A control system of a converter, a pole control device and a valve control device

Abstract

The application provides a control system of a converter, a pole control device and a valve control device, which comprises a pole control device layer, the pole control device layer comprises a pole control device, the pole control device comprises a pole control module, which is used for completing control and adjustment tasks of a direct current power transmission system and average voltage balance control of a converter bridge arm, converter bridge arm circulating current control and oscillation damping control; and a valve control function module is integrated in the pole control module and is used for collecting average voltage of the converter bridge arm and collecting device state information and fault / alarm state information. According to the technical scheme of the application, the device floor space is reduced, and the link delay is greatly reduced.

Description

Technical Field

[0001] This application relates to the field of flexible DC transmission technology for electric systems, and more particularly to a control system, pole control device, and valve control device for a converter device. Background Technology

[0002] Currently, flexible DC transmission systems use voltage source converters, which can independently adjust active and reactive power output, improve the transmission capacity of AC systems, and are easy to construct into multi-terminal DC transmission systems. They have significant competitiveness in application areas such as renewable energy generation and grid connection, power supply for isolated cities, and AC system interconnection.

[0003] Existing valve control and protection equipment configurations completely separate the extreme control system hardware from the converter valve control and protection system. Because the number of optical fibers that can be plugged into a single optical fiber distribution device is limited, a single bridge arm control often requires more than two optical fiber distribution devices, resulting in a typical number of six or more optical fiber distribution panels. Typically, the connection between the optical fiber distribution device and the converter valve is a point-to-point optical fiber connection. Due to the large number of converter valve modules, a dedicated optical fiber distribution device is needed for point-to-point connections, with multiple optical fiber interface boards connected one-to-one with each converter valve module. As the converter valve capacity increases, the number of optical fiber distribution panels often multiplies, for example, to twelve panels. Combined with the converter valve monitoring system and overall converter valve control equipment, this results in a large footprint. In environments with limited space, such as offshore or container environments, this configuration causes space congestion and hinders maintenance. This solution becomes impractical in actual engineering designs. With the development of communication technology, the optical fiber communication rate between the converter valve bridge arm control board and the converter valve sub-module control board is gradually increasing. For example, speeds may increase from the previous 20Mbps to the current gigabit speeds or even 10G to 40Gbps in the future. The number of optical fibers connecting the fiber distribution unit to the converter valve may be drastically reduced to a few, and point-to-point communication may be replaced by mesh communication, in which case the fiber distribution panel may be completely eliminated.

[0004] In some weak power grid environments, excessive delays from the control system to the converter valve control system can cause system oscillations, which in severe cases can lead to the inability to transmit power normally and damage equipment due to high-frequency harmonics from the oscillations. Therefore, it is urgent to improve the hardware design.

[0005] In summary, the inventors have found that the current configuration of the polar control system hardware, which is completely separate from the converter valve control and protection system, presents difficulties in the following two application scenarios: the first is in situations requiring integrated design of control and protection and converter valve control; the second is in power grid systems with very low system link latency requirements, such as weak power grids or complex load environments. With advancements in power electronic devices and control technology, this current configuration method of completely separating the polar control system hardware from the converter valve control and protection system is being changed. Summary of the Invention

[0006] This application provides a control system, pole control device, and valve control device for a converter, which significantly reduces link latency while minimizing the equipment footprint.

[0007] According to one aspect of this application, a control system for a converter is proposed, including a polar control device layer, wherein the polar control device layer includes polar control devices, and the polar control devices include a polar control module for performing control and regulation tasks of the DC transmission system, as well as average voltage balance control of the converter valve arm, circulating current control of the converter arm, and oscillation damping control; and a valve control function module, integrated into the polar control module, for uploading and collecting average voltage of the converter valve arm and collecting equipment status information and fault / alarm status information.

[0008] According to some embodiments, the polar control device further includes an I / O module for implementing valve-controlled tripping function.

[0009] According to some embodiments, the control system further includes a valve control layer, which includes valve control devices connected to the valve control function module via optical fibers for controlling the converter valve bridge arm and distributing optical fiber data.

[0010] According to some embodiments, the valve control device includes a valve control bridge arm control module and an optical fiber distribution module; the valve control bridge arm control module and the optical fiber distribution module are connected by optical fiber; the optical fiber distribution module and the converter valve device are connected by optical fiber; the valve control bridge arm control module is used to control the bridge arm; the optical fiber distribution module is used to manage the optical fiber connection of the converter valve device.

[0011] According to some embodiments, the valve-controlled device includes a valve-controlled bridge arm control module and an optical fiber distribution module; the optical fiber distribution module is integrated into the valve-controlled bridge arm control module; the optical fiber distribution module and the converter valve device are connected by optical fiber; the valve-controlled bridge arm control module is used to control the bridge arm; the optical fiber distribution module is used to manage the optical fiber connection of the converter valve device.

[0012] According to some embodiments, the fiber optic distribution module is integrated into the valve-controlled bridge arm control module, including the fiber optic distribution module having the valve-controlled bridge arm control module of the first system plugged into its left side, the valve-controlled bridge arm control module of the second system plugged into its right side, and an optical interface module plugged into its middle; the valve-controlled bridge arm control module of the first system is connected to the valve-controlled function module of the first system of the polar control module via optical fiber; the valve-controlled bridge arm control module of the second system is connected to the valve-controlled function module of the second system of the polar control module via optical fiber; and the optical interface module is connected to the converter valve device via optical fiber.

[0013] According to some embodiments, the polar control device further includes a valve-controlled bridge arm control module; the valve-controlled bridge arm control module is integrated into the polar control module; the valve-controlled bridge arm control module and the converter valve device are connected via optical fiber; the valve-controlled bridge arm control module and the valve control module are connected via an uplink optical fiber; the valve-controlled bridge arm control module is used to control the bridge arm.

[0014] According to some embodiments, the polar control device layer also includes an I / O module for implementing valve-controlled tripping function.

[0015] According to some embodiments, the valve-controlled bridge arm control module and the valve-controlled control module are connected by an uplink optical fiber. The uplink optical fiber is split into two paths, which are then respectively connected to the valve-controlled function module of the first system of the polar control module and the valve-controlled function module of the second system of the polar control module.

[0016] According to some embodiments, the uplink optical fiber includes 6 channels, which are used to transmit uplink module voltage data and module status information of the 6 bridge arms, and to issue module switching commands and fault bypass commands.

[0017] According to one aspect of this application, a polar control device is proposed, including a polar control module for performing control and regulation tasks of a DC transmission system, as well as average voltage balance control of converter valve arm, circulating current control of converter arm, and oscillation damping control; and a valve control function module integrated into the polar control module for uploading and collecting average voltage of converter valve arm and collecting equipment status information and fault / alarm status information.

[0018] According to some embodiments, the polar control device further includes a valve-controlled bridge arm control function module, integrated into the polar control module, for controlling the bridge arm.

[0019] According to some embodiments, the polar control device further includes an I / O module for implementing valve-controlled tripping function.

[0020] According to one aspect of this application, a valve-controlled device includes a valve-controlled bridge arm control module for controlling the bridge arm; and an optical fiber distribution module for managing the optical fiber connections of the converter valve device.

[0021] According to some embodiments, the valve-controlled bridge arm control module and the fiber optic distribution module are connected via optical fibers.

[0022] According to some embodiments, the fiber optic distribution module is integrated into the valve-controlled bridge arm control module.

[0023] According to the embodiments of this application, a converter control system, pole control device, and valve control device are provided. In marine, container, or weak power grid environments, by centrally configuring the pole control and valve control protection devices, the converter control system configuration is optimized, and the system footprint is reduced. By reducing intermediate communication and internal forwarding delays, the delay of the converter valve control system itself can be reduced to within the range of 10-20µs, greatly reducing the overall link delay. This completely solves the problem of poor control system performance caused by excessive overall delay, which in turn leads to system oscillation, and further optimizes the system operating state.

[0024] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings, without exceeding the scope of protection claimed by this application.

[0026] Figure 1 A frame diagram of the pole control device of a converter control system according to an example embodiment of this application is shown.

[0027] Figure 2 A frame diagram of the pole control device of a control system for another converter according to an example embodiment of this application is shown.

[0028] Figure 3 A framework diagram of a control system for a converter according to an example embodiment of this application is shown.

[0029] Figure 4 A framework diagram of a control system for another converter according to an example embodiment of this application is shown.

[0030] Figure 5 This diagram illustrates a control system configuration method for a converter according to an embodiment of this application.

[0031] Figure 6 A schematic diagram of another converter control system configuration method provided according to an embodiment of this application is shown.

[0032] Figure 7 This diagram illustrates a fiber optic distribution device provided according to an embodiment of the present application, in which control boards for connecting bridge arms are integrated together.

[0033] Figure 8 A schematic diagram of another converter control system configuration method provided according to an embodiment of this application is shown. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0036] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, apparatus, or operations may be employed. In these cases, well-known structures, methods, apparatuses, implementations, materials, or operations will not be shown or described in detail.

[0037] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily need to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0038] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0039] The apparatus embodiments of this application can be used to execute the method embodiments of this application. For details not disclosed in the apparatus embodiments of this application, please refer to the method embodiments of this application.

[0040] The technical solutions according to the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0041] Figure 1 This diagram illustrates a pole control device for a converter control system according to an exemplary embodiment of this application. The pole control device for a converter control system according to an exemplary embodiment of this application will now be described in detail with reference to the accompanying drawings.

[0042] See Figure 1 The pole control device 101 of the converter control system includes a pole control module 1011 and a valve control function module 1013. The pole control module 1011 is used to complete the control and regulation tasks of the DC transmission system, as well as the average voltage balance control of the converter valve arm, the circulating current control of the converter arm, and the oscillation damping control. The valve control function module 1013 is integrated into the pole control module 1011 and is used for uploading and collecting the average voltage of the converter valve arm, as well as for collecting equipment status information and fault / alarm status information.

[0043] According to some example embodiments of this application, the polar control device 101 also includes an IO module for implementing valve-controlled tripping function.

[0044] Figure 2 A frame diagram of the pole control device of a control system for another converter according to an example embodiment of this application is shown.

[0045] See Figure 2 The pole control device 101 of the converter control system includes a pole control module 1011, a valve control function module 1013, and a valve control bridge arm control module 1015.

[0046] The pole control module 1011 is used to perform control and regulation tasks of the DC transmission system, including average voltage balance control of the converter valve arm, circulating current control of the converter arm, and oscillation damping control. The valve control module 1013, integrated into the pole control module 1011, is used for uploading and collecting average voltage data from the converter valve arm, as well as aggregating equipment status information and fault / alarm status information. The valve-controlled arm control module 1015, integrated into the pole control module 1011, is used to control the arm.

[0047] According to some example embodiments of this application, the polar control device layer 101 also includes an IO module for implementing valve-controlled tripping function.

[0048] Figure 3 A framework diagram of a control system for a converter according to an example embodiment of this application is shown.

[0049] See Figure 3 The converter's control system includes a pole control device layer and a valve control layer. The pole control device layer includes pole control device 101; the valve control layer includes valve control device 103. Pole control device 101 and... Figure 1 The same applies as shown, and will not be repeated here. Valve control device 103 is connected to valve control function module 1013 in pole control device 101 via optical fiber, and is used to control converter valve bridge arm and distribute optical fiber data.

[0050] The valve control device 103 includes a valve control bridge arm control module 1031 and an optical fiber distribution module 1033. According to some example embodiments of this application, the valve control bridge arm control module 1031 and the valve control function module 1013 in the pole control device layer 101 are connected by optical fiber, the valve control bridge arm control module 1031 and the optical fiber distribution module 1033 are connected by optical fiber, and the optical fiber distribution module 1033 and the converter valve device are connected by optical fiber.

[0051] According to some exemplary embodiments of this application, the valve control device 103 includes a valve control bridge arm control module 1031, an optical fiber distribution module 1033, and an optical interface module. The optical fiber distribution module 1033 is integrated into the valve control bridge arm control module 1031. The left side of the optical fiber distribution module 1033 is connected to the valve control bridge arm control module 1031 of the first system, the right side is connected to the valve control bridge arm control module 1031 of the second system, and the optical interface module is connected in the middle. The valve control bridge arm control module 1031 of the first system is connected to the valve control function module of the first system of the polar control module 101 via optical fiber; the valve control bridge arm control module 1031 of the second system is connected to the valve control function module of the second system of the polar control module 101 via optical fiber. The optical interface module is connected to the converter valve device via optical fiber.

[0052] Figure 4 A framework diagram of a control system for another converter according to an example embodiment of this application is shown.

[0053] See Figure 4 The converter's control system includes a pole control device layer, which in turn includes pole control device 101. The structure of pole control device 101 is similar to... Figure 2 The same applies as shown, so I will not repeat it here.

[0054] By comparison Figure 3 and Figure 4 It can be seen that, Figure 4 The control system shown omits Figure 3In the valve control layer, the valve control bridge arm control module 1015 of the valve control device in the valve control layer is integrated into the pole control device 101. The valve control bridge arm control module 1015 and the valve control module 1013 are connected via an uplink optical fiber. The valve control bridge arm control module 1015 and the converter valve device are connected via optical fiber. According to some embodiments of this application, the valve control bridge arm control module 1015 is integrated into the pole control module 1011.

[0055] According to some example embodiments of this application, by splitting the optical fiber, one upstream optical fiber is converted into two, which are then connected to the valve control function module 1013 of the first system of the polarization module 101 and the valve control function module 1013 of the second system of the polarization module, respectively. The aforementioned upstream optical fiber includes a total of 6 channels, which respectively transmit the upstream module voltage data and module status information of the 6 bridge arms, and issue module switching commands and fault bypass commands.

[0056] According to some example embodiments of this application, a polar control device includes a polar control module and a valve control function module. The polar control module is used to perform control and regulation tasks of the DC transmission system, as well as average voltage balance control of the converter valve arm, circulating current control of the converter arm, and oscillation damping control. The valve control function module, integrated into the polar control module, is used for uploading and collecting average voltage data from the converter valve arm, as well as for collecting equipment status information and fault / alarm status information.

[0057] According to some example embodiments of this application, the aforementioned polar control device further includes a valve-controlled bridge arm control function module, which is integrated into the polar control module and used to control the bridge arm.

[0058] According to some example embodiments of this application, the aforementioned polar control device also includes an IO module for implementing valve-controlled tripping function.

[0059] According to some example embodiments of this application, a valve-controlled device includes a valve-controlled bridge arm control module for controlling the bridge arm, and an optical fiber distribution module for managing the optical fiber connections of the converter valve device.

[0060] According to some example embodiments of this application, the valve control bridge arm control module and the optical fiber distribution module in the aforementioned valve control device are connected by optical fiber.

[0061] According to some example embodiments of this application, the fiber optic distribution module in the aforementioned valve-controlled device is integrated into the valve-controlled bridge arm control module.

[0062] According to the technical solution of this application, by centrally configuring the pole control and valve control protection devices, the configuration of the converter control system is optimized, and the system footprint is reduced. By reducing intermediate communication and internal forwarding delays, the delay of the converter valve control system itself can be reduced to the range of 10-20µs, which greatly reduces the overall link delay and completely solves the problem of poor control system performance caused by excessive overall delay, thus causing system oscillation, and further optimizes the system operating status.

[0063] Figures 5-8 For reference to a specific embodiment of the technical solution of this application, see below. Figures 5-8 The technical solution of this application is illustrated with examples.

[0064] Figure 5 This diagram illustrates a control system configuration method for a converter according to an embodiment of this application.

[0065] See Figure 5 The valve control function is centralized in the polar control device 100. The control functions of the converter valve are implemented in the hardware board of the polar control device, such as the average voltage balance control of the six bridge arm modules of the converter valve, the circulating current control of the converter bridge arm, and the oscillation damping control function.

[0066] The valve control function board in the Extreme Control Device 100 can simultaneously collect and upload the average voltage of the modules of the six bridge arms, as well as gather equipment status information and fault / alarm status information.

[0067] In the extreme control device 100, the valve control function board is connected to the six bridge arm control boards 200 via six optical fibers, and the six bridge arm control boards are then connected to the optical fiber distribution panel 300 respectively.

[0068] In the polar control device 100, the valve-controlled tripping function is implemented through the IO board plugged into the polar control device.

[0069] Figure 6 A schematic diagram of another converter control system configuration method provided according to an embodiment of this application is shown.

[0070] See Figure 6 By merging the fiber optic distribution 2000 into a single device via the plug-in bridge arm control board AB and then connecting it to the polar control device 1000, the bridge arm control board chassis was eliminated.

[0071] Figure 7 This diagram illustrates a fiber optic distribution device provided according to an embodiment of the present application, in which control boards for connecting bridge arms are integrated together.

[0072] See Figure 7In the fiber optic distribution unit 3000, redundant bridge arm control boards A / B are plugged in. This includes a bridge arm control board for system A plugged in on the left, a bridge arm control board for system B plugged in on the right, and an optical interface board plugged in the middle. The optical interface board connects to the converter valve equipment. The bridge arm control boards of systems A / B are respectively connected to the functional boards of the valve control equipment plugged into the pole control equipment A / B systems, thus forming redundancy in the valve control equipment.

[0073] Figure 8 A schematic diagram of another converter control system configuration method provided according to an embodiment of this application is shown.

[0074] 4000-level centralized configuration of polarity and valve control and protection equipment, such as Figure 8 As shown. When the number of fiber optic pairs from the single-arm fiber optic distribution device to the converter valve equipment is less than or equal to 4 pairs, the fiber optic distribution device is omitted, and the fiber optic cables of the converter valve equipment are connected to the polarization control device. For example, if the fiber optic data of the converter valve equipment is shared by polarization control A / B, the uplink fiber optic cables of each arm are split into two paths and then sent to the polarization control A / B system host. The corresponding valve control function boards in the polarization control A / B system host are connected to the uplink fiber optic cables of each arm. There are a total of six uplink fiber optic cables for each arm, which transmit the relevant module voltage values ​​and module status information of the six arms, as well as the module switching commands and fault bypass commands.

[0075] Figure 8 For bridge arm 1 or bridge arm 6, taking only two pairs of fiber optic cables for the converter valve equipment as an example, for instance... Figure 8 Fiber optic 4001 and fiber optic 4002.

[0076] According to the technical solution of this application, by fully integrating the converter valve control into the pole control system, the configuration of the converter control system is optimized, and the system footprint is reduced. By reducing intermediate communication and internal forwarding delays, the overall link delay is significantly reduced, completely solving the problem of poor control system performance caused by excessive overall delay, which in turn leads to system oscillation, and further optimizing the system operating state.

[0077] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. Furthermore, any changes or modifications made by those skilled in the art based on the ideas of this application, and on the specific implementation methods and application scope of this application, are all within the scope of protection of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A control system for a converter, comprising a pole control device layer, wherein the pole control device layer includes pole control devices, characterized in that, The polar control device includes: The polar control module is used to complete the control and regulation tasks of the DC transmission system, as well as the average voltage balance control of the converter valve arm, the circulating current control of the converter arm, and the oscillation damping control. The valve control function module is used to upload and collect the average voltage of the converter valve bridge arm and to collect equipment status information and fault / alarm status information. A valve-controlled bridge arm control module is used to control the bridge arm. The valve-controlled bridge arm control module and the valve-controlled function module are connected by an uplink optical fiber. Fiber optic distribution module, used to manage fiber optic connections for converter valve equipment; The extreme control module, the valve control function module, the valve control bridge arm control module, and the fiber optic distribution module are centrally configured, and the valve control function module, the valve control bridge arm control module, and the fiber optic distribution module are integrated into the extreme control device to reduce the footprint of the control system and reduce intermediate communication and internal forwarding latency. The fiber optic distribution module is integrated into the valve-controlled bridge arm control module, and the fiber optic distribution module is integrated into the valve-controlled bridge arm control module in the following manner: The fiber distribution module is plugged into the valve-controlled bridge arm control module of the first system on the left, the valve-controlled bridge arm control module of the second system on the right, and the optical interface module in the middle. The valve-controlled bridge arm control module of the first system is connected to the valve-controlled function module of the first system of the polar control device via optical fiber. The valve control bridge arm control module of the second system is connected to the valve control function module of the second system of the polar control device via optical fiber; The optical interface module is connected to the converter valve device via optical fiber.

2. The control system according to claim 1, wherein the polar control device further comprises: The IO module is used to implement valve-controlled tripping function.

3. The control system according to claim 1, characterized in that, The valve-controlled bridge arm control module and the valve-controlled function module are connected via an uplink optical fiber, including: The uplink optical fiber is split into two paths by means of light splitting, and then connected to the valve control function module of the first system of the polar control device and the valve control function module of the second system of the polar control device, respectively.

4. The control system according to claim 3, characterized in that: The uplink optical fiber includes six channels, which are used to transmit uplink module voltage data and module status information of the six bridge arms, and to issue module switching commands and fault bypass commands.

5. A polar control device, characterized in that, include: The polar control module is used to complete the control and regulation tasks of the DC transmission system, as well as the average voltage balance control of the converter valve arm, the circulating current control of the converter arm, and the oscillation damping control. The valve control function module is used to upload and collect the average voltage of the converter valve bridge arm and to collect equipment status information and fault / alarm status information. A valve-controlled bridge arm control module is used to control the bridge arm. The valve-controlled bridge arm control module and the valve-controlled function module are connected by an uplink optical fiber. Fiber optic distribution module, used to manage fiber optic connections for converter valve equipment; The pole control module, the valve control function module, the valve control bridge arm control module, and the fiber optic distribution module are centrally configured, and the valve control function module, the valve control bridge arm control module, and the fiber optic distribution module are integrated into the pole control device to reduce the footprint of the converter control system and reduce intermediate communication and internal forwarding delays. The fiber optic distribution module is integrated into the valve-controlled bridge arm control module, and the fiber optic distribution module is integrated into the valve-controlled bridge arm control module in the following manner: The fiber distribution module is plugged into the valve-controlled bridge arm control module of the first system on the left, the valve-controlled bridge arm control module of the second system on the right, and the optical interface module in the middle. The valve-controlled bridge arm control module of the first system is connected to the valve-controlled function module of the first system of the polar control device via optical fiber. The valve control bridge arm control module of the second system is connected to the valve control function module of the second system of the polar control device via optical fiber; The optical interface module is connected to the converter valve device via optical fiber.

6. The polar control device according to claim 5, further comprising: The IO module is used to implement valve-controlled tripping function.

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