A method and system for coordinated control of phase shifters and VSC devices

Abstract

The application discloses a kind of methods and systems for the coordinated control of phase shifter and VSC equipment, belong to power grid control technical field.The application is proposed, comprising: determining the future preset period, the power flow change curve of power grid key line;Based on the power flow change curve, determine the power adjustment amount of each time point hybrid power flow controller in the future preset period;Based on the power adjustment amount, the objective function for coordinating control is established for the phase shifter and VSC equipment inside hybrid power flow controller;The optimal solution of objective function is obtained using a predetermined algorithm, based on the optimal solution simultaneously to the phase shifter and VSC equipment is regulated, to the phase shifter and VSC equipment is coordinated control.By the coordinated control of the application, the number of mechanical tap adjustment of phase shifting transformer can be as few as possible, so as to reduce the large fluctuation of power flow while effectively reducing equipment loss, improve equipment service life.

Description

Technical Field

[0001] This invention relates to the field of power grid control technology, and more specifically, to a method and system for coordinated control of phase shifters and VSC devices. Background Technology

[0002] Based on my country's "dual-carbon" development strategy and the State Grid's new power system development goals, new energy sources, characterized by strong randomness, volatility, and intermittency, will be connected to the power grid on a large scale, either centrally or in a distributed manner. This will increase the randomness of the spatiotemporal distribution of power flow in the power grid, leading to uneven power flow distribution along transmission lines. Bottlenecks in transmission sections and idle transmission capacity will coexist in the power grid, hindering the full utilization of the grid's overall power transmission capacity. Therefore, introducing hybrid power flow controllers into the power system to optimize power flow control at transmission sections and thereby improve transmission capacity is a development trend for new energy power systems.

[0003] Hybrid power flow controllers typically consist of two parts: a phase-shifting transformer and a voltage source converter (VSC). Each part has its own advantages and disadvantages. The phase-shifting transformer is a traditional mechanical power flow controller, offering advantages such as large capacity, good stability, and low engineering cost. Its disadvantages include a mechanical on-load tap changer, which cannot perform continuous and smooth regulation, and a long mechanical contact actuation time, resulting in slow power flow regulation. Voltage source converters, such as UPFCs, utilize controllable power electronic devices, enabling rapid and continuous power flow regulation, but they suffer from disadvantages such as large size and high cost. Summary of the Invention

[0004] To address the above problems, this invention proposes a method for coordinated control of phase shifters and VSC devices, comprising:

[0005] Obtain the power output forecast curves and load forecast curves of wind power and photovoltaic power plants in the future preset period. Based on the power output forecast curves and load forecast curves, determine the power flow change curves of the key lines of the power grid in the future preset period.

[0006] Based on the power flow change curve, determine the power adjustment amount of the hybrid power flow controller at each time point within the future preset time period;

[0007] Based on the power regulation amount, an objective function is established for coordinated control of the phase shifter and VSC device inside the hybrid power flow controller.

[0008] The optimal solution of the objective function is obtained by using a preset algorithm. Based on the optimal solution, the phase shifter and VSC device are simultaneously adjusted to achieve coordinated control of the phase shifter and VSC device.

[0009] Optionally, the power flow change curve of the critical power grid line within the future preset time period is determined by: performing time-domain simulation calculations on the power grid based on the output prediction curve and the load prediction curve to determine the power flow change curve of the critical power grid line within the future preset time period.

[0010] Optionally, the calculation formula for the power regulation of the hybrid power flow controller at each time point is as follows:

[0011]

[0012] in, For time period i The power regulation of the internal hybrid power flow controller. and These represent the current power and the power corresponding to the thermal stability limit of the critical power lines, respectively.

[0013] Optionally, the method further includes: optimizing the objective function using a preset optimization strategy, the expression of which is as follows:

[0014]

[0015] in, Used to indicate time period i Has the tap of the internal phase shifter changed? If so, then... It is 1 if it is true, otherwise it is 0. f Describe the objective function. n Consider the number of time periods for the strategy.

[0016] Optional objective function, as follows:

[0017]

[0018] in, For time period i The power regulation of the internal phase shifter in the internal hybrid power flow controller. This represents the maximum power adjustment amount for the VSC device. For time period i The power regulation of the internal hybrid power flow controller.

[0019] Optionally, the optimal solution is the determined tap position of the phase shifter for each time period, and the power regulation amount of the VSC device.

[0020] Furthermore, the present invention also provides a system for coordinated control of a phase shifter and a VSC device, comprising:

[0021] The prediction unit is used to acquire the power output prediction curves and load prediction curves of wind power and photovoltaic power plants in the future preset period of the power grid, and based on the power output prediction curves and load prediction curves, determine the power flow change curves of the key lines of the power grid in the future preset period of the power grid.

[0022] The first calculation unit is used to determine the power adjustment amount of the hybrid power flow controller at each time point within the future preset time period based on the power flow change curve.

[0023] The second calculation unit is used to establish an objective function for coordinated control of the phase shifter and VSC device inside the hybrid power flow controller, based on the power regulation amount.

[0024] The solution unit is used to obtain the optimal solution of the objective function using a preset algorithm, and to simultaneously regulate the phase shifter and VSC device based on the optimal solution, so as to coordinate the control of the phase shifter and VSC device.

[0025] Optionally, the prediction unit determines the power flow change curve of the critical power grid line within the future preset time period, specifically by performing time-domain simulation calculations on the power grid based on the output prediction curve and the load prediction curve, in order to determine the power flow change curve of the critical power grid line within the future preset time period.

[0026] Optionally, the calculation formula for the power regulation of the hybrid power flow controller at each time point is as follows:

[0027]

[0028] in, For time period i The power regulation of the internal hybrid power flow controller. and These represent the current power and the power corresponding to the thermal stability limit of the critical power lines, respectively.

[0029] Optionally, the second computational unit is further configured to: optimize the objective function using a preset optimization strategy, the expression of which is as follows:

[0030]

[0031] in, Used to indicate time period i Has the tap of the internal phase shifter changed? If so, then... It is 1 if it is true, otherwise it is 0. f Describe the objective function. n Consider the number of time periods for the strategy.

[0032] Optional objective function, as follows:

[0033]

[0034] in, For time period i The power regulation of the internal phase shifter in the internal hybrid power flow controller. This represents the maximum power adjustment amount for the VSC device. For time period i The power regulation of the internal hybrid power flow controller.

[0035] Optionally, the optimal solution is the determined tap position of the phase shifter for each time period, and the power regulation amount of the VSC device.

[0036] In another aspect, the present invention also provides a computing device, comprising: one or more processors;

[0037] A processor is used to execute one or more programs;

[0038] When the one or more programs are executed by the one or more processors, the method described above is implemented.

[0039] In another aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the method described above.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] This invention proposes a method for coordinated control of phase shifters and VSC devices, comprising: acquiring the output forecast curves and load forecast curves of wind power and photovoltaic power plants in the power grid within a future preset time period; determining the power flow change curves of critical lines in the power grid within the future preset time period based on the output forecast curves and load forecast curves; determining the power regulation amount of the hybrid power flow controller at each time point within the future preset time period based on the power flow change curves; establishing an objective function for coordinated control of the phase shifters and VSC devices within the hybrid power flow controller based on the power regulation amount; obtaining the optimal solution of the objective function using a preset algorithm; and simultaneously regulating the phase shifters and VSC devices based on the optimal solution to achieve coordinated control of the phase shifters and VSC devices. Through the coordinated control of this invention, the number of mechanical tap adjustments of the phase shifter transformer can be minimized, thereby effectively reducing equipment losses and improving equipment lifespan while reducing large fluctuations in power flow. Attached Figure Description

[0042] Figure 1 This is a flowchart of the method of the present invention;

[0043] Figure 2 This is a flowchart of an embodiment of the method of the present invention;

[0044] Figure 3 This is a schematic diagram of the power regulation amount of the hybrid power flow controller in an embodiment of the method of the present invention;

[0045] Figure 4 This is a schematic diagram of the phase shifter power adjustment amount in an embodiment of the method of the present invention;

[0046] Figure 5 This is a typical circuit structure diagram of an embodiment of the method of the present invention;

[0047] Figure 6 This is a power regulation curve of a certain line in an embodiment of the method of the present invention;

[0048] Figure 7 This is a curve showing the adjustment amount of the phase shifter using conventional methods.

[0049] Figure 8 This is a graph showing the adjustment amount of the phase shifter in an embodiment of the method of the present invention;

[0050] Figure 9 This is a curve of VSC adjustment amount using the conventional method;

[0051] Figure 10 This is a VSC adjustment curve diagram of an embodiment of the method of the present invention;

[0052] Figure 11 This is a structural diagram of the system of the present invention. Detailed Implementation

[0053] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0054] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0055] Example 1:

[0056] This invention proposes a method for coordinated control of phase shifters and VSC devices, such as... Figure 1 As shown, it includes:

[0057] Step 1: Obtain the power output forecast curves and load forecast curves of wind power and photovoltaic power plants in the future preset time period. Based on the power output forecast curves and load forecast curves, determine the power flow change curves of the key lines of the power grid in the future preset time period.

[0058] Step 2: Based on the power flow change curve, determine the power adjustment amount of the hybrid power flow controller at each time point within the future preset time period;

[0059] Step 3: Based on the power regulation amount, establish the objective function for coordinated control of the phase shifter and VSC device inside the hybrid power flow controller;

[0060] Step 4: Use a preset algorithm to obtain the optimal solution of the objective function, and simultaneously adjust the phase shifter and VSC device based on the optimal solution to coordinate the control of the phase shifter and VSC device.

[0061] Specifically, determining the power flow change curve of the critical power grid line within the future preset time period involves performing time-domain simulation calculations on the power grid based on the output prediction curve and the load prediction curve to determine the power flow change curve of the critical power grid line within the future preset time period.

[0062] The calculation formulas for the power regulation of the hybrid power flow controller at each time point are as follows:

[0063]

[0064] in, For time period i The power regulation of the internal hybrid power flow controller. and These represent the current power and the power corresponding to the thermal stability limit of the critical power lines, respectively.

[0065] The method further includes: optimizing the objective function using a preset optimization strategy, the expression of which is as follows:

[0066]

[0067] in, Used to indicate time period i Has the tap of the internal phase shifter changed? If so, then... It is 1 if it is true, otherwise it is 0. f Describe the objective function. n Consider the number of time periods for the strategy.

[0068] The objective function is as follows:

[0069]

[0070] in, For time period i The power regulation of the internal phase shifter in the internal hybrid power flow controller. This represents the maximum power adjustment amount for the VSC device. For time period i The power regulation of the internal hybrid power flow controller.

[0071] The optimal solution is determined by the tap position of the phase shifter for each time period and the power regulation amount of the VSC equipment.

[0072] The present invention will be further described below with reference to specific implementations:

[0073] The steps of implementing this invention are as follows: Figure 2 As shown, it includes the following:

[0074] Step 1: Collect the output forecast curves and load forecast curves of wind power and photovoltaic power plants within the future time period T (e.g., 96 points per day) provided by the power grid. Based on the above curves, use power system analysis and calculation software such as PSD-BPA to obtain the power flow change curves of critical lines within the future time period T through time-domain simulation calculation.

[0075] Step 2: Determine the power regulation of the hybrid power flow controller at each time point within time period T.

[0076] In actual power grid operation, the power flow control of the hybrid power flow controller on the line is often based on the thermal stability limit of that line. When the actual current of the line exceeds the thermal stability limit of the line, the hybrid power flow controller should adjust the power flow of the line in a timely manner to limit the line current within the thermal stability limit range. Therefore, based on the power flow change curve of the key line in step one, combined with the thermal stability limit of each line, the power regulation of the hybrid power flow controller at each time point in time period T is calculated by equation (1):

[0077] (1)

[0078] in, The power regulation amount of the power flow controller within time period i. and These are the current power and the power corresponding to the thermal stability limit of the critical path, respectively. The relationships between the variables are as follows: Figure 3 As shown.

[0079] Step 3: Establish the objective function of the control strategy.

[0080] Hybrid power flow controllers typically consist of two parts: a phase-shifting transformer and a voltage source converter (VSC). The phase-shifting transformer is a traditional mechanical power flow controller, offering advantages such as large capacity, good stability, and low engineering cost. Its disadvantage is that the on-load tap changer is a mechanical operating mechanism, preventing continuous and smooth regulation. VSC devices, such as UPFCs, utilize controllable power electronic devices, enabling rapid and continuous power flow regulation, but they suffer from drawbacks such as large size and high cost.

[0081] Based on the above characteristics, the large adjustment range of the phase-shifting transformer should be utilized when formulating control strategies, allowing it to undertake the main control tasks. Figure 4 The majority of basic adjustment tasks in the process are handled by the VSC equipment, while the remaining minor and precise adjustment tasks are undertaken by the VSC equipment. At the same time, since changing the taps of the phase-shifting transformer can easily cause power flow impact and equipment loss, the number of tap adjustments should be minimized.

[0082] by Figure 5 Taking the typical line shown as an example, we analyze the effect of the phase-shifting transformer on the power flow regulation of the line.

[0083] After adding the phase-shifting transformer, the line power P is:

[0084] (2)

[0085] in, , The voltage values ​​at both ends of the line. For line reactance, The angle difference between the voltages at both ends of the line. For the leakage reactance of the phase shifter, The adjustment angle of the phase shifter is related to the tap position k of the phase shifter and the adjustment angle of each position. related:

[0086] (3)

[0087] The power regulation of the phase-shifting transformer during time period i is obtained from equations (1), (2), and (3). Relationship with gear shift tap:

[0088] (4)

[0089] Based on the actual distribution of phase shifter positions and the regulation capacity of VSC, and combined with the power regulation curve of the hybrid power flow controller in step two, an optimization strategy is established with the constraint of meeting power control requirements and the objective function of minimizing the number of phase shifter position adjustments:

[0090] (5)

[0091] in This characterizes whether the phase shifter taps change within time period i; if they change, the value is 1, otherwise it is 0.

[0092] Constraint functions:

[0093] (6)

[0094] in The power regulation of the phase shifter during time period i. This is the maximum power regulation amount for the VSC device.

[0095] Step 4: Use the optimal particle swarm optimization algorithm (an arbitrary optimization method) to optimize and solve the objective function.

[0096] Particle swarm optimization (PSO) is an evolutionary computation technique based on swarm intelligence. Its advantages lie in its simplicity and ease of implementation, coupled with a profound intelligent background, making it particularly suitable for engineering applications. The idea behind PSO originates from the study of bird flock foraging behavior. It treats each solution to the optimization problem as an independent "particle," assigning a specific function to each particle and searching for the optimal solution by defining the particle's velocity and direction.

[0097] When the wind power, solar power output, and load forecast data are N points within a time period T, and the total number of particles in the particle swarm is set to M, any particle... and its velocity vector The dimension is N:

[0098] (7)

[0099] (8)

[0100] in, The position of the phase shifter tap at time point j. for The rate of change.

[0101] According to formulas (9) and (10), the particles and its velocity vector Continuously updated:

[0102] (9)

[0103] (10)

[0104] in, P i and P gThese are the optimal position found by the current particle and the optimal position of the entire particle swarm, respectively. c 1 and c 2 These are learning factors, representing the weighting coefficients for a particle tracking its own historical best value and the group's best value, respectively. r 1 and r 2 It is a random number that follows a uniform distribution in the interval [0,1].

[0105] In the formula, ω This is the inertia factor. A larger one... ω A value that is advantageous for escaping local minima, while a smaller value... ω The value is beneficial for algorithm convergence, therefore adaptive adjustment is adopted. ω The strategy for the value decreases linearly as iterations proceed. ω The value of .

[0106] (11)

[0107] In the formula, ω max and ω min These are the maximum and minimum values ​​for the inertia factor, respectively. t This represents the current iteration number; s This represents the maximum number of iterations for the algorithm.

[0108] By adjusting parameters such as initial particle value, velocity, and number of iterations, the objective function is solved, and the optimal configuration of phase shifter positions in each time-segmented hybrid power flow controller is finally obtained.

[0109] Based on the obtained tap positions of the phase shifter for each time period, and combined with equation (4), the adjustment amount of the phase shifter on the line power is calculated. Based on this, the power adjustment amount of the VSC equipment is calculated:

[0110] (12)

[0111] To verify the feasibility and superiority of the control method proposed in this invention, a regional power grid containing a photovoltaic power station was selected for verification. Due to the fluctuations and randomness in the power output of the photovoltaic power station, and based on the power output prediction curve of the photovoltaic power station, the power regulation of a certain line in the regional power grid was calculated using steps one and two, as follows: Figure 6 As shown.

[0112] The hybrid power flow controller installed on this line has a phase-shifting transformer section with 5 levels, each with a power regulation range of 20MW, and a continuously adjustable VSC section with a regulation range of 30MW. A conventional control method, which uses the phase-shifting transformer to track the power regulation curve and the VSC section for supplementary regulation, is selected as a comparison method; hereinafter referred to as the conventional method.

[0113] Calculations show that the adjustment amount (i.e., the tap change) of the transformer under the conventional method and this method are as follows: Figure 7 and Figure 8 As shown, it can be observed that the number of phase shifter adjustments is significantly reduced when using this method compared to the conventional method. Statistics show that the conventional method requires 14 adjustments, while this method only requires 6, a reduction of 57.14%.

[0114] The adjustment curves of the VSC device under the conventional method and this method are attached. Figure 9 and 10 As shown, this method fully utilizes the regulating function of the VSC device, resulting in a larger regulating amount of the VSC device compared to conventional methods. This reduces the number of times the phase shifter settings are adjusted, thus achieving coordinated and optimized control of the VSC device and the phase shifter transformer.

[0115] As can be seen from the above calculation results, the control method proposed in this paper can significantly reduce the number of gear adjustments of the phase shifter inside the hybrid power flow controller, thereby effectively reducing equipment wear while reducing large fluctuations in power flow, which is conducive to improving the service life of the equipment.

[0116] Example 2:

[0117] The present invention also provides a system 200 for coordinated control of phase shifters and VSC devices, such as... Figure 11 As shown, it includes:

[0118] The prediction unit 201 is used to acquire the power output prediction curve and load prediction curve of the power grid for wind power and photovoltaic power plants in the future preset period, and based on the power output prediction curve and load prediction curve, determine the power flow change curve of the key line of the power grid in the future preset period.

[0119] The first calculation unit 202 is used to determine the power adjustment amount of the hybrid power flow controller at each time point within the future preset time period based on the power flow change curve.

[0120] The second calculation unit 203 is used to establish an objective function for coordinated control of the phase shifter and VSC device inside the hybrid power flow controller based on the power regulation amount.

[0121] The solving unit 204 is used to obtain the optimal solution of the objective function using a preset algorithm, and to simultaneously regulate the phase shifter and VSC device based on the optimal solution, so as to coordinate the control of the phase shifter and VSC device.

[0122] Specifically, the prediction unit determines the power flow change curve of the critical power grid line within the future preset time period by performing time-domain simulation calculations on the power grid based on the output prediction curve and the load prediction curve to determine the power flow change curve of the critical power grid line within the future preset time period.

[0123] The calculation formulas for the power regulation of the hybrid power flow controller at each time point are as follows:

[0124]

[0125] in, For time period i The power regulation of the internal hybrid power flow controller. and These represent the current power and the power corresponding to the thermal stability limit of the critical power lines, respectively.

[0126] The second calculation unit is further configured to: optimize the objective function using a preset optimization strategy, the expression of which is as follows:

[0127]

[0128] in, Used to indicate time period i Has the tap of the internal phase shifter changed? If so, then... It is 1 if it is true, otherwise it is 0. f Describe the objective function. n Consider the number of time periods for the strategy.

[0129] The objective function is as follows:

[0130]

[0131] in, For time period i The power regulation of the internal phase shifter in the internal hybrid power flow controller. This represents the maximum power adjustment amount for the VSC device. For time period i The power regulation of the internal hybrid power flow controller.

[0132] The optimal solution is determined by the tap position of the phase shifter for each time period and the power regulation amount of the VSC equipment.

[0133] Through the coordinated control of this invention, the number of mechanical tap adjustments of the phase-shifting transformer can be minimized, thereby effectively reducing equipment losses and improving equipment lifespan while reducing large fluctuations in power flow.

[0134] Example 3:

[0135] Based on the same inventive concept, this invention also provides a computer device, which includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement corresponding method flows or corresponding functions, thereby implementing the steps of the methods in the above embodiments.

[0136] Example 4:

[0137] Based on the same inventive concept, this invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiments.

[0138] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0139] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0140] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0141] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0142] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0143] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for coordinated control of a phase shifter and a VSC device, characterized in that, The method includes: Obtain the power output forecast curves and load forecast curves of wind power and photovoltaic power plants in the future preset period. Based on the power output forecast curves and load forecast curves, determine the power flow change curves of the key lines of the power grid in the future preset period. Based on the power flow change curve, determine the power adjustment amount of the hybrid power flow controller at each time point within the future preset time period; Based on the power regulation amount, an objective function is established for coordinated control of the phase shifter and VSC device inside the hybrid power flow controller. The optimal solution of the objective function is obtained by using a preset algorithm, and the phase shifter and VSC device are simultaneously adjusted based on the optimal solution to achieve coordinated control of the phase shifter and VSC device. The calculation formulas for the power regulation of the hybrid power flow controller at each time point are as follows: in, For time period i The power regulation of the internal hybrid power flow controller. and These are the current power and the power corresponding to the thermal stability limit of the critical power lines, respectively. The objective function is optimized using a preset optimization strategy, the expression of which is as follows: in, Used to indicate time period i Has the tap of the internal phase shifter changed? If so, then... It is 1 if it is 1, otherwise it is 0. f Describe the objective function. n Consider the number of time periods for the strategy; The objective function is as follows: in, For time period i The power regulation of the internal phase-shifting transformer. This represents the maximum power adjustment amount for the VSC device. For time period i The power regulation of the internal hybrid power flow controller.

2. The method according to claim 1, characterized in that, The determination of the power flow change curve of the critical power grid line within the future preset time period specifically involves: performing time-domain simulation calculations on the power grid based on the output prediction curve and the load prediction curve to determine the power flow change curve of the critical power grid line within the future preset time period.

3. The method according to claim 1, characterized in that, The optimal solution is the determined tap position of the phase shifter for each time period, and the power adjustment amount of the VSC device.

4. A system for coordinated control of a phase shifter and a VSC device, characterized in that, The system includes: The prediction unit is used to acquire the output prediction curves and load prediction curves of wind power and photovoltaic power plants in the future preset period of the power grid, and based on the output prediction curves and load prediction curves, determine the power flow change curves of the key lines of the power grid in the future preset period of the power grid. The first calculation unit is used to determine the power adjustment amount of the hybrid power flow controller at each time point within the future preset time period based on the power flow change curve. The second calculation unit is used to establish an objective function for coordinated control of the phase shifter and VSC device inside the hybrid power flow controller, based on the power regulation amount. The solution unit is used to obtain the optimal solution of the objective function using a preset algorithm, and to simultaneously regulate the phase shifter and VSC device based on the optimal solution, so as to coordinate the control of the phase shifter and VSC device. The calculation formulas for the power regulation of the hybrid power flow controller at each time point are as follows: in, For time period i The power regulation of the internal hybrid power flow controller. and These are the current power and the power corresponding to the thermal stability limit of the critical power lines, respectively. The second computing unit is further configured to: optimize the objective function using a preset optimization strategy, the expression of which is as follows: in, Used to indicate time period i Has the tap of the internal phase shifter changed? If so, then... It is 1 if it is 1, otherwise it is 0. f Describe the objective function. n Consider the number of time periods for the strategy; The objective function is as follows: in, For time period i The power regulation of the internal phase-shifting transformer. This represents the maximum power adjustment amount for the VSC device. For time period i The power regulation of the internal hybrid power flow controller.

5. The system according to claim 4, characterized in that, The prediction unit determines the power flow change curve of the critical power grid line within the future preset time period by performing time-domain simulation calculations on the power grid based on the output prediction curve and the load prediction curve to determine the power flow change curve of the critical power grid line within the future preset time period.

6. The system according to claim 4, characterized in that, The optimal solution is the determined tap position of the phase shifter for each time period, and the power adjustment amount of the VSC device.

7. A computer device, characterized in that, include: One or more processors; A processor is used to execute one or more programs; When the one or more programs are executed by the one or more processors, the method described in any one of claims 1-3 is implemented.

8. A computer-readable storage medium, characterized in that, It contains a computer program, which, when executed, implements the method as described in any one of claims 1-3.

Images