CN118199131A - Multi-valve cascade valve control system and method - Google Patents

Multi-valve cascade valve control system and method Download PDF

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Publication number
CN118199131A
CN118199131A CN202410167934.8A CN202410167934A CN118199131A CN 118199131 A CN118199131 A CN 118199131A CN 202410167934 A CN202410167934 A CN 202410167934A CN 118199131 A CN118199131 A CN 118199131A
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China
Prior art keywords
valve
control unit
valve control
information
stage
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CN202410167934.8A
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Inventor
郑皓中
王清涛
燕翚
刘涛
肖逾男
刘伟
李苗苗
答科超
张恒铭
史英
魏宏
武晓梅
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China EPRI Science and Technology Co Ltd
China EPRI Electric Power Engineering Co Ltd
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China EPRI Science and Technology Co Ltd
China EPRI Electric Power Engineering Co Ltd
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Priority to CN202410167934.8A priority Critical patent/CN118199131A/en
Publication of CN118199131A publication Critical patent/CN118199131A/en
Pending legal-status Critical Current

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Abstract

The invention provides a valve control system and a method for multi-valve control cascade connection, comprising the following steps: a plurality of valve control units which are sequentially cascaded; each level of valve control unit is connected with a plurality of converter valve modules, and is used for receiving valve module information uploaded by the converter valve modules and controlling the converter valve modules according to the valve module information and control instructions; the first-stage valve control unit is connected with the control protection system and is used for summarizing and processing valve module information of each-stage valve control unit and valve control unit state information, sending the valve module information and the valve control unit state information to the control protection system and receiving a control instruction issued by the valve control unit; the upper and lower stages of the non-primary valve control unit are connected in a double-redundancy communication manner, and are used for receiving the control instruction forwarded by the upper-stage valve control unit and forwarding the control instruction to the lower-stage valve control unit; receiving valve module information and valve control unit state information sent by a lower-level valve control unit and forwarding the valve module information and the valve control unit state information to an upper-level valve control unit; the invention breaks through the upper limit of the number of the control valve modules on the basis of not changing the hardware architecture of the valve control unit, and realizes the control of a plurality of converter valve modules.

Description

Multi-valve cascade valve control system and method
Technical Field
The invention relates to the technical field of control and protection of power electronic systems, in particular to a multi-valve cascade valve control system and a method.
Background
Along with the application and development of power electronic technology in a power system, power electronic equipment is developed towards a high-voltage modularized cascading direction, and particularly, the power electronic equipment is widely applied to high-voltage high-capacity flexible alternating current/direct current technology, the capacity and voltage level of the equipment are rapidly increased, and the number of valve modules of a converter valve is required to be increased under the high voltage level.
At present, a common valve control unit generates a control instruction for each valve module in the converter valve according to a modulation wave of a control system, and sends the control instruction to the valve module to control the on/off of the valve module so as to control the converter valve.
However, due to the limitation of space configuration and software and hardware performance, the single valve control unit has the maximum limit of the communication quantity of the supported valve modules, and cannot completely communicate with all the valve modules, namely, the number of the valve modules received and processed by the single valve control unit is limited, when the number of the valve modules in the converter valve is increased more, the initial valve control unit may not meet the control of all the valve modules, so that the valve control unit needs to be redeveloped, the capacity is improved, the hardware performance needs to be improved, and the development cost is increased, and the time and the labor are consumed.
Disclosure of Invention
To overcome the above-mentioned shortcomings of the prior art, the present invention proposes a multi-valve cascade valve control system comprising: a plurality of valve control units which are sequentially cascaded;
Each stage of valve control unit in the plurality of valve control units is respectively connected with a plurality of converter valve modules, and is used for receiving valve module information uploaded by the plurality of converter valve modules connected with the valve control unit and controlling the plurality of converter valve modules according to the valve module information and a control instruction of an external control protection system;
The valve control unit of one level in the plurality of valve control units is connected with the control protection system and is used for uniformly processing valve module information and valve control unit state information of each level of valve control unit to determine valve module total information and valve control unit total state information; the valve module total information and the valve control unit state total information are sent to the control protection system, and the control instruction issued by the control protection system is received;
The non-primary valve control units in the plurality of valve control units are in dual-redundancy communication connection with the upper and lower valve control units cascaded with the non-primary valve control units, and are used for receiving the control instruction forwarded by the upper valve control unit and forwarding the control instruction to the lower valve control unit; and receiving valve module information and valve control unit state information sent by a lower-level valve control unit thereof, and forwarding the valve module information and the valve control unit state information to an upper-level valve control unit thereof.
Optionally, the dual redundancy communication connection between the non-primary valve control unit and the cascade upper and lower stage valve control units in the multiple valve control units includes:
And a main communication optical fiber used for main communication and a slave communication optical fiber used for standby communication when the main communication optical fiber is abnormal are connected between the non-primary valve control unit and the upper and lower valve control units cascaded with the non-primary valve control unit.
Optionally, each valve control unit includes: the communication board, the interface board and the core board are communicated through a communication channel of the backboard;
The communication board is connected with an external monitoring system and is used for receiving the monitoring data uploaded by the core board, uploading the monitoring data of the core board and the monitoring data of the communication board to the monitoring system together, and forwarding instruction information sent by the monitoring system to the core board;
The interface board is connected with the plurality of converter valve modules and is used for receiving valve module information uploaded by the plurality of converter valve modules and sending the valve module information to the core board; receiving command information of the core board and forwarding the command information to the plurality of converter valve modules; the command information is determined through valve module information and control instructions;
The core board of the non-primary valve control unit is connected with the core boards of the upper and lower valve control units which are cascaded, and is used for receiving the control instruction sent by the core board of the upper valve control unit and forwarding the control instruction to the core board of the lower valve control unit; receiving valve module information and valve control unit state information sent by a core board of a lower-level valve control unit of the valve control unit, and forwarding the valve module information and the valve control unit state information to the core board of an upper-level valve control unit of the valve control unit;
The core board of the primary valve control unit is connected with the control protection system and is used for uniformly processing valve module information and valve control unit state information of each stage of valve control unit to determine valve module total information and valve control unit total state information; and sending the total information of the valve module and the total state information of the valve control unit to an external control protection system, receiving the control instruction issued by the control protection system, and issuing the control instruction to a core board of a lower-stage valve control unit.
Based on the same inventive concept, the invention provides a multi-valve control cascade valve control method, which comprises the following steps:
Each stage of valve control unit in the multi-valve control cascade system receives valve module information of a converter valve module connected with the valve control unit, and a non-stage valve control unit in the valve control system receives the valve module information and valve control unit state information sent by a lower stage of valve control unit and forwards the valve module information and the valve control unit state information to an upper stage of valve control unit;
The first-stage valve control unit in the valve control system performs unified processing on valve module information and valve control unit state information of each-stage valve control unit to determine valve module total information and valve control unit total state information; the valve module total information and the valve control unit total state information are sent to an external control protection system, and a control instruction issued by the control protection system is received;
The non-primary valve control unit in the valve control system receives the control instruction forwarded by the upper-stage valve control unit and forwards the control instruction to the lower-stage valve control unit; the valve control units of each stage control the converter valve modules connected with the valve control units according to the valve module information and the control instructions; and the upper and lower valve control units in cascade connection transmit information in a double-redundancy communication mode.
Optionally, the information is transmitted between the cascaded upper and lower level valve control units by adopting a dual redundancy communication mode, including:
The non-primary valve control unit receives information sent by the primary valve control unit from the primary communication channel and the secondary communication channel at the same time;
if the main communication channel is normal, the non-primary valve control unit uses the main communication channel to send information to the subordinate valve control unit;
If the master communication channel is abnormal and the slave communication channel is normal, the non-primary valve control unit uses the slave communication channel to send information to the subordinate valve control unit.
Optionally, the method further comprises:
if any valve control unit is abnormal, immediately locking an upper-stage valve control unit and a lower-stage valve control unit of the valve control unit, and stopping sending a command signal to the converter valve module;
meanwhile, an upper-level valve control unit of the valve control unit sends communication fault information to a higher-level valve control unit, and a lower-level valve control unit of the valve control unit sends the communication fault information to a lower-level valve control unit until each level valve control unit receives the communication fault information, so that locking is completed and command signals are stopped from being sent to a converter valve module;
and the primary valve control unit sends the communication fault information to the control protection system to trigger the control protection system to start a protection mechanism.
Optionally, the valve module information includes: the total voltage value of the valve modules, the actual running number of the valve modules and the state information of the valve modules;
The receiving the valve module information and the valve control unit state information sent by the lower-level valve control unit and forwarding the valve module information and the valve control unit state information to the upper-level valve control unit comprises the following steps:
Summing the valve module total voltage value of the valve control unit of the current stage and the valve module total voltage value and value summarized by the valve control unit of the next stage, and determining the valve module total voltage value and value summarized by the valve control unit of the current stage;
Summing the actual running number of the valve modules of the valve control unit of the stage and the actual running number and value of the valve modules summarized by the valve control unit of the lower stage, and determining the actual running number and value of the valve modules summarized by the valve control unit of the stage;
the valve module state information and the valve control unit state information of the valve control unit of the current stage are summarized again, and the valve module state information and the valve control unit state information summarized by the valve control unit of the current stage are obtained;
And forwarding the total voltage value and the value of the valve modules summarized by the valve control unit of the current stage, the actual running number and the value of the valve modules summarized by the valve control unit of the current stage, the valve module state information and the valve control unit state information summarized by the valve control unit of the current stage to the valve control unit of the upper stage.
Optionally, the valve module total information includes: the module voltage average value, the actual running number of the valve modules and the valve module state information corresponding to all the valve control units;
The first-stage valve control unit in the valve control system carries out unified processing on valve module information of each-stage valve control unit to determine valve module total information and valve control unit total state information, and the method comprises the following steps:
The first-stage valve control unit sums the valve module total voltage value of the first-stage valve control unit and the valve module total voltage value and value summarized by the lower-stage valve control unit to determine the valve module total voltage values corresponding to all the valve control units;
the first-stage valve control unit sums the actual running number of the valve modules and the actual running number and value of the valve modules summarized by the lower-stage valve control unit to determine the actual running number of the valve modules corresponding to all the valve control units;
the primary valve control unit determines the module voltage average value corresponding to all the valve control units according to the ratio of the total voltage value of the valve modules to the actual running number of the valve modules;
And the primary valve control unit gathers the valve module state information, the valve control unit state information, the valve module state information and the valve control unit state information gathered by the valve control units at the lower stage of the primary valve control unit, so as to obtain the valve module state information and the valve control unit total state information corresponding to all the valve control units.
Optionally, the controlling the converter valve module connected with the valve module information according to the valve module information and a control instruction of an external control protection system includes:
generating a switching pulse according to a modulation wave in a control command of an external control protection system;
determining a bypass instruction according to the valve module information;
and sending the synchronous signals in the switching pulse, the bypass instruction and the control instruction to the converter valve module connected with the switching pulse and the bypass instruction, and controlling the converter valve module connected with the switching pulse and the bypass instruction.
Optionally, the non-primary valve control unit in the valve control system receives the control instruction forwarded by the primary valve control unit and forwards the control instruction to the secondary valve control unit, and the non-primary valve control unit comprises:
the non-primary valve control unit receives a control instruction issued by an upper-stage valve control unit, and the control instruction comprises: modulated waves, control information, and synchronization signals;
The non-primary valve control unit sends the control information and the synchronous signal to a subordinate valve control unit thereof;
And the non-primary valve control unit forwards adjusts the phase angle corresponding to the preset duration to generate a lower-stage modulation wave, and sends the lower-stage modulation wave to the lower-stage valve control unit.
Compared with the closest prior art, the invention has the following beneficial effects:
The application provides a multi-valve cascade valve control system and a method, comprising the following steps: a plurality of valve control units which are sequentially cascaded; each stage of valve control unit in the plurality of valve control units is respectively connected with a plurality of converter valve modules, and is used for receiving valve module information uploaded by the plurality of converter valve modules connected with the valve control unit and controlling the plurality of converter valve modules according to the valve module information and a control instruction of an external control protection system; the valve control unit of one level in the plurality of valve control units is connected with the control protection system and is used for uniformly processing valve module information and valve control unit state information of each level of valve control unit to determine valve module total information and valve control unit total state information; the valve module total information and the valve control unit state total information are sent to the control protection system, and the control instruction issued by the control protection system is received; the non-primary valve control units in the plurality of valve control units are in dual-redundancy communication connection with the upper and lower valve control units cascaded with the non-primary valve control units, and are used for receiving the control instruction forwarded by the upper valve control unit and forwarding the control instruction to the lower valve control unit; and receiving valve module information and valve control unit state information sent by a lower-level valve control unit thereof, and forwarding the valve module information and the valve control unit state information to an upper-level valve control unit thereof. According to the application, valve module information and valve control unit state information acquired by a plurality of valve control units are uploaded to a first-stage valve control unit step by step, and are processed by the first-stage valve control unit and then uploaded to a control protection system, the control protection system generates a control instruction according to the information received by the control protection system and transmits the control instruction to each-stage valve control unit, and each-stage valve control unit controls a connected converter valve module through the control instruction and the valve module information, namely, the application can acquire the state information of all the converter valve modules through a plurality of valve control cascade valve control systems and transmits corresponding control operation commands to each converter valve module, so that the upper limit of the quantity of the control valve modules is broken through on the basis of not changing the hardware architecture of the valve control unit, and the development cost is saved; the number of the valve control units can be freely configured according to the number requirement of the valve modules, and the valve control units can be configured according to the original single valve control units, so that the convenience and the flexibility of configuration are improved; in the dual-communication redundancy technology, by detecting communication state detection information of the master communication channel and the slave communication channel, when the master communication channel is abnormal, the slave communication channel can be rapidly switched to keep normal communication of the upper and lower level valve control units.
In the valve control system, the control protection system only needs to communicate with the first-stage valve control unit, and does not need to communicate with other lower-stage valve control units, so that the influence of the limitation of the number of hardware communication interfaces of the control protection system and the valve control unit does not exist, the control protection system does not need to be redesigned and developed, and the design cost is saved.
The invention discloses a multi-valve cascade valve control system and a method, which also comprise the steps of sending communication fault information to all valve control units and a control protection system step by step when any valve control unit is abnormal, namely, an upper and lower stage valve control unit detects that two communication channels with the valve control unit of the stage are abnormal, so that locking protection is carried out, and the safety of the whole valve control system is ensured.
When each stage of valve control unit in the valve control system transmits the control command downwards step by step, the phase angle corresponding to the preset time length is adjusted forwards by the modulation wave in the control command, namely the advanced correction is carried out, the influence of transmission delay on the control of the valve module is reduced, and the control accuracy rate is improved.
Drawings
FIG. 1 is a schematic diagram of a multi-valve cascade valve control system according to the present invention;
FIG. 2 is a schematic diagram of a dual redundant communication connection between valve control units;
FIG. 3 is a schematic flow chart of a multi-valve cascade valve control method according to the present invention;
FIG. 4 is a schematic diagram of the transmission and processing of valve module voltage and actual run number;
FIG. 5 is a schematic diagram of the transmission of a modulated wave between valve control units;
FIG. 6 is a schematic diagram illustrating the processing of a primary communication channel exception;
fig. 7 is a schematic diagram of a protection process when the valve control unit is abnormal.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Example 1:
the invention provides a multi-valve cascade valve control system, as shown in figure 1, comprising: a plurality of valve control units which are sequentially cascaded;
Each stage of valve control unit in the plurality of valve control units is respectively connected with a plurality of converter valve modules, and is used for receiving valve module information uploaded by the plurality of converter valve modules connected with the valve control unit and controlling the plurality of converter valve modules according to the valve module information and a control instruction of an external control protection system;
The valve control unit of one level in the plurality of valve control units is connected with the control protection system and is used for uniformly processing valve module information and valve control unit state information of each level of valve control unit to determine valve module total information and valve control unit total state information; the valve module total information and the valve control unit state total information are sent to the control protection system, and the control instruction issued by the control protection system is received;
The non-primary valve control units in the plurality of valve control units are in dual-redundancy communication connection with the upper and lower valve control units cascaded with the non-primary valve control units, and are used for receiving the control instruction forwarded by the upper valve control unit and forwarding the control instruction to the lower valve control unit; and receiving valve module information and valve control unit state information sent by a lower-level valve control unit thereof, and forwarding the valve module information and the valve control unit state information to an upper-level valve control unit thereof.
The valve module information and the valve module state information acquired by the valve control units are uploaded to the control protection system step by step and processed, the control protection system generates a control instruction according to the received information and transmits the control instruction to each valve control unit, and each valve control unit controls the connected converter valve module through the control instruction and the valve module information, so that the upper limit of the number of the control valve modules is broken through on the basis of not changing the hardware architecture of the valve control unit, the control of the valve modules is realized, and development cost is saved; and the number of the valve control units can be freely configured according to the number requirement of the valve modules, and the valve control units can be configured according to the original single valve control units, so that the convenience and the flexibility of configuration are improved.
Specifically, as shown in fig. 1, the plurality of valve control units are sequentially cascaded, namely a plurality of valve control units from a first-stage valve control unit, a second-stage valve control unit to an N-stage valve control unit (1-1, a first-stage valve control unit, 1-2, a second-stage valve control unit, 1-3, an N-stage valve control unit, 1-4, a multi-valve control cascade valve control system, 1-5, a converter valve, 1-6, a converter valve module, 1-7, a control protection system, 1-8 and a monitoring system in fig. 1).
And the primary valve control unit uniformly processes the valve module information and the valve control unit state information of each stage of valve control unit to determine the total valve module information and the total valve control unit state information. Wherein the valve module information includes: valve module total voltage value, valve module actual operation number, and valve module status information (valve module status processing information); the valve control unit state information includes: the state processing information and the communication state information of the valve control unit; the valve module total information includes: the module voltage average value, the actual running number of valve modules and the valve module state information corresponding to all the valve control units; the total state information of the valve control units comprises state processing information and communication state information of all the valve control units.
The control instruction issued by the control protection system comprises: synchronization signals, control information, modulated waves, etc.
The primary valve control unit sends the module voltage average value, the actual running number of valve modules, valve module state information (valve module state unified processing information), valve control unit state information (valve control unit state unified processing information), communication state information and the like of all valve control units to the control protection system, and receives synchronous signals, control information, modulation waves and the like sent by the control protection system to the primary valve control unit;
The first-stage valve control unit transmits the synchronous signals, control information, modulation waves and the like of the control protection system received by the first-stage valve control unit to the next-stage valve control unit, and receives the information (communication state information) of the valve module total voltage value, the actual running number of the valve modules, the valve module state information, the communication state of the next-stage valve control unit and the like received by the next-stage valve control unit;
The non-primary valve control unit transmits the synchronous signals, control information, modulation waves and the like of the control protection system transmitted by the upper-stage valve control unit to the lower-stage valve control unit, and simultaneously receives the total valve module voltage, the actual running number of valve modules, the valve module state information, the communication state information and the like of the lower-stage valve control unit.
As shown in fig. 1, each level of valve control unit of the invention is also connected with an external monitoring system, the monitoring system comprises a monitoring device, a synchronous clock and a motion device, and each level of valve control unit sends telemetry information, remote signaling information, parameter fixed value inquiry information, event information and wave recording data to the monitoring system and receives synchronous clock information, parameter fixed value setting information and a function pressing plate switching instruction issued by the monitoring system;
The monitoring system is connected with the control protection system, the control protection system comprises a main control device and a protection device, and the control protection system sends telemetry information, remote signaling information, parameter fixed value query information, event information and wave recording data to the monitoring system; the monitoring system sends synchronous clock information, parameter fixed value setting information, a function pressing plate switching instruction, a remote control instruction and a remote adjustment instruction to the control protection system.
Specifically, the monitoring system further comprises a man-machine interaction interface, and a worker knows a valve control unit in the valve control system and telemetry information, remote signaling information, parameter fixed value inquiry information, event information and wave recording information sent by the control protection system through the man-machine interaction interface of the monitoring system; the parameters mainly comprise system configuration parameters, control parameters, protection parameters, software version information parameters and the like. The configuration parameters can be set up to the number of valve control units, serial numbers, the number of converter valve modules, carrier frequency and the like of the valve control system; the control parameters can be used for setting control parameters of the converter valve module, such as PI control parameters, voltage equalizing control parameters and the like; the protection parameters of the converter valve module can be set, such as overvoltage fixed value, overcurrent fixed value, bypass number exceeding limit value and the like of the converter valve module.
As shown in fig. 2, the dual redundancy communication connection between a non-primary valve control unit and its cascade upper and lower stage valve control units of the plurality of valve control units includes:
And a main communication optical fiber used for main communication and a slave communication optical fiber used for standby communication when the main communication optical fiber is abnormal are connected between the non-primary valve control unit and the upper and lower valve control units cascaded with the non-primary valve control unit. The N-level valve control unit is not provided with a lower-level valve control unit and is only in double-redundancy communication connection with the upper-level valve control unit; and the primary valve control unit is in dual redundancy communication connection with the secondary valve control unit.
A double-communication redundancy technology of upper and lower-stage valve control units of a valve control system based on multi-valve control cascade connection provides a communication state detection and screening mechanism of a main communication channel (main communication optical fiber) and a slave communication channel (slave communication optical fiber) of the upper and lower-stage valve control units. When the main communication channel is abnormal, the secondary communication channel is rapidly switched to maintain normal communication with the upper and lower level valve control units. When the main communication optical fiber 2-1 is disconnected or the communication of the main communication channel is abnormal, the valve control unit can detect the main communication abnormality and switch the receiving and sending of the information of the slave communication optical fiber 2-2, and the valve control unit keeps normal communication with the upper and lower valve control units, so that the reliability of information transmission is improved.
Each valve control unit includes: the communication board, the interface board and the core board are communicated through a communication channel of the backboard;
The communication board is connected with an external monitoring system and is used for receiving the monitoring data uploaded by the core board, uploading the monitoring data of the core board and the monitoring data of the communication board to the monitoring system together, and forwarding instruction information sent by the monitoring system to the core board.
Specifically, the communication board is connected with the monitoring system through an ethernet network cable, and is used for receiving telemetry information, remote signaling information, parameter fixed values, event information, wave recording data and the like uploaded by the core board of the present-stage valve control unit, sorting and packaging the information uploaded by the core board, the remote signaling information, the parameter fixed values, the event information, the wave recording data and the like in the communication board, sending the information to the monitoring system, receiving synchronous clock information, parameter fixed value setting information and a functional pressing plate switching instruction issued by the monitoring system, and forwarding the corresponding synchronous clock information, parameter fixed value setting information and the functional pressing plate switching instruction to the core board of the present-stage valve control unit;
the back plate is embedded in the inner layer of the valve control cabinet, and a plurality of slots are formed in the back plate for inserting the communication plate, the core plate and the interface plate; a copper conductor is arranged in the back plate, a communication circuit is established among all slots of the back plate, and mutual communication among all boards of the valve control unit is carried out in the communication circuit; i.e. the plurality of valve control units are provided with the function of providing a multi-valve control cascade interface.
The interface board is connected with the plurality of converter valve modules and is used for receiving valve module information uploaded by the plurality of converter valve modules and sending the valve module information to the core board; receiving command information of the core board and forwarding the command information to the plurality of converter valve modules; the command information is determined by valve module information and control instructions.
Specifically, the command information comprises a synchronous signal, a switching pulse and bypass command information; the m receiving and transmitting optical heads of the interface board are connected with the m converter valve modules one by one through communication optical fibers, and are used for receiving valve module voltage, valve module state and bypass position information uploaded by the plurality of converter valve modules, forwarding the plurality of valve module information to the core board of the current-stage valve control unit, receiving synchronous signals, switching pulses and bypass command information sent by the core board of the current-stage valve control unit, and forwarding the synchronous signals, switching pulses and bypass command information sent by the core board of the current-stage valve control unit to the corresponding converter valve module.
The core board of the non-primary valve control unit is connected with the core boards of the upper and lower valve control units which are cascaded, and is used for receiving the control instruction sent by the core board of the upper valve control unit and forwarding the control instruction to the core board of the lower valve control unit; receiving valve module information and valve control unit state information sent by a core board of a lower-level valve control unit of the valve control unit, and forwarding the valve module information and the valve control unit state information to the core board of an upper-level valve control unit of the valve control unit;
The core board can determine commands such as bypass commands and the like according to valve module information and send the commands to the corresponding interface boards, and meanwhile calculates switch pulse signals according to control commands sent by the control protection system, namely synchronous signals, control information, modulation waves and the like and sends the switch pulse signals to the corresponding interface boards of the valve control unit of the stage;
The core board of the primary valve control unit is connected with the control protection system and is used for uniformly processing valve module information and valve control unit state information of each stage of valve control unit to determine valve module total information and valve control unit total state information; and sending the total information of the valve module and the total state information of the valve control unit to an external control protection system, receiving the control instruction issued by the control protection system, and issuing the control instruction to a core board of a lower-stage valve control unit. Specifically, the core board of the primary valve control unit provides four transceiving optical heads, two transceiving optical heads are connected with the control protection system, and the other two transceiving optical heads are connected with the core board of the lower valve control unit.
The information transmission relation among the modules can be obtained from fig. 1, in fig. 1, 1 represents that a valve control unit sends synchronous signals, switching pulses and bypass command information to a converter valve module;
2, valve module information uploaded to a valve control unit by a converter valve module, namely module voltage, module state and bypass information;
3 represents valve module information and valve control unit state information sent by the lower-level valve control unit to the upper-level valve control unit;
4 represents a control instruction (a synchronous signal, control information, a modulation wave) sent by the upper-level valve control unit to the lower-level valve control unit and blocking information when communication fails;
5, the valve module total information and the valve control unit total state information (the state unified processing information and the communication state information of all the valve control units and the valve module voltage average value, the actual running number and the valve module state information of the corresponding converter valve module) sent by the first-stage valve control unit to the control protection system are shown;
6, a control instruction (synchronous signal, control information and modulation wave) sent by a control protection system to a primary valve control unit;
7, telemetry information, remote signaling information, parameter fixed value query information, event information and wave recording data which are sent to a monitoring system by a valve control unit;
8, synchronous clock information, parameter fixed value setting information and functional pressing plate switching instructions sent to the valve control unit by the monitoring system are shown;
9, telemetry information, remote signaling information, parameter fixed value query information, event information and wave recording information which are sent to a monitoring system by a control protection system;
and 10, synchronous clock information, parameter fixed value setting information, a function pressing plate switching instruction, a remote control instruction and a remote adjustment instruction which are sent to a control protection system by a monitoring system.
The control protection system only needs to communicate with the first-stage valve control unit, and does not need to communicate with other lower-stage valve control units, so that the influence of the limitation of the number of hardware communication interfaces of the control protection system and the valve control unit does not exist, redesign and development of the control protection system are not needed, and the design cost is saved.
Example 2
Based on the same inventive concept, the invention also provides a valve control method of the multi-valve control cascade connection, as shown in fig. 3, comprising:
S1, each level of valve control unit in a multi-valve control cascade system receives valve module information of a converter valve module connected with the valve control unit, a non-level valve control unit in the valve control system receives valve module information and valve control unit state information sent by a lower level of valve control unit of the valve control system, and forwards the valve module information and the valve control unit state information to an upper level of valve control unit of the valve control system;
s2, uniformly processing valve module information and valve control unit state information of each level of valve control unit by a first level valve control unit in the valve control system, and determining valve module total information and valve control unit total state information; the valve module total information and the valve control unit total state information are sent to an external control protection system, and a control instruction issued by the control protection system is received;
S3, a non-primary valve control unit in the valve control system receives the control instruction forwarded by an upper-stage valve control unit and forwards the control instruction to a lower-stage valve control unit; the valve control units of each stage control the converter valve modules connected with the valve control units according to the valve module information and the control instructions; and the upper and lower valve control units in cascade connection transmit information in a double-redundancy communication mode.
In step S1, the valve module information includes: the total valve module voltage value, the actual valve module operation number and valve module state information.
The non-primary valve control unit in the valve control system receives the valve module information and the valve control unit state information sent by the lower-stage valve control unit and forwards the valve module information and the valve control unit state information to the upper-stage valve control unit, and the non-primary valve control unit comprises:
Summing the valve module total voltage value of the valve control unit of the current stage and the valve module total voltage value and value summarized by the valve control unit of the next stage, and determining the valve module total voltage value and value summarized by the valve control unit of the current stage;
Summing the actual running number of the valve modules of the valve control unit of the stage and the actual running number and value of the valve modules summarized by the valve control unit of the lower stage, and determining the actual running number and value of the valve modules summarized by the valve control unit of the stage;
the valve module state information and the valve control unit state information of the valve control unit of the current stage are summarized again, and the valve module state information and the valve control unit state information summarized by the valve control unit of the current stage are obtained;
And forwarding the total voltage value and the value of the valve modules summarized by the valve control unit of the current stage, the actual running number and the value of the valve modules summarized by the valve control unit of the current stage, the valve module state information and the valve control unit state information summarized by the valve control unit of the current stage to the valve control unit of the upper stage.
Specifically, as shown in fig. 4, the valve control system in this embodiment includes a plurality of valve control units from a primary valve control unit, a secondary valve control unit to an N-stage valve control unit, and in fig. 4, taking a three-stage valve control unit as an example, U dc1、Udc2、Udc3 represents the total voltage value of the valve modules received by the primary, secondary and three-stage valve control units, respectively; u dc1-1、Udc1-2、Udc1-m represents the voltage values of the first, second and mth converter valve modules received by the first interface board in the valve control unit respectively; u dcn-1、Udcn-2、Udcn-m represents the voltage values of the first, second and mth converter valve modules received by the nth interface board in the valve control unit respectively; the N-level valve control unit counts the total voltage value of the valve modules, the actual running number of the valve modules and the valve module state information according to the received module voltage value and bypass state uploaded by the converter valve modules, and uploads the valve module state information and the valve module state information to the valve control unit of the upper level, and meanwhile uploads the valve control unit state information and the valve module state information of the N-level valve control unit to the valve control unit of the upper level;
The upper-stage valve control unit calculates the total valve module voltage value, the actual running number of valve modules and valve module state information of the current-stage valve control unit according to the received module voltage value and bypass state uploaded by the converter valve module, respectively sums the total valve module voltage value and the actual running number of valve modules uploaded by the lower-stage valve control unit, and uploads the summation result of the total valve module voltage value and the actual running number of valve modules to the valve control unit of the higher stage, and simultaneously uploads the received valve control unit state information and valve module state information, and the valve control unit state information and the valve module state information of the current-stage valve control unit to the valve control unit of the higher stage; up to a stage one valve control unit.
In step S2, the valve module total information includes: the module voltage average value, the actual running number of the valve modules and the valve module state information corresponding to all the valve control units;
The first-stage valve control unit in the valve control system performs unified processing on valve module information and valve control unit state information of each-stage valve control unit to determine valve module total information and valve control unit total state information, and the method comprises the following steps:
The first-level valve control unit sums the valve module total voltage value of the first-level valve control unit and the valve module total voltage value and value summarized by the lower-level valve control unit (second-level valve control unit) to determine the valve module total voltage value corresponding to all the valve control units;
the first-stage valve control unit sums the actual running number of the valve modules and the actual running number and value of the valve modules summarized by the lower-stage valve control unit to determine the actual running number of the valve modules corresponding to all the valve control units;
the primary valve control unit determines the module voltage average value corresponding to all the valve control units according to the ratio of the total voltage value of the valve modules to the actual running number of the valve modules;
And the primary valve control unit gathers the valve module state information of the primary valve control unit and the valve module state information and the valve control unit state information gathered by the subordinate valve control units thereof to obtain the valve module state information and the valve control unit total state information corresponding to all the valve control units.
The calculation formula of the module voltage average value corresponding to all the valve control units is as follows:
Wherein, Representing the module voltage average value corresponding to all the valve control units; sigma U dc1 represents the total voltage value of the valve module received by the first-stage valve control unit; sigma U dc2 represents the total voltage value of the valve module received by the two-stage valve control unit; sigma U dcN represents the total voltage value of the valve module received by the N-level valve control unit; k 1 represents the actual running number of the valve modules received by the first-stage valve control unit; k 2 represents the actual running number of the valve modules received by the secondary valve control unit; k N represents the actual running number of the valve modules received by the N-stage valve control unit.
By adopting the voltage average value calculation method of the valve control system of the multi-valve control cascade connection, the voltage average value of the converter valve module can be calculated through a plurality of valve control units, and the calculation problem of the voltage average value of the whole valve module can be solved.
In step S3, the controlling the converter valve module connected with the valve module information according to the valve module information and a control instruction of an external control protection system includes:
the valve control unit generates a switching pulse according to a modulation wave in a control instruction of an external control protection system;
determining a bypass instruction according to the valve module information;
and sending the synchronous signals in the switching pulse, the bypass instruction and the control instruction to the converter valve module connected with the switching pulse and the bypass instruction, and controlling the converter valve module connected with the switching pulse and the bypass instruction.
The non-primary valve control unit in the valve control system receives the control instruction forwarded by the upper-stage valve control unit and forwards the control instruction to the lower-stage valve control unit, and the non-primary valve control unit comprises:
the non-primary valve control unit receives a control instruction issued by an upper-stage valve control unit, and the control instruction comprises: modulated waves, control information, and synchronization signals;
The non-primary valve control unit sends the control information and the synchronous signal to a subordinate valve control unit thereof;
And the non-primary valve control unit forwards adjusts the phase angle corresponding to the preset duration to generate a lower-stage modulation wave, and sends the lower-stage modulation wave to the lower-stage valve control unit.
Wherein, the specific adjustment of the modulation wave comprises: the embodiment comprises an N-stage valve control unit, wherein the communication delay from an upper-stage valve control unit to a lower-stage valve control unit is delta t, the first-stage valve control unit receives modulation issued by a control protection system and forwards the modulation to the lower-stage valve control unit, and the total delay of the modulation received by the N-stage valve control unit is (N-1) delta t. In the switching pulse synchronization method of the valve control system adopting the multi-valve control cascade connection, an upper-stage valve control unit calculates and generates a switching pulse signal from the received modulation wave, and meanwhile, the modulation wave is sent to a lower-stage valve control unit after being forwardly adjusted by a phase angle corresponding to Δt time, as shown in fig. 5. The operation steps are as follows:
(1) The first-stage valve control unit receives the modulated wave issued by the control protection system;
(2) The first-stage valve control unit generates switching pulses according to the issued modulation waves and sends the switching pulses to each converter valve module connected with the first-stage valve control unit;
(3) The first-stage valve control unit sends the received modulation wave to the second-stage valve control unit after advancing the phase angle corresponding to the delta t time;
(4) The second-stage valve control unit receives the modulated wave issued by the first-stage valve control unit;
(5) The secondary valve control unit generates switching pulses according to the issued modulation waves and sends the switching pulses to each converter valve module connected with the secondary valve control unit;
(6) The second-stage unit sends the received modulation wave to the third-stage valve control unit after advancing the phase angle corresponding to the delta t time;
(7) Similar to the above process, the N-1 level valve control unit receives the modulated wave issued by the N-2 level valve control unit;
(8) The N-1 level valve control unit generates switching pulse according to the modulation wave issued by the N-2 level valve control unit and sends the switching pulse to each converter valve module connected with the N-1 level valve control unit;
(9) The N-1 level unit sends the issued modulation wave to the N level valve control unit after advancing the phase angle corresponding to the delta t time;
(10) The N-level valve control unit receives the modulated wave issued by the N-1 level valve control unit;
(11) The N-level valve control unit generates switching pulse according to the modulation wave issued by the N-1 level valve control unit and sends the switching pulse to each converter valve module connected with the N-level valve control unit.
According to the transmission delay correction method, after the valve control unit receives the modulated wave, the modulated wave is subjected to advanced correction and sent to the lower-stage valve control unit, so that the influence of the transmission delay of each-stage valve control unit on the calculation of the switch pulse when the communication channel transmits the modulated wave can be reduced, namely the influence of the transmission delay on the control of the valve module is reduced, and the control accuracy rate is improved.
As shown in fig. 6, in the multi-valve cascade control system provided by the present invention, a dual redundancy communication mode is adopted between upper and lower valve control units of the cascade control to transmit information, including:
All the valve control units are connected end to end, all the valve control units are communicated through communication optical fibers, and the communication optical fibers for communication between the upper and lower stages comprise a master communication optical fiber and a slave communication optical fiber which are mutually used for standby.
The non-primary valving unit receives information transmitted by its superordinate valving unit from both the primary communication channel (channel 1 in fig. 6) and from the secondary communication channel (channel 2 in fig. 6);
if the main communication channel is normal, the non-primary valve control unit uses the main communication channel to send information to the subordinate valve control unit;
If the main communication channel is abnormal and the slave communication channel is normal, the non-primary valve control unit uses the slave communication channel to send information to the lower-stage valve control unit, namely, the non-primary valve control unit discards the information transmitted by the main communication channel according to the detection result of the master communication channel and the slave communication channel, and screens the information transmitted by the upper-stage valve control unit transmitted by the slave communication channel for use.
The multi-valve cascade valve control system also comprises a protection technology of upper and lower stages of valve control units, when a certain stage of valve control unit is abnormal, such as power failure, chip failure and the like, the valve control unit can judge that the double redundant communication channels are abnormal, and the valve control unit starts the whole valve control unit to protect and lock, and stops sending information such as switch pulse and the like to all valve modules.
As shown in fig. 7, if any one of the valve control units is abnormal, such as power failure, chip failure, etc., the upper level valve control unit and the lower level valve control unit of the valve control unit are immediately blocked, and the transmission of command signals to the converter valve module is stopped;
meanwhile, an upper-level valve control unit of the valve control unit sends communication fault information to a higher-level valve control unit, and a lower-level valve control unit of the valve control unit sends the communication fault information to a lower-level valve control unit until each level valve control unit receives the communication fault information, so that locking is completed and command signals are stopped from being sent to a converter valve module;
and the primary valve control unit sends the communication fault information to the control protection system to trigger the control protection system to start a protection mechanism.
Specifically, (1) the upper-stage valve control unit judges that the master and slave communication channels of the valve control unit of the present stage are simultaneously abnormal (channels 1 and 2 shown in fig. 7), and the lower-stage valve control unit receives the master and slave communication channels of the valve control unit of the present stage and is simultaneously abnormal (channels 3 and 4 shown in fig. 7);
(2) The upper and lower valve control units are immediately blocked (the valve control unit of the current stage is also blocked), and the transmission of information such as switch pulse and the like to the converter valve module is stopped, meanwhile, the upper valve control unit transmits communication fault information to the valve control unit of the higher stage, and the lower valve control unit transmits communication fault information to the valve control unit of the lower stage;
(3) After receiving the communication fault information, other valve control units lock at the same time and stop sending information such as switch pulse to the valve module;
(4) The first-stage valve control unit sends communication fault information to the control protection system, triggers the control protection system to start a protection mechanism, and achieves linkage protection with the control protection system.
According to the protection technology of the upper and lower-stage valve control units, when an abnormality occurs in one valve control unit, the converter valve module can be quickly locked, the protection function is started, and the operation safety of the multi-valve control cascade valve control system can be ensured.
The multi-valve cascade valve control system can break through the maximum limit of the communication quantity of the valve modules supported by the single valve control unit, realize normal communication and control with all the valve modules, and realize flexible configuration of single/multiple valve control unit selection on application. The valve control system of the multi-valve control cascade adopts a double-redundancy communication processing technology among valve control units, an upper-lower-stage valve control unit protection technology (a communication interrupt protection processing technology among valve control units), a valve module voltage average value calculation method and a transmission delay correction method (a switching pulse delay processing technology) to realize the normal operation, control and protection of the valve control system of the multi-valve control cascade.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the foregoing embodiments are merely for illustrating the technical solution of the present invention and not for limiting the scope of protection thereof, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes, modifications or equivalents may be made to the specific embodiments of the application while the invention is read, and such changes, modifications or equivalents are within the scope of protection of the claims appended hereto.

Claims (10)

1. A multiple valve cascade valve control system comprising: a plurality of valve control units which are sequentially cascaded;
Each stage of valve control unit in the plurality of valve control units is respectively connected with a plurality of converter valve modules, and is used for receiving valve module information uploaded by the plurality of converter valve modules connected with the valve control unit and controlling the plurality of converter valve modules according to the valve module information and a control instruction of an external control protection system;
The valve control unit of one level in the plurality of valve control units is connected with the control protection system and is used for uniformly processing valve module information and valve control unit state information of each level of valve control unit to determine valve module total information and valve control unit total state information; the valve module total information and the valve control unit state total information are sent to the control protection system, and the control instruction issued by the control protection system is received;
The non-primary valve control units in the plurality of valve control units are in dual-redundancy communication connection with the upper and lower valve control units cascaded with the non-primary valve control units, and are used for receiving the control instruction forwarded by the upper valve control unit and forwarding the control instruction to the lower valve control unit; and receiving valve module information and valve control unit state information sent by a lower-level valve control unit thereof, and forwarding the valve module information and the valve control unit state information to an upper-level valve control unit thereof.
2. The multiple valve cascade valve control system of claim 1, wherein a dual redundant communication connection between a non-primary valve control unit of said plurality of valve control units and its cascade upper and lower stage valve control units comprises:
And a main communication optical fiber used for main communication and a slave communication optical fiber used for standby communication when the main communication optical fiber is abnormal are connected between the non-primary valve control unit and the upper and lower valve control units cascaded with the non-primary valve control unit.
3. A multi-valve cascade valve control system as recited in claim 1, wherein each valve control unit comprises: the communication board, the interface board and the core board are communicated through a communication channel of the backboard;
The communication board is connected with an external monitoring system and is used for receiving the monitoring data uploaded by the core board, uploading the monitoring data of the core board and the monitoring data of the communication board to the monitoring system together, and forwarding instruction information sent by the monitoring system to the core board;
The interface board is connected with the plurality of converter valve modules and is used for receiving valve module information uploaded by the plurality of converter valve modules and sending the valve module information to the core board; receiving command information of the core board and forwarding the command information to the plurality of converter valve modules; the command information is determined through valve module information and control instructions;
The core board of the non-primary valve control unit is connected with the core boards of the upper and lower valve control units which are cascaded, and is used for receiving the control instruction sent by the core board of the upper valve control unit and forwarding the control instruction to the core board of the lower valve control unit; receiving valve module information and valve control unit state information sent by a core board of a lower-level valve control unit of the valve control unit, and forwarding the valve module information and the valve control unit state information to the core board of an upper-level valve control unit of the valve control unit;
The core board of the primary valve control unit is connected with the control protection system and is used for uniformly processing valve module information and valve control unit state information of each stage of valve control unit to determine valve module total information and valve control unit total state information; and sending the total information of the valve module and the total state information of the valve control unit to an external control protection system, receiving the control instruction issued by the control protection system, and issuing the control instruction to a core board of a lower-stage valve control unit.
4. A method of valving a multi-valve cascade comprising:
Each stage of valve control unit in the multi-valve control cascade system receives valve module information of a converter valve module connected with the valve control unit, and a non-stage valve control unit in the valve control system receives the valve module information and valve control unit state information sent by a lower stage of valve control unit and forwards the valve module information and the valve control unit state information to an upper stage of valve control unit;
The first-stage valve control unit in the valve control system performs unified processing on valve module information and valve control unit state information of each-stage valve control unit to determine valve module total information and valve control unit total state information; the valve module total information and the valve control unit total state information are sent to an external control protection system, and a control instruction issued by the control protection system is received;
The non-primary valve control unit in the valve control system receives the control instruction forwarded by the upper-stage valve control unit and forwards the control instruction to the lower-stage valve control unit; the valve control units of each stage control the converter valve modules connected with the valve control units according to the valve module information and the control instructions; and the upper and lower valve control units in cascade connection transmit information in a double-redundancy communication mode.
5. The method for controlling a multi-valve cascade according to claim 4, wherein the information is transmitted between the upper and lower valve control units of the cascade by using a dual redundancy communication method, comprising:
The non-primary valve control unit receives information sent by the primary valve control unit from the primary communication channel and the secondary communication channel at the same time;
if the main communication channel is normal, the non-primary valve control unit uses the main communication channel to send information to the subordinate valve control unit;
If the master communication channel is abnormal and the slave communication channel is normal, the non-primary valve control unit uses the slave communication channel to send information to the subordinate valve control unit.
6. A method of valving a multi-valve cascade as in claim 4 or claim 5 and further comprising:
if any valve control unit is abnormal, immediately locking an upper-stage valve control unit and a lower-stage valve control unit of the valve control unit, and stopping sending a command signal to the converter valve module;
meanwhile, an upper-level valve control unit of the valve control unit sends communication fault information to a higher-level valve control unit, and a lower-level valve control unit of the valve control unit sends the communication fault information to a lower-level valve control unit until each level valve control unit receives the communication fault information, so that locking is completed and command signals are stopped from being sent to a converter valve module;
and the primary valve control unit sends the communication fault information to the control protection system to trigger the control protection system to start a protection mechanism.
7. A method of valving a multi-valve cascade as defined in claim 4 wherein the valve module information comprises: the total voltage value of the valve modules, the actual running number of the valve modules and the state information of the valve modules;
The receiving the valve module information and the valve control unit state information sent by the lower-level valve control unit and forwarding the valve module information and the valve control unit state information to the upper-level valve control unit comprises the following steps:
Summing the valve module total voltage value of the valve control unit of the current stage and the valve module total voltage value and value summarized by the valve control unit of the next stage, and determining the valve module total voltage value and value summarized by the valve control unit of the current stage;
Summing the actual running number of the valve modules of the valve control unit of the stage and the actual running number and value of the valve modules summarized by the valve control unit of the lower stage, and determining the actual running number and value of the valve modules summarized by the valve control unit of the stage;
the valve module state information and the valve control unit state information of the valve control unit of the current stage are summarized again, and the valve module state information and the valve control unit state information summarized by the valve control unit of the current stage are obtained;
And forwarding the total voltage value and the value of the valve modules summarized by the valve control unit of the current stage, the actual running number and the value of the valve modules summarized by the valve control unit of the current stage, the valve module state information and the valve control unit state information summarized by the valve control unit of the current stage to the valve control unit of the upper stage.
8. A method of valving a multi-valve cascade as defined in claim 7 wherein the valve module aggregate information comprises: the module voltage average value, the actual running number of the valve modules and the valve module state information corresponding to all the valve control units;
The first-stage valve control unit in the valve control system carries out unified processing on valve module information of each-stage valve control unit to determine valve module total information and valve control unit total state information, and the method comprises the following steps:
The first-stage valve control unit sums the valve module total voltage value of the first-stage valve control unit and the valve module total voltage value and value summarized by the lower-stage valve control unit to determine the valve module total voltage values corresponding to all the valve control units;
the first-stage valve control unit sums the actual running number of the valve modules and the actual running number and value of the valve modules summarized by the lower-stage valve control unit to determine the actual running number of the valve modules corresponding to all the valve control units;
the primary valve control unit determines the module voltage average value corresponding to all the valve control units according to the ratio of the total voltage value of the valve modules to the actual running number of the valve modules;
And the primary valve control unit gathers the valve module state information, the valve control unit state information, the valve module state information and the valve control unit state information gathered by the valve control units at the lower stage of the primary valve control unit, so as to obtain the valve module state information and the valve control unit total state information corresponding to all the valve control units.
9. A method of valve control of a multi-valve cascade as set forth in claim 4, wherein said controlling said converter valve module to which it is connected based on said valve module information and control instructions of an external control protection system, comprises:
generating a switching pulse according to a modulation wave in a control command of an external control protection system;
determining a bypass instruction according to the valve module information;
and sending the synchronous signals in the switching pulse, the bypass instruction and the control instruction to the converter valve module connected with the switching pulse and the bypass instruction, and controlling the converter valve module connected with the switching pulse and the bypass instruction.
10. A method of valving a multi-valve cascade as defined in claim 4 wherein a non-primary valving unit in the valving system receives the control command forwarded by its upper-stage valving unit and forwards the control command to its lower-stage valving unit, comprising:
the non-primary valve control unit receives a control instruction issued by an upper-stage valve control unit, and the control instruction comprises: modulated waves, control information, and synchronization signals;
The non-primary valve control unit sends the control information and the synchronous signal to a subordinate valve control unit thereof;
And the non-primary valve control unit forwards adjusts the phase angle corresponding to the preset duration to generate a lower-stage modulation wave, and sends the lower-stage modulation wave to the lower-stage valve control unit.
CN202410167934.8A 2024-02-06 2024-02-06 Multi-valve cascade valve control system and method Pending CN118199131A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410167934.8A CN118199131A (en) 2024-02-06 2024-02-06 Multi-valve cascade valve control system and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410167934.8A CN118199131A (en) 2024-02-06 2024-02-06 Multi-valve cascade valve control system and method

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CN118199131A true CN118199131A (en) 2024-06-14

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