Flexible interconnected virtual dynamic capacity expansion method, system and device based on analysis of complementary load of transformer area and medium

Abstract

The present application relates to the technical field of power distribution network flexible interconnection virtual capacity expansion, in particular to a flexible interconnection virtual dynamic capacity expansion method, system, equipment and medium based on analysis of transformer area load complementarity. The historical load operation characteristics of adjacent transformer areas are obtained to determine the load matching degree between each pair of transformer areas. The position pair of the installed flexible interconnection device and the transmission capacity configuration are determined according to the load matching degree, and the real-time load bearing state of each transformer area pair is continuously obtained. When the load bearing state of the target transformer area meets the preset trigger condition, the power transfer constraint range is determined in combination with the complementary transformer area state and the transmission capacity configuration, and the power transfer is performed. Whether the balance target is reached is judged according to the load bearing state after the execution, and if not, feedback adjustment is performed. In the multi-transformer area scene, the system load balance degree is evaluated, and the transformer area combination deviating from the preset range is adjusted coordinately. The present application can realize dynamic improvement of the power supply capacity of transformer areas without adding new transformers.

Description

Technical Field

[0001] This invention relates to the field of flexible interconnection virtual capacity expansion technology for distribution networks, and in particular to a flexible interconnection virtual dynamic capacity expansion method, system, equipment, and medium based on distribution area load complementarity analysis. Background Technology

[0002] As the pressure on urban power distribution networks continues to increase, some areas are constrained by terrain, roads, and other conditions, resulting in transformers in distribution substations operating under heavy loads for extended periods, leading to insufficient power supply capacity. To alleviate this problem, existing technologies mainly employ physical capacity expansion methods such as replacing or adding distribution transformers, or use power limiters, load transfer switches, and other means to regulate the load in substations. In addition, power electronic flexible interconnection devices, represented by soft-open-point (SOP), have begun to be demonstrated and applied in distribution networks to optimize power flow between adjacent substations.

[0003] However, the above methods still have the following shortcomings: First, physical capacity expansion requires engineering steps such as equipment selection, foundation construction, and line modification. In areas with limited conditions, construction is difficult and costly, and the construction period is long. Second, existing load control methods mainly achieve this by limiting user electricity consumption, which has an adverse impact on power supply quality. Furthermore, they fail to utilize the natural temporal and spatial complementarity of load peaks and valleys between adjacent transformer areas, resulting in long-term idle capacity in lightly loaded transformer areas while heavily loaded transformer areas face overload pressure. Third, existing research on the application of flexible interconnection devices mainly focuses on power flow optimization, lacking quantitative evaluation methods for the load complementarity characteristics of transformer areas. The installation location and capacity configuration of the devices lack a basis, and a closed-loop control and multi-transformer area collaborative scheduling method based on real-time load status has not been established. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the problem to be solved by this invention is how to address the technical issues of high cost and long cycle of existing physical capacity expansion methods, the impact of existing load regulation methods on power supply quality and failure to utilize the load complementarity potential between distribution stations, and the lack of quantitative configuration basis and real-time closed-loop collaborative control methods in the application of existing flexible interconnection devices.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: In a first aspect, embodiments of the present invention provide a flexible interconnection virtual dynamic capacity expansion method based on the load complementarity analysis of transformer substations, which includes obtaining the historical load operation characteristics of adjacent transformer substations and determining the load matching degree between each pair of transformer substations; Based on the load matching degree, determine the installation location pair and transmission capacity configuration of the flexible interconnection device, and continuously obtain the real-time load carrying status of each area pair; When the real-time load carrying status of the target area meets the preset triggering conditions, the power transfer constraint range is determined by combining the real-time load carrying status of the complementary area and the transmission capacity configuration. Within the power transfer constraint range, a power transfer command is generated to control the flexible interconnection device to perform power transfer. Based on the real-time load carrying status of the target transformer area after execution, it is determined whether the preset balancing target has been achieved. If not, the power transfer command is adjusted accordingly.

[0007] As a preferred embodiment of the flexible interconnection virtual dynamic capacity expansion method based on the load complementarity analysis of transformer substations described in this invention, the determination of the load matching degree between any two transformer substations includes comparing and analyzing the load distribution status of adjacent transformer substations in the same historical period to obtain the load matching degree used to characterize the degree of misalignment between peak and off-peak periods of load between transformer substations.

[0008] As a preferred embodiment of the flexible interconnection virtual dynamic capacity expansion method based on the load complementarity analysis of the transformer area described in this invention, the step of determining the installation location pair and transmission capacity configuration of the flexible interconnection device according to the load matching degree includes determining two transformer areas whose load matching degree meets the preset conditions as the transformer area pair, and determining the size of the transmission capacity configuration according to the load matching degree of the transformer area pair.

[0009] As a preferred embodiment of the flexible interconnection virtual dynamic capacity expansion method based on the load complementarity analysis of the distribution area described in this invention, when the real-time load carrying status of the target distribution area meets the preset triggering condition, it includes determining the real-time load carrying status of the target distribution area based on the real-time operation data of the transformer in the target distribution area, and taking the real-time load carrying status reaching the preset heavy load level as the preset triggering condition.

[0010] As a preferred embodiment of the flexible interconnection virtual dynamic capacity expansion method based on the load complementarity analysis of transformer areas described in this invention, the method includes: acquiring the real-time load carrying status of multiple transformer areas; The load balance degree is determined based on the real-time load carrying status of the multiple transformer areas; When the load balancing level is lower than the preset balancing standard, a coordinated adjustment scheme among the multiple transformer areas is determined based on the real-time load carrying status of the multiple transformer areas, and the power transfer command of the flexible interconnection device among the multiple transformer areas is adjusted according to the coordinated adjustment scheme. Based on the real-time load carrying status of the multiple transformer areas after adjustment, the load balancing degree is re-determined until the load balancing degree reaches the preset balancing standard.

[0011] As a preferred embodiment of the flexible interconnection virtual dynamic capacity expansion method based on the load complementarity analysis of the transformer substations described in this invention, the determination of the load balance degree includes evaluating the dispersion of the real-time load carrying status of the multiple transformer substations to obtain the load balance degree that reflects the consistency level of the load carrying status of the multiple transformer substations.

[0012] As a preferred embodiment of the flexible interconnection virtual dynamic capacity expansion method based on the load complementarity analysis of the distribution area described in this invention, the step of determining the coordinated adjustment scheme among the multiple distribution areas includes, for two distribution areas whose load bearing status deviation exceeds a preset range, redetermining the power transfer target of the flexible interconnection device between the two distribution areas, so as to reduce the deviation of the load bearing status of the multiple distribution areas.

[0013] Secondly, embodiments of the present invention provide a flexible interconnection virtual dynamic capacity expansion system based on the load complementarity analysis of transformer substations, which includes a complementarity analysis module for obtaining the historical load operation characteristics of adjacent transformer substations, determining the load matching degree between each pair of transformer substations, and determining the installation location and transmission capacity configuration of the flexible interconnection device based on the load matching degree. The load monitoring module is used to continuously acquire the real-time load carrying status of each transformer area; The capacity expansion control module is used to determine the power transfer constraint range by combining the real-time load bearing status of the complementary substation and the transmission capacity configuration when the real-time load bearing status of the target substation meets the preset triggering conditions, generate a power transfer command within the range, and control the flexible interconnection device to perform power transfer. The load balancing verification module is used to determine whether the preset load balancing target has been achieved based on the real-time load bearing status of the target area after execution. If the target has not been achieved, the module will send back the power transfer command to adjust the load balancing target. The collaborative scheduling module is used to obtain the load carrying status of each transformer area in the system, determine the load balance of the system, and when the load balance is lower than the preset balance standard, determine the collaborative adjustment scheme between transformer areas, and adjust the power transfer command of the flexible interconnection device between transformer areas according to the collaborative adjustment scheme.

[0014] Thirdly, embodiments of the present invention provide a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein: when the computer program instructions are executed by the processor, they implement the steps of the flexible interconnection virtual dynamic capacity expansion method for substation load complementarity analysis as described in the first aspect of the present invention.

[0015] Fourthly, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program instructions are executed by a processor, they implement the steps of the flexible interconnection virtual dynamic capacity expansion method for substation load complementarity analysis as described in the first aspect of the present invention.

[0016] The beneficial effects of this invention are as follows: The first step of this invention obtains the load matching degree by comparing and analyzing the historical load operation characteristics of adjacent transformer areas, solving the problem of lack of quantitative basis for the installation location and transmission capacity configuration of flexible interconnection devices, and making the device deployment match the actual complementary relationship of the transformer areas; The middle step determines the power transfer constraint range and executes the power transfer when the load bearing status of the target transformer area meets the triggering conditions, combining the status of complementary transformer areas and the transmission capacity configuration, avoiding reliance on the control method of restricting user power consumption, and realizing on-demand precise support for heavily loaded transformer areas; The final step judges whether the balance target has been achieved based on the load bearing status after execution and provides feedback for adjustment. At the same time, in the multi-transformer area scenario, it evaluates the system load balance degree and coordinates the adjustment of transformer area combinations whose deviation exceeds the preset range, avoiding insufficient transfer of a single transformer area or imbalance of system resource allocation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart of a flexible interconnection virtual dynamic capacity expansion method for load complementarity analysis of transformer substations; Figure 2 Computer equipment diagram for a flexible interconnection virtual dynamic capacity expansion method for load complementarity analysis of transformer substations; Figure 3 Another flowchart for the flexible interconnection virtual dynamic capacity expansion method for analyzing the load complementarity of transformer substations. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0022] Example 1 Reference Figure 1 This is the first embodiment of the present invention, which provides a flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis, including: S100: Obtain the historical load operation characteristics of adjacent transformer areas and determine the load matching degree between each pair of transformer areas.

[0023] S200: Determine the installation location and transmission capacity configuration of the flexible interconnection device based on the load matching degree, and continuously obtain the real-time load carrying status of each transformer area pair.

[0024] S300: When the real-time load bearing status of the target area meets the preset triggering conditions, the power transfer constraint range is determined by combining the real-time load bearing status and transmission capacity configuration of the complementary area. Within the power transfer constraint range, a power transfer command is generated to control the flexible interconnection device to perform power transfer.

[0025] S400: Determine whether the preset balance target has been achieved based on the real-time load bearing status of the target transformer area after execution. If not, it will send back an adjustment power transfer command.

[0026] It should be noted that there are inherent differences in peak and off-peak load periods between distribution substations. If the installation and configuration of flexible interconnection devices are determined solely based on the current load level of the substation, it is easy to overlook the misalignment of load timing between substations, resulting in a mismatch between the device installation location and transmission capacity configuration and the actual complementary relationship between the substations. At the same time, the load of the substation changes continuously over time. Judging whether power transfer is needed based solely on single or phased load data is difficult to adapt to the dynamic fluctuations of the load. Furthermore, it is necessary to further verify whether the load status of the substation has reached the expected level after the power transfer is executed. Otherwise, insufficient or excessive transfer may occur.

[0027] Therefore, the load matching degree between transformer substations is first determined based on the historical load operation characteristics of the substations, providing a basis for the installation location and transmission capacity configuration of the flexible interconnection device; then, the real-time load carrying status of the substations is continuously acquired, and when the target substation meets the triggering conditions, a power transfer command is generated and executed in combination with the status of the complementary substations and the transmission capacity configuration; finally, the load carrying status after execution is used to determine whether the preset balance target has been achieved, and if not, the power transfer command is adjusted, forming a complete closed-loop scheme from identification of substation complementarity to execution and verification of power transfer.

[0028] Example 2 Reference Figure 1 - Figure 3 This is the second embodiment of the present invention.

[0029] In this embodiment, step S100 involves acquiring the historical load operation characteristics of adjacent transformer substations and determining the load matching degree between each pair of substations, including the following step A1: A1: Determine the load matching degree between any two transformer substations, including comparing and analyzing the load distribution status of adjacent substations in the same historical period to obtain the load matching degree used to characterize the degree of misalignment between peak and off-peak periods of load between substations.

[0030] Specifically, the historical load operation characteristics of adjacent transformer substations are obtained, including: the three-phase current and three-phase voltage of the low-voltage side of the transformer in each substation are collected by the intelligent terminals (TTU, Terminal-Transformer-Unit, transformer substation intelligent terminal) deployed in each substation at a preset collection period, the measured total three-phase active load of each substation at the corresponding time is calculated, and the real-time load carrying status of the substation at that time is calculated according to formula (1): (1) In the formula, Let be the real-time load-bearing state of the i-th transformer at time t, which is dimensionless; Let be the measured total three-phase active power load of the i-th transformer station at time t, in kW; Let be the rated capacity of the transformer in the i-th zone, expressed in kVA.

[0031] by The overload threshold (85% of rated capacity, conforming to the recommended upper limit of normal operation in GB / T-1094.7) is used to determine the overload. This is the threshold for determining light load. When any unit in the area... When this occurs, the virtual capacity expansion control process is triggered; when adjacent transformer areas... At that time, it was listed as a candidate light load support area. It is the fundamental state variable for the entire process of this solution, updated once per minute, and is used in all subsequent calculation steps.

[0032] The preset collection period can be set according to the communication conditions of the transformer area. The real-time load carrying status continuously collected within the preset historical statistical period (such as multiple consecutive days) is arranged in chronological order to obtain the historical load operation characteristics of the transformer area. These characteristics reflect the distribution pattern of the transformer area load over time, providing a data basis for subsequent load matching degree calculation.

[0033] To determine the load matching degree between any two transformer substations, specifically, for any two adjacent transformer substations i and j, based on their historical load operation characteristics within the same historical statistical period and at the same data collection time, the load matching degree of transformer substation i to transformer substation j is calculated according to formula (2): (2) In the formula, , represents the load matching degree between transformer area i and transformer area j, which is dimensionless. The larger the value, the more transformer area j is in a low-load state when transformer area i is in a high-load state. The more obvious the misalignment between the peak and off-peak periods of the two transformer areas, the stronger the complementary potential. T is the total number of sampling points within the historical statistical period. , The historical load-bearing states of transformer substations i and j are calculated using formula (1), respectively. To ensure positive values ​​are taken during calculations, x is taken as x itself when x is greater than 0, and 0 is taken as x less than or equal to 0. This is used to count only the time periods when the load carrying capacity of transformer area i is higher than that of transformer area j, excluding invalid complementary situations where two transformer areas are simultaneously in a high load carrying capacity state.

[0034] By calculating each pair of adjacent transformer areas according to formula (2), a quantitative result that can characterize the degree of misalignment between peak and off-peak periods of load between transformer areas is obtained. This serves as the basis for determining the installation location and transmission capacity configuration. Furthermore, the historical statistical duration can be updated and recalculated periodically according to a preset cycle to reflect the dynamic trend of transformer area load characteristics changing with the seasons.

[0035] In this embodiment, step S200 determines the installation location pair and transmission capacity configuration of the flexible interconnection device based on the load matching degree, and continuously obtains the real-time load carrying status of each transformer area pair, including the following step B1: B1: Determine the installation location pair and transmission capacity configuration of the flexible interconnection device based on the load matching degree, including identifying two transformer areas whose load matching degree meets the preset conditions as transformer area pairs, and determining the size of the transmission capacity configuration based on the load matching degree of the transformer area pairs.

[0036] Specifically, the installation location and transmission capacity configuration of the flexible interconnection device are determined based on the load matching degree, including: comparing the load matching degree calculated by formula (2) for all pairs of adjacent transformer areas, selecting the transformer area pair with the largest load matching degree value and meeting the preset conditions, and installing the flexible interconnection device between the low-voltage busbars corresponding to the transformer area pair to realize the construction of a controllable power transmission channel between the two transformer areas.

[0037] The transmission capacity configuration of the flexible interconnection device is determined based on the load matching degree of the transformer area pair. Specifically, the power level corresponding to the load matching degree of the transformer area pair is rounded up according to the preset specifications to obtain the rated transmission power of the flexible interconnection device, which is used as the transmission capacity configuration. This ensures that the transmission capacity of the flexible interconnection device matches the actual complementary potential of the transformer area pair, avoiding resource waste due to over-selection of capacity or failure to meet complementary needs due to under-selection of capacity.

[0038] Transmission capacity configuration serves as one of the constraints on the equipment side during subsequent power transfer, providing a basis for formula (5) to determine the power transfer constraint range. The real-time load carrying status of each transformer area pair is continuously acquired. Specifically, the intelligent terminal of each transformer area pair continuously collects real-time electrical quantities and continuously calculates the real-time load carrying status of each transformer area according to formula (1). The data is then uploaded and summarized through the communication network for subsequent triggering and judgment.

[0039] In this embodiment, in step S300, when the real-time load carrying status of the target transformer area meets the preset triggering conditions, the power transfer constraint range is determined by combining the real-time load carrying status and transmission capacity configuration of the complementary transformer area. Within the power transfer constraint range, a power transfer command is generated, and the flexible interconnection device is controlled to perform power transfer. This includes the following C1 steps: C1: When the real-time load bearing status of the target transformer area meets the preset triggering conditions, including determining the real-time load bearing status of the target transformer area based on the real-time operation data of the transformer in the target transformer area, and taking the real-time load bearing status reaching the preset heavy load level as the preset triggering condition.

[0040] Specifically, when the real-time load carrying status of the target transformer area meets the preset triggering conditions, the following steps are taken: using the real-time load carrying status continuously calculated by formula (1) as the criterion, when the real-time load carrying status of a transformer area in the transformer area pair reaches the preset overload threshold λ_th, the transformer area is determined as the target transformer area, the preset overload threshold is used as the preset triggering condition, and the other transformer area in the transformer area pair is determined as the complementary transformer area; if the real-time load carrying status of the complementary transformer area itself also reaches or approaches the preset overload threshold, it is determined that the transformer area pair does not meet the support conditions, and the remaining transformer areas in the adjacent transformer areas that meet the preset conditions for load matching are re-selected as complementary transformer areas.

[0041] The power transfer constraint range is determined by combining the real-time load carrying status and transmission capacity configuration of the complementary transformer area. Specifically, the support requirements required for the target transformer area to recover to the safe range are calculated according to formula (3): (3) In the formula, The overload power of the target transformer area at time t exceeds the preset overload threshold, i.e., the required support power, in kW; The real-time load bearing status of the target transformer area is calculated using formula (1); The rated capacity of the transformer in the target distribution area; The calculation results are updated synchronously according to the preset data acquisition cycle, based on the dynamic changes in the real-time load bearing status of the target transformer area.

[0042] At the same time, calculate the upper limit of the power that the complementary transformer area can safely transfer to the outside according to formula (4): (4) In the formula, The upper limit of the transferable power of the complementary transformer area at time t, in kW; A safety margin is reserved to ensure that the load-bearing capacity of the complementary transformer area remains safe even after the power is transferred to other areas. The real-time load bearing status of the complementary transformer area is calculated using formula (1); The rated capacity of the transformer in the complementary distribution area is used. When the calculation result is less than or equal to 0, it is taken as 0, which means that the complementary distribution area itself has no transfer margin. At this time, other distribution areas that meet the load matching conditions are searched outside the distribution area pair as complementary distribution areas, and the above calculation process is repeated.

[0043] The physical meaning is: the transformer in substation j outputs additional power through SOP. back( (This requires an equivalent increase in power output), and the load factor just rises to... It remains within a safe operating range. hour, This indicates that the transformer area itself has no capacity, and the control module automatically presses the button. The sorting process switches to the next candidate lightly loaded station area. If all candidate stations have no available capacity, a main station alarm is triggered.

[0044] Taking into account the comprehensive support requirements, the upper limit of transferable power, and the rated transmission power corresponding to the transmission capacity configuration, the minimum value among the three is taken as the actual power transfer amount within the power transfer constraint range according to formula (5): (5) In the formula, The actual power transfer amount performed at time t; The rated transmission power of the flexible interconnect device corresponds to the transmission capacity configuration.

[0045] For example, when the support requirement is 120kW, the maximum transferable power is 150kW, and the rated transmission power corresponding to the transmission capacity configuration is 100kW, the minimum value of the three is taken according to formula (5), and the actual power transfer amount is determined to be 100kW. That is, the capacity on the equipment side is used as a limiting constraint to avoid exceeding the physical tolerance of the flexible interconnection device.

[0046] Within the power transfer constraints, a power transfer command is generated, and the flexible interconnect device is controlled to perform the power transfer. Specifically, The current reference value is converted into that of the dual-ended converter (VSC, voltage source converter) of the flexible interconnect device. The pulse width modulation (PWM) ratio of the converter is adjusted by vector control to drive the flexible interconnect device to transfer the corresponding power from the complementary substation side to the target substation side. The command issuance and execution process is transmitted in real time through the communication channel to shorten the response time from the fulfillment of the trigger condition to the completion of the power transfer.

[0047] In this embodiment, step S400 determines whether the preset balancing target has been achieved based on the real-time load bearing status of the target transformer area after execution. If not, an adjustment power transfer command is fed back, including the following steps D1-D3: D1: Includes obtaining the real-time load occupancy status of multiple transformer areas; The degree of load balancing is determined based on the real-time load occupancy status of multiple transformer substations. When the load balance is lower than the preset balance standard, a coordinated adjustment scheme between multiple transformer areas is determined based on the real-time load carrying status of multiple transformer areas, and the power transfer command of the flexible interconnection device between multiple transformer areas is adjusted according to the coordinated adjustment scheme. Based on the real-time load carrying status of multiple transformer substations after adjustment, the load balance level is re-determined until the load balance level reaches the preset balance standard.

[0048] Specifically, refer to Figure 3 The determination of whether the preset load balancing target has been achieved is based on the real-time load carrying status of the target transformer area after execution, including: after the power transfer is executed, the equivalent load carrying status of the target transformer area is calculated according to formula (6): (6) In the formula, This represents the equivalent load-bearing status of the target transformer area after virtual capacity expansion. The measured total three-phase active power load before the target transformer area is transferred in formula (1); The actual power transfer amount performed by formula (5); The rated capacity of the transformer in the target distribution area.

[0049] The equivalent load carrying status is compared with the preset overload threshold. If the equivalent load carrying status is lower than the preset overload threshold, it is determined that the preset balance target has been achieved and the current power transfer command is maintained. If the equivalent load carrying status is still not lower than the preset overload threshold, it is determined that the preset balance target has not been achieved and the power transfer command is adjusted. Specifically, the candidate complementary substations that meet the preset conditions for load matching are searched again in the adjacent substations, and the support demand and transferable power limit corresponding to formula (3) and formula (4) are recalculated for the newly determined substations to form a feedback adjustment process at the single substation level.

[0050] The real-time load carrying status of multiple transformer areas is obtained. Specifically, the equivalent load carrying status of each transformer area is obtained by formula (6) and used as the input for determining the load balance degree.

[0051] D2: Determine the load balance level, including evaluating the dispersion of the real-time load carrying status of multiple transformer areas to obtain the load balance level that reflects the consistency of the load carrying status of multiple transformer areas.

[0052] Specifically, the load balancing degree is calculated according to formula (7): (7) In the formula, denoted as the load balance degree at time t, the closer the value is to 1, the more balanced the load bearing status of each transformer area is, and the smaller the value is, the greater the difference in the load bearing status of each transformer area is; N is the total number of transformer areas. The equivalent load-bearing state of the i-th transformer area is calculated using formula (6); It is the arithmetic mean of the equivalent load-bearing status of all transformer substations within the substation.

[0053] The load balance level is continuously updated according to a preset cycle. It is used to assess the consistency of load distribution among different transformer areas from an overall perspective. It works in conjunction with the judgment at the D1 single transformer area level to form assessment results at both the local and overall levels.

[0054] D3: Determine a coordinated adjustment scheme among multiple transformer substations, including redetermining the power transfer target of the flexible interconnection device between two transformer substations whose load bearing status deviation exceeds a preset range, in order to reduce the deviation of the load bearing status among multiple transformer substations.

[0055] Specifically, when the load balance is lower than the preset balance standard, for the combination of transformer substations whose internal equivalent load bearing status deviates from the arithmetic mean by more than the preset range, they are re-determined as transformer substation pairs to be adjusted. For the transformer substation pairs to be adjusted, the corresponding support demand calculation, transferable power limit calculation, power transfer amount determination and equivalent load bearing status calculation of formulas (3) to (6) are re-executed. Based on this, the power transfer command of the flexible interconnection device between the transformer substation pairs to be adjusted is adjusted.

[0056] The above process is repeated for all transformer area combinations that meet the adjustment conditions. The load balance is recalculated according to formula (7). The recalculated result is compared with the preset balance standard. If the preset balance standard is still not met, the adjustment is continued for transformer area combinations whose deviation exceeds the preset range until the load balance reaches the preset balance standard, thus forming a cyclical process of multi-transformer area coordinated scheduling.

[0057] Virtual capacity expansion ratio quantification: After each power transfer is completed, the control execution module calculates the impact of this operation on the transformer area. The equivalent virtual capacity expansion ratio serves as a core display indicator to intuitively demonstrate the capacity expansion effect to operations and maintenance personnel. (8) In the formula, The instantaneous virtual capacity increase ratio for transformer area i at time t is expressed as % . The actual transferred active power in formula (5) is expressed in kW. The rated capacity of transformer i in the distribution area is expressed in kVA. The comprehensive power factor of transformer area i on the load side is determined by the statistical average of historical operating data over the past 30 days (the typical value for transformer areas in mountainous residential areas is 0.90).

[0058] Will Divide by The ratio of the apparent power (converted to apparent power) to the rated capacity is the equivalent virtual capacity increase ratio. For example, when... =100kW =400kVA When =0.90, This translates to approximately 111 kVA in apparent power, which corresponds to a virtual capacity increase of about 27.8% compared to the rated capacity of 400 kVA for the distribution area. The time series is also used as one of the inputs for the comprehensive evaluation of formula (11), reflecting the dynamic level of virtual capacity expansion capability.

[0059] Annual cumulative statistics on virtual power transfers: The benefit evaluation module accumulates and integrates the power transfer volume at all times throughout the year in 1-hour increments to calculate the annual virtual power transfer volume. (9) In the formula, The total amount of virtual electricity transferred annually through flexible interconnection, expressed in kWh. The actual execution value of formula (5) in each time period is expressed in kW; The integral step size is given; the summation covers 8760 hours throughout the year.

[0060] This comprehensively reflects the cumulative contribution of flexible interconnection devices to the power supply capacity of heavily loaded distribution areas over the entire year, and is the direct basis for calculating the annual economic benefits of formula (10).

[0061] Annual net economic benefit assessment and scheme comparison: The benefit assessment module calculates the annual net economic benefit of the flexible interconnection virtual capacity expansion scheme relative to the traditional physical capacity expansion scheme based on the annual transferred electricity and average annual virtual capacity increase in formula (9): (10) In the formula, The net economic benefit is expressed in yuan per year. The price is the local comprehensive electricity price, expressed in yuan / kWh, and is determined based on local electricity price documents (the typical value for residential and commercial comprehensive electricity prices in mountainous cities is 0.58 yuan / kWh). The annual virtual transfer amount is given by formula (9); The cost of expanding the capacity of traditional transformer substations is calculated in yuan / (kVA·year) based on historical project settlement data (including equipment purchase, mountain construction, and operation and maintenance) at an annualized rate (typical value is 280 yuan / (kVA·year)). The average virtual capacity increase for the whole year is expressed in kVA, derived from formula (8). The result was obtained by averaging over time. The annual operation and maintenance cost of the SOP device is expressed in yuan per year and is calculated as 2% of the device purchase cost. A value greater than 0 indicates that the plan has positive economic benefits. The ratio of the investment to the initial investment in the SOP device is the annualized rate of return. The payback period is calculated based on this, and the results are output to the operation and maintenance management system as the basis for the annual benefit report.

[0062] Comprehensive system performance evaluation and outer layer optimization decision-making: The benefit evaluation module considers three dimensions—system balance, overload elimination effect, and virtual capacity expansion ratio—to calculate the overall performance index of the solution, serving as the outer-layer decision-making basis for "whether to adjust the flexible interconnect configuration." (11) In the formula, This is a comprehensive performance evaluation index for the system, with a value range of [value range missing]. The closer the value is to 1, the better the overall performance. The time average of formula (7) within the statistical period reflects the long-term equilibrium level of the system. The percentage of annual operating time without overload, of which For any transformer area, the equivalent load rate exceeds The annual cumulative number of hours (obtained by formula (6) for statistical analysis of all times throughout the year). A larger value indicates fewer overload events; The time average of formula (8) within the statistical period (in %); The virtual capacity expansion target value is based on the results of the transformer area complementarity analysis. Determine, used to Normalization to Scope; weighting coefficient , , The Analytic Hierarchy Process (AHP) was used to determine the priority levels. A pairwise comparison matrix was constructed with "overload elimination" as the first priority, "system balancing" as the second priority, and "capacity increase ratio" as the third priority. After a consistency test (CR < 0.10), the results were obtained. =0.35、 =0.45、 =0.20, the sum of the three is 1. When If the solution is deemed to have excellent performance, maintain the current configuration and monitor it continuously; when When the value is less than 0.70, outer layer optimization is triggered. The system returns to the second step to re-analyze complementarity, considering adjusting the SOP installation location or increasing the device capacity to form the outermost closed loop at the scheme level.

[0063] Example 3 Reference Figure 2 This is the third embodiment of the present invention, which provides a case study analysis and simulation verification.

[0064] This example is based on simulation verification using actual 10kV / 0.4kV low-voltage distribution network data from a residential community in a mountainous city in southwestern China. This distribution network comprises three adjacent transformer substations: Substation A (rated capacity 400kVA, purely residential, peak consumption period 18:00-22:00, average annual load factor approximately 1.04, annual overload duration approximately 876 hours), Substation B (rated capacity 400kVA, mixed commercial and residential use, peak daytime consumption period 9:00-17:00, average nighttime load factor approximately 0.42), and Substation C (rated capacity 315kVA, small commercial use, significant daytime peak load on weekdays, and deep light load at night and on weekends). Based on measured historical data (sampling step 1 hour, totaling 8760 time points), dynamic load models for each substation were built on the MATLAB / Simulink platform to verify the entire process of the virtual dynamic capacity expansion method proposed in this patent.

[0065] The timing complementarity index of each transformer substation pair was calculated, and the results are shown in Table 1. The complementarity index between transformer substation A and transformer substation B is the largest, and they are determined as the preferred installation locations, with the SOP planned capacity rounded to 100kW. The complementarity index between transformer substation A and transformer substation C is 0.15, and they are listed as alternative options.

[0066] Table 1. Inter-station temporal complementarity index matrix

[0067] After installing a 100kWSOP between transformer substations A and B, it operates according to the control strategy from step three to step seven. The virtual capacity expansion control effect is shown in Table 2.

[0068] Table 2 Comparison of Virtual Capacity Increase Control Effects (Area A)

[0069] Further comparison of this scheme with the traditional physical capacity expansion scheme (replacing the 400kVA transformer with a 630kVA transformer) is shown in Table 3.

[0070] Table 3. Comprehensive Comparison of This Plan and Traditional Capacity Expansion Plans

[0071] The SOP flexible interconnection device occupies only about 5.2m² of floor space (including cable trays and safety distances). 2 Compared to the 16.8m of traditional transformer expansion projects 2 The area is reduced by 69.0%, which shows significant feasibility in high-density residential areas in mountainous cities.

[0072] Example 4 Reference Figure 2 This is the fourth embodiment of the present invention.

[0073] The above is a schematic scheme of a flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis. It should be noted that the technical solution of this flexible interconnection virtual dynamic capacity expansion system based on transformer area load complementarity analysis belongs to the same concept as the technical solution of the aforementioned flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis. Details not described in detail in this embodiment of the flexible interconnection virtual dynamic capacity expansion system based on transformer area load complementarity analysis can be found in the description of the aforementioned flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis.

[0074] This embodiment also provides a flexible interconnection virtual dynamic capacity expansion system based on the load complementarity analysis of distribution areas, including: a complementarity analysis module, used to obtain the historical load operation characteristics of adjacent distribution areas, determine the load matching degree between each pair of distribution areas, and determine the installation location and transmission capacity configuration of the flexible interconnection device according to the load matching degree; The load monitoring module is used to continuously acquire the real-time load carrying status of each transformer area; The capacity expansion control module is used to determine the power transfer constraint range by combining the real-time load bearing status of the complementary substation and the transmission capacity configuration when the real-time load bearing status of the target substation meets the preset triggering conditions. Within this range, it generates a power transfer command and controls the flexible interconnection device to perform power transfer. The load balancing verification module is used to determine whether the preset load balancing target has been achieved based on the real-time load bearing status of the target area after execution. If not, it will send back an adjustment power transfer command. The collaborative scheduling module is used to obtain the load carrying status of each transformer area in the system, determine the load balance of the system, and when the load balance is lower than the preset balance standard, determine the collaborative adjustment scheme between transformer areas and adjust the power transfer command of the flexible interconnection device between transformer areas according to the collaborative adjustment scheme.

[0075] This embodiment also provides an electronic device applicable to the flexible interconnection virtual dynamic capacity expansion scenario for transformer area load complementarity analysis, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the flexible interconnection virtual dynamic capacity expansion method for transformer area load complementarity analysis as proposed in the above embodiment.

[0076] This embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements the flexible interconnection virtual dynamic capacity expansion method for realizing the load complementarity analysis of distribution areas as proposed in the above embodiments.

[0077] The storage medium proposed in this embodiment and the flexible interconnection virtual dynamic capacity expansion method for realizing the load complementarity analysis of distribution areas proposed in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0078] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis, characterized in that: This includes obtaining historical load operation characteristics of adjacent transformer substations and determining the load matching degree between each pair of substations; Based on the load matching degree, determine the installation location pair and transmission capacity configuration of the flexible interconnection device, and continuously obtain the real-time load carrying status of each area pair; When the real-time load carrying status of the target area meets the preset triggering conditions, the power transfer constraint range is determined by combining the real-time load carrying status of the complementary area and the transmission capacity configuration. Within the power transfer constraint range, a power transfer command is generated to control the flexible interconnection device to perform power transfer. Based on the real-time load bearing status of the target transformer area after execution, it is determined whether the preset balancing target has been achieved. If not, the power transfer command is adjusted accordingly.

2. The flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis as described in claim 1, characterized in that: Determining the load matching degree between any two transformer substations includes comparing and analyzing the load distribution status of adjacent substations within the same historical period to obtain a load matching degree that characterizes the degree of misalignment between peak and off-peak load periods between substations.

3. The flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis as described in claim 2, characterized in that: The step of determining the installation location pair and transmission capacity configuration of the flexible interconnect device based on the load matching degree includes determining two substations that meet preset conditions as the substation pair, and determining the size of the transmission capacity configuration based on the load matching degree of the substation pair.

4. The flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis as described in claim 3, characterized in that: When the real-time load carrying status of the target transformer area meets the preset triggering condition, the process includes determining the real-time load carrying status of the target transformer area based on the real-time operation data of the transformer in the target transformer area, and taking the real-time load carrying status reaching the preset heavy load level as the preset triggering condition.

5. The flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis as described in claim 4, characterized in that: This includes obtaining the real-time load occupancy status of multiple transformer substations; The load balance degree is determined based on the real-time load carrying status of the multiple transformer areas; When the load balancing level is lower than the preset balancing standard, a coordinated adjustment scheme among the multiple transformer areas is determined based on the real-time load carrying status of the multiple transformer areas, and the power transfer command of the flexible interconnection device among the multiple transformer areas is adjusted according to the coordinated adjustment scheme. Based on the real-time load carrying status of the multiple transformer areas after adjustment, the load balancing degree is re-determined until the load balancing degree reaches the preset balancing standard.

6. The flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis as described in claim 5, characterized in that: Determining the load balance degree includes evaluating the dispersion of the real-time load carrying status of the multiple transformer areas to obtain the load balance degree that reflects the consistency level of the load carrying status of the multiple transformer areas.

7. The flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis as described in claim 6, characterized in that: The step of determining the coordinated adjustment scheme among the multiple transformer substations includes, for two transformer substations whose load bearing status deviation exceeds a preset range, redetermining the power transfer target of the flexible interconnection device between the two transformer substations, so as to reduce the deviation of the load bearing status of the multiple transformer substations.

8. A flexible interconnection virtual dynamic capacity expansion system based on transformer area load complementarity analysis, and a flexible interconnection virtual dynamic capacity expansion method based on transformer area load complementarity analysis as described in any one of claims 1-7, characterized in that: It also includes a complementarity analysis module, which is used to obtain the historical load operation characteristics of adjacent transformer areas, determine the load matching degree between each pair of transformer areas, and determine the installation location and transmission capacity configuration of the flexible interconnection device based on the load matching degree; The load monitoring module is used to continuously acquire the real-time load carrying status of each transformer area; The capacity expansion control module is used to determine the power transfer constraint range by combining the real-time load bearing status of the complementary substation and the transmission capacity configuration when the real-time load bearing status of the target substation meets the preset triggering conditions, generate a power transfer command within the range, and control the flexible interconnection device to perform power transfer. The load balancing verification module is used to determine whether the preset load balancing target has been achieved based on the real-time load bearing status of the target area after execution. If the target has not been achieved, the module will send back the power transfer command to adjust the load balancing target. The collaborative scheduling module is used to obtain the load carrying status of each transformer area in the system, determine the load balance of the system, and when the load balance is lower than the preset balance standard, determine the collaborative adjustment scheme between transformer areas, and adjust the power transfer command of the flexible interconnection device between transformer areas according to the collaborative adjustment scheme.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the flexible interconnection virtual dynamic capacity expansion method for load complementarity analysis of distribution areas as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the flexible interconnection virtual dynamic capacity expansion method for load complementarity analysis of distribution areas as described in any one of claims 1-7.

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