Power system provincial and local cooperative load cutting control method and system

Abstract

The invention discloses a provincial and regional collaborative load shedding control method and system for a power system, and relates to the technical field of power grid load shedding distribution management, and the method comprises the steps: dividing load shedding objects according to a power supply mode, and obtaining the historical data of each key load in each load shedding object; power supply reliability is used as an evaluation standard, a priority evaluation model of each key load is constructed according to historical data, and it is ensured that the key load with low power supply reliability can obtain a higher priority in a load cutting strategy; and the provincial dispatching control system distributes the load cutting tasks of the various load cutting objects to the local dispatching control system and the distribution dispatching control system according to the priority of the key load and the real-time proportion of the various load cutting objects. The method has the beneficial effects that the maximum protection of the key load is ensured, and meanwhile, the influence on the non-key load is minimized.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid load shedding distribution management, and in particular to a power system land-saving coordinated load shedding control method and system. Background Art

[0002] Traditional technologies often adopt a relatively rough load control method with a large load shedding range, which makes it difficult to ensure that critical loads are protected to the greatest extent. At the same time, the impact on non-critical loads is not minimized. In addition, when making load shedding decisions, the actual adjustable capacity and real-time status information of various regions and types of loads are not fully considered, resulting in an uneven distribution of load shedding targets, and even the situation where the load shedding target is inconsistent with the actual cuttable capacity. Furthermore, there is a lack of effective monitoring and classified statistics of different types of load resources such as dedicated lines, dedicated transformers, and public lines, resulting in an inability to fully grasp the precise load shedding adjustment capabilities of various regions. Finally, the existing feedback mechanism is lacking, and it is difficult for the provincial dispatching department to monitor the load-carrying capacity and status of various regions in real time, thereby weakening the power-limiting and load-shedding effect of the coordinated provincial and local distribution. Summary of the invention

[0003] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0004] Therefore, an object of the present invention is to provide a land-saving coordinated load shedding control method for an electric power system, which ensures maximum protection of critical loads while minimizing the impact on non-critical loads.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a method for controlling load shedding in a power system in a provincial and local coordinated manner, which comprises dividing the load shedding objects according to the power supply mode, and obtaining the historical data of each key load in each type of load shedding objects; taking the power supply reliability as the evaluation standard, constructing a priority evaluation model for each key load according to the historical data, to ensure that the key loads with lower power supply reliability can obtain a higher priority in the load shedding strategy; the provincial dispatching control system respectively distributes the load shedding tasks of each type of load shedding objects to the local dispatching and distribution dispatching control systems according to the priority of the key loads and the real-time proportion of each type of load shedding objects.

[0006] As a preferred scheme of the power system land-saving coordinated load shedding control method described in the present invention, the priority evaluation model for each key load is constructed based on historical data, including the following steps: determining the priority factor of each load as an evaluation indicator of the priority evaluation model; introducing a standard deviation for adjusting the sensitivity of the priority factor to changes in power supply reliability; by obtaining the power supply reliability, calculating the integral of the power supply unreliability in the entire evaluation period, so as to quantify the risk and instability of the corresponding load in the evaluation period.

[0007] As a preferred scheme of the power system land-saving coordinated load shedding control method described in the present invention, the obtaining of power supply reliability specifically includes the following steps: introducing an indicator function that can indicate whether each load has a power outage at any time point, and obtaining the total power outage time of each load within the evaluation period; calculating the power supply reliability of each load within the evaluation period based on the total time of the evaluation period and the total power outage time of each load within the evaluation period.

[0008] As a preferred scheme of the provincial and local coordinated load shedding control method for the power system described in the present invention, it comprises: formulating load shedding ratio rules and control logic for various types of load shedding objects in various regions to regulate the load during the load shedding process; on the basis of the load batch control coordination function of the provincial dispatching system, adding resource pool monitoring and statistical functions, load shedding quantity allocation function and control process monitoring function; and adding resource pool monitoring, statistical and data allocation functions to the local dispatching system.

[0009] As a preferred scheme of the provincial and local coordinated load shedding control method of the power system described in the present invention, the load shedding ratio rules and control logic for various types of load shedding objects in various regions also include the following rules: if the priority weight of the load shedding object is high and the real-time proportion is low, the lower limit of the load shedding ratio is set to ensure that the critical load will not be over-shed; if the priority weight of the load shedding object is low, the load shedding ratio is appropriately increased according to the real-time proportion to balance the system load; in an emergency, such as serious overload of the power grid, the priority weight is temporarily ignored, and the load is directly shelved according to the real-time proportion to quickly reduce the system load; the load shedding ratio rules are regularly evaluated and updated to adapt to changes in the power grid structure and load characteristics.

[0010] As a preferred solution of the power system land-saving coordinated load shedding control method described in the present invention, the load shedding objects are specifically dedicated line power supply, dedicated transformer power supply and public line power supply.

[0011] As a preferred scheme of the provincial and local coordinated load shedding control method of the power system described in the present invention, all load shedding is carried out in the order of dedicated lines, dedicated transformers and public lines, and the load shedding amount and load shedding type of the units participating in the load shedding are determined on the provincial dispatching side. When the dedicated line resources are exhausted, the dedicated transformers are pulled first, and the public lines are allowed to be pulled only after all are exhausted.

[0012] To further solve the above technical problems, the present invention provides the following technical solutions: a power system provincial and local coordinated load shedding control system, including a master control module, which realizes effective management and load shedding control of key loads under various power supply modes through the coordinated work of provincial, local and dispatching control systems; a data acquisition and analysis module, which divides the load shedding objects according to the power supply mode and collects and stores the historical data of each key load to provide a basis for subsequent evaluation; a priority evaluation module, which builds a priority evaluation model based on power supply reliability, quantifies risks and instability, and determines the priority of each load; a reliability calculation module, which counts the power outage time through an indicator function, calculates the power supply reliability of each load within the evaluation period, and supports priority evaluation; a load distribution and monitoring module, which formulates load shedding ratio rules and enhances the resource pool monitoring and allocation functions in the provincial dispatching and local dispatching systems to ensure accurate control of the load shedding process; a dynamic adjustment module, which sets a lower limit of the load shedding ratio to protect high-priority loads, and flexibly adjusts the load shedding ratio of low-priority loads according to real-time conditions, and regularly optimizes the rules to adapt to changes; a load shedding sequence management module, which performs load shedding operations in the order of dedicated lines, dedicated transformers, and public lines, and implements limited load shedding on some high-priority public line loads when necessary to ensure system stability.

[0013] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of the above-mentioned power system land-saving coordinated load shedding control method are implemented.

[0014] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of the above-mentioned power system land-saving coordinated load shedding control method are implemented.

[0015] Beneficial effects of the present invention: The present invention significantly improves the accuracy and efficiency of load shedding operations in emergency situations by finely dividing load shedding objects, constructing a priority evaluation model based on power supply reliability, and optimizing the coordination mechanism between provinces and regions, ensuring the maximum protection of critical loads while minimizing the impact on non-critical loads, and improving the stability and reliability of the system by dynamically adjusting the load shedding ratio rules and enhancing the resource pool monitoring and allocation functions, thereby ensuring the safe and efficient operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1It is an overall flow chart of the land-saving coordinated load shedding control method of the power system of the present invention.

[0018] Figure 2 This is a framework diagram of the method for classifying resources based on dedicated lines, dedicated transformers, and public lines of the present invention.

[0019] Figure 3 This is a flow chart of the classification and batching precise load shedding distribution strategy of the present invention.

[0020] Figure 4 This is the precise load shedding capacity data summary interface of the present invention.

[0021] Figure 5 It is the precise load shedding control interface of the present invention.

[0022] Figure 6 This is the precise load shedding order history interface of the present invention. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] 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 term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0026] Example 1

[0027] Reference Figure 1 , which is the first embodiment of the present invention, and provides a method for controlling load shedding in a power system by using land-saving coordinated load shedding, comprising:

[0028] S1: Divide the load shedding objects according to the power supply mode, and obtain the historical data of each key load in each type of load shedding object.

[0029] It should be noted that the load shedding objects are specifically dedicated power supply, dedicated transformer power supply and public power supply.

[0030] Among them, the control body of dedicated line load shedding is the local dispatching system, the control body of dedicated transformer load shedding is the distribution network system, and the control body of public line load shedding is the local dispatching system; the allocation ratio logic and control logic are introduced, and in the provincial dispatching system, the three types of resource allocation and control process monitoring functions of resource pool monitoring and statistics, load shedding quantity allocation, and calculation based on load shedding quantity are established; in the local dispatching system, the resource pool monitoring screen and statistics are established, and the resource pool data allocation is added to the command receiving part; in the provincial and local coordinated control, the control mode is the parallel execution of system commands at all levels of province-local-distribution, and the provincial dispatching command includes the line selection type of "dedicated line + dedicated transformer". While the local dispatching performs dedicated line resource selection control according to the command, it issues dedicated transformer control commands to the distribution dispatching, and supports the provincial dispatching to issue multiple commands to the region in a short period of time.

[0031] It should also be noted that based on the real-time capacity of dedicated lines, dedicated transformers and public lines counted by the provincial dispatching department, all load shedding is, in principle, carried out in the order of dedicated lines, dedicated transformers and public lines. The load shedding amount and type of the units participating in the load shedding are decided on the provincial dispatching side. When dedicated line resources are exhausted, dedicated transformers are pulled first, and public lines are allowed only after all are exhausted.

[0032] It should also be noted that since load shedding is performed only based on real-time capacity, the importance of different loads is ignored. Some critical loads (such as hospitals, fire stations, etc.) have extremely high requirements for continuous power supply. If load shedding is performed only based on real-time capacity, these critical loads may be mistakenly cut off, leading to serious social and economic consequences. Moreover, in an emergency, if the priority weight is not considered and the order of load shedding is determined solely based on real-time capacity, it may not be possible to effectively protect those facilities that are critical to social stability and security. In addition, once critical loads are mistakenly cut off, it often takes more time and resources to restart these loads, increasing the difficulty of restoring normal operation of the system. Therefore, in addition to considering real-time capacity, it is also necessary to combine the priority weights of critical loads to ensure that these critical facilities can continue to receive power supply in an emergency.

[0033] S2: Using power supply reliability as the evaluation criterion, a priority evaluation model for each key load is constructed based on historical data to ensure that key loads with lower power supply reliability can obtain higher priority in the load shedding strategy.

[0034] It should be noted that the acquired historical data is used to establish a priority evaluation model for critical loads and further analyze them. Therefore, the historical data in this embodiment mainly includes but is not limited to: historical data of critical loads of dedicated power supply (the number and duration of dedicated power supply interruptions, the voltage and current stability records of dedicated power supply, the load demand change trend of dedicated power supply, the fault maintenance records of dedicated power supply, and the equipment operation efficiency data of dedicated power supply), historical data of critical loads of dedicated transformer power supply (transformer load rate records of dedicated transformer power supply, transformer fault and maintenance history, monitoring data of transformer oil temperature, oil level and other status parameters, power quality data of dedicated transformer power supply (such as harmonics content, power factor, etc.) and power supply reliability statistics of special transformer power supply) as well as historical data of key loads of public power supply (line load rate records of public power supply, line failure and maintenance history, line loss and efficiency data, voltage and current fluctuation records of public power supply, and power outage statistics in public power supply areas); these historical data will be used to analyze the operating characteristics of each key load and evaluate its priority in the power system, so as to give priority to the power supply of key loads when the power supply is tight. It can also optimize the grid structure and power supply mode according to the needs of key loads, and quickly identify and ensure the power supply of key loads under grid failure or extreme weather conditions.

[0035] Furthermore, the priority evaluation model of each key load is constructed based on historical data, including the following steps:

[0036] S201: Determine the priority factor of each load as an evaluation index of a priority evaluation model;

[0037] S202: introducing a standard deviation for adjusting the sensitivity of the priority factor to changes in power supply reliability;

[0038] S203: By obtaining the power supply reliability, the integral of the power supply unreliability in the entire evaluation period is calculated to quantify the risk and instability of the corresponding load in the evaluation period.

[0039] Based on the construction ideas of the above priority evaluation model and the historical data obtained, the priority evaluation model can be expressed as:

[0040]

[0041] Among them, P i is the priority factor of the i-th load shedding object, and its value range is (0, 1], where the closer the value is to 1, the higher the priority of the load; σ i The standard deviation of the priority of the i-th load shedding object reflects the volatility of the priority factor. The larger the standard deviation, the more unstable the priority of the load shedding object. i(t′) is the reliability index of the i-th load shedding object at time t′, and its value range is [0, 1], where 1 means completely reliable, 0 means completely unreliable, and 1-R i (t′) 2 The influence of unreliability on the priority factor is magnified by square. When R i When (t′) is close to 0, 1-R i (t′) 2 The value will become larger, thereby reducing P i The value of t 0 and t are the start and end time of the evaluation period, respectively; exp(·) is an exponential function used to map the input value to the interval (0, +∞) to ensure that the priority factor is always positive.

[0042] Furthermore, the obtaining of power supply reliability specifically includes the following steps:

[0043] S2031: introducing an indicator function that can indicate whether each load has a power outage at any time point, and obtaining the total power outage time of each load within the evaluation period;

[0044] S2032: Calculate the power supply reliability of each load during the evaluation period based on the total time of the evaluation period and the sum of the power outage time of each load during the evaluation period.

[0045] It should be noted that based on the calculation idea of ​​power supply reliability, it can be expressed as:

[0046]

[0047] Among them, (U i (t′) is an exponential function. When the i-th load shedding object is in a power outage state at time t′, (U i (t′)=1, when the i-th load shedding object is in normal power supply state at time t′, (U i (t′) = 0; It represents the total power outage time of the i-th load shedding object during the evaluation period.

[0048] Combining the above two formulas, it can be concluded that the specific implementation steps of step S2 in this embodiment are:

[0049] Calculate the priority factor of each load shedding object to determine the load shedding order and ensure that the critical loads are protected to the greatest extent;

[0050] Input the historical data of key loads of dedicated lines, dedicated transformers, and public lines (power outage times, duration, load demand, fault records, etc.) and the time period used to calculate power supply reliability;

[0051] The priority factor can be comprehensively evaluated based on expert experience, load importance, historical power outage data, etc.

[0052] Define the exponential function (U i (t′) is used to indicate whether the load is powered off at time t′, (U i (t′)=1 indicates power outage, (U i (t′)=0 means power supply;

[0053] Traverse all time points in the evaluation period, calculate the total power outage time of each load according to the indicator function, and determine the start time and end time of the evaluation period;

[0054] Calculate the power supply reliability of each load based on the total power outage time and the total evaluation period time;

[0055] A priority standard deviation is introduced for each load to adjust the sensitivity of the priority factor to changes in power supply reliability. The larger the standard deviation, the more unstable the priority of the load is and the more sensitive it is to changes in power supply reliability.

[0056] Calculate the power supply unreliability score of each load during the assessment period to quantify its risk and instability during the assessment period. The larger the score, the higher the risk and instability of the load.

[0057] Substitute the above calculation results into the formula to calculate the priority factor of each load;

[0058] Determine the priority ranking of each load based on the calculated priority factors;

[0059] During the load shedding process, loads with lower priority are removed first to ensure power supply to critical loads.

[0060] S3: The provincial dispatching control system allocates the load shedding tasks of various load shedding objects to the local dispatching and distribution control systems according to the priority of the critical loads and the real-time proportion of various load shedding objects.

[0061] Furthermore, it also includes:

[0062] S301: Formulate load shedding ratio rules and control logic for various types of load shedding objects in various regions to regulate the load during the load shedding process;

[0063] S302: Based on the load batch control coordination function of the provincial dispatching system, resource pool monitoring and statistical functions, load shedding distribution function and control process monitoring function are added;

[0064] S303: The geological survey system adds resource pool monitoring, statistics and data allocation functions.

[0065] It should be noted that the provincial dispatching control system sends the load shedding task instructions to the local dispatching and distribution dispatching control systems according to the load shedding ratio rules. The instructions should include information such as the load shedding object type (dedicated line, dedicated transformer, public line) and load shedding amount. The local dispatching and distribution dispatching control systems execute the load shedding operation according to the received instructions and feed back the execution results to the provincial dispatching control system. The feedback information should include information such as the load shedding object, load shedding amount, and execution status. The provincial dispatching control system monitors the load shedding process in real time to ensure that the load shedding operation is carried out as planned and makes dynamic adjustments based on actual conditions.

[0066] Furthermore, the load shedding ratio rules and control logic for various types of load shedding objects in various regions also include the following rules:

[0067] S3011: If the priority weight of the load shedding object is high but the real-time proportion is low, a lower limit of the load shedding proportion is set to ensure that the critical load is not over-shedded;

[0068] S3012: If the priority weight of the load shedding object is low, appropriately increase the load shedding ratio according to the real-time proportion to balance the system load;

[0069] S3013: In an emergency, such as when the power grid is seriously overloaded, the priority weight is temporarily ignored and the load is directly cut according to the real-time proportion to quickly reduce the system load;

[0070] S3014: Regularly evaluate and update the load shedding ratio rules to adapt to changes in the grid structure and load characteristics.

[0071] It should be noted that the setting of the lower limit should take into account factors such as the priority, importance, and power outage tolerance of critical loads. For example, for critical loads such as hospitals and fire stations, the lower limit of the load shedding ratio should be set lower to ensure that they can obtain sufficient power supply when the power supply is tight; the setting of the lower limit is not fixed and should be dynamically adjusted according to actual conditions. For example, when the load demand of the critical load increases or the power supply reliability decreases, the lower limit of the load shedding ratio should be appropriately lowered to ensure that its power supply demand is met.

[0072] Example 2

[0073] Reference Figure 2 to Figure 6 , which is the second embodiment of the present invention, and which is different from the first embodiment in that it also includes an implementation method and strategy for accurate load shedding based on real-time proportion.

[0074] First, the load shedding resource types are subdivided into private lines, private transformers, and public lines;

[0075] Gather resource pool models and real-time status from various regions, and classify and conduct statistical analysis on resource pool information in batches. Build a real-time monitoring function for resource pools, classify load shedding resources according to the load shedding control subject, and divide load shedding resources into three types of resources: dedicated line load shedding, dedicated transformer load shedding, and public line load shedding. Gather and display various capabilities including the entire network, accident power rationing, super-network supply, special sections, plants and stations.

[0076] The control body of dedicated line load shedding is the ground dispatching system, the control body of dedicated transformer load shedding is the distribution network system, and the control body of public line load shedding is the ground dispatching system.

[0077] According to the selected areas, sequences, plants, stations, plans and other different scopes, real-time analysis of power-limiting capabilities such as total capacity, executable capacity, etc. is achieved from the perspectives of total capacity, dedicated lines, dedicated transformers and public lines.

[0078] (1) By region

[0079] The power-limiting capacity of the whole province and each region is counted in real time by region, and the statistical results include the provincial statistical results and the statistical results of each region.

[0080] The provincial statistical results include: the total capacity / executable total capacity of the province, the total capacity / executable total capacity of dedicated lines in the province, the total capacity / executable total capacity of dedicated transformers in the province, and the total capacity / executable total capacity of public lines in the province.

[0081] The regional statistical results include: regional total capacity / executable total capacity, regional dedicated line total capacity / executable total capacity, regional dedicated transformer total capacity / executable total capacity, regional public line total capacity / executable total capacity, regional plant and station total capacity / executable total capacity, regional plant and station dedicated line total capacity / executable total capacity, regional plant and station dedicated transformer total capacity / executable total capacity, and regional plant and station public line total capacity / executable total capacity.

[0082] (2) Statistics by rank

[0083] The power-limiting capacity of the whole province and each region is counted in real time according to the rank, and the statistical results include the provincial statistical results and the statistical results of each region.

[0084] The provincial statistical results include: the total capacity / executable capacity of power restriction due to accidents in the province, the total capacity / executable capacity of special power restriction lines for accidents in the province, the total capacity / executable capacity of special transformers for power restriction due to accidents in the province, the total capacity / executable capacity of public lines for power restriction due to accidents in the province, the total capacity / executable capacity of power restriction due to excess grid supply in the province, the total capacity / executable capacity of special power restriction lines for excess grid supply in the province, the total capacity / executable capacity of special transformers for power restriction due to excess grid supply in the province, the total capacity / executable capacity of public lines for power restriction due to excess grid supply in the province, the total capacity / executable capacity of power restriction in special sections in the province, the total capacity / executable capacity of special power restriction in special sections in the province, the total capacity / executable capacity of special transformers for power restriction in special sections in the province, and the total capacity / executable capacity of public lines for power restriction due to excess grid supply in the province.

[0085] The regional statistical results include: the total capacity of regional accident power restriction / total executable capacity, the total capacity of regional accident power restriction dedicated lines / total executable capacity, the total capacity of regional accident power restriction dedicated transformers / total executable capacity, the total capacity of regional accident power restriction public lines / total executable capacity, the total capacity of regional super-grid power restriction / total executable capacity, the total capacity of regional super-grid power restriction dedicated lines / total executable capacity, the total capacity of regional super-grid power restriction dedicated transformers / total executable capacity, the total capacity of regional super-grid power restriction public lines / total executable capacity, the total capacity of regional special section power restriction / total executable capacity, the total capacity of regional special section power restriction dedicated lines / total executable capacity, the total capacity of regional special section power restriction dedicated transformers / total executable capacity, and the total capacity of regional special section power restriction public lines / total executable capacity.

[0086] (3) Statistics by plant and station

[0087] The power-limiting capacity of the local dispatching is counted in real time by plant and station. The statistical results include 220kV plant and station statistics and power-limiting type statistics associated with 220kV plant and station.

[0088] Statistics based on 220kV power plants: total capacity of power plants / total executable capacity, total capacity of dedicated lines of power plants / total executable capacity, total capacity of dedicated transformers of power plants / total executable capacity, total capacity of public lines of power plants / total executable capacity.

[0089] Statistics by power restriction type associated with 220kV power plants: total capacity of power plants / executable total capacity due to accident power restriction, total capacity of dedicated lines / executable total capacity due to accident power restriction, total capacity of dedicated transformers / executable total capacity due to accident power restriction, and total capacity of public lines / executable total capacity due to accident power restriction. Total capacity / executable total capacity of power plants / power plants with excess grid supply, total capacity of dedicated lines / executable total capacity due to excess grid supply, total capacity of dedicated transformers / executable total capacity due to excess grid supply, and total capacity of public lines / executable total capacity due to excess grid supply. Total capacity / executable total capacity of power plants / power plants with special sections, total capacity of dedicated lines / executable total capacity due to special sections, total capacity of dedicated transformers / executable total capacity due to special sections, and total capacity of public lines / executable total capacity due to special sections.

[0090] (4) Statistics based on power restriction capacity according to the plan

[0091] Read the real-time library plan definition table and plan information table to obtain the relationship between the plants and stations in each region configured in the plan.

[0092] According to the regional plant-station association relationship configured in the plan, the power restriction capacity of the plan is counted. The statistical results include the total / executable capacity of the plan, the total / executable capacity of the dedicated line of the plan, the total / executable capacity of the dedicated transformer of the plan, the total / executable capacity of the public line of the plan, the total / executable capacity of each region in the plan configuration, the total / executable capacity of the dedicated line, the total / executable capacity of the dedicated transformer, and the total / executable capacity of the public line.

[0093] Secondly, accurate load shedding and distribution by classification and batch;

[0094] Initiate precise load shedding control from the interface, manually input the load shedding target, select the control plan (i.e. the participating units selected in advance), and allocate resources according to the latest statistical results of the resource pool. In principle, allocation is made according to the priority of dedicated line > dedicated transformer > public line. After the allocation result is formed, the allocation amount and the control range of the three types of resources will be issued as instructions.

[0095] Each task has an ID number (UNIX timestamp), and all interactive information after the task is created will carry this ID number.

[0096] After confirmation by the human-machine interface, the control command will be formed into an E file and sent to each local dispatch. After the provincial dispatch gives the command, the corresponding local dispatch's mark position will be unavailable until the local dispatch feedback line selection is completed. The provincial dispatch will release the mark after deducting the local dispatch line selection resources.

[0097] The monitoring screen will periodically scan the load shedding results and display the load shedding process information (such as the completed load shedding amount, the remaining amount, etc.) in real time. After the load shedding is completed in each place, the control process is terminated.

[0098] The dedicated line operation is mainly performed autonomously by local dispatching. The entire process is controlled in batches with loads. The selected switch is controlled by sending remote control commands through the human-machine interface until the load-pulling amount meets the provincial dispatching allocation or is terminated manually. Before the control instruction ends, the load-pulling progress (load-pulling amount, load-pulling object) is regularly uploaded in the form of an E-format file.

[0099] Dedicated line + dedicated transformer, execution requires joint participation of local dispatching and distribution network. The dedicated line part is controlled in batches with the same load. At this time, the dedicated line must be fully pulled. Therefore, after the local dispatching finishes pulling the line, the load pulling of the local dispatching part will be ended. After the distribution network pulling result is fed back, the residual amount (if any) will be sent to the distribution network again through the E file according to the local dispatching pulling situation (if the distribution network only pulls the line once). During the load shedding process, E files will be periodically generated and sent to the provincial dispatching (the distribution network pulling situation is sent by the progress file sent by the distribution network), and the results will be fed back to the provincial dispatching after the distribution network is completed.

[0100] Dedicated line + dedicated transformer + public line, the public line is the final resource control subject and is controlled by the local dispatch. If the provincial dispatch is in the control range, the local dispatch will still issue orders in the dedicated line + dedicated transformer mode first. After completion, the public line cutting amount will be recalculated and the public line cutting operation will be executed through the local dispatch. During the load cutting process, E files will be periodically generated and sent to the provincial dispatch (the distribution network loading situation is sent by the progress file sent by the distribution network). After all load cutting is completed, the provincial dispatch will be fed back the load cutting results.

[0101] The logic and control strategy for accurate load shedding distribution by classification and batching are as follows:

[0102] (1) The limited load is less than the total amount of “dedicated lines” that can be cut in each region

[0103] The load shedding amount ordered by the provincial dispatching agency is allocated to the "dedicated line" cuttable capacity of each region in proportion to the real-time electricity load of each region. If a region has no cuttable "dedicated line" capacity, the remaining "dedicated line" cuttable capacity of other regions will continue to be allocated in proportion to the real-time electricity load until a control sequence that meets the load control requirements is formed.

[0104] (2) The limited load is greater than the total amount that can be cut by the "dedicated line" in each region but less than the total amount that can be cut by the "dedicated line + dedicated transformer" in each region.

[0105] The load shedding ordered by the provincial dispatching department shall give priority to the total amount of "dedicated lines" that can be cut in each region, and the remaining load shedding shall be implemented by the cuttable capacity of "dedicated transformers" in each region, and distributed in proportion to the real-time power load in each region. If a region has no cuttable "dedicated transformer" capacity, the remaining "dedicated transformer" capacity in other regions shall continue to be distributed in proportion to the real-time power load until a control sequence that meets the load control requirements is formed.

[0106] (3) The limited load is greater than the total amount that can be cut by "dedicated line + dedicated transformer" in each region

[0107] The load shedding capacity issued by the provincial dispatching department shall be implemented first based on the total amount of "dedicated lines + dedicated transformers" that can be cut in each region, and the remaining load shedding shall be implemented by the cuttable capacity of the "public lines" in each region, and distributed in proportion to the real-time electricity load in each region. If a region has no cuttable "public line" capacity, the remaining "public line" capacity in other regions shall continue to be distributed in proportion to the real-time electricity load until a control sequence that meets the load control requirements is formed (the order of public line load shedding shall be executed in descending order of the impact on important loads such as people's livelihood).

[0108] The solution of this embodiment is further demonstrated through a specific example:

[0109] 1) The provincial dispatching and local coordinated control interface has the function of sending proportional allocation task messages to the proportional background allocation program. The task content includes the power restriction target capacity and the power restriction scope (region, 220kV substation, plan information), and the task is sent via the message bus.

[0110] 2) After receiving the allocation task, the background allocation program first verifies the feasibility of the proportional allocation task, and then allocates the power-limiting target amount. The allocation result includes the allocation amount of each power-limiting unit (region or 220 substation) and the allocation amount of each power-limiting resource (dedicated line, dedicated transformer, public line). If the task content specifies the plan information, the allocation result needs to include the allocation amount of each power-limiting unit (region or 220 substation) under the specified plan and the allocation amount information of each power-limiting resource (dedicated line, dedicated transformer, public line), and the allocation result is sent to the provincial and local collaborative control interface through the message bus.

[0111] 3) Allocation should be based on the strategy of first private lines, then private transformers, and finally public lines.

[0112] 4) When allocating according to the designated area, the allocation ratio is calculated based on the proportion of the real-time load value of each region maintained in the calculation point table; when allocating according to the designated 220kV substation, the allocation ratio is calculated based on the proportion of the total active added value on the high-voltage side of each plant and station maintained in the calculation point table; when allocating according to the designated plan, the allocation object is the area maintained in the plan, and the allocation ratio is calculated based on the proportion of the real-time load value of each region maintained in the calculation point table.

[0113] 5) When allocating load shedding, the provincial dispatching function determines whether it is available based on the available flag of the local dispatching and decides whether to participate in the load shedding allocation.

[0114] 6) Check in real time whether there is a control task being executed in the task queue, and read the pull status cyclically if there is a control task.

[0115] 7) If the dedicated line is not completed, update the progress and store it in the database. If the dedicated line is completed, check whether the distribution network has completed the load shedding. If the distribution network load shedding is completed or timed out, determine whether the current load shedding amount has reached the expected target. If it has not reached the target and the task can be pulled by the distribution network, generate the distribution network load pulling E file with the remaining load shedding amount and send it to the distribution network for execution.

[0116] 8) If the task requires the use of a public line, the remaining load shedding amount will be sent to everyone after the dedicated line and dedicated transformer are shelved, and the human-machine interface will perform the public line operation.

[0117] 9) When the load-pulling capacity reaches the expected target, or the distribution network has completed two load-shedding operations, the load-shedding result E file is generated and sent to the provincial dispatching department.

[0118] Example 3

[0119] This is the third embodiment of the present invention, which is different from the previous two embodiments in that it provides a power system land-saving coordinated load shedding control system, including a master control module, a data acquisition and analysis module, a priority assessment module, a reliability calculation module, a load distribution and monitoring module, a dynamic adjustment module and a load shedding sequence management module.

[0120] Among them, the master control module, through the coordinated work of provincial, local and dispatching control systems, realizes the effective management and load shedding control of key loads under various power supply modes; the data acquisition and analysis module divides the load shedding objects according to the power supply mode and collects and stores the historical data of each key load to provide a basis for subsequent evaluation; the priority assessment module builds a priority assessment model based on power supply reliability, quantifies risks and instability, and determines the priority of each load; the reliability calculation module counts the power outage time through the indicator function, calculates the power supply reliability of each load within the evaluation period, and supports priority evaluation; the load distribution and monitoring module formulates load shedding ratio rules and enhances the resource pool monitoring and allocation functions in the provincial and local dispatching systems to ensure accurate control of the load shedding process; the dynamic adjustment module sets the lower limit of the load shedding ratio to protect high-priority loads, and flexibly adjusts the load shedding ratio of low-priority loads according to real-time conditions, and regularly optimizes the rules to adapt to changes; the load shedding sequence management module performs load shedding operations in the order of dedicated lines, dedicated transformers, and public lines. If necessary, limited load shedding is implemented for some high-priority public line loads to ensure system stability.

[0121] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0122] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0123] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0124] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limited. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0125] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for controlling load shedding in a power system by using land-saving coordinated load shedding, characterized in that: include, Divide the load shedding objects according to the power supply mode, and obtain the historical data of each key load in each type of load shedding object; Taking power supply reliability as the evaluation standard, a priority evaluation model for each key load is constructed based on historical data to ensure that key loads with lower power supply reliability can be given higher priority in the load shedding strategy; The provincial dispatching control system allocates the load shedding tasks of various load shedding objects to the local dispatching and distribution control systems according to the priority of key loads and the real-time proportion of various load shedding objects.

2. The method for controlling load shedding in a power system according to claim 1, characterized in that: The step of constructing a priority evaluation model for each key load based on historical data includes the following steps: Determine the priority factor of each load as the evaluation index of the priority evaluation model; A standard deviation is introduced to adjust the sensitivity of the priority factor to the change of power supply reliability; By obtaining the power supply reliability, the integral of the power supply unreliability in the entire assessment period is calculated to quantify the risk and instability of the corresponding load in the assessment period.

3. The method for controlling load shedding in a power system according to claim 2, characterized in that: The obtaining of power supply reliability specifically includes the following steps: An indicator function is introduced to indicate whether each load has a power outage at any time point, and the sum of the power outage time of each load in the evaluation period is obtained; The power supply reliability of each load during the assessment period is calculated based on the total time of the assessment period and the sum of the power outage time of each load during the assessment period.

4. The method for controlling load shedding in a power system according to any one of claims 1 to 3, characterized in that: Also includes: Formulate load shedding ratio rules and control logic for various types of load shedding objects in different regions to regulate the load during the load shedding process; On the basis of the load batch control coordination function of the provincial dispatching system, the resource pool monitoring and statistics function, load shedding allocation function and control process monitoring function are added; The geological survey system adds resource pool monitoring, statistics and data allocation functions.

5. The power system land-saving coordinated load shedding control method according to claim 4, characterized in that: The load shedding ratio rules and control logic for various load shedding objects in various regions also include the following rules: If the priority weight of the load shedding object is high but the real-time proportion is low, set the lower limit of the load shedding proportion to ensure that the critical load is not over-shedded; If the priority weight of the load shedding object is low, the load shedding ratio will be appropriately increased according to the real-time proportion to balance the system load; In emergency situations, such as when the power grid is severely overloaded, priority weights are temporarily ignored and load shedding is performed directly based on real-time proportions to quickly reduce system load. The load shedding ratio rules should be evaluated and updated regularly to adapt to changes in the grid structure and load characteristics.

6. The method for controlling load shedding in a power system according to any one of claims 1 to 3 and 5, characterized in that: The load shedding objects specifically include dedicated power supply, dedicated transformer power supply and public power supply.

7. The method for controlling load shedding in a power system according to claim 6, characterized in that: All load shedding is carried out in the order of dedicated lines, dedicated transformers and public lines. The load shedding amount and type of the units participating in the load shedding are decided on the provincial dispatching side. When dedicated line resources are exhausted, dedicated transformers are pulled first, and public lines are allowed only after all are exhausted.

8. A system using the power system land-saving coordinated load shedding control method as claimed in any one of claims 1, 2, 3, 5 and 7, characterized in that: include, The master control module, through the coordinated work of provincial, local and distribution control systems, can achieve effective management and load shedding control of key loads under various power supply modes; The data collection and analysis module divides the load shedding objects according to the power supply mode and collects and stores the historical data of each key load to provide a basis for subsequent evaluation; Priority assessment module, which builds a priority assessment model based on power supply reliability, quantifies risks and instability, and determines the priority of each load; The reliability calculation module counts the power outage time through the indicator function, calculates the power supply reliability of each load within the evaluation period, and supports priority evaluation; Load distribution and monitoring module, formulates load shedding ratio rules and enhances resource pool monitoring and allocation functions in provincial and local dispatching systems to ensure accurate control of the load shedding process; Dynamic adjustment module, set the lower limit of load shedding ratio to protect high priority loads, and flexibly adjust the load shedding ratio of low priority loads according to real-time conditions, and regularly optimize the rules to adapt to changes; The load shedding sequence management module executes load shedding operations in the order of dedicated lines, dedicated transformers, and public lines. If necessary, limited load shedding is implemented on some high-priority public line loads to ensure system stability.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the power system land-saving coordinated load shedding control method described in any one of claims 1, 2, 3, 5 and 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the power system land-saving coordinated load shedding control method described in any one of claims 1, 2, 3, 5 and 7 are implemented.

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