Voltage regulation method and system for extra-high voltage AC-DC hybrid power grid external transmission system

Abstract

The disclosure provides a voltage regulation method and system for an extra-high voltage AC-DC hybrid power grid external transmission system, including the following steps: obtaining circuit parameters of a power transmission line, identifying the influence of DC channel and AC channel faults on AC voltage fluctuation; setting the influence weight of DC channel and AC channel faults on AC voltage fluctuation according to the identification result; setting the amplitude of voltage regulation according to the influence weight, so that the AC-DC hybrid power grid system has voltage within the set range when a fault occurs. By identifying the influence of DC channel and AC channel faults on AC voltage fluctuation, the voltage can be regulated accordingly, so that the voltage is within the required range, and the system voltage is not insufficient due to the influence of the fault, affecting the power transmission efficiency of the extra-high voltage system.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of extra-high voltage power transmission control, in particular to an extra-high voltage AC-DC hybrid power grid external sending system voltage regulation method and system. BACKGROUND

[0002] The power system connects power production and consumption, is the central link of energy transformation, and is one of the main battlefields to achieve the carbon peak and carbon neutralization target. China has a vast territory, and the energy resources and consumption are inversely distributed, with 76% of coal distributed in the north and northwest, 80% of wind energy distributed in the western and northern regions, 80% of water energy distributed in the southwest, and 70% of solar energy resources mainly distributed in the western and northern regions. The power load in China is mainly distributed in the economically developed eastern regions. The inverse distribution of energy resources and power load makes it necessary for China to carry out large-scale long-distance power transmission.

[0003] Extra-high voltage AC-DC power transmission is the main way of large-scale long-distance power transmission, and China has basically formed an AC-DC hybrid power grid with high-voltage transmission as the backbone network. The AC-DC hybrid transmission system can not only exert the respective advantages of DC and AC, but also improve the power transmission capacity, and is beneficial to the safe and stable operation of the power grid. However, in the AC-DC hybrid transmission system, whether it is DC channel blocking or AC channel failure, it will have a great impact on the AC system voltage. There are many influencing factors related to the AC system and DC system, power flow distribution, and starting mode, and the current voltage control method calculates by finding possible faults, the theoretical research depth and achievements are still far from enough, which cannot ensure comprehensiveness and cannot accurately regulate the system voltage, affecting the safe operation of the extra-high voltage AC-DC transmission system. SUMMARY

[0004] In order to solve the above problems, the present disclosure provides an extra-high voltage AC-DC hybrid power grid external sending system voltage regulation method and system, which identifies the AC bus with the largest voltage drop amplitude under the same power transfer and the DC system with the greatest impact on the same AC bus voltage, sets the voltage adjustment amplitude according to the impact size, improves the accuracy of the control of the steady-state operating voltage of the extra-high voltage AC-DC hybrid power grid, and has important significance for the safe and stable operation of the AC-DC hybrid system.

[0005] In order to achieve the above purpose, the present disclosure adopts the following technical solutions:

[0006] One or more embodiments provide an extra-high voltage AC-DC hybrid power grid external sending system voltage regulation method, comprising the following steps:

[0007] Obtain the circuit parameters of the power transmission line, and identify the influence of DC channel and AC channel failure on AC voltage fluctuation;

[0008] According to the identification result, the influence weight of the DC channel and the AC channel fault on the AC voltage fluctuation is set;

[0009] According to the influence weight, the amplitude of the voltage regulation is set, so that the voltage of the AC-DC hybrid power grid system is within the set range when the fault occurs.

[0010] One or more embodiments provide a voltage regulation system for an ultra-high voltage AC-DC hybrid power grid external transmission system, comprising:

[0011] The identification module is configured to obtain the circuit parameters of the transmission line, and identify the influence of the DC channel and the AC channel fault on the AC voltage fluctuation;

[0012] The influence weight setting module is configured to set the influence weight of the DC channel and the AC channel fault on the AC voltage fluctuation according to the identification result;

[0013] The adjustment module is configured to set the amplitude of the voltage regulation according to the influence weight, so that the voltage of the AC-DC hybrid power grid system is within the set range when the fault occurs.

[0014] An electronic device includes a memory and a processor, and computer instructions stored on the memory and running on the processor, when the computer instructions are run by the processor, the steps of the above method are completed.

[0015] A computer readable storage medium for storing computer instructions, when the computer instructions are executed by a processor, the steps of the above method are completed.

[0016] Compared with the prior art, the beneficial effects of the present disclosure are:

[0017] The present disclosure can regulate the voltage by identifying the influence of the DC channel and the AC channel fault on the AC voltage fluctuation, so that the voltage is within the required range, and the system voltage is not insufficient due to the influence of the fault, which affects the power transmission efficiency of the ultra-high voltage system.

[0018] The advantages of the additional aspects of the present disclosure will be partially given in the following description, partially will become apparent from the following description, or will be understood by the practice of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings accompanying the specification of the present disclosure serve to provide a further understanding of the present disclosure, the illustrative embodiments of the present disclosure and their descriptions serve to explain the present disclosure, and do not constitute a limitation of the present disclosure.

[0020] Figure 1 is the voltage regulation method flowchart of embodiment 1 of the present disclosure;

[0021] Figure 2is a model of an AC / DC parallel power transmission system of Embodiment 1 of the present disclosure;

[0022] Figure 3 is a model of an AC / DC non-parallel power transmission system of Embodiment 1 of the present disclosure;

[0023] Figure 4 is a simplified model of an AC channel of Embodiment 1 of the present disclosure;

[0024] Figure 5 is a first voltage drop vector diagram of Embodiment 1 of the present disclosure;

[0025] Figure 6 is a second voltage drop vector diagram of Embodiment 1 of the present disclosure;

[0026] Figure 7 is an example modeling diagram of Embodiment 1 of the present disclosure;

[0027] Figure 8 is a model of Ximeng regional power grid of Embodiment 1 of the present disclosure;

[0028] Figure 9 is an example influence of DC bipolar blocking on AC bus voltage of the example system of Embodiment 1 of the present disclosure;

[0029] Figure 10 is an example influence of AC open-line fault on AC bus voltage of the example system of Embodiment 1 of the present disclosure. DETAILED DESCRIPTION

[0030] The present disclosure will be further described below with reference to the drawings and embodiments.

[0031] It should be noted that the following detailed description is merely exemplary in nature and is intended to provide further description of the present disclosure. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0032] It should be noted that the terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit exemplary embodiments according to the present disclosure. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used herein indicate the presence of a feature, step, operation, device, component, and / or combination thereof. It should be noted that the various embodiments and features in the present disclosure can be combined with each other without conflict, and the embodiments will be described in detail below with reference to the accompanying drawings.

[0033] Embodiment 1

[0034] In the technical solutions disclosed in one or more embodiments, such asFigure 1 As shown, the voltage control method of the ultra-high voltage AC / DC hybrid power grid transmission system includes the following steps:

[0035] Step 1: Obtain the circuit parameters of the transmission line and identify the impact of DC channel and AC channel faults on AC voltage fluctuations;

[0036] Step 2: Set the weights of the impact of DC channel and AC channel faults on AC voltage fluctuations based on the identification results;

[0037] Step 3: Set the voltage control amplitude according to the impact weight so that the voltage of the AC / DC hybrid power grid system is within the set range when a fault occurs.

[0038] This embodiment identifies the impact of DC channel and AC channel faults on AC voltage fluctuations, and can regulate the voltage in a targeted manner so that the voltage is within the required range. This prevents the system voltage from being insufficient due to the impact of the fault, thereby affecting the transmission efficiency of the UHV system.

[0039] In step 1, the circuit parameters of the transmission line are obtained, including the transmitted active power P, reactive power Q, line resistance R, and line equivalent impedance X.

[0040] In step 1, the method for identifying the impact of DC channel and AC channel faults on AC voltage fluctuations can be specifically as follows:

[0041] Step 11, simplifying the mathematical model of the AC / DC hybrid power transmission system;

[0042] The mathematical model of AC / DC hybrid transmission system can be divided into AC / DC parallel transmission system model and non-parallel transmission system model.

[0043] AC / DC parallel transmission system model, such as Figure 2 As shown. Among them, A is the sending end AC system, P dc is the DC transmission power, P ac is the AC transmission power, and B is the infinite system at the receiving end.

[0044] AC / DC non-parallel transmission system model Figure 3 As shown, where A is the sending end AC system, P dc is the DC transmission power, P ac is the AC transmission power, B is the infinite system at the receiving end of the DC transmission channel, and C is the infinite system at the receiving end of the AC transmission channel.

[0045] Depend on Figure 2 and Figure 3 It can be seen that no matter the AC / DC parallel or non-parallel transmission system model, after the DC channel is blocked, its transmission power will be transferred to the AC channel, causing the AC channel power flow to increase and the voltage along the line to drop.

[0046] Optionally, the AC channel lumped parameter simplification in the AC-DC hybrid power transmission system model is as follows: Figure 4 As shown in the figure, the AC channel lumped parameter simplification model, the transmission line impedance is Z = R + jX, the line head voltage is The line end voltage is The line current is The line head power is S1 = P1 + jQ1, the line end power is S1 = P2 + jQ2, and the line voltage drop is:

[0047]

[0048] Step 12, according to the transmission line head voltage is much larger than the voltage drop, obtain the relationship between the AC bus voltage drop and the line parameters when the DC is blocked or the surplus power is transferred.

[0049] The voltage drop is decomposed into a longitudinal component in the same direction as a transverse component perpendicular to The vector diagram is as shown in the figure: Figure 5

[0050]

[0051] The voltage drop of the line can be expressed as:

[0052]

[0053] Express the current in terms of the phase power, that is:

[0054]

[0055] Substitute the power for the current, according to formula (2) to obtain:

[0056]

[0057] Figure 4 It can be seen that:

[0058] Then the relationship between the line end voltage amplitude U2 and the line parameters and the line transmission power is:

[0059]

[0060] In the formula, The active power P, the reactive power Q, the line equivalent resistance R, and the line equivalent reactance X that the line can transmit.

[0061] When U1 >> ΔU1 and U1 >> σU1 are set, formula (7) can be simplified as:

[0062] ​

[0063] It can be seen that the greater the line parameters R, X and transmission power P, Q, the faster the terminal voltage amplitude drops.

[0064] When DC blocking or surplus power transfer occurs, P in the equivalent transmission power increases, and from equations (8) and (5), we can know that:

[0065]

[0066] It can be seen that the relationship between the AC bus voltage drop and the line parameters is that the greater the equivalent resistance R from the converter bus to the AC bus, the greater the AC bus voltage drop caused by DC blocking or surplus power transfer.

[0067] Step 13, according to the line terminal voltage being much greater than the voltage drop, the relationship between the AC bus voltage drop and the line transmission reactive power and the ratio of the head voltage is obtained when the AC line breakage fault occurs.

[0068] The voltage drop vector is decomposed into a longitudinal component in the same direction as a transverse component perpendicular to it. The vector diagram is shown in Figure 6 .

[0069]

[0070] The voltage drop of the line can be expressed as:

[0071]

[0072] Expressing the current in terms of phase power, i.e.

[0073]

[0074] Substituting power for current, equation (10) can be rewritten as:

[0075]

[0076] The relationship between the head voltage amplitude U1 and the line parameters and the transmission power is as follows:

[0077]

[0078] Simplify as:

[0079]

[0080] It can be seen that the greater the line parameters equivalent resistance R, line equivalent reactance X and transmission power active power P, reactive power Q, the faster the head voltage amplitude rises.

[0081] When the AC fault occurs, the line equivalent reactance X changes, and from formula (16) and formula (13), we can know that:

[0082]

[0083] The relationship between the AC bus voltage drop and the line transmission reactive power and the first end voltage ratio is that the greater the line transmission reactive power and the first end voltage ratio, the greater the line first end voltage rise caused by the AC line break fault.

[0084] Step 2, a method for setting the influence weight of the AC voltage fluctuation caused by the DC channel and the AC channel fault according to the identification result, specifically:

[0085] For the voltage adjustment control of the steady-state voltage drop at the end of the AC line, the setting of the influence weight is specifically: the influence weight is set from large to small according to the equivalent resistance R of the AC bus, that is, the greater the equivalent resistance, the greater the influence weight set;

[0086] For the voltage adjustment control of the steady-state voltage rise at the first end of the AC line, the setting of the influence weight is specifically set from large to small according to the line transmission reactive power and the first end voltage ratio, that is, the greater the line transmission reactive power and the first end voltage ratio, the greater the influence weight set.

[0087] In step 3, the amplitude of voltage regulation is set according to the influence weight, that is, the greater the influence weight, the greater the amplitude of voltage regulation, so that the corresponding adjustment amplitude is output for each line, so that the voltage of the entire system can be within the set range.

[0088] To illustrate the effect of the embodiment, the above method is described below with a specific example.

[0089] Ximeng area is wide and sparsely populated, with rich coal and wind power resources, suitable for large-scale development and construction of coal and wind power bases. At present, the system with this end as the sending end has built two large cross-regional power transmission projects, "Ximeng-Taizhou ± 800kV UHV DC" and "Ximeng-Shandong UHV AC", forming a UHV AC and DC hybrid power grid.

[0090] Based on the PSASP software, the UHV AC and DC hybrid power grid in Ximeng area is modeled. The PSASP software provides commonly used models of power systems such as synchronous generators, excitation regulators, prime mover governors, PSS, induction motors, and comprehensive dynamic loads, static loads, static var compensators, and DC transmission, and has a platform for integrated support of diagrams and models. By calling component models, entering data, and performing power flow calculation, a regional power grid model can be formed, as shown in Figure 6 .

[0091] The synchronous generator adopts E″ q , E″d , E' q , E' d The 6th order synchronous machine model is changed in potential, and the functions of the excitation regulation system and the speed regulation system are considered; the wind driven generator adopts the 1st type double-fed wind driven generator or the 1st type direct-driven wind driven generator, the wind wheel and control model, the converter electrical control model, and the generator / converter model are refined, and the high / low voltage ride-through protection function is considered; the transformer adopts the Γ type equivalent model; the AC transmission line adopts the Π type equivalent model; the DC transmission system adopts the 5th type DC transmission system model, i.e. the quasi-steady state model with actual regulator; the load adopts the 50% constant impedance+50% induction motor model. The actual modeling can form a network structure as shown in Figure 7 The "Ximeng-Shandong UHV AC transmission project" starts from the Shengli UHV substation, passes through the Shengxi double circuit line, the Xilang double circuit line, and the Langhe double circuit line, and ends at the Quancheng substation in Shandong; the "Ximeng-Taizhou UHV DC transmission project" starts from the Xilinhot converter station and ends at the Taizhou converter station in Jiangsu Province, and is connected to the Shengli UHV substation through the Shenglin three-circuit line.

[0092] In the system full wiring and Ximeng-Taizhou DC transmission power of 1300 MW operation mode, if the Ximeng-Taizhou DC occurs bipolar blocking, the voltage changes of Ximeng, Langfang, and Hahe are monitored, and the bus voltage change curves of different UHV stations are as shown in Figure 8 .

[0093] The Ximeng-Taizhou DC bipolar blocking, the maximum steady-state voltage drop of Hahe, followed by Langfang, and the minimum of Ximeng, that is, the greater the equivalent resistance from the converter bus to the AC bus, the greater the voltage drop of the AC bus caused by the DC blocking. The adjustment voltage set by the Hahe steady-state voltage drop is the largest, followed by Langfang, and the smallest in Ximeng, and the voltage will not drop below the set range.

[0094] In the system full wiring, the ratio of AC transmission reactive power to the head voltage is 0.283, 0.316, and 0.346, respectively, and if the Ximeng side of Shengxi I line occurs a line breaking fault, the voltage change of Shengli station is monitored, and the bus voltage change curves of Shengli UHV station under different line transmission reactive power to head voltage ratio conditions are as shown in Figure 9 . When the line transmission reactive power to head voltage ratio is 0.283, 0.316, and 0.346, respectively, the line head steady-state voltage rise is 14.32 kV, 16.19 kV, and 17.49 kV, respectively, when the AC single-circuit line breaking fault occurs, therefore, the greater the line transmission reactive power to head voltage ratio, the greater the line head voltage rise when the AC single-circuit line breaking fault occurs.

[0095] It can be seen that, in the embodiment, the influence weight is set according to the relationship between the fault and the line parameters, the adjustment voltage amplitude of the line can be reasonably adjusted, and the stability of voltage control can be improved.

[0096] Embodiment 2

[0097] Based on embodiment 1, the embodiment provides a voltage regulation system of an extra-high voltage AC-DC hybrid power grid external transmission system, comprising:

[0098] The identification module is configured to obtain the circuit parameters of the power transmission line, and identify the influence of the DC channel and AC channel faults on the AC voltage fluctuation.

[0099] The influence weight setting module is configured to set the influence weight of the DC channel and AC channel faults on the AC voltage fluctuation according to the identification result.

[0100] The adjustment module is configured to set the amplitude of the voltage regulation according to the influence weight, so that the voltage of the AC-DC hybrid power grid system is within the set range when a fault occurs.

[0101] The embodiment provides an electronic device, comprising a memory and a processor, and computer instructions stored in the memory and running on the processor, when the computer instructions are run by the processor, the steps of the method of embodiment 1 are completed.

[0102] Embodiment 4

[0103] The embodiment provides a computer readable storage medium for storing computer instructions, when the computer instructions are executed by the processor, the steps of the method of embodiment 1 are completed.

[0104] The electronic device proposed in the present disclosure can be a mobile terminal and a non-mobile terminal, the non-mobile terminal includes a desktop computer, and the mobile terminal includes a smart phone (such as an Android phone, an IOS phone, etc.), smart glasses, a smart watch, a smart bracelet, a tablet computer, a notebook computer, a personal digital assistant, etc. Mobile Internet devices that can perform wireless communication.

[0105] It should be understood that in the present disclosure, the processor can be a central processing unit CPU, and the processor can also be other general-purpose processors, digital signal processors DSP, application-specific integrated circuits ASIC, ready-to-program gate arrays FPGA or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0106] The memory can include read-only memory and random access memory, and provide instructions and data to the processor, a part of the memory can also include non-volatile random access memory. For example, the memory can also store device type information.

[0107] In the implementation process, each step of the above method can be completed by integrated logic circuit of hardware in the processor or instructions in the form of software. The steps of the method disclosed in combination with the present disclosure can be directly embodied as execution completed by a hardware processor, or executed by a combination of hardware and software modules in the processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, register, etc. The storage medium is located in the memory, and the processor reads the information in the memory to complete the steps of the above method in combination with the hardware thereof. To avoid repetition, it will not be described in detail here. Those skilled in the art can realize that the units of each example described in combination with the embodiments disclosed herein, i.e. the algorithm steps, can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are executed in hardware or software mode depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present disclosure.

[0108] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0109] In several embodiments provided by the present disclosure, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are merely schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be omitted or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0110] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present disclosure, essentially or in part, or parts contributing to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions for making a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present disclosure. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, and various other media that can store program codes.

[0111] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

[0112] Although the specific embodiments of the present disclosure are described above in combination with the drawings, they are not intended to limit the protection scope of the present disclosure. Those skilled in the art should understand that various modifications or changes made on the basis of the technical solutions of the present disclosure without creative labor are still within the protection scope of the present disclosure.

Claims

1. A voltage regulation method for an extra-high voltage AC-DC hybrid power grid external transmission system, characterized in that, The method comprises the following steps: obtaining circuit parameters of the transmission line, and identifying influences of DC channel and AC channel faults on AC voltage fluctuation; wherein: the influence of the DC channel on the AC voltage fluctuation specifically comprises: simplifying a mathematical model of the AC-DC hybrid power transmission system; according to the simplified model, and according to the fact that the voltage at the head of the transmission line is much greater than the voltage drop, the relationship between the voltage drop of the AC bus and the line parameters when the DC is blocked or surplus power is transferred is obtained; the influence of the AC channel on the AC voltage fluctuation specifically comprises: simplifying a mathematical model of the AC-DC hybrid power transmission system; according to the simplified model, and according to the fact that the voltage at the end of the line is much greater than the voltage drop, the relationship between the voltage drop of the AC bus and the line transmission reactive power and the ratio of the head voltage when the AC line is broken is obtained; setting the influence weight of the DC channel and the AC channel fault on the AC voltage fluctuation according to the identification result; wherein: for the voltage adjustment control of the steady-state voltage drop at the end of the AC line, the influence weight is set from large to small according to the equivalent resistance R of the AC bus, that is, the greater the equivalent resistance, the greater the influence weight; for the voltage adjustment control of the steady-state voltage rise at the head of the AC line, the influence weight is set from large to small according to the ratio of the line transmission reactive power to the head voltage, that is, the greater the ratio of the line transmission reactive power to the head voltage, the greater the influence weight; setting the amplitude of the voltage regulation according to the influence weight, so that the AC-DC hybrid power grid system is within the set range when a fault occurs.

2. The method of claim 1, wherein the method further comprises: determining a voltage of the UHV AC-DC hybrid power grid; and determining a voltage of the UHV AC-DC hybrid power grid based on the voltage of the UHV AC-DC hybrid power grid. The obtained circuit parameters of the transmission line include the transmitted active power, the transmitted reactive power, the line resistance and the line equivalent impedance.

3. The method of claim 1, wherein the method further comprises: determining a voltage of the UHV AC-DC hybrid power grid; and determining a voltage of the UHV AC-DC hybrid power grid based on the voltage of the UHV AC-DC hybrid power grid. When the DC is blocked or surplus power is transferred, the relationship between the voltage drop of the AC bus and the line parameters is: the greater the equivalent resistance from the converter bus to the AC bus, the greater the voltage drop amplitude of the AC bus caused by the DC blocking or surplus power transfer.

4. The method of claim 1, wherein the method further comprises: determining a voltage of the UHV AC-DC hybrid power grid; and determining a voltage of the UHV AC-DC hybrid power grid based on the voltage of the UHV AC-DC hybrid power grid. When the AC line is broken, the relationship between the voltage drop of the AC bus and the line transmission reactive power and the ratio of the head voltage is: the greater the ratio of the line transmission reactive power to the head voltage, the greater the voltage rise at the head of the line caused by the AC line break.

5. The voltage regulation system of the UHV AC-DC hybrid power grid external transmission system, characterized in that, It comprises: an identification module configured to obtain circuit parameters of the transmission line, and identify influences of DC channel and AC channel faults on AC voltage fluctuation; wherein: the influence of the DC channel on the AC voltage fluctuation specifically comprises: simplifying a mathematical model of the AC-DC hybrid power transmission system; according to the simplified model, and according to the fact that the voltage at the head of the transmission line is much greater than the voltage drop, the relationship between the voltage drop of the AC bus and the line parameters when the DC is blocked or surplus power is transferred is obtained; the influence of the AC channel on the AC voltage fluctuation specifically comprises: simplifying a mathematical model of the AC-DC hybrid power transmission system; according to the simplified model, and according to the fact that the voltage at the end of the line is much greater than the voltage drop, the relationship between the voltage drop of the AC bus and the line transmission reactive power and the ratio of the head voltage when the AC line is broken is obtained; The influence weight setting module is configured to set influence weights of DC channel and AC channel faults on AC voltage fluctuation according to the recognition result; wherein: for voltage adjustment control of steady-state voltage drop at the end of the AC line, the influence weights are set in the following manner: the influence weights are set from large to small according to the equivalent resistance R of the AC bus, that is, the larger the equivalent resistance, the larger the influence weight; for voltage adjustment control of steady-state voltage rise at the first end of the AC line, the influence weights are set in the following manner: the influence weights are set from large to small according to the ratio of line transmission reactive power to first end voltage, that is, the larger the ratio of line transmission reactive power to first end voltage, the larger the influence weight; The adjustment module is configured to set the amplitude of voltage regulation according to the influence weights, so that the AC-DC hybrid power grid system has voltage within a set range when a fault occurs.

6. An electronic device, characterized by comprising: A computer program product, including a memory and a processor, and computer instructions stored on the memory and running on the processor, when the computer instructions are run by the processor, complete the steps of the method of any one of claims 1-4.

7. A computer readable storage medium characterized by, A computer program product for storing computer instructions, when the computer instructions are executed by a processor, complete the steps of the method of any one of claims 1-4.

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