead to high losses in multiple distribution networks in different areas.

[0072] Further, including:

[0073] The influencing factor processing module includes:

[0074] The high loss factor determination unit is used to set the number of distribution networks corresponding to the target area, and to count the influencing factors of high loss in the medium voltage area, the influencing factors of high loss in the low voltage area, and the influencing factors of high loss in the transformer area corresponding to different time periods of each distribution network, so as to obtain the influencing factors of high loss in different areas of the target area;

[0075] The common influencing factor determination unit is used to sort the frequencies of influencing factors in different time periods of the target area from high to low, and then obtain the corresponding key influencing factors, and the same influencing factors in the influencing factor set of high loss in the medium-pressure area, the influencing factor set of high loss in the low-pressure area and the influencing factor set of high loss in the substation are used as the common influencing factors of the three to form a first common influencing factor set, the same influencing factors in the influencing factor set of high loss in the medium-pressure area and the influencing factor set of high loss in the low-pressure area are used as the corresponding common influencing factors of the two to form a second common influencing factor set, the same influencing factors in the influencing factor set of high loss in the medium-pressure area and the influencing factor set of high loss in the substation are used as the corresponding common influencing factors of the two to form a third common influencing factor set; the same influencing factors in the influencing factor set of high loss in the low-pressure area and the influencing factor set of high loss in the substation are used as the corresponding common influencing factors of the two to form a fourth common influencing factor set;

[0076] A comparison unit is used to compare the key influencing factors of the medium voltage area with the influencing factors in the above-mentioned influencing factor set respectively. If the key influencing factors are in one set or multiple sets, the basic data of the device corresponding to the current key influencing factors is recorded; the basic data of the distribution line includes: wiring code, line name, substation and voltage level, and the basic data of the transformer includes: number, name, model, capacity, type and distribution line;

[0077] Compare the key influencing factors of the low-pressure area with the influencing factors in the above-mentioned influencing factor set respectively, and if the key influencing factors are in one set or multiple sets, record the basic data of the device corresponding to the current key influencing factors;

[0078] Compare the key influencing factors of the area with the influencing factors in the above-mentioned influencing factor set respectively, and if the key influencing factors are in one set or multiple sets, record the basic data of the device corresponding to the current key influencing factors;

[0079] Iteration unit, used to repeat the above unit to process all the areas considered.

[0080] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0081] (1) The present invention first collects relevant basic data and historical operation data of distribution networks at different voltage levels in different regions, then considers the influencing factors of high loss of distribution networks at different voltage levels in different regions, finds key influencing factors in the influencing factor set, and matches and compares the key influencing factors with the common influencing factors to find the correlation between the influencing factors at different voltage levels, and then focuses on monitoring and processing line losses at different levels and regions. This can not only reduce the workload of basic data maintenance for distribution networks in other regions and voltage levels, but also compare the basic data recorded in a certain area with the basic data of other areas in case of high loss. It can simultaneously process distribution networks in multiple regions and multiple voltage levels. The distribution networks in different regions are at different development stages and therefore have differences. There is no need to use actual manual field information collection, analysis, comparison, evaluation and calculation, which greatly saves manpower and material resources.

[0082] (2) The present invention firstly comprehensively considers multiple factors such as line operation characteristics, equipment status, environmental factors, etc., and realizes a comprehensive evaluation of the energy efficiency status of medium and low voltage lines by constructing a multi-dimensional evaluation index system. The method of associating line loss influencing factors of different voltage levels in different regions is simple and does not require a lot of calculations and expensive hardware, which is convenient for staff to operate and saves costs.

[0083] (3) The present invention has significantly improved the energy efficiency of medium voltage lines and reduced energy consumption and losses by implementing optimization strategies such as equipment upgrades, operation mode adjustments, and load management. This not only helps reduce the operating costs of enterprises and improve economic benefits, but also has positive significance for environmental protection and sustainable development.

[0084] (4) The present invention also emphasizes the importance of real-time monitoring and feedback. By real-time monitoring of the line's operating status and energy efficiency data, problems can be discovered and adjusted in a timely manner to ensure the effective implementation of the optimization strategy. This feedback mechanism enables continuous improvement and optimization of energy saving and loss reduction work, thereby improving the efficiency and effectiveness of energy efficiency management. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] Figure 1 It is a flow chart of the energy saving and loss reduction adaptability evaluation method based on medium and low voltage lines according to an embodiment of the present invention;

[0086] Figure 2 This is a flow chart of the energy-saving and loss-reduction adaptability assessment system based on medium and low voltage lines according to an embodiment of the present invention. DETAILED DESCRIPTION

[0087] 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.

[0088] Example 1

[0089] like Figure 1 As shown, the present invention provides an energy-saving and loss-reduction adaptability evaluation method based on medium and low voltage lines, the method comprising:

[0090] S1 collects basic data and historical operation data of distribution lines and transformers in different distribution networks in different areas, as well as user electricity consumption.

[0091] Since different regions involve distribution networks of different voltage levels and may include multiple distribution network systems, in order to monitor the differences in high-loss influencing factors in different regions, the present invention needs to collect relevant data under different distribution networks in different regions to be considered, and the time span is at least two years. The relevant data mainly include:

[0092] The basic data of the distribution line include: affiliated unit, wiring code, line name, affiliated substation, voltage level and line nature; historical operation data include: forward active power supply and reverse active power supply at the head end; forward reactive power supply and reverse reactive power supply at the head end; K factor or 24-hour current value at the head end; voltage or 24-hour voltage value at the head end; 24-hour active and reactive power values ​​at the head end;

[0093] The basic data of distribution transformers include: distribution transformer number, name, model, capacity, type (public or private), and the line to which they belong; historical operation data include: whether high-voltage side metering is performed, PT, CT, active power, reactive power, 24-hour active and reactive power values, and 24-hour voltage and current values;

[0094] The electricity consumption of users in the target area for at least two years is not limited in specific form and can also be represented by an electricity consumption curve. The above data needs to be preprocessed, mainly cleaning and normalization, etc., which will not be repeated in this embodiment.

[0095] S2 calculates the distribution network line loss in the medium voltage area, the distribution network line loss in the low voltage area and the line loss in the substation area according to the operation data, and preliminarily forms the influencing factors of the line loss in each area.

[0096] Since different regions may involve medium-voltage areas, low-voltage areas and multiple substations, a distribution network system is taken as the smallest unit to calculate the distribution network line loss in the medium-voltage area, the distribution network line loss in the low-voltage area and the line loss in the substation in different time periods in a distribution network system, and form a set of influencing factors of the line loss based on experience.

[0097] S3 determines whether the corresponding line loss rate exceeds the set threshold based on the records of three types of line loss rates, namely the line loss rate in the medium voltage area, the line loss rate in the low voltage area, and the line loss rate in the substation area, and analyzes the corresponding line loss rate that exceeds the set threshold to determine one or more influencing factors that lead to high losses in multiple distribution networks in different areas.

[0098] The corresponding line loss rate is calculated according to the obtained line loss in different areas. The area of ​​the present invention refers to the medium voltage area, the low voltage area and the station area. The region refers to a specific geographical area. The method used to calculate the line loss rate can be:

[0099] The basic idea of ​​the equivalent resistance method is: at the head end of the distribution line, an equivalent line resistance R is assumed, and the loss caused by the total current (I) passing through the head end of the line is equal to the sum of the losses caused by the different segment currents I in each section of the line through the segment resistance R.

[0100] The equivalent resistance method does not require the collection of operating data. It is only related to the structural parameters of the distribution transformer rated capacity and the segmented line resistance. The power loss can be calculated by calculating the equivalent resistance data. It is suitable for theoretical line loss calculation of distribution networks of 10kV and below.

[0101] The power flow method is a calculation method with higher calculation accuracy among the theoretical line loss calculation methods of distribution networks. The power flow calculation of distribution networks takes the feeder as the basic unit. The basic task is to solve the state variables of the system, that is, the voltage or power of each bus on the feeder.

[0102] The present invention selects and establishes a corresponding theoretical line loss calculation model for power distribution according to different voltage levels. First, the distribution line and transformer loss information is obtained to perform theoretical line loss calculation: the power flow algorithm model corresponds to the forward and backward power flow calculation of the distribution network, and the equivalent resistance model corresponds to the distribution network based on the distribution transformer power and distribution transformer capacity calculation.

[0103] After obtaining the line loss rate corresponding to different areas, first determine whether it exceeds the set threshold. For example, in the embodiment of the present invention, the line loss rate threshold α of the pressure zone is set to 12%, that is, higher than 12% is considered high loss, and lower than 12% is judged as high loss. The threshold is slightly different in different areas. The low-voltage line loss rate threshold β is set to 15%. Since there may be both medium voltage and low voltage in the substation area, the threshold γ is set to 13%.

[0104] The corresponding line loss rate exceeding the set threshold is analyzed to determine one or more influencing factors that lead to high losses of multiple distribution networks in different areas, including:

[0105] S31 sets the threshold corresponding to the medium voltage line loss rate in the target area to α, the threshold corresponding to the low voltage line loss rate to β, and the threshold corresponding to the line loss rate in the substation area to γ, and β>γ>α;

[0106] If S32 detects that the medium voltage line loss rate of the current distribution network is lower than α, the low voltage line loss rate is lower than β, or / and the area line loss rate is lower than γ, it is recorded as low loss, and monitoring continues. Otherwise,

[0107] If it is monitored that the medium voltage line loss rate in the current distribution network is greater than or equal to α, and the low voltage line loss rate is lower than β and the area line loss rate is not greater than γ, then the influencing factors of the medium voltage area itself are considered, and the influencing factors of the medium voltage area itself include the medium voltage line and the transformer on the medium voltage side; otherwise,

[0108] If the low-voltage line loss rate is greater than or equal to β, and the area line loss rate is greater than or equal to γ, and the medium-voltage line loss rate is lower than α, first check the common influencing factors of the low-voltage area and the area, and record the relevant influencing factors. Otherwise,

[0109] If the low-voltage line loss rate is greater than or equal to β, and the area line loss rate is lower than γ, the influencing factors of the low-voltage area itself are considered, and the influencing factors of the low-voltage area itself include the low-voltage line and the transformer on the low-voltage side; otherwise,

[0110] If the line loss rate of the transformer area is greater than or equal to γ, the low-voltage line loss rate is lower than β, and the medium-voltage line loss rate is not less than α, then the common influencing factors of the transformer area and the medium-voltage area are considered and recorded. Otherwise,

[0111] If the line loss rate of the substation is greater than or equal to γ, the low-voltage line loss rate is lower than β, and the medium-voltage line loss rate is lower than α, then the influencing factors of the substation itself are considered. The influencing factors of the substation itself include substation-related equipment, such as switches, protection equipment, etc.; otherwise,

[0112] If the line loss rate of the substation area is greater than or equal to γ, the low-voltage line loss rate is greater than or equal to β, and the medium-voltage line loss rate is greater than or equal to α, then they are all high losses. First, check the common influencing factors in the medium-voltage area, low-voltage area, and substation area, and record the relevant influencing factors;

[0113] S33 uses the different monitored data to cycle the judgment in step S32, and then determines one or more influencing factors that cause high losses in multiple distribution networks in different areas.

[0114] The above-mentioned comparison method in the embodiment of the present invention not only integrates and analyzes the causes of high losses in the three areas, but also further screens the influencing factors of high losses in different areas, provides the staff with a focus on the factors to be checked, avoids aimless inspections and repetitive work, thereby reducing labor costs, and through the above-mentioned comparative analysis, a neural network model can also be used for iterative training to accurately obtain the influencing factors causing high losses in the three areas, thereby performing precise processing with higher accuracy.

[0115] S4 sorts the influencing factors that cause high losses in different distribution networks in different regions from high to low according to frequency, and then obtains the key influencing factors of the medium voltage area, the key influencing factors of the low voltage area and the key influencing factors of the substation area, and compares the key influencing factors of different areas in the same area with the influencing factor set corresponding to the line loss rate type that causes high losses in the target area. Specifically:

[0116] S41 sets the number of distribution networks corresponding to the target area, and counts the influencing factors set of high loss in the medium voltage area, the influencing factors set of high loss in the low voltage area, and the influencing factors set of high loss in the transformer area corresponding to different time periods of each distribution network, thereby obtaining the influencing factors of high loss in different areas of the target area;

[0117] S42 sorts the frequencies of occurrence of the influencing factors of the target area in different time periods from high to low, and then obtains the corresponding key influencing factors. The key influencing factors in the present invention select the influencing factors with the highest ranking.

[0118] And according to the influencing factors set of high loss in the medium voltage area, the influencing factors set of high loss in the low voltage area and the influencing factors set of high loss in the substation area as the common influencing factors of the three, a first common influencing factors set is formed, the influencing factors set of high loss in the medium voltage area and the influencing factors set of high loss in the low voltage area are the common influencing factors corresponding to the two, forming a second common influencing factors set, the influencing factors set of high loss in the medium voltage area and the influencing factors set of high loss in the substation area are the common influencing factors corresponding to the two, forming a third common influencing factors set; the influencing factors set of high loss in the low voltage area and the influencing factors set of high loss in the substation area are the common influencing factors corresponding to the two, forming a fourth common influencing factors set;

[0119] S43 compares the key influencing factors of the medium voltage zone with the influencing factors in the above-mentioned influencing factor set respectively. If the key influencing factors are in one set or multiple sets, the basic data of the device corresponding to the current key influencing factors is recorded. Otherwise, it is processed separately. In the embodiment of the present invention, the basic data of the distribution line includes: wiring code, line name, substation and voltage level. The basic data of the transformer includes: number, name, model, capacity, type and distribution line.

[0120] The present invention gives an example as follows: For example, the set of influencing factors of high loss in the medium-pressure area is expressed as:

[0121] f1={f11,f12,f13,f14,f15},

[0122] The set of factors affecting high loss in low-pressure area is expressed as:

[0123] f2 = {f21, f12, f23, f24, f15};

[0124] The influencing factor set of high loss in the substation is the total set of all substations in the current distribution network system, which can be expressed as:

[0125] f3={f21,f32,f33,f24,f15}

[0126] Therefore, the first common influencing factor set is expressed as: {f15}, the second common influencing factor set is expressed as: {f12, f15}, the third common influencing factor set is expressed as: {f15}, and the fourth common influencing factor set is expressed as: {f21, f24, f15}; at this time, the key influencing factor f11 in the medium pressure area is not in any common influencing factor set.

[0127] S44 compares the key influencing factors of the low-pressure area with the influencing factors in the above-mentioned influencing factor set respectively. If the key influencing factors are in one set or multiple sets, the basic data of the device corresponding to the current key influencing factors are recorded.

[0128] According to the above example, the key influencing factor f21 of the low-voltage area is in the fourth common influencing factor set. Therefore, the basic data of the device corresponding to the key influencing factor is recorded. If the key influencing factor is the average length of the corresponding line segment, the basic data of the corresponding distribution line segment is recorded.

[0129] S45 compares the key influencing factors of the area with the influencing factors in the above-mentioned influencing factor set respectively. If the key influencing factors are in one set or multiple sets, the basic data of the device corresponding to the current key influencing factors is recorded.

[0130] Similarly, according to the above example, the key influencing factor f21 of the substation is in the fourth common influencing factor set. Therefore, the basic data of the device corresponding to the key influencing factor is recorded. If the key influencing factor is the average length of the corresponding line segment, the basic data of the corresponding distribution line segment is recorded.

[0131] S46 repeats steps S41-S45 to process all regions under consideration.

[0132] In the embodiment of the present invention, the above steps are a training process. For greater accuracy, a suitable neural network model may be used for training so that the model can automatically adapt to different line operating environments and conditions, thereby improving the accuracy of the evaluation.

[0133] S5 uses key influencing factors and real-time monitored high-loss line loss rate types to predict and determine the specific causes of high losses, and builds energy-saving and loss reduction measures based on this.

[0134] In step S5, the real-time monitoring results are predicted mainly based on the results of the above steps, which specifically includes:

[0135] If a high loss value is detected for a certain line loss rate type in a certain area, the corresponding key influencing factor is obtained according to the above steps, and it is monitored whether the key influencing factor belongs to any one or more sets of common influencing factors.

[0136] If it is in it, then the device is matched in the corresponding areas of the other two line loss rate types according to the recorded basic data. The device is a transmission line, a transformer or an electricity user. If the corresponding basic data are the same, it is matched as the same distribution line and / or transformer, and the line loss rate of the corresponding area is monitored. Since the substation may include medium-voltage and low-voltage areas, and contain devices with the same basic data, it is highly likely that the line loss in the corresponding area will also be abnormal, thereby achieving a high-efficiency monitoring effect. For example, in the above example, the key influencing factor f21 of the low-voltage area is in the fourth common influencing factor set, and the fourth common influencing factor set is a set of low-voltage areas and substations. Therefore, first traverse the substation to see if there are devices with corresponding basic data, such as transformers. If so, monitor and troubleshoot the line loss in the substation together.

[0137] Otherwise, if the basic data are different, it indicates different transmission lines and / or transformers, and the influencing factors of the area will continue to be investigated. That is, if there is no transformer with the same basic data, the key influencing factors and other influencing factors that cause high losses in the low-voltage area will continue to be investigated.

[0138] If the key influencing factor is not in any set, first investigate the specific reasons for the high loss in the area corresponding to the line loss rate type based on the key influencing factor. If the high loss caused by the key influencing factor is excluded, continue to investigate other influencing factors.

[0139] If the key influencing factors of the medium voltage area mentioned above are not in any set, the specific reasons for the high loss in the corresponding area of ​​the line loss rate type should be investigated first according to the key influencing factors. The possible reasons may be the conductor cross-sectional area of ​​the corresponding distribution line segment, etc.

[0140] After many monitoring and tests, an energy-saving and loss-reduction measures program is constructed, including loss-reduction measures simulation, simulated loss-reduction analysis report and simulated loss-reduction benefit analysis. The loss-reduction measures simulation specifically includes, for feeders with higher line losses at different voltage levels, line loss flow simulation calculation after simulating the replacement of segmented cable materials, line loss flow simulation calculation after branch load cutting, line loss flow simulation calculation after reactive power compensation of the terminal transformer, and line flow simulation calculation after adjustment of the operation mode. The line losses simulated and calculated in various ways are compared, and the line loss results before and after the simulation are compared and analyzed. The simulated loss-reduction analysis report specifically generates a simulated loss-reduction analysis report automatically based on the loss-reduction measures simulation, and the results are output in the form of charts. The simulated loss-reduction benefit analysis specifically uses an indicator system to evaluate the benefits of simulated loss reduction.

[0141] Example 2

[0142] Based on Example 1, the method further comprises:

[0143] Conduct adaptability analysis on the constructed energy-saving and loss-reduction measures, input the energy-saving and loss-reduction measures to be evaluated into the analysis model, and obtain the adaptability score of the measures through calculation and analysis of the analysis model. The higher the score, the greater the improvement of the measures on energy-saving and loss-reduction of medium-voltage lines, and the better the adaptability;

[0144] According to the adaptability scoring results, different energy-saving and loss-reduction measures are compared and ranked to provide a basis for formulating optimization strategies.

[0145] Example 3

[0146] Based on Example 2, the method further includes:

[0147] According to the adaptability analysis results of energy-saving and loss-reduction measures, formulate targeted optimization strategies, which involve optimization strategies corresponding to influencing factors such as substation levels of different voltage levels, average line length, power distribution, substation density, conductor cross-sectional area, transformer equipment status, low-voltage electric energy meter ratio, reactive equipment configuration, load spatial distribution, load time distribution, grid zone operation status, grid average power factor, grid maximum natural reactive load level, power sales of each voltage level, classified power sales, natural and social development conditions, etc.;

[0148] After the optimization strategy is implemented, real-time monitoring and feedback are required. Through the monitoring equipment installed in the medium-voltage area, low-voltage area and substation area, the operation status and energy efficiency data of the line are obtained in real time. These data are compared and analyzed with the data before the optimization strategy is implemented, the implementation effect of the optimization strategy is evaluated, and the relationship between the strategies of the medium-voltage area, low-voltage area and substation area is evaluated;

[0149] If it is found that the implementation effect is not ideal or there are problems, timely feedback and adjustments are required, the adaptability of energy-saving and loss-reduction measures should be re-evaluated, the optimization strategies of each area should be adjusted, or other measures should be taken for improvement. Through continuous iteration and optimization, the relationship between the influencing factors of the medium-voltage area, low-voltage area and substation lines can be gradually obtained, and the energy efficiency level and energy-saving and loss-reduction effects of each area can be improved.

[0150] Based on the above content, a specific case is provided in this embodiment. For example, in a core area of ​​a city, due to concentrated power load and complex lines, the energy efficiency problem of medium-voltage lines is particularly prominent. For this area, the method of the present invention is used to perform energy-saving and loss-reduction adaptability assessment.

[0151] Based on the above content, an adaptability evaluation model was first constructed.

[0152] like

[0153] Among them, X g is the adaptability coefficient of the target to be selected, d g is the ambient temperature of the selected target, d pre is the standard ambient temperature, kd is the temperature weight value, m pre is the humidity of the environment where the target is located, k m is the humidity weight value, and the subsequent influencing factors are similar.

[0154] Taking into account the special environment of the urban core area, environmental factors such as temperature and humidity were added to the model, and the model was trained with a large amount of historical data, so that it can more accurately evaluate the adaptability of energy-saving and loss-reduction measures.

[0155] Based on the constructed model, the adaptability analysis of various energy-saving and loss-reduction measures was carried out. For example, the effect of replacing high-efficiency transformers was evaluated, and the model showed that it could significantly reduce line losses and improve energy efficiency.

[0156] Based on the evaluation results, a detailed optimization strategy was formulated, including gradually replacing inefficient transformers and optimizing the load distribution of the line. After the optimization plan was implemented, through real-time monitoring data, it was found that the line energy efficiency had been significantly improved.

[0157] There are usually a large number of industrial electrical equipment in industrial parks, and energy efficiency management of medium-voltage lines is crucial to reducing enterprise operating costs.

[0158] First, we collected comprehensive data on the medium-voltage lines in the industrial park, including line load conditions, equipment operating status, etc. Through data analysis, we found that some lines were overloaded, and some equipment had low energy efficiency.

[0159] Based on these data, a targeted adaptability assessment model was constructed. Considering the diversity and operating characteristics of equipment in the industrial park, features such as equipment type and operating time were added to the model to improve the accuracy of the assessment.

[0160] After evaluating various energy-saving and loss-reduction measures, optimization strategies such as adjusting line layout, upgrading some key equipment, and implementing intelligent dispatching were proposed. After implementing these strategies, the energy efficiency of the medium-voltage lines in the industrial park has been significantly improved, and the operating costs of enterprises have been reduced accordingly.

[0161] Medium-voltage lines in rural areas usually have a wide coverage area and outdated equipment, and energy conservation and loss reduction work faces many challenges.

[0162] In a rural area, a detailed survey and data collection of existing lines and equipment was first conducted. By analyzing the data, it was found that line aging and low energy efficiency of equipment were the main reasons for high energy consumption.

[0163] Based on these data, an adaptability assessment model suitable for rural areas was constructed. Taking into account the characteristics of power demand and line operation conditions in rural areas, factors such as line length and equipment age were added to the model.

[0164] After evaluating various energy-saving and loss-reduction measures, optimization strategies such as gradually replacing old equipment, strengthening line maintenance, and promoting energy-saving technologies were proposed. Through the implementation of these strategies, the energy efficiency of medium-voltage lines in rural areas has been significantly improved, while also providing strong power guarantee for local economic development.

[0165] These cases demonstrate the practical application effect of the present invention in the adaptability assessment of energy saving and loss reduction of medium-voltage lines. By adopting different data collection and assessment methods according to different regional and environmental characteristics, it is possible to accurately assess and optimize energy saving and loss reduction measures for medium-voltage lines, providing strong support for the economic operation and sustainable development of the power system.

[0166] Example 4

[0167] The present invention also provides an energy-saving and loss-reducing adaptability evaluation system based on medium and low voltage lines, such as Figure 2 As shown, the system includes:

[0168] Data collection module, used to collect basic data and operation data of distribution lines and transformers in different distribution networks and different areas, as well as user power consumption in real time;

[0169] A line loss calculation module is used to calculate the real-time distribution network line loss in the medium voltage area, the real-time distribution network line loss in the low voltage area and the real-time line loss in the substation area according to the operation data, and preliminarily form the influencing factors of the line loss in each area;

[0170] The module includes a medium voltage area line loss calculation unit, a low voltage area line loss calculation unit and a substation area line loss calculation unit, which respectively calculate the real-time distribution network line loss in the medium voltage area, the real-time distribution network line loss in the low voltage area and the real-time line loss in the substation area according to the operation data. The module also includes an influencing factor determination unit, which is used to collect various influencing factors of the line loss and form a corresponding set;

[0171] The monitoring module includes a data monitoring unit for real-time monitoring and recording of three types of line losses, namely, medium-voltage area line loss, low-voltage area line loss, and transformer area line loss.

[0172] A line loss rate calculation unit, used for calculating corresponding line loss rates according to three line loss types;

[0173] A judgment unit, used to judge whether a set threshold is exceeded, and analyze the corresponding line loss rate exceeding the set threshold to determine one or more influencing factors that lead to high losses of multiple distribution networks in different areas;

[0174] The influencing factor processing module is used to sort the influencing factors that cause high losses in different distribution networks in different regions from high to low according to the frequency, and then obtain the key influencing factors of the medium voltage area, the key influencing factors of the low voltage area and the key influencing factors of the substation area, and compare the key influencing factors of different areas in the same area with the influencing factor set corresponding to the line loss rate type that causes high losses in the target area;

[0175] The loss reduction measures construction module is used to use key influencing factors and the monitored high-loss line loss rate types to predict and determine the specific causes of high losses, and build energy-saving and loss reduction measures based on this.

[0176] Further, including:

[0177] The judgment unit of the monitoring module specifically includes:

[0178] Set the threshold corresponding to the medium-voltage line loss rate in the target area to α, the threshold corresponding to the low-voltage line loss rate to β, and the threshold corresponding to the line loss rate in the substation area to γ, and β>γ>α;

[0179] If it is detected that the medium voltage line loss rate of the current distribution network is lower than α, the low voltage line loss rate is lower than β, or / and the area line loss rate is lower than γ, they are all recorded as low losses, and monitoring continues. Otherwise,

[0180] If it is monitored that the medium voltage line loss rate in the current distribution network is greater than or equal to α, and the low voltage line loss rate is lower than β and the area line loss rate is not greater than γ, then the influencing factors of the medium voltage area itself are considered, and the influencing factors of the medium voltage area itself include the medium voltage line and the transformer on the medium voltage side; otherwise,

[0181] If the low-voltage line loss rate is greater than or equal to β, and the area line loss rate is greater than or equal to γ, and the medium-voltage line loss rate is lower than α, first check the common influencing factors of the low-voltage area and the area, and record the relevant influencing factors. Otherwise,

[0182] If the low-voltage line loss rate is greater than or equal to β, and the area line loss rate is lower than γ, the influencing factors of the low-voltage area itself are considered, and the influencing factors of the low-voltage area itself include the low-voltage line and the transformer on the low-voltage side; otherwise,

[0183] If the line loss rate of the transformer area is greater than or equal to γ, the low-voltage line loss rate is lower than β, and the medium-voltage line loss rate is not less than α, then the common influencing factors of the transformer area and the medium-voltage area are considered and recorded. Otherwise,

[0184] If the line loss rate of the substation is greater than or equal to γ, the low-voltage line loss rate is lower than β, and the medium-voltage line loss rate is lower than α, then the influencing factors of the substation itself are considered, and the influencing factors of the substation itself include the substation-related equipment; otherwise,

[0185] If the line loss rate of the substation area is greater than or equal to γ, the low-voltage line loss rate is greater than or equal to β, and the medium-voltage line loss rate is greater than or equal to α, then they are all high losses. First, check the common influencing factors in the medium-voltage area, low-voltage area, and substation area, and record the relevant influencing factors;

[0186] The different monitored data are used to cycle through the above steps to determine one or more influencing factors that lead to high losses in multiple distribution networks in different areas.

[0187] Further, including:

[0188] The influencing factor processing module includes:

[0189] The high loss factor determination unit is used to set the number of distribution networks corresponding to the target area, and to count the influencing factors of high loss in the medium voltage area, the influencing factors of high loss in the low voltage area, and the influencing factors of high loss in the transformer area corresponding to different time periods of each distribution network, so as to obtain the influencing factors of high loss in different areas of the target area;

[0190] The common influencing factor determination unit is used to sort the frequencies of influencing factors in different time periods of the target area from high to low, and then obtain the corresponding key influencing factors, and the same influencing factors in the influencing factor set of high loss in the medium-pressure area, the influencing factor set of high loss in the low-pressure area and the influencing factor set of high loss in the substation are used as the common influencing factors of the three to form a first common influencing factor set, the same influencing factors in the influencing factor set of high loss in the medium-pressure area and the influencing factor set of high loss in the low-pressure area are used as the corresponding common influencing factors of the two to form a second common influencing factor set, the same influencing factors in the influencing factor set of high loss in the medium-pressure area and the influencing factor set of high loss in the substation are used as the corresponding common influencing factors of the two to form a third common influencing factor set; the same influencing factors in the influencing factor set of high loss in the low-pressure area and the influencing factor set of high loss in the substation are used as the corresponding common influencing factors of the two to form a fourth common influencing factor set;

[0191] A comparison unit is used to compare the key influencing factors of the medium voltage area with the influencing factors in the above-mentioned influencing factor set respectively. If the key influencing factors are in one set or multiple sets, the basic data of the device corresponding to the current key influencing factors is recorded; the basic data of the distribution line includes: wiring code, line name, substation and voltage level, and the basic data of the transformer includes: number, name, model, capacity, type and distribution line;

[0192] Compare the key influencing factors of the low-pressure area with the influencing factors in the above-mentioned influencing factor set respectively, and if the key influencing factors are in one set or multiple sets, record the basic data of the device corresponding to the current key influencing factors;

[0193] Compare the key influencing factors of the area with the influencing factors in the above-mentioned influencing factor set respectively, and if the key influencing factors are in one set or multiple sets, record the basic data of the device corresponding to the current key influencing factors;

[0194] Iteration unit, used to repeat the above unit to process all the areas considered.

[0195] Other technical features of the energy-saving and loss-reduction adaptability assessment system based on medium and low voltage lines in the present invention are the same as the corresponding energy-saving and loss-reduction adaptability assessment method based on medium and low voltage lines, and will not be repeated in this embodiment.

[0196] Finally, the present invention also provides a computer-readable storage medium, on which is stored an early warning program for an energy-saving and loss-reduction adaptability assessment algorithm based on medium and low voltage lines. When the energy-saving and loss-reduction adaptability assessment program based on medium and low voltage lines is executed by a processor, the steps of the energy-saving and loss-reduction adaptability assessment algorithm based on medium and low voltage lines as described above are implemented.

[0197] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0198] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0199] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for evaluating the energy saving and loss reduction adaptability of medium and low voltage lines, characterized in that: The method includes: S1 collects basic data and operation data of distribution lines and transformers of different distribution networks in different areas, as well as the power consumption of users; S2 calculates the distribution network line loss in the medium voltage area, the distribution network line loss in the low voltage area and the line loss in the substation area according to the operation data, and preliminarily forms the influencing factors of the line loss in each area; S3 monitors and records three types of line loss rates, namely, the line loss rate in the medium voltage area, the line loss rate in the low voltage area, and the line loss rate in the substation area, and determines whether it exceeds the set threshold, analyzes the corresponding line loss rate that exceeds the set threshold, and determines one or more influencing factors that cause high losses in multiple distribution networks in different areas; S4 sorts the influencing factors that cause high losses in different distribution networks in different regions from high to low according to the frequency, and then obtains the key influencing factors of the medium voltage area, the key influencing factors of the low voltage area and the key influencing factors of the substation area, and compares the key influencing factors of different areas in the same area with the influencing factor set corresponding to the line loss rate type that causes high losses in the target area; S5 will monitor the real-time high-loss line loss rate type to predict and determine the specific cause of the high loss, and build energy-saving and loss-reduction measures based on this; The step S4 comprises: S41 sets the number of distribution networks corresponding to the target area, and counts the influencing factors set of high loss in the medium voltage area, the influencing factors set of high loss in the low voltage area, and the influencing factors set of high loss in the transformer area corresponding to different time periods of each distribution network, thereby obtaining the influencing factors of high loss in different areas of the target area; S42 sorts the frequencies of the influencing factors of the target area in different time periods from high to low, and then obtains the corresponding key influencing factors, and the same influencing factors in the influencing factor set of high loss in the medium-voltage area, the influencing factor set of high loss in the low-voltage area and the influencing factor set of high loss in the substation are used as the common influencing factors of the three to form a first common influencing factor set, the same influencing factors in the influencing factor set of high loss in the medium-voltage area and the influencing factor set of high loss in the low-voltage area are used as the corresponding common influencing factors of the two to form a second common influencing factor set, the same influencing factors in the influencing factor set of high loss in the medium-voltage area and the influencing factor set of high loss in the substation are used as the corresponding common influencing factors of the two to form a third common influencing factor set; the same influencing factors in the influencing factor set of high loss in the low-voltage area and the influencing factor set of high loss in the substation are used as the corresponding common influencing factors of the two to form a fourth common influencing factor set; S43 compares the key influencing factors of the medium voltage area with the influencing factors in the above-mentioned influencing factor set respectively. If the key influencing factors are in one set or multiple sets, the basic data of the components corresponding to the current key influencing factors are recorded; the basic data of the distribution line includes: wiring code, line name, substation and voltage level; the basic data of the transformer includes: number, name, model, capacity, type and distribution line; S44 compares the key influencing factors of the low-pressure area with the influencing factors in the above-mentioned influencing factor set respectively, and if the key influencing factors are in one set or multiple sets, records the basic data of the device corresponding to the current key influencing factors; S45 compares the key influencing factors of the area with the influencing factors in the above influencing factor set respectively, and if the key influencing factors are in one set or multiple sets, records the basic data of the device corresponding to the current key influencing factors; S46 repeats steps S41-S45 to process all the areas under consideration; In step S5, the monitored real-time high-loss line loss rate type is used to predict and determine the specific cause of the high loss, including: If a high loss value is detected for a certain line loss rate type in a certain area, the corresponding key influencing factor is obtained according to the above steps, and it is monitored whether the key influencing factor belongs to any one or more sets of common influencing factors. If it is in it, then match the device in the corresponding areas of the other two line loss rate types according to the recorded basic data. The device is a transmission line, a transformer or an electricity user. If the corresponding basic data are the same, then match it as the same distribution line and / or transformer, and monitor the line loss rate of the corresponding area. Otherwise, if the basic data are different, it means different transmission lines and / or transformers, then continue to check the influencing factors of the area, otherwise, First, according to the key influencing factors, the specific reasons for the high loss in the corresponding area of ​​the line loss rate type are investigated. If the high loss caused by the key influencing factors is excluded, other influencing factors will continue to be investigated.

2. The energy saving and loss reduction adaptability evaluation method based on medium and low voltage lines according to claim 1 is characterized in that: The method further includes: Conduct adaptability analysis on the constructed energy-saving and loss-reduction measures, input the energy-saving and loss-reduction measures to be evaluated into the analysis model, and obtain the adaptability score of the measures through calculation and analysis of the analysis model. The higher the score, the greater the improvement of the measures on energy-saving and loss-reduction of medium-voltage lines, and the better the adaptability; According to the adaptability scoring results, different energy-saving and loss-reduction measures are compared and ranked to provide a basis for formulating optimization strategies.

3. The energy saving and loss reduction adaptability evaluation method based on medium and low voltage lines according to claim 1 or 2 is characterized in that: The step S3 specifically includes: S31 sets the threshold corresponding to the line loss rate in each area to , the threshold corresponding to the low voltage line loss rate is set to , the corresponding threshold of the line loss rate in the substation area is set to ,and ; S32 If it is detected that the medium voltage line loss rate of the current distribution network in the area is lower than , the low voltage line loss rate is lower than Or / and the line loss rate of the substation area is lower than , it is recorded as low loss, then continue monitoring, otherwise, If the medium voltage line loss rate in the current distribution network is monitored to be greater than or equal to , and the low voltage line loss rate is lower than And the line loss rate in the station area is not greater than , then the influencing factors of the medium voltage area itself are considered, and the influencing factors of the medium voltage area itself include the medium voltage line and the transformer on the medium voltage side; otherwise, If the low voltage line loss rate is greater than or equal to , and the line loss rate of the substation area is greater than or equal to , the medium voltage line loss rate is lower than , first check the common influencing factors of the low-pressure area and the substation area, and record the relevant influencing factors. Otherwise, If the low voltage line loss rate is greater than or equal to , and the line loss rate in the station area is lower than , then the influencing factors of the low-voltage area itself are considered, and the influencing factors of the low-voltage area itself include the low-voltage line and the transformer on the low-voltage side; otherwise, If the line loss rate in the substation area is greater than or equal to , the low voltage line loss rate is lower than , the medium voltage line loss rate is not less than , then the common influencing factors of the substation and medium voltage area are considered and recorded. Otherwise, If the line loss rate in the substation area is greater than or equal to , the low voltage line loss rate is lower than , the medium voltage line loss rate is less than , then the influencing factors of the substation itself are considered, and the influencing factors of the substation itself include the substation-related equipment; otherwise, If the line loss rate in the substation area is greater than or equal to , low voltage line loss rate is greater than or equal to , medium voltage line loss rate is greater than or equal to , all of them are high losses. First, check the common influencing factors in the medium-voltage area, low-voltage area and substation area, and record the relevant influencing factors; S33 uses the different monitored data to cycle the judgment in step S32, and then determines one or more influencing factors that cause high losses in multiple distribution networks in different areas.

4. The energy saving and loss reduction adaptability evaluation method based on medium and low voltage lines according to claim 1 is characterized in that: The energy-saving and loss-reduction measures scheme constructed based on this includes loss-reduction measures simulation, simulated loss-reduction analysis report and simulated loss-reduction benefit analysis, wherein the loss-reduction measures simulation specifically includes, for feeders with higher line losses in different voltage levels, simulating line loss flow simulation calculation after replacement of segmented cable materials, simulating line loss flow simulation calculation after branch load cutting, simulating reactive power compensation flow simulation calculation of terminal transformer, simulating flow simulation calculation after adjustment of operation mode, comparing line losses simulated and calculated in various ways, and comparing and analyzing line loss results before and after simulation; the simulated loss-reduction analysis report specifically includes automatically generating a simulated loss-reduction analysis report based on the loss-reduction measures simulation, and outputting the results in charts; the simulated loss-reduction benefit analysis specifically includes using an indicator system to evaluate the benefits of simulated loss reduction.

5. The energy saving and loss reduction adaptability evaluation method based on medium and low voltage lines according to claim 1 or 2 is characterized in that: The method further includes: According to the adaptability analysis results of energy-saving and loss-reduction measures, formulate targeted optimization strategies, which involve substation levels of different voltage levels, average line length, power distribution, substation density, conductor cross-sectional area, transformer equipment status, low-voltage electric energy meter ratio, reactive equipment configuration, load spatial distribution, load time distribution, grid zone operation status, grid average power factor, grid maximum natural reactive load level, power sales of each voltage level, classified power sales, and optimization strategies corresponding to natural and social development indicators; After the optimization strategy is implemented, real-time monitoring and feedback are required. Through the monitoring equipment installed in the medium-voltage area, low-voltage area and substation area, the operation status and energy efficiency data of the line are obtained in real time. These data are compared and analyzed with the data before the optimization strategy is implemented, the implementation effect of the optimization strategy is evaluated, and the relationship between the strategies of the medium-voltage area, low-voltage area and substation area is evaluated; If it is found that the implementation effect is not ideal or there are problems, timely feedback and adjustments are required, the adaptability of energy-saving and loss-reduction measures should be re-evaluated, the optimization strategies of each area should be adjusted, or other measures should be taken for improvement. Through continuous iteration and optimization, the relationship between the influencing factors of the medium-voltage area, low-voltage area and substation lines can be gradually obtained, and the energy efficiency level and energy-saving and loss-reduction effects of each area can be improved.

6. An energy-saving and loss-reduction adaptability evaluation system based on medium and low voltage lines, characterized in that: The system includes: Data collection module, used to collect basic data and operation data of distribution lines and transformers of different distribution networks in different areas, as well as user power consumption; A line loss calculation module is used to calculate the distribution network line loss in the medium voltage area, the distribution network line loss in the low voltage area and the line loss in the substation area according to the operation data, and preliminarily form the influencing factors of the line loss in each area; The module includes a medium voltage area line loss calculation unit, a low voltage area line loss calculation unit and a substation area line loss calculation unit, which respectively calculate the distribution network line loss in the medium voltage area, the distribution network line loss in the low voltage area and the line loss in the substation area according to the operation data. The module also includes an influencing factor determination unit, which is used to collect various influencing factors of the line loss and form a corresponding set; The monitoring module includes a data monitoring unit for monitoring and recording three types of line losses, namely, line losses in the medium voltage area, line losses in the low voltage area, and line losses in the transformer area. A line loss rate calculation unit, used for calculating corresponding line loss rates according to three line loss types; A judgment unit, used to judge whether the line loss rate exceeds a set threshold, and analyze the corresponding line loss rate exceeding the set threshold to determine one or more influencing factors that lead to high losses of multiple distribution networks in different areas; The influencing factor processing module is used to sort the influencing factors that cause high losses in different distribution networks in different regions from high to low according to the frequency, and then obtain the key influencing factors of the medium voltage area, the key influencing factors of the low voltage area and the key influencing factors of the substation area, and compare the key influencing factors of different areas in the same area with the influencing factor set corresponding to the line loss rate type that causes high losses in the target area; The loss reduction measures construction module is used to predict and determine the specific causes of the high-loss line loss rate type monitored in real time, and to build energy-saving and loss reduction measures based on this; The influencing factor processing module includes: The high loss factor determination unit is used to set the number of distribution networks corresponding to the target area, and to count the influencing factors of high loss in the medium voltage area, the influencing factors of high loss in the low voltage area, and the influencing factors of high loss in the transformer area corresponding to different time periods of each distribution network, so as to obtain the influencing factors of high loss in different areas of the target area; The common influencing factor determination unit is used to sort the frequencies of influencing factors in different time periods of the target area from high to low, and then obtain the corresponding key influencing factors, and the same influencing factors in the influencing factor set of high loss in the medium-pressure area, the influencing factor set of high loss in the low-pressure area and the influencing factor set of high loss in the substation are used as the common influencing factors of the three to form a first common influencing factor set, the same influencing factors in the influencing factor set of high loss in the medium-pressure area and the influencing factor set of high loss in the low-pressure area are used as the corresponding common influencing factors of the two to form a second common influencing factor set, the same influencing factors in the influencing factor set of high loss in the medium-pressure area and the influencing factor set of high loss in the substation are used as the corresponding common influencing factors of the two to form a third common influencing factor set; the same influencing factors in the influencing factor set of high loss in the low-pressure area and the influencing factor set of high loss in the substation are used as the corresponding common influencing factors of the two to form a fourth common influencing factor set; A comparison unit is used to compare the key influencing factors of the medium voltage area with the influencing factors in the above-mentioned influencing factor set respectively. If the key influencing factors are in one set or multiple sets, the basic data of the device corresponding to the current key influencing factors is recorded; the basic data of the distribution line includes: wiring code, line name, substation and voltage level, and the basic data of the transformer includes: number, name, model, capacity, type and distribution line; Compare the key influencing factors of the low-pressure area with the influencing factors in the above-mentioned influencing factor set respectively, and if the key influencing factors are in one set or multiple sets, record the basic data of the device corresponding to the current key influencing factors; Compare the key influencing factors of the area with the influencing factors in the above-mentioned influencing factor set respectively, and if the key influencing factors are in one set or multiple sets, record the basic data of the device corresponding to the current key influencing factors; An iteration unit for repeating the above units to process all the regions under consideration; In the loss reduction measures building module, the real-time high-loss line loss rate type monitored is used to predict and determine the specific cause of the high loss, including: If a high loss value is detected for a certain line loss rate type in a certain area, the corresponding key influencing factor is obtained according to the above steps, and it is monitored whether the key influencing factor belongs to any one or more sets of common influencing factors. If it is in it, then match the device in the corresponding areas of the other two line loss rate types according to the recorded basic data. The device is a transmission line, a transformer or an electricity user. If the corresponding basic data are the same, then match it as the same distribution line and / or transformer, and monitor the line loss rate of the corresponding area. Otherwise, if the basic data are different, it means different transmission lines and / or transformers, then continue to check the influencing factors of the area, otherwise, First, according to the key influencing factors, the specific reasons for the high loss in the corresponding area of ​​the line loss rate type are investigated. If the high loss caused by the key influencing factors is excluded, other influencing factors will continue to be investigated.

7. The energy saving and loss reduction adaptability evaluation system based on medium and low voltage lines according to claim 6 is characterized in that: The judgment unit of the monitoring module specifically includes: Set the threshold corresponding to the wire loss rate in the target area to , the threshold corresponding to the low voltage line loss rate is set to , the corresponding threshold of the line loss rate in the substation area is set to ,and ; If the medium voltage line loss rate of the current distribution network in the target area is detected to be lower than , the low voltage line loss rate is lower than Or / and the line loss rate of the substation area is lower than , it is recorded as low loss, then continue monitoring, otherwise, If the medium voltage line loss rate in the current distribution network is monitored to be greater than or equal to , and the low voltage line loss rate is lower than And the line loss rate in the station area is not greater than , then the influencing factors of the medium voltage area itself are considered, and the influencing factors of the medium voltage area itself include the medium voltage line and the transformer on the medium voltage side; otherwise, If the low voltage line loss rate is greater than or equal to , and the line loss rate of the substation area is greater than or equal to , the medium voltage line loss rate is lower than , first check the common influencing factors of the low-pressure area and the substation area, and record the relevant influencing factors. Otherwise, If the low voltage line loss rate is greater than or equal to , and the line loss rate in the station area is lower than , then the influencing factors of the low-voltage area itself are considered, and the influencing factors of the low-voltage area itself include the low-voltage line and the transformer on the low-voltage side; otherwise, If the line loss rate in the substation area is greater than or equal to , the low voltage line loss rate is lower than , the medium voltage line loss rate is not less than , then the common influencing factors of the substation and medium voltage area are considered and recorded. Otherwise, If the line loss rate in the substation area is greater than or equal to , the low voltage line loss rate is lower than , the medium voltage line loss rate is less than , then the influencing factors of the substation itself are considered, and the influencing factors of the substation itself include the substation-related equipment; otherwise, If the line loss rate in the substation area is greater than or equal to , low voltage line loss rate is greater than or equal to , medium voltage line loss rate is greater than or equal to , all of them are high losses. First, check the common influencing factors in the medium-voltage area, low-voltage area and substation area, and record the relevant influencing factors; The different monitored data are used to cycle through the above steps to determine one or more influencing factors that lead to high losses in multiple distribution networks in different areas.

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