Converter station automatic voltage control method, device and equipment and storage medium

Abstract

The invention discloses an automatic voltage control method, device and equipment for a converter station and a storage medium, and the method comprises the steps: enabling a bus to operate in a combined operation mode, judging that the deviation of the real-time voltage values of an on-duty bus and a non-on-duty bus is within a reasonable range, and when the voltage of the on-duty bus exceeds the limit, starting the on-duty bus; distributing the reactive power regulation quantity required by the on-duty bus among the direct current control and protection devices connected with the on-duty bus, and regulating the reactive power output of each direct current control and protection device; wherein the buses run in a split running mode, whether the voltage of each bus is out of limit or not is judged, and for the buses with the voltage out of limit, the reactive power output of the direct current control and protection device connected with the out-of-limit buses is adjusted according to the reactive power adjusting quantity required by the out-of-limit buses. The problem that the converter station lacks an automatic voltage control function can be solved, and the power station bus voltage and equipment operation safety are guaranteed.

Description

Technical Field

[0001] The present invention belongs to the field of power system control and protection, and in particular relates to a converter station automatic voltage control method, device, equipment and storage medium. Background Art

[0002] With the accelerated construction of new power systems, flexible direct current (HVDC) transmission technology, with its flexible reactive power regulation capabilities, rapid response characteristics, and strong adaptability to weak grids, has been widely adopted in large-scale renewable energy grid integration and cross-regional interconnection. However, reactive power control in most flexible direct current (HVDC) converter stations still relies on manual operation. This is due to low operational efficiency and reliance on operator experience. Frequent manual operation can lead to misjudgment, missed adjustments, and other issues, increasing control risks. Furthermore, the lack of coordinated control between flexible direct current (HVDC) converter stations and nearby substations and renewable energy stations leads to irrational reactive power flows, increasing system losses and significantly impacting economic operation. There is an urgent need to upgrade the technology by adding automatic voltage control (AVC) functionality to converter stations. This will address the current challenges of automatic voltage control in converter stations, achieve efficient reactive resource utilization, and coordinate across multiple spatial and temporal scales, supporting the safe and stable operation of power grids with a high proportion of renewable energy in new power systems. However, limited research has been conducted on automatic voltage control methods for converter stations. Summary of the Invention

[0003] The purpose of the present invention is to provide a method, device, equipment and storage medium for automatic voltage control of a converter station, which can solve the problem of lack of automatic voltage control function in the converter station and ensure the safety of the bus voltage and equipment operation of the power station.

[0004] In order to achieve the above object, the solution of the present invention is:

[0005] A converter station automatic voltage control method, comprising:

[0006] Different control schemes are adopted according to whether the busbar is in separate operation mode or combined operation mode;

[0007] Among them, when the busbar is operating in the combined operation mode, it is judged whether the deviation of the real-time voltage value of the duty busbar and the non-duty busbar is within a reasonable range. If not, no voltage control is performed; if it is within a reasonable range, it is further judged whether the voltage of the duty busbar exceeds the limit. If the voltage of the duty busbar does not exceed the limit, the voltage control is terminated. Otherwise, the reactive power regulation required by the duty busbar is distributed among the DC control and protection devices connected to the duty busbar, and the reactive output of each DC control and protection device is adjusted;

[0008] The busbars are operated in a separate operation mode to determine whether the voltage of each busbar exceeds the limit. For the busbars whose voltage exceeds the limit, the reactive output of the DC control and protection device connected to the busbar is adjusted according to the reactive power regulation required by the busbar.

[0009] Among them, when the busbar is running in the combined operation mode, judging whether the voltage of the duty busbar exceeds the limit includes:

[0010] The bus voltage target value, bus voltage dead zone value, and bus voltage real-time value of the on-duty bus are obtained in real time. If |voltage target value - voltage real-time value|>voltage dead zone value is established, it is determined that the on-duty bus voltage exceeds the limit.

[0011] The reactive power regulation amount required by the duty bus is distributed among the DC control and protection devices connected to the duty bus, and the reactive power output of each DC control and protection device is adjusted, including:

[0012] Determine the reactive power regulation required for the duty bus according to the duty bus voltage, wherein the reactive power regulation includes increasing the duty bus reactive power or decreasing the duty bus reactive power;

[0013] Determining the adjustable reactive power of each DC control and protection device according to the current reactive power of each DC control and protection device that has a topological connection relationship with the duty bus;

[0014] According to the adjustable reactive power, the reactive output of each DC control and protection device is adjusted.

[0015] Among them, according to the duty bus voltage, the reactive power regulation required by the duty bus is determined, including:

[0016] Compare the duty bus voltage target value with the bus voltage real-time value. If the duty bus voltage target value is higher than the bus voltage real-time value, the reactive power is increased, otherwise the reactive power is decreased.

[0017] Among them, the reactive power regulation required by the duty bus is:

[0018] ΔQ=(U tar -U real )*k*(|U tar -U real |>U deadzone )

[0019] Among them, U tar is the bus voltage target value of the duty bus, U real is the real-time value of the bus voltage of the duty bus, U deadzone is the bus voltage dead zone value of the duty bus, and k is the conversion coefficient between the bus reactive power regulation and bus voltage regulation of the duty bus.

[0020] Wherein, according to the current reactive power of each DC control and protection device having a topological connection relationship with the duty bus, determining the reactive power adjustable amount of each DC control and protection device includes:

[0021] If the duty bus increases its reactive power, the total reactive power of the DC control device connected to the duty bus can be increased by Among them, Q up is the reactive power increase value of the mth DC control device connected to the duty bus, M is the total number of DC control devices connected to the duty bus; the reactive power output adjustment target value of the mth DC control device is,

[0022]

[0023] If the duty busbar reduces its reactive power, the total reactive power of the DC control device connected to the duty busbar can be reduced to Among them, Q dn is the reactive power reduction amount of the mth DC control device connected to the duty bus; the reactive power output adjustment target value of the mth DC control device is,

[0024]

[0025] in, is the reactive output adjustment target value of the mth DC control and protection device connected to the over-limit busbar, is the real-time reactive power value of the mth DC control device connected to the over-limit busbar. If Greater than but Set to for The upper limit, if Less than but Set to for The lower limit of .

[0026] Wherein, the busbar is operated in a separate operation mode, and it is judged whether the voltage of each busbar exceeds the limit. For the busbar whose voltage exceeds the limit, the reactive output of the DC control and protection device connected to the busbar is adjusted according to the reactive adjustment amount required by the busbar, including:

[0027] Obtain the bus voltage target value, bus voltage dead zone value, and bus voltage real-time value of each bus in real time. If |voltage target value - voltage real-time value|>voltage dead zone value is established, the bus voltage is judged to be out of limit;

[0028] Determine the reactive power regulation required for the over-limit bus according to the over-limit bus voltage, wherein the reactive power regulation includes increasing the reactive power of the over-limit bus or decreasing the reactive power of the over-limit bus;

[0029] Determine the adjustable reactive power of the DC control and protection device according to the current reactive power of the DC control and protection device connected to the over-limit bus;

[0030] The reactive output of the DC control and protection device is adjusted according to the adjustable reactive power.

[0031] Among them, according to the over-limit bus voltage, the reactive power regulation required for the over-limit bus is determined, including:

[0032] Compare the bus voltage target value of each bus with the bus voltage real-time value of the bus. If the bus voltage target value of a bus is higher than the bus voltage real-time value, the reactive power is increased, otherwise the reactive power is reduced.

[0033] Among them, the reactive power regulation of the i-th over-limit bus is:

[0034]

[0035] in, is the bus voltage target value of the i-th over-limit bus, is the real-time value of the bus voltage of the i-th over-limit bus, is the bus voltage dead zone value of the i-th over-limit bus, k i is the conversion coefficient between the bus reactive power regulation and bus voltage regulation of the i-th over-limit bus.

[0036] Wherein, according to the current reactive power of the DC control protection device connected to the over-limit bus, the reactive power adjustable amount of the DC control protection device is determined, including:

[0037] The reactive output regulation target value of the DC control device connected to the i-th over-limit bus is:

[0038]

[0039] in, is the reactive output regulation target value of the DC control device connected to the i-th over-limit busbar, is the real-time reactive power value of the DC control device connected to the i-th over-limit busbar, if Greater than but Set to for The upper limit, if Less than but Set to for The lower limit of .

[0040] A converter station automatic voltage control device, comprising:

[0041] The bus data acquisition unit is configured to monitor the bus tie switch position, bus voltage dead zone value, and bus voltage real-time value in real time;

[0042] The busbar over-limit determination unit is configured to determine whether the busbar is in a separate operation mode or a combined operation mode, and when the busbar is in the combined operation mode, further determine whether the deviation between the real-time voltage values ​​of the duty busbar and the non-duty busbar is within a reasonable range; if it is within a reasonable range, further determine whether the voltage of the duty busbar is over-limit; when the busbar is in the combined operation mode, determine whether there is a busbar over-limit;

[0043] The reactive power distribution unit is configured to distribute the reactive power regulation required by the duty bus among the DC control and protection devices connected to the duty bus when the bus is in a combined operation mode, and to determine the reactive power output of the DC control and protection devices connected to the over-limit bus according to the reactive power regulation required by the over-limit bus when the bus is in a separate operation mode; and

[0044] The reactive power instruction issuing unit is configured to issue reactive power control instructions to the DC control and protection device.

[0045] A computer device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor; when the processor executes the computer program, the steps of the converter station automatic voltage control method as described above are implemented.

[0046] A computer-readable storage medium stores a computer program; when the computer program is executed by a processor, the steps of the converter station automatic voltage control method as described above are implemented.

[0047] After adopting the above scheme, the beneficial effects achieved by the present invention are as follows: the present invention determines whether the bus is in a separate or combined operation mode based on the acquired bus operation mode, bus voltage target value, bus voltage dead zone value and bus voltage real-time value; in the case of bus voltage exceeding the limit, calculates the reactive power adjustment capability of the DC control and protection device that has a topological connection relationship with the exceeding-limit bus; issues reactive power adjustment instructions to each DC control and protection device according to the set allocation strategy, changes the reactive power output of the DC control and protection device, realizes automatic voltage control of the converter station bus, makes full use of the converter station's own reactive power adjustment capability, and ensures the converter station bus voltage safety and equipment operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a topological diagram of a converter station to which the present invention is applied;

[0049] Figure 2 The present invention provides a flow chart of an automatic voltage control method for a converter station. DETAILED DESCRIPTION

[0050] The technical solutions and beneficial effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] The embodiment of the present invention provides a converter station automatic voltage control method, which is applicable to Figure 1 As shown in the converter station structure, N converter stations are respectively connected to N DC control and protection devices and N busbars, and each busbar is connected to a corresponding DC transmission line. The method for realizing automated voltage control of the converter station includes the following steps:

[0052] Step 1: Real-time monitoring of the bus tie switch position, bus voltage target value, bus voltage dead zone value, and bus voltage real-time value;

[0053] Step 2: Determine whether the busbar is in a split operation mode or a combined operation mode based on the position of the bus tie breaker. If the bus tie breaker is in the open position, the busbar is in the split operation mode; if the bus tie breaker is in the closed position, the busbar is in the combined operation mode. If the busbar is in the combined operation mode, proceed to step 3; otherwise, proceed to step 5.

[0054] Step 3: If the busbar is in the combined operation mode, continue to determine whether the real-time voltage deviation between the duty busbar and the non-duty busbar is within a reasonable range. If not, an alarm is issued to the converter station operation and maintenance personnel, and no adjustment is performed. Otherwise, go to step 4.

[0055] In some embodiments, the deviation between the real-time voltage values ​​of the duty bus and the non-duty bus is set to 0.2% to 1% of the rated voltage.

[0056] Step 4: When the deviation between the real-time voltage values ​​of the duty bus and the non-duty bus is within a reasonable range, the duty bus voltage is judged to be over-limit based on the calculation results of the bus voltage target value, bus voltage dead zone value, and bus voltage real-time value of the duty bus. When |voltage target value - voltage real-time value|>voltage dead zone value, the voltage is over-limit. At this time, the reactive power regulation capability of the DC control and protection device that has a topological connection relationship with the duty bus is calculated, reactive power is allocated according to the set allocation strategy, and the reactive power output of the DC control and protection device connected to the over-limit bus is adjusted;

[0057] If according to the calculation results, no on-duty bus voltage exceeds the limit, the voltage control plan will be terminated.

[0058] The method of adjusting the reactive output of the DC control and protection device connected to the over-limit bus according to the current reactive power and voltage of the DC control and protection device connected to the over-limit bus includes the following steps:

[0059] Step 41: Determine whether to increase or decrease the reactive power of the over-limit bus based on the over-limit bus voltage; if the over-limit bus voltage target value is higher than the bus voltage real-time value, the reactive power is increased; otherwise, the reactive power is decreased;

[0060] Step 42, determining the adjustable reactive power of all DC control and protection devices connected to the over-limit bus based on the current reactive power of each DC control and protection device connected to the over-limit bus;

[0061] Step 43: Adjust the reactive output of the DC control and protection device connected to the over-limit bus according to the adjustable reactive power.

[0062] In step 42, the reactive power adjustable amount includes an adjustable reactive power increase amount and a adjustable reactive power decrease amount; and calculating the total adjustable reactive power of the DC control and protection device connected to the over-limit bus when the over-limit bus increases or decreases reactive power, based on the adjustable reactive power of the DC control and protection device connected to the over-limit bus, includes:

[0063] The reactive power regulation of the over-limit duty bus is:

[0064] ΔQ=(U tar -U real )*k*(|U tar -U real |>U deadzone )

[0065] Among them, U tar is the bus voltage target value of the duty bus that exceeds the limit, U real is the real-time value of the bus voltage of the duty bus that exceeds the limit, U deadzone is the bus voltage dead zone value of the on-duty bus that exceeds the limit, and k is the conversion coefficient between the bus reactive power regulation and bus voltage regulation of the on-duty bus that exceeds the limit;

[0066] In some embodiments, U deadzone Set to 0.2kV-10kV; k is the actual test value on site, which is 10-100MVar / kV.

[0067] If the reactive power of the over-limit bus increases, the reactive power of the DC control device connected to the over-limit duty bus can be increased by Among them, Q up is the reactive power adjustable amount of the mth DC control and protection device connected to the over-limit bus, and M is the total number of DC control and protection devices connected to the over-limit bus;

[0068] If the reactive power of the over-limit busbar is reduced, the reactive power of the DC control device connected to the over-limit duty busbar can be reduced by Among them, Q dn It is the amount of reactive power that can be reduced by the mth DC control and protection device connected to the over-limit bus.

[0069] Wherein, in step 43, adjusting the reactive output of the DC control and protection device connected to the over-limit bus according to the reactive adjustable amount includes:

[0070] If the over-limit bus increases reactive power, the reactive output adjustment target value of the connected mth DC control device is:

[0071]

[0072] If the over-limit busbar reduces reactive power, the reactive output adjustment target value of the connected mth DC control device is:

[0073]

[0074] in, is the reactive output adjustment target value of the mth DC control and protection device connected to the over-limit busbar, is the real-time reactive power value of the mth DC control device connected to the over-limit busbar. If Greater than but Set to for The upper limit, if Less than but Set to for The lower limit of .

[0075] Step 5: If the bus is in the split operation mode, determine whether the voltage of each bus exceeds the limit based on the target value, dead-band value, and real-time value of each bus voltage. For buses whose voltage exceeds the limit, adjust the reactive power output of the DC control and protection device connected to the bus based on the current reactive power and voltage of the DC control and protection device connected to the bus.

[0076] Wherein, in said step 5, adjusting the reactive output of the DC control and protection device connected to the over-limit bus according to the current reactive power and voltage of the DC control and protection device connected to the over-limit bus includes the following steps:

[0077] Step 51, determining whether to increase or decrease the reactive power of the over-limit bus according to the over-limit bus voltage;

[0078] Step 52, determining the adjustable reactive power of each DC control and protection device connected to the over-limit bus based on the current reactive power of each DC control and protection device connected to the over-limit bus;

[0079] Step 53: According to the adjustable reactive power, adjust the reactive power output of the DC control and protection device connected to the over-limit bus.

[0080] Wherein, in said step 52, the reactive adjustable amount includes the reactive adjustable amount and the reactive adjustable amount; according to the reactive adjustable amount of the DC control protection device connected to the over-limit bus, the total reactive adjustable amount of the DC control protection device connected to the over-limit bus is calculated when the over-limit bus increases or decreases the reactive power;

[0081] The reactive power regulation of the i-th over-limit bus is:

[0082]

[0083] in, is the bus voltage target value of the i-th over-limit bus, is the real-time value of the bus voltage of the i-th over-limit bus, is the bus voltage dead zone value of the i-th over-limit bus, k i is the conversion coefficient between the bus reactive power regulation and bus voltage regulation of the i-th over-limit bus;

[0084] In some embodiments, Set to 0.2kV-10kV; k i It is the actual test value on site, which is 10-100MVar / kV.

[0085] Wherein, in step 53, adjusting the reactive output of the DC control and protection device connected to the over-limit bus according to the reactive adjustable amount includes:

[0086] The reactive output regulation target value of the DC control device connected to the i-th over-limit bus is:

[0087]

[0088] in, is the reactive output regulation target value of the DC control device connected to the i-th over-limit busbar, is the real-time reactive power value of the DC control device connected to the i-th over-limit busbar, if Greater than but Set to for The upper limit, if Less than but Set to for The lower limit of .

[0089] Based on the same technical solution, the present invention also discloses a software device of the above method, a converter station automatic voltage control device, comprising:

[0090] The bus data acquisition unit specifically includes: a unit for real-time monitoring of the bus tie switch position, bus voltage target value, bus voltage dead zone value, and bus voltage real-time value;

[0091] The busbar over-limit judgment unit specifically includes: determining whether the busbar is in a separate operation mode or a combined operation mode; if it is in a combined operation mode, determining whether the deviation between the real-time voltage values ​​of the duty busbar and the non-duty busbar is reasonable; if it is within a reasonable range, continuing to determine whether the busbar voltage of the duty busbar is over-limit; if it is in a separate operation mode, determining whether the voltage of each busbar is over-limit;

[0092] The reactive power distribution unit specifically includes: a DC control and protection device for determining whether it has a topological connection relationship with the over-limit bus, calculating the reactive power adjustable amount of the DC control and protection device, and distributing it according to a set strategy; and

[0093] The reactive power instruction issuing unit specifically includes: a unit for issuing reactive power control instructions to the DC control and protection device.

[0094] Based on the same technical solution, an embodiment of the present invention also provides another computer device, including one or more processors, one or more memories, and one or more computer programs, wherein the one or more computer programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing the methods in the aforementioned embodiments.

[0095] In practical applications, the processor includes a field-programmable gate array (FPGA), and the processor may be a central processing unit (CPU) or a digital signal processor (DSP). It is understood that for different devices, the electronic components used to implement the above-mentioned processor functions may also be other, and the embodiments of the present invention are not specifically limited thereto.

[0096] The above-mentioned memory can be a volatile memory (volatile memory), such as a random-access memory (RAM); or a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory, a hard disk (HDD) or a solid-state drive (SSD); or a combination of the above types of memory, and provides instructions and data to the processor.

[0097] In an exemplary embodiment, an embodiment of the present invention further provides a computer-readable storage medium for storing one or more computer programs, wherein the one or more computer programs include instructions, which, when executed by a computer device, enable the computer device to execute the method in the aforementioned embodiment.

[0098] Optionally, the computer-readable storage medium can be applied to any one of the methods in the embodiments of the present invention, and the computer program enables the computer to execute the corresponding processes implemented by the processor in each method in the embodiments of the present invention. For the sake of brevity, they are not repeated here.

[0099] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0100] It will be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention may be implemented in various computer languages, for example, the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0101] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0102] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0103] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0104] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0105] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A converter station automatic voltage control method, characterized by: include, Different control schemes are adopted according to whether the busbar is in separate operation mode or combined operation mode; Among them, when the busbar is operating in the combined operation mode, it is judged whether the deviation of the real-time voltage value of the duty busbar and the non-duty busbar is within a reasonable range. If not, no voltage control is performed; if it is within a reasonable range, it is further judged whether the voltage of the duty busbar exceeds the limit. If the voltage of the duty busbar does not exceed the limit, the voltage control is terminated. Otherwise, the reactive power regulation required by the duty busbar is distributed among the DC control and protection devices connected to the duty busbar, and the reactive output of each DC control and protection device is adjusted; The busbars are operated in a separate operation mode to determine whether the voltage of each busbar exceeds the limit. For the busbars whose voltage exceeds the limit, the reactive output of the DC control and protection device connected to the busbar is adjusted according to the reactive power regulation required by the busbar.

2. The method according to claim 1, wherein: When the busbar is running in the combined operation mode, determine whether the voltage of the duty busbar exceeds the limit, including: The bus voltage target value, bus voltage dead zone value, and bus voltage real-time value of the on-duty bus are obtained in real time. If |voltage target value - voltage real-time value|>voltage dead zone value is established, it is determined that the on-duty bus voltage exceeds the limit.

3. The method according to claim 1, wherein: The reactive power regulation amount required by the duty bus is distributed among the DC control and protection devices connected to the duty bus, and the reactive power output of each DC control and protection device is adjusted, including: Determine the reactive power regulation required for the duty bus according to the duty bus voltage, wherein the reactive power regulation includes increasing the duty bus reactive power or decreasing the duty bus reactive power; Determining the adjustable reactive power of each DC control and protection device according to the current reactive power of each DC control and protection device that has a topological connection relationship with the duty bus; According to the adjustable reactive power, the reactive output of each DC control and protection device is adjusted.

4. The method according to claim 3, wherein: According to the duty bus voltage, determine the reactive power regulation required for the duty bus, including: Compare the duty bus voltage target value with the bus voltage real-time value. If the duty bus voltage target value is higher than the bus voltage real-time value, the reactive power is increased, otherwise the reactive power is decreased. Among them, the reactive power regulation required by the duty bus is: ΔQ=(U tar -U real )*k*(|U tar -U real |>U deadzone ) Among them, U tar is the bus voltage target value of the duty bus, U real is the real-time value of the bus voltage of the duty bus, U deadzone is the bus voltage dead zone value of the duty bus, and k is the conversion coefficient between the bus reactive power regulation and bus voltage regulation of the duty bus.

5. The method according to claim 4, wherein: According to the current reactive power of each DC control and protection device having a topological connection relationship with the duty bus, the adjustable reactive power of each DC control and protection device is determined, including: If the duty bus increases its reactive power, the total reactive power of the DC control device connected to the duty bus can be increased by Among them, Q up is the reactive power increase value of the mth DC control device connected to the duty bus, M is the total number of DC control devices connected to the duty bus; the reactive power output adjustment target value of the mth DC control device is, If the duty busbar reduces its reactive power, the total reactive power of the DC control device connected to the duty busbar can be reduced to Among them, Q dn is the reactive power reduction amount of the mth DC control device connected to the duty bus; the reactive power output adjustment target value of the mth DC control device is, in, is the reactive output adjustment target value of the mth DC control and protection device connected to the over-limit busbar, is the real-time reactive power value of the mth DC control device connected to the over-limit busbar. If Greater than but Set to for The upper limit, if Less than but Set to for The lower limit of .

6. The method according to claim 1, wherein: The busbars are operated in a separate operation mode, and it is determined whether the voltage of each busbar exceeds the limit. For the busbars whose voltage exceeds the limit, the reactive output of the DC control and protection device connected to the busbar is adjusted according to the reactive adjustment amount required by the busbar, including: Obtain the bus voltage target value, bus voltage dead zone value, and bus voltage real-time value of each bus in real time. If |voltage target value - voltage real-time value|>voltage dead zone value is established, the bus voltage is judged to be out of limit; Determine the reactive power regulation required for the over-limit bus according to the over-limit bus voltage, wherein the reactive power regulation includes increasing the reactive power of the over-limit bus or decreasing the reactive power of the over-limit bus; Determine the adjustable reactive power of the DC control and protection device according to the current reactive power of the DC control and protection device connected to the over-limit bus; The reactive output of the DC control and protection device is adjusted according to the adjustable reactive power.

7. The method according to claim 6, wherein: According to the over-limit bus voltage, determine the reactive power regulation required for the over-limit bus, including: Compare the bus voltage target value of each bus with the bus voltage real-time value of the bus. If the bus voltage target value of a bus is higher than the bus voltage real-time value, the reactive power is increased, otherwise the reactive power is reduced. Among them, the reactive power regulation of the i-th over-limit bus is: in, is the bus voltage target value of the i-th over-limit bus, is the real-time value of the bus voltage of the i-th over-limit bus, is the bus voltage dead zone value of the i-th over-limit bus, k i is the conversion coefficient between the bus reactive power regulation and bus voltage regulation of the i-th over-limit bus.

8. The method according to claim 7, wherein: According to the current reactive power of the DC control protection device connected to the over-limit bus, the reactive power adjustable amount of the DC control protection device is determined, including: The reactive output regulation target value of the DC control device connected to the i-th over-limit bus is: in, is the reactive output regulation target value of the DC control device connected to the i-th over-limit busbar, is the real-time reactive power value of the DC control device connected to the i-th over-limit busbar, if Greater than but Set to for The upper limit, if Less than but Set to for The lower limit of .

9. A converter station automatic voltage control device, characterized by: include, The bus data acquisition unit is configured to monitor the bus tie switch position, bus voltage dead zone value, and bus voltage real-time value in real time; The busbar over-limit determination unit is configured to determine whether the busbar is in a separate operation mode or a combined operation mode, and when the busbar is in the combined operation mode, further determine whether the deviation between the real-time voltage values ​​of the duty busbar and the non-duty busbar is within a reasonable range; if it is within a reasonable range, further determine whether the voltage of the duty busbar is over-limit; when the busbar is in the combined operation mode, determine whether there is a busbar over-limit; The reactive power distribution unit is configured to distribute the reactive power regulation required by the duty bus among the DC control and protection devices connected to the duty bus when the bus is in a combined operation mode, and to determine the reactive power output of the DC control and protection devices connected to the over-limit bus according to the reactive power regulation required by the over-limit bus when the bus is in a separate operation mode; and The reactive power instruction issuing unit is configured to issue reactive power control instructions to the DC control and protection device.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor; characterized in that: When the processor executes the computer program, the steps of the converter station automatic voltage control method according to any one of claims 1 to 8 are implemented.

11. A computer-readable storage medium storing a computer program; wherein: When the computer program is executed by a processor, the steps of the converter station automatic voltage control method according to any one of claims 1 to 8 are implemented.

Images