CN111313387B - Flexible direct-current power grid layered architecture control protection system and protection method - Google Patents
Flexible direct-current power grid layered architecture control protection system and protection method Download PDFInfo
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- CN111313387B CN111313387B CN202010243672.0A CN202010243672A CN111313387B CN 111313387 B CN111313387 B CN 111313387B CN 202010243672 A CN202010243672 A CN 202010243672A CN 111313387 B CN111313387 B CN 111313387B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- 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
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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The invention discloses a flexible direct current power grid layered architecture control protection system and a protection method, wherein the system comprises the following steps: the upper master control station is responsible for controlling and coordinating the input and the removal of the slave stations; the station control system of the middle layer and the pole control protection system of the converter station are mutually independent devices, are responsible for the communication of the integral control protection function of the slave station and the master control station, and are control execution units of the master control station; the slave stations of the lower layer are a plurality of flexible direct current converter stations which comprise flexible direct current converters and high-voltage direct current circuit breakers. And the master control station judges whether the AC side of the converter station is a weak AC system or not according to the state quantity of the AC system upstream from the slave station in combination with the DC power transceiving condition of the slave station, reduces the DC power throughput of the converter station if the AC side of the converter station is the weak AC system, and judges that the AC side is an extremely weak system master control station to actively lock the DC bus outlet of the converter station. The embodiment provided by the invention not only controls the voltage and power distribution of the direct current bus of the flexible direct current power grid, but also controls the switching state of the slave station, and has complete interface protocol content and complete control function.
Description
Technical Field
The invention relates to the field of power electronics and power systems, in particular to a flexible direct current power grid layered architecture control protection system and a flexible direct current power grid layered architecture protection method.
Background
With the continuous development of the flexible direct current transmission technology, the flexible direct current power grid becomes a necessary trend, the number of converter stations is increased, the mutual influence of the converter stations is increased, and higher requirements are provided for the control strategy of the converter stations. At present, control strategies of a voltage source converter-based multi-terminal flexible direct current transmission (VSC-MTDC) system mainly include master-slave control, voltage droop control, voltage margin control, combination control of the master-slave control, the voltage droop control and the voltage margin control, and the like, and each control strategy has an application range.
In a multi-terminal flexible direct current power transmission system, the stability of direct current voltage directly affects the stability of direct current power flow, and therefore, in the multi-terminal flexible direct current power transmission system, the control of direct current voltage is very important. The master-slave control strategy is a control strategy requiring communication between the converter stations, and the control mode realizes the stability of direct-current voltage by utilizing a communication system between the converter stations. The direct-current voltage deviation control strategy is a control strategy without inter-station communication, and the essence of the control strategy is that after a fixed direct-current voltage station fails and exits operation, a backup fixed direct-current voltage station can detect large deviation of direct-current voltage and enter a fixed direct-current voltage operation mode, so that stability of the direct-current voltage is guaranteed, in the conventional master-slave control theory research and engineering practice, an address selection method of a master control station is not deeply researched, a converter station is generally selected as the master control station, an auxiliary system (function) is developed in a PCP (primary control protocol) of the converter station serving as the master control station to serve as a physical support of the master control station control system, and the protection effect is poor.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor protection effect of the flexible direct current power grid protection system in the prior art, so as to provide a flexible direct current power grid layered architecture control protection system and a protection method.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a flexible direct current power grid hierarchical architecture control protection system, including: the upper master control station is responsible for controlling and coordinating the input and the removal of the slave stations; the station control system of the middle layer and the pole control protection system of the converter station are mutually independent devices and are responsible for finishing the communication of the integral control protection function of the slave station and the master control station as a control execution unit of the master control station; the slave station of the lower layer comprises a plurality of flexible direct current converter stations, and the flexible direct current converter stations comprise flexible direct current converters and high-voltage direct current circuit breakers.
In one embodiment, the master control station is geographically physically the central point of the grid, and the spatial distance from the master control station to each converter station is the physical distance of the optical fiber communication length.
In one embodiment, the master station controls the time alignment of the converter stations based on their communication delay values to the slave stations.
In one embodiment, the uplink state protocol of the master station and the slave station comprises: this station running state volume, this station direct current state volume, this station interchange state volume, wherein this station running state volume includes: the method comprises the following steps of (1) running/cutting off a converter station, unlocking and locking a positive pole converter, unlocking and locking a negative pole converter, cutting off a positive pole bus and cutting off a negative pole bus; the station direct current state quantity comprises: the positive electrode voltage average value, the negative electrode voltage average value, the positive electrode current average value, the negative electrode current average value and the direct current active power; the station alternating current state quantity comprises: the alternating current voltage effective value, the alternating current reactive power, the alternating voltage negative sequence content, the alternating voltage zero sequence content, the alternating voltage frequency offset, the alternating current negative sequence content, the alternating current zero sequence content and the alternating current THD data.
In one embodiment, the downlink control protocol of the master station and the slave station comprises: the control quantity of the running state, the control quantity of the direct current state and the control quantity of the alternating current state, wherein the control quantity of the running state comprises: the method comprises the following steps of (1) running/cutting of a converter station, an unlocking and locking state of a positive pole converter, an unlocking and locking state of a negative pole converter, a cutting state of a positive pole bus, a cutting state of a negative pole bus and a running mode of the converter station; the direct current state control quantity comprises direct current active power; the ac state control quantity includes ac reactive power.
In a second aspect, an embodiment of the present invention provides a method for controlling and protecting a flexible direct current power grid hierarchical architecture, including: and the master control station judges whether the AC side of the converter station is a weak AC system or not according to the state quantity of the AC system upstream from the slave station and by combining the DC power transceiving condition of the slave station, reduces the DC power throughput of the converter station if the AC side is the weak system, and actively locks the DC bus outlet of the converter station if the AC side is judged to be the extremely weak system.
In one embodiment, when the slave stations are used for distributed new energy source side access and are responsible for receiving direct current power transmitted by the new energy source slave stations and feeding the direct current power into the alternating current main network, the master control station detects the system state of a grid-connected point of the alternating current main network, and if large disturbance of the grid-connected point occurs, the master control station locks each new energy source slave station sequentially according to a preset priority level.
In one embodiment, the control object of the master control station for switching on/off control is the open circuit at the alternating current side of the converter station; when the master control station switches the unlocking state and the bus cutting state of the positive/negative pole converter, only the direct current breaker is controlled, and the direct current breaker is not linked with the converter; the main control station controls the operation mode, active power and reactive power of the converter station, and the control objects are the station control system and the converter.
In one embodiment, when the slave station alternating-current voltage effective value, the current effective value and the current effective value are not in a preset range, the master station controls to reduce the active power input/output; when the alternating-current voltage negative sequence content, the voltage zero sequence content, the current negative sequence content and the current zero sequence content of the slave station are greater than preset thresholds, temporarily cutting off a direct-current bus by the master control station, continuously presetting times for each time, and locking a current converter if the alternating-current voltage negative sequence content, the voltage zero sequence content, the current negative sequence content and the current zero sequence content are still greater than the preset thresholds; and when the alternating current THD data of the slave station is greater than a preset threshold value, temporarily locking the converter for each preset time for a preset number of times, and if the alternating current THD data of the slave station is greater than a preset threshold value limit, permanently locking the converter.
In one embodiment, the parameter control limit range of the master control station is narrower than the control range of the station control system at the self station.
The technical scheme of the invention has the following advantages:
1. according to the layered architecture control protection system of the flexible direct current power grid, a master control station on the upper layer is responsible for controlling and coordinating input and removal of slave stations; the station control system of the middle layer and the pole control protection system of the converter station are mutually independent devices, are responsible for the communication of the integral control protection function of the slave station and the master control station, and are control execution units of the master control station; the slave stations of the lower layer comprise a plurality of flexible direct current converter stations which comprise flexible direct current converters and high-voltage direct current breakers. The main control station independently exists in a geographic space, the spatial distance from the main control station to each converter station is the physical distance of the optical fiber communication length, and the influence of the communication delay between the stations realizes the time alignment effect of each converter station on the control function.
2. The invention provides a flexible direct current power grid layered architecture control protection method.A master control station judges whether an alternating current side of a convertor station is a weak alternating current system or not according to the state quantity of an alternating current system ascending from a slave station and the condition of receiving and sending direct current power of the slave station, reduces the direct current power swallowing quantity of the convertor station if the alternating current side is the weak system, and judges that the alternating current side is an extremely weak system master control station to actively lock a direct current bus outlet of the convertor station. The direct-current bus voltage and power distribution of the flexible direct-current power grid are controlled, the switching state of the slave station is controlled, the interface protocol content is complete, and the control function is complete.
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 some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a specific example of a flexible direct current power grid hierarchical architecture control protection system according to an embodiment of the present invention;
fig. 2 is a structural diagram of a single-ended bipolar flexible direct current converter station according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a communication connection relationship between a master control station and a multi-terminal converter station network according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the main control station and the shunt delay synchronization of each converter station in the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
An embodiment of the present invention provides a flexible direct current power grid hierarchical architecture control protection system, as shown in fig. 1, including: the upper main Control station Control _ S is responsible for controlling and coordinating the input and the removal of the slave station; the station control system PCP of the middle layer and the pole control protection system CCP of the converter station are mutually independent devices and are responsible for finishing the communication of the whole control protection function of the slave station and the master control station and used as a control execution unit of the master control station; the slave station of the lower layer comprises a plurality of flexible direct current converter stations VSC _ Sx (x is 1 to n), and the flexible direct current converter stations comprise flexible direct current converters and high-voltage direct current breakers. A structure diagram of a single-ended bipolar flexible direct current converter station is shown in figure 2, a slave station is composed of a flexible direct current converter and a high-voltage direct current breaker together, and a bidirectional dotted line means bidirectional optical fiber communication.
The main control station of the embodiment of the invention is a physical central point of a flexible direct current power grid in a geographical space in site selection, and the spatial distance from the main control station to each converter station is the physical distance of the optical fiber communication length. As shown in fig. 3, taking 6 converter stations as an example, L1-L6 are spatial distances from a main control station to each converter station, and the distances are physical distances of optical fiber communication lengths, and in the site selection, in combination with the objective situation of a flexible direct current power grid to be constructed, the main control station is set at a physical central point of the power grid as much as possible, so that L1-L6 are as close to equal as possible. After the site selection of the main control station is completed and the construction of the optical fiber communication network of the flexible direct current power grid is completed, as shown in fig. 4, the communication delay values from the main control station to the slave stations are measured and recorded as Δ t1- Δ t6, the delay values are used as the delay values for issuing instructions of the converter stations by the main control station, and meanwhile, the time of the uplink state of the converter stations also takes the values into consideration, so that the time alignment effect of the converter stations on the control function can be realized.
The communication contents of the main control station and each converter station in the flexible direct current power network are realized through different protocols, the communication contents comprise a station running state, a direct current control running state and an alternating current control running state, and the uplink communication from the VSC converter station to the main control station is shown in the following table:
the content of the downlink communication from the master control station to the VSC converter station is shown in the following table:
| serial number | Parameter(s) |
| Type (B) | Control quantity of running |
| 1 | Converter station operation/cut-off |
| 2 | Positive pole converter unblocking state |
| 3 | Negative pole converter unblocking state |
| 4 | Positive bus bar cut-off state |
| 5 | Negative bus bar cut-off state |
| 6 | Converter station mode of operation |
| Type (B) | DC |
| 1 | DC active power |
| Type (B) | Control quantity of |
| 1 | AC reactive power |
The communication protocol content provided by the embodiment of the invention is the lowest requirement, and the specific data format, the specific data length and the specific communication frame rate are different according to different projects.
According to the layered architecture control protection system of the flexible direct current power grid, a master control station on the upper layer is responsible for controlling and coordinating input and removal of slave stations; the station control system of the middle layer and the pole control protection system of the converter station are mutually independent devices and are responsible for finishing the communication of the integral control protection function of the slave station and the master control station as a control execution unit of the master control station; the slave station of the lower layer comprises a plurality of flexible direct current converters, the master control station independently exists in a geographic space, the spatial distance from the master control station to each converter station is the physical distance of the optical fiber communication length, and the influence of the communication delay between the stations is realized, so that the time alignment effect of each converter station on the control function is realized.
Example 2
The embodiment of the invention provides a control protection method for a flexible direct current power grid layered architecture, which is mainly a logic for cutting off and locking a direct current bus of a converter station, and comprises the following steps: the master control station judges whether the alternating current side of the converter station is a weak alternating current system or not according to the state quantity (particularly the voltage, the negative sequence and the zero sequence content of the alternating current, the alternating current THD value and the like of the alternating current system running from the slave station) of the alternating current system and the direct current power receiving and sending condition of the slave station, reduces the direct current power swallowing quantity of the converter station if the alternating current side is the weak system, and actively locks the direct current bus outlet of the converter station if the alternating current side is judged to be the extremely weak system.
In the embodiment of the invention, the master control station can also monitor the alternating current system state of one side of the converter stations of the main parallel-alternating current main network, particularly when the flexible direct current power grid is applied to the occasion of new energy grid connection, a plurality of slave stations are used for distributed new energy power supply side access, one converter station and two converter stations are responsible for receiving the direct current power sent by the new energy slave stations and feeding the direct current power into the alternating current main network, at the moment, the master control station detects the grid connection point system state of the alternating current main network, and if large disturbance of a grid connection point occurs, the master control station can gradually lock each new energy slave station according to a pre-agreed priority level.
The master control station can control the start and stop and the alternating current grid connection of each slave station in the flexible direct current power grid by issuing a converter station cutting instruction, and the engineering practical value of the master control station is that the master control station can control each slave station in a centralized mode in the grid connection debugging process and the off-line maintenance process of a middle individual converter station, so that the unattended operation of each converter slave station is realized.
In the embodiment of the invention, the control object of the main control station for switching on/off control is the AC side open circuit of the converter station; when the master control station switches the unlocking state and the bus cutting state of the positive/negative pole converter, only the direct current breaker is controlled, and the direct current breaker is not linked with the converter; the main control station controls the operation mode, active power and reactive power of the converter station, and the control objects are the station control system and the converter. The specific control logic, control logic objects and control descriptions of the master control station are shown in the following table:
in the embodiment of the invention, when the slave station alternating voltage effective value, the current effective value and the current effective value are not in the preset range, the master control station controls and reduces the active power input/output; when the alternating-current voltage negative sequence content, the voltage zero sequence content, the current negative sequence content and the current zero sequence content of the slave station are greater than preset thresholds, temporarily cutting off a direct-current bus by the master control station, continuously presetting times for each time, and locking a current converter if the alternating-current voltage negative sequence content, the voltage zero sequence content, the current negative sequence content and the current zero sequence content are still greater than the preset thresholds; and when the alternating current THD data of the slave station is greater than a preset threshold value, temporarily locking the converter for each preset time for a preset number of times, and if the alternating current THD data of the slave station is greater than a preset threshold value limit, permanently locking the converter. The relation between the AC grid-connected point state of the slave converter station and the control logic of the master control station is shown in the following table, the logic is established in that when the converter station works in an active power output mode, and the active power is a constant value, the logic refers to the AC system quantity listed in the following table, and if the AC system quantity exceeds the limit, the corresponding logic measure is adopted.
The control function of the main control station in the embodiment of the invention is overlapped with the control function item of the PCP, but the parameter control limit range of the main control station is narrower than the control range of the PCP at the self station, the control is performed by the main control station when the control is stable by the main control station, and if the control exceeds the limit range of the main control station, the control capability of the PCP can be used as a backup to be controlled and adjusted in a wider fixed value range.
The control protection method for the hierarchical architecture of the flexible direct current power grid provided by the embodiment of the invention not only controls the voltage and power distribution of the direct current bus of the flexible direct current power grid, but also controls the switching state of the slave station, and has complete interface protocol content and complete control function.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A flexible direct current power grid layered architecture control protection system is characterized by comprising:
the upper master control station is responsible for controlling and coordinating the input and the removal of the slave stations;
the station control system of the middle layer and the pole control protection system of the converter station are mutually independent devices and are responsible for finishing the communication of the integral control protection function of the slave station and the master control station as a control execution unit of the master control station;
the lower-layer slave station comprises a plurality of flexible direct current converter stations, and each flexible direct current converter station comprises a flexible direct current converter and a high-voltage direct current breaker; the uplink state protocol of the master station and the slave station comprises the following steps: this station running state volume, this station direct current state volume, this station interchange state volume, wherein this station running state volume includes: the operation/excision of converter station, anodal transverter unblock state, negative pole transverter unblock state, anodal bus excision state, negative pole bus excision state, this station direct current state quantity includes: the positive electrode voltage average value, the negative electrode voltage average value, the positive electrode current average value, the negative electrode current average value and the direct current active power.
2. The grid layered architecture control protection system according to claim 1, wherein the master control station is geographically a physical center point of the grid layered architecture, and the spatial distance from the master control station to each converter station is a physical distance of the optical fiber communication length.
3. The flexible direct current power grid layered architecture control protection system according to claim 2, wherein the master station controls the time alignment of the converter stations according to communication delay values of the master station to the slave stations.
4. The grid compliant hierarchical architecture control protection system according to claim 1, wherein the local ac state variables include: the alternating current voltage effective value, the alternating current reactive power, the alternating voltage negative sequence content, the alternating voltage zero sequence content, the alternating voltage frequency offset, the alternating current negative sequence content, the alternating current zero sequence content and the alternating current THD data.
5. The grid-flexible layered architecture control protection system according to any one of claims 1 to 3, wherein the downlink control protocols of the master station and the slave station include: the control quantity of the running state, the control quantity of the direct current state and the control quantity of the alternating current state, wherein the control quantity of the running state comprises: the method comprises the following steps of (1) running/cutting of a converter station, an unlocking and locking state of a positive pole converter, an unlocking and locking state of a negative pole converter, a cutting state of a positive pole bus, a cutting state of a negative pole bus and a running mode of the converter station; the direct current state control quantity comprises direct current active power; the ac state control quantity includes ac reactive power.
6. A flexible direct current power grid layered architecture control protection method is characterized by being used for a flexible direct current power grid layered architecture control protection system, and the control protection system comprises the following components:
the upper master control station is responsible for controlling and coordinating the input and the removal of the slave stations; the station control system of the middle layer and the pole control protection system of the converter station are mutually independent devices and are responsible for finishing the communication of the integral control protection function of the slave station and the master control station as a control execution unit of the master control station; the lower-layer slave station comprises a plurality of flexible direct current converter stations, and each flexible direct current converter station comprises a flexible direct current converter and a high-voltage direct current breaker; the uplink state protocol of the master station and the slave station comprises the following steps: this station running state volume, this station direct current state volume, this station interchange state volume, wherein this station running state volume includes: the operation/excision of converter station, anodal transverter unblock state, negative pole transverter unblock state, anodal bus excision state, negative pole bus excision state, this station direct current state quantity includes: the positive electrode voltage average value, the negative electrode voltage average value, the positive electrode current average value, the negative electrode current average value and the direct current active power;
the control protection method comprises the following steps: and the master control station judges whether the AC side of the converter station is a weak AC system or not according to the state quantity of the AC system upstream from the slave station and by combining the DC power transceiving condition of the slave station, reduces the DC power throughput of the converter station if the AC side is the weak system, and actively locks the DC bus outlet of the converter station if the AC side is judged to be the extremely weak system.
7. The flexible direct current power grid layered architecture control protection method is characterized in that when the slave stations are used for distributed new energy power source side access and are responsible for receiving direct current power transmitted by the new energy slave stations and feeding the direct current power into the alternating current main grid, the master control station detects the grid-connected point system state of the alternating current main grid, and if large grid-connected point disturbance occurs, the master control station gradually locks each new energy slave station according to a preset priority level.
8. The flexible direct current power grid layered architecture control protection method according to claim 6, wherein a control object of the master control station for performing switching-on/off control is a converter station alternating current side open circuit;
when the master control station switches the unlocking state and the bus cutting state of the positive/negative pole converter, only the direct current breaker is controlled, and the direct current breaker is not linked with the converter;
the main control station controls the operation mode, active power and reactive power of the converter station, and the control objects are the station control system and the converter.
9. The flexible direct current power grid layered architecture control protection method according to claim 6, wherein when the slave station alternating current voltage effective value, the current effective value and the current effective value are not in a preset range, the master station controls to reduce active power input/output;
when the alternating-current voltage negative sequence content, the voltage zero sequence content, the current negative sequence content and the current zero sequence content of the slave station are greater than preset thresholds, temporarily cutting off a direct-current bus by the master control station, continuously presetting times for each time, and locking a current converter if the alternating-current voltage negative sequence content, the voltage zero sequence content, the current negative sequence content and the current zero sequence content are still greater than the preset thresholds;
and when the alternating current THD data of the slave station is greater than a preset threshold value, temporarily locking the converter for each preset time for a preset number of times, and if the alternating current THD data of the slave station is greater than a preset threshold value limit, permanently locking the converter.
10. The flexible direct current power grid layered architecture control protection method according to any one of claims 6 to 9, wherein a parameter control limit range of the master control station is narrower than a control range of a station control system at the own station.
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