CN112054486B - Valve base control protection method - Google Patents

Valve base control protection method Download PDF

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Publication number
CN112054486B
CN112054486B CN202010950384.9A CN202010950384A CN112054486B CN 112054486 B CN112054486 B CN 112054486B CN 202010950384 A CN202010950384 A CN 202010950384A CN 112054486 B CN112054486 B CN 112054486B
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China
Prior art keywords
valve base
control unit
fault
base control
valve
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CN202010950384.9A
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CN112054486A (en
Inventor
谢敏华
路建良
唐茹彬
***
武思捷
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
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Priority to CN202010950384.9A priority Critical patent/CN112054486B/en
Publication of CN112054486A publication Critical patent/CN112054486A/en
Priority to PCT/CN2021/115361 priority patent/WO2022052830A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Safety Devices In Control Systems (AREA)

Abstract

The invention discloses a valve base control protection method, which comprises the following steps: when the valve base control equipment detects that the valve base control equipment has a fault, timing is started to generate fault duration; when the fault duration time exceeds first preset time and a locking instruction issued by an upper-layer control unit is not received, the valve base control equipment generates and outputs a locking converter valve signal; and when the fault duration time exceeds a second preset time which is greater than the first preset time, the valve base control equipment generates and outputs a signal for the converter valve to quit the operation. By implementing the method, under the condition that physical connection among all control units is not additionally increased, when any layer of the valve base control equipment breaks down, the converter valve can be controlled to be stably transited to a locking and shutdown state, and the converter valve is ensured to be in a controlled state in the whole process; and the strategies of redundant system switching, locking all the sub-modules at the same time as much as possible and the like are fully considered, and the voltage pressure born by the sub-modules of the converter valve during the failure is reduced.

Description

Valve base control protection method
Technical Field
The invention relates to the technical field of flexible direct current transmission, in particular to a valve base control protection method.
Background
Flexible direct current transmission based on a Modular Multilevel Converter (MMC) is known as a third generation transmission technology after alternating current transmission and conventional direct current transmission, and has wide application prospects in the fields of renewable energy power generation grid connection, large-scale city/important load power supply, power grid interconnection, island/drilling platform power supply and the like.
The core equipment of the flexible direct current transmission project mainly comprises a converter VALVE (VALVE), VALVE base Control equipment (VBC), a Pole Control Protection system (POLE Control and Protection, PCP) and the like. The converter valve plays a role in DC-AC conversion and AC-DC conversion in flexible DC transmission engineering, and is formed by connecting hundreds or even thousands of sub-modules in series, wherein each sub-module must be controlled, protected and monitored independently. The valve base control device is a middle pivot for connecting the pole control protection system and the converter valve and bears the operation control and safety protection of the whole converter valve.
Under normal conditions, the control cycle of the valve base control equipment is synchronous with the upper-level equipment (pole control protection equipment), the control cycle of the lower-level equipment in the valve base control equipment is synchronous with the upper-level valve base control equipment, and a control instruction is issued to all the sub-modules in each control cycle to control the on-off of the sub-module IGBT. When the valve base control equipment fails or communication faults of the received superior control instructions occur, the latest control instructions of the superior equipment cannot be transmitted to the sub-modules, the sub-modules are not controlled properly, faults such as overcurrent and overvoltage are easily caused, the sub-modules are damaged, and a large number of sub-modules are subjected to IGBT avalanche breakdown in severe cases.
For the above problems, there are mainly 2 current coping strategies: firstly, valve base control equipment is designed into two systems with dual redundancy, and one system is switched to the other system after failure, so that the operation reliability is improved; and secondly, an independent optical fiber channel is introduced between the highest layer and the lowest layer of the valve base control equipment to offset the risk of the middle layer during fault. However, when the scheme of redundancy design is adopted, if the PCP on-duty system fails to be switched to the standby system for continuous operation due to a failure such as a crash, the VBC will continuously execute the reference wave issued by the failed PCP system, which will quickly cause the converter valve to be over-voltage or the bridge arm to be over-current; when the optical fiber scheme is adopted, if the independent optical fiber channel fails, the control unit at the lowest layer of the VBC still cannot receive the control instruction, and the sub-module controlled by the control unit cannot normally exit from the operation, so that the sub-module is bypassed in a large area.
Disclosure of Invention
In view of this, the embodiment of the invention provides a valve base control protection method to solve the problems that in the prior art, when a valve base control device fails, sub-modules are damaged, and when the valve base control device fails, a large number of sub-modules are subjected to avalanche breakdown.
The technical scheme provided by the invention is as follows:
the embodiment of the invention provides a valve base control protection method, which comprises the following steps: when detecting that the valve base control equipment has a fault, the valve base control equipment starts timing to generate fault duration; when the fault duration time exceeds first preset time and a locking instruction issued by an upper-layer control unit is not received, the valve base control equipment generates and outputs a locking converter valve signal; and when the fault duration time exceeds a second preset time, wherein the second preset time is greater than the first preset time, the valve base control equipment generates and outputs a signal for the converter valve to exit the operation.
Further, the valve base control apparatus includes: at least one layer of control units.
Further, the malfunction of the valve base control apparatus includes: the body is failed and/or the lower layer control unit uploads the failure.
Further, the body failure comprises: any one or more of a downlink communication fault of the upper control unit, an abnormal heartbeat signal of the upper control unit, a fault of all power supplies of the upper control unit or an uplink communication fault of the lower control unit.
Further, when the valve base control device detects that the fault of the valve base control device is a downlink communication fault of the upper-layer control unit, a control time sequence starting signal required by the lower-layer control unit is generated according to the time sequence of the last normal communication before the fault.
Further, the converter valve quitting operation signal is used for informing the converter valve submodule that the switching instruction issued by the valve base control device is not executed any more, and shielding the bypass function of the execution submodule when the valve base control device has a downlink communication fault.
Further, when control units of different layers in the valve base control equipment have faults, the numerical values of the first preset time and the second preset time are different.
Further, the valve base control protection method further comprises the following steps: and when the valve base control equipment detects that the fault of the valve base control equipment is recovered, the valve base control equipment generates an unlocking instruction and an enabling signal along with a latest command issued by an upper-layer control unit and outputs the unlocking instruction and the enabling signal.
The technical scheme provided by the invention has the following effects:
according to the valve base control protection method provided by the embodiment of the invention, under the condition that physical connection among all control units is not additionally increased, when any layer of valve base control equipment breaks down, the converter valve can be controlled to be stably transited to a locking and shutdown state, the converter valve is ensured to be in a controlled state in the whole process, and the operation reliability of the converter valve is further effectively improved; and strategies of redundant system switching, locking of all sub-modules at the same time as much as possible and the like are fully considered, the operation reliability of the on-site converter valve is effectively improved, and the voltage pressure born by the sub-modules of the converter valve during failure is reduced. Meanwhile, according to different fault occurrence positions, the time for protecting the outlets of the control units of the valve base control equipment is different, so that the protection action can be effectively matched with other system-level protection outlets.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a valve base control protection method according to an embodiment of the present invention;
FIG. 2 is a block diagram of the structure of the units of a valve base control protection method according to an embodiment of the present invention;
fig. 3 is a block diagram of the unit structures of a valve base control protection method according to another embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As described in the background art, in the existing flexible direct current transmission project, the valve base control device is an intermediate junction connecting the pole control protection system and the converter valve, and is responsible for operation control and safety protection of the whole converter valve. In order to prevent the converter valve sub-module from being damaged due to the failure of the valve base control equipment, a redundant system or a mode of arranging an independent optical fiber channel is adopted in the prior art, however, the two modes can not avoid the situation that the converter valve sub-module is in an uncontrolled state due to the damage caused by the failure of the valve base control equipment.
In view of this, an embodiment of the present invention provides a valve base control protection method, as shown in fig. 1, the valve base control protection method includes the following steps:
step S101: and when the valve base control equipment detects that the valve base control equipment has faults, timing is started, and fault duration is generated. The valve base control device comprises at least one layer of control unit; when two layers of control units are provided, the control units can be the uppermost layer control unit and the lowermost layer control unit; when three layers of control units are provided, the control units may be the uppermost layer control unit, the middle layer control unit, and the lowermost layer control unit. When the valve base control equipment detects that any layer of control unit has a fault, timing is started simultaneously, and fault duration is generated.
Step S102: when the fault duration time exceeds first preset time and a locking instruction issued by an upper-layer control unit is not received, the valve base control equipment generates and outputs a locking converter valve signal; specifically, when any layer of the valve base control equipment does not receive a locking instruction issued by an upper layer control unit such as an upper control protection system, an uppermost layer control unit or a middle layer control unit within a first preset time, the control unit of the layer with the fault generates and outputs a locking converter valve signal, and finally reaches the converter valve submodule, so that locking of the converter valve submodule is realized.
Step S103: and when the fault duration time exceeds second preset time which is greater than the first preset time, the valve base control equipment generates a converter valve operation quitting signal and sends the converter valve operation quitting signal to the lower-layer control unit. Specifically, when the fault duration of any layer of the valve base control equipment exceeds a second preset time, the control unit of the layer with the fault automatically generates a converter valve operation quitting signal and outputs the signal, and finally the signal reaches the converter valve submodule, so that the converter valve submodule is shut down.
According to the valve base control protection method provided by the embodiment of the invention, under the condition that the physical connection among the control units is not additionally increased, when any layer of the valve base control equipment breaks down, the converter valve can be controlled to be stably transited to the locking and stopping states, and the converter valve is ensured to be in the controlled state in the whole process; and strategies of redundant system switching, locking of all sub-modules at the same time as much as possible and the like are fully considered, the operation reliability of the on-site converter valve is effectively improved, and the voltage pressure born by the sub-modules of the converter valve during failure is reduced.
In one embodiment, the failure of the valve base control apparatus comprises: the body fault and/or the lower control unit upload fault. Wherein, the body trouble includes: any one or more of a downlink communication fault of the upper control unit, an abnormal heartbeat signal of the upper control unit, a fault of all power supplies of the upper control unit or an uplink communication fault of the lower control unit. The lower layer control unit uploading fault means that the lower layer control unit monitors that the fault type in the body fault is uploaded to the lower layer control unit, or that a certain layer control unit receives the fault uploaded by the lower layer control unit.
Specifically, the body fault may be a fault occurring in any layer of control unit in the valve base control device, for example, a downlink communication fault of an upper layer control unit, that is, the layer of control unit that has the fault cannot receive a signal issued by the upper layer control unit; all the control units in the layer have power supply faults, namely the power supply fault of the chassis of the control unit in the layer with the fault; and the lower layer control unit has uplink communication failure, namely the failed layer control unit cannot receive the uploading signal of the lower layer control unit.
In one embodiment, when the valve base control device detects that the fault of the valve base control device is a downlink communication fault of the upper layer control unit, the control timing sequence starting signal required by the lower layer control unit is generated according to the timing sequence of the last normal communication before the fault. Specifically, when a failure of the valve base control device is that a certain layer of control unit receives an upper layer communication failure, the layer of control unit generates a control timing sequence starting signal by itself, so that the control period of the control unit is relatively synchronous with that of the upper layer of control unit, and all control timing sequences of the layer of control unit are guided. The distributed protection action command of the layer of control unit is guaranteed to be issued to the lower layer of control unit, and meanwhile fault information of the layer of control unit can be guaranteed to be uploaded to the upper layer of control unit. The upper control unit may be a pole control protection system, an uppermost control unit, or an intermediate control unit.
In an embodiment, the converter valve exit operation signal is used for informing the converter valve submodule that a switching instruction issued by the valve base control device is no longer executed, and shielding the bypass function of the execution submodule when the valve base control device has a downlink communication fault. Specifically, if the valve base control equipment breaks down for a long time, a signal for the converter valve to quit the operation can be sent out, and the large-area bypass of the converter valve submodule is avoided.
In an embodiment, the valve base control device may include multiple layers of control units, and for a first preset time and a second preset time when each layer of control unit fails to be different, that is, the distributed protection action time values of the control units in different layers are different, the design may be specifically performed according to communication delay of sending the failure to an upper layer of control unit after the layer of control unit monitors the failure state, communication delay of sending the failure to the upper layer of control unit when the upper layer of control unit executes the distributed protection action, and communication delay of sending the protection action to other control units in the layer.
In an embodiment, after the valve base control device detects that the failure of the valve base control device is recovered, the valve base control device generates an unlocking instruction and an enabling signal along with a latest command issued by an upper control unit and outputs the unlocking instruction and the enabling signal, and cancels a distributed protection action, so that the converter valve sub-module can work according to the latest command issued by the upper control unit.
The following description will be made of specific protection operations when the valve base control device fails, taking an example in which the valve base control device has a two-layer structure and a three-layer structure.
When the valve base control device is designed to be a 2-layer structure, as shown in fig. 2, the valve base control device is respectively marked as an uppermost layer control unit and a lowermost layer control unit; the control unit pair at the uppermost layer is connected with the pole control protection system, the control unit pair at the lowermost layer is connected with the control unit at the lowermost layer, and the control unit pair at the lowermost layer is connected with the control unit at the uppermost layer and the converter valve. And analyzing the specific fault protection method when faults occur according to the uppermost layer control unit and the lowermost layer control unit respectively.
(1) If the VBC uppermost layer control unit detects the body fault or receives the lowest layer control unit uploading fault.
If the fault type is the communication fault of the receiver control protection system, the control unit at the uppermost layer automatically generates a control time sequence starting signal to realize relative synchronization with the PCP control period and guide the control unit to control the time sequence completely.
If the fault duration exceeds a first preset time, T 1 ＝T M If the PCP does not issue the locking shutdown instruction, the uppermost control unit issues an autonomous locking instruction to each lowermost control unit, and sends a fault to the PCP;
if the fault duration exceeds a second predetermined time, i.e. T 2 ＝T N (T N ＞T M ) And if so, the uppermost control unit autonomously generates a converter valve operation quitting signal and sends the signal to the lowermost control unit.
(2) If the lowest control unit of the VBC detects the body fault.
If the fault type is communication fault of the uppermost control unit of the receiving valve base control equipment, the VBC lowermost control unit automatically generates a control time sequence starting signal, relative synchronization with the control period of the VBC uppermost control unit is achieved, and the control units are guided to control time sequences completely.
If the fault duration exceeds a first preset time, T 3 ＝T M When the current time is + delta T and the locking shutdown instruction sent by the uppermost control unit is not received, the lowermost control unit sends an autonomous locking instruction to the sub-module connected with the lowermost control unit and sends a fault to the uppermost control unit;
if the fault duration exceeds a second predetermined time, i.e. T 4 ＝T N And when the current value is + delta T, the lowest layer control unit autonomously generates a converter valve operation quitting signal and sends the converter valve operation quitting signal to the sub-modules connected with the converter valve operation quitting signal.
(3)T M 、T N And the delta T is designed according to the time that the locking and converter valve shutdown commands of the superior equipment are issued to other valve base control equipment with normal communication in corresponding time.
When the valve base control device is designed into a 3-layer structure, as shown in fig. 3, the valve base control device is respectively marked as an uppermost layer control unit, a middle layer control unit and a lowermost layer control unit; the control unit of the uppermost layer is connected with a pole control protection system (PCP) to the upper part, is connected with the control unit of the middle layer to the lower part, is connected with the control unit of the middle layer to the upper part and is connected with the converter valve to the lower part, and the control unit of the middle layer is a middle pivot. And analyzing the specific fault protection method when the control units at the uppermost layer, the middle layer and the lowermost layer respectively have faults.
(1) If the VBC uppermost layer control unit detects the body fault or receives the lowest layer control unit uploading fault.
If the fault type is receiving PCP communication fault, the VBC uppermost layer control unit generates a control time sequence starting signal by itself, relative synchronization with a PCP control period is achieved, and the control unit is guided to control the time sequence completely.
If the fault duration exceeds a first preset time, T 1 ＝T M If the PCP does not issue the locking and shutdown instruction, the uppermost layer control unit issues an autonomous locking instruction to each middle layer control unit and sends a fault to the PCP;
if the fault duration exceeds a second predetermined time, i.e. T 2 ＝T N (T N ＞T M ) And if so, the uppermost layer control unit autonomously generates a converter valve operation quitting signal and sends the signal to the middle layer control unit.
(2) And if the VBC middle layer control unit detects the body fault or the lowest layer control unit uploading fault.
If the fault type is the communication fault of the VBC uppermost layer control unit, the VBC middle layer control unit automatically generates a control time sequence starting signal, relative synchronization with the control period of the VBC uppermost layer control unit is achieved, and the control unit is guided to control all time sequences.
If the fault duration exceeds a first preset time, T 3 ＝T M When the current time is + delta T and the locking stop instruction sent by the uppermost control unit is not received, the middle layer control unit sends an autonomous locking instruction to each lowermost control unit and sends a fault to the uppermost control unit;
if the fault duration exceeds a second predetermined time, i.e. T 4 ＝T N And when the current time is + delta T, the middle layer control unit autonomously generates a converter valve operation quitting signal and sends the converter valve operation quitting signal to the lowest layer control unit.
(3) If the lowest control unit of the VBC detects the body fault.
If the fault type is the communication fault of the VBC middle layer control unit, the VBC lowest layer control unit automatically generates a control time sequence starting signal, relative synchronization with the control period of the VBC middle layer control unit is achieved, and the control unit is guided to control all time sequences.
If the fault duration exceeds a first preset time, T 5 ＝T M When the command is +2 delta T and the locking shutdown command sent by the middle layer control unit is not received, the lowest layer control unit sends an autonomous locking command to the sub-module connected with the lowest layer control unit and sends the fault to the middle layer control unit;
if the fault duration exceeds a second predetermined time, i.e. T 6 ＝T N And when the current is +2 delta T, the lowest layer control unit autonomously generates a converter valve running quitting signal and sends the converter valve running quitting signal to the sub-modules connected with the converter valve running quitting signal.
(4)T M 、T N And the delta T is designed according to the time that the locking and converter valve shutdown commands of the superior equipment are issued to other valve base control equipment with normal communication in corresponding time.
According to the valve base control protection method provided by the embodiment of the invention, under the condition that the physical connection among the control units of the valve base control equipment is not additionally increased, when the hardware equipment of each control unit of the pole control protection system or the valve base control equipment fails, the VBC can control the converter valve to be in a locked state and a shutdown state in a stable transition mode, the converter valve in the whole process is ensured to be in a controlled state, and the operation reliability of the converter valve is further effectively improved; according to different fault occurrence positions, the time for protecting the outlets of the control units of the valve base control equipment is different, so that the protection action can be effectively matched with other system-level protection outlets.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Although the present invention has been described in detail with respect to the exemplary embodiments and the advantages thereof, those skilled in the art will appreciate that various changes, substitutions and alterations can be made to the embodiments without departing from the spirit and scope of the invention as defined by the appended claims. For other examples, one of ordinary skill in the art will readily appreciate that the order of the process steps may be varied while maintaining the scope of the present invention.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.

Claims (5)

1. A valve base control protection method, comprising:
when detecting that the valve base control equipment has a fault, the valve base control equipment starts timing to generate fault duration; the failure of the valve base control device comprises: the body fault and/or the lower layer control unit upload fault; the body failure comprises: any one or more of a downlink communication fault of the upper control unit, an abnormal heartbeat signal of the upper control unit, a fault of all power supplies of the failed first-layer control unit or an uplink communication fault of the lower control unit;
when the fault duration time exceeds first preset time and a locking instruction issued by an upper-layer control unit is not received, the valve base control equipment generates and outputs a locking converter valve signal;
when the fault duration time exceeds a second preset time, wherein the second preset time is longer than the first preset time, the valve base control equipment generates and outputs a signal for the converter valve to quit the operation;
when the valve base control equipment detects that the fault of the valve base control equipment is a downlink communication fault of an upper-layer control unit, a control time sequence starting signal required by the lower-layer control unit is generated according to a time sequence of the last normal communication before the fault occurs.
2. The valve base control protection method of claim 1, wherein the valve base control apparatus comprises: at least one layer of control units.
3. The valve base control protection method according to claim 1, wherein the converter valve exit operation signal is used for informing a converter valve submodule that a switching instruction issued by the valve base control device is no longer executed, and shielding a bypass function of the converter valve submodule executed when the valve base control device has a downlink communication fault.
4. The valve base control protection method of claim 1,
and when different layers of control units in the valve base control equipment have faults, the numerical values of the first preset time and the second preset time are different.
5. The valve base control protection method of claim 1, further comprising:
and when the valve base control equipment detects that the fault of the valve base control equipment is recovered, the valve base control equipment generates an unlocking instruction and an enabling signal along with a latest command issued by an upper-layer control unit and outputs the unlocking instruction and the enabling signal.
CN202010950384.9A 2020-09-10 2020-09-10 Valve base control protection method Active CN112054486B (en)

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CN202010950384.9A CN112054486B (en) 2020-09-10 2020-09-10 Valve base control protection method
PCT/CN2021/115361 WO2022052830A1 (en) 2020-09-10 2021-08-30 Valve based control and protection method, and device and storage medium

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