CN115800356A - Power grid black start control method, device and equipment for flexible direct current transmission - Google Patents
Power grid black start control method, device and equipment for flexible direct current transmission Download PDFInfo
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Abstract
The invention relates to a power grid black start control method, a device and equipment for flexible direct current transmission, wherein the method comprises the steps of obtaining a first charging state of a first grid side converter, determining to control the first grid side converter to be unlocked, adopting a constant direct current voltage control strategy to control the first grid side converter to operate, and obtaining a second charging state of a second grid side converter at the same time; determining to control the second network side converter to be unlocked according to the second charging state, controlling the second network side converter to operate by adopting an open-loop V/F control strategy and acquiring network side information of a black-start power grid; and determining to adopt a closed-loop V/F control strategy or a P/Q control strategy to control the second grid-side converter to operate according to the grid-side information. According to the method, a control strategy is selected according to the charging states of the first and second network side converters, and the second network side converter adopts a closed-loop V/F control strategy or a P/Q control strategy according to the network side information of the second network side converter, so that the risk of black-start high-frequency resonance is reduced, and the operation stability of the black-start process is improved.
Description
Technical Field
The invention relates to the technical field of direct current transmission, in particular to a power grid black start control method, device and equipment for flexible direct current transmission.
Background
In recent years, flexible direct current transmission technology (VSC-HVDC for short) is rapidly developed, and the VSC-HVDC has the advantages that the traditional HVDC cannot achieve, current can be automatically turned off, the VSC-HVDC can work in a passive inversion mode, additional phase-change voltage is not needed, the control capability can be rapidly recovered, and black start of a power grid can be achieved within a short time. Under the working condition of an extreme power grid, a voltage source converter-based high-voltage direct-current transmission (VSC-HVDC) system is used as a black start power supply, and the black start capability of the flexible direct-current project is utilized, so that the recovery of the alternating-current system is realized after the single-side alternating-current system is shut down due to failure, and the reconstruction of the alternating-current system is completed.
However, the existing flexible direct current black start technology mainly aims at a start strategy of an islanding power-supply-free system, and a direct current control strategy on a power grid side at a black start stage in the flexible direct current black start technology does not need to be correspondingly adjusted due to wiring change, so that high-frequency resonance risk at the initial stage of black start is caused, and alternating current fault ride-through at the middle stage of black start cannot be realized.
Disclosure of Invention
The embodiment of the invention provides a power grid black start control method, a device and equipment for flexible direct current power transmission, which are applied to a power grid black start system for flexible direct current power transmission and are used for solving the technical problem that a direct current control strategy on a power grid side at a black start stage in the conventional flexible direct current black start technology does not need to be correspondingly adjusted due to wiring change of the direct current control strategy.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a power grid black-start control method for flexible direct current transmission is applied to a power grid black-start system for flexible direct current transmission, the power grid black-start system for flexible direct current transmission comprises a first power grid, a black-start power grid and a flexible direct current transmission system for connecting the first power grid and the black-start power grid, the flexible direct current transmission system comprises a first grid side converter for connecting with the first power grid and a second grid side converter for connecting with the black-start power grid, and the power grid black-start control method for flexible direct current transmission comprises the following steps:
the method comprises the steps of obtaining a first charging state of a first network side converter, determining and controlling the first network side converter to be unlocked according to the first charging state, controlling the first network side converter to operate by adopting a constant direct-current voltage control strategy, and obtaining a second charging state of a second network side converter at the same time;
determining to control a second network side converter to be unlocked according to the second charging state, controlling the second network side converter to operate by adopting an open-loop V/F control strategy, and acquiring network side information of a black-start power grid;
and determining to adopt a closed-loop V/F control strategy or a P/Q control strategy to control the second grid-side converter to operate according to the grid-side information.
Preferably, the determining to control the second grid-side converter to operate by using a closed-loop V/F control strategy or a P/Q control strategy according to the grid-side information includes:
if the grid side information indicates that at least one alternating current transmission line and at least one load of the black-start power grid are connected with the second grid side converter, controlling the second grid side converter to operate by adopting a closed-loop V/F control strategy;
and if the grid side information is that at least one power generation device of the black-start power grid is connected with the second grid side converter and the short-circuit capacity short-circuit ratio of the second grid side converter exceeds a threshold value, controlling the second grid side converter to operate by adopting a P/Q control strategy.
Preferably, the determining to control the second grid-side converter to be unlocked according to the second charging state and the controlling the second grid-side converter to operate by using the open-loop V/F control strategy includes: and only if the second charging state is that the second network side converter is in a full charging state, and after the second network side converter is controlled to be unlocked, the second network side converter is controlled to operate by adopting an open-loop V/F control strategy.
Preferably, the controlling the operation of the first grid-side converter by using the constant direct-current voltage control strategy comprises: controlling the DC-side voltage of the first grid-side converter to a voltage rating of a flexible DC transmission system while charging the second grid-side converter through the first electrical grid.
Preferably, before the first charging state of the first grid-side converter is acquired, the grid black start control method for flexible direct current transmission includes: charging the first grid side converter through the first grid.
The invention also provides a power grid black start control device for flexible direct current power transmission, which is applied to a power grid black start system for flexible direct current power transmission, wherein the power grid black start system for flexible direct current power transmission comprises a first power grid, a black start power grid and a flexible direct current power transmission system for connecting the first power grid with the black start power grid, the flexible direct current power transmission system comprises a first grid side converter for connecting with the first power grid and a second grid side converter for connecting with the black start power grid, and the power grid black start control device for flexible direct current power transmission comprises a first control module, a second control module and a third control module;
the first control module is used for acquiring a first charging state of the first network side converter, determining and controlling the first network side converter to be unlocked according to the first charging state, controlling the first network side converter to operate by adopting a constant direct-current voltage control strategy and acquiring a second charging state of the second network side converter at the same time;
the second control module is used for determining and controlling the second grid-side converter to be unlocked according to the second charging state, controlling the second grid-side converter to operate by adopting an open-loop V/F control strategy and acquiring grid-side information of a black-start power grid;
and the third control module is used for determining to adopt a closed-loop V/F control strategy or a P/Q control strategy to control the second grid-side converter to operate according to the grid-side information.
Preferably, the third control module is further configured to control the second grid-side converter to operate by using a closed-loop V/F control strategy according to that the grid-side information is at least one ac transmission line and at least one load of a black-start power grid, and the second grid-side converter is connected to the third control module, or control the second grid-side converter to operate by using a P/Q control strategy according to that the grid-side information is that at least one power generation equipment of the black-start power grid is connected to the third grid-side converter and a short-circuit capacity short-circuit ratio of the third grid-side converter exceeds a threshold.
Preferably, the second control module is further configured to control the second network-side converter to operate by using an open-loop V/F control strategy after the second network-side converter is controlled to be unlocked only if the second charging state is that the second network-side converter is in a fully charged state.
The invention also provides terminal equipment, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the power grid black start control method for flexible direct current power transmission according to an instruction in the program code.
According to the technical scheme, the embodiment of the invention has the following advantages: the power grid black start control method, device and equipment for the flexible direct current power transmission are applied to a power grid black start system for the flexible direct current power transmission, and the method comprises the following steps: acquiring a first charging state of a first network side converter, determining and controlling the first network side converter to be unlocked according to the first charging state, controlling the first network side converter to operate by adopting a constant direct-current voltage control strategy, and acquiring a second charging state of a second network side converter at the same time; determining to control the second network side converter to be unlocked according to the second charging state, controlling the second network side converter to operate by adopting an open-loop V/F control strategy and acquiring network side information of a black-start power grid; and determining to adopt a closed-loop V/F control strategy or a P/Q control strategy to control the second grid-side converter to operate according to the grid-side information. According to the power grid black-start control method for the flexible direct-current power transmission, the black-start power grid is started by selecting the control strategy according to the charging states of the first grid-side converter and the second grid-side converter; and the closed-loop V/F control strategy or the P/Q control strategy is automatically switched by the second network side converter according to the network side information of the second network side converter, so that the high-frequency resonance risk at the initial stage of black start is reduced, the medium-stage AC fault ride-through capability of black start is realized, the operation stability of the black start process is improved, and the technical problem that the flexible DC control strategy of the power network side at the black start stage cannot be correspondingly adjusted due to the wiring change in the conventional flexible DC black start technology is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart illustrating steps of a power grid black start control method for flexible direct current power transmission according to an embodiment of the present invention;
fig. 2 is a schematic frame diagram of a black start system of a flexible dc power transmission grid according to an embodiment of the present invention;
fig. 3 is a block diagram of a black-start control device of a flexible dc power transmission grid according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical terms of the embodiments of the present application:
the V/F control refers to selecting a fixed alternating voltage amplitude V or a fixed alternating voltage frequency F of a certain device in the flexible direct current transmission system to control the operation of the corresponding device.
The P/Q control refers to the selection of a certain device in the flexible direct current transmission system to determine the active power P and the reactive power Q thereof to control the operation of the corresponding device.
The embodiment of the application provides a power grid black start control method, device and equipment for flexible direct current power transmission, which are applied to a power grid black start system for flexible direct current power transmission and are used for solving the technical problem that a direct current control strategy on a power grid side at a black start stage in the conventional flexible direct current black start technology cannot be adjusted correspondingly due to wiring change of the direct current control strategy.
The first embodiment is as follows:
fig. 1 is a flowchart illustrating steps of a power grid black-start control method for flexible direct current power transmission according to an embodiment of the present invention, and fig. 2 is a schematic diagram illustrating a framework of a power grid black-start system for flexible direct current power transmission according to an embodiment of the present invention.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a grid black start control method for flexible direct current transmission, which is applied to a grid black start system for flexible direct current transmission, where the grid black start system for flexible direct current transmission includes a first grid 10, a black start grid 20, and a flexible direct current transmission system 30 connecting the first grid 10 and the black start grid 20, and the flexible direct current transmission system 30 includes a first grid-side converter 31 for connecting with the first grid 10 and a second grid-side converter 32 for connecting with the black start grid 20.
It should be noted that the first grid 10 may be a normal grid, the first grid 10 is connected to a first grid-side converter 31, the black-start grid 20 is connected to a second grid-side converter 32 of the flexible dc transmission system 30, and the first grid-side converter 31 and the second grid-side converter 32 are connected on a dc side. The first power grid 10 includes a normally operating ac transmission line, a load, a power generation device (such as a thermal power plant), and the like; the black start power grid 20 includes a stopped ac transmission line, loads, power generation equipment (e.g., a power plant), and the like. The power grid black start system for the flexible direct current power transmission charges an alternating current power transmission line, a load, a power plant and the like of the black start power grid 20 through the first power grid 10 and the flexible direct current power transmission system 30, and the black start power grid is started.
As shown in fig. 1, the power grid black start control method for flexible direct current transmission includes the following steps:
s1, a first charging state of a first network side converter is obtained, the first network side converter is determined and controlled to be unlocked according to the first charging state, the first network side converter is controlled to operate by adopting a constant direct current voltage control strategy, and a second charging state of a second network side converter is obtained at the same time.
Further, before the first charging state of the first grid-side converter is obtained, the power grid black start control method for the flexible direct current power transmission comprises the following steps: the first grid-side converter is charged via the first power grid.
In the embodiment of the present invention, the controlling the operation of the first grid-side converter by using the constant dc voltage control strategy includes: and controlling the direct-current side voltage of the first grid side converter to be the voltage rated value of the flexible direct-current transmission system, and simultaneously charging the second grid side converter through the first power grid.
In step S10, first, charging the first grid-side converter through the first power grid, then controlling the first grid-side converter to unlock according to that the first charging state of the first grid-side converter is the charging state, and after unlocking, controlling the dc-side voltage of the first grid-side converter to be the voltage rating of the flexible dc power transmission system, that is, controlling the first grid-side converter to operate by using a constant dc-voltage control strategy; and simultaneously transmitting the power supplied by the first power grid to the second grid-side converter to charge the second grid-side converter.
S2, determining and controlling the second network side converter to unlock according to the second charging state, controlling the second network side converter to operate by adopting an open-loop V/F control strategy, and acquiring network side information of the black-start power grid.
And further, only the second charging state is that the second network side converter is in a fully charged state, and after the second network side converter is controlled to be unlocked, the second network side converter is controlled to operate by adopting an open-loop V/F control strategy.
It should be noted that, in step S2, the second network-side converter is unlocked mainly according to that the second network-side converter is in a fully charged state, and after the second network-side converter is unlocked, an open-loop V/F control strategy is adopted to control the second network-side converter to operate.
And S3, determining to adopt a closed-loop V/F control strategy or a P/Q control strategy to control the second network side converter to operate according to the network side information.
Further, determining to control the operation of the second grid-side converter by using a closed-loop V/F control strategy or a P/Q control strategy according to the grid-side information comprises:
if the grid side information indicates that at least one alternating current transmission line and at least one load of the black-start power grid are connected with the second grid side converter, controlling the second grid side converter to operate by adopting a closed-loop V/F control strategy;
and if the grid side information indicates that at least one power generation device of the black-start power grid is connected with the second grid side converter and the short-circuit capacity short-circuit ratio of the second grid side converter exceeds a threshold value, controlling the second grid side converter to operate by adopting a P/Q control strategy.
It should be noted that, in step S3, the closed-loop V/F control strategy or the P/Q control strategy is mainly selected according to the grid-side information to control the operation of the second grid-side converter. In this embodiment, the second grid-side converter is connected to one or more ac transmission lines and one or more loads of the black-start power grid, and then the second grid-side converter is switched to a closed-loop V/F control strategy to control the operation of the second grid-side converter. And the second grid-side converter is connected with one or more power generation devices of the black-start power grid, and the short-circuit capacity short-circuit ratio of the second grid-side converter exceeds a threshold value, the second grid-side converter is switched to a P/Q control strategy to control the operation of the second grid-side converter. The threshold value may be set according to requirements, and in this embodiment, the threshold value is preferably 2.5.
The invention provides a power grid black start control method for flexible direct current transmission, which is applied to a power grid black start system for flexible direct current transmission, and comprises the steps of obtaining a first charging state of a first grid side converter, determining and controlling the first grid side converter to be unlocked according to the first charging state, controlling the first grid side converter to operate by adopting a constant direct current voltage control strategy, and obtaining a second charging state of a second grid side converter at the same time; determining to control the second network side converter to be unlocked according to the second charging state, controlling the second network side converter to operate by adopting an open-loop V/F control strategy and acquiring network side information of a black-start power grid; and determining to adopt a closed-loop V/F control strategy or a P/Q control strategy to control the second grid-side converter to operate according to the grid-side information. According to the power grid black-start control method for the flexible direct-current transmission, the black-start power grid is started by selecting the control strategy according to the charging states of the first grid-side converter and the second grid-side converter; and the closed-loop V/F control strategy or the P/Q control strategy is automatically switched by the second network side converter according to the network side information of the second network side converter, so that the high-frequency resonance risk at the initial stage of black start is reduced, the medium-stage AC fault ride-through capability of black start is realized, the operation stability of the black start process is improved, and the technical problem that the flexible DC control strategy of the power network side at the black start stage cannot be correspondingly adjusted due to the wiring change in the conventional flexible DC black start technology is solved.
In an embodiment of the invention, after determining that a closed-loop V/F control strategy or a P/Q control strategy is adopted to control a second grid-side converter to operate according to grid-side information, the power grid black start control method for flexible direct current power transmission includes: and if the second grid-side converter is also connected with the load and the power generation equipment of the black-start power grid, ending the black-start process of the power grid.
It should be noted that the black start process of the power grid is ended, which indicates that the flexible direct current transmission can normally operate.
Example two:
fig. 3 is a block diagram of a black start control device of a flexible dc power transmission grid according to an embodiment of the present invention.
As shown in fig. 3, an embodiment of the present invention further provides a black-start control device for a power grid for flexible direct-current power transmission, which is applied to a black-start system for a power grid for flexible direct-current power transmission, where the black-start system for a power grid for flexible direct-current power transmission includes a first power grid, a black-start power grid, and a flexible direct-current power transmission system that connects the first power grid and the black-start power grid, the flexible direct-current power transmission system includes a first grid-side converter for connecting with the first power grid and a second grid-side converter for connecting with the black-start power grid, and the black-start control device for a power grid for flexible direct-current power transmission includes a first control module 10, a second control module 20, and a third control module 30;
the first control module 10 is configured to acquire a first charging state of the first network side converter, determine to control unlocking of the first network side converter according to the first charging state, control operation of the first network side converter by using a constant direct-current voltage control strategy, and acquire a second charging state of the second network side converter at the same time;
the second control module 20 is configured to determine to control the unlocking of the second network side converter according to the second charging state, control the operation of the second network side converter by using an open-loop V/F control strategy, and acquire network side information of the black-start power grid;
and the third control module 30 is configured to determine to control the operation of the second grid-side converter by using a closed-loop V/F control strategy or a P/Q control strategy according to the grid-side information.
In this embodiment, the third control module 30 is further configured to control the second grid-side converter to operate by using a closed-loop V/F control strategy according to that the grid-side information is that at least one ac transmission line and at least one load of the black-start power grid are connected to the second grid-side converter, or control the second grid-side converter to operate by using a P/Q control strategy when the grid-side information is that at least one power generation equipment of the black-start power grid is connected to the second grid-side converter and a short-circuit capacity short-circuit ratio of the second grid-side converter exceeds a threshold.
In this embodiment, the second control module 20 is further configured to control the second network-side converter to operate by using an open-loop V/F control strategy after the second network-side converter is controlled to be unlocked, where only the second charging state is a full-charging state of the second network-side converter.
It should be noted that the modules in the second embodiment correspond to the steps in the first embodiment, the contents of the grid black start control method for flexible direct current power transmission and the grid black start system for flexible direct current power transmission are already described in detail in the first embodiment, and the contents of the modules and the grid black start system for flexible direct current power transmission in the second embodiment are not described in detail in this second embodiment.
Example three:
the embodiment of the invention provides terminal equipment, which comprises a processor and a memory;
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the power grid black start control method of the flexible direct current power transmission according to the instructions in the program codes.
It should be noted that, the processor is configured to execute the steps in the foregoing power grid black start control method for flexible direct current power transmission according to the instructions in the program code. Alternatively, the processor, when executing the computer program, implements the functions of each module/unit in each system/apparatus embodiment described above.
Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present application. One or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of a computer program in a terminal device.
The terminal device may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the terminal device is not limited and may include more or fewer components than those shown, or some components may be combined, or different components, e.g., the terminal device may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal device. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A power grid black-start control method for flexible direct current transmission is applied to a power grid black-start system for flexible direct current transmission, the power grid black-start system for flexible direct current transmission comprises a first power grid, a black-start power grid and a flexible direct current transmission system for connecting the first power grid and the black-start power grid, the flexible direct current transmission system comprises a first grid side converter for connecting with the first power grid and a second grid side converter for connecting with the black-start power grid, and the power grid black-start control method for flexible direct current transmission comprises the following steps:
the method comprises the steps of obtaining a first charging state of a first network side converter, determining and controlling the first network side converter to be unlocked according to the first charging state, controlling the first network side converter to operate by adopting a constant direct-current voltage control strategy, and obtaining a second charging state of a second network side converter at the same time;
determining to control a second network side converter to be unlocked according to the second charging state, controlling the second network side converter to operate by adopting an open-loop V/F control strategy, and acquiring network side information of a black-start power grid;
and determining to adopt a closed-loop V/F control strategy or a P/Q control strategy to control the second grid-side converter to operate according to the grid-side information.
2. The grid black start control method for flexible direct current transmission according to claim 1, wherein determining to control the second grid-side converter to operate by using a closed-loop V/F control strategy or a P/Q control strategy according to the grid-side information comprises:
if the grid side information is that at least one alternating current transmission line and at least one load of a black-start power grid are connected with the second grid side converter, controlling the second grid side converter to operate by adopting a closed-loop V/F control strategy;
and if the grid side information is that at least one power generation device of the black-start power grid is connected with the second grid side converter and the short-circuit capacity short-circuit ratio of the second grid side converter exceeds a threshold value, controlling the second grid side converter to operate by adopting a P/Q control strategy.
3. The grid black-start control method for the flexible direct-current transmission according to claim 1, wherein determining to control the second grid-side converter to be unlocked according to the second charging state and controlling the second grid-side converter to operate by using an open-loop V/F control strategy comprises: and only if the second charging state is that the second network side converter is in a fully charged state, and after the second network side converter is controlled to be unlocked, the second network side converter is controlled to operate by adopting an open-loop V/F control strategy.
4. The method for controlling black start of a power grid for flexible direct current transmission according to claim 1, wherein the step of controlling the operation of the first grid-side converter by using the constant direct current voltage control strategy comprises: and controlling the direct-current side voltage of the first grid-side converter to be the voltage rated value of the flexible direct-current transmission system, and simultaneously charging the second grid-side converter through the first power grid.
5. The grid black start control method for flexible direct current transmission according to claim 1, wherein before the first state of charge of the first grid-side converter is obtained, the grid black start control method for flexible direct current transmission comprises: charging the first grid-side converter through the first electrical grid.
6. The power grid black start control device for the flexible direct current power transmission is applied to a power grid black start system for the flexible direct current power transmission, the power grid black start system for the flexible direct current power transmission comprises a first power grid, a black start power grid and a flexible direct current power transmission system for connecting the first power grid and the black start power grid, the flexible direct current power transmission system comprises a first grid side converter for connecting with the first power grid and a second grid side converter for connecting with the black start power grid, and the power grid black start control device for the flexible direct current power transmission comprises a first control module, a second control module and a third control module;
the first control module is used for acquiring a first charging state of the first network side converter, determining and controlling the first network side converter to be unlocked according to the first charging state, controlling the first network side converter to operate by adopting a constant direct-current voltage control strategy and acquiring a second charging state of the second network side converter at the same time;
the second control module is used for determining and controlling the second network side converter to be unlocked according to the second charging state, controlling the second network side converter to operate by adopting an open-loop V/F control strategy and acquiring network side information of a black-start power grid;
and the third control module is used for determining to adopt a closed-loop V/F control strategy or a P/Q control strategy to control the second grid-side converter to operate according to the grid-side information.
7. The grid black-start control device for flexible direct-current transmission according to claim 6, wherein the third control module is further configured to control the second grid-side converter to operate by using a closed-loop V/F control strategy according to that the grid-side information is that at least one alternating-current transmission line and at least one load of a black-start grid are connected to the second grid-side converter, or the grid-side information is that at least one power generation equipment of the black-start grid is connected to the second grid-side converter and a short-circuit capacity short-circuit ratio of the second grid-side converter exceeds a threshold value, and control the second grid-side converter to operate by using a P/Q control strategy.
8. The grid black-start control device for flexible direct-current transmission according to claim 6, wherein the second control module is further configured to control the second grid-side converter to operate by using an open-loop V/F control strategy after the second grid-side converter is controlled to be unlocked only when the second charging state is the full-charging state of the second grid-side converter.
9. A terminal device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the grid black start control method for flexible direct current transmission according to any one of claims 1 to 5 according to instructions in the program code.
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| CN202211582260.5A CN115800356A (en) | 2022-12-09 | 2022-12-09 | Power grid black start control method, device and equipment for flexible direct current transmission |
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| CN202211582260.5A CN115800356A (en) | 2022-12-09 | 2022-12-09 | Power grid black start control method, device and equipment for flexible direct current transmission |
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