Configuration method of multiple types of flexible alternating current transmission devices and terminal equipment

Abstract

This invention relates to the field of power electronics technology and provides a configuration method and terminal equipment for multiple types of flexible AC transmission devices. The method includes: acquiring the operating parameters of the power system; establishing equivalent models for each type of flexible AC transmission device; determining the objective function and constraints based on the operating parameters of the power system and the equivalent models of the various flexible AC transmission devices, and establishing an optimal configuration model for multiple types of flexible AC transmission devices based on the objective function and constraints; solving the optimal configuration model for multiple types of flexible AC transmission devices to obtain a joint configuration scheme for the various types of flexible AC transmission devices. This invention establishes an optimal configuration model for multiple types of flexible AC transmission devices and solves the model comprehensively, which can simultaneously obtain the configuration parameters of multiple types of flexible AC transmission devices. The method is simple and effective.

Description

Technical Field

[0001] This invention belongs to the field of power electronics technology, and in particular relates to a configuration method and terminal equipment for various types of flexible AC transmission devices. Background Technology

[0002] With the large-scale integration of new energy sources and the substantial growth of dynamic electricity load, the transmission characteristics of modern power systems have become increasingly complex. Flexible Alternative Current Transmission Systems (FACTS), as a new technology that integrates power electronics, microprocessor and microelectronics, communication, and control technologies for flexible and rapid control of AC transmission, has been widely used in power systems. Currently, FACTS devices mainly include three types: parallel FACTS devices, series FACTS devices, and integrated FACTS devices.

[0003] In the existing technology, power systems are often equipped with various types of flexible AC transmission devices, but the configuration methods for flexible AC transmission devices are mostly for a single type, and there is a lack of methods for the joint configuration of multiple types of AC transmission devices. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a configuration method and terminal equipment for multiple types of flexible AC transmission devices, in order to solve the problem that the configuration of AC transmission devices in the prior art is mostly for a single type and lacks joint configuration of multiple types of AC transmission devices.

[0005] A first aspect of this invention provides a method for configuring various types of flexible AC transmission devices, including:

[0006] Obtain the operating parameters of the power system;

[0007] Equivalent models of various flexible AC transmission devices were established respectively;

[0008] Based on the operating parameters of the voltage ratio power system and the equivalent models of various flexible AC transmission devices with different voltage ratios, the objective function and constraints are determined, and optimization configuration models for multiple types of flexible AC transmission devices are established based on the voltage ratio objective function and voltage ratio constraints.

[0009] The optimal configuration model of various types of flexible AC transmission devices with different voltage ratios is solved to obtain a joint configuration scheme for various types of flexible AC transmission devices.

[0010] A second aspect of the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the configuration method for multiple types of flexible AC transmission devices provided in the first aspect of the present invention.

[0011] A third aspect of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the configuration method for multiple types of flexible AC transmission devices provided in the first aspect of the present invention.

[0012] This invention provides a method for configuring multiple types of flexible AC transmission devices, including: acquiring power system operating parameters; establishing equivalent models for each type of flexible AC transmission device; determining objective functions and constraints based on the power system operating parameters and the equivalent models of each type of flexible AC transmission device, and establishing an optimal configuration model for multiple types of flexible AC transmission devices based on the objective functions and constraints; solving the optimal configuration model for multiple types of flexible AC transmission devices to obtain a joint configuration scheme for multiple types of flexible AC transmission devices. This invention establishes an optimal configuration model for multiple types of flexible AC transmission devices and solves the model comprehensively, which can simultaneously obtain the configuration parameters of multiple types of flexible AC transmission devices. The method is simple and effective. Attached Figure Description

[0013] 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.

[0014] Figure 1 This is a schematic diagram illustrating the implementation process of the configuration method for various types of flexible AC power transmission devices provided in the embodiments of the present invention;

[0015] Figure 2 This is an equivalent model diagram of the static var flexible device provided in the embodiments of the present invention;

[0016] Figure 3 This is an equivalent model diagram of the controllable series withstand provided in the embodiments of the present invention;

[0017] Figure 4 This is an equivalent model diagram of a thyristor-controlled phase-shifting transformer provided in an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the configuration system of various types of flexible AC power transmission devices provided in the embodiments of the present invention;

[0019] Figure 6 This is a schematic diagram of a terminal device provided in an embodiment of the present invention. Detailed Implementation

[0020] 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.

[0021] To illustrate the technical solution of the voltage transformation ratio of the present invention, specific embodiments are described below.

[0022] In existing technologies, the configuration methods for flexible AC transmission devices in power systems are mostly tailored to a single type. For power systems containing multiple types of AC transmission devices, each type needs to be configured separately, resulting in complex configuration methods. This invention establishes equivalent models for various types of flexible AC transmission devices (static reactive power flexible devices, thyristor-controlled phase-shifting transformers, and controllable series reactance). Based on the equivalent models of these devices and the operating parameters of the power system, and considering both steady-state optimization (active power balance, node voltage deviation, and cross-sectional power transmission margin) and cost optimization (configuration economic cost), objective functions and constraints are established. Based on these objective functions and constraints, optimization configuration models for multiple types of flexible AC transmission devices are established and solved. This allows for the simultaneous acquisition of configuration parameters for various types of flexible AC transmission devices, making the process simple and effective.

[0023] refer to Figure 1 This invention provides a configuration method for various types of flexible AC transmission devices, including:

[0024] S101: Obtain operating parameters of the power system;

[0025] S102: Establish equivalent models for various types of flexible AC transmission devices;

[0026] S103: Based on the operating parameters of the voltage ratio power system and the equivalent models of various flexible AC transmission devices with voltage ratios, determine the objective function and constraints, and establish optimization configuration models for multiple types of flexible AC transmission devices based on the voltage ratio objective function and voltage ratio constraints.

[0027] S104: Solve the optimization configuration model of multiple types of flexible AC transmission devices with different voltage ratios to obtain the joint configuration scheme of multiple types of flexible AC transmission devices.

[0028] This invention comprehensively considers various types of flexible AC transmission devices, establishes an optimized configuration model for multiple types of flexible AC transmission devices, and uses artificial intelligence algorithms to comprehensively solve the model, which can simultaneously obtain the configuration parameters of multiple types of flexible AC transmission devices, making it simple and effective. Furthermore, by comprehensively considering multiple types of flexible AC output devices, the parameter configuration is more accurate.

[0029] In some embodiments, S102 may include:

[0030] S1021: Based on the operating parameters of the voltage ratio power system and the equivalent models of various flexible AC transmission devices with voltage ratios, determine multiple performance evaluation indicators of the power system.

[0031] S1022: Normalize multiple performance evaluation indicators of voltage ratio to obtain multiple normalized performance evaluation indicators.

[0032] S1023: Determine the objective function of the voltage turns ratio based on multiple normalized performance evaluation indicators of the voltage turns ratio.

[0033] In some embodiments, the voltage-ratio multi-type flexible AC transmission device includes: a static var converter, a thyristor-controlled phase-shifting transformer, and a controllable series reactor; the combined configuration scheme of the voltage-ratio multi-type flexible AC transmission device includes:

[0034] Configuration parameters of the voltage transformation static var flexible device: reactive power injected by the static var flexible device, and state variables of the static var flexible device;

[0035] Configuration parameters of voltage ratio thyristor-controlled phase-shifting transformer: capacity of the thyristor-controlled phase-shifting transformer, ideal phase-shifting angle of the thyristor-controlled phase-shifting transformer, voltage ratio, internal reactance of the thyristor-controlled phase-shifting transformer, and state variables of the thyristor-controlled phase-shifting transformer;

[0036] Configuration parameters for voltage-ratio controllable series reactance: configure the equivalent reactance of the controllable series reactance, and configure the state variables of the controllable series reactance.

[0037] There are three main types of flexible AC transmission equipment:

[0038] Parallel-connected static var compensators (FACTS) include: static var compensators (SVC), static var generators (SVG), static synchronous compensators (STATCOM), etc. These FACTS devices aim to control line voltage or control devices to absorb / transmit reactive power.

[0039] Series-type FACTS devices include: thyristor-controlled series capacitors (TCSC), thyristor-controlled series reactors (TCSR), static synchronous series compensators (SSSC), etc. These FACTS devices aim to control line reactance, thereby controlling the current and active power transmitted by the line. Among them, TCSC and TCSR are devices that can realize continuous capacitive reactance regulation and continuous inductive reactance regulation, respectively.

[0040] The integrated FACTS device includes a Unified Power Flow Controller (UPFC) and a Thyristor Controlled Phase Shifter (TCPST), which can comprehensively control the transmission power and line voltage of the line.

[0041] Considering economic efficiency and practicality, the FACTS devices with high economic value currently include: parallel-type devices such as SVC, SVG, and STATCOM; series-type devices such as TCSC and TCSR; and integrated devices such as TCPST. Since TCSC and TCSR have the same model and similar functions, these two devices are considered as one type of FACTS device, collectively referred to as controllable series reactance. Similarly, since SVC, SVG, and STATCOM have the same model and similar functions, these three devices are considered as one type of FACTS device, collectively referred to as static var flexible transformers. Therefore, the FACTS devices in this embodiment of the invention include three types: parallel-type static var flexible transformers (SVC, SVG, and STATCOM, a total of 3 forms), series-type controllable series reactances (TCSC and TCSR, a total of 2 forms), and integrated thyristor-controlled phase-shifting transformers.

[0042] (1) Static var flexible device

[0043] SVC, SVG, and STATCOM all regulate the voltage of parallel nodes by controlling the amount of reactive power output or absorption. Although their internal principles, reactive power output phase angles, and costs differ, they are treated as the same device because their equivalent models are the same, and are collectively referred to as "static var flexible devices." In applications, since the same type of "static var flexible device" is usually selected within a power system, the type of static var flexible device can be determined first, and then the configuration method provided in this embodiment can be applied based on the economic cost of that type of static var flexible device.

[0044] refer to Figure 2 An equivalent model of the static var flexible device (SVT) is established, representing the form of the reactive power source. The equivalent model shows that the configuration parameters of the SVT include: the reactive power injected by the SVT and the state variables of the configured SVT. That is, Represents a node Configure the state variables of the static var flexible device. Represents a node Equipped with a static var flexible device, Represents a node No static var flexible device was configured. Represents a node The reactive power injected by the static reactive power flexible device at the node, if the node No static var flexible device was configured. .

[0045] (2) Controllable series impedance

[0046] Both TCSC and TCSR regulate power flow by changing line reactance. Although the former is a capacitive reactance and the latter is an inductive reactance, they are treated as the same device because their equivalent models are the same, and are collectively referred to as "controllable series reactance".

[0047] refer to Figure 3 The equivalent model of the controllable series reactance is determined, that is, the form of a single reactance connected in series in the line. From the equivalent model, it can be seen that the configuration parameters of the controllable series reactance include: the equivalent reactance of the controllable series reactance and the state variables of the controllable series reactance. That is, Indicates on the line Configure controllable serial impedance state variables on the top. Indicates the line It is equipped with a controllable series reactor. Indicates the line The system is not configured with a controllable series reactor. Indicates on the line The equivalent reactance of the controllable series reactance is configured on the line. No controllable reactor is configured on it. ; When the signal is positive, the line is equipped with a TCSR. When the value is negative, the line is configured with TCSC. Indicates the line The line impedance.

[0048] (3) Thyristor-controlled phase-shifting transformer

[0049] refer to Figure 4The equivalent model of TCPST is determined, which is the series connection of the ideal phase shifter and the internal reactance. From the equivalent model, the configuration parameters of the thyristor-controlled phase shifter transformer include: the capacity of the thyristor-controlled phase shifter transformer, the ideal phase shift angle, the voltage ratio, the internal reactance, and the state variables. That is, Represents a node Configure TCPST state variables, Represents a node TCPST is configured. Represents a node TCPST is not configured; Indicates on the line Configure TCPST status variables on the top. Indicates the line TCPST is configured on top. Indicates the line TCPST is not configured. , Representative Line nodes If TCPST is configured on the side, then the node must satisfy the condition. For the line One of the two ends, otherwise it means that TCPST is not configured at the corresponding position. Indicates the line Configure the ideal phase shift angle of TCPST on the line (regardless of the line) (Which side of the node configuration), if the line TCPST is not configured. ; Indicates on the line Configure TCPST's internal reactor (regardless of the line) (Which side of the node configuration), if the line No controllable reactor is configured on it. . For the line Configure TCPST capacity on the line (regardless of the line) (Which side of the node configuration), if the line TCPST is not configured. . This indicates the voltage transformation ratio configured with TCPST on the line. If the line TCPST or line not configured When a phase shifter with the same voltage amplitude is configured on top, .

[0050] Based on the voltage transformation ratios, the configuration parameters of various flexible AC transmission devices are shown in Table 1.

[0051] Table 1 Configuration parameters of various flexible AC transmission devices

[0052]

[0053] In some embodiments, multiple performance evaluation indicators for voltage turns ratio may include: active power balance, node voltage deviation, cross-sectional power transmission margin, and configuration economic cost.

[0054] In some embodiments, the formula for calculating the voltage turns ratio objective function can be:

[0055]

[0056]

[0057] in, For normalized active power balance, Normalized node voltage deviation For normalized cross-sectional power transfer margin, Normalized allocation economic cost; , , and These are the weighting coefficients corresponding to each normalized performance evaluation index.

[0058] Since the main configuration objective of flexible AC transmission equipment is the steady-state optimization of the power system, namely optimizing power flow distribution, eliminating fault-mode overload, optimizing static voltage, and improving power transmission capacity, while economic efficiency is also an important configuration objective, this embodiment of the invention comprehensively considers four performance evaluation indicators: active power balance, node voltage deviation, cross-sectional power transmission margin, and configuration economic cost. The objective function is obtained from these four performance evaluation indicators, which can yield a comprehensive optimized configuration scheme with multiple types and multiple objectives.

[0059] In some embodiments, It can be 0.3. It can be 0.2. It can be 0.2. It can be 0.3.

[0060] The corresponding weighting coefficients can be determined based on the objective parameter weighting method, or they can be determined subjectively based on the application scenario.

[0061] In some embodiments, various types of flexible AC transmission devices may include: static var flexible devices, thyristor-controlled phase-shifting transformers, and controllable series reactors;

[0062] Active power balance The calculation formula is:

[0063]

[0064] right Normalization is performed; normalized active power balance The calculation formula can be:

[0065]

[0066]

[0067] in, For the line active power, For the line Maximum power; , This represents the total number of lines in the power system. For the line The voltage amplitude at the first node, For the line The voltage amplitude at the tail node; For the line The voltage phase of the first node, For the line The voltage phase of the tail node; For the line Reactance, For the line The internal reactance of the phase-shifting transformer is configured with thyristors for control. For the line The equivalent reactance of the controllable series reactance is configured on top; For the line The state variables of the phase-shifting transformer are controlled by thyristors. Indicates the line It is equipped with a thyristor-controlled phase-shifting transformer. Indicates the line The phase-shifting transformer is not equipped with thyristor control. For the line Configure controllable serial impedance state variables on the top. Indicates the line It is equipped with a controllable series reactor. Indicates the line The upper part is not configured with a controllable series reactor; ; For the line The ideal phase shift angle of the phase-shifting transformer is configured with thyristors for control. Represents the mean;

[0068] refer to Figure 3Due to the line The line resistance is much smaller than the line reactance, that is... Therefore, the circuit is determined in the embodiments of the present invention. active power Ignore The impact.

[0069] If considered The impact on the line active power The calculation formula is:

[0070]

[0071]

[0072]

[0073] in, For the line The equivalent impedance after configuring a thyristor-controlled phase-shifting transformer and a controllable series reactance; For the line The line impedance.

[0074] Node voltage deviation The calculation formula is:

[0075]

[0076] right Normalization is performed; the normalized node voltage deviation The calculation formula can be:

[0077]

[0078]

[0079] in, For nodes voltage amplitude, For nodes The voltage phase; For nodes voltage amplitude, For nodes The voltage phase; For nodes Standard voltage value, , , The number of nodes; node The generator injects active power at the location. For nodes Reactive power injected into the generator at the location For nodes The load absorbs active power at the location. For nodes The load at the location absorbs reactive power. For nodes The reactive power injected by the static reactive flexible device at the location; and The node admittance matrices are calculated after considering the configuration of thyristor-controlled phase-shifting transformers and controllable series reactance for each line. The Middle Line 1 Elements in the column The real and imaginary parts, i.e. ; For nodes Configure the state variables of the static var flexible device. Represents a node Equipped with a static var flexible device, Represents a node No static var flexible device was configured;

[0080] When calculating using the per-unit value, . It can be obtained using the general calculation method for the nodal admittance matrix in traditional power systems, but in solving... At that time, the line needs to be The original impedance is replaced with its equivalent impedance, and the voltage transformation ratio of TCPST must be taken into account. ( At that time, it can be disregarded ).

[0081] Before the flexible AC transmission system is installed, the nodal admittance matrix can be determined based on the line. Line impedance Once the equipment parameters in the power system are determined, the node admittance matrix after configuring thyristor-controlled phase-shifting transformers and controllable series reactances is determined. Then it is necessary to Replace with line Equivalent impedance after configuring thyristor-controlled phase-shifting transformer and controllable series reactance Later determined; among them, , .

[0082] Cross-sectional power transfer margin The calculation formula is:

[0083]

[0084] right Normalization is performed; the normalized cross-sectional power transfer margin The calculation formula can be:

[0085]

[0086] in, It is the set of all transmission sections in a power system. For the first The set of all lines in a transmission section; , For set The number of elements in the middle;

[0087] Configuration economic cost The calculation formula is:

[0088]

[0089] right Normalization is performed, and the normalized allocation economic cost is calculated. The calculation formula can be:

[0090]

[0091] in, The cost of installing a unit capacity of static var flexible generator (SVM), The cost of installing a thyristor-controlled phase-shifting transformer per unit capacity, The cost of installing a controllable series reactor per unit capacity; To set the upper limit of the total cost budget for configuring thyristor-controlled phase-shifting transformers, The total active power loss of the power system before configuring the thyristor-controlled phase-shifting transformer; For the line The capacity of the phase-shifting transformer is controlled by thyristors. To consider the node admittance matrix after configuring thyristor-controlled phase-shifting transformers and controllable series reactance for each line. The Middle Line 1 The real part of the elements in the column.

[0092] in, It can be determined based on the type of static var flexible device (SVC, SVG, or STATCOOM).

[0093] In some embodiments, voltage ratio constraints may include: operating power flow relationship constraints, steady-state operating state constraints, fault mode state constraints, thyristor-controlled phase-shifting transformer configuration constraints, and thyristor-controlled phase-shifting transformer configuration techno-economic constraints.

[0094] In some embodiments, the power flow relationship constraints may include:

[0095]

[0096] in, node The generator injects active power at the location. For nodes Reactive power injected into the generator at the location For nodes The load absorbs active power at the location. For nodes The load at the location absorbs reactive power. For nodes The reactive power injected by the static reactive flexible device at the location; For nodes voltage amplitude, For nodes The voltage phase; For nodes voltage amplitude, For nodes The voltage phase; , , The number of nodes; and The node admittance matrices are calculated after considering the configuration of thyristor-controlled phase-shifting transformers and controllable series reactance for each line. The Middle Line 1 Elements in the column The real and imaginary parts, i.e. ; For nodes Configure the state variables of the static var flexible device. Represents a node Equipped with a static var flexible device, Represents a node No static var flexible device was configured; For the line The active power; For the line The voltage amplitude at the first node, For the line The voltage amplitude at the tail node; For the line The voltage phase of the first node, For the line The voltage phase of the tail node; For the line Reactance, For the line The internal reactance of the phase-shifting transformer is configured with thyristors for control. For the line The equivalent reactance of the controllable series reactance is configured on top; For the line The state variables of the phase-shifting transformer are controlled by thyristors. Indicates the line It is equipped with a thyristor-controlled phase-shifting transformer. Indicates the line The phase-shifting transformer is not equipped with thyristor control. For the line Configure controllable serial impedance state variables on the top. Indicates the line It is equipped with a controllable series reactor. Indicates the line The upper part is not configured with a controllable series reactor; ; For the line The ideal phase shift angle of the phase-shifting transformer is configured with thyristors for control.

[0097] This constraint is the requirement that the power, voltage, and other parameters of the power system must meet during steady-state operation after the installation of FACTS.

[0098] In some embodiments, steady-state operating constraints may include:

[0099]

[0100] For the line active power, For the line Maximum power; , This represents the total number of lines in the power system. For nodes voltage amplitude, and They are nodes The lower limit and upper limit of the voltage value; For nodes The generator injects active power at the location. and They are nodes The lower and upper limits of the active power injected by the generator at the location; For nodes The generator injects reactive power at the location. and They are nodes The lower and upper limits of reactive power injected by the generator at the location;

[0101] This constraint is the equipment limit constraint that the lines, nodes, and other operating states must meet during the steady-state operation of the power system after the FACTS device is installed.

[0102] In some embodiments, the fault mode state constraints may include:

[0103]

[0104] in, For the line After the line malfunctions active power, For the line After the node fails The voltage amplitude; This is the allowable voltage drop factor for the fault mode. ; and They are nodes The lower limit and upper limit of the voltage value; , The number of nodes; , , This represents the total number of lines in the power system.

[0105] In some embodiments, It can be 0.95.

[0106] This constraint is the equipment limit constraint that the operating status of lines, nodes, etc. should meet when operating under fault conditions after FACTS is installed.

[0107] In some embodiments, the configuration constraints for thyristor-controlled phase-shifting transformers may include:

[0108]

[0109] in, For the line The capacity of the phase-shifting transformer is controlled by thyristors. For the line The active power; Configure capacity margin for thyristor-controlled phase-shifting transformers. ; For nodes Configure the state variables of the static var flexible device. Represents a node Equipped with a static var flexible device, Represents a node No static var flexible device was configured; For nodes Configure thyristor control of the state variables of the phase-shifting transformer. Represents a node Equipped with a thyristor-controlled phase-shifting transformer, Represents a node The phase-shifting transformer was not configured with thyristor control. , The number of nodes; , This represents the total number of lines in the power system. For the line The state variables of the phase-shifting transformer are controlled by thyristors. Indicates the line It is equipped with a thyristor-controlled phase-shifting transformer. Indicates the line The phase-shifting transformer is not equipped with thyristor control. For the line Configure controllable serial impedance state variables on the top. Indicates the line It is equipped with a controllable series reactor. Indicates the line The upper part is not configured with a controllable series reactor; A collection of nodes and lines on which flexible AC transmission devices can be installed; For the line The first node, For the line The terminal node;

[0110] This constraint is a construction condition constraint for installing FACTS. For TCPST's device capacity constraints; , , and Installation location constraints for different FACTS; Indicates the line Only one of the controllable series reactor or thyristor-controlled phase-shifting transformers can be configured; both cannot be configured. It means that for any satisfying or time , must meet ; It means that for any satisfying time , must meet ; It means that for any satisfying time , must meet and .

[0111] In some embodiments, the TCPST capacity is designed to accommodate future load growth and load disturbances under fault conditions. It can be 1.5.

[0112] In some embodiments, the techno-economic constraints of configuring a voltage-ratio thyristor-controlled phase-shifting transformer may include:

[0113] in, The cost of installing a unit capacity of static var flexible generator (SVM), The cost of installing a thyristor-controlled phase-shifting transformer per unit capacity, The cost of installing a controllable series reactor per unit capacity; For the line The equivalent reactance of the controllable series reactance is configured on top; For nodes The reactive power injected by the static reactive flexible device at the location; To set the upper limit of the total cost budget for configuring thyristor-controlled phase-shifting transformers, The total active power loss of the power system before configuring the thyristor-controlled phase-shifting transformer; To account for the node admittance matrix after configuring thyristor-controlled phase-shifting transformers and controllable series reactance in each line. The Middle Line 1 The real part of each element in the column; For the line The voltage amplitude at the first node, For the line The voltage amplitude at the tail node; For the line The voltage phase of the first node, For the line The voltage phase of the tail node.

[0114] This constraint is a fundamental technical and economic requirement when installing FACTS. Due to economic cost constraints, Due to technological constraints.

[0115] 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.

[0116] refer to Figure 5 This invention also provides a configuration system for various types of flexible AC transmission devices, including:

[0117] Parameter acquisition module 21 is used to acquire the operating parameters of the power system;

[0118] Equivalent model establishment module 22 establishes equivalent models for various flexible AC transmission devices;

[0119] The optimization model establishment module 23 is used to determine the objective function and constraints based on the operating parameters of the voltage ratio power system and the equivalent models of various flexible AC transmission devices with voltage ratios, and to establish optimization configuration models for multiple types of flexible AC transmission devices based on the voltage ratio objective function and voltage ratio constraints.

[0120] The optimization solution module 24 is used to solve the optimization configuration model of multiple types of flexible AC transmission devices with different voltage ratios, and obtain the joint configuration scheme of multiple types of flexible AC transmission devices.

[0121] In some embodiments, the optimization model building module 23 may include:

[0122] The index determination unit 231 is used to determine multiple performance evaluation indicators of the power system based on the operating parameters of the voltage ratio power system and the equivalent models of various flexible AC transmission devices with voltage ratios.

[0123] Normalization unit 232 is used to normalize multiple performance evaluation indicators of voltage ratio respectively to obtain multiple normalized performance evaluation indicators.

[0124] The objective function determination unit 233 is used to determine the voltage ratio objective function based on multiple normalized performance evaluation indicators of the voltage ratio.

[0125] In some embodiments, multiple performance evaluation indicators for voltage turns ratio may include: active power balance, node voltage deviation, cross-sectional power transmission margin, and configuration economic cost.

[0126] In some embodiments, the formula for calculating the voltage turns ratio objective function can be:

[0127]

[0128]

[0129] in, For normalized active power balance, The normalized node voltage deviation, For normalized cross-sectional power transfer margin, The normalized economic cost of allocation; , , and These are the weighting coefficients corresponding to each normalized performance evaluation index.

[0130] In some embodiments, the voltage-ratio flexible AC transmission device may include: a static var converter, a thyristor-controlled phase-shifting transformer, and a controllable series reactance; and the active power balance is normalized by the voltage ratio. The calculation formula can be:

[0131]

[0132]

[0133] in, For the line active power, For the line Maximum power; , This represents the total number of lines in the power system. For the line The voltage amplitude at the first node, For the line The voltage amplitude at the tail node; For the line The voltage phase of the first node, For the line The voltage phase of the tail node; For the line Reactance, For the line The internal reactance of the phase-shifting transformer is configured with thyristors for control. For the line The equivalent reactance of the controllable series reactance is configured on top; For the line The state variables of the phase-shifting transformer are controlled by thyristors. Indicates the line It is equipped with a thyristor-controlled phase-shifting transformer. Indicates the line The phase-shifting transformer is not equipped with thyristor control. For the line Configure controllable serial impedance state variables on the top. Indicates the line It is equipped with a controllable series reactor. Indicates the line The upper part is not configured with a controllable series reactor; ; For the line The ideal phase shift angle of the phase-shifting transformer is configured with thyristors for control.

[0134] Voltage ratio normalized node voltage deviation The calculation formula can be:

[0135]

[0136]

[0137] in, For nodes voltage amplitude, For nodes The voltage phase; For nodes voltage amplitude, For nodes The voltage phase; For nodes Standard voltage value, , , The number of nodes; node The generator injects active power at the location. For nodes Reactive power injected into the generator at the location For nodes The load absorbs active power at the location. For nodes The load at the location absorbs reactive power. For nodes The reactive power injected by the static reactive flexible device at the location; and The node admittance matrices are calculated after considering the configuration of thyristor-controlled phase-shifting transformers and controllable series reactance for each line. The Middle Line 1 Elements in the column The real and imaginary parts, i.e. ; For nodes Configure the state variables of the static var flexible device. Represents a node Equipped with a static var flexible device, Represents a node No static var flexible device was configured;

[0138] Voltage ratio normalized section power transfer margin The calculation formula can be:

[0139]

[0140] in, It is the set of all transmission sections in a power system. For the first The set of all lines in a transmission section; , For set The number of elements in the middle;

[0141] Economic cost of voltage ratio normalization configuration The calculation formula can be:

[0142]

[0143] in, The cost of installing a unit capacity of static var flexible generator (SVM), The cost of installing a thyristor-controlled phase-shifting transformer per unit capacity, The cost of installing a controllable series reactor per unit capacity; To set the upper limit of the total cost budget for configuring thyristor-controlled phase-shifting transformers, The total active power loss of the power system before configuring the thyristor-controlled phase-shifting transformer; For the line The capacity of the phase-shifting transformer is controlled by thyristors. To consider the node admittance matrix after configuring thyristor-controlled phase-shifting transformers and controllable series reactance for each line. The Middle Line 1 The real part of the elements in the column.

[0144] In some embodiments, voltage ratio constraints may include: operating power flow relationship constraints, steady-state operating state constraints, fault mode state constraints, thyristor-controlled phase-shifting transformer configuration constraints, and thyristor-controlled phase-shifting transformer configuration techno-economic constraints.

[0145] In some embodiments, the configuration constraints for voltage ratio thyristor-controlled phase-shifting transformers may include:

[0146]

[0147] in, For the line The capacity of the phase-shifting transformer is controlled by thyristors. For the line The active power; Configure capacity margin for thyristor-controlled phase-shifting transformers. ; For nodes Configure the state variables of the static var flexible device. Represents a node Equipped with a static var flexible device, Represents a node No static var flexible device was configured; For nodes Configure thyristor control of the state variables of the phase-shifting transformer. Represents a node Equipped with a thyristor-controlled phase-shifting transformer, Represents a node The phase-shifting transformer was not configured with thyristor control. , The number of nodes; , This represents the total number of lines in the power system. For the line The state variables of the phase-shifting transformer are controlled by thyristors. Indicates the line It is equipped with a thyristor-controlled phase-shifting transformer. Indicates the line The phase-shifting transformer is not equipped with thyristor control. For the line Configure controllable serial impedance state variables on the top. Indicates the line It is equipped with a controllable series reactor. Indicates the line The upper part is not configured with a controllable series reactor; A collection of nodes and lines on which flexible AC transmission devices can be installed; For the line The first node, For the line The terminal node;

[0148] The technical and economic constraints of configuring voltage ratio thyristor-controlled phase-shifting transformers may include:

[0149]

[0150] in, The cost of installing a unit capacity of static var flexible generator (SVM), The cost of installing a thyristor-controlled phase-shifting transformer per unit capacity, The cost of installing a controllable series reactor per unit capacity; For the line The equivalent reactance of the controllable series reactance is configured on top; For nodes The reactive power injected by the static reactive flexible device at the location; To set the upper limit of the total cost budget for configuring thyristor-controlled phase-shifting transformers, The total active power loss of the power system before configuring the thyristor-controlled phase-shifting transformer; To consider the node admittance matrix after configuring thyristor-controlled phase-shifting transformers and controllable series reactance for each line. The Middle Line 1 The real part of the elements in the column; For the line The voltage amplitude at the first node, For the line The voltage amplitude at the tail node; For the line The voltage phase of the first node, For the line The voltage phase of the tail node.

[0151] In some embodiments, the voltage ratio multi-type flexible AC transmission device may include: a static var converter, a thyristor-controlled phase-shifting transformer, and a controllable series reactor; the combined configuration scheme of the voltage ratio multi-type flexible AC transmission device may include:

[0152] Configuration parameters of the voltage transformation static var flexible device: reactive power injected by the static var flexible device, and state variables of the static var flexible device;

[0153] Configuration parameters of voltage ratio thyristor-controlled phase-shifting transformer: capacity of the thyristor-controlled phase-shifting transformer, ideal phase-shifting angle of the thyristor-controlled phase-shifting transformer, voltage ratio, internal reactance of the thyristor-controlled phase-shifting transformer, and state variables of the thyristor-controlled phase-shifting transformer;

[0154] Configuration parameters for voltage-ratio controllable series reactance: configure the equivalent reactance of the controllable series reactance, and configure the state variables of the controllable series reactance.

[0155] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the voltage transformation terminal equipment can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above device can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0156] Figure 6 This is a schematic block diagram of a terminal device provided in an embodiment of the present invention. Figure 6As shown, the terminal device 4 in this embodiment includes: one or more processors 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processor 40. When the processor 40 executes the computer program 42, it implements the steps in the configuration method embodiments of the various types of flexible AC transmission devices described above, for example... Figure 1 Steps S101 to S104 are shown. Alternatively, when processor 40 executes computer program 42, it implements the functions of each module / unit in the above-described configuration system embodiment of various types of flexible AC transmission devices, for example... Figure 5 The functions of modules 21 to 24 are shown.

[0157] Exemplarily, computer program 42 can be divided into one or more modules / units, one or more of which are stored in memory 41 and executed by processor 40 to complete this application. One or more modules / units can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of computer program 42 in terminal device 4. For example, computer program 42 can be divided into parameter acquisition module 21, equivalent model establishment module 22, optimization model establishment module 23, and optimization solution module 24.

[0158] Parameter acquisition module 21 is used to acquire the operating parameters of the power system;

[0159] Equivalent model establishment module 22 establishes equivalent models for various flexible AC transmission devices;

[0160] The optimization model establishment module 23 is used to determine the objective function and constraints based on the operating parameters of the voltage ratio power system and the equivalent models of various flexible AC transmission devices with voltage ratios, and to establish optimization configuration models for multiple types of flexible AC transmission devices based on the voltage ratio objective function and voltage ratio constraints.

[0161] The optimization solution module 24 is used to solve the optimization configuration model of multiple types of flexible AC transmission devices with different voltage ratios, and obtain the joint configuration scheme of multiple types of flexible AC transmission devices.

[0162] Other modules or units will not be described in detail here.

[0163] Terminal device 4 includes, but is not limited to, processor 40 and memory 41. Those skilled in the art will understand that... Figure 6 This is merely an example of a terminal device and does not constitute a limitation on terminal device 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, terminal device 4 may also include input devices, output devices, network access devices, buses, etc.

[0164] The processor 40 can 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. The general-purpose processor can be a microprocessor or any conventional processor.

[0165] The memory 41 can be an internal storage unit of the terminal device, such as the hard drive or RAM of the terminal device. The memory 41 can also be an external storage device of the terminal device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory 41 can include both internal and external storage units of the terminal device. The memory 41 is used to store the computer program 42 and other programs and data required by the terminal device. The memory 41 can also be used to temporarily store data that has been output or will be output.

[0166] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0167] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0168] In the embodiments provided in this application, it should be understood that the disclosed terminal devices and methods can be implemented in other ways. For example, the terminal device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0169] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0170] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0171] If an integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0172] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 this application, and should all be included within the protection scope of this application.

Claims

1. A method for configuring multiple types of flexible AC transmission devices, characterized in that, include: Obtain the operating parameters of the power system; Equivalent models of various flexible AC transmission devices were established respectively; Based on the operating parameters of the power system and the equivalent models of various flexible AC transmission devices, the objective function and constraints are determined, and an optimization configuration model for multiple types of flexible AC transmission devices is established based on the objective function and the constraints. Solving the optimization configuration model of the various types of flexible AC transmission devices yields a joint configuration scheme for the various types of flexible AC transmission devices; The objective function is determined based on the operating parameters of the power system and the equivalent models of various flexible AC transmission devices, including: Based on the operating parameters of the power system and the equivalent models of various flexible AC transmission devices, multiple performance evaluation indicators of the power system are determined. The various performance evaluation indicators are normalized respectively to obtain multiple normalized performance evaluation indicators; The objective function is determined based on the multiple normalized performance evaluation metrics; The performance evaluation indicators include: active power balance, node voltage deviation, cross-sectional power transmission margin, and configuration economic cost. The formula for calculating the objective function is as follows: in, For normalized active power balance, The normalized node voltage deviation, For normalized cross-sectional power transfer margin, The normalized economic cost of allocation; , , and These are the weighting coefficients corresponding to each normalized performance evaluation index.

2. The configuration method of multiple types of flexible AC transmission devices as described in claim 1, characterized in that, The various types of flexible AC transmission devices include: static var flexible devices, thyristor-controlled phase-shifting transformers, and controllable series reactance; the normalized active power balance... The calculation formula is: in, For the line active power, For the line Maximum power; , This represents the total number of lines in the power system. For the line The voltage amplitude at the first node, For the line The voltage amplitude at the tail node; For the line The voltage phase of the first node, For the line The voltage phase of the tail node; For the line Reactance, For the line The internal reactance of the phase-shifting transformer is configured with thyristors for control. For the line The equivalent reactance of the controllable series reactance is configured on top; For the line The state variables of the phase-shifting transformer are controlled by thyristors. Indicates the line It is equipped with a thyristor-controlled phase-shifting transformer. Indicates the line The phase-shifting transformer is not equipped with thyristor control. For the line Configure controllable serial impedance state variables on the top. Indicates the line It is equipped with a controllable series reactor. Indicates the line The upper part is not configured with a controllable series reactor; ; For the line The ideal phase shift angle of the phase-shifting transformer is configured with thyristors for control. The normalized node voltage deviation The calculation formula is: in, For nodes voltage amplitude, For nodes The voltage phase; For nodes voltage amplitude, For nodes The voltage phase; For nodes Standard voltage value; , The number of nodes; node The generator injects active power at the location. For nodes Reactive power injected into the generator at the location For nodes The load absorbs active power at the location. For nodes The load at the location absorbs reactive power. For nodes The reactive power injected by the static reactive flexible device at the location; and The node admittance matrices are calculated after considering the configuration of thyristor-controlled phase-shifting transformers and controllable series reactance for each line. The Middle Line 1 Elements in the column The real and imaginary parts, i.e. ; For nodes Configure the state variables of the static var flexible device. Represents a node Equipped with a static var flexible device, Represents a node No static var flexible device was configured; The normalized cross-sectional power transfer margin The calculation formula is: in, It is the set of all transmission sections in a power system. For the first The set of all lines in a transmission section; , For set The number of elements in the middle; The normalized configuration economic cost The calculation formula is: in, The cost of installing a unit capacity of static var flexible generator (SVM), The cost of installing a thyristor-controlled phase-shifting transformer per unit capacity, The cost of installing a controllable series reactor per unit capacity; To set the upper limit of the total cost budget for configuring thyristor-controlled phase-shifting transformers, The total active power loss of the power system before configuring the thyristor-controlled phase-shifting transformer; For the line The capacity of the phase-shifting transformer is controlled by thyristors. To consider the node admittance matrix after configuring thyristor-controlled phase-shifting transformers and controllable series reactance for each line. The Middle Line 1 The real part of the elements in the column.

3. The configuration method of multiple types of flexible AC transmission devices as described in any one of claims 1 to 2, characterized in that, The constraints include: power flow relationship constraints, steady-state operation constraints, fault mode constraints, thyristor-controlled phase-shifting transformer configuration constraints, and thyristor-controlled phase-shifting transformer configuration technical and economic constraints.

4. The configuration method of multiple types of flexible AC transmission devices as described in claim 3, characterized in that, The configuration constraints for the thyristor-controlled phase-shifting transformer include: in, For the line The capacity of the phase-shifting transformer is controlled by thyristors. For the line The active power; Configure capacity margin for thyristor-controlled phase-shifting transformers. ; For nodes Configure the state variables of the static var flexible device. Represents a node Equipped with a static var flexible device, Represents a node No static var flexible device was configured; For nodes Configure thyristor control of the state variables of the phase-shifting transformer. Represents a node Equipped with a thyristor-controlled phase-shifting transformer, Represents a node The phase-shifting transformer was not configured with thyristor control. , The number of nodes; , This represents the total number of lines in the power system. For the line The state variables of the phase-shifting transformer are controlled by thyristors. Indicates the line It is equipped with a thyristor-controlled phase-shifting transformer. Indicates the line The phase-shifting transformer is not equipped with thyristor control. For the line Configure controllable serial impedance state variables on the top. Indicates the line It is equipped with a controllable series reactor. Indicates the line The upper part is not configured with a controllable series reactor; A collection of nodes and lines on which flexible AC transmission devices can be installed; For the line The first node, For the line The terminal node; The technical and economic constraints of the thyristor-controlled phase-shifting transformer configuration include: in, The cost of installing a unit capacity of static var flexible generator (SVM), The cost of installing a thyristor-controlled phase-shifting transformer per unit capacity, The cost of installing a controllable series reactor per unit capacity; For the line The equivalent reactance of the controllable series reactance is configured on top; For nodes The reactive power injected by the static reactive flexible device at the location; To set the upper limit of the total cost budget for configuring thyristor-controlled phase-shifting transformers, The total active power loss of the power system before configuring the thyristor-controlled phase-shifting transformer; To consider the node admittance matrix after configuring thyristor-controlled phase-shifting transformers and controllable series reactance for each line. The Middle Line 1 The real part of the elements in the column; For the line The voltage amplitude at the first node, For the line The voltage amplitude at the tail node; For the line The voltage phase of the first node, For the line The voltage phase of the tail node.

5. The configuration method of multiple types of flexible AC transmission devices as described in any one of claims 1 to 2, characterized in that, The various types of flexible AC transmission devices include: static var converters, thyristor-controlled phase-shifting transformers, and controllable series reactors; the combined configuration schemes of the various types of flexible AC transmission devices include: The configuration parameters of the static var flexible device are: the reactive power injected by the static var flexible device and the state variables of the static var flexible device. The configuration parameters of the thyristor-controlled phase-shifting transformer are: the capacity of the thyristor-controlled phase-shifting transformer, the ideal phase-shifting angle of the thyristor-controlled phase-shifting transformer, the voltage ratio, the internal reactance of the thyristor-controlled phase-shifting transformer, and the state variables of the thyristor-controlled phase-shifting transformer. The configuration parameters of the controllable series reactor are: the equivalent reactance of the controllable series reactor and the state variables of the controllable series reactor.

6. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the configuration method for multiple types of flexible AC transmission devices as described in any one of claims 1 to 5.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the configuration method for multiple types of flexible AC transmission devices as described in any one of claims 1 to 5.

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