Power regulation method and device of alternating current-direct current hybrid synchronous power grid, medium and product

Abstract

The invention discloses a power regulation method and device for an alternating-current and direct-current hybrid synchronous power grid, a medium and a product. The method comprises the steps that the actual frequencies of power grids on the two sides of a sending end and a receiving end in the alternating-current and direct-current hybrid synchronous power grid are collected in real time; calculating the frequency deviation between the actual frequency of the power grids on the two sides and the rated frequency of the system; generating an additional active power modulation signal according to the frequency deviation of the power grids on the two sides; and adjusting the AC / DC hybrid synchronous power grid by adopting the additional active power modulation signal. The cross-regional power coordination of the alternating-current and direct-current hybrid synchronous power grid is realized, the transient power angle stability of the alternating-current and direct-current hybrid synchronous power grid is improved, and the safe and stable operation of the power grid under a fault or disturbance condition is ensured.

Description

[0001] Power regulation methods, devices, media and products for AC / DC hybrid synchronous power grids Technical Field This invention relates to the field of flexible power transmission technology, and in particular to a power regulation method, device, medium, and product for an AC / DC hybrid synchronous power grid. Background Technology

[0002] New energy sources, DC transmission, energy storage devices, and power electronic loads together constitute the main equipment group of the new power system, exhibiting the typical "double high" characteristics of high proportion of new energy sources and high proportion of power electronic equipment. The structural form and stability characteristics of the power system face multiple challenges. The new power system adopts flexible transmission. After flexible DC zoning, the capacity and inertia of each AC zoning system are significantly reduced, and each region is prone to significant frequency fluctuations under power disturbances. Due to the relatively weak structure of the sending-end grid and insufficient support capacity of conventional power sources, the system strength decreases, and transient overvoltage and frequency stability problems become increasingly prominent. In the receiving-end grid, the continuous growth of load while local conventional power sources are gradually retired leads to a series of safety and stability operation problems such as excessive short-circuit current and decreased frequency dynamic support capacity. Before fully realizing flexible hybrid interconnection and reasonable zoning, the grid exists in a stage of AC / DC hybrid interconnection. When the receiving-end DC is blocked or other power shortage faults occur, it will lead to a large-scale power transfer, causing AC channel overload and even power angle instability. Under the flexible AC / DC hybrid synchronous grid, how to fully utilize the control flexibility of flexible DC and achieve coordinated power support between zoning grids is of great significance. Summary of the Invention

[0003] This invention provides a power regulation method, device, medium, and product for AC / DC hybrid synchronous power grids. By generating an additional active power modulation signal based on the actual frequencies of the power grids on both the sending and receiving ends of the AC / DC hybrid synchronous power grid, it can solve the transient stability problem of AC / DC hybrid synchronous power grids under disturbances such as power deficit. Through precise regulation of DC power, it can achieve cross-regional power coordination and improve the transient stability of AC channels in flexible AC / DC hybrid synchronous power grids.

[0004] To achieve the above objectives, embodiments of the present invention provide a power regulation method for an AC / DC hybrid synchronous power grid, comprising: Real-time acquisition of the actual frequencies of the power grids on both the sending and receiving ends in a hybrid AC / DC synchronous power grid; Calculate the frequency deviation between the actual frequency of the two power grids and the rated frequency of the system; An additional active power modulation signal is generated based on the frequency deviation of the two power grids. An additional active power modulation signal is used to regulate the AC / DC hybrid synchronous power grid.

[0005] As an improvement to the above scheme, if the method further includes the following steps before generating an additional active power modulation signal based on the frequency deviation of the two power grids: Calculate the effective value of the frequency deviation between the two power grids based on the frequency deviation between the two power grids; The generation of the additional active power modulation signal based on the frequency deviation of the two power grids is as follows: If the effective value of the frequency deviation is greater than or equal to the preset dead zone threshold, an additional active power modulation signal is generated based on the effective value of the frequency deviation.

[0006] As an improvement to the above scheme, the step of calculating the effective value of the frequency deviation between the two power grids based on the frequency deviation between the two power grids includes: The effective value of the frequency deviation between the two power grids is calculated using the dead-zone function and the dead-zone correlation formula.

[0007] As an improvement to the above scheme, the method of adjusting the AC / DC hybrid synchronous power grid using an additional active power modulation signal includes: Based on the additional active power modulation signal and the original power reference value of the back-to-back flexible DC transmission system in the AC / DC hybrid synchronous grid, a new total power reference value is obtained. Based on the new total power reference value, the DC transmission power of the back-to-back flexible DC transmission system is adjusted for power regulation.

[0008] As an improvement to the above scheme, after adjusting the AC / DC hybrid synchronous power grid using an additional active power modulation signal, the method further includes: If the key parameters of the AC / DC hybrid synchronous power grid are detected to exceed the safety threshold, the additional active power modulation signal is reduced to slow down the power regulation speed.

[0009] As an improvement to the above scheme, after adjusting the AC / DC hybrid synchronous power grid using an additional active power modulation signal, the method further includes: The effectiveness of the additional active power modulation signal is verified using the complex torque coefficient method.

[0010] To achieve the above objectives, embodiments of the present invention provide a power regulation device for an AC / DC hybrid synchronous power grid, comprising: The actual frequency acquisition module is used to acquire the actual frequency of the power grids on both the sending and receiving ends in a hybrid AC / DC synchronous power grid in real time. The frequency deviation calculation module is used to calculate the frequency deviation between the actual frequency of the two power grids and the rated frequency of the system. The modulation signal generation module is used to generate an additional active power modulation signal based on the frequency deviation of the two power grids. The modulation signal conditioning module is used to regulate the AC / DC hybrid synchronous power grid by using an additional active power modulation signal.

[0011] To achieve the above objectives, embodiments of the present invention provide a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the power regulation method of the AC / DC hybrid synchronous power grid described above.

[0012] To achieve the above objectives, embodiments of the present invention also provide a computer-readable storage medium, the computer-readable storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to perform the above-described power regulation method for an AC / DC hybrid synchronous power grid.

[0013] To achieve the above objectives, embodiments of the present invention also provide a computer program product, which is stored in a storage medium and executed by at least one processor to implement the steps of the power regulation method for the AC / DC hybrid synchronous power grid described above.

[0014] Compared with existing technologies, the present invention discloses a power regulation method, device, medium, and product for an AC / DC hybrid synchronous power grid. This method involves real-time acquisition of the actual frequencies of the power grids on both the sending and receiving ends of the AC / DC hybrid synchronous power grid; calculation of the frequency deviation between the actual frequencies of the two power grids and the system's rated frequency; generation of an additional active power modulation signal based on the frequency deviation; and regulation of the AC / DC hybrid synchronous power grid using the additional active power modulation signal. Generating the additional active power modulation signal based on the actual frequencies of the power grids on both the sending and receiving ends allows for timely capture of dynamic frequency changes during power grid operation, enabling precise power regulation tailored to the current operating state of the power grid, thus improving the real-time performance and accuracy of regulation. It also achieves cross-regional power coordination in the AC / DC hybrid synchronous power grid, effectively solving the problem of cross-regional power imbalance. Furthermore, regulating the power grid using the additional active power modulation signal allows for rapid adjustment of DC power when the power grid is subjected to disturbances (such as DC blocking, load surges, etc.), thereby suppressing power oscillations, improving the transient power angle stability of the AC / DC hybrid synchronous power grid, and ensuring the safe and stable operation of the power grid under fault or disturbance conditions. Attached Figure Description

[0015] Figure 1 This is a schematic flowchart of a power regulation method for an AC / DC hybrid synchronous power grid provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the topology of a flexible AC / DC hybrid synchronous power grid provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the control module of a power regulation method for an AC / DC hybrid synchronous power grid provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of an equivalent model of a two-region AC / DC hybrid system provided in an embodiment of the present invention; Figure 5 This is a simulation result diagram of a power regulation method for an AC / DC hybrid synchronous power grid provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a power regulation device for an AC / DC hybrid synchronous power grid provided in an embodiment of the present invention; Figure 7 This is a structural block diagram of a terminal device provided in an embodiment of the present invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] It should be noted that the terms "comprising" and "specific" in this invention, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0018] Please see Figure 1 , Figure 1 This is a flowchart illustrating a power regulation method for an AC / DC hybrid synchronous power grid according to an embodiment of the present invention. The power regulation method for the AC / DC hybrid synchronous power grid includes: S1, real-time acquisition of the actual frequency of the power grids on both the sending and receiving ends in the AC / DC hybrid synchronous power grid; S2, calculate the frequency deviation between the actual frequency of the two power grids and the rated frequency of the system; S3, generate an additional active power modulation signal based on the frequency deviation of the two power grids; S4, using an additional active power modulation signal to regulate the AC / DC hybrid synchronous power grid.

[0019] Understandably, in traditional AC synchronous power grids, the system frequency response is primarily provided by the mechanical inertia of synchronous generators. After a disturbance, the frequency changes at each node are relatively consistent, and the inertial center frequency can typically be used to characterize the overall network frequency dynamics. However, with the increasing proportion of renewable energy generation, the power grid is entering a stage of complex AC / DC hybrid operation. The distribution of inertial resources and frequency regulation reserves in the system is becoming increasingly uneven, leading to significant differences in node frequencies at different geographical locations after a disturbance. This manifests as inconsistencies in the spatial distribution of indicators such as the rate of frequency change and the minimum point. This spatiotemporal distribution characteristic can be analyzed from the perspective of common-mode frequency and differential-mode frequency. Taking a multi-machine system power grid as an example, the expression for the closed-loop frequency response model of the system is: (1) Can The spectral decomposition is denoted as: (2) The eigenvalues ​​and eigenvectors are: (3) Substituting equations (2)-(3) into equation (1), we get the nodal frequency response. It can also be decomposed into n components: (4) In the formula, This is the hysteresis matrix, used to describe the frequency response characteristics under feedback. It is the identity matrix; These are coefficients related to system parameters (such as load frequency characteristics and unit inertia); The system's open-loop transfer function matrix; This is the load frequency characteristic matrix, used to describe how the load changes with frequency; For the Laplace operator; For the Laplace transform of the node frequency deviation vector; It is the Laplace transform vector of the disturbance power (such as sudden load changes or changes in unit output); , and They are respectively The Middle There are eigenvalues ​​and left and right eigenvectors, all of which are... The function is written with the first component separate because this component is special; This is the transpose identifier; the first component. The global frequency component shared by all nodes reflects the overall frequency dynamics of the system; the remaining components... This reflects the frequency differences between nodes and embodies the spatial distribution characteristics of the frequency response. This embodiment of the invention identifies and utilizes the short-term spatiotemporal differences in the AC system frequencies on both sides of a flexible DC tie line, and performs integral accumulation to achieve rapid coordination and support of cross-regional power.

[0020] For example, such as Figure 2 As shown, Figure 2 This is a schematic diagram of the topology of a flexible AC / DC hybrid synchronous power grid provided in an embodiment of the present invention. The flexible AC / DC hybrid synchronous power grid includes a sending-end AC power grid SG1 and a receiving-end AC power grid SG2, which are connected by an AC tie line (with reactance of...). It is connected to a back-to-back flexible DC transmission system (VSC-BTB), and the power modulation module is the core execution unit of the proposed control method (power regulation method for AC / DC hybrid synchronous power grid). It receives data from the sending end... and receiving end frequency deviation signal The difference between the actual frequency and the rated frequency is filtered by a filter; the power modulation module generates an additional DC power reference value based on the frequency deviation between the two sides. The data is transmitted to the outer loop control; the outer loop control then combines with the inner loop control to ultimately regulate the DC power of the flexible DC transmission system. It will also affect the power of the AC connection line. Converter transformer It may convert AC power into DC power and transmit it to DC transmission lines; converter transformer The DC power transmitted from the DC transmission line is converted into AC power by the converter valve, and then the AC voltage is transformed to a voltage level suitable for the AC system connected to the receiving end, so as to realize power coordination between the sending and receiving ends and improve the transient power angle stability of the AC-DC hybrid synchronous power grid.

[0021] The core of this invention lies in introducing a power modulation module (which executes the power regulation method of AC / DC hybrid synchronous power grid) on the basis of traditional control, so as to achieve system-level power sharing and stability improvement.

[0022] To achieve power mutual assistance and transient stability improvement between the sending and receiving ends of the system, the control structure of the power regulation method for the AC / DC hybrid synchronous power grid described in this embodiment of the invention is as follows: Figure 3 As shown, Figure 3This is a schematic diagram of the control module for a power regulation method in an AC / DC hybrid synchronous power grid according to an embodiment of the present invention. The control module deploys frequency sensors on the key bus of the sending-end AC power grid SG1 and the key bus of the receiving-end AC power grid SG2 to ensure that the measured signals reflect the true frequency dynamics of both power grids. It collects the actual frequencies of both the sending and receiving ends of the AC / DC hybrid synchronous power grid in real time, based on the frequency deviation between the two systems (the frequency deviation between the two power grids, such as the sending-end frequency deviation: ...). Receiving-end frequency deviation: An additional active power modulation signal (the increment of the active power reference value) is generated through a proportional-integral (PI) controller. This additional active power modulation signal is used to regulate the AC / DC hybrid synchronous power grid. The additional active power modulation signal output from the PI controller is transmitted to the active power control channel of the back-to-back flexible DC transmission system (VSC-BTB), and superimposed with the original power reference value of the VSC-BTB to obtain a new total power reference value. Based on the new total power reference value, the VSC-BTB adjusts the trigger pulses of its converter valves, changing the DC transmission power on the DC side to achieve bidirectional power exchange across regions. For example, when the receiving end frequency deviation is positive (power deficit) and the sending end frequency deviation is negative (power surplus), the increment of the active power reference value is positive, the DC transmission power increases, and the sending end transmits more power to the receiving end to fill the receiving end deficit. During power modulation, key parameters are continuously monitored, including the sending and receiving end frequencies, DC transmission power, AC tie-line power, and system power angle difference (i.e., the power angle difference between the equivalent generators at the sending and receiving ends) to ensure system stability. If any parameter exceeds a safety threshold (e.g., the system power angle difference approaches the instability threshold, or the DC transmission power exceeds the rated capacity of the DC system), the KP value of the PI controller is temporarily reduced to slow down the power regulation speed and prevent excessive system response that could lead to new stability problems. Without considering the dead-band, the increment of the active power reference value can be expressed as: (5) In the formula, and These are proportional gain and integral gain, respectively. and This is the actual frequency measurement value. This is the system's rated frequency.

[0023] This invention provides real-time acquisition of the actual frequencies of the sending-end AC grid and the receiving-end AC grid, calculation of the deviations between the two sides and the system's rated frequencies, and capture of frequency spatiotemporal differences; generation of an additional power signal to achieve dynamic calculation of power regulation; injection of the additional active power modulation signal into the back-to-back flexible DC transmission system, and rapid adjustment of cross-regional power through DC tie lines to achieve bidirectional power mutual assistance between the sending and receiving ends and suppress AC channel power oscillations.

[0024] Furthermore, if the method further includes the following steps before step S3: S301, Calculate the effective value of the frequency deviation between the two power grids based on the frequency deviation between the two power grids; Then step S3 is: S31, if the effective value of the frequency deviation is greater than or equal to the preset dead zone threshold, then an additional active power modulation signal is generated based on the effective value of the frequency deviation.

[0025] For example, to avoid the controller entering a full-bias state and triggering unnecessary power regulation due to inherent measurement errors in the frequencies of the two power grids (such as small frequency fluctuations caused by sensor accuracy deviations), dead-zone filtering of the frequency deviation signal is required: A preset frequency dead-zone range is established based on the actual operating characteristics of the power grid (the specific value can be dynamically adjusted according to system inertia and frequency modulation capability); the frequency deviation of the two power grids is processed by a dead-zone function to obtain the effective value of the frequency deviation. If the absolute value of the effective frequency deviation is less than a preset dead-zone threshold, it is determined to be an invalid deviation and no subsequent power regulation is triggered; if the absolute value of the effective frequency deviation is greater than or equal to the preset dead-zone threshold, it is determined to be a valid deviation, and an additional active power modulation signal is generated based on the frequency deviation of the two power grids. This embodiment of the invention smooths the effective deviation signal to avoid signal abrupt changes causing controller output oscillations.

[0026] Specifically, step S301 includes: S3011, the effective value of the frequency deviation of the two power grids is calculated using the dead zone function and the dead zone correlation formula based on the frequency deviation of the two power grids.

[0027] To avoid the controller from being fully biased due to inherent measurement deviations on both sides of the frequency, a frequency dead-time function is incorporated into the controller. The dead-time function is as follows: (6) Dead zone correlation formula The expression is: (7) In the formula, This is the frequency signal (effective value of frequency deviation) obtained after dead-time processing and used for subsequent control logic. The original measured frequency deviation signal after filtering and other processing is the basis for subsequent dead zone judgment and processing; The preset dead zone threshold is used to determine whether the original measurement frequency deviation signal needs to be processed. When the absolute value of the original signal is less than the threshold, it is considered to be a small fluctuation and no additional adjustment is made. and These are proportional coefficients related to the frequency deviation at the sending end and the frequency deviation at the receiving end, used to proportionally adjust the frequency deviation signals on both sides by amplifying or reducing them. and These are the time constants related to the filtering of frequency deviation signals at the sending and receiving ends, respectively, used to filter the frequency deviation and eliminate interference such as high-frequency noise.

[0028] Specifically, step S4 includes: Based on the additional active power modulation signal and the original power reference value of the back-to-back flexible DC transmission system in the AC / DC hybrid synchronous grid, a new total power reference value is obtained. Based on the new total power reference value, the DC transmission power of the back-to-back flexible DC transmission system is adjusted for power regulation.

[0029] For example, the additional active power modulation signal output by the PI controller is transmitted to the active power control channel of the back-to-back flexible DC transmission system (VSC-BTB) and superimposed on the original power reference value of VSC-BTB to obtain a new total power reference value. According to the instruction of the new total power reference value, VSC-BTB adjusts the trigger pulse of its converter valve to change the DC transmission power on the DC side, so as to realize bidirectional mutual assistance of cross-regional power. For example, when the frequency deviation at the receiving end is positive (power deficit) and the frequency deviation at the sending end is negative (power surplus), the increment of the active power reference value is positive, the DC transmission power increases, and the sending end transmits more power to the receiving end to fill the deficit at the receiving end.

[0030] Furthermore, after adjusting the AC / DC hybrid synchronous power grid using an additional active power modulation signal, the method further includes: S5. If the key parameters of the AC / DC hybrid synchronous power grid are detected to exceed the safety threshold, the additional active power modulation signal is reduced to slow down the power regulation speed.

[0031] For example, during power modulation, key parameters are continuously monitored, including the sending and receiving end frequencies, DC transmission power, AC tie-line power, and system power angle difference (i.e., the power angle difference between the equivalent generator at the sending end and the equivalent generator at the receiving end), to ensure system stability. If the monitored parameters exceed the safety threshold (such as the system power angle difference approaching the instability critical value or the DC transmission power exceeding the rated capacity of the DC system), the KP value of the PI controller is temporarily reduced to slow down the power regulation speed and avoid system over-response leading to new stability problems.

[0032] Furthermore, after adjusting the AC / DC hybrid synchronous power grid using an additional active power modulation signal, the method further includes: S6. The effectiveness of the additional active power modulation signal is verified by using the complex torque coefficient method.

[0033] For example, to analyze the effect of the additional active power modulation signal on the system's power angle stability, such as... Figure 4 As shown, Figure 4 This is a schematic diagram of an equivalent model of a two-region AC / DC hybrid system provided in an embodiment of the present invention. Region 1 and Region 2 are respectively represented by equivalent generators. , and load , This indicates that the DC tie line transmission power is... Area 1 consists of generators. and corresponding load Equivalently, region 2 consists of generators and corresponding load Equivalent DC transmission power The electromotive force of region 1 is The electromotive force of region 2 is The phase of the bus voltage in region 1 is The phase of the bus voltage in region 2 is .

[0034] The generator adopts a second-order model, and the equivalent generator rotor motion equations on both sides of the two-region AC / DC hybrid system are: (8) Equivalent values ​​are applied to the two machine systems described above, and the following can be obtained: (9) In the formula, The moment of inertia of the delivery system (first region); The power angle of the equivalent generator in the sending-end system; Synchronous angular velocity; The mechanical power of the equivalent generator in the sending-end system; The power transmitted from the sending end to the receiving end of the AC tie line; The power transmitted from the sending end to the receiving end of a DC system (DC transmission power). The load power of the sending-end system; The moment of inertia of the receiving system (second region); The power angle of the equivalent generator in the receiving-end system; The mechanical power of the equivalent generator in the receiving-end system; This represents the load power of the receiving-end system.

[0035] The equivalent mechanical power of the AC / DC flexible hybrid system in two regions is the power angle difference between the two ends of the DC line. for: (10) Equivalent electromagnetic power for: (11) The expression is: (12) Equivalent electromagnetic power Substituting into formula (9), we get: (13) The additional control used for DC transmission is as follows: (14) After introducing a DC additional power modulation signal, the equivalent electromagnetic power includes an additional control term. Substituting this into the equivalent motion equation yields: (15) In the formula, The power angle difference between the two ends of the DC line system; Equivalent mechanical power for a two-region AC / DC flexible hybrid system; The equivalent electromagnetic power of a two-region AC / DC flexible hybrid system; The equivalent inertial time constant of the sending system; The equivalent inertial time constant of the receiving system; The comprehensive equivalent inertia coefficient is related to the equivalent inertia time constant of the sending and receiving systems; The voltage of the sending-end system; The voltage of the receiving end system; Reactance of the AC tie line; This represents the frequency difference between the sending and receiving systems.

[0036] Analysis shows that the power regulation method of the AC / DC hybrid synchronous power grid not only provides additional synchronous torque and enhances the system's power angle stability, but also introduces damping torque to effectively suppress power oscillations between the two systems.

[0037] A simulation system was built using DSP simulation software to simulate a conventional DC blocking scenario. The power regulation method used was compared with a dual-sided FLC method to demonstrate that the proposed power regulation method can effectively enhance the transient power angle stability of the system under large disturbances. Simulation results are shown below. Figure 5 As shown, Figure 5 This is a simulation result diagram of a power regulation method for an AC / DC hybrid synchronous power grid provided in an embodiment of the present invention. Figure 5 Simulation results show that under DC blocking faults, without additional active power modulation signal control (global control), the active power in the AC channel oscillates, indicating system synchronization instability. Introducing additional active power modulation signal control prevents this from occurring. Therefore, implementing additional active power modulation signal control can improve the transient power angle stability boundary of the outer loop AC section.

[0038] This invention discloses a power regulation method for an AC / DC hybrid synchronous power grid. The method involves real-time acquisition of the actual frequencies of the power grids at both the sending and receiving ends; calculation of the frequency deviation between the actual frequencies of the two power grids and the system's rated frequency; generation of an additional active power modulation signal based on the frequency deviation; and regulation of the AC / DC hybrid synchronous power grid using the additional active power modulation signal. By actively utilizing the rapid power regulation capability of the DC tie line, bidirectional power mutual assistance is achieved. Simultaneously modulating the power, this is equivalent to providing the system with additional synchronous torque and damping torque, enhancing the system's transient power angle stability.

[0039] See Figure 6 , Figure 6 This is a schematic diagram of the structure of a power regulation device 10 for an AC / DC hybrid synchronous power grid according to an embodiment of the present invention. The power regulation device 10 for the AC / DC hybrid synchronous power grid includes: The actual frequency acquisition module 11 is used to acquire the actual frequency of the power grids on both the sending and receiving ends in a hybrid AC / DC synchronous power grid in real time. Frequency deviation calculation module 12 is used to calculate the frequency deviation between the actual frequency of the two power grids and the rated frequency of the system. The modulation signal generation module 13 is used to generate an additional active power modulation signal based on the frequency deviation of the two power grids. The modulation signal conditioning module 14 is used to regulate the AC / DC hybrid synchronous power grid by using an additional active power modulation signal.

[0040] Furthermore, the power regulation device 10 of the AC / DC hybrid synchronous power grid also includes: The key parameter monitoring module is used to reduce the additional active power modulation signal to slow down the power regulation speed if the key parameters of the AC / DC hybrid synchronous power grid exceed the safety threshold.

[0041] Furthermore, the power regulation device 10 of the AC / DC hybrid synchronous power grid also includes: The signal validity verification module is used to verify the validity of the additional active power modulation signal using the complex torque coefficient method.

[0042] The power regulation device 10 for AC / DC hybrid synchronous power grid provided in this embodiment of the invention can realize all the processes of the power regulation method for AC / DC hybrid synchronous power grid in the above embodiment. The functions and technical effects of each module in the device are the same as those of the power regulation method for AC / DC hybrid synchronous power grid in the above embodiment, and will not be repeated here.

[0043] See Figure 7 , Figure 7 This is a schematic diagram of the structure of a terminal device 20 provided in an embodiment of the present invention. The terminal device 20 of this embodiment includes: a processor 21, a memory 22, and a computer program stored in the memory 22 and executable on the processor 21. When the processor 21 executes the computer program, it implements the steps in the above-described embodiment of the power regulation method for AC / DC hybrid synchronous power grids. Alternatively, when the processor 21 executes the computer program, it implements the functions of each module in the above-described embodiment of the power regulation device for AC / DC hybrid synchronous power grids.

[0044] For example, the computer program may be divided into one or more modules, which are stored in the memory 22 and executed by the processor 21 to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in the terminal device 20.

[0045] The terminal device 20 can be a desktop computer, laptop, handheld computer, cloud server, or other computing device. The terminal device 20 may include, but is not limited to, a processor 21 and a memory 22. Those skilled in the art will understand that the schematic diagram is merely an example of the terminal device 20 and does not constitute a limitation on the terminal device 20. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal device 20 may also include input / output devices, network access devices, buses, etc.

[0046] The processor 21 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor. The processor 21 is the control center of the terminal device 20, connecting all parts of the terminal device 20 via various interfaces and lines.

[0047] The memory 22 can be used to store the computer programs and / or modules. The processor 21 implements various functions of the terminal device 20 by running or executing the computer programs and / or modules stored in the memory 22 and calling the data stored in the memory 22. The memory 22 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, phonebook, etc.). In addition, the memory 22 may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0048] If the modules integrated in the terminal device 20 are implemented as software functional units and sold or used as independent products, they 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 the processor 21, 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 the 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, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0049] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0050] This invention also provides a computer-readable storage medium, which includes a stored computer program, wherein the computer program, when running, controls the device where the computer-readable storage medium is located to perform the power regulation method of the AC / DC hybrid synchronous power grid as described in the above embodiments.

[0051] Furthermore, embodiments of the present invention also provide a computer program product, which is stored in a storage medium and executed by at least one processor to implement the steps of the power regulation method for the AC / DC hybrid synchronous power grid described in the above embodiments.

[0052] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A power regulating method for an AC / DC hybrid synchronous power grid, characterized in that, The method comprises: real-time acquisition of actual frequencies of power grids on both sending and receiving sides of an AC-DC hybrid synchronous power grid; calculation of frequency deviations of the actual frequencies of the power grids on both sides from a system rated frequency; generation of an additional active power modulation signal according to the frequency deviations of the power grids on both sides; adjustment of the AC-DC hybrid synchronous power grid by using the additional active power modulation signal.

2. The power regulating method of the AC-DC hybrid synchronous grid of claim 1, wherein, If the additional active power modulation signal is generated according to the frequency deviations of the power grids on both sides, the method further comprises: calculation of an effective value of the frequency deviations of the power grids on both sides according to the frequency deviations of the power grids on both sides; the generation of the additional active power modulation signal according to the frequency deviations of the power grids on both sides is: If the effective value of the frequency deviations is greater than or equal to a preset dead zone threshold, the additional active power modulation signal is generated according to the effective value of the frequency deviations.

3. The power regulating method of the AC-DC hybrid synchronous grid according to claim 2, characterized in that, The calculation of the effective value of the frequency deviations of the power grids on both sides according to the frequency deviations of the power grids on both sides comprises: calculation of the effective value of the frequency deviations of the power grids on both sides by using a dead zone function and a dead zone correlation formula according to the frequency deviations of the power grids on both sides.

4. The power regulating method of the AC-DC hybrid synchronous grid of claim 1, wherein, The adjustment of the AC-DC hybrid synchronous power grid by using the additional active power modulation signal comprises: obtaining a new total power reference value according to the additional active power modulation signal and an original active power reference value of a back-to-back flexible DC power transmission system in the AC-DC hybrid synchronous power grid; adjusting a DC transmission power of the back-to-back flexible DC power transmission system according to the new total power reference value to perform power adjustment.

5. The power regulating method of the AC-DC hybrid synchronous grid of claim 1, wherein, After the adjustment of the AC-DC hybrid synchronous power grid by using the additional active power modulation signal, the method further comprises: If it is monitored that a key parameter of the AC-DC hybrid synchronous power grid exceeds a safety threshold, the additional active power modulation signal is reduced to slow down the power adjustment speed.

6. The power regulating method of the AC / DC hybrid synchronous grid of claim 1, wherein, After the adjustment of the AC-DC hybrid synchronous power grid by using the additional active power modulation signal, the method further comprises: validity verification of the additional active power modulation signal by using a complex torque coefficient method.

7. A power regulating device for an AC / DC hybrid synchronous power grid, characterized in that The method comprises: an actual frequency acquisition module configured to acquire actual frequencies of power grids on both sending and receiving sides of an AC-DC hybrid synchronous power grid in real time; a frequency deviation calculation module configured to calculate frequency deviations of the actual frequencies of the power grids on both sides from a system rated frequency; a modulation signal generation module configured to generate an additional active power modulation signal according to the frequency deviations of the power grids on both sides; and a modulation signal adjustment module configured to adjust the AC-DC hybrid synchronous power grid by using the additional active power modulation signal.

8. A terminal device, characterized by comprising: The computer readable storage medium comprises a stored computer program, wherein the computer readable storage medium controls a device where the computer readable storage medium is located to perform the power adjustment method of the AC-DC hybrid synchronous power grid according to any one of claims 1-6 when the computer program runs.

9. A computer-readable storage medium, characterized in that, ​ 10. A computer program product, characterised in that, The computer program product is stored in a storage medium, and the program product is executed by at least one processor to implement the steps of the power regulation method of the AC-DC hybrid synchronous power grid according to any one of claims 1-6.

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