Asynchronous interconnection double-region frequency cooperative control method and device

Abstract

The invention discloses an asynchronous interconnection double-region frequency cooperative control method and device. The method comprises the following steps: acquiring asynchronous interconnection double-region information; according to the asynchronous interconnection double-region information, constructing an asynchronous interconnection double-region model; according to the asynchronous interconnection double-region model, control parameters are calculated, and the control parameters comprise a proportionality coefficient and an integral coefficient; according to control modes of automatic power generation control, a target control mode combination is determined, and the control modes comprise fixed frequency control, fixed power control and tie line deviation control; and according to the control parameters and the target control mode combination, performing dual-region frequency cooperative control. According to the invention, frequency cooperative control is realized, and accuracy and frequency stability are improved. The method can be widely applied to the technical field of electric power engineering.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power engineering, and in particular to an asynchronous interconnected dual-area frequency coordinated control method and device. Background Art

[0002] High-voltage direct current (HVDC) transmission technology has the characteristics of low construction cost, small transmission loss and small environmental impact. However, the isolation characteristics of DC transmission weaken the power mutual assistance ability between power grids to a certain extent. In an asynchronous power grid system connected only by HVDC links, the frequencies of the two power grids are independent of each other, and DC power transmission is required to quickly respond to grid frequency changes to improve the frequency stability of the power grid. Traditional frequency control methods only control the frequency of the power system at the sending or receiving end of the DC system, and design and optimize the parameter setting of the frequency controller for the sending power grid. However, the sending and receiving areas of the power system have overall frequency dynamic characteristics, resulting in low control accuracy and low frequency stability.

[0003] In summary, the technical problems existing in the relevant technologies need to be improved. Summary of the invention

[0004] The embodiments of the present invention provide an asynchronously interconnected dual-region frequency coordinated control method and device, which effectively improves the accuracy and frequency stability.

[0005] On the one hand, an embodiment of the present invention provides an asynchronous interconnected dual-region frequency coordinated control method, comprising the following steps: Get asynchronous interconnected dual-region information; Constructing an asynchronous interconnected dual-region model according to the asynchronous interconnected dual-region information; According to the asynchronous interconnected dual-region model, a control parameter is calculated, wherein the control parameter includes a proportional coefficient and an integral coefficient; Determining a target control mode combination according to a control mode of automatic power generation control, wherein the control mode includes fixed frequency control, fixed power control and tie line deviation control; Dual-area frequency coordinated control is performed according to the combination of the control parameters and the target control mode.

[0006] In some embodiments, constructing an asynchronous interconnection dual-region model according to the asynchronous interconnection dual-region information includes: According to the steam volume time constant, the steam turbine prime mover model is constructed; According to the time constant of water hammer effect, the turbine prime mover model is constructed; Constructing a DC frequency controller model according to the proportional coefficient and the integral coefficient; The asynchronous interconnected dual-region model is constructed according to the steam turbine prime mover model, the water turbine prime mover model, the DC frequency controller model, the asynchronous interconnected dual-region information, the hydropower unit regulation coefficient and the thermal power unit regulation coefficient.

[0007] In some embodiments, the calculating of control parameters according to the asynchronous interconnected dual-region model includes: Performing equivalent transformation on the asynchronous interconnected dual-region model to obtain a dual-region structure block diagram of an asynchronous interconnected system; According to the dual-area structure block diagram of the asynchronous interconnected system and the power disturbance, a closed-loop system transfer function is constructed; constructing a denominator polynomial according to the closed-loop system transfer function; According to the denominator polynomial, construct a system characteristic equation; According to the system characteristic equation, calculating the closed-loop poles; According to the Routh criterion and the denominator polynomial, a Routh table is constructed; According to the Routh table and the closed-loop poles, necessary and sufficient condition constraints for system stability are constructed; According to the necessary and sufficient conditions for system stability, the relationship between system stability and control parameters is calculated; Determining a control parameter stability domain according to the relationship between the system stability and the control parameter; Calculate the comprehensive stabilization time based on the step stabilization time; The control parameter is determined according to the asynchronous interconnection system parameter, the control parameter stability domain and the comprehensive stability time.

[0008] In some embodiments, determining the target control mode combination according to the control mode of the automatic power generation control includes: Calculating the regional control deviation of the fixed frequency control according to the frequency deviation and the regional frequency deviation coefficient; Calculating the regional control deviation of the tie line deviation control according to the frequency deviation, the regional frequency deviation coefficient and the interconnection system tie line power; According to the control mode, determining a control mode combination to be selected; Calculating the relationship between the frequency change of the asynchronous interconnected dual-region power grid and the combination of the control modes to be selected according to the proportional coefficient and the integral coefficient; Calculating the relationship between the DC transmission power involved in frequency regulation and the combination of control modes to be selected according to the proportional coefficient and the integral coefficient; According to the regional control deviation of the fixed frequency control, the regional control deviation of the tie line deviation control, the relationship between the frequency change of the asynchronous interconnected dual-region power grid and the combination of control modes to be selected, and the relationship between the DC transmission power participating in frequency regulation and the combination of control modes to be selected, an adaptive analysis of automatic power generation control is performed to obtain the target control mode combination.

[0009] In some embodiments, the method further comprises: Conduct dual-region frequency coordinated control experiments; The dual-region frequency coordinated control experiment comprises the following steps: In the asynchronous interconnected dual-region model, the power grid capacity of the first region and the power grid capacity of the second region are set; The power disturbance in the first area, the power disturbance in the second area and the DC lockout fault are simulated, and the asynchronous interconnected dual-area model is simulated and analyzed to obtain the frequency control experiment results.

[0010] In some embodiments, the closed-loop system transfer function is expressed as: , In the formula, is the closed-loop system transfer function with the power disturbance in the first region as input, is the Laplace transform of the frequency difference between the two regions, is the Laplace transform of the power disturbance in the first region, and are polynomial coefficients, , , is the complex variable in Laplace transform, .

[0011] In some embodiments, the step of calculating the comprehensive stabilization time according to the step stabilization time includes: According to the step stabilization time, the comprehensive stabilization time is calculated by the comprehensive stabilization time calculation formula, and the comprehensive stabilization time calculation formula is: , In the formula, is the comprehensive stabilization time, is the step stabilization time after the step disturbance occurs in the first region, is the step stabilization time after a step disturbance occurs in the second region.

[0012] In some embodiments, the calculating the regional control deviation of the tie line deviation control according to the frequency deviation, the regional frequency deviation coefficient and the interconnection system tie line power includes: According to the frequency deviation, the regional frequency deviation coefficient and the interconnection system tie line power, the regional control deviation of the tie line deviation control is calculated by the regional control deviation calculation formula of the tie line deviation control, and the regional control deviation calculation formula of the tie line deviation control is: , In the formula, is the regional control deviation of the tie line deviation control, is the regional frequency deviation coefficient, is the frequency deviation, is the interconnection line power of the interconnection system.

[0013] On the other hand, an embodiment of the present invention provides an asynchronous interconnected dual-region frequency coordinated control device, comprising: The first module is used to obtain asynchronous interconnected dual-region information; The second module is used to construct an asynchronous interconnected dual-region model according to the asynchronous interconnected dual-region information; A third module is used to calculate control parameters according to the asynchronous interconnected dual-region model, wherein the control parameters include a proportional coefficient and an integral coefficient; A fourth module is used to determine a target control mode combination according to a control mode of automatic power generation control, wherein the control mode includes fixed frequency control, fixed power control and tie line deviation control; The fifth module is used to perform dual-area frequency coordinated control according to the control parameter and the target control mode combination.

[0014] In another aspect, an embodiment of the present invention provides a computer device, comprising: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the described method.

[0015] The beneficial effects of the present invention are as follows: The embodiment of the present invention first obtains asynchronous interconnected dual-region information, then constructs an asynchronous interconnected dual-region model according to the asynchronous interconnected dual-region information, calculates control parameters according to the asynchronous interconnected dual-region model, and then determines a target control mode combination according to the control mode of automatic power generation control. Finally, dual-region frequency collaborative control is performed according to the control parameters and the target control mode combination, so that frequency collaborative control can be achieved by determining the optimal control parameters and control modes, thereby improving accuracy and frequency stability.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a flow chart of an asynchronous interconnected dual-region frequency coordination control method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a back-to-back DC engineering structure in site A according to an embodiment of the present invention; Figure 3 A schematic diagram of a steam turbine prime mover model structure according to an embodiment of the present invention; Figure 4 A schematic diagram of a water turbine prime mover model structure according to an embodiment of the present invention; Figure 5 A schematic diagram of a DC frequency controller model structure according to an embodiment of the present invention; Figure 6 A schematic diagram of an asynchronous interconnected dual-region model structure according to an embodiment of the present invention; Figure 7 A dual-region structure block diagram of an asynchronous interconnection system according to an embodiment of the present invention; Figure 8 A schematic diagram of parameters of an asynchronous interconnected dual-region model according to an embodiment of the present invention; Fig. 9 A schematic diagram of a control parameter value range when the system is stable according to an embodiment of the present invention; Fig.10 A comparison diagram of frequency deviations of region 1 and region 2 under direct current frequency control and frequency deviation of region 1 without control according to an embodiment of the present invention; Fig.11 This is an embodiment of the present invention When the value is appropriate, different Comparison chart of the impact on frequency deviation in region 1; Fig.12 This is an embodiment of the present invention When the value is appropriate, different Comparison chart of the impact on frequency deviation in region 1; Fig.13A control parameter of the embodiment of the present invention is , The overall stabilization time Impact comparison chart: Fig.14 A schematic diagram of a DC frequency control effect after secondary frequency modulation according to an embodiment of the present invention; Fig.15 A frequency deviation comparison diagram of region 1 under different control modes according to an embodiment of the present invention; Fig.16 A comparison diagram of DC frequency modulation power under different control modes according to an embodiment of the present invention; Fig.17 This is a frequency deviation comparison diagram of the two side areas under the disturbance of the first area when there is no AGC in an embodiment of the present invention; Fig.18 This is a frequency deviation comparison diagram of the two side areas under the second area disturbance when there is no AGC in an embodiment of the present invention; Fig.19 A frequency deviation comparison diagram of two side regions under DC blocking without AGC in an embodiment of the present invention; Fig. 20 It is a schematic diagram of the difference between the frequencies of the two side areas when the first area is disturbed without AGC in an embodiment of the present invention; Fig.21 It is a schematic diagram of the difference between the frequencies of the two side areas under the disturbance of the second area when there is no AGC in an embodiment of the present invention; Fig. 22 A schematic diagram of the difference in frequency between two side regions under DC blocking without AGC in an embodiment of the present invention; Fig.23 This is a schematic diagram of DC frequency modulation power under first area disturbance without AGC according to an embodiment of the present invention; Fig.24 A schematic diagram of DC frequency modulation power under a second region disturbance without AGC according to an embodiment of the present invention; Fig.25 This is a schematic diagram of DC frequency modulation power under DC blocking without AGC according to an embodiment of the present invention; Fig.26 This is a frequency deviation comparison diagram of the two side areas under the disturbance of the first area when there is AGC in an embodiment of the present invention; Fig. 27 This is a frequency deviation comparison diagram of the two side areas under the disturbance of the second area when there is AGC in an embodiment of the present invention; Fig.28 A frequency deviation comparison diagram of two side regions under DC blocking with AGC in an embodiment of the present invention; Fig.29 It is a schematic diagram of the difference between the frequencies of the two side areas when the first area is disturbed when there is AGC in an embodiment of the present invention; Fig.30 It is a schematic diagram of the difference between the frequencies of the two side areas under the disturbance of the second area when there is AGC in an embodiment of the present invention; Fig.31 It is a schematic diagram of the difference between the frequencies of the two side regions under DC blocking when AGC is enabled in an embodiment of the present invention; Fig.32 A schematic diagram of DC frequency modulation power under first region disturbance with AGC in an embodiment of the present invention; Fig.33 A schematic diagram of DC frequency modulation power under second region disturbance with AGC in an embodiment of the present invention; Fig.34 This is a schematic diagram of DC frequency modulation power under DC blocking with AGC according to an embodiment of the present invention; Fig.35 This is a schematic diagram of the structure of an asynchronous interconnected dual-region frequency cooperative control device according to an embodiment of the present invention; Fig.36 The figure is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. They are only examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the attached claims.

[0020] It is understood that the terms "first", "second", etc. used in this application can be used to describe various concepts in this article, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another concept. For example, without departing from the scope of the embodiment of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination".

[0021] The terms "at least one", "multiple", "each", "any", etc. used in this application, at least one includes one, two or more, multiple includes two or more, each refers to each of the corresponding multiple, and any refers to any one of the multiple.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0023] Before describing the embodiments of the present application in detail, some nouns and terms involved in the embodiments of the present application are first described. The nouns and terms involved in the embodiments of the present application are subject to the following explanations.

[0024] Asynchronous interconnection: refers to the asynchronous connection between power grids in different regions through power electronic equipment.

[0025] Among the related technologies, high-voltage direct current (HVDC) transmission technology is considered to be an efficient solution for power system interconnection due to its low construction cost, small transmission loss and small impact on the environment. Asynchronous grid interconnection, as a key application area of ​​HVDC technology, realizes asynchronous operation between regional power grids through back-to-back DC projects. However, the isolation characteristics of DC transmission weaken the power mutual assistance capability between power grids to a certain extent. In an asynchronous power grid system connected only by HVDC links, the frequencies of the two power grids are independent of each other, which brings new challenges to the frequency stability and power support of the power grid. Therefore, in the context of asynchronous networking, how to optimize the dispatching strategy, reasonably allocate and coordinate the frequency regulation resources within the network to maintain the stability of the power grid frequency and ensure the reliability and safety of the system has become a difficult problem that needs to be overcome in the current power system research field. DC power transmission can quickly respond to changes in grid frequency, provide necessary power support, and improve the frequency stability of the power grid. At present, the relevant research on DC frequency regulation mainly focuses on the application of DC frequency regulation technology in the sending or receiving power grid. Most frequency control analyses only study the frequency control strategies for the power systems at the sending or receiving end of the DC system, without considering the frequency changes on both sides of the interconnected DC system and the influence of the control scheme on the frequency characteristics on both sides. In the research on the optimization of DC frequency control parameter setting, most studies only analyze the frequency controller design and parameter setting optimization of the DC system sending-end power grid on the frequency stability of the sending-end power grid, lacking consideration of the overall frequency dynamic characteristics of both sides of the DC interconnected system, and most studies have not studied the adaptability of the DC asynchronous interconnected power grid after the introduction of AGC (automatic generation control) under the same frequency control, resulting in low control accuracy and low frequency stability. Therefore, in the current context, the frequency stability problem of asynchronously interconnected power systems needs to be taken seriously, and more attention and research is urgently needed on the DC frequency control of the two-side system, and the theoretical analysis, setting of important control parameters, and adaptability of coordination with AGC in this direction are more urgent.

[0026] In view of this, the embodiment of the present invention proposes an asynchronous interconnected dual-area frequency coordinated control method and device. First, a frequency dynamic analysis model of an asynchronous interconnected dual-area system with AGC in the same frequency control mode is built, including models such as steam turbine prime mover, water turbine prime mover, DC frequency controller, AGC control, etc., which can not only simulate the frequency response of the system under different working conditions, but also provide a theoretical basis for the optimization of subsequent control strategies. Secondly, the asynchronous interconnected model is analyzed for stability, and the control parameters are calculated. , The stability domain of the DC frequency controller is given by the parameter optimization method considering the frequency synchronization time of the power grids on both sides of the asynchronous interconnection. , integral coefficient Parameter optimization is performed to achieve frequency modulation resource sharing between asynchronous interconnected regional power grids and quickly provide frequency support. Finally, the adaptability analysis of DC frequency control and AGC control is performed to study the frequency deviation changes and DC frequency modulation power changes under different control modes, and frequency coordinated control is performed by considering different AGC control modes under the same frequency control mode.

[0027] An asynchronous interconnected dual-region frequency collaborative control method provided in an embodiment of the present application relates to the field of electric power engineering technology. An asynchronous interconnected dual-region frequency collaborative control method provided in an embodiment of the present application can be applied to a terminal, can also be applied to a server, and can also be software running in a terminal or a server. In some embodiments, the terminal can be a smart phone, a tablet computer, a laptop computer, a desktop computer, a smart speaker, a smart watch, and a vehicle-mounted terminal, etc., but is not limited to this; the server side can be configured as an independent physical server, or it can be configured as a server cluster or distributed system composed of multiple physical servers, and can also be configured as a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms. The server can also be a node server in a blockchain network; the software can be an application that implements an asynchronous interconnected dual-region frequency collaborative control method, etc., but is not limited to the above forms.

[0028] The present application can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, etc. The present application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application can also be practiced in distributed computing environments, in which tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media including storage devices.

[0029] The following is a detailed explanation of the embodiments of the present application in conjunction with the accompanying drawings: Figure 1 is an optional flow chart of an asynchronous interconnected dual-region frequency coordinated control method provided in an embodiment of the present application. Figure 1 The method may include but is not limited to steps S101 to S105.

[0030] Step S101, obtaining asynchronous interconnected dual-region information; Step S102: constructing an asynchronous interconnected dual-region model according to the asynchronous interconnected dual-region information; Step S103, calculating control parameters according to the asynchronous interconnected dual-region model, the control parameters including a proportional coefficient and an integral coefficient; Step S104, determining a target control mode combination according to the control mode of automatic power generation control, where the control mode includes fixed frequency control, fixed power control and tie line deviation control; Step S105: perform dual-area frequency coordinated control according to the control parameter and target control mode combination.

[0031] Steps S101 to S105 shown in the embodiment of the present application implement frequency coordinated control and improve accuracy and frequency stability.

[0032] In step S101 of some embodiments, the asynchronous interconnected dual-region information may be obtained through a power system information database, or may be obtained through other methods, not limited thereto.

[0033] In some embodiments, in step S102, constructing an asynchronous interconnection dual-region model according to the asynchronous interconnection dual-region information may include but is not limited to the following steps: According to the steam volume time constant, the steam turbine prime mover model is constructed; According to the time constant of water hammer effect, the turbine prime mover model is constructed; According to the proportional coefficient and the integral coefficient, a DC frequency controller model is constructed; An asynchronous interconnected dual-area model is constructed based on the steam turbine prime mover model, the water turbine prime mover model, the DC frequency controller model, the asynchronous interconnected dual-area information, the hydropower unit regulation coefficient and the thermal power unit regulation coefficient.

[0034] In some embodiments, asynchronous interconnection refers to the asynchronous connection between power grids in different regions through power electronic devices. The asynchronous interconnected power grid achieves precise control and rapid adjustment of the transmitted power through the high controllability of the DC transmission system, thereby improving the safety and flexibility of the power grid. Figure 2 As shown, the combination of large-capacity flexible DC and conventional DC can improve the flexible control of power by the power grid, reduce transmission losses and transmission failures, and ensure the safe and stable operation of the power grid. In the figure, VSC (Voltage Source Converter) is a voltage source converter, and LCC (Line-Commutated Converter) is a current source converter. VSC provides higher flexibility and control capabilities, while LCC may be more cost-effective in some applications. DC asynchronous interconnection enables AC power systems of different frequencies to exchange electric energy, which can solve the problem of cross-regional power grid stability, but at the same time it also loses the frequency support capability between regions. In order to enhance the frequency support capability between two regions through DC interconnection, this embodiment uses PI control (proportional integral controller) as a DC frequency controller to realize the frequency synchronization control function of asynchronous interconnection area, and uses the frequency deviation of the two-side area as input. The PI controller dynamically adjusts the output power of the DC system to simultaneously adjust the frequency stability of the two-side areas. For example, when a certain area is subject to power disturbance, the frequency decreases. The DC frequency controller detects the frequency deviation of the two-side area. Through PI control, the DC system will output higher power to the low-frequency area, thereby realizing the frequency support of the high-frequency area to the low-frequency area.

[0035] The steam turbine prime mover model can be constructed based on the steam volume time constant. The steam turbine prime mover model structure is as follows: Figure 3 As shown, is the steam volume time constant. Then, according to the water hammer effect time constant, the turbine prime mover model is constructed, where the turbine prime mover model structure is as follows: Figure 4 As shown, is the time constant of water hammer effect. Then, according to the proportional coefficient and integral coefficient, a DC frequency controller model is constructed, where the DC frequency controller model structure is as follows: Figure 5 As shown, the controller adopts PI control (proportional integral controller), with the frequency difference as input. is the proportionality coefficient, is the integration coefficient, Finally, based on the steam turbine prime mover model, the water turbine prime mover model, the DC frequency controller model, the asynchronous interconnected dual-region information, the hydropower unit regulation coefficient and the thermal power unit regulation coefficient, an asynchronous interconnected dual-region model is constructed. Figure 6 As shown, there are two regions, is the system equivalent inertia in the first region, is the system equivalent inertia in the second region, is the equivalent damping coefficient of the first region, is the equivalent damping coefficient of the second region, is the turbine prime mover model of the hydropower unit, is the hydropower unit regulation coefficient, is the proportion of hydropower units generating electricity, is the steam turbine prime mover model, is the regulation coefficient of thermal power unit, is the proportion of thermal power generation, The DC interconnection line transmits power. is a DC frequency controller, is the regional frequency deviation coefficient of the first region (MW / 0.1Hz), is the regional frequency deviation coefficient of the second region (MW / 0.1Hz), is the integral coefficient of the AGC in the first area, is the integral coefficient of the AGC in the second region, is the DC output power in the first region, is the DC output power of the second region, is the grid frequency deviation in the first region, is the grid frequency deviation in the second area.

[0036] It can be understood that the DC frequency controller uses the power regulation characteristics of the HVDC (high voltage direct current transmission) system to link the frequencies of the power grids on both sides. When a power disturbance occurs on one side of the power grid, resulting in a frequency deviation, the DC frequency controller generates an adjustment command by detecting the frequency difference and adjusts the HVDC transmission power based on the proportional integral control algorithm. By increasing or decreasing the power transmitted from one side of the power grid to the other, the frequencies are gradually converged. Since the HVDC system responds quickly, it can suppress frequency deviations and restore grid stability in a short time, thereby achieving frequency support and co-frequency control of asynchronous interconnected power grids. Control parameters of the DC frequency controller , The value of will not only affect the stability of the DC interconnected system, but also be related to the regulation effect of the DC frequency controller on the frequency of the power grids on both sides. Therefore, it is necessary to conduct a theoretical analysis of the system stability in order to determine the influence of the DC frequency controller parameter value on the frequency stability of the interconnected system on both sides.

[0037] In some embodiments, in step S103, the control parameters are calculated according to the asynchronous interconnected dual-region model, which may include but is not limited to the following steps: By performing equivalent transformation on the asynchronous interconnected dual-region model, a dual-region structure block diagram of the asynchronous interconnected system is obtained; According to the dual-area structure block diagram of the asynchronous interconnected system and the power disturbance, the closed-loop system transfer function is constructed; According to the closed-loop system transfer function, construct the denominator polynomial; According to the denominator polynomial, construct the system characteristic equation; According to the system characteristic equation, calculate the closed-loop poles; According to Routh criterion and denominator polynomial, construct Routh table; According to Routh table and closed-loop poles, construct necessary and sufficient condition constraints for system stability; According to the necessary and sufficient conditions for system stability, calculate the relationship between system stability and control parameters; According to the relationship between system stability and control parameters, the control parameter stability domain is determined; Calculate the comprehensive stabilization time based on the step stabilization time; The control parameters are determined according to the asynchronous interconnection system parameters, the control parameter stability domain and the comprehensive stability time.

[0038] In some embodiments, the control parameters can be calculated based on the asynchronous interconnected dual-region model, where the control parameters include a proportional coefficient and an integral coefficient. In the process of calculating the control parameters, AGC control (automatic generation control) can be temporarily ignored, and only the relationship between DC frequency control and system primary frequency modulation control can be considered. The asynchronous interconnected dual-region model can be equivalently transformed to obtain a dual-region structure block diagram of the asynchronous interconnected system, where the dual-region structure block diagram of the asynchronous interconnected system is as follows: Figure 7 As shown, The power disturbance in the first region is is the power disturbance of the second region, and the output y is the difference between the frequencies of the two regions. is the reference value of the frequency difference. Setting the reference value to zero can make the frequencies of the two regions consistent. Then, according to the dual-region structure block diagram of the asynchronous interconnected system and the power disturbance, a closed-loop system transfer function is constructed. For example, the system structure block diagram is analyzed, and the power disturbances of the first region and the second region are respectively and As input, the frequency deviation between the two regions As output, analyze the power disturbances at different and The closed-loop system transfer function is and , where the expression of the closed-loop system transfer function with the power disturbance in the first region as input is: , the expression of the closed-loop system transfer function with the power disturbance in the second area as input is: , where is the closed-loop system transfer function with the power disturbance in the first region as input, is the closed-loop system transfer function with the power disturbance in the second region as input, is the Laplace transform of the frequency difference between the two regions, is the Laplace transform of the power disturbance in the first region, is the Laplace transform of the power disturbance in the second region, , and are polynomial coefficients, , , , , is the complex variable in Laplace transform, It is understood that in control system analysis, the closed-loop transfer function describes the mathematical relationship between the output response and the input signal in a closed-loop control system. Correct analysis of the closed-loop transfer function can ensure that the system is stable and has dynamic and steady-state characteristics that meet the requirements of a specific application.

[0039] Then, according to the closed-loop system transfer function, the denominator polynomial is constructed, where the expression of the denominator polynomial is: , where is the denominator polynomial. Then, the system characteristic equation is constructed based on the denominator polynomial, and the closed-loop poles are calculated based on the system characteristic equation. For example, the denominator polynomial of the closed-loop system transfer function of the asynchronous interconnected dual-region model is about The characteristic equation of the system can be constructed by setting the fifth-order polynomial of the system equal to zero. The characteristic equation plays an important role in the stability analysis of the control system because it is directly related to the poles of the closed-loop system. The stability of the closed-loop system is completely determined by the roots (closed-loop poles) of the closed-loop characteristic equation. Then, based on the Routh criterion and the denominator polynomial, the Routh table is constructed. It can be understood that the Routh criterion is a mathematical method for judging the stability of a system. It determines whether the system is stable by analyzing the coefficients of the denominator polynomial of the closed-loop transfer function. If all the poles of the closed-loop transfer function are located in the left half of the complex plane, the system is stable; if any pole is located in the right half, the system is unstable. By constructing the Routh table, we can avoid solving high-order characteristic equations and simplify the process of stability analysis. Then, based on the Routh table and the closed-loop poles, the necessary and sufficient conditions for system stability are constructed. It is understandable that according to the Routh criterion analysis, the necessary and sufficient conditions for system stability are: all coefficients of the characteristic equation are positive numbers, and the elements in the first column of the Routh table are positive numbers; therefore, the expression of the necessary and sufficient condition constraints for the system stability of the asynchronous interconnected system is: , where , , , .

[0040] Then, according to the necessary and sufficient conditions for system stability, the relationship between system stability and control parameters is calculated, and according to the relationship between system stability and control parameters, the control parameter stability domain is determined. For example, by constructing a Routh table for the denominator polynomial of the closed-loop transfer function of the interconnected system, the controller parameters are calculated and analyzed under the constraints of the necessary and sufficient conditions for system stability, and the system stability and control parameters are obtained. , , thus obtaining the system’s , The control parameter stability domain. The asynchronous interconnected dual-region model parameters can be set as Figure 8 As shown in the figure, the parameters are substituted into the asynchronous interconnected dual-region model, the denominator polynomial of the closed-loop transfer function is calculated, and the stability condition of the Routh criterion is combined to obtain the system stability. , The value range of the control parameters of the DC frequency controller under the condition of system stability is obtained as follows Fig. 9 The shaded part is shown in the figure. When a power disturbance occurs, the frequency of the grid on one side changes, and the frequency difference between the two grids increases. The DC frequency controller starts to respond and adjusts the DC output power to reduce the frequency difference until the frequencies of the two grids return to the same level. , When the value is appropriate, the frequency changes of the two regions under DC frequency control and the grid frequency changes on the disturbance occurrence side without DC frequency control are as follows: Fig.10 shown. Fig.10 In the case of no DC frequency control, the maximum frequency deviation after the disturbance in the first area is -0.036Hz. When DC frequency control is applied, the maximum frequency deviation is -0.018Hz. It can be seen that the control parameters , When the value is appropriate, the frequency deviation can be greatly reduced, and the time for the frequency to reach stability will be greatly shortened, realizing timely and effective frequency support for asynchronously interconnected dual regions. When the DC frequency controller uses the frequency deviation of the two regions as input, the deviation is 0 as the reference value, such as Fig.11 As shown in the figure, the frequency of the first area drops rapidly after the disturbance occurs, and the frequency of the second area follows synchronously under the action of the controller. , When the values ​​are appropriate, the frequencies of the two regions can converge within a few seconds. In addition to system stability, the control parameters , The value has an important influence on the minimum frequency value and the stabilization time of the two side areas. , The frequency change of the first area under the parameter is as follows Fig.11 and Fig.12 The frequency change of the second area is not shown in the figure. The frequency synchronization effect is shown in Fig.10 . Fig.11 In, when When choosing an appropriate value, When the frequency deviation is large, When it is close to the critical value of the stable region, it shows an oscillation phenomenon and the stable time is longer. When it increases, the frequency deviation decreases and the stabilization time decreases; when When it is greater than a certain level, The increase in has a smaller impact on the frequency stability index, the maximum value of the frequency deviation increases slightly in the opposite direction, and the frequency stabilization time remains almost unchanged. Fig.12 In, when When choosing an appropriate value, When it is smaller, the frequency deviation is larger and the stabilization time is longer; when When it increases, the frequency deviation gradually decreases and the stabilization time decreases; when When it is greater than a certain level, The increase has almost no effect on the frequency stabilization time, and the maximum frequency deviation increases in the opposite direction.

[0041] Finally, according to the step stabilization time, the comprehensive stabilization time is calculated by the comprehensive stabilization time calculation formula, and the control parameters are determined according to the asynchronous interconnection system parameters, control parameter stability domain and comprehensive stabilization time. Among them, the comprehensive stabilization time calculation formula is: , where is the comprehensive stabilization time, The closed-loop transfer function when a power step disturbance occurs in the first region is The step settling time, The closed-loop transfer function when a power step disturbance occurs in the second region is It can be understood that the stabilization time is used to describe the ability of the system output to enter and remain near the final steady-state value after a step input. A shorter stabilization time indicates that the system can reach a stable state faster. In the above analysis, when , When the value is within the appropriate range, the maximum frequency deviation control effect is better and closer, and the stabilization time required for the frequency difference between the two regions to return to the reference value of 0 is usually a frequency stability indicator that is more valued in engineering. The time required for the frequency deviation of the two power grids to return to consistency when a disturbance occurs can be comprehensively considered, that is, the comprehensive stabilization time , where the stability range is 2% of the maximum frequency difference between the two sides after the disturbance occurs, that is, The smaller the stabilization time, the better the frequency control effect of the DC frequency controller. Control parameters with DC frequency controller , The relationship is as Fig.13 shown. Fig.13 In the figure, only the points with comprehensive stabilization time less than 25s are retained for display. When the control parameters are near the boundary of the stable domain, the stabilization time increases significantly and the frequency change shows an oscillating phenomenon. and Gradually increase the stabilization time and gradually decrease; when When it increases to a certain extent, if Continue to increase, comprehensive stability time will decrease at a very slow rate, that is, continue to increase The income is close to 0; when When it increases to a certain extent, if If the value continues to increase, the comprehensive stabilization time will show a slight increasing trend. In summary, the comprehensive stabilization time should be reduced to within 3 seconds and the control parameters should be , Comprehensive stabilization time when the value is minimum The best benefit can be obtained by optimizing the analysis through MATLAB mathematical tools. =1609, =6136 when the DC frequency control effect is optimal.

[0042] In some embodiments, in step S104, determining a target control mode combination according to the control mode of automatic power generation control may include but is not limited to the following steps: Calculate the regional control deviation of fixed frequency control according to the frequency deviation and regional frequency deviation coefficient; Calculate the regional control deviation of the tie line deviation control based on the frequency deviation, regional frequency deviation coefficient and the interconnection system tie line power; According to the control mode, determine the control mode combination to be selected; According to the proportional coefficient and the integral coefficient, the relationship between the frequency change of the power grids on both sides of the asynchronous interconnected dual-area and the combination of the selected control modes is calculated; According to the proportional coefficient and the integral coefficient, the relationship between the DC transmission power involved in the frequency regulation and the combination of the control modes to be selected is calculated; According to the regional control deviation of fixed frequency control, the regional control deviation of tie-line deviation control, the relationship between the frequency change of the power grids on both sides of the asynchronous interconnected dual regions and the combination of control modes to be selected, and the relationship between the DC transmission power participating in frequency regulation and the combination of control modes to be selected, an adaptive analysis of automatic generation control is carried out to obtain the target control mode combination.

[0043] In some embodiments, the target control mode combination can be determined according to the control mode of automatic power generation control, wherein the control modes include flat frequency control (FFC), flat tie-line control (FTC) and tie-line bias control (TBC). Primary frequency regulation is a differential regulation that cannot restore the grid frequency to the standard value, while secondary frequency regulation can achieve differential regulation and more accurately maintain the system frequency stability. Secondary frequency regulation is mainly achieved through automatic generation control (AGC), in which the computer automatically controls the load of each power plant unit to achieve automation of the entire frequency regulation process. After considering the secondary frequency regulation of the asynchronous interconnected dual-area system, the grid frequencies on both sides can be restored to the standard value of the frequency, and the DC frequency controller is still effective in controlling the frequencies on both sides. For example, the frequency deviation is Fig.14 As shown. In the control mode, the FFC mode means that the control target of the control area is to maintain the system frequency of the area at the set value, that is, to keep the frequency constant. The control target of the FTC mode is to maintain the interconnection line exchange power constant. The purpose of the TBC mode is to maintain the system frequency and interconnection line power within a predetermined range by controlling the interconnection line power between regions in a multi-region interconnected power system. In practical applications, the power system often adopts the FFC and TBC control modes. Therefore, in this embodiment, the DC frequency control characteristics under the FFC and TBC control modes will be analyzed.

[0044] Since different control modes have different control targets, the calculation methods of their regional control deviation (ACE) are also different, so the impact on the grid frequency is also different. The regional control deviation of fixed frequency control can be calculated based on the frequency deviation and the regional frequency deviation coefficient, and the regional control deviation of the tie line deviation control can be calculated based on the frequency deviation, the regional frequency deviation coefficient and the interconnected system tie line power. Among them, the calculation formula of the regional control deviation of fixed frequency control is: , the calculation formula of the regional control deviation of the tie line deviation control is: , where is the regional control deviation of constant frequency control, It is the regional control deviation of the tie line deviation control. is the regional frequency deviation coefficient, is the frequency deviation, is the interconnection line power of the interconnected system.

[0045] Then, according to the control mode, determine the combination of control modes to be selected, wherein the combination of control modes to be selected may include the first area being FFC + the second area being FFC, the first area being FFC + the second area being TBC, the first area being TBC + the second area being FFC, and the first area being TBC + the second area being TBC. Then, based on the proportional coefficient and the integral coefficient, calculate the relationship between the frequency change of the power grids on both sides of the asynchronously interconnected dual areas and the combination of control modes to be selected, and calculate the relationship between the DC transmission power involved in frequency regulation and the combination of control modes to be selected. Finally, based on the regional control deviation of fixed frequency control, the regional control deviation of tie line deviation control, the relationship between the frequency change of the power grids on both sides of the asynchronously interconnected dual areas and the combination of control modes to be selected, and the relationship between the DC transmission power involved in frequency regulation and the combination of control modes to be selected, perform an adaptive analysis of the automatic power generation control to obtain the target control mode combination. By way of example, it can be set , are the integral coefficients of the first and second regions of the AGC, respectively. When the absolute value of the coefficient is too large, it will cause system instability. It is usually set to be around -0.3. Set the integral coefficients of the AGC on both sides of the power grid to be -0.3, analyze the impact of different AGC control mode combinations on the frequency changes of the power grids on both sides, and obtain the relationship between the frequency changes of the power grids on both sides of the asynchronous interconnected dual-region and the combination of the selected control modes. Fig.15 As shown in the figure, the relationship between the DC transmission power involved in frequency regulation and the combination of the selected control modes is as follows: Fig.16 shown. Fig.15In the figure, the solid line is the frequency deviation of the first area, and the dotted line is the frequency deviation of the second area. When the first and second areas adopt the TBC+FFC or TBC+TBC mode, the maximum frequency deviation is slightly greater than the FFC+FFC or FFC+TBC mode; and in the TBC+TBC mode, the time required for the frequency of the power grids on both sides to recover to the standard frequency value is the shortest. Fig.16 In the figure, the disturbance occurs in area 1, and the negative value of the DC power involved in frequency regulation indicates that power needs to be transmitted from area 2 to area 1 to achieve frequency support. When areas 1 and 2 adopt TBC+FFC and TBC+TBC modes, the maximum DC power output is greater than that of FFC+FFC and FFC+TBC modes, but the DC regulation power involved in frequency regulation cannot be restored to 0 in the FFC+FFC mode. DC power recovery requires one side of the power grid to adopt the TBC control mode, and the time required for power to recover to 0 in the TBC+TBC mode is the shortest. Therefore, the four combinations of AGC control modes have similar control effects on the maximum frequency deviation and the maximum DC power involved in frequency regulation, while different combinations have different effects on the frequency recovery time and DC power recovery time. Among them, the control effect of frequency recovery and DC power recovery in the TBC+TBC mode is the best, and the TBC+TBC mode can be used as the target control mode combination.

[0046] In some embodiments, in step S105, dual-region frequency coordinated control can be performed according to the control parameter and target control mode combination. and the integral coefficient As a parameter, and combined with the optimal control mode combination (such as TBC+TBC mode) obtained by adaptability analysis as the target control mode combination, dual-area frequency coordinated control of the power system is carried out.

[0047] In some embodiments, the method further comprises: Conduct dual-region frequency coordinated control experiments; Conducting a dual-region frequency coordinated control experiment includes the following steps: In the asynchronous interconnected dual-region model, the power grid capacity of the first region and the power grid capacity of the second region are set; The power disturbance in the first area, the power disturbance in the second area and the DC lockout fault are simulated and analyzed, and the asynchronous interconnected dual-area model is simulated and analyzed to obtain the frequency control experimental results.

[0048] In some embodiments, in order to verify the adaptability and regulation characteristics of the optimized DC frequency control under different working conditions, a dual-area frequency coordinated control experiment can be carried out, and an asynchronous interconnected dual-area model and a DC asynchronous interconnected dual-area model containing AGC are built in Matlab / simulink, and the change characteristics of the system frequency and the change characteristics of the DC frequency regulation power under three working conditions, namely, power disturbance in area 1 (i.e., the first area), power disturbance in area 2 (i.e., the second area), and DC locking, are studied respectively. In the asynchronous interconnected dual-area model, the grid capacity of the first area and the grid capacity of the second area can be set first, and then the power disturbance in the first area, the power disturbance in the second area, and the DC locking fault can be simulated and analyzed, and the asynchronous interconnected dual-area model can be simulated and analyzed to obtain the frequency control experimental results. For example, the grid capacity of the first area can be set to 115049MW, and the grid capacity of the second area can be set to 277906MW. The three working conditions are respectively added to the first area and the second area at 5s, and the DC locking fault of 1000MW is simulated and analyzed, thereby verifying the frequency control effect of the DC frequency controller.

[0049] like Figure 17-Figure 25 As shown in the figure, a simulation analysis is performed on the DC asynchronous interconnected dual-region model without AGC. Fig.17 , Fig.18 , Fig.19 The frequency change of one side, the frequency difference change of both sides and the DC frequency modulation power change when a 1000MW power disturbance occurs in area 1; Fig. 20 , Fig.21 , Fig. 22 The frequency change of one side, the frequency difference change of both sides and the DC frequency modulation power change when a 1000MW power disturbance occurs in area 2; Fig.23 , Fig.24 , Fig.25 The frequency change of one side area, the frequency difference change of both sides and the DC frequency modulation power change under the 1000MW DC blocking fault, among which the control parameters of the DC frequency controller are The value is 1609. The value is 6136. Figure 17-Figure 19 It can be seen that the maximum value of the grid frequency deviation under the action of the DC frequency controller is 0.009Hz, which is reduced to about one-fourth of the maximum value of the frequency deviation of region 1 without DC control, and the grid frequencies on both sides tend to be consistent 2.64s after the disturbance occurs, which is significantly improved compared with the regional frequency stabilization time without control. (The value of the stable range in this embodiment is 2% of the maximum value of the frequency difference between the two sides after the disturbance occurs, that is, ) After the 1000MW disturbance occurred, the DC frequency modulation output power was reduced. In this process, part of the disturbance was distributed to the regional two power grid through the DC transmission line, and the frequency modulation resources of the regional two power grid were used for rapid support to prevent further frequency deviation. Under the joint action of the generator set and DC frequency modulation, a new power load balance state was reached, and the DC frequency modulation output power was stabilized at around 600MW. Figure 20-Figure 25 Similarly, it can be seen that the maximum value of frequency deviation under DC frequency modulation is effectively controlled, and the frequency areas of the power grids on both sides are consistent 2.06s and 1.87s after the disturbance occurs. Comprehensive analysis shows that the DC frequency controller can effectively respond to frequency changes under different disturbance faults and respond quickly under appropriate control parameters, and can quickly make the frequencies of the power grids on both sides tend to be consistent, realize mutual support of the frequencies of the power grids on both sides of the DC asynchronous interconnection, and make efficient use of the frequency modulation resources of the power grids on both sides.

[0050] like Figure 26-Figure 34 As shown in the figure, a simulation analysis is performed on the DC asynchronous interconnected dual-region model with AGC. Fig.26 , Fig. 27 , Fig.28 The frequency change of one side, the frequency difference change of both sides and the DC frequency modulation power change when a 1000MW power disturbance occurs in area 1; Fig.29 , Fig.30 , Fig.31 The frequency change of one side, the frequency difference change of both sides and the DC frequency modulation power change when a 1000MW power disturbance occurs in area 2; Fig.32 , Fig.33 , Fig.34 The frequency change of one side area, the frequency difference change of both sides and the DC frequency modulation power change under the 1000MW DC blocking fault, among which the control parameters of the DC frequency controller are The value is 1609. The value is 6136, the AGC control mode adopts TBC+TBC combination, the integral coefficient and Take -0.3. Figure 26-Figure 28It can be seen that in the three scenarios, under the joint action of AGC, the maximum absolute value of the frequency deviation of the power grids on both sides of the asynchronous interconnection using the DC frequency controller is 0.010Hz, 0.009Hz and 0.007Hz respectively, which are all smaller than the absolute value of the maximum frequency deviation of the system without DC frequency control, and due to the rapid action of the DC frequency modulation power, the frequency change rate of the power grid on the disturbance side is slightly reduced. Compared with the frequency change under DC frequency control without AGC control, it can be seen that after adding AGC, the DC frequency control still has a good control effect. Under the action of the DC frequency controller, the frequency stabilization time is 2.96s, 5.07s and 2.67s respectively. The frequency of the power grids on both sides of the asynchronous interconnection can quickly converge to achieve mutual support for the frequency of the power grids on both sides. The DC frequency modulation power under different working conditions is as follows: Figure 31-Figure 34 As shown in FIG. 1 , in the TBC mode, the calculation of the regional frequency deviation ACE takes into account both the grid frequency deviation and the DC frequency modulation power, so the DC frequency modulation power can be gradually restored to 0 under the action of the AGC.

[0051] The beneficial effects of implementing the embodiments of the present invention include: the embodiments of the present invention first obtain asynchronous interconnected dual-region information, then construct an asynchronous interconnected dual-region model based on the asynchronous interconnected dual-region information, and calculate control parameters based on the asynchronous interconnected dual-region model, and then determine the target control mode combination based on the control mode of automatic power generation control, and finally perform dual-region frequency collaborative control based on the control parameters and the target control mode combination, so that frequency collaborative control can be achieved by determining the optimal control parameters and control modes, thereby improving accuracy and frequency stability.

[0052] like Fig.35 As shown, the embodiment of the present invention also provides an asynchronous interconnected dual-region frequency coordinated control device, including: The first module 801 is used to obtain asynchronous interconnection dual-region information; The second module 802 is used to construct an asynchronous interconnection dual-region model according to the asynchronous interconnection dual-region information; The third module 803 is used to calculate the control parameters according to the asynchronous interconnected dual-region model, where the control parameters include a proportional coefficient and an integral coefficient; The fourth module 804 is used to determine a target control mode combination according to the control mode of automatic power generation control, where the control mode includes fixed frequency control, fixed power control and tie line deviation control; The fifth module 805 is used to perform dual-area frequency coordinated control according to a combination of control parameters and target control modes.

[0053] The contents of the above method embodiments are all applicable to the present device embodiments. The functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0054] like Fig.36 As shown, an embodiment of the present invention further provides a computer device, including: at least one processor 901; At least one memory 902, used to store at least one program; When at least one program is executed by at least one processor, the at least one processor implements Figure 1 The method shown.

[0055] The contents of the above method embodiments are all applicable to the present device embodiments. The functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0056] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. An asynchronous interconnected dual-region frequency coordinated control method, characterized in that: The following steps are involved: Get asynchronous interconnected dual-region information; Constructing an asynchronous interconnected dual-region model according to the asynchronous interconnected dual-region information; According to the asynchronous interconnected dual-region model, a control parameter is calculated, wherein the control parameter includes a proportional coefficient and an integral coefficient; Determining a target control mode combination according to a control mode of automatic power generation control, wherein the control mode includes fixed frequency control, fixed power control and tie line deviation control; Dual-area frequency coordinated control is performed according to the combination of the control parameters and the target control mode.

2. The method according to claim 1, characterized in that The step of constructing an asynchronous interconnected dual-region model according to the asynchronous interconnected dual-region information includes: According to the steam volume time constant, the steam turbine prime mover model is constructed; According to the time constant of water hammer effect, the turbine prime mover model is constructed; Constructing a DC frequency controller model according to the proportional coefficient and the integral coefficient; The asynchronous interconnected dual-region model is constructed according to the steam turbine prime mover model, the water turbine prime mover model, the DC frequency controller model, the asynchronous interconnected dual-region information, the hydropower unit regulation coefficient and the thermal power unit regulation coefficient.

3. The method according to claim 1, characterized in that The step of calculating control parameters according to the asynchronous interconnected dual-region model includes: Performing equivalent transformation on the asynchronous interconnected dual-region model to obtain a dual-region structure block diagram of an asynchronous interconnected system; According to the dual-area structure block diagram of the asynchronous interconnected system and the power disturbance, a closed-loop system transfer function is constructed; constructing a denominator polynomial according to the closed-loop system transfer function; According to the denominator polynomial, construct a system characteristic equation; According to the system characteristic equation, calculating the closed-loop poles; According to the Routh criterion and the denominator polynomial, a Routh table is constructed; According to the Routh table and the closed-loop poles, necessary and sufficient condition constraints for system stability are constructed; According to the necessary and sufficient conditions for system stability, the relationship between system stability and control parameters is calculated; Determining a control parameter stability domain according to the relationship between the system stability and the control parameter; Calculate the comprehensive stabilization time based on the step stabilization time; The control parameter is determined according to the asynchronous interconnection system parameter, the control parameter stability domain and the comprehensive stability time.

4. The method according to claim 1, characterized in that Determining the target control mode combination according to the control mode of the automatic power generation control includes: Calculating the regional control deviation of the fixed frequency control according to the frequency deviation and the regional frequency deviation coefficient; Calculating the regional control deviation of the tie line deviation control according to the frequency deviation, the regional frequency deviation coefficient and the interconnection system tie line power; According to the control mode, determining a control mode combination to be selected; Calculating the relationship between the frequency change of the asynchronous interconnected dual-region power grid and the combination of the control modes to be selected according to the proportional coefficient and the integral coefficient; Calculating the relationship between the DC transmission power involved in frequency regulation and the combination of control modes to be selected according to the proportional coefficient and the integral coefficient; According to the regional control deviation of the fixed frequency control, the regional control deviation of the tie line deviation control, the relationship between the frequency change of the asynchronous interconnected dual-region power grid and the combination of control modes to be selected, and the relationship between the DC transmission power participating in frequency regulation and the combination of control modes to be selected, an adaptive analysis of automatic power generation control is performed to obtain the target control mode combination.

5. The method according to claim 1, characterized in that The method further comprises: Conduct dual-region frequency coordinated control experiments; The dual-region frequency coordinated control experiment comprises the following steps: In the asynchronous interconnected dual-region model, the power grid capacity of the first region and the power grid capacity of the second region are set; The power disturbance in the first area, the power disturbance in the second area and the DC blocking fault are simulated, and the asynchronous interconnected dual-area model is simulated and analyzed to obtain the frequency control experiment results.

6. The method according to claim 3, characterized in that The expression of the closed-loop system transfer function is: ， In the formula, is the closed-loop system transfer function with the power disturbance in the first region as input, is the Laplace transform of the frequency difference between the two regions, is the Laplace transform of the power disturbance in the first region, and are polynomial coefficients, , , is the complex variable in Laplace transform, .

7. The method according to claim 3, characterized in that The step stabilization time is used to calculate the comprehensive stabilization time, including: According to the step stabilization time, the comprehensive stabilization time is calculated by the comprehensive stabilization time calculation formula, and the comprehensive stabilization time calculation formula is: ， In the formula, is the comprehensive stabilization time, is the step stabilization time after the step disturbance occurs in the first region, is the step stabilization time after a step disturbance occurs in the second region.

8. The method according to claim 4, characterized in that Calculating the regional control deviation of the tie line deviation control according to the frequency deviation, the regional frequency deviation coefficient and the interconnected system tie line power includes: According to the frequency deviation, the regional frequency deviation coefficient and the interconnection system tie line power, the regional control deviation of the tie line deviation control is calculated by the regional control deviation calculation formula of the tie line deviation control, and the regional control deviation calculation formula of the tie line deviation control is: ， In the formula, is the regional control deviation of the tie line deviation control, is the frequency deviation coefficient of the region, is the frequency deviation, is the interconnection line power of the interconnection system.

9. An asynchronous interconnected dual-region frequency coordinated control device, characterized in that: include: The first module is used to obtain asynchronous interconnected dual-region information; The second module is used to construct an asynchronous interconnected dual-region model according to the asynchronous interconnected dual-region information; A third module is used to calculate control parameters according to the asynchronous interconnected dual-region model, wherein the control parameters include a proportional coefficient and an integral coefficient; A fourth module is used to determine a target control mode combination according to a control mode of automatic power generation control, wherein the control mode includes fixed frequency control, fixed power control and tie line deviation control; The fifth module is used to perform dual-area frequency coordinated control according to the control parameter and the target control mode combination.

10. A computer device, characterized in that: include: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the method according to any one of claims 1 to 8.

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