CN215369958U - Redundant servo control system of steam turbine valve - Google Patents
Redundant servo control system of steam turbine valve Download PDFInfo
- Publication number
- CN215369958U CN215369958U CN202120524828.2U CN202120524828U CN215369958U CN 215369958 U CN215369958 U CN 215369958U CN 202120524828 U CN202120524828 U CN 202120524828U CN 215369958 U CN215369958 U CN 215369958U
- Authority
- CN
- China
- Prior art keywords
- servo module
- servo
- feedback loop
- module
- electro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 230000033228 biological regulation Effects 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
Images
Landscapes
- Control Of Turbines (AREA)
Abstract
The embodiment of the utility model provides a control system for redundant servo of a steam turbine valve, which comprises: the system comprises a first servo module, a second servo module, a main controller, a first LVDT feedback loop, a second LVDT feedback loop, an electro-hydraulic converter and an oil motor; the main controller is connected with the first servo module, the backup controller is connected with the second servo module, the first servo module and the second servo module are connected to the electro-hydraulic converter in parallel, and the electro-hydraulic converter is connected with the servomotor; the first LVDT feedback loop is connected with the first servo module, the second LVDT feedback loop is connected with the second servo module, and the first LVDT feedback loop and the second LVDT feedback loop are both connected to the servomotor.
Description
Technical Field
The utility model relates to the technical field of steam turbines, in particular to a control system for redundant servo of a steam turbine governor.
Background
The digital electro-hydraulic control system (DEH) of the unit turbine adopts a Symphony system produced by Beijing ABB belie engineering Limited, and the control module adopts an IMHSS13 hydraulic servo module. The development of the steam turbine control system is experienced by a mechanical hydraulic speed regulation system, a full hydraulic speed regulation system, an analog electro-hydraulic speed regulation system, an electro-hydraulic concurrent speed regulation system and a digital electro-hydraulic speed regulation system DEH which is generally adopted at present. The DEH control system adopts a digital computer as a controller, and the electric signal controls the oil pressure of high-pressure fire-resistant oil through an electro-hydraulic converter to drive the servomotor, so that the high-pressure main throttle valve and the medium-pressure main throttle valve are opened and closed, and the rotating speed and the load of the steam turbine are controlled. Reliable operation of the DEH system is the basis for ensuring stable operation of the unit, a redundant controller is basically adopted for most DEH control systems, and a redundant IO bus ensures reliable operation of the system.
But single-mode control is still used for the servo module controlling the valve. When the servo module has problems, the valve is easily opened or closed by mistake, the stable operation of the unit is affected, and even forced shutdown is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a redundant servo control system for a steam turbine governor valve, and aims to solve the problem that the stable operation of a unit is influenced because the false opening and the false closing of the valve are easily caused when the existing servo module has problems. In order to achieve the purpose, the utility model adopts the following technical scheme:
a control system for redundant servo of a steam turbine governor comprising: the system comprises a first servo module, a second servo module, a main controller, a first LVDT feedback loop, a second LVDT feedback loop, an electro-hydraulic converter and an oil motor;
the first servo module and the second servo module are connected to the main controller, the first servo module and the second servo module are connected to the electro-hydraulic converter in parallel, and the electro-hydraulic converter is connected with the servomotor;
the first LVDT feedback loop is connected with the first servo module, the second LVDT feedback loop is connected with the second servo module, and the first LVDT feedback loop and the second LVDT feedback loop are both connected to the servomotor.
Furthermore, a pure proportional control mode is adopted between the first servo module and the second servo module.
Further, the first servo module and the second servo module are both of a type HSS 13.
Further, the first servo module and the second servo module are arranged in the cage.
Compared with the prior art, the utility model has the following advantages;
according to the control system for the redundant servo of the steam turbine valve regulator, the first servo module, the second servo module, the main controller, the first LVDT feedback loop and the second LVDT feedback loop are arranged, so that the risk of machine set shutdown caused by the problem of a single servo module is reduced, and the safety, the stability and the reliability of the machine set are improved. Thereby reducing the potential economic loss of the power plant.
In addition to the technical problems addressed by the present invention, the technical features constituting the technical solutions, and the advantageous effects brought by the technical features of the technical solutions described above, other technical problems that the present invention can solve, other technical features included in the technical solutions, and advantageous effects brought by the technical features will be described in further detail in the detailed description.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic connection diagram of a control system for redundant servo of a steam turbine governor according to an embodiment of the present invention;
FIG. 2 is a control schematic diagram of a control system for redundant servo of a steam turbine governor according to an embodiment of the present invention;
FIG. 3 is a control schematic of a single servo module;
fig. 4 is a control schematic of a single LVDT feedback loop.
Reference numerals:
1. a main controller; 2. a controller; 3. a first servo module; 4. a second servo module; 5. an electro-hydraulic converter; 6. an oil-operated machine; 7. a second LVDT feedback loop; 8. a first LVDT feedback loop.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the described embodiments are merely a few embodiments of the utility model, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, an embodiment of the present invention provides a control system for redundant servo of a steam turbine governor, including: the system comprises a first servo module 3, a second servo module 4, a main controller 1, a controller 2, a first LVDT feedback loop 8, a second LVDT feedback loop 7, an electro-hydraulic converter 5 and an oil motor 6;
as shown in fig. 1 and 2, the first servo module 3 and the second servo module 4 are both connected to the main controller 1, the first servo module 3 and the second servo module 4 are both connected to the controller 2, the first servo module 3 and the second servo module 4 are both connected to an electro-hydraulic converter 5, and the electro-hydraulic converter 5 is connected to the servomotor 6 to open or close the servomotor;
the first LVDT feedback loop 8 is connected with the first servo module 3, the second LVDT feedback loop 7 is connected with the second servo module 4, and the first LVDT feedback loop 8 and the second LVDT feedback loop 7 are both connected with the servomotor 6.
Specifically, the first servo module 3 and the second servo module 4 adopt a pure proportional control mode. The control of proportional integral is changed into the control of pure proportion, and the control mode of pure proportion is as follows: the controller's output signal c (t) can be proportional to its input signal epsilon (t); expressed mathematically, i.e.: c (t) kp epsilon (t). In the formula, kp is a proportionality coefficient; and a pure proportion control mode is arranged, so that mutual interference of the output instructions of the first servo module 3 and the second servo module 4 is eliminated.
In particular, the first servo module 3 and the second servo module 4 are each of the type HSS 13. The first servo module 3 and the second servo module 4 are both arranged in a cage.
It should be noted that the servo module and LVDT feedback loop are prior art. A unit turbine digital electro-hydraulic control system (DEH) can be referred to and a Symphony system produced by Beijing ABB belie engineering Co., Ltd; the control schematic diagram of the servo module is shown in FIG. 3, and the control schematic diagram of the LVDT feedback loop is shown in FIG. 4. In the application, a servo module and an LVDT feedback loop are added on the basis of the original servo module and the original LVDT feedback loop; no improvement was made to the servo module and LVDT feedback loop itself. And redundant coils of the LVDT feedback loop and the electro-hydraulic converter 5 form a fully redundant servo control system. The first servo module 3 and the second servo module are logically connected to the electro-hydraulic converter 5 through an AND gate to drive the electro-hydraulic converter 5.
It should be noted that the redundant controller includes a main controller 1 and a slave controller 2, and only the main controller 1 works during normal operation; when the main controller 1 fails, the redundant controller is automatically switched into the backup controller 2, and simultaneously, the commands are transmitted to the first servo module 3 and the second servo module 4; wherein the automatic switching of the main controller 1 and the controller 2 is prior art in DCS systems.
In actual operation the modified design is as follows,
first, the address of the first servo module 3 is No. 17, and the address of the second servo module 4 is No. 7 to form a redundant servo module control electro-hydraulic converter 5. The main controller 1 is connected with the first servo module 3 and the second servo module 4 through an IO bus; the controller 2 is connected with the first servo module 3 and the second servo module 4 through an IO bus.
Second, the first servo module 3 and the second servo module 4 are connected to the terminal block through signal cables.
Thirdly, modifying FC55 function codes S2, S3 and S4 of the first servo module 3 and the second servo module 4;
s2 and S3 select the first LVDT feedback loop 8 and the output of the first servo module 3 according to actual conditions, the first servo output is 0V when the S4 is set as the LVDT error, and the output of the first servo module 3 can be cut off when the first servo module 3 has problems through the setting of S4, so that the first servo module 3 is prevented from causing interference; the electro-hydraulic converter 5 can also be controlled by a second servo module in this case. Meanwhile, the servo module triggers an output inhibition function under certain conditions, such as timeout of a watchdog caused by mechanical failure of the module D or A error, and the servo module resets an output command to zero at the moment, and in this case, the other redundant module controls normal opening and closing of a valve.
Fourthly, the manual tracking logic is modified, when the first servo module 3 is off-line and is switched to the manual mode, the second servo module 4 also needs to track the instruction read-back value of the current first servo module, so that the first servo module 3 can be switched back to be automatic without disturbance after being recovered to be normal, and the electro-hydraulic converter 5 cannot generate disturbance.
The working principle is as follows:
the main controller 1 outputs an instruction to the first servo module 3 or the controller 2 to output an instruction to the second servo module, and then the instruction is compared with a position feedback instruction of the servomotor 6 of the first LVDT feedback loop 8 or the second LVDT feedback loop 7 respectively, and then the instruction is transmitted to the electrohydraulic converter 5, so that the opening degree of a valve core of the electrohydraulic converter 5 is changed, hydraulic oil in an oil cylinder of the servomotor 6 is changed, and the valve core of the servomotor 6 is moved to the position where the instruction is located; meanwhile, the misoperation of the servomotor caused by the fact that the output instruction is 0 due to the fact that the first servo module or the second servo module breaks down is avoided. And also facilitates on-line replacement of a faulty servo module.
Claims (4)
1. A control system for redundant servo of a steam turbine governor, comprising: the system comprises a first servo module, a second servo module, a main controller, a first LVDT feedback loop, a second LVDT feedback loop, an electro-hydraulic converter and an oil motor;
the first servo module and the second servo module are connected to the main controller, the first servo module and the second servo module are connected to the electro-hydraulic converter, and the electro-hydraulic converter is connected with the servomotor;
the first LVDT feedback loop is connected to the first servo module and the servomotor; the second LVDT feedback loop is connected with the second servo module, and the second LVDT feedback loop is connected with the servomotor.
2. The control system for redundant servo of a steam turbine governor according to claim 1, wherein the first servo module and the second servo module are controlled in a purely proportional manner.
3. The control system for redundant servo of a steam turbine governor according to claim 1, wherein said first and second servo modules are each of the type HSS 13.
4. The control system for redundant servo of a steam turbine governor according to claim 1, further comprising a cage, wherein the first and second servo modules are disposed in the cage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120524828.2U CN215369958U (en) | 2021-03-12 | 2021-03-12 | Redundant servo control system of steam turbine valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120524828.2U CN215369958U (en) | 2021-03-12 | 2021-03-12 | Redundant servo control system of steam turbine valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215369958U true CN215369958U (en) | 2021-12-31 |
Family
ID=79624425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120524828.2U Withdrawn - After Issue CN215369958U (en) | 2021-03-12 | 2021-03-12 | Redundant servo control system of steam turbine valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215369958U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688065A (en) * | 2022-02-15 | 2022-07-01 | 北京瑞赛长城航空测控技术有限公司 | Quiet leaf angle control system of axial fan |
-
2021
- 2021-03-12 CN CN202120524828.2U patent/CN215369958U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688065A (en) * | 2022-02-15 | 2022-07-01 | 北京瑞赛长城航空测控技术有限公司 | Quiet leaf angle control system of axial fan |
| CN114688065B (en) * | 2022-02-15 | 2024-05-28 | 北京瑞赛长城航空测控技术有限公司 | Axial flow fan stationary blade angle control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN215369958U (en) | Redundant servo control system of steam turbine valve | |
| CN103939154B (en) | Steam turbine governing valve redundancy control system and control method thereof | |
| CN102268497A (en) | Safety control method for TRT (Blast Furnace Top Gas Recovery Turbine Unit) fixed blade servo control system | |
| US4577281A (en) | Method and apparatus for controlling the control valve setpoint mode selection for an extraction steam turbine | |
| EP3810913B1 (en) | Turbine control system | |
| CN202628203U (en) | Integral control system for small steam turbine generator units | |
| CN105422540B (en) | A kind of method of TRT by-passing valves high-precision servo control | |
| CN113236378A (en) | Redundancy control system for regulating steam valve of steam turbine of water supply pump | |
| CN108733021B (en) | Method for dispersing double-AP fault risk of DCS (distributed control system) | |
| CN1058768C (en) | Digital control system for high pressure fire-resistant fluid of 200 MW turbine | |
| CN210239900U (en) | Hydraulic turbine speed regulator with start-stop protection function | |
| CN111520198A (en) | Emergency trip control mechanism of DEH system | |
| CN215057605U (en) | Redundancy control system for regulating steam valve of steam turbine of water supply pump | |
| CN113309660B (en) | Intelligent sectional closing control system and method for speed regulator | |
| CN112727819B (en) | Servo redundant control system of steam turbine | |
| CN212428961U (en) | Emergency trip control mechanism of DEH system | |
| CN204024728U (en) | A kind of steam turbine pitch redundancy control system | |
| CN212479417U (en) | Large-torque electrohydraulic speed regulator controller for diesel engine | |
| CN202560451U (en) | Double-regulation electrical combination device for rotating propeller type water turbine | |
| CN212774984U (en) | Steam turbine electrohydraulic regulating system | |
| US4550380A (en) | Microprocessor-based extraction turbine control | |
| CN101737170B (en) | Aeroengine generating system | |
| CN102635492B (en) | Double-regulating electric combined device and method of Kaplan turbine | |
| JP2005061346A (en) | Speed governing device for water turbine | |
| CN215172653U (en) | Redundant hydraulic servo control system of turbo generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20211231 Effective date of abandoning: 20240105 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20211231 Effective date of abandoning: 20240105 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |