A power low-frequency load reduction system

Abstract

The present invention relates to an electric power low-frequency load reduction system in the field of electric power systems, comprising a terminal system and multiple partition systems. The terminal system comprises: data processing, low-frequency load reduction, monitoring, data storage, user management, and data transmission modules. The data processing module calculates the total load shedding amount, selects a load reduction strategy, and processes and restores the load. The low-frequency load reduction module identifies the line and executes the load reduction strategy. The monitoring module monitors the grid frequency and user-end load information. The data storage module stores historical data, user information, and plans. The user management module manages user priority. The data transmission module transmits partition system monitoring data. The partition system comprises load regulation and information collection modules. The load regulation executes load reduction and recovery instructions and calls a load reduction device to reduce the load. The information collection module collects user-end monitoring data and is connected to a smart meter to realize the combination of low-frequency load reduction and smart partition power management technology, thereby realizing accurate monitoring and rapid response of the grid frequency.

Description

Technical Field

[0001] The present invention relates to an electric power low-frequency load shedding system, and in particular to an electric power low-frequency load shedding system applied in the field of electric power systems. Background Art

[0002] The power underfrequency load shedding system is a protective measure used to maintain power system stability. Its primary purpose is to automatically remove non-critical loads when the power system frequency drops below a certain level, preventing further drops in frequency and potentially large-scale power outages and equipment damage. Underfrequency load shedding plays a crucial role in power systems, particularly when there is an imbalance between power generation and load.

[0003] In order to solve the problem of low-frequency load reduction system of electric power, a low-frequency load reduction system in the market adopts the design of low-frequency relay, which has a certain market share.

[0004] The specification of Chinese invention patent CN106684891B discloses a method and system for high-frequency power shedding in an electric power system. The method includes calculating an upper limit for the amount of power shedding that can be performed in each round of high-frequency power shedding in the electric power system, and determining the amount of power shedding in each round based on the upper limit. Compared with the prior art, the method and system for high-frequency power shedding provided by the present invention can prevent excessive frequency drops in the power system due to excessive power shedding, which could lead to malfunction of the power system's low-frequency load shedding device and cause load loss.

[0005] The existing power low-frequency load reduction system mostly performs batch recovery when the load is restored after load reduction. When a large number of loads are restored quickly, the system may experience power shortage again because the power generation capacity fails to keep up in time, causing the system frequency to drop again. In addition, the existing power low-frequency load reduction system is not easy to effectively manage load recovery according to the importance of different users when the load is complexly restored after load reduction. When the idle load is insufficient, it is not easy to give priority to the load recovery of important users. Summary of the Invention

[0006] In response to the above-mentioned existing technologies, the technical problem to be solved by the present invention is that when the existing power low-frequency load reduction system recovers the load after load reduction, it is mostly restored in batches. When a large number of loads are restored quickly, the system may have a power shortage again because the power generation capacity fails to keep up in time, causing the system frequency to drop again. In addition, when the existing power low-frequency load reduction system recovers in a complex manner after load reduction, it is not easy to effectively manage the load recovery according to the importance of different users. When the idle load is insufficient, it is not easy to give priority to the load recovery of important users.

[0007] To solve the above problems, the present invention provides a power under-frequency load reduction system, comprising a terminal system and multiple partition systems, wherein multiple user terminals are provided in the partition system, and the terminal system comprises:

[0008] The data processing module is used to calculate the total load shedding capacity based on the collected data, select the load shedding strategy based on the total load shedding capacity, and process the load restoration request;

[0009] The low-frequency load shedding module identifies the line properties and executes the preset load shedding strategy; the load shedding strategy includes regional priority load shedding strategy and user priority load shedding strategy;

[0010] The monitoring module is used to monitor the grid frequency and the load information of each user end. The load information includes: real-time load status, load shedding after action, and idle load;

[0011] Data storage module, used to store historical monitoring data, user information and load shedding strategy plan information;

[0012] The user management module is used to manage user priorities. Users are divided into different priority users from low to high;

[0013] The data transmission module is used to transmit the monitoring data of each partition system to the terminal system. The monitoring data includes user requests and instruction transmission. The data transmission module is provided with a request channel and a data transmission channel.

[0014] The partitioning system includes:

[0015] The load regulation module is used to execute load shedding instructions and load recovery instructions. The load regulation module is connected to a load shedding device. When the load regulation module executes the load shedding instruction, the load shedding device is called to sequentially reduce the load of each device group at the user end.

[0016] The information collection module is used to collect monitoring data of each user terminal in the partition, and the information collection module is connected to a smart meter.

[0017] In the above-mentioned power low-frequency load reduction system, low-frequency load reduction and intelligent zoning power management technology are combined to achieve accurate monitoring and rapid response of the power grid frequency.

[0018] As a further improvement of the present application, the request channel includes a priority channel and a normal channel;

[0019] The priority channel sorts requests according to user priority. The normal channel includes the sequential channel and the leaky bucket channel. The request channel sets the admission level of different channels according to the recovery load strategy.

[0020] As a further improvement of the present application, when the user end sends a user load recovery request, it sends device group recovery requests in sequence, and sends a new request after the previous device group is recovered.

[0021] As a further improvement of the present application, after the user terminal sends a load recovery request, the information collection module counts the total recovery load demand of users at all levels and sends it to the terminal system. The data processing module chooses to open a priority channel or a normal channel based on the total recovery load demand of users at all levels.

[0022] As another improvement of the present application, a region division module is provided in the system terminal, and the region division module is used to divide the priority of each partition.

[0023] As another improved supplement to the present application, the regional priority load reduction strategy specifically includes: selecting the load reduction area according to the required load reduction amount, and giving priority to low-priority areas for load reduction; after selecting the load reduction area, selecting the user end in turn according to the user priority in the area to cut load.

[0024] As another improved supplement of the present application, the user priority load shedding strategy specifically includes: grouping and sorting users of different priorities in each partition; when shedding load, selecting user terminals in each priority group in turn for load shedding.

[0025] As another improvement of the present application, when executing the load shedding strategy, when selecting load shedding for multiple user terminals of the same priority, a suitable optimal user terminal is selected for load shedding according to a load optimal shedding algorithm.

[0026] To summarize, this solution implements zoning and hierarchical load shedding modes, and supports flexible zoning and hierarchical load shedding modes. When load shedding needs to occur, the system first analyzes the zoning situation and divides the power grid into several management areas. In the zoning load shedding mode, priority is given to the partitions that perform non-essential tasks for unified management, and the load is gradually reduced according to the user classification strategy. The hierarchical load shedding is further refined to the equipment level to ensure that the load shedding operation is more accurate, and accurate monitoring and rapid response of the power grid frequency are achieved. Through the zoning and hierarchical load shedding strategy, the accuracy, flexibility and safety of the operation during load shedding and load restoration are effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a system block diagram of the first and second implementation modes of this application;

[0028] Figure 2 This is the load shedding logic diagram for the first and second implementation modes of this application;

[0029] Figure 3 This is the logic diagram for executing the load shedding strategy in the first and second implementation modes of this application;

[0030] Figure 4 This is a schematic diagram of the load recovery steps in the second embodiment of the present application. DETAILED DESCRIPTION

[0031] The following describes two implementation methods of the present application in detail with reference to the accompanying drawings.

[0032] The first implementation method:

[0033] Figure 1-3 FIG. 1 shows an electric power underfrequency load reduction system, comprising a terminal system and multiple partition systems, wherein multiple user terminals are provided in the partition system, and the terminal system comprises:

[0034] The data processing module is used to calculate the total load shedding capacity based on the collected data, select the load shedding strategy based on the total load shedding capacity, and process the load restoration request;

[0035] The low-frequency load shedding module identifies the nature of the line and executes the preset load shedding strategy; the load shedding strategy includes the regional priority load shedding strategy and the user priority load shedding strategy; the user priority load shedding strategy specifically includes: grouping and sorting users of different priorities in each partition; when shedding load, the user terminals in each priority group are selected in turn for load shedding.

[0036] The monitoring module is used to monitor the grid frequency and the load information of each user end. The load information includes: real-time load status, load shedding after action, and idle load;

[0037] Data storage module, used to store historical monitoring data, user information and load shedding strategy plan information;

[0038] The user management module is used to manage user priorities. Users are divided into different priority users from low to high.

[0039] This terminal system uses a high-precision detection module to monitor the grid frequency in real time. Once the frequency falls below a preset threshold and persists for a set duration, the system automatically initiates load shedding. Using pre-set algorithms and models, the system calculates the required load shedding based on the degree and speed of the frequency drop, and then implements the load shedding strategy according to the pre-set load shedding strategy.

[0040] The data transmission module is used to transmit the monitoring data of each partition system to the terminal system. The monitoring data includes user requests and instruction transmission. The data transmission module is provided with a request channel and a data transmission channel.

[0041] Request channels include priority channels and common channels. Priority channels sort requests based on user priority, common channels include sequential channels and leaky bucket channels, and request channels set the admission levels of different channels based on the recovery load strategy.

[0042] The partitioning system includes:

[0043] The load regulation module is used to execute load shedding instructions and load recovery instructions. The load regulation module is connected to a load shedding device. When the load regulation module executes the load shedding instruction, the load shedding device is called to sequentially reduce the load of each device group at the user end.

[0044] The information collection module is used to collect monitoring data of each user terminal in the partition, and the information collection module is connected to a smart meter.

[0045] When the user sends a user load recovery request, it sends device group recovery requests in sequence, and sends a new request after the previous device group is restored;

[0046] After the user sends a load recovery request, the information collection module counts the total load recovery demand of users at all levels and sends it to the terminal system. The data processing module chooses to open a priority channel or a normal channel based on the total load recovery demand of users at all levels.

[0047] When the system is working, the detection module monitors the grid frequency. When the frequency is lower than the set value and lasts for more than the set time, the load reduction amount is calculated and the load reduction is carried out according to the preset load reduction strategy. Specifically, based on the degree and speed of the grid frequency drop, the low-frequency load reduction device calculates the load amount to be removed. It is implemented by those skilled in the art using appropriate algorithms and models in the existing technology.

[0048] In this embodiment, when reducing the load, the low-frequency load reduction module executes the user priority load reduction strategy and sends a load reduction instruction to the load regulation module. When the partition power management module reduces the load, it reduces the load of the device groups on the corresponding user end in turn according to the partition user priority. After all the load-reducible device groups on a user end are reduced, the load is reduced on the next user end until the grid frequency returns to the normal range.

[0049] Furthermore, during load shedding, when selecting multiple user terminals of the same priority for load shedding, an appropriate optimal user terminal is selected for load shedding according to the load optimization shedding algorithm. The optimal shedding algorithm in this solution is a prior art and does not fall within the scope of protection of this solution. A person skilled in the art shall configure an appropriate optimal shedding algorithm in the prior art and load it into the system to ensure that the system can select the optimal user terminal for load shedding from multiple user terminals during load shedding.

[0050] After the grid frequency is restored, the idle load is monitored and the request channel is opened; the users whose load is reduced send a request for the equipment group to restore the load according to their needs;

[0051] After the user sends a load recovery request, the information collection module counts the total load recovery demand of users at all levels and sends it to the terminal system. The data processing module chooses to open a priority channel or a normal channel based on the total load recovery demand of users at all levels.

[0052] Specifically, the data processing module calculates whether the real-time idle load can meet the total recovery load requirements of users at all levels. If so, all request channels are opened. If not, only the priority channels are opened to process requests. The module then calculates how many levels of users' total recovery load requirements can be met by the idle load, sets the corresponding access level for the priority channels, and ensures that the priority channels only transmit requests from users with a priority level higher than the set one.

[0053] During the load recovery process, after the user request transmitted by the request channel is processed by the data processing module, a load recovery instruction is sent, causing the load control module to execute the load recovery instruction and restore the load to the corresponding user. During each recovery process, various system parameters such as voltage, current, power factor, and frequency are continuously monitored to ensure that these parameters fluctuate within a safe range to determine whether the system is stable.

[0054] If the parameters are abnormal, the load recovery will be stopped and the recovered load will be reduced. At the same time, the user will be marked and the request will be recorded before processing the next user request.

[0055] When the number of recorded requests exceeds the set number, the request channel is closed, the system alarms, and the preset technicians are notified to check the master control system and marked users.

[0056] Second implementation method

[0057] Figure 3-4 , wherein the components identical or corresponding to those in the first embodiment are designated by the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first embodiment in that:

[0058] The system terminal is provided with a region division module, which is used to divide the priority of each partition.

[0059] The regional priority load reduction strategy specifically includes: selecting the load reduction area according to the required load reduction amount, and giving priority to low-priority areas for load reduction; after selecting the load reduction area, the user end is selected in turn according to the user priority in the area to cut the load.

[0060] This solution can implement load shedding by zoning. When load shedding is needed, it is grouped according to the analyzed zoning situation. When using the regional priority load shedding strategy, each zone of the same level is selected in turn and load shedding is performed uniformly. When load shedding, the load is shelved for the load-shedding devices of each user class in turn according to the user class.

[0061] Optionally, when shedding load, for multiple user terminals of the same priority, a suitable optimal user terminal is selected for load shedding according to the load optimization shedding algorithm; after all the load-shedding device groups on a user terminal are shed, another user terminal is selected for load shedding until the grid frequency returns to a normal range;

[0062] This implementation method implements a hierarchical load reduction strategy within the partition. Based on the priority setting of the partition users, low-priority users are prioritized for load reduction to ensure that critical loads are not affected. At the same time, the load reduction operation within the partition follows the principle of selecting the optimal load reduction users in sequence to avoid grid fluctuations caused by concentrated load reduction.

[0063] In summary, this solution implements partitioned and layered load shedding modes, and supports flexible partitioned and layered load shedding modes. When load shedding needs to occur, the system first analyzes the partition situation and divides the power grid into several management areas. In the partitioned load shedding mode, the partitions that perform non-essential tasks are given priority for unified management, and the load is gradually reduced according to the user classification strategy. Layered load shedding is further refined to the equipment level to ensure more accurate load shedding operations.

[0064] This solution combines low-frequency load shedding with intelligent zoning power management technology to achieve accurate monitoring and rapid response of grid frequency. Through zoning and graded load shedding strategies, it effectively improves the accuracy, flexibility and safety of load shedding and restoration operations.

[0065] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A power under-frequency load reduction system, comprising a terminal system and multiple partition systems, wherein the partition systems are provided with multiple user terminals, characterized in that: The terminal system includes: The data processing module is used to calculate the total load shedding capacity based on the collected data, select the load shedding strategy based on the total load shedding capacity, and process the load restoration request; The low-frequency load shedding module identifies the line properties and executes a preset load shedding strategy; the load shedding strategy includes a regional priority load shedding strategy and a user priority load shedding strategy; A monitoring module is used to monitor the grid frequency and the load information of each user end, wherein the load information includes: real-time load status, load shedding amount after action, and idle load amount; Data storage module, used to store historical monitoring data, user information and load shedding strategy plan information; The user management module is used to manage user priorities. Users are divided into different priority users from low to high; The partitioning system includes: A data transmission module is used to transmit the monitoring data of each partition system to the terminal system, wherein the monitoring data includes user requests and instruction transmissions. The data transmission module is provided with a request channel and a data transmission channel; A load regulation module is configured to execute load shedding instructions and load recovery instructions. The load regulation module is connected to a load shedding device. When the load regulation module executes the load shedding instruction, the load shedding device is called to sequentially reduce the load on each device group at the user end. An information collection module is used to collect monitoring data of each user terminal in the partition, and the information collection module is connected to a smart meter; The regional priority load shedding strategy specifically includes: selecting a load shedding area based on the required load shedding amount, giving priority to low-priority areas for load shedding; after selecting the load shedding area, selecting user terminals in the area according to the user priority level for load shedding in sequence; The user priority load shedding strategy specifically includes: grouping and sorting users of different priorities in each partition; when shedding load, selecting user terminals in each priority group in turn for load shedding; When executing the load shedding strategy, for multiple user terminals of the same priority, a suitable optimal user terminal is selected for load shedding according to the load optimal shedding algorithm; When the load control module executes the load recovery instruction, it continuously monitors various parameters of the system. If the parameters are abnormal, the load recovery is stopped and the recovered load is reduced. At the same time, the user is marked and the request is recorded. The data processing module then processes the next user request. When the recorded requests are greater than the set number, the request channel is closed and the system alarm is issued.

2. The power under-frequency load reduction system according to claim 1, characterized in that: The request channel includes a priority channel and a normal channel; The priority channel sorts requests according to user priority, the common channel includes a sequential channel and a leaky bucket channel, and the request channel sets the admission level of different channels according to the recovery load strategy.

3. The power under-frequency load reduction system according to claim 1, characterized in that: When the user terminal sends a user load recovery request, it sends the load recovery request to the device group whose load is reduced from the back to the front according to the order in which the device group is reduced. After the previous device group recovers the load, it sends a new load recovery request, so that multiple user terminals are uniformly batched.

4. The power under-frequency load reduction system according to claim 1, characterized in that: After the user terminal sends a load recovery request, the information collection module counts the total recovery load demand of users at all levels and sends it to the terminal system. The data processing module chooses to open a priority channel or a normal channel based on the total recovery load demand of users at all levels.

5. The power under-frequency load reduction system according to claim 1, characterized in that: The terminal system is provided with a region division module, and the region division module is used to divide the priority of each partition.

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