CN117613988A - High-voltage direct-current power coordination control method, device, equipment, medium and product - Google Patents

High-voltage direct-current power coordination control method, device, equipment, medium and product Download PDF

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Publication number
CN117613988A
CN117613988A CN202311558745.5A CN202311558745A CN117613988A CN 117613988 A CN117613988 A CN 117613988A CN 202311558745 A CN202311558745 A CN 202311558745A CN 117613988 A CN117613988 A CN 117613988A
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China
Prior art keywords
transmission system
value
power transmission
condition
target
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Application number
CN202311558745.5A
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Chinese (zh)
Inventor
黄剑湘
谢桂泉
李�浩
陈名
赵伟杰
李少森
彭福琨
张启浩
孙豪
王加磊
赵世伟
何照能
魏金林
王小岭
马向南
陈图腾
柳坤
徐峰
梁钰华
杨学广
焦石
冯文昕
刘航
石万里
袁虎强
敬官欣
陈慧
甘卿忠
彭光强
丁丙侯
贺红资
乔柱桥
孙靖铷
付天乙
吴新文
杨光
张子聪
陈诺
溥德启
任君
王云龙
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Kunming Bureau of Extra High Voltage Power Transmission Co
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Kunming Bureau of Extra High Voltage Power Transmission Co
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Application filed by Kunming Bureau of Extra High Voltage Power Transmission Co filed Critical Kunming Bureau of Extra High Voltage Power Transmission Co
Priority to CN202311558745.5A priority Critical patent/CN117613988A/en
Publication of CN117613988A publication Critical patent/CN117613988A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)

Abstract

The application relates to a high-voltage direct-current power coordination control method, a device, equipment, a medium and a product. The method comprises the following steps: acquiring a grounding electrode current limiting action signal of a target loop power transmission system and an operation mode of the target loop power transmission system; when the grounding electrode current limiting action signal is effective and the operation mode is a monopole earth return operation mode, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result; and selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result. The method can effectively avoid the risk of direct current power fluctuation.

Description

High-voltage direct-current power coordination control method, device, equipment, medium and product
Technical Field
The application relates to the technical field of high-voltage direct-current transmission control, in particular to a high-voltage direct-current power coordination control method, a device, equipment, a medium and a product.
Background
The high-voltage direct-current transmission technology is an emerging power technology, has the advantages of large transmission capacity, high voltage level, low manufacturing cost, low operation loss and mature and reliable technology, has good technical economy when the high-capacity and long-distance electric energy is transmitted, and is the development direction of the current direct-current transmission engineering.
The frequency limiting control Function (FLC) and the grounding electrode current limiting control function are two important direct current power control functions of a high-voltage direct current transmission direct current control system, and have an indispensable effect on maintaining safe and stable operation of the direct current transmission system. The current frequency limiting control Function (FLC) and the grounding electrode current limiting control function are mutually independent, and the risk of direct current power fluctuation caused by exposing the current control function in the actual operation process exists.
Disclosure of Invention
Based on this, it is necessary to provide a high-voltage direct-current power coordination control method, a device, equipment, a medium and a product capable of effectively avoiding the risk of direct-current power fluctuation.
In a first aspect, the present application provides a method for coordinated control of high voltage dc power. The method comprises the following steps:
acquiring a grounding electrode current limiting action signal of a target loop power transmission system and an operation mode of the target loop power transmission system;
when the grounding electrode current limiting action signal is effective and the running mode is a monopole earth return running mode, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result;
and selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
In one embodiment, the method further comprises:
acquiring an incoming current value of a target loop power transmission system;
when the incoming current value is larger than the first action reference value and the operation mode is a bipolar earth return operation mode, the first condition is met;
when the first condition is met and the grounding electrode current limiting action signal is effective, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result;
and selecting the minimum value of the initial adjustment distribution amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
In one embodiment, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result includes:
when the operation mode is a monopole earth return operation mode or the first condition is met, a third condition is met;
when the third condition is met and the grounding limit current action signal is effective, a fourth condition is met;
and taking the output of the fourth condition as the input of a set pin S of the RS trigger, and comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value when an output pin Q of the RS trigger is effective to obtain a comparison result.
In one embodiment, the method further comprises:
under the condition that the operation mode is a monopolar metal loop operation mode or a bipolar shutdown mode and the initial adjustment allocation amount is larger than a preset threshold value, if the grounding electrode current limiting action signal is converted from invalid to valid, determining the initial adjustment allocation amount at the current moment as a holding value;
the hold value is set as the upper limit of the target modulation amount during the period in which the condition determined as the hold value is continuously satisfied.
In one embodiment, the method further comprises:
acquiring an incoming current value of a target loop power transmission system;
when the incoming current value is smaller than the second action reference value and the operation mode is a bipolar earth return operation mode, the second condition is met;
when the second condition is met and the initial adjustment distribution amount is larger than a preset threshold value, if the grounding electrode current limiting action signal is converted from invalid to valid, determining the initial adjustment distribution amount at the current moment as a holding value;
the hold value is set as the upper limit of the target modulation amount during the period in which the condition determined as the hold value is continuously satisfied.
In one embodiment, the holding value is set as an upper limit of the target modulation amount during a period in which the condition determined as the holding value is continuously satisfied, including:
Acquiring initial modulation allocation amount corresponding to a future time point which is positioned after the current time point in time sequence in a period of continuously meeting the condition of determining to be a holding value in real time;
and selecting the minimum value of the initial modulation allocation amount and the holding value at the future time as a target modulation amount.
In a second aspect, the present application further provides a high-voltage direct current power coordination control device. The device comprises:
the first acquisition module is used for acquiring a grounding electrode current limiting action signal of the target loop power transmission system and an operation mode of the target loop power transmission system;
the first judging module is used for comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value when the grounding electrode current limiting action signal is effective and the running mode is a monopole earth return running mode, so as to obtain a comparison result;
and the first modulation module is used for selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the following steps:
Acquiring a grounding electrode current limiting action signal of a target loop power transmission system and an operation mode of the target loop power transmission system;
when the grounding electrode current limiting action signal is effective and the running mode is a monopole earth return running mode, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result;
and selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
acquiring a grounding electrode current limiting action signal of a target loop power transmission system and an operation mode of the target loop power transmission system;
when the grounding electrode current limiting action signal is effective and the running mode is a monopole earth return running mode, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result;
and selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprising a computer program which, when executed by a processor, performs the steps of:
acquiring a grounding electrode current limiting action signal of a target loop power transmission system and an operation mode of the target loop power transmission system;
when the grounding electrode current limiting action signal is effective and the running mode is a monopole earth return running mode, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result;
and selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
The high-voltage direct-current power coordination control method, the device, the equipment, the medium and the product acquire a grounding electrode current limiting action signal of the target loop power transmission system and an operation mode of the target loop power transmission system; when the grounding electrode current limiting action signal is effective and the running mode is a monopole earth return running mode, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result; and selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result. According to the method, logic processing is performed by acquiring information such as the grounding electrode current limiting action signal of the target loop power transmission system and the running mode of the target loop power transmission system, under the condition that the grounding electrode current limiting action signal is effective and the running mode is the monopole earth return running mode, the minimum value of the initial adjustment allocation amount and the preset threshold value is selected as the target modulation amount, the upper limit value of the target modulation amount can be reasonably limited to the preset threshold value under the condition, and the aim that the forward modulation amount of the FLC can be reasonably output when the grounding electrode current limiting function acts is achieved, so that the risk of direct current power fluctuation is effectively avoided.
Drawings
FIG. 1 is a diagram of an application environment for a HVDC power coordination control method in one embodiment;
FIG. 2 is a flow chart of a method for coordinated control of HVDC power in one embodiment;
FIG. 3 is a flow chart of a method for controlling the coordination of HVDC power in another embodiment;
FIG. 4 is a flow chart of a method for controlling the high voltage DC power coordination in another embodiment;
FIG. 5 is a flow chart of a method for controlling the high voltage DC power coordination in another embodiment;
FIG. 6 is a flowchart of a method for performing a coordinated control of DC/DC power in another embodiment;
fig. 7 is a bipolar topology of a converter station with a double-loop hvth system loop in one embodiment;
FIG. 8 is a block diagram of a HVDC power coordination control device in one embodiment;
fig. 9 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The frequency limiting control Function (FLC) and the grounding electrode current limiting control function are two important direct current power control functions of a high-voltage direct current transmission direct current control system, and have an indispensable effect on maintaining safe and stable operation of the direct current transmission system.
The main function of the frequency limiting control Function (FLC) is that when an alternating current power grid connected with each converter station of the direct current power transmission system is interfered to cause frequency fluctuation, the frequency tends to be stable by adjusting the direct current power transmitted between the direct current power transmission systems. The FLC function is activated when the frequency exceeds the limit value, for example, when the rectifying side frequency is lower than the lower limit value, and restores the frequency to the frequency lower limit value by reducing the dc power supply by the closed loop control. Similarly, when the frequency is higher than the upper limit, the FLC function increases the direct current transmission power so as to restore the frequency to the upper limit value of the frequency; the main function of the grounding electrode current limiting control function is to limit the current flowing through the grounding electrode in a mode of reducing direct current transmission power, and the grounding electrode accessory equipment is protected from high current.
The current frequency limiting control Function (FLC) and the grounding electrode current limiting control function are mutually independent, and in the actual operation process, the risk of direct current power fluctuation caused by exposing the current control function exists. In simulation calculation of an EMTDC model of a certain direct current engineering, it is found that when a frequency control Function (FLC) has forward output under the action condition of a grounding electrode current limiting function, power fluctuation occurs, and the reason that the phenomenon occurs through analysis is that the grounding electrode current limiting function is opposite to a control target of the FLC function under the condition, and mutual influence exists.
In order to realize the purpose that the forward modulation amount of the FLC can be reasonably output when the grounding electrode current limiting function acts in order to realize the coordination control between the frequency limiting control Function (FLC) and the grounding electrode current limiting control function, the risk of direct current power fluctuation is effectively avoided.
The high-voltage direct-current power coordination control method provided by the embodiment of the application can be applied to an application environment shown in fig. 1. The sub-coordination control systems (h, h is more than or equal to 1) are respectively connected with a converter station running a double-circuit direct current transmission system, and the double-circuit direct current transmission system can comprise a circuit 1 direct current transmission system and a circuit 2 direct current transmission system. The high-voltage direct-current power coordination control device can be respectively deployed in the plurality of sub-coordination control systems to execute the high-voltage direct-current power coordination control method provided by the embodiment of the application on the double-circuit direct-current power transmission system of the converter station.
Or, the plurality of sub-coordination control systems can acquire corresponding information such as the total output quantity of the FLC function of the dual-loop direct current transmission system, the FLC modulation allocation quantity of the loop 1 direct current transmission system, the FLC modulation allocation quantity of the loop 2 direct current transmission system, the action signal of the grounding electrode current limiting function, the action reference value of the grounding electrode current limiting function, the current-in value of the loop 1 direct current transmission system, the current-in value of the loop 2 direct current transmission system, the running mode of the loop 1 direct current transmission system, the running mode of the loop 2 direct current transmission system and the like in real time, and send the information to the independently deployed high-voltage direct current power coordination control device, and the independently deployed high-voltage direct current power coordination control device executes the high-voltage direct current power coordination control method provided by the embodiment of the application.
The independently deployed high-voltage direct-current power coordination control device can be a server, and the server can execute the high-voltage direct-current power coordination control method provided by the embodiment of the application on the received information. Or, the independently deployed high-voltage direct-current power coordination control device may also be a terminal device, and the terminal device executes the high-voltage direct-current power coordination control method provided by the embodiment of the application on the obtained information. The terminal device may be, but not limited to, various personal computers, notebook computers, smart phones, tablet computers, internet of things devices and portable wearable devices, and the server may be implemented by a separate server or a server cluster formed by a plurality of servers.
In one embodiment, as shown in fig. 2, a method for controlling the coordination of the high-voltage direct-current power is provided, and the method is applied to the high-voltage direct-current power coordination control device in fig. 1, and is described by taking as an example, the method comprises the following steps:
step 202, obtaining a grounding electrode current limiting action signal of a target loop power transmission system and an operation mode of the target loop power transmission system.
The target loop power transmission system refers to a specific path in the direct current power transmission system of the converter station, and when the converter station operates the double-loop direct current power transmission system, the target loop power transmission system can refer to any one of the loop 1 direct current power transmission system and the loop 2 direct current power transmission system.
According to the method and the device for obtaining the grounding electrode current limiting action signals of the target loop power transmission system and the running mode of the target loop power transmission system, the running mode of the direct current power transmission system can comprise a monopole earth return running mode, a bipolar earth return running mode, a monopole metal return running mode and a bipolar shutdown mode.
And 204, when the grounding electrode current limiting action signal is effective and the operation mode is a monopole earth return operation mode, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result.
For example, in the embodiment of the present application, the FLC modulation allocation amount p_1 of the back 1 direct current transmission system may be obtained first as the initial modulation allocation amount, and when the ground electrode current limiting action signal of the back 1 direct current transmission system is valid, and the operation mode of the back 1 direct current transmission system is a monopole earth return operation mode, the p_1 and the magnitude of the preset threshold are compared, so as to obtain a comparison result, where the preset threshold may be 0.
Further, for example, in the embodiment of the present application, the FLC modulation allocation amount p_2 of the 2 d.c. power transmission system may be obtained first as the initial modulation allocation amount, and when the current limiting action signal of the ground electrode of the 2 d.c. power transmission system is valid, and the operation mode of the 2 d.c. power transmission system is a monopole earth return operation mode, the p_2 and the preset threshold are compared, so as to obtain a comparison result, where the preset threshold may be 0.
And 206, selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
In the embodiment of the present application, when the current limiting operation signal of the ground electrode is effective and the operation mode is a monopole ground loop operation mode, the minimum value of the initial modulation allocation amount and the preset threshold is selected as the target modulation amount, and when the preset threshold is 0, the upper limit value of the target modulation amount is also limited to 0.
In the high-voltage direct-current power coordination control method, a grounding electrode current limiting action signal of a target loop power transmission system and an operation mode of the target loop power transmission system are obtained; when the grounding electrode current limiting action signal is effective and the running mode is a monopole earth return running mode, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result; and selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result. According to the embodiment of the application, the information such as the grounding electrode current limiting action signal of the target loop power transmission system and the running mode of the target loop power transmission system is obtained to carry out logic processing, when the grounding electrode current limiting action signal is effective and the running mode is the monopole ground return line running mode, the minimum value of the initial adjustment distribution amount and the preset threshold value is selected as the target modulation amount, the upper limit value of the target modulation amount can be reasonably limited to the preset threshold value under the condition, and the aim that the forward modulation amount of the FLC can be reasonably output when the grounding electrode current limiting function acts is achieved, so that the risk of direct current power fluctuation is effectively avoided.
In one embodiment, as shown in fig. 3, based on the embodiment shown in fig. 2, the hvth power coordination control method of the embodiment further includes:
Step 302, obtaining an incoming current value of a target loop power transmission system.
For example, the current in value i_1 of the retrieval 1 direct current transmission system is obtained, or the current in value i_2 of the retrieval 2 direct current transmission system is obtained.
Step 304, when the incoming current value is greater than the first action reference value and the operation mode is the bipolar earth return operation mode, the first condition is satisfied.
The first action reference value may refer to an action reference value i_ref of the ground electrode current limiting function, and may be the same or different for different target loop power transmission systems, for example, the first action reference value corresponding to the return 1 dc power transmission system and the first action reference value corresponding to the return 2 dc power transmission system may be the same value.
And 306, when the first condition is met and the grounding electrode current limiting action signal is effective, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result, and selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
Illustratively, in combination with steps 204 and 206 in the embodiment shown in fig. 2, the embodiment of the present application may determine that the third condition is met when the operation mode is the monopole earth return operation mode or the first condition is met, and determine that the fourth condition is met when the current limiting action signal of the earth electrode is valid and the third condition is met. And under the condition that the fourth condition is met, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result, and selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
In one embodiment, as shown in fig. 4, based on the embodiment shown in fig. 2, the hvth power coordination control method of the embodiment further includes:
in step 402, if the operation mode is a monopolar metal loop operation mode or a bipolar shutdown mode and the initial adjustment allocation amount is greater than the preset threshold, if the grounding electrode current-limiting operation signal is converted from invalid to valid, the initial adjustment allocation amount at the current time is determined as a holding value.
Step 404, setting the hold value as the upper limit of the target modulation amount during the period in which the condition determined as the hold value is continuously satisfied.
In one embodiment, as shown in fig. 5, based on the embodiment shown in fig. 2, the hvth power coordination control method of the embodiment further includes:
step 502, obtaining an incoming current value of a target loop power transmission system.
Step 504, when the incoming current value is smaller than the second action reference value and the operation mode is the bipolar earth return operation mode, the second condition is satisfied.
The second action reference value may be the action reference value i_ref of the grounding electrode current limiting function minus Δi, where Δi may be 5% of the rated current command of the dc power transmission system.
In step 506, when the second condition is satisfied and the initial adjustment allocation amount is greater than the preset threshold, if the grounding electrode current-limiting action signal is converted from invalid to valid, the initial adjustment allocation amount at the current time is determined as a hold value.
In step 508, the hold value is set as the upper limit of the target modulation amount during the period in which the condition determined as the hold value is continuously satisfied.
In one embodiment, based on the embodiments shown in fig. 4 and 5, when the operation mode is a monopolar metal return operation mode or a bipolar shutdown mode, or the second condition is satisfied, it is determined that the fifth condition is satisfied. And when the fifth condition is met, the initial adjustment allocation amount is larger than a preset threshold value and the grounding electrode current limiting action signal is effective, judging that the ninth condition is met.
When the ninth condition is changed from not satisfied to satisfied, the initial adjustment allocation amount at the current time is determined as the hold value. As in the embodiments shown in fig. 4 and 5, in the case where the fifth condition is satisfied and the initial adjustment allocation amount is greater than the preset threshold, if the ground limit operation signal is switched from invalid to valid, that is, when the ninth condition is not satisfied to be satisfied, the initial adjustment allocation amount at the present time is determined as the hold value.
In the embodiment of the application, in a period in which the condition of the hold value is continuously met, acquiring initial modulation allocation amount corresponding to a future time point which is positioned behind the current time point in time sequence in real time; and selecting the minimum value of the initial modulation allocation amount and the holding value at the future time as a target modulation amount.
For example, when the ninth condition is not satisfied and is changed to be satisfied, the initial adjustment allocation amount at the present time is determined as the hold value, and from the present time, if the ninth condition is continuously satisfied, the minimum value of the initial adjustment allocation amount and the hold value at the future time is set as the target modulation amount, that is, the initial adjustment allocation amount at the present time is kept unchanged as the upper limit of the target modulation amount during the period in which the ninth condition is continuously satisfied.
In one embodiment, based on the above embodiment, the present embodiment may implement part of the logic processing in the above embodiment by using an RS flip-flop.
For example, in the embodiment of the present application, the output of the fourth condition is used as the input of the set pin S of the RS flip-flop, the output of the fifth condition is used as the input of the reset pin R of the RS flip-flop, when the output pin Q of the RS flip-flop is valid, it is determined that the sixth condition is satisfied, and in the case that the sixth condition is satisfied, the minimum value of the initial adjustment allocation amount and the preset threshold is selected as the target modulation amount of the target loop power transmission system; when the output pin Q of the RS trigger is invalid, the eighth condition is judged to be met, the seventh condition is judged to be met when the initial adjustment allocation amount is larger than a preset threshold value, the seventh condition and the eighth condition are met, and the ninth condition is judged to be met when the grounding electrode current limiting action signal is valid, and the ninth condition is not met and the initial adjustment allocation amount at the moment of being converted to be met is kept unchanged as the upper limit of the target adjustment amount.
In the RS trigger, the reset pin R takes precedence, i.e. when R is 1, Q is 0; when R is 0 and S is 1, Q is 1; when R and S are both 0, the original Q is kept unchanged. Since the fourth condition and the fifth condition of the present embodiment are mutually exclusive, Q is valid when the fourth condition is satisfied, the sixth condition is satisfied, and the eighth condition is not satisfied; q is invalid when the fifth condition is met, the sixth condition is not met, and the eighth condition is met; when neither the fourth condition nor the fifth condition is satisfied, Q at the previous time is kept unchanged, and it is determined whether the sixth condition and the eighth condition are satisfied based on the Q value at the previous time.
In one embodiment, as shown in fig. 6, the high-voltage direct-current power coordination control method of the present embodiment includes:
and step A1, collecting the total output quantity P_tot of FLC functions of a double-circuit direct current transmission system of a certain converter station, the FLC modulation allocation quantity P_1 of a circuit I direct current transmission system and the FLC modulation allocation quantity P_2 of a circuit II direct current transmission system.
And step A2, collecting action signals of a grounding electrode current limiting function of the back I direct current transmission system and the back II direct current transmission system.
And step A3, collecting an action reference value I_ref of the grounding electrode current limiting function as a first action reference value.
And step A4, collecting an incoming current value I_1 of the return I direct current transmission system and an incoming current value I_2 of the return II direct current transmission system.
And step A5, collecting the operation modes of the back I direct current transmission system and the back II direct current transmission system.
The following description will be made in detail with any one of the back 1 direct current transmission system and the back II direct current transmission system as a target loop transmission system.
And step A6, when the operation mode of the double-pole earth return line is effective and the current value is larger than I_ref, judging that the first condition is met.
For example, as shown in fig. 6, in the case of the return I bipolar earth return operation (unbalance is excessive), the first condition is satisfied.
And A7, when the operation mode of the double-pole earth return line is effective and the current value is smaller than I_ref-delta I, judging that the second condition is met.
For example, as shown in fig. 6, the return I bipolar earth return line operation (approaching equilibrium) is determined that the second condition is satisfied.
And step A8, when the monopole earth return operation mode is effective or the first condition is met, judging that the third condition is met.
For example, as shown in fig. 6, the return I monopolar earth return operation and the return I bipolar earth return operation (unbalance is excessive) are taken as or gate inputs, and the output is the third condition.
And step A9, when the grounding electrode current limiting function action signal is effective and the third condition is met, judging that the fourth condition is met.
For example, as shown in fig. 6, the return I ground limit function operation signal and the third condition are input to the and gate, and the output is the fourth condition.
And step A10, when the monopole metal loop running mode is effective or the second condition is met or the bipolar shutdown mode is effective, judging that the fifth condition is met.
For example, as shown in fig. 6, the fifth condition is to set the or gate input to return I monopole metal loop operation, return I bipolar earth loop operation (near balance), and return I bipolar operation.
Step A11, taking the output of the fourth condition as the input of a set pin S of the RS trigger; the output of the fifth condition is taken as the input of the reset pin "R" of the RS flip-flop.
In step a12, when the output pin "Q" of the RS flip-flop is valid, it is determined that the sixth condition is satisfied.
Step A13, when the sixth condition is met, multiplying the preset value 0 and the FLC initial modulation allocation quantity to be used as the input quantity I of the logic of taking the minimum value; when the sixth condition is not satisfied, the FLC initial modulation allocation amount is multiplied by a preset value 1 to be used as an input amount one of the logic of taking the minimum value.
And step A14, when the FLC initial modulation allocation amount is larger than 0, judging that the seventh condition is met.
And step A15, inverting the sixth condition, and judging that the eighth condition is not met when the output pin 'Q' of the RS trigger is valid, and judging that the eighth condition is met when the output pin 'Q' of the RS trigger is invalid.
And step A16, when the grounding electrode current limiting function action signal is effective and both the seventh condition and the eighth condition are met, the initial modulation allocation quantity of the FLC of the direct current transmission system at the moment is kept unchanged and is used as the input quantity II of the logic of taking the minimum value.
For example, as shown in fig. 6, after the return I-grounded current limiting function operation signal, the eighth condition, and the seventh condition are input to the and gate, the ninth condition is output, and the ninth condition and the return I FLC modulation allocation amount are input to the holding module, and the second input amount is output.
Step A17, the FLC initial modulation allocation amount is used as an input amount three of the logic of taking the minimum value.
For example, as shown in fig. 6, the back I FLC modulation allocation amount is taken as the input amount three.
And step A18, taking the minimum value of the first input quantity, the second input quantity and the third input quantity as a target modulation quantity.
For example, as shown in fig. 6, the input quantity one, input quantity two, and input quantity three are input to the minimum value module, and the I FLC modulation quantity p_mod is output.
According to the embodiment, the aim that the forward modulation quantity of the FLC can be reasonably output when the grounding electrode current limiting function acts can be achieved through the logic processing, and the risk of direct current power fluctuation is effectively avoided.
The following two scenarios are taken as examples to further describe the high-voltage direct-current power coordination control method according to the bipolar topological diagram of the converter station of the double-circuit high-voltage direct-current power transmission system shown in fig. 7.
Firstly, a single-pole earth return line operation mode of the back-1 direct-current transmission system is adopted, and a sixth condition is met if a grounding electrode current limiting function action signal of the back-1 direct-current transmission system is effective; in this case, the minimum value of the FLC modulation allocation amounts p_1 and 0 of the back-1 dc power transmission system FLC modulation amount p_mod will be selected, that is, the upper limit value of the FLC modulation amount p_mod of the back-1 dc power transmission system FLC will be limited to 0 at this time.
In a second scenario, in the single-pole metal loop operation mode of the back 1 direct-current transmission system, when the current limiting function action signal of the grounding electrode of the back 1 direct-current transmission system changes from invalid to valid at the moment that the modulation allocation amount P_1 of the back 1 direct-current transmission system is +200MW, the value that the modulation allocation amount P_1 of the back 1 direct-current transmission system is +200MW is kept unchanged as the upper limit value of the modulation amount P_mod of the back 1 direct-current transmission system FLC.
It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a high-voltage direct-current power coordination control device for realizing the high-voltage direct-current power coordination control method. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of the high-voltage direct-current power coordination control device or devices provided below may refer to the limitation of the high-voltage direct-current power coordination control method hereinabove, and will not be repeated herein.
In one embodiment, as shown in fig. 8, there is provided a high voltage direct current power coordination control device, including: an acquisition module 802, a comparison module 804, and a modulation module 806, wherein:
a first obtaining module 802, configured to obtain a ground limit current action signal of the target loop power transmission system and an operation mode of the target loop power transmission system.
The first determining module 804 is configured to compare the initial modulation allocation amount of the target loop power transmission system with a preset threshold when the current limiting action signal of the grounding electrode is effective and the operation mode is a monopole ground loop operation mode, so as to obtain a comparison result.
The first modulation module 806 is configured to select, according to the comparison result, a minimum value of the initial modulation allocation amount and a preset threshold as a target modulation amount of the target loop power transmission system.
In one embodiment, the hvdc power coordination control device further comprises:
and the second acquisition module is used for acquiring the incoming current value of the target loop power transmission system.
The second judging module is used for meeting the first condition when the current value is larger than the first action reference value and the operation mode is a bipolar earth return operation mode; and when the first condition is met and the grounding limit current action signal is effective, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result.
And the second modulation module is used for selecting the minimum value of the initial adjustment allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
In one embodiment, the second comparing module, when performing the comparison of the initial modulation allocation amount of the target loop power transmission system and the preset threshold, is further configured to: when the operation mode is a monopole earth return operation mode or the first condition is met, a third condition is met; when the third condition is met and the grounding limit current action signal is effective, a fourth condition is met; and taking the output of the fourth condition as the input of a set pin S of the RS trigger, and comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value when an output pin Q of the RS trigger is effective to obtain a comparison result.
In one embodiment, the hvdc power coordination control device further comprises:
and the third judging module is used for determining the initial adjustment distribution amount at the current moment as a holding value if the grounding electrode current limiting action signal is converted from invalid to valid under the condition that the operation mode is a monopolar metal loop operation mode or a bipolar shutdown mode and the initial adjustment distribution amount is larger than a preset threshold value.
And a third modulation module for taking the hold value as an upper limit of the target modulation amount during a period in which the condition determined as the hold value is continuously satisfied.
In one embodiment, the hvdc power coordination control device further comprises:
and the second acquisition module is used for acquiring the incoming current value of the target loop power transmission system.
The fourth judging module is used for meeting a second condition when the current value is smaller than the second action reference value and the operation mode is a bipolar earth return operation mode; when the second condition is satisfied and the initial adjustment allocation amount is larger than the preset threshold value, if the grounding electrode current limiting action signal is converted from invalid to valid, the initial adjustment allocation amount at the current moment is determined to be a holding value.
And a fourth modulation module for taking the hold value as an upper limit of the target modulation amount during a period in which the condition determined as the hold value is continuously satisfied.
In one embodiment, the third modulation module or the fourth modulation module, when the hold value is taken as the upper limit of the target modulation amount during the period in which the condition determined to hold the value is continuously satisfied, is further configured to: acquiring initial modulation allocation amount corresponding to a future time point which is positioned after the current time point in time sequence in a period of continuously meeting the condition of determining to be a holding value in real time; and selecting the minimum value of the initial modulation allocation amount and the holding value at the future time as a target modulation amount.
The modules in the hvdc power coordination control device may be all or partially implemented by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, and the internal structure of which may be as shown in fig. 9. The computer device includes a processor, a memory, an Input/Output interface (I/O) and a communication interface. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface is connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, implements a method for coordinated control of high voltage direct current power.
It will be appreciated by those skilled in the art that the structure shown in fig. 9 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the computer device to which the present application applies, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, implements the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
It should be noted that, the user information (including, but not limited to, user equipment information, user personal information, etc.) and the data (including, but not limited to, data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data are required to comply with the related laws and regulations and standards of the related countries and regions.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.

Claims (10)

1. A method for coordinated control of high voltage direct current power, the method comprising:
acquiring a grounding electrode current limiting action signal of a target loop power transmission system and an operation mode of the target loop power transmission system;
when the grounding electrode current limiting action signal is effective and the operation mode is a monopole earth return operation mode, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result;
And selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
2. The method according to claim 1, wherein the method further comprises:
acquiring an incoming current value of the target loop power transmission system;
when the current value is larger than a first action reference value and the operation mode is a bipolar earth return operation mode, a first condition is met;
when the first condition is met and the grounding electrode current limiting action signal is effective, comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result;
and selecting the minimum value of the initial adjustment allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
3. The method of claim 2, wherein comparing the initial modulation allocation of the target loop power transmission system to a preset threshold results in a comparison result, comprising:
when the operation mode is a monopole earth return operation mode or the first condition is met, a third condition is met;
When the third condition is met and the grounding electrode current limiting action signal is effective, a fourth condition is met;
and taking the output of the fourth condition as the input of a set pin S of the RS trigger, and comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value when an output pin Q of the RS trigger is effective to obtain a comparison result.
4. The method according to claim 1, wherein the method further comprises:
if the operation mode is a monopolar metal loop operation mode or a bipolar shutdown mode and the initial adjustment allocation amount is larger than a preset threshold value, if the grounding electrode current limiting action signal is converted from invalid to valid, determining the initial adjustment allocation amount at the current moment as a holding value;
the hold value is set as an upper limit of the target modulation amount during a period in which the condition determined as the hold value is continuously satisfied.
5. The method according to claim 1, wherein the method further comprises:
acquiring an incoming current value of the target loop power transmission system;
when the current value is smaller than a second action reference value and the operation mode is a bipolar earth return operation mode, a second condition is met;
When a second condition is met and the initial adjustment allocation amount is larger than a preset threshold value, if the grounding electrode current limiting action signal is converted from invalid to valid, determining the initial adjustment allocation amount at the current moment as a holding value;
the hold value is set as an upper limit of the target modulation amount during a period in which the condition determined as the hold value is continuously satisfied.
6. The method according to claim 4 or 5, wherein the holding value is set as an upper limit of the target modulation amount during a period in which the condition determined as the holding value is continuously satisfied, comprising:
acquiring initial modulation allocation amount corresponding to a future time point which is positioned after the current time point in time sequence in a period of continuously meeting the condition of determining to be a holding value in real time;
and selecting the minimum value of the initial modulation allocation amount and the maintenance value at the future moment as the target modulation amount.
7. A high voltage direct current power coordination control device, the device comprising:
the first acquisition module is used for acquiring a grounding electrode current limiting action signal of the target loop power transmission system and an operation mode of the target loop power transmission system;
the first judging module is used for comparing the initial modulation allocation amount of the target loop power transmission system with a preset threshold value to obtain a comparison result when the grounding electrode current limiting action signal is effective and the running mode is a monopole earth return running mode;
And the first modulation module is used for selecting the minimum value of the initial modulation allocation amount and the preset threshold value as the target modulation amount of the target loop power transmission system according to the comparison result.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
CN202311558745.5A 2023-11-21 2023-11-21 High-voltage direct-current power coordination control method, device, equipment, medium and product Pending CN117613988A (en)

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