WO2021093403A1

WO2021093403A1 - Control authority switching system and method for parallel multi-terminal high-voltage direct current converter station

Info

Publication number: WO2021093403A1
Application number: PCT/CN2020/110888
Authority: WO
Inventors: 王胜; 陈璐; 吴庆范; 刘旭辉; 宋延涛; 涂仁川; 李乾; 王亚涛; 吴东崛; 刘晨; 王秋开; 王长久; 卢麒; 范保丰
Original assignee: 许继电气股份有限公司; 许继集团有限公司
Priority date: 2019-11-12
Filing date: 2020-08-24
Publication date: 2021-05-20
Also published as: CN110912171A

Abstract

Disclosed are a control authority switching system and method for a parallel multi-terminal high-voltage direct current converter station. The method comprises: when a first high-voltage direct current converter station needs to switch the control authority, it is determined whether a permission condition of a control authority switching request is met, wherein the permission condition of the control authority switching request at least comprises: the communication status between the first high-voltage direct current converter station and other high-voltage direct current converter station at least one terminal is normal; if the permission condition of the control authority switching request is met, the first high-voltage direct current converter station communicates with specific high-voltage direct current converter stations at other terminals to achieve the control authority switching, the specific high-voltage direct current converter station referring to a high-voltage direct current converter station having a normal communication status with the first high-voltage direct current converter station.

Description

Parallel multi-terminal high voltage direct current converter station control authority switching system and method

Cross-references to related applications

This application is filed based on the Chinese patent application with the application number 201911101593.X and the filing date on November 12, 2019, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated by way of introduction. Application.

Technical field

This application relates to the technical field of high-voltage direct current transmission, and in particular to a system and method for switching control authority of a parallel multi-terminal high-voltage direct current converter station.

Background technique

At present, the two-terminal HVDC transmission technology is the most mainstream and most mature technology of HVDC transmission. It has the advantages of large transmission capacity, good operation stability, and low system loss. It has an irreplaceable role in long-distance large-capacity transmission. With the increase in the number of DC transmission lines at both ends, the inflexible operation mode and the tight corridors of the transmission line tower base have become increasingly prominent. Parallel multi-terminal HVDC transmission technology provides a new development direction for conventional DC transmission. Parallel multi-terminal DC transmission The achievable multi-source power supply, multi-drop-point power reception, reduced transmission lines, more flexible operation methods, low investment costs and low operating costs have also become research hotspots in the field of DC transmission.

The parallel three-terminal HVDC project needs to realize the independent control function of the converter station on the equipment or system characteristics of the station according to different operating conditions, and realize the coordinated control function of all the converter stations. This is a pair of parallel three-terminal HVDC systems The switching of the control authority of the station level and system level, system level master station and system level slave station of all converter stations puts forward more flexible and reliable requirements. At present, the three-terminal HVDC project usually switches the control authority according to the set rules, but in the actual project, a certain converter station may encounter failure or overhaul conditions, which causes the control authority switch of other converter stations to be unable to complete reliably , The control authority has poor operating flexibility, which affects the normal operation of the entire DC system.

Summary of the invention

The embodiment of the present application expects to provide a system and method for switching the control authority of a parallel multi-terminal HVDC converter station.

The embodiment of the application provides a parallel multi-terminal high-voltage direct current converter station control authority switching system, the system includes parallel N-terminal high-voltage direct current converter stations, N≥3, each end of the high-voltage direct current converter station is connected through a ring network communication , Each end of the HVDC converter station is configured to: when the local HVDC converter station needs to switch the control authority, it is judged whether the permission condition of the control authority switch request is met, and the permission condition of the control authority switch request at least includes: the local high voltage The communication status between the DC converter station and at least the other end of the HVDC converter station is normal; if the conditions for the control authority switching request are met, the local HVDC converter station and other specific HVDC converter stations at each end will communicate with each other. Communication is used to realize the switching of control authority, and the specific HVDC converter station refers to the HVDC converter station with normal communication status with the local HVDC converter station.

In some optional embodiments of the present application, the permission condition of the control authority switching request further includes: not receiving a system-level master station control authority request or a station-level control authority request sent by the HVDC converter station at each end.

In some optional embodiments of the present application, each end of the HVDC converter station is also configured to detect the communication status with other end HVDC converter stations in real time, and when the local HVDC converter station is detected for the first time If the communication status with any other end of the HVDC converter station is abnormal, and the local HVDC converter station is not in the station-level control state, the current control state will be switched to the station-level control state.

In some optional embodiments of the present application, each end of the HVDC converter station is further configured to: when it is detected that the communication status with the other ends of the HVDC converter station is not normal, then the local HVDC converter is blocked. The system-level master station of the stream station controls the authority request function.

In some optional embodiments of the present application, the mutual communication with other specific HVDC converter stations at each end to achieve control authority switching includes: when the local HVDC converter station is in the control state of the system-level slave station And when it needs to switch to the control state of the system-level master station, the local HVDC converter station sends the system-level master station control authority request to the specific HVDC converter stations at other ends; when the specific HVDC converter stations at other ends After the station receives the control authority request of the system-level master station, if its own control state is not the system-level slave station control state, it will convert its own control state to the system-level slave station control state; other specific high-voltage DC converter stations will change themselves Send the control status information to the local HVDC converter station; after the local HVDC converter station receives the control status information sent by other specific HVDC converter stations at each end, it switches the current control status to the system-level master station Control state.

In some optional embodiments of the present application, the communication with other specific HVDC converter stations at each end to achieve control authority switching includes: when the local HVDC converter station is in a station-level control state and requires When switching to the control state of the system-level master station, the local HVDC converter station sends the system-level master station control authority request to the specific HVDC converter stations at other ends; when the specific HVDC converter stations at other ends receive After reaching the system-level master station control authority request, if its own control status is not the system-level slave station control status, then the own control status will be converted to the system-level slave station control status; other specific HVDC converter stations will control themselves The status information is sent to the local HVDC converter station; after the local HVDC converter station receives the control status information sent by other specific HVDC converter stations at each end, it switches the current control state to the system-level master station control state .

In some optional embodiments of the present application, the mutual communication with other specific HVDC converter stations at each end to achieve control authority switching includes: when the local HVDC converter station is the system-level master station or slave When the station control status needs to be switched to the station-level control status, the local HVDC converter station sends a station-level control authority request to the specific HVDC converter stations at other ends; when the specific HVDC converter stations at other ends After receiving the station-level control authority request, if its own control state is not the station-level control state, it will convert its own control state to the station-level control state; other specific HVDC converter stations at each end will send their own control state information to the local HVDC converter station at the end; the HVDC converter station at the local end will switch the current control state to the station-level control state after receiving the control status information sent by the specific HVDC converter stations at each end.

The embodiment of the application also provides a method for switching the control authority of parallel multi-terminal HVDC converter stations, which is applied to the first HVDC converter station. The system includes parallel N-terminal HVDC converter stations, N≥3; A HVDC converter station is either one of the N-terminal HVDC converter stations; each HVDC converter station is connected via ring network communication; the method includes:

When the first HVDC converter station needs to switch the control authority, it is determined whether the permission condition of the control authority switch request is satisfied. The permission condition of the control authority switch request at least includes: the first HVDC converter station and other at least The communication status between the high-voltage DC converter stations at one end is normal; if the allowable conditions of the control authority switching request are met, it communicates with specific high-voltage DC converter stations at other ends to realize the control authority switching. A converter station refers to a HVDC converter station with a normal communication status with the first HVDC converter station.

In some optional embodiments of the present application, the method further includes: real-time detection of the communication status with other high-voltage DC converter stations at each end. If the communication state is abnormal, and the first high-voltage direct current converter station is not in the station-level control state, the current control state is switched to the station-level control state.

In some optional embodiments of the present application, the method further includes: when it is detected that the communication status with the high-voltage direct current converter station at each end is abnormal, then the first high-voltage direct current converter station locks the original The system-level master station of the terminal controls the authority request function.

In some optional embodiments of the present application, the mutual communication with other specific HVDC converter stations at each end to achieve control authority switching includes:

When the first high-voltage direct current converter station is in the control state of the system-level slave station and needs to be switched to the control state of the system-level master station, sending the system-level master station control authority request to the specific high-voltage direct current converter station at each end;

The first HVDC converter station receives the control state information sent by the specific HVDC converter station at each other end, and switches the current control state to the control state of the system-level master station; wherein, when the other ends After a specific HVDC converter station receives the system-level master station control authority request, if its own control state is not the system-level slave station control state, the other specific HVDC converter stations will convert their own control state to all The system layer slave station controls the status, and sends its own control status information to the first HVDC converter station.

When the first HVDC converter station is in the station-level control state and needs to be switched to the system-level master station control state, send a system-level master station control authority request to specific HVDC converter stations at other ends;

The first HVDC converter station receives the control state information sent by the specific HVDC converter station at each other end, and switches the current control state to the control state of the system-level master station; wherein, when the other ends After the specific HVDC converter station receives the system-level master station control authority request, if its own control state is not the system-level slave station control state, it will convert its own control state to the system-level slave station control state, and send it to the first The HVDC converter station sends its own control status information.

When the first HVDC converter station is in the system-level master station or slave station control state and needs to be switched to the station-level control state, sending a station-level control authority request to specific HVDC converter stations at each end;

The first HVDC converter station receives the control state information sent by the specific HVDC converter station at each other end, and switches the current control state to the station-level control state; wherein, when the specific HVDC converter station at each other end After the HVDC converter station receives the station-level control authority request, if its own control state is not the station-level control state, the specific HVDC converter station at each end will convert its own control state to the station-level control state; and The first HVDC converter station sends its own control status information.

Using the technical solution of the embodiment of the present application, when the HVDC converter station needs to switch the control authority, it is necessary to determine whether the permission condition of the control authority switching request is satisfied. Only when the permission condition is met, that is, at least the local HVDC converter station is guaranteed Only when the communication status with at least one end of the HVDC converter station is normal, the control authority can be switched, which avoids the inability to switch the control authority when the HVDC converter station stops operating due to factors such as maintenance, failure, etc., which will lead to the conversion of the converter station. The problem that the switching of the control authority cannot be completed reliably, which improves the flexibility of the control authority operation.

Description of the drawings

Fig. 1 is a bipolar topology structure of a parallel three-terminal DC transmission system according to an embodiment of the present application;

Figure 2 is a network topology diagram of three-station control authority switching in an embodiment of the present application;

FIG. 3 is a flowchart of selecting a method for switching control authority of a parallel multi-terminal HVDC converter station according to an embodiment of the present application;

FIG. 4 is the logic for switching the control authority of the three-station system layer in an embodiment of the present application;

Fig. 5 is the logic for switching the control authority between the station layer and the system layer in an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings and specific embodiments.

The embodiment of the application provides a parallel multi-terminal high-voltage direct current converter station control authority switching system, the system includes parallel N-terminal high-voltage direct current converter stations, N≥3, each end of the high-voltage direct current converter station is connected through a ring network communication , Each end of the HVDC converter station is configured to: when it is necessary to switch the control authority, it is judged whether the permission condition of the control authority switch request is satisfied. The permission condition of the control authority switch request at least includes: the local HVDC converter station and other at least The communication status between the high-voltage DC converter stations at one end is normal; if the allowable conditions of the control authority switching request are met, it communicates with specific high-voltage DC converter stations at other ends to realize the control authority switching. A converter station refers to a HVDC converter station with normal communication status with the local HVDC converter station.

Exemplarily, as shown in Figure 1, the system includes three-terminal HVDC converter stations, which are respectively denoted as Station A, Station B and Station C. The three-terminal HVDC converter stations are all in a bipolar topology and are connected by DC lines. Connected in parallel. The three-terminal HVDC converter station can be configured as a rectifier station or an inverter station, but the system includes at least one rectifier station and one inverter station at any time, that is, at any time, the stations A, B, and C in the system It includes at least a rectifier station and an inverter station, and the third HVDC converter station can be a rectifier station or an inverter station.

Among them, as shown in Figure 2, each end of the HVDC converter station (ie, station A, station B, and station C) includes an operator control system and a DC station control system. The operator control system and the DC station control system pass through the station's local area network. (LAN, Local Area Network) for communication, the operator control system issues a control authority request and release command to the local DC station control system; for example, the station A operator control system sends a control authority request to the station A DC station control system, Release and other control authority switching commands. Each DC station control system realizes the switching function of the control authority of the three stations through the LAN communication between the dual loop sites; in addition, each DC station control system sends the current control authority status of the station to the station operator control system for display; for example, the station The A DC station control system sends the control authority status to the station A operator control system for the station A operator control system to display the control authority status.

In this embodiment, the communication reliability of the entire system can be ensured by adopting dual-ring network communication. Taking station A as an example, station A preferentially receives data from station B through the inter-station communication between station A and station B. If the inter-station communication between station A and station B fails, it will switch to passing through station A and station C. Inter-station communication receives station B's data. Similarly, station A preferentially receives data from station C through the inter-station communication between station A and station C. If the inter-station communication between station A and station C fails, it will switch to the inter-station communication receiving station through station A and station B. C's data. The selection principle of station B and station C receiving data from the opposite station is the same as that of station A, and will not be repeated here.

In this embodiment, the converter station with the control authority is the system-level control master station, the converter station without the control authority is the system-level control slave station, and each HVDC converter station does not have the control authority, it is the station-level control. . As shown in Figure 1, the system includes a three-terminal HVDC converter station as an example. The control authority status of the three-terminal HVDC converter station includes: 1. One system master station controls and the other two system slave stations; 2. One System master station control, one system slave station control, one station level control; 3. The three converter stations are all under station level control. Among them, the converter station with control authority can realize the functions of system start and stop, power distribution, and three-station sequential control conversion of the three stations. The system slave station or the station layer does not have the control functions such as system start and stop, power distribution, and sequential control conversion for other converter stations.

Based on the above-mentioned parallel multi-terminal HVDC converter station control authority switching system, a parallel multi-terminal HVDC converter station control authority switching method can be realized. This method distinguishes that the communication between this station and the other two stations is faulty, and one of the stations is faulty. The inter-station failure and the communication with the other two stations are normal in three inter-station communication states, which realizes the permission and switching function of different control authority switching functions. These functions satisfy the switching of the independent control mode and the joint control mode of the parallel three-terminal DC engineering converter station, as well as the control authority switching function of the other two normal communication stations for single station maintenance, and improve the flexibility of the parallel three-terminal HVDC system control And convenience. Specifically, the method of this embodiment is applied to a first HVDC converter station, and the first HVDC converter station is any one of the N-terminal HVDC converter stations; then, Methods include:

When the first HVDC converter station needs to switch the control authority, it is determined whether the permission condition of the control authority switch request is satisfied. The permission condition of the control authority switch request at least includes: the first HVDC converter station and other at least The communication status between the HVDC converter stations at one end is normal;

If the allowable condition of the control authority switching request is met, it communicates with other specific HVDC converter stations at each end to realize the control authority switching, and the specific HVDC converter station refers to the first HVDC converter station. HVDC converter station with normal communication status between stations.

In some optional embodiments, in order to avoid conflicts, the permission condition of the control authority switching request further includes: not receiving a system-level master station control authority request or a station-level control authority request sent by a high-voltage direct current converter station at each end.

In some optional embodiments, in order to achieve reliable control, the method further includes: real-time detection of the communication status with other high-voltage DC converter stations at each end. If the communication state between the two is abnormal, and the first HVDC converter station is not in the station-level control state, the current control state is switched to the station-level control state.

In some optional embodiments, in order to avoid switching to the system master station when the local converter station fails, the method further includes: when it is detected that the communication status with other high-voltage DC converter stations is not normal , The first HVDC converter station blocks the control authority request function of the system-level master station at the local end.

In some optional embodiments, in order to realize the control authority switching, the communication with other specific HVDC converter stations at each end to realize the control authority switching includes: when the first HVDC converter station is the system When the control state of the floor slave station needs to be switched to the control state of the system floor master station, the system-level master station control authority request is sent to the specific HVDC converter station at each end; the first HVDC converter station receives all According to the control status information sent by the specific HVDC converter station at each end, the current control state is switched to the control state of the system-level master station; wherein, when the specific HVDC converter station at each other end receives the system-level master station After the station control authority is requested, if its own control status is not the system-level slave station control status, the specific HVDC converter station at each end will convert its own control status to the system-level slave station control status, and send it to the system-level slave station control status. The first HVDC converter station sends its own control status information.

In some optional embodiments, in order to realize the control authority switching, the communication with other specific HVDC converter stations at each end to realize the control authority switching includes: when the first HVDC converter station is the station When the control state of the system layer needs to be switched to the control state of the system layer master station, the system layer master station control authority request is sent to the specific HVDC converter station at each end; the first HVDC converter station receives the other The control status information sent by the specific HVDC converter station at each end switches the current control state to the control state of the system-level master station; wherein, when the other specific HVDC converter stations at each end receive the system-level master station control After the permission request, if the own control state is not the system-level slave station control state, the own control state is converted to the system-level slave station control state, and the own control state information is sent to the first HVDC converter station.

In some optional embodiments, in order to realize the control authority switching, the communication with other specific HVDC converter stations at each end to realize the control authority switching includes: when the first HVDC converter station is the system When the control state of the master station or the slave station on the floor and needs to be switched to the station-level control state, the station-level control authority request is sent to the specific high-voltage direct current converter station at each end; the first high-voltage direct current converter station receives the The control status information sent by the specific HVDC converter station at each other end switches the current control state to the station-level control state; wherein, when the specific HVDC converter station at each other end receives the station-level control authority request If its own control state is not the station-level control state, the specific HVDC converter station at each end will convert its own control state to the station-level control state; and send its own control to the first HVDC converter station status information.

The following takes the three-terminal HVDC converter station shown in Figure 1 as an example for description. As shown in Figure 3, the method may include: the local HVDC converter station (i.e. the first HVDC converter station) detects in real time the communication status between the local HVDC converter station and the other HVDC converter stations (i.e. the local HVDC converter station and other If the communication between the local terminal (also called the local station) and the other two terminals are both faulty (that is, the communication between the stations 1 and 2 is faulty), the control authority of the local terminal is Forcibly switch to station-level control, and lock the local system-level master station control authority request function; if the communication between the local terminal and the first end of the other two ends fails, the local control authority is forced to switch to station-level control , And open the control authority switching function between the local end and the second end of the other two ends; if the communication between the local end and the other two ends is normal, open the control authority switching between the local end and the other two ends Features.

Among them, the process of judging whether the communication between the local terminal and the other terminal is faulty may include: the communication link between the local station and the opposite station 1 is faulty, the communication link between the local station and the opposite station 2 is normal, and the local station receives the opposite station 2 and If the communication link failure signal of the opposite station 1 is signaled, it is judged that the communication between the local station and the opposite station 1 is faulty. The method for judging communication failures between this station and station 2 is similar, so I won't go into details here.

Since the control authority switching process between the local end and the second end of the other two ends is exactly the same as the control authority switching process between the local end and the other two ends, the communication between the local end and the other two ends is normal. As an example, the specific process of controlling authority switching is as follows:

Scenario 1: According to the switching logic of the three-station system-level control authority, as shown in Figure 4, when the HVDC converter station needs to switch the control authority, the HVDC converter station is the operating personnel control system of the system-level slave station control state Possess the authority to issue system-level master station control authority requests, and pass the request to the DC station control system of the other two HVDC converter stations through inter-station communication. After the HVDC converter station is in the control state of the system-level master station, the station control system receives the system-level master station control authority request for the station, and the operator control system of this station has the authority to issue the system-level master station control authority release command. , After the DC station control system of this station receives the control authority release command, it forces the control status of the system-level master station of the station to the system-level slave control status, and transmits the information about the control status of the system-level slave station of the station to the other DC station control system for two converter stations. After the HVDC converter station that originally applied for the master station control authority request receives the system-level slave station control status information of the other two stations, it forces the system-level slave station control status of the station to switch to the system-level master station control status.

Among them, when issuing a system-level master station control authority request, it is necessary to determine whether the control authority switching request permission condition is met. The control authority switching request permission condition is the control state of the system-level slave station, and the relationship between the local station and at least one other station The communication status between stations is normal, and there is no request for the control authority of the station or the system-level master station or station-level of the station. The system-level master station control authority release permission condition is that the station is the system master station and a request for the system-level master station control authority of the station is received.

In addition, the effective waiting time for the system-level master station to switch the control authority can be 60 seconds. If the original system master station has not released the control authority or the original system slave station has not received the information of the control status of the system-level slave station of the opposite station 1 and the opposite station 2 for more than 60 seconds, the application for the system-level master station control authority switchover is invalid . Of course, in this embodiment, the above-mentioned effective waiting time may not be limited to 60 seconds, and it can be set by itself according to actual needs.

Case 2: All three stations are in the station-level control state, the converter station that first issued the system-level master station control authority request is switched to the system-level master station control state, and the other two converter stations are switched from the station-level control state to the system Layer slave control status.

Specifically, when a high-voltage DC converter station is in the station-level control state and needs to be switched to the system-level control state, the operator control system of the site issues a system-level master station control authority request, and passes the request through the inter-station The communication is passed to the DC station control system of the other two HVDC converter stations. The operator control systems of the other two HVDC converter stations have the authority to issue station-level control authority release commands. After their corresponding DC station control systems receive the station-level control authority release commands, their control status will be controlled by the station level. The state is switched to the control state of the system-level slave station, and the information of the control state of the system-level slave station is sent to the local station. After receiving the system-level slave station control status information sent by other HVDC converter stations at each end, this station switches the station-level control status of the local HVDC converter station to the system-level master station control state.

Among them, similarly, when issuing the control authority request of the system-level master station, it is also necessary to determine whether the permission condition of the control authority switching request is satisfied. At this time, the permission condition of the control authority switching request is the station-level control state of the station, and the station is in the station-level control state. The inter-station communication status of an other station is normal, and there is no request for the control authority of this station or the system-level master station of the station. The permission condition of the station-level control authority release command is that the station is in the station-level control state, and the system-level master station control authority request for the station is received.

Case 3: According to the switching logic of the three-station station-level and system-level control authority, as shown in Figure 5, both the system master station and the system slave station have the authority to issue station-level control authority requests. When the operator control system of a HVDC converter station issues a station-level control authority request, it transmits the request to the DC station control systems of the other two HVDC converter stations. The operator control systems of the other two HVDC converter stations have the authority to issue system-level control authority release commands. After their corresponding DC station control systems receive the system-level control authority release commands, their control status is controlled by the system level. The status (system-level slave station control status or system-level master station control status) is switched to the station-level control status, and the information of the station-level control status is sent to the DC station control system of the station. After receiving the information of the station-level control status of the other two stations, this station switches the control authority status to the station-level control status.

Among them, when issuing a station-level control authority request, it is also necessary to determine whether the permission condition of the control authority switching request is met. At this time, the permission condition of the control authority switching request is the master station or slave station at the system level, and this station is at least one of the other The station-to-station communication is normal, and there is no system-level master station or station-level control authority request command for this station or the opposite station. The permission condition of the system-level control authority release command is that the station is the system master or slave station, and the station-level control authority request for the station is received.

In addition, the effective waiting time for switching from the system-level control state to the station-level control state is 60 seconds. If more than 60 seconds, the other two converter stations have not released the system-level control authority, or the converter station that originally requested to switch to station-level control does not receive the station-level control status information of the opposite station 1 and the opposite station 2, then the station The application for level control authority is invalid.

It should be noted that the above-mentioned parallel multi-terminal high-voltage direct current converter station control authority switching system is illustrated by taking a three-terminal high-voltage direct current converter station as an example. As other implementations, it can also be a four-terminal, five-terminal and other multi-terminal high voltage DC converter station.

The parallel multi-terminal HVDC converter station control authority switching system of the embodiment of the application can realize the switching function of the control authority of the three-station station layer and the system layer, the system-level master station and the system-level slave station. Independent control and joint control of substation converter station. Through the dual-ring network communication scheme between the three stations, it is ensured that when the communication between any two stations fails, the switching function of the control authority of the three stations can still be realized, thereby improving the stable operation of the direct transmission system. The embodiments of the present application are not only applicable to practical engineering applications of parallel three-terminal HVDC power transmission systems and hybrid three-terminal HVDC power transmission systems, but also have guiding significance for the switching of control authority of multi-terminal HVDC power transmission.

The embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method described in the embodiment of the present application are implemented.

The methods disclosed in the several method embodiments provided in this application can be combined arbitrarily without conflict to obtain new method embodiments.

The features disclosed in the several product embodiments provided in this application can be combined arbitrarily without conflict to obtain new product embodiments.

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

The units described above as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units; Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, the functional units in the embodiments of the present application can be all integrated into one processing unit, or each unit can be individually used as a unit, or two or more units can be integrated into one unit; The unit can be implemented in the form of hardware, or in the form of hardware plus software functional units.

A person of ordinary skill in the art can understand that all or part of the steps in the above method embodiments can be implemented by a program instructing relevant hardware. The foregoing program can be stored in a computer readable storage medium. When the program is executed, it is executed. Including the steps of the foregoing method embodiment; and the foregoing storage medium includes: removable storage devices, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks, etc. A medium that can store program codes.

Alternatively, if the above-mentioned integrated unit of the present application is implemented in the form of a software function module and sold or used as an independent product, it may also be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application can be embodied in the form of a software product in essence or a part that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for A computer device (which may be a personal computer, a server, or a network device, etc.) executes all or part of the methods described in the various embodiments of the present application. The aforementioned storage media include: removable storage devices, ROM, RAM, magnetic disks, or optical disks and other media that can store program codes.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A parallel multi-terminal high-voltage direct current converter station control authority switching system, the system includes parallel N-terminal high-voltage direct current converter stations, N≥3, each end of the high-voltage direct current converter station is connected through a ring network communication, each end of the high-voltage direct current converter The flow station is configured to: when it is necessary to switch the control authority, it is judged whether the permission condition of the control authority switch request is satisfied, and the permission condition of the control authority switch request at least includes: the local HVDC converter station and at least the other HVDC converter station at least one end The communication status is normal; if the permission conditions of the control authority switching request are met, the local HVDC converter station communicates with other specific HVDC converter stations at each end to realize the control authority switching. A converter station refers to a HVDC converter station with normal communication status with the local HVDC converter station.
The parallel multi-terminal HVDC converter station control authority switching system according to claim 1, wherein the control authority switching request permission condition further includes: not receiving system-level master station control sent by other HVDC converter stations at each end Permission request or station-level control permission request.
The control authority switching system for parallel multi-terminal HVDC converter stations according to claim 1 or 2, wherein each HVDC converter station is further configured to: detect the communication status with other HVDC converter stations in real time , When it is detected for the first time that the communication status between the local HVDC converter station and either end of the HVDC converter station is abnormal, and the local HVDC converter station is not in the station-level control state, the current control state will be switched It is the control status of the station floor.
The parallel multi-terminal HVDC converter station control authority switching system according to claim 3, wherein each end of the HVDC converter station is further configured to: when it is detected that the communication status between each end of the HVDC converter station is equal If it is abnormal, the system-level master station control authority request function of the local HVDC converter station will be blocked.
The control authority switching system for parallel multi-terminal HVDC converter stations according to claim 1 or 2, wherein the mutual communication with other specific HVDC converter stations at each end to realize the control authority switching includes:

When the local HVDC converter station is in the control state of the system level slave station and needs to be switched to the system level master station control state, the local HVDC converter station sends the system level master to the specific HVDC converter stations at other ends. Station control authority request; when other specific HVDC converter stations receive the system-level master station control authority request, if their own control state is not the system-level slave station control state, it will convert its own control state to the system-level slave station Control status; other specific HVDC converter stations at each end send their own control status information to the local HVDC converter station; the local HVDC converter station receives information from other specific HVDC converter stations at each end After the control status information, the current control status is switched to the system level master station control status.
The control authority switching system for parallel multi-terminal HVDC converter stations according to claim 1 or 2, wherein the mutual communication with other specific HVDC converter stations at each end to realize the control authority switching includes:

When the local HVDC converter station is in the station-level control state and needs to be switched to the system-level master station control state, the local HVDC converter station sends the system-level master station control to the specific HVDC converter stations at each end Authorization request; when other specific HVDC converter stations receive the system-level master station control authorization request, if their own control status is not the system-level slave station control status, it will convert its own control status to the system-level slave station control status ; Other specific HVDC converter stations at each end send their own control status information to the local HVDC converter station; the local HVDC converter station receives the control status sent by other specific HVDC converter stations at each end After the information, the current control state is switched to the system-level master station control state.
The parallel multi-terminal high-voltage direct current converter station control authority switching system according to claim 2, wherein the mutual communication with other specific high-voltage direct current converter stations at each end to realize the control authority switching includes:

When the local HVDC converter station is in the control state of the system-level master station or slave station and needs to be switched to the station-level control state, the local HVDC converter station sends the station level to specific HVDC converter stations at other ends. Control authority request; when the specific HVDC converter station at each other end receives the station-level control authority request, if its own control state is not the station-level control state, it will convert its own control state to the station-level control state; other terminals are specific The HVDC converter station sends its own control status information to the local HVDC converter station; the local HVDC converter station receives the control status information sent by other specific HVDC converter stations at each end, and sends the current The control state is switched to the station-level control state.
A parallel multi-terminal high-voltage direct current converter station control authority switching method is applied to the first high-voltage direct current converter station, the system includes parallel N-terminal high-voltage direct current converter stations, N≥3; the first high-voltage direct current converter station is Any end of the N-end HVDC converter station is a HVDC converter station; each end of the HVDC converter station is connected via a ring network communication; the method includes:

When the first HVDC converter station needs to switch the control authority, it is determined whether the permission condition of the control authority switch request is satisfied. The permission condition of the control authority switch request at least includes: the first HVDC converter station and other at least The communication status between the HVDC converter stations at one end is normal;

If the allowable condition of the control authority switching request is met, it communicates with other specific HVDC converter stations at each end to realize the control authority switching, and the specific HVDC converter station refers to the first HVDC converter station. HVDC converter station with normal communication status between stations.
The method for switching control authority of a parallel multi-terminal HVDC converter station according to claim 8, wherein the control authority switching request permission condition further comprises: not receiving system-level master station control sent by other HVDC converter stations at each end Permission request or station-level control permission request.
The method for switching control authority of a parallel multi-terminal HVDC converter station according to claim 8 or 9, wherein the method further comprises: real-time detection of the communication status with other HVDC converter stations at each end, and when it is detected for the first time If the communication state with the HVDC converter station at any other end is abnormal, and the first HVDC converter station is not in the station-level control state, the current control state is switched to the station-level control state.
The method for switching the control authority of a parallel multi-terminal HVDC converter station according to claim 10, wherein the method further comprises: when it is detected that the communication status with other HVDC converter stations at each end is not normal, then The first HVDC converter station blocks the control authority request function of the system-level master station at the local end.
The method for switching control authority of a parallel multi-terminal HVDC converter station according to claim 8 or 9, wherein the mutual communication with other specific HVDC converter stations at each end to realize the switching of control authority includes:

When the first high-voltage direct current converter station is in the control state of the system-level slave station and needs to be switched to the control state of the system-level master station, sending the system-level master station control authority request to the specific high-voltage direct current converter station at each end;

The first HVDC converter station receives the control state information sent by the specific HVDC converter station at each other end, and switches the current control state to the control state of the system-level master station; wherein, when the other ends After a specific HVDC converter station receives the system-level master station control authority request, if its own control state is not the system-level slave station control state, the other specific HVDC converter stations will convert their own control state to all The system layer slave station controls the status, and sends its own control status information to the first HVDC converter station.
The method for switching control authority of a parallel multi-terminal HVDC converter station according to claim 8 or 9, wherein the mutual communication with other specific HVDC converter stations at each end to realize the switching of control authority includes:

When the first HVDC converter station is in the station-level control state and needs to be switched to the system-level master station control state, send a system-level master station control authority request to specific HVDC converter stations at other ends;

The first HVDC converter station receives the control state information sent by the specific HVDC converter station at each other end, and switches the current control state to the control state of the system-level master station; wherein, when the other ends After the specific HVDC converter station receives the system-level master station control authority request, if its own control state is not the system-level slave station control state, it will convert its own control state to the system-level slave station control state, and send it to the first The HVDC converter station sends its own control status information.
The method for switching control authority of a parallel multi-terminal HVDC converter station according to claim 9, wherein said communicating with other specific HVDC converter stations at each end to realize the switching of control authority comprises:

When the first HVDC converter station is in the control state of the system-level master station or the slave station and needs to be switched to the station-level control state, sending a station-level control authority request to specific HVDC converter stations at other ends;

The first HVDC converter station receives the control state information sent by the specific HVDC converter station at each other end, and switches the current control state to the station-level control state; wherein, when the specific HVDC converter station at each other end After the HVDC converter station receives the station-level control authority request, if its own control state is not the station-level control state, the specific HVDC converter station at each end will convert its own control state to the station-level control state; and The first HVDC converter station sends its own control status information.
A computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the method according to any one of claims 8 to 14 are realized.