Multi-region interconnected power grid load frequency control method and system

Abstract

The invention relates to the field of power system load frequency control, in particular to a multi-region interconnected power grid load frequency control method and system. The estimator corresponding to each area receives a k moment load frequency error sent by the power plant in the current area and a control instruction sent by the compensator, updates a pseudo partial derivative and sends the pseudo partial derivative to the trigger corresponding to the current area, and the trigger judges whether an event triggering condition is met or not; if yes, the updated pseudo partial derivative and the load frequency error at the moment k are sent to a controller corresponding to the current area, the controller sends an updated controller control instruction to a compensator corresponding to the current area through a power network, and the compensator compensates the updated controller control instruction through a power network delay compensation strategy. And sending to a power plant corresponding to the current area. According to the method, the load frequency of the power system can be controlled without a power system model, and the problems of limited power network communication resources and power network delay are solved.

Description

Technical Field

[0001] The present invention relates to the field of load frequency control of power systems, and in particular to a method and system for load frequency control of multi-region interconnected power grids. Background Art

[0002] In the power system, maintaining frequency stability is an important factor in ensuring the safe operation of the system. Instability in the power system will not only affect users' electricity consumption and damage system equipment, but may even lead to power grid collapse, causing large-scale power outages and huge losses to society. Load frequency control (LFC) is a key technology in the power system, used to maintain system frequency stability and ensure that inter-regional power exchange proceeds as planned. In a multi-region interconnected power system, the goal of load frequency control is to ensure that the power generation in each region matches the power consumption and maintain the frequency of the entire system within the allowable range. With the continuous expansion of the scale of the power system and the large-scale access of renewable energy such as wind and solar energy, load frequency control faces new challenges.

[0003] The power system is a complex power network composed of many different types of generators, loads and transmission lines. The structure of the power system is complex and is affected by many factors, making it difficult to establish an accurate mathematical model. In multi-regional interconnected power systems, information needs to be transmitted between different control centers through the communication power network, which will cause delays in signal transmission. In addition, the bandwidth and energy in actual communication power networks are limited. Frequent data transmission will increase communication costs and energy consumption. Therefore, when controlling the load frequency of multi-regional interconnected power systems, the limited communication resources should be considered, and the number of communications and energy consumption should be reduced. Therefore, developing a load frequency control method for multi-regional interconnected power systems that does not require a power system model and takes into account power network delays and limited communication resources has become an important research direction. Summary of the invention

[0004] To this end, the technical problem to be solved by the present invention is to overcome the technical problem in the prior art that it is difficult to know the accurate model of the power system in reality, and there are power network delays and limited communication resources, which makes load frequency control in various regions very difficult.

[0005] In order to solve the above technical problems, the present invention provides a method for controlling load frequency of a multi-region interconnected power grid, comprising the following steps: Step S1: Each region corresponding estimator receives the power plant in the current region The load frequency error at the moment is consistent with the control instruction sent by the compensator. The estimator updates the pseudo partial derivative and compares the updated pseudo partial derivative with The moment load frequency error is sent to the corresponding trigger in the current area through the power network; Step S2: The trigger is The updated pseudo partial derivatives and The load frequency error at the moment is based on The load frequency error at the moment and the dynamic event trigger function are used to determine whether the event trigger condition is met. If so, the updated pseudo partial derivative is combined with The load frequency error at the moment is sent to the corresponding controller of the current area, where: , The updated pseudo partial derivatives are combined with The delay time for the load frequency error at the moment to be sent to the corresponding trigger of the current area through the power network; Step S3: The controller receives the updated pseudo partial derivative and After the load frequency error is determined, the updated controller control instruction is sent to the corresponding compensator in the current area through the power network; Step S4: The compensator The updated controller control instructions are received at all times, the updated controller control instructions are compensated through the power network delay compensation strategy, and the compensated control instructions are sent to the corresponding power plant in the current area, where: , The delay time for the controller to send the updated controller control instruction to the corresponding compensator in the current area through the power network; Through steps S1-S4, the load frequency error of each region in the multi-region interconnected power system is controlled to be within a preset range centered on 0.

[0006] Preferably, the current region corresponding estimator receives the current region power plant sent The load frequency error at the moment and the control command sent by the compensator, the estimator updates the pseudo partial derivative, including: based on The load frequency error at the moment, the estimator updates the pseudo partial derivative; When the updated pseudo partial derivative meets the reset mechanism condition, the updated pseudo partial derivative is set equal to the initial value of the pseudo partial derivative of the current region; When the updated pseudo partial derivative does not satisfy the reset mechanism condition, the updated pseudo partial derivative remains unchanged.

[0007] Preferably, the power plant in the current area sends The load frequency error at the moment, the estimator updates the pseudo partial derivative, and the calculation formula is: ; in, For the Regions The moment corresponds to the updated pseudo partial derivative, For the Regions The moment corresponds to the updated pseudo partial derivative, For the The first set constant of the region is greater than 0 and less than or equal to 1, For the The second setting constant is greater than 0 in the area. Indicates the time, For the Regions The increment of load frequency error at time, , For the Regions The load frequency error at the moment, For the Regions The load frequency error at the moment, , For the Regions The increment of the control command sent by the moment compensator, For the Regions The control instructions sent by the time compensator, For the Regions The control instructions sent by the time compensator, , Indicates the total number of regions.

[0008] Preferably, the reset mechanism condition is: ; in, For the Regions The moment corresponds to the updated pseudo partial derivative, Indicates the time, is a third set constant greater than 0, , For the Regions The increment of the control command sent by the moment compensator, For the Regions The control instructions sent by the time compensator, For the Regions Time control instructions, , Indicates the total number of regions.

[0009] Preferably, the The load frequency error at the moment and the dynamic event trigger function are used to determine whether the event trigger condition is met. If not, the updated pseudo partial derivative and The load frequency error at each moment is adjusted to the controller corresponding to the current area.

[0010] Preferably, the dynamic event triggering function includes: Definition The set of times when the region meets the event triggering conditions is , express The number of times the event triggering conditions are met at a moment. , Indicates the number of times the event triggering condition is met; No. Regions The calculation formula of the dynamic event trigger function at the moment is: ; No. Regions Dynamic variables at the moment The calculation formula is: ; No. Regions The calculation formula of the event trigger error at time is: , ; in, For the Regions Dynamic event trigger function at the moment, For the Regions Dynamic variables at any time, For the Regions Dynamic variables at any time, For the Regions Time event trigger error, For the Regions Time event trigger error, , For the The target area control error setting value and The difference of load frequency error at each moment, For the The target area control error setting value and The difference of load frequency error at each moment, Indicates the target area control error setting value, For the Regions The load frequency error at the moment, Indicates The area in The corresponding time when the event triggering condition is met, For the The third setting constant is greater than 0 in the region, For the The fourth setting constant is greater than 0 in the area, For the The fifth setting constant of the area is greater than 0, and .

[0011] Preferably, the event triggering condition is: ; in, Indicates The area in The corresponding time when the event triggering condition is met, For the Regions Dynamic events trigger functions at certain moments.

[0012] Preferably, the controller receives the updated pseudo partial derivative and After the load frequency error is calculated, the updated controller control command is sent to the corresponding compensator in the current area through the power network. The calculation formula of the updated controller control command is: ; in, For the Regions Always correspond to the updated controller control instructions, For the Regions Always correspond to the updated controller control instructions, , For the Regions The moment corresponds to the updated pseudo partial derivative, Indicates the target area control error setting value, For the Regions The load frequency error at the moment, For the The sixth setting constant of the region is greater than 0 and less than or equal to 1, For the The seventh setting constant of the area is greater than 0, and .

[0013] Preferably, the compensator is The updated controller control instructions are received at all times, and the updated controller control instructions are compensated through the power network delay compensation strategy. The compensation formula is: ; in, For the Regions The time corresponds to the compensated control instruction. For the Regions The time corresponds to the compensated control instruction. , For the Regions The updated controller control instructions correspond to the The difference of the controller control instructions corresponding to the updated time, , For the Regions Always correspond to the updated controller control instructions, For the Regions Always correspond to the updated controller control instructions, , is a set constant, and , and They are and The upper bound of is the pseudo partial derivative, , is the total delay time, Indicates time.

[0014] The above technical solution of the present invention has the following beneficial effects compared with the prior art: The present invention discloses a method and system for controlling the load frequency of a multi-region interconnected power grid. Each region corresponding to an estimator receives the frequency information sent by the power plant in the current region. The load frequency error at the moment and the control instruction sent by the compensator update the pseudo partial derivative and send it to the corresponding trigger of the current area. The load frequency error at the moment and the dynamic event trigger function, the trigger determines whether the event trigger condition is met, if so, the updated pseudo partial derivative is combined with The load frequency error at the moment is sent to the corresponding controller of the current area. The controller sends the updated controller control instruction to the corresponding compensator of the current area through the power network. The compensator compensates the updated controller control instruction through the power network delay compensation strategy and sends it to the corresponding power plant of the current area. The present invention can realize the control of the load frequency of the power system without knowing the internal model information of the power system. By designing the dynamic event trigger function and the power network delay compensation strategy, the problems of limited power network communication resources and power network delay are solved respectively, the frequency fluctuation between regions is reduced, and the stability and reliability of the power system are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein: Figure 1 It is a structural diagram of a multi-region interconnected power grid load frequency control method and system of the present invention.

[0016] Figure 2 The present invention is a flowchart of the steps of a method for controlling the load frequency of a multi-region interconnected power grid.

[0017] Figure 3 The present invention discloses a method for controlling load frequency of a multi-region interconnected power grid and a schematic diagram of an interconnected power system consisting of three regions in the system.

[0018] Figure 4 The present invention discloses a method for controlling load frequency of a multi-region interconnected power grid and a schematic diagram of power network delay in an interconnected power system composed of three regions in the system.

[0019] Figure 5 The present invention is a method for controlling load frequency of a multi-region interconnected power grid and a schematic diagram of event triggering intervals under static load in the system.

[0020] Figure 6 The present invention discloses a method for controlling load frequency of a multi-region interconnected power grid and a load increment curve diagram under static load in the system.

[0021] Figure 7 The present invention is a method for controlling load frequency of a multi-region interconnected power grid and a schematic diagram of event triggering intervals under dynamic load in the system.

[0022] Figure 8 The present invention discloses a method for controlling load frequency of a multi-region interconnected power grid and a load increment curve diagram under dynamic load in the system. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0024] Reference Figure 1 , 2 As shown, the first embodiment of the present invention provides a method for controlling load frequency of a multi-region interconnected power grid, comprising the following steps: Step S1: Each region corresponding estimator receives the power plant in the current region The load frequency error at the moment is consistent with the control instruction sent by the compensator. The estimator updates the pseudo partial derivative and compares the updated pseudo partial derivative with The moment load frequency error is sent to the corresponding trigger in the current area through the power network; Among them, the current regional power plants The load frequency error at the moment is The difference between the actual load frequency and the target load frequency at a certain moment.

[0025] In this embodiment, preferably, the current region corresponding estimator receives the current region power plant sent The load frequency error at the moment and the control command sent by the compensator, the estimator updates the pseudo partial derivative, including: based on The load frequency error at the moment, the estimator updates the pseudo partial derivative; When the updated pseudo partial derivative meets the reset mechanism condition, the updated pseudo partial derivative is set equal to the initial value of the pseudo partial derivative of the current region; When the updated pseudo partial derivative does not satisfy the reset mechanism condition, the updated pseudo partial derivative remains unchanged.

[0026] The current regional power plants send The load frequency error at the moment, the estimator updates the pseudo partial derivative, and the calculation formula is: ; in, For the Regions The moment corresponds to the updated pseudo partial derivative, For the Regions The moment corresponds to the updated pseudo partial derivative, For the The first set constant of the region is greater than 0 and less than or equal to 1, For the The second setting constant is greater than 0 in the area. Indicates the time, For the Regions The increment of load frequency error at time, , For the Regions The load frequency error at the moment, For the Regions The load frequency error at the moment, , For the Regions The increment of the control command sent by the moment compensator, For the Regions The control instructions sent by the time compensator, For the Regions The control instructions sent by the time compensator, , Indicates the total number of regions.

[0027] The reset mechanism conditions are: ; in, For the Regions The moment corresponds to the updated pseudo partial derivative, Indicates the time, is a third set constant greater than 0, , For the Regions The increment of the control command sent by the moment compensator, For the Regions The control instructions sent by the time compensator, For the Regions Time control instructions, , Indicates the total number of regions.

[0028] Step S2: The trigger is The updated pseudo partial derivatives and The load frequency error at the moment is based on The load frequency error at the moment and the dynamic event trigger function are used to determine whether the event trigger condition is met. If so, the updated pseudo partial derivative is combined with The load frequency error at the moment is sent to the corresponding controller of the current area, where: , The updated pseudo partial derivatives are combined with The delay time for the load frequency error at the moment to be sent to the corresponding trigger of the current area through the power network; In this embodiment, preferably, the The load frequency error at the moment and the dynamic event trigger function are used to determine whether the event trigger condition is met. If not, the updated pseudo partial derivative and The load frequency error at each moment is adjusted to the controller corresponding to the current area.

[0029] In this embodiment, preferably, the dynamic event triggering function includes: Definition The set of times when the region meets the event triggering conditions is , express The number of times the event triggering conditions are met at a moment. , Indicates the number of times the event triggering condition is met; No. Regions The calculation formula of the dynamic event trigger function at the moment is: ; No. Regions Dynamic variables at the moment The calculation formula is: ; No. Regions The calculation formula of the event trigger error at time is: , ; in, For the Regions Dynamic event trigger function at the moment, For the Regions Dynamic variables at any time, For the Regions Dynamic variables at any time, For the Regions Time event trigger error, For the Regions Time event trigger error, , For the The target area control error setting value and The difference of load frequency error at each moment, For the The target area control error setting value and The difference of load frequency error at each moment, Indicates the target area control error setting value, For the Regions The load frequency error at the moment, Indicates The area in The corresponding time when the event triggering condition is met, For the The third setting constant is greater than 0 in the region, For the The fourth setting constant is greater than 0 in the area, For the The fifth setting constant of the area is greater than 0, and .

[0030] The event triggering conditions are: ; in, Indicates The area in The corresponding time when the event triggering condition is met, For the Regions Dynamic events trigger functions at certain moments.

[0031] By setting event trigger conditions, the event trigger mechanism allows the system to transmit data under specific conditions, so that the controller does not have to update control instructions in real time, thereby reducing the transmission of redundant data. Frequent real-time communication and data transmission consume a lot of electricity. Through the event trigger mechanism, the controller only updates instructions when necessary, thereby reducing the number of communications and energy consumption, and improving the overall efficiency of load frequency control.

[0032] Step S3: The controller receives the updated pseudo partial derivative and After the load frequency error is determined, the updated controller control instruction is sent to the corresponding compensator in the current area through the power network; The calculation formula of the updated controller control instruction is: ; in, For the Regions Always correspond to the updated controller control instructions, For the Regions Always correspond to the updated controller control instructions, , For the Regions The moment corresponds to the updated pseudo partial derivative, Indicates the target area control error setting value, For the Regions The load frequency error at the moment, For the The sixth setting constant of the region is greater than 0 and less than or equal to 1, For the The seventh setting constant of the area is greater than 0, and .

[0033] Step S4: The compensator The updated controller control instructions are received at all times, the updated controller control instructions are compensated through the power network delay compensation strategy, and the compensated control instructions are sent to the corresponding power plant in the current area, where: , The delay time for the controller to send the updated controller control instruction to the corresponding compensator in the current area through the power network; The compensator The updated controller control instructions are received at all times, and the updated controller control instructions are compensated through the power network delay compensation strategy. The compensation formula is: ; in, For the Regions The time corresponds to the compensated control instruction. For the Regions The time corresponds to the compensated control instruction. , For the Regions The updated controller control instructions correspond to the The difference of the controller control instructions corresponding to the updated time, , For the Regions Always correspond to the updated controller control instructions, For the Regions Always correspond to the updated controller control instructions, , is a set constant, and , and They are and The upper bound of is the pseudo partial derivative, , is the total delay time, Indicates time.

[0034] Through steps S1-S4, the load frequency error of each region in the multi-region interconnected power system is controlled to be within a preset range centered on 0.

[0035] Taking into account the impact of power network delay, a power network delay compensation strategy is designed to compensate for the control instructions sent by the updated compensator. Power network delay will cause a time difference between the control instructions and the actual situation. Through delay compensation, the control instructions can be adjusted to make up for this time difference, thereby improving the system's control accuracy over the target state.

[0036] like Figure 3 , 4 As shown, Figure 3 The schematic diagram of the interconnected power system consisting of three regions is shown in Figure 1. Figure 4 Schematic diagram of power network delay in the interconnected power system consisting of three regions.

[0037] Embodiment 2 of the present invention builds an interconnected power system consisting of three regions, and uses a multi-region interconnected power grid load frequency control method of the present invention to control the load frequency of static loads and dynamic loads respectively.

[0038] The interconnected power system consisting of three regions has a power system model as follows: , The main parameters of the power system model are designed as follows: , , , , , , , , , , , , , , , , , , , .

[0039] in, For Region With area The synchronous torque coefficient between is the unit damping coefficient of the generator, is the generator moment of inertia, is the generator speed reduction coefficient, is the speed regulator time constant, is the turbine time constant, is the frequency offset factor.

[0040] The main parameters of the controller are set as follows: , , , , , , , , , , .

[0041] Set the target area control error to , and apply to each area after 10s Static load. Figure 5 As shown, Figure 5 The diagram of event trigger interval under static load shows the instant of event triggering and the corresponding trigger interval, where the height of each point represents the time difference between the current triggering instant and the last triggering instant. In 12,000 times, each area was triggered 1,320 times, 979 times, and 1,270 times, respectively, saving 89.00%, 91.84%, and 89.41% of energy. Figure 6 As shown, Figure 6 is the load increment curve under static load, according to Figure 6 It can be seen that the system load frequency increment curve is Time convergence.

[0042] Set the target area control error to . Apply after 5s The multi-region interconnected power grid load frequency control method proposed in the present invention is still effective for dynamic loads. Figure 7 As shown, Figure 7 The diagram of event trigger interval under dynamic load shows the instant of event triggering and the corresponding trigger interval, where the height of each point represents the time difference between the current triggering instant and the previous triggering instant. In 12,000 times, each area was triggered 4214 times, 3036 times, and 4413 times, respectively, saving 64.88%, 74.70%, and 63.23% of energy. Figure 8 As shown, Figure 8 The load increment curve under dynamic load shows the load frequency increment fluctuation curve.

[0043] It can be seen from the above-mentioned load frequency control of static loads and dynamic loads that the load frequency control method of the multi-region interconnected power system provided by the present invention is effective for both static loads and dynamic loads, and can reduce a large amount of energy consumption.

[0044] This embodiment three also provides a multi-region interconnected power grid load frequency control system, including: an estimator, a trigger, a controller and a compensator corresponding to each regional power plant in the multi-region interconnected power system; The estimator receives the current regional power plants' The load frequency error at the moment is compared with the control instruction sent by the compensator to update the pseudo partial derivative, and the updated pseudo partial derivative is compared with The moment load frequency error is sent to the corresponding trigger in the current area through the power network; Trigger, in The updated pseudo partial derivatives and The load frequency error at the moment is based on The load frequency error at the moment and the dynamic event trigger function are used to determine whether the event trigger condition is met. If so, the updated pseudo partial derivative is combined with The load frequency error at the moment is sent to the corresponding controller of the current area, where: , The updated pseudo partial derivatives are combined with The delay time for the load frequency error at the moment to be sent to the corresponding trigger of the current area through the power network; The controller receives the updated pseudo-partial derivatives and The load frequency error at the moment, the updated controller control command is sent to the corresponding compensator in the current area through the power network; Compensator, in The updated controller control instructions are received at all times, the updated controller control instructions are compensated through the power network delay compensation strategy, and the compensated control instructions are sent to the corresponding power plant in the current area, where: , It is the delay time for the controller to send the updated controller control instruction to the corresponding compensator in the current area through the power network.

[0045] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0046] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0047] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0048] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A method for controlling load frequency of a multi-region interconnected power grid, characterized in that: The following steps are involved: Step S1: Each region corresponding estimator receives the power plant in the current region The load frequency error at the moment is consistent with the control instruction sent by the compensator. The estimator updates the pseudo partial derivative and compares the updated pseudo partial derivative with The moment load frequency error is sent to the corresponding trigger in the current area through the power network; Step S2: The trigger is The updated pseudo partial derivatives and The load frequency error at the moment is based on The load frequency error at the moment and the dynamic event trigger function are used to determine whether the event trigger condition is met. If so, the updated pseudo partial derivative is combined with The load frequency error at the moment is sent to the corresponding controller of the current area, where: , The updated pseudo partial derivatives are combined with The delay time for the load frequency error at the moment to be sent to the corresponding trigger of the current area through the power network; Step S3: The controller receives the updated pseudo partial derivative and After the load frequency error is determined, the updated controller control command is sent to the corresponding compensator in the current area through the power network; Step S4: The compensator The updated controller control instructions are received at all times, the updated controller control instructions are compensated through the power network delay compensation strategy, and the compensated control instructions are sent to the corresponding power plant in the current area, where: , The delay time for the controller to send the updated controller control instruction to the corresponding compensator in the current area through the power network; Through steps S1-S4, the load frequency error of each region in the multi-region interconnected power system is controlled to be within a preset range centered on 0.

2. A method for controlling load frequency of a multi-regional interconnected power grid according to claim 1, characterized in that: The current region corresponding estimator receives the current region power plant sent The load frequency error at the moment and the control command sent by the compensator, the estimator updates the pseudo partial derivative, including: based on The load frequency error at the moment, the estimator updates the pseudo partial derivative; When the updated pseudo partial derivative meets the reset mechanism condition, the updated pseudo partial derivative is set equal to the initial value of the pseudo partial derivative of the current region; When the updated pseudo partial derivative does not satisfy the reset mechanism condition, the updated pseudo partial derivative remains unchanged.

3. A method for controlling load frequency of a multi-regional interconnected power grid according to claim 2, characterized in that: The current regional power plants send The load frequency error at the moment, the estimator updates the pseudo partial derivative, and the calculation formula is: ; in, For the Regions The moment corresponds to the updated pseudo partial derivative, For the Regions The moment corresponds to the updated pseudo partial derivative, For the The first set constant of the region is greater than 0 and less than or equal to 1, For the The second setting constant is greater than 0 in the area. Indicates the time, For the Regions The increment of load frequency error at time, , For the Regions The load frequency error at the moment, For the Regions The load frequency error at the moment, , For the Regions The increment of the control command sent by the moment compensator, For the Regions The control instructions sent by the time compensator, For the Regions The control instructions sent by the time compensator, , Indicates the total number of regions.

4. A method for controlling load frequency of a multi-regional interconnected power grid according to claim 2, characterized in that: The reset mechanism conditions are: ； in, For the Regions The moment corresponds to the updated pseudo partial derivative, Indicates the time, is a third set constant greater than 0, , For the Regions The increment of the control command sent by the moment compensator, For the Regions The control instructions sent by the time compensator, For the Regions Time control instructions, , Indicates the total number of regions.

5. The method for controlling load frequency of a multi-regional interconnected power grid according to claim 1, characterized in that: The basis The load frequency error at the moment and the dynamic event trigger function are used to determine whether the event trigger condition is met. If not, the updated pseudo partial derivative and The load frequency error at each moment is adjusted to the controller corresponding to the current area.

6. A method for controlling load frequency of a multi-region interconnected power grid according to claim 1, characterized in that: The dynamic event triggering function includes: Definition The set of times when the region meets the event triggering conditions is , express The number of times the event triggering conditions are met at a moment. , Indicates the number of times the event triggering condition is met; No. Regions The calculation formula of the dynamic event trigger function at the moment is: ； No. Regions Dynamic variables at the moment The calculation formula is: ； No. Regions The calculation formula of the event trigger error at time is: ， ； in, For the Regions Dynamic event trigger function at the moment, For the Regions Dynamic variables at any time, For the Regions Dynamic variables at any time, For the Regions Time event trigger error, For the Regions Time event trigger error, , For the The target area control error setting value and The difference of load frequency error at each moment, For the The target area control error setting value and The difference of load frequency error at each moment, Indicates the target area control error setting value, For the Regions The load frequency error at the moment, Indicates The area in The corresponding time when the event triggering condition is met, For the The third setting constant is greater than 0 in the region, For the The fourth setting constant is greater than 0 in the area, For the The fifth setting constant of the area is greater than 0, and .

7. A method for controlling load frequency of a multi-regional interconnected power grid according to claim 6, characterized in that: The event triggering conditions are: ； in, Indicates The area in The corresponding time when the event triggering condition is met, For the Regions Dynamic events trigger functions at certain moments.

8. A method for controlling load frequency of a multi-region interconnected power grid according to claim 1, characterized in that: The controller receives the updated pseudo partial derivative and After the load frequency error is calculated, the updated controller control command is sent to the corresponding compensator in the current area through the power network. The calculation formula of the updated controller control command is: ； in, For the Regions Always correspond to the updated controller control instructions, For the Regions Always correspond to the updated controller control instructions, , For the Regions The moment corresponds to the updated pseudo partial derivative, Indicates the target area control error setting value, For the Regions The load frequency error at the moment, For the The sixth setting constant of the region is greater than 0 and less than or equal to 1, For the The seventh setting constant of the area is greater than 0, and .

9. A method for controlling load frequency of a multi-regional interconnected power grid according to claim 1, characterized in that: The compensator The updated controller control instructions are received at all times, and the updated controller control instructions are compensated through the power network delay compensation strategy. The compensation formula is: ； in, For the Regions The time corresponds to the compensated control instruction. For the Regions The time corresponds to the compensated control instruction. , For the Regions The updated controller control instructions correspond to the The difference of the controller control instructions corresponding to the updated time, , For the Regions Always correspond to the updated controller control instructions, For the Regions Always correspond to the updated controller control instructions, , is a set constant, and , and They are and The upper bound of is the pseudo partial derivative, , is the total delay time, Indicates time.

10. A multi-region interconnected power grid load frequency control system, characterized in that: include: Estimators, triggers, controllers and compensators corresponding to each regional power plant in a multi-regional interconnected power system; The estimator receives the current regional power plants' The load frequency error at the moment is compared with the control instruction sent by the compensator to update the pseudo partial derivative, and the updated pseudo partial derivative is compared with The moment load frequency error is sent to the corresponding trigger in the current area through the power network; Trigger, in The updated pseudo partial derivatives and The load frequency error at the moment is based on The load frequency error at the moment and the dynamic event trigger function are used to determine whether the event trigger condition is met. If so, the updated pseudo partial derivative is combined with The load frequency error at the moment is sent to the corresponding controller of the current area, where: , The estimator combines the updated pseudo partial derivatives with The delay time for the load frequency error at the moment to be sent to the corresponding trigger of the current area through the power network; The controller receives the updated pseudo-partial derivatives and The load frequency error at the moment, the updated controller control command is sent to the corresponding compensator in the current area through the power network; Compensator, in The updated controller control instructions are received at all times, the updated controller control instructions are compensated through the power network delay compensation strategy, and the compensated control instructions are sent to the corresponding power plant in the current area, where: , It is the delay time for the controller to send the updated controller control instruction to the corresponding compensator in the current area through the power network.

Images