CN114033509A - Redundancy control module and method for adjusting door of DEH system of ultra-supercritical unit - Google Patents
Redundancy control module and method for adjusting door of DEH system of ultra-supercritical unit Download PDFInfo
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- CN114033509A CN114033509A CN202111227146.6A CN202111227146A CN114033509A CN 114033509 A CN114033509 A CN 114033509A CN 202111227146 A CN202111227146 A CN 202111227146A CN 114033509 A CN114033509 A CN 114033509A
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- control module
- vc1352d
- card
- servo
- redundancy control
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
Abstract
The invention discloses a door regulation redundancy control module and method for a DEH system of an ultra-supercritical unit, which meet the requirements of a servo card of a DEH control system of a million ultra-supercritical unit on stability, response time and control precision. The gate-adjusting redundant control module comprises a computer, a VC1352D redundant control module, a coil, a turbine control mechanism, a linear differential displacement sensor and an EPDF-SD module. VC1352D the redundant control module detects the LVDT signal. The servo system and a field turbine control mechanism form a servo system for controlling the stroke of the servomotor by controlling voltage/current, so that the servomotor is controlled, the steam inlet quantity of the turbine is changed, and the output power of the turbine is adjusted. The VC1352D redundant control module main and standby card running states can be monitored in real time, effective control of the turbine regulating gate is guaranteed, and undisturbed switching of the servo card is achieved.
Description
Technical Field
The invention belongs to the technical field of electromechanical equipment, and particularly relates to a door regulation redundancy control module and method for a DEH system of an ultra-supercritical unit.
Background
The speed regulation and load control of the steam turbine always depend on the servomotor, and the control of the servomotor is completed through an electro-hydraulic servo valve. A servo clamping piece in a conventional unit corresponds to a valve, a dual-instruction and dual-feedback redundancy mode is adopted on the servo clamping piece to guarantee safety, a door adjusting servo card of a DEH control system of a million ultra-supercritical unit requires redundant configuration of the door adjusting servo card, and the main and standby cards output and drive corresponding servo coils respectively to guarantee output homodromous action and undisturbed switching, so that the safety of the unit is guaranteed.
Chinese utility model patent CN2581696Y discloses a steam turbine electrohydraulic servo control system adopting micro-electronic technology and electromechanical combination, without redundant configuration.
Chinese utility model patent CN201574786U discloses a digital servo system of steam turbine servomotor, which adopts a dual-card redundant control mode to control the steam turbine servomotor. The error caused by manual operation is eliminated, and the digital automatic adjustment of the gasoline engine of the steam turbine set is realized. But the two digital servo cards do not realize mutual monitoring standby.
Chinese utility model patent CN202866906U discloses a digital servo system of steam turbine group, this utility model provides a digital servo system of steam turbine group has designed one kind and has used single chip microprocessor to be the digital servo system of steam turbine group control that contains electric wire netting frequency difference feedback of core to the cooperation carries out the adjustment of parameter, sets up and selects to realize the accurate control to steam turbine group servo valve under the little net work condition with host computer software. However, the system has no redundant servo system, and can not carry out undisturbed switching when an accident occurs.
Chinese utility model patent CN211264095U discloses a redundant servo system with cooperative work function after double-card simultaneous failure. The patent does not mention the control precision, and in order to develop description analysis on the specific conditions and steps of online card replacement, it is unclear whether the requirements of the ultra-supercritical unit on stability, response time and control precision can be met.
In conclusion, if a servo clamping piece fault occurs in a turbine servo control system without redundant configuration, the turbine governor cannot work normally, and the normal operation of a unit is influenced. A servo card of the conventional DEH control system does not indicate whether the system is suitable for a million ultra-supercritical unit or not, and can meet the requirements on stability, response time and control precision. The redundant control module can not monitor the running states of the main and standby servo card of the servo card in real time, and can not switch on line without interference when an accident occurs.
Disclosure of Invention
The invention aims to provide a redundancy control module and method for a throttle of a DEH system of an ultra-supercritical unit, aiming at the defect that a servo card cannot be switched on line without interference when a steam turbine throttle control system in the prior art is in an accident.
The purpose of the invention is realized by the following technical scheme: a gate regulation redundancy control module of a DEH system of an ultra-supercritical unit comprises a computer, a VC1352D redundancy control module, a coil, a steam turbine control mechanism, a linear differential displacement sensor LVDT and an EPDF-SD generator speed measurement module.
VC1352D the redundant control module detects the LVDT signal. There are three paths of current output signals of 50MA for controlling servo system valves. A set of VC1352D control modules is matched with a set of EPDF-SD generator speed measurement modules for use in the construction of a pure electric regulation type DEH redundant servo system of a steam turbine. The servo system and a field turbine control mechanism form a servo system for controlling the stroke of the servomotor by controlling voltage/current, so that the servomotor is controlled, the steam inlet quantity of the turbine is changed, and the output power of the turbine is adjusted.
Furthermore, two VC1352D cards adopt a master-slave card mode and a BTM-VC1352D base form a set of VC1352D redundant control module, each VC1352D has three paths of two-wire 4-20mA current input channels for detecting LVDT signals, and has three paths of +/-50 MA current output signals for controlling servo system valves.
Furthermore, the steam turbine control mechanism is composed of a servo valve, a servomotor slide valve, a servomotor piston, servomotor stroke feedback and the like.
A redundancy control method for a throttle of a DEH system of an ultra-supercritical unit comprises the following steps:
step one, the VC1352D redundancy control module is powered on: and connecting the servo clamping piece with the system.
Step two, VC1352D redundancy control module master-slave card data communication: and data synchronization of the master card and the slave card of the redundancy control module is ensured.
Step three, the VC1352D redundancy control module controls current output: collecting valve instructions and feedback to perform PID operation and output control signals.
Step four, VC1352D redundancy control module is switched abnormally: and after the main card breaks down, the auxiliary card cuts the main card to ensure the undisturbed operation of the system.
The invention has the beneficial effects that:
(1) the invention develops a set of turbine control redundant servo cards VC1352D, which meets the requirements of servo cards of a DEH control system of a million ultra-supercritical unit on stability, response time and control precision;
(2) the invention adopts a double-card redundancy control mode to ensure the effective control of the steam turbine regulating valve;
(3) the invention monitors the running states of the main and standby servo card in real time and realizes the undisturbed switching of the servo card.
Drawings
FIG. 1 is a flow chart of the redundancy control of the throttle of the DEH system of the ultra-supercritical unit;
FIG. 2 is a schematic diagram of the operation of the VC1352D redundant control module of the present invention;
wherein: 1-a computer; 2-VC1352D redundant control modules; 3-a coil; 4-a steam turbine control mechanism; 5-a linear differential displacement sensor; 6-EPDF-SD module.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in figure 1, the gate regulation redundancy control module of the DEH system of the ultra-supercritical unit mainly comprises a computer 1, a VC1352D redundancy control module 2, a coil 3, a turbine control mechanism 4, a linear differential displacement sensor (LVDT)5 and an EPDF-SD (electric generator speed measurement) module 6. The steam turbine control mechanism consists of a servo valve, a servomotor slide valve, a servomotor piston, servomotor stroke feedback and the like. The steam turbine control mechanism 4 is composed of a servo valve, a servomotor slide valve, a servomotor piston, servomotor stroke feedback and the like.
Two VC1352D servo cards and a BTM-VC1352D base form a set of VC1352D redundant control modules. The two VC-1352D servo cards self-check respective running states (including whether AO output is correct, whether AO is disconnected and the like) in the running process, and acquire the running state of the other side through a serial port; by contrast, VC-1352D, which has a good operation status, becomes a master card and controls a servo system. The VC1352D redundant control module is an intelligent redundant servo power amplifier module specially designed for a DEH system, and a main card of the VC1352D redundant control module receives a position feedback signal 4-20mA current from a linear differential displacement transducer (LVDT) and converts the displacement signal into a digital signal. The VC1352D redundant control module main card controller compares the control signal with the position feedback signal, controls the power amplifier output after PI (differential integral) operation, sends the output signal to the AO of the main card and the AO of the auxiliary card, and controls the turbine control mechanism through the control coil. Each VC1352D servo card is provided with three PID control loops, and the two ports work redundantly corresponding to the channels.
VC1352D redundant control modules work simultaneously with one in a master state and one in a standby state. And the double cards collect and operate independently. But the output slave card follows the master card (data is synchronized through an internal serial port), and meanwhile, the slave card PID operation realizes following. The master-slave switching is dependent on the error condition. The VC1352D deck has an error condition as follows: LVDT acquisition error, AO output loop error, HDLC communication error, PID adjust timeout, sample timeout, master to slave link error, slave to master link error, and hardware DI input.
The valve control signal output of the VC1352D redundant control module is-50- +50mA, the detection precision of the current transducer is 0.1% @25 ℃, and the output precision is 1% @25 ℃; the communication protocol is HDLC, the communication speed is 1.5Mbps/750Kbps/375Kbps/187.5Kbp, the communication isolation voltage is 500V, and the interface and system isolation voltage is 1500V; the working voltage is 24VDC +/-5%, the working temperature is 0-60 ℃, the working humidity is 5-90% relative humidity, and the condensation is avoided; the storage temperature is-15 ℃ to 85 ℃, the storage humidity is 5 percent to 95 percent relative humidity, and the condensation is avoided; protection class IP 50.
As shown in FIG. 2, the valve position of the servo valve can be automatically or manually set, a given digital signal is compared with a digital signal obtained by converting 4-20mA current of a position feedback signal through A/D through a comparator, regulation and control are carried out through a PID controller, and the digital signal is converted into an analog signal through a D/A converter to control the servo valve.
The invention discloses a door regulation redundancy control method for a DEH system of an ultra-supercritical unit, which is used for monitoring the running states of a master card and a slave card of a VC1352D redundancy control module in real time and realizing undisturbed switching and comprises the following steps:
step one, the VC1352D redundancy control module is powered on: and connecting the servo clamping piece with the system. The method specifically comprises the following steps:
(1) synchronous power-up: VC1352D redundant control module is electrified synchronously and communicated in handshake mode, the card with small address is set as master, and the card with large address is set as slave.
(2) Single card insertion: and the VC1352D redundant control module card judges the maximum handshake times and continuously judges the value of the master-slave identification IO to be 1. The card is set as the master.
(3) The main card is already working, and another card is inserted: the newly-inserted card piece sends a handshake signal, and the master card can reply an identification frame to mark that the master card is in the master state, so that the new card is automatically set as the slave.
Step two, VC1352D redundancy control module master-slave card data communication: and data synchronization of the master card and the slave card of the redundancy control module is ensured. The method specifically comprises the following steps:
(1) VC1352D redundant control module master card:
and the master card finishes AD acquisition every time, calculates PID and then sends the PID to the slave card for data synchronization, and if the master card does not send the PID for more than 8ms, the master card actively sends a data synchronization frame.
(2) VC1352D redundant control module slave card:
the slave card passively receives data synchronization of the master card, returns a heartbeat every time the data synchronization is received, and actively sends a heartbeat signal if the slave card does not receive the data synchronization for more than 10 ms.
(3) The master card does not receive the heartbeat of the slave card for 20ms and is considered to be offline.
(4) The slave card does not receive the data synchronization or heartbeat signal of the master card for 20ms, and the master card is considered to be offline.
Step three, the VC1352D redundancy control module controls current output: collecting valve instructions and feedback to perform PID operation and output control signals. The method specifically comprises the following steps:
the master card carries out PID operation and outputs a control signal according to the collected valve instruction and feedback, and the slave card directly outputs the data of the master card after receiving the data of the master card and synchronizes a PID algorithm. If the slave card does not receive the master card synchronization data for more than 20ms, the AO outputs 0mA, and the slave card does not have a safe state.
Regardless of master or slave, the counterpart card is taken offline once detected. The HDLC snooping function is turned on. So as to correctly grasp the state of the counterpart card. Monitoring the state of the opposite card through HDLC, and changing the card into the master card according to the following abnormal priority: AO is correct, HDLC communication is correct, AD sampling is overtime, LVDT is wrong, PID adjusts overtime. If the double cards are normal (or the abnormal numbers are consistent), the original master is still the master (if the double-master state is adopted, the address is smaller).
Step four, VC1352D redundancy control module is switched abnormally: and after the main card breaks down, the auxiliary card cuts the main card to ensure the undisturbed operation of the system. The method specifically comprises the following steps:
(1) the master card cuts the slave card:
VC1352D redundant control module meets the following three conditions:
if the sending error state of the main card is one of the error states 1 to 5 of the VC1352D card in the embodiment (fig. 1).
Slave card in line
No abnormality from card
The main card initiates a switching request, if the switching of the main card and the slave card is successful, the main card continues working, if the switching is unsuccessful, the attempted switching is marked, and the mark is used for the main card which is not successful in the next switching to enter a safe state.
(2) Cutting the master card from the slave card:
in the first case: receiving a master-slave switching request of a master card. At this time, the slave card is switched to be the master if all the slave cards are normal.
In the second case: receiving a master-slave switching request of a master card. At this time, the opposite card is AO wrong, and the card AO is correct, and the switching is also carried out.
In the third case: when the main card is detected to be offline, and the master-slave identification IO (hard wire) indicates that the opposite card is not powered on or the slave station mode, the card is also switched to be the master.
Static simulation test was performed on the redundant servo cards. The hardware aspect mainly tests the functions of the VC1352D module comprehensively. The software part mainly tests the bottom layer communication function of the VC1352D module and a system DPU, the operator station/historical station function, the IO database import and export function, the GB/GD function, the engineering management and the configuration function. The test report shows that the undisturbed switching function of the redundant servo clamping piece is normal, the displacement precision is less than or equal to 0.1 percent, and the output precision is less than or equal to 1 percent.
Table 1: VC1352D functional test and performance test main content
In the testing process based on the EDPF NT + software version V2.4B180813, the VC1352D testing prototype has stable performance and complete functions, and all indexes meet the design requirements.
Claims (4)
1. A gate regulation redundancy control module of a DEH system of an ultra-supercritical unit is characterized by comprising a computer, a VC1352D redundancy control module, a coil, a steam turbine control mechanism, a linear differential displacement sensor LVDT and an EPDF-SD generator speed measurement module.
VC1352D the redundant control module detects the LVDT signal. There are three paths of current output signals of 50MA for controlling servo system valves. A set of VC1352D control modules is matched with a set of EPDF-SD generator speed measurement modules for use in the construction of a pure electric regulation type DEH redundant servo system of a steam turbine. The servo system and a field turbine control mechanism form a servo system for controlling the stroke of the servomotor by controlling voltage/current, so that the servomotor is controlled, the steam inlet quantity of the turbine is changed, and the output power of the turbine is adjusted.
2. The door regulation redundancy control module of the DEH system of the ultra-supercritical unit as claimed in claim 1, wherein two VC1352D cards adopt a master-slave card mode and a BTM-VC1352D base form a set of VC1352D redundancy control module, each VC1352D has three two-wire 4-20mA current input channels for detecting LVDT signals and three +/-50 MA current output signals for controlling servo system valves.
3. The DEH system valve redundancy control module of the ultra-supercritical unit according to claim 1, wherein the steam turbine control mechanism is composed of a servo valve, a servomotor slide valve, a servomotor piston, servomotor stroke feedback and the like.
4. The control method of the ultra-supercritical unit DEH system gate redundancy control module based on the claim 1 is characterized by comprising the following steps:
step one, the VC1352D redundancy control module is powered on: and connecting the servo clamping piece with the system.
Step two, VC1352D redundancy control module master-slave card data communication: and data synchronization of the master card and the slave card of the redundancy control module is ensured.
Step three, the VC1352D redundancy control module controls current output: collecting valve instructions and feedback to perform PID operation and output control signals.
Step four, VC1352D redundancy control module is switched abnormally: and after the main card breaks down, the auxiliary card cuts the main card to ensure the undisturbed operation of the system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111227146.6A CN114033509A (en) | 2021-10-21 | 2021-10-21 | Redundancy control module and method for adjusting door of DEH system of ultra-supercritical unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111227146.6A CN114033509A (en) | 2021-10-21 | 2021-10-21 | Redundancy control module and method for adjusting door of DEH system of ultra-supercritical unit |
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| CN1828465A (en) * | 2006-03-06 | 2006-09-06 | 中控科技集团有限公司 | Digital electrohydraulic control system |
| CN201574786U (en) * | 2009-12-21 | 2010-09-08 | 上海电气电站设备有限公司 | Servomotor digitalized servo system of steam turbine unit |
| CN103939154A (en) * | 2014-04-15 | 2014-07-23 | 南京国电南自美卓控制***有限公司 | Steam turbine governing valve redundancy control system and control method thereof |
| EP2955372A2 (en) * | 2014-06-11 | 2015-12-16 | Kevin Lee Friesth | Quintuple-effect generation multi-cycle hybrid renewable energy system with integrated energy provisioning, storage facilities and amalgamated control system |
| CN108153144A (en) * | 2017-11-29 | 2018-06-12 | 中核控制***工程有限公司 | A kind of DCS redundant manipulators no-harass switch method |
| CN109236390A (en) * | 2018-10-25 | 2019-01-18 | 上海电气电站设备有限公司 | Coil control structure, method, medium, terminal and steam turbine suitable for torque-motor |
| CN211264095U (en) * | 2019-12-19 | 2020-08-14 | 东方电气自动控制工程有限公司 | Redundant servo system with double-card simultaneous failure and then cooperative work function |
-
2021
- 2021-10-21 CN CN202111227146.6A patent/CN114033509A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828465A (en) * | 2006-03-06 | 2006-09-06 | 中控科技集团有限公司 | Digital electrohydraulic control system |
| CN201574786U (en) * | 2009-12-21 | 2010-09-08 | 上海电气电站设备有限公司 | Servomotor digitalized servo system of steam turbine unit |
| CN103939154A (en) * | 2014-04-15 | 2014-07-23 | 南京国电南自美卓控制***有限公司 | Steam turbine governing valve redundancy control system and control method thereof |
| EP2955372A2 (en) * | 2014-06-11 | 2015-12-16 | Kevin Lee Friesth | Quintuple-effect generation multi-cycle hybrid renewable energy system with integrated energy provisioning, storage facilities and amalgamated control system |
| CN108153144A (en) * | 2017-11-29 | 2018-06-12 | 中核控制***工程有限公司 | A kind of DCS redundant manipulators no-harass switch method |
| CN109236390A (en) * | 2018-10-25 | 2019-01-18 | 上海电气电站设备有限公司 | Coil control structure, method, medium, terminal and steam turbine suitable for torque-motor |
| CN211264095U (en) * | 2019-12-19 | 2020-08-14 | 东方电气自动控制工程有限公司 | Redundant servo system with double-card simultaneous failure and then cooperative work function |
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