Parameter design method and device for double-core symmetrical controllable phase shifter

Abstract

The invention provides a parameter design method and device for a double-core symmetrical controllable phase shifter, and relates to the technical field of power grids. According to the method, firstly, key performance indexes such as a phase shifting angle, rated capacity, rated voltage, rated current and a short-circuit impedance range of the controllable phase shifter are determined based on system design requirements and constraint conditions, then accurate calculation is carried out according to the key performance indexes, the rated transformation ratio of a series transformer and a parallel transformer of the controllable phase shifter is determined, and the controllable phase shifter is obtained. The core component parameters such as the rated voltage, the rated current and the rated capacity of each winding are obtained, and the layered parameter design thought of first integration and then component is achieved; the overall performance index of the phase shifter is determined from the global demand of the power system, it is ensured that the design target is highly consistent with the system demand, the problem of disjunction with the overall operation condition possibly caused by direct component design is avoided, the overall performance optimization can be achieved, and the problem that a traditional parameter design method of the controllable phase shifter is unreasonable is solved.

Description

Technical Field

[0001] This invention relates to the field of power grid technology, and in particular to a parameter design method and apparatus for a dual-core symmetrical controllable phase shifter. Background Technology

[0002] With the development of power systems and the increasing interconnectivity, the power flow distribution of transmission lines has become increasingly complex, often resulting in problems such as some lines being heavily loaded while others are lightly loaded, circulating currents, and blocked sections, which affect the safe and stable operation of the power grid and its economic benefits. Flexible AC Transmission Systems (FACTS) technology provides an effective means to solve these problems.

[0003] The Thyristor Controlled Phase Shifting Transformer (TCPST) is an important member of the FACTS family. TCPST achieves precise and rapid control of active power flow by injecting a phase-adjustable series voltage into the transmission line, thereby changing the equivalent phase angle difference between the two ends of the line. This plays a crucial role in optimizing power flow distribution in the power grid, improving transmission capacity, enhancing system stability, and suppressing power oscillations. Among various TCPST topologies, the dual-core symmetrical TCPST has broad application prospects in specific application scenarios (such as power grids in densely populated areas) due to its advantages such as a large phase shift angle adjustment range, flexible design, and good adaptability to system disturbances. However, whether the performance of the dual-core symmetrical TCPST can be fully realized and whether its operation is stable and reliable largely depends on the accuracy and rationality of its parameter design.

[0004] Currently, the parameter design of controllable phase shifters focuses on directly calculating and selecting parameters for internal components such as series and parallel transformers, ignoring the actual operating condition of the controllable phase shifter being connected to the power system as a whole. This results in a deviation between the overall performance indicators of the controllable phase shifter and the system requirements, and unreasonable parameter design. Summary of the Invention

[0005] This invention provides a parameter design method and apparatus for a dual-core symmetrical controllable phase shifter, which solves the problem of unreasonable traditional parameter design methods for controllable phase shifters.

[0006] In a first aspect, the present invention provides a parameter design method for a dual-core symmetrical controllable phase shifter. The method includes: obtaining the system design requirements and constraints of the controllable phase shifter; determining the key performance indicators of the controllable phase shifter based on the system design requirements and constraints, including phase shift angle, rated capacity, rated voltage, rated current, and short-circuit impedance range; performing precise calculations based on the internal topology of the controllable phase shifter and the key performance indicators to determine the core component parameters of the controllable phase shifter, including the rated turns ratio of the series transformer and the parallel transformer, as well as the rated voltage, rated current, and rated capacity of each winding; and generating a parameter design scheme for the controllable phase shifter based on the key performance indicators and core component parameters.

[0007] Secondly, embodiments of the present invention provide a parameter design device for a dual-core symmetrical controllable phase shifter. This device includes a communication module and a processing module. The communication module is used to acquire the system design requirements and constraints of the controllable phase shifter. The processing module is used to determine the key performance indicators of the controllable phase shifter based on the system design requirements and constraints. These key performance indicators include phase shift angle, rated capacity, rated voltage, rated current, and short-circuit impedance range. Based on the internal topology of the controllable phase shifter and the key performance indicators, the processing module performs precise calculations to determine the core component parameters of the controllable phase shifter. These core component parameters include the rated turns ratio of the series transformer and the parallel transformer, as well as the rated voltage, rated current, and rated capacity of each winding. Based on the key performance indicators and core component parameters, a parameter design scheme for the controllable phase shifter is generated.

[0008] Thirdly, embodiments of the present invention provide an electronic device including a memory and a processor. The memory stores a computer program, and the processor is configured to call and run the computer program stored in the memory to perform the steps of the method as described in the first aspect and any possible implementation thereof.

[0009] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program, characterized in that, when the computer program is executed by a processor, it implements the steps of the method as described in the first aspect and any possible implementation thereof.

[0010] This invention provides a parameter design method and apparatus for a dual-core symmetrical controllable phase shifter. First, based on system design requirements and constraints, the invention determines key performance indicators of the controllable phase shifter, such as phase shift angle, rated capacity, rated voltage, rated current, and short-circuit impedance range. Then, based on these key performance indicators, precise calculations are performed to determine the rated turns ratio of the series and parallel transformers of the controllable phase shifter, as well as the core component parameters such as rated voltage, rated current, and rated capacity of each winding. This realizes a hierarchical parameter design approach, starting with the overall system and then moving to individual components. By determining the overall performance indicators of the phase shifter from the perspective of the overall power system requirements, the invention ensures a high degree of consistency between the design objectives and system requirements, avoiding the problem of disconnection from overall operating conditions that may result from directly designing individual components. This helps to achieve optimal overall performance, solves the problem of unreasonable traditional parameter design methods for controllable phase shifters, and improves the rationality of controllable phase shifter parameter design. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a flowchart illustrating a parameter design method for a dual-core symmetrical controllable phase shifter provided in an embodiment of the present invention. Figure 2 This is an equivalent schematic diagram of a dual-core symmetrical controllable phase shifter connected to a transmission line according to an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the relationship between the voltage phasors and the phase shift angle of a dual-core symmetrical controllable phase shifter provided in an embodiment of the present invention. Figure 4 This is a schematic diagram showing the relationship between the current phasors and the phase shift angle of a dual-core symmetrical controllable phase shifter provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the equivalent circuit of phase A of a dual-core symmetrical controllable phase shifter provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the system structure of a certain ring network power system provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the active power change after a dual-core symmetrical controllable phase shifter is connected, according to an embodiment of the present invention. Figure 8 This is a schematic diagram comparing the input and output voltages of phase A of a dual-core symmetrical controllable phase shifter provided in an embodiment of the present invention; Figure 9This is a schematic diagram of the parameter design device for a dual-core symmetrical controllable phase shifter provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0013] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0014] In the description of this invention, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, "at least one" and "more than one" refer to two or more. The terms "first," "second," etc., do not limit the quantity or order of execution, and "first," "second," etc., do not necessarily imply differences.

[0015] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0016] Furthermore, the terms "comprising" and "having," and any variations thereof, used in the description of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or modules is not limited to the steps or modules listed, but may optionally include other steps or modules not listed, or may optionally include other steps or modules inherent to such process, method, product, or device.

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0018] As described in the background section, current parameter design methods for controllable phase shifters lack a systematic top-level design approach, often focusing on directly calculating and selecting parameters for internal components such as series and parallel transformers. This method ignores the actual operating condition of the controllable phase shifter being connected to the power system as a whole, failing to first determine the overall performance indicators (such as overall phase shift range, rated capacity, and overall impedance characteristics) that the phase shifter should meet at the system level based on power flow control objectives, grid constraints, and economic requirements. This results in the final designed equipment potentially failing to optimally meet system requirements and exhibiting unreasonable parameter matching.

[0019] The calculation of component parameters is often simplified or biased. When determining the specific parameters (such as turns ratio, rated voltage, rated current, and capacity) of series and parallel transformers, calculations are often based on simplified assumptions. For example, when determining the turns ratio of a parallel transformer, the influence of leakage reactance of series and parallel transformers on phase shift capability and internal voltage distribution is not fully considered; when determining the rated voltage / rated current of each winding, the selection is not based on the principle of the maximum voltage / current stress that the equipment can withstand throughout the entire operating range (especially under extreme conditions), resulting in insufficient or excessive insulation margin; when determining the rated capacity, there is a lack of rigorous derivation based on precise electrical phasor relationships and power transmission relationships.

[0020] The design process is not sufficiently integrated with actual needs, and it fails to provide a clear, systematic design process that starts from system requirements and delves into component parameters layer by layer. This may result in the design process relying too much on experience or lacking coordination between parameters, making it difficult to guarantee the optimal performance and economy of the final product.

[0021] In summary, there are still shortcomings in the parameter design of dual-core symmetrical controllable phase shifters, especially in the systematic top-level design, accurate calculation of key parameters, and the completeness and rationality of the design process, which need to be improved.

[0022] To solve the above technical problems, such as Figure 1 As shown, this embodiment of the invention provides a parameter design method for a dual-core symmetrical controllable phase shifter. The method includes steps S101-S104.

[0023] S101. Obtain the system design requirements and constraints for the controllable phase shifter.

[0024] In some embodiments, system design requirements include: active power regulation requirements, system rated voltage, system rated current, minimum short-circuit current withstand capability, and maximum allowable power loss; constraints include: line reactive power constraints, active power upper limit constraints, and safety margin constraints.

[0025] S102. Based on system design requirements and constraints, determine the key performance indicators of the controllable phase shifter.

[0026] In some embodiments, key performance indicators include phase shift angle, rated capacity, rated voltage, rated current, and short-circuit impedance range.

[0027] As one possible implementation, step S102 can be specifically implemented as steps S1021-S1026.

[0028] S1021. Based on the adjustment requirements of active power, the reactive power constraint of the line, and the upper limit constraint of active power, solve for the maximum transmission power and determine the phase shift angle.

[0029] like Figure 2 As shown in the figure, an embodiment of the present invention provides an equivalent schematic diagram of a dual-core symmetrical controllable phase shifter connected to a transmission line. This is the sending voltage. The receiving-end voltage, For the reactance of the transmission line, This is the reactance of the phase shifter. The voltage injected into the phase shifter, This is the output voltage of the phase shifter.

[0030] For example, embodiments of the present invention can determine the phase shift angle of a dual-core symmetrical controllable phase shifter based on the system's active power regulation requirements. To maximize the adjustment capability of the phase shifter, the phase shift angle is calculated based on the following formula. Active power transmitted by the line Take the maximum value, while ensuring that the reactive power regulation cannot be less than the minimum reactive power required for the transmission line to maintain stable operation. It cannot exceed the upper limit of active power that the transmission line can transmit. .

[0031] ; The constraints are: ; ; in, This represents the phase difference between the sending-end voltage and the receiving-end voltage.

[0032] S1022. Determine the preliminary rated capacity based on the system rated voltage and system rated current.

[0033] S1023. Based on the cost and benefits of each level of the rated capacity of the controllable phase shifter, the initial rated capacity is revised to determine the rated capacity of the controllable phase shifter.

[0034] For example, embodiments of the present invention can construct a total revenue function based on the cost and benefits of each level of the rated capacity of the controllable phase shifter; based on the total revenue function and the constraints of the rated capacity of the controllable phase shifter, the initial rated capacity is corrected to determine the rated capacity of the controllable phase shifter.

[0035] For example, embodiments of the present invention can be based on the rated voltage of the transmission line. With rated current Determine the initial capacity of the phase shifter Then, through rigorous cost-benefit analysis, a rated capacity is determined that can both meet core regulatory needs and achieve the best return on investment. .

[0036] Constraints: ; The formula for calculating capacity when determining the optimal investment benefit is as follows: Represents the final total revenue. The revenue coefficient per unit capacity of the phase shifter. This represents the expected lifespan of the phase shifter. The total revenue is maximized while satisfying the constraints. The value of is the rated capacity.

[0037] .

[0038] S1024. The rated voltage of the controllable phase shifter shall be the rated voltage of the transmission line system.

[0039] S1025. Based on the rated voltage and rated capacity of the controllable phase shifter, determine the rated current of the controllable phase shifter.

[0040] For example, in this embodiment of the invention, the rated voltage level of the transmission line to which the phase shifter is installed can be selected as the rated voltage of the phase shifter as a whole. The rated current can be calculated from the rated capacity obtained above: .

[0041] S1026. Determine the short-circuit impedance range based on the maximum allowable power loss and the minimum short-circuit current withstand capability.

[0042] In some embodiments, the short-circuit impedance range includes an upper limit and a lower limit.

[0043] For example, embodiments of the present invention can calculate the upper limit of the short-circuit impedance based on the maximum permissible power loss. For instance, embodiments of the present invention can calculate the upper limit of the short-circuit impedance based on the maximum permissible power loss. Determine Excessive short-circuit impedance can lead to significant internal voltage drop and operating losses. To ensure stable operation of the phase shifter, internal power loss must not exceed the power loss limit. It should meet the following requirements: .

[0044] For example, embodiments of the present invention can calculate the lower limit of short-circuit impedance based on the minimum short-circuit current withstand capability. For instance, it can determine the lower limit based on the minimum short-circuit current withstand capability. Excessively low short-circuit impedance can lead to excessive short-circuit current flowing through the phase shifter during a fault. To ensure that, under the most severe system short-circuit conditions, the expected short-circuit current flowing through the phase shifter does not exceed the equipment's tolerance limit... and retain the necessary safety margin. Short-circuit impedance It should meet the following requirements: .

[0045] in, This is the resistance of the power transmission circuit.

[0046] S103. Based on the internal topology of the controllable phase shifter and its key performance indicators, perform precise calculations to determine the core component parameters of the controllable phase shifter.

[0047] In some embodiments, the core component parameters include the rated turns ratio of the series transformer and the parallel transformer, as well as the rated voltage, rated current and rated capacity of each winding.

[0048] As one possible implementation, step S103 can be specifically implemented as steps S1031-S1034.

[0049] S1031. Based on the rated current and phase shift angle of the controllable phase shifter, as well as its internal topology, calculate the turns ratio of the series transformer and the turns ratio of the parallel transformer.

[0050] For example, embodiments of the present invention can be based on the rated current of the phase shifter calculated above. and the rated current of the control circuit To calculate the turns ratio of a series transformer The formula is: .

[0051] The phase shift angle of the phase shifter calculated above is... and series transformer turns ratio To calculate the turns ratio of parallel transformers The formula is: .

[0052] S1032. Based on the rated voltage and phase shift angle of the controllable phase shifter, and the maximum voltage stress borne by each winding, calculate the rated voltage of each winding.

[0053] For example, step S1032 can be specifically implemented as steps A1-A4.

[0054] A1. Taking the maximum value of the phase shift angle, calculate the rated voltage of the primary winding of the series transformer based on the rated voltage of the controllable phase shifter.

[0055] A2. With a phase shift angle of 0, calculate the rated voltage of the primary winding of the parallel transformer based on the rated voltage of the controllable phase shifter.

[0056] A3. Based on the turns ratio of the series transformer and the rated voltage of the primary winding of the series transformer, calculate the rated voltage of the secondary winding of the series transformer.

[0057] A4. Based on the turns ratio of the parallel transformer and the rated voltage of the primary winding of the parallel transformer, calculate the rated voltage of the secondary winding of the parallel transformer.

[0058] like Figure 3 As shown in the diagram, this embodiment of the invention provides a schematic diagram illustrating the relationship between the voltage phasors of a dual-core symmetrical controllable phase shifter and the phase shift angle. This embodiment of the invention can be based on the overall rated voltage of the aforementioned phase shifter. Calculate the rated voltage of each winding based on the maximum voltage stress encountered during operation. Rated voltage of the primary winding of a series transformer. The voltage stress is greatest when the dual-core symmetrical controllable phase shifter reaches its maximum phase shift angle; the rated voltage of the primary winding of the parallel transformer. The voltage stress is maximum when the phase shift angle of the dual-core symmetrical controllable phase shifter is 0. The calculation formula is: ; ; Based on the above calculations, the ratio and The formula for calculating the rated voltage on the secondary side is as follows.

[0059] ; .

[0060] in, This is the rated voltage of the secondary winding of the series transformer. This is the rated voltage of the secondary winding of the first parallel transformer. This is the rated voltage of the secondary winding of the second parallel transformer. This is the rated voltage of the secondary winding of the third parallel transformer.

[0061] S1033. Based on the rated current and phase shift angle of the controllable phase shifter, and the maximum voltage stress borne by each winding, calculate the rated current of each winding.

[0062] For example, step S1033 can be specifically implemented as steps B1-B4. B1. The rated current of the controllable phase shifter is the rated current of the primary winding of the series transformer.

[0063] B2. With the phase shift angle as 0, calculate the rated current of the secondary winding of the series transformer based on the rated current of the controllable phase shifter and the turns ratio of the series transformer.

[0064] B3. Using the maximum phase shift angle, calculate the rated current of the primary winding of the parallel transformer based on the rated current of the controllable phase shifter.

[0065] B4. Based on the rated current of the primary winding of the parallel transformer and the turns ratio of the parallel transformer, calculate the rated current of the secondary winding of the parallel transformer.

[0066] like Figure 4 As shown in the diagram, this embodiment of the invention provides a schematic diagram of the relationship between the current phasors and the phase shift angle of a dual-core symmetrical controllable phase shifter. This embodiment of the invention can be based on the overall rated current of the aforementioned phase shifter. Calculate the rated current of each winding based on the maximum current stress encountered during operation. (Series transformer primary winding) , Directly connected in series with transmission lines, the maximum current stress is the rated current. secondary winding of series transformer The current stress is greatest when the phase shift angle of the dual-core symmetrical controllable phase shifter reaches 0; the primary winding of the parallel transformer The current stress is greatest when the dual-core symmetrical controllable phase shifter is at its maximum phase shift angle; the rated current on the secondary side is calculated using the turns ratio. , , .

[0067] ; ; ; .

[0068] in, This is the rated current of the primary winding of the first series transformer. This is the rated current of the primary winding of the second series transformer. This refers to the rated current of the secondary winding of the series transformer. This refers to the rated current of the primary winding of the parallel transformer. This is the rated current of the secondary winding of the first parallel transformer. This is the rated current of the secondary winding of the second parallel transformer; This is the rated current of the secondary winding of the third parallel transformer.

[0069] S1034. Calculate the rated capacity of series transformers and parallel transformers based on the rated capacity of the controllable phase shifter.

[0070] For example, embodiments of the present invention can calculate the rated capacity of a series transformer based on the rated voltage and rated current of the series transformer and the rated capacity of the controllable phase shifter.

[0071] For example, embodiments of the present invention can calculate the rated capacity of a parallel transformer based on the rated voltage and rated current of the parallel transformer and the rated capacity of the controllable phase shifter.

[0072] For example, embodiments of the present invention can calculate the rated capacity of the series transformer and the parallel transformer based on the rated voltage and rated current of the series transformer and the parallel transformer calculated above, and the overall rated capacity.

[0073] ; .

[0074] in, This refers to the rated capacity of the series transformer; This refers to the rated capacity of the parallel transformer.

[0075] S104. Based on key performance indicators and core component parameters, generate a parameter design scheme for the controllable phase shifter.

[0076] This invention provides a parameter design method for a dual-core symmetrical controllable phase shifter. First, based on system design requirements and constraints, key performance indicators such as the phase shift angle, rated capacity, rated voltage, rated current, and short-circuit impedance range of the controllable phase shifter are determined. Then, based on these key performance indicators, precise calculations are performed to determine the rated turns ratio of the series and parallel transformers of the controllable phase shifter, as well as the rated voltage, rated current, and rated capacity of each winding and other core component parameters. This realizes a hierarchical parameter design approach, starting with the overall system and then moving to individual components. By determining the overall performance indicators of the phase shifter from the perspective of the overall power system requirements, the design objectives are highly consistent with system requirements, avoiding the problem of disconnection from overall operating conditions that may result from directly designing individual components. This helps to achieve optimal overall performance, solves the problem of unreasonable traditional parameter design methods for controllable phase shifters, and improves the rationality of controllable phase shifter parameter design.

[0077] Furthermore, in designing the parameters of core components, this invention fully utilizes the precise electrical model and mathematical relationships of the dual-core symmetrical phase shifter, and takes into account key constraints in actual operation (such as maximum voltage / current stress conditions, line P / Q transmission limits, loss limitations, short-circuit withstand, etc.), avoiding oversimplification or assumption biases that may exist in existing technologies. Therefore, the calculated turns ratio, rated voltage, rated current, rated capacity, and other parameters are more accurate and reliable, improving the safety margin and operational reliability of the equipment.

[0078] This invention provides a complete, clear, and logically sound parameter design process. In particular, it systematically presents methods for determining key parameters such as the phase shift angle, overall rated capacity, and overall short-circuit impedance range of the phase shifter, filling gaps or deficiencies in existing technologies in these areas and making the design process more standardized and evidence-based. It emphasizes the synergistic determination relationship between overall parameters and component parameters; that is, the design of component parameters is based on the determined overall parameters, ensuring the mutual matching between internal component parameters and consistency with overall performance indicators. This invention is logically clear, with well-defined steps, making it easy for engineers to understand and implement, reducing over-reliance on design experience and improving design efficiency and accuracy. It has significant practical value and guiding significance for the research, development, manufacturing, and engineering application of dual-core symmetrical controllable phase shifters.

[0079] For example, Figure 5 This invention provides an equivalent circuit diagram of phase A of a dual-core symmetrical controllable phase shifter. Figure 6 This invention provides a schematic diagram of the system structure of a ring network power system. Due to differences in line impedance, the natural power flow distribution in the system is uneven, with only a small portion of the transmission capacity of lines 2-4 being utilized. Therefore, it is considered to install a dual-core symmetrical controllable phase shifter (TCSD-TCPST) near node 2 between nodes 2 and 4 to improve the power transmission capacity of line 2-4.

[0080] Based on the above parameter design method, a parameter configuration scheme for a dual-core symmetrical controllable phase shifter is formulated. The specific parameter values ​​are detailed in Table 1.

[0081] Table 1

[0082] Figure 7 This is a schematic diagram showing the change in active power after the connection of a dual-core symmetrical controllable phase shifter. The transmission power capacity of lines 2-4 is increased from 94.62 MW to 273 MW. During the operation of TCSD-TCPST, the maximum voltage at both ends is 214 kV and the maximum current is 0.85 kA. The calculated transmission capacity is 303 MVA, thus confirming the feasibility of the overall parameter design scheme.

[0083] Figure 8 This is a schematic diagram comparing the input and output voltages of phase A of a dual-core symmetrical controllable phase shifter. Calculations show that the simulated phase shift angle is... When the dual-core symmetrical controllable phase shifter is adjusted in advance, the phase shift angle will be slightly smaller than the rated phase shift angle due to the influence of its own equivalent impedance. Therefore, the simulation results are basically consistent with the theoretical values, thus verifying the correctness of the turns ratio parameters.

[0084] The voltage and current flowing through each winding of the series and parallel transformers vary with the tap position. Table 2 shows the maximum voltage and current values ​​flowing through each winding during operation. It can be seen that the voltage and current of all windings did not exceed their rated values ​​during operation, and calculations show that the capacity also did not exceed their rated values. Therefore, the parameter settings for the series transformer and the excitation transformer are reasonable.

[0085] Table 2

[0086] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0087] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0088] Figure 9 A schematic diagram of a parameter design device for a dual-core symmetrical controllable phase shifter provided in an embodiment of the present invention is shown. The parameter design device 200 includes a communication module 201 and a processing module 202.

[0089] The communication module 201 is used to obtain the system design requirements and constraints of the controllable phase shifter.

[0090] The processing module 202 is used to determine the key performance indicators of the controllable phase shifter based on system design requirements and constraints. The key performance indicators include phase shift angle, rated capacity, rated voltage, rated current, and short-circuit impedance range. Based on the internal topology of the controllable phase shifter and the key performance indicators, it performs precise calculations to determine the core component parameters of the controllable phase shifter. The core component parameters include the rated turns ratio of the series transformer and the parallel transformer, as well as the rated voltage, rated current, and rated capacity of each winding. Based on the key performance indicators and core component parameters, it generates a parameter design scheme for the controllable phase shifter.

[0091] Figure 10This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. The electronic device 300 includes: a processor 301, a memory 302, and a computer program 303 stored in the memory 302 and executable on the processor 301. When the processor 301 executes the computer program 303, it implements the steps in the above-described method embodiments. Alternatively, when the processor 301 executes the computer program 303, it implements the functions of each module / unit in the above-described device embodiments.

[0092] For example, the computer program 303 may be divided into one or more modules / units, which are stored in the memory 302 and executed by the processor 301 to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 303 in the electronic device 300.

[0093] The processor 301 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. A general-purpose processor may be a microprocessor or any conventional processor.

[0094] The memory 302 can be an internal storage unit of the electronic device 300, such as a hard disk or memory of the electronic device 300. The memory 302 can also be an external storage device of the electronic device 300, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the electronic device 300. Furthermore, the memory 302 can include both internal and external storage units of the electronic device 300. The memory 302 is used to store the computer program and other programs and data required by the terminal. The memory 302 can also be used to temporarily store data that has been output or will be output.

[0095] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A parameter design method for a dual-core symmetrical controllable phase shifter, characterized in that, include: Obtain the system design requirements and constraints for the controllable phase shifter; Based on the system design requirements and constraints, the key performance indicators of the controllable phase shifter are determined. These key performance indicators include phase shift angle, rated capacity, rated voltage, rated current, and short-circuit impedance range. Based on the internal topology of the controllable phase shifter and the key performance indicators, precise calculations are performed to determine the core component parameters of the controllable phase shifter. The core component parameters include the rated turns ratio of the series transformer and the parallel transformer, as well as the rated voltage, rated current and rated capacity of each winding. Based on the key performance indicators and the parameters of the core components, a parameter design scheme for the controllable phase shifter is generated.

2. The parameter design method for the dual-core symmetrical controllable phase shifter according to claim 1, characterized in that, The system design requirements include: active power regulation requirements, system rated voltage, system rated current, minimum short-circuit current withstand capability, and maximum allowable power loss; the constraints include: line reactive power constraints, active power upper limit constraints, and safety margin constraints. Based on the system design requirements and constraints, the key performance indicators of the controllable phase shifter are determined, including: Based on the active power adjustment requirements, line reactive power constraints, and active power upper limit constraints, the maximum transmission power is solved to determine the phase shift angle. Based on the system's rated voltage and rated current, determine the preliminary rated capacity; Based on the cost and benefits of each level of the rated capacity of the controllable phase shifter, the initial rated capacity is revised to determine the rated capacity of the controllable phase shifter; The rated voltage of the controllable phase shifter is determined by the system rated voltage level of the transmission line. Determine the rated current of the controllable phase shifter based on its rated voltage and rated capacity. Based on the maximum permissible power loss and minimum short-circuit current withstand capability, the short-circuit impedance range is determined, which includes an upper limit and a lower limit of the short-circuit impedance.

3. The parameter design method for the dual-core symmetrical controllable phase shifter according to claim 2, characterized in that, The determination of the short-circuit impedance range based on the maximum permissible power loss and minimum short-circuit current withstand capability includes: Calculate the upper limit of short-circuit impedance based on the maximum allowable power loss; Based on the minimum short-circuit current withstand capability, the lower limit of the short-circuit impedance is calculated.

4. The parameter design method for the dual-core symmetrical controllable phase shifter according to claim 2, characterized in that, The process of revising the initial rated capacity based on the cost and benefits of each stage of the rated capacity of the controllable phase shifter to determine the rated capacity of the controllable phase shifter includes: Based on the cost and benefits of each rated capacity of the controllable phase shifter, a total revenue function is constructed. Based on the total revenue function and the constraints of the rated capacity of the controllable phase shifter, the initial rated capacity is corrected to determine the rated capacity of the controllable phase shifter.

5. The parameter design method for the dual-core symmetrical controllable phase shifter according to claim 1, characterized in that, Based on the internal topology of the controllable phase shifter and the key performance indicators, precise calculations are performed to determine the core component parameters of the controllable phase shifter, including: Based on the rated current and phase shift angle of the controllable phase shifter, and the internal topology, calculate the turns ratio of the series transformer and the turns ratio of the parallel transformer; Calculate the rated voltage of each winding based on the rated voltage and phase shift angle of the controllable phase shifter, as well as the maximum voltage stress borne by each winding; Calculate the rated current of each winding based on the rated current and phase shift angle of the controllable phase shifter, as well as the maximum voltage stress borne by each winding; Calculate the rated capacity of series transformers and parallel transformers based on the rated capacity of the controllable phase shifter.

6. The parameter design method for the dual-core symmetrical controllable phase shifter according to claim 4, characterized in that, The calculation of the rated voltage of each winding based on the rated voltage and phase shift angle of the controllable phase shifter, and the maximum voltage stress borne by each winding, includes: Taking the maximum value of the phase shift angle, and based on the rated voltage of the controllable phase shifter, calculate the rated voltage of the primary winding of the series transformer; With a phase shift angle of 0, calculate the rated voltage of the primary winding of the parallel transformer based on the rated voltage of the controllable phase shifter; Calculate the rated voltage of the secondary winding of the series transformer based on the turns ratio and the rated voltage of the primary winding of the series transformer. Calculate the rated voltage of the secondary winding of the parallel transformer based on the transformer turns ratio and the rated voltage of the primary winding of the parallel transformer.

7. The parameter design method for the dual-core symmetrical controllable phase shifter according to claim 4, characterized in that, The calculation of the rated current of each winding based on the rated current and phase shift angle of the controllable phase shifter, and the maximum voltage stress borne by each winding, includes: The rated current of the controllable phase shifter is taken as the rated current of the primary winding of the series transformer. With a phase shift angle of 0, the rated current of the secondary winding of the series transformer is calculated based on the rated current of the controllable phase shifter and the turns ratio of the series transformer. Calculate the rated current of the primary winding of the parallel transformer based on the rated current of the controllable phase shifter, taking the phase shift angle as the maximum. Calculate the rated current of the secondary winding of the parallel transformer based on the rated current of the primary winding and the turns ratio of the parallel transformer.

8. The parameter design method for the dual-core symmetrical controllable phase shifter according to claim 4, characterized in that, The calculation of the rated capacity of series transformers and parallel transformers based on the rated capacity of the controllable phase shifter includes: Calculate the rated capacity of the series transformer based on its rated voltage and rated current, and the rated capacity of the controllable phase shifter. Calculate the rated capacity of the parallel transformer based on its rated voltage and rated current, as well as the rated capacity of the controllable phase shifter.

9. A parameter design device for a dual-core symmetrical controllable phase shifter, characterized in that, include: The communication module is used to obtain the system design requirements and constraints of the controllable phase shifter; The processing module is used to determine the key performance indicators of the controllable phase shifter based on the system design requirements and constraints. The key performance indicators include phase shift angle, rated capacity, rated voltage, rated current, and short-circuit impedance range. Based on the internal topology of the controllable phase shifter and the key performance indicators, it performs precise calculations to determine the core component parameters of the controllable phase shifter. The core component parameters include the rated turns ratio of the series transformer and the parallel transformer, as well as the rated voltage, rated current, and rated capacity of each winding. Based on the key performance indicators and the core component parameters, it generates a parameter design scheme for the controllable phase shifter.

10. The parameter design device for the dual-core symmetrical controllable phase shifter according to claim 9, characterized in that, The processing module is specifically used to solve for the maximum transmission power and determine the phase shift angle based on the active power adjustment requirements, line reactive power constraints, and active power upper limit constraints. Based on the system's rated voltage and rated current, determine the preliminary rated capacity; Based on the cost and benefits of each level of the rated capacity of the controllable phase shifter, the initial rated capacity is revised to determine the rated capacity of the controllable phase shifter; The rated voltage of the controllable phase shifter is determined by the system rated voltage level of the transmission line. Determine the rated current of the controllable phase shifter based on its rated voltage and rated capacity. Based on the maximum permissible power loss and minimum short-circuit current withstand capability, the short-circuit impedance range is determined, which includes an upper limit and a lower limit of the short-circuit impedance.

Images