CN117108437A - Hydropower station LCU opening analog open-loop control method and system - Google Patents
Hydropower station LCU opening analog open-loop control method and system Download PDFInfo
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- CN117108437A CN117108437A CN202311085222.3A CN202311085222A CN117108437A CN 117108437 A CN117108437 A CN 117108437A CN 202311085222 A CN202311085222 A CN 202311085222A CN 117108437 A CN117108437 A CN 117108437A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000012544 monitoring process Methods 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 125000004122 cyclic group Chemical group 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007363 regulatory process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
- F03B15/02—Controlling by varying liquid flow
- F03B15/04—Controlling by varying liquid flow of turbines
- F03B15/06—Regulating, i.e. acting automatically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
- F03B15/02—Controlling by varying liquid flow
- F03B15/04—Controlling by varying liquid flow of turbines
- F03B15/06—Regulating, i.e. acting automatically
- F03B15/16—Regulating, i.e. acting automatically by power output
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a hydropower station LCU opening analog open-loop control method system; the invention optimizes on the basis of the open-loop control method of the guide vane opening analog quantity of the hydropower station monitoring system in the original opening direction, and realizes the open-loop control method of the LCU opening analog quantity of the hydropower station in the opening and closing directions by adding the direction coefficient; the method has the characteristic of quick open loop control, meets the requirement of good speed in the adjusting process, and improves the dynamic adjusting quality.
Description
Technical Field
The invention relates to the technical field of hydropower station computer monitoring, in particular to a hydropower station LCU opening analog open-loop control method and system.
Background
At present, in the operation process of the hydroelectric generating set, a monitoring system usually adopts a power closed-loop conventional pulse regulation mode in an opening mode, and opening increasing and decreasing pulses are output to a speed regulator electric control system through an intermediate relay so as to control the opening of the hydroelectric generating set, so that the problems that the opening of a guide vane and the active power regulation speed are low, the regulation process is easily influenced by the reaction of a water hammer and the inertia of the set, and the like are solved. In order to overcome the defects, the China Yangtze river electric power Co., ltd. Filed an invention patent of a method and a system for open-loop control of the opening analog quantity of a guide vane of a hydropower station monitoring system (ZL 202011418712.7) are disclosed. The method is based on a data table corresponding to the water head, the active power and the guide vane opening, in an opening mode, the active power of the unit is quickly and accurately regulated in a mode of checking the corresponding data table, and a brand new method for outputting a guide vane opening analog control signal is adopted, so that the problems that the active power is slow in regulating speed, the regulating process is easily influenced by the reaction of a water hammer and the inertia of the unit and the like due to the adoption of a power closed loop conventional pulse regulating mode in the opening mode are solved, the speed of the regulating process is improved, the quick and stable control of the opening of the guide vane and the active power of the unit is realized, and the regulating quality is improved. However, the method only realizes an open-loop control method for the analog quantity of the opening degree of the guide vane of the hydropower station monitoring system in the opening direction. The method is optimized by research and improvement of Sanxia gold Sha Jiangchuan cloud water-electricity development limited company of the electric company of Yangtze river, china, and the whole company of the electric company of the Yangtze river.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a hydropower station LCU opening analog open-loop control method system, which is optimized on the basis of the original hydropower station monitoring system guide vane opening analog open-loop control method in the opening direction, and the hydropower station LCU opening analog open-loop control method in the opening and closing directions is realized by adding a direction coefficient.
In order to achieve the above purpose, the invention adopts the following technical scheme: an open loop control method for LCU opening analog quantity of a hydropower station comprises the following steps:
s1, initializing control parameters delta D, direction coefficients k and initializing water heads, and initializing data of a one-to-one correspondence table of active power and guide vane opening;
s2, the monitoring system collects the active power set value G Given a given The opening degree of the guide vane is fed back to D, and the water head w of the unit is fed back to the guide vane;
s3, detecting whether the monitoring system is in an opening mode or not, if so, entering a step S4; otherwise, adopting a non-opening mode control method, and returning to the step S2;
s4, detecting an active power given value G by a monitoring system Given a given Whether refreshing is carried out, if so, the step S5 is carried out; otherwise, go to step S9;
s5, the monitoring system gives a value G according to the active power Given a given And the current unit water head w is used for checking a water head, the active power and the guide vane opening one-to-one correspondence data table, and the corresponding guide vane opening value D is calculated Watch (watch) ；
S6、Control variable D Control of Giving an initial value D;
s7, detecting D by using monitoring system Watch (watch) If so, the step S9 is entered; otherwise, enter step S8;
s8, detecting D by using monitoring system Watch (watch) If so, go to step S9; otherwise, directly entering step S9;
S9、D control of ＝D Control of +k Δd, Δd being the control parameter increase step size;
s10, detecting whether k=1 by a monitoring system, if yes, entering a step S11; otherwise, go to step S12;
s11, detecting whether the monitoring system is D Control of >D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S14 is entered; otherwise, directly enter step S14;
s12, detecting whether k= -1 by the monitoring system, if yes, entering a step S13; otherwise, go to step S14;
s13, detecting whether the monitoring system is D Control of <D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S14 is entered; otherwise, directly enter step S14;
s14, the monitoring system outputs a guide vane opening analog quantity control signal D Control of And returning to the step S2.
As a further improvement of the present invention, step S5 is specifically as follows:
the water head, the active power and the guide vane opening degree one-to-one correspondence data table is as follows:
| W 1 | W 2 | … | W x-1 | W x | … | W p-1 | W p | |
| G 1 | D 1,1 | D 2,1 | … | D x-1，1 | D x，1 | … | D p-1,1 | D p，1 |
| G 2 | D 1,2 | D 2,2 | … | D x-1，2 | D x，2 | … | D p-1,2 | D p，2 |
| … | … | … | … | … | … | … | … | … |
| G y-1 | D 1，y-1 | D 2，y-1 | … | D x-1，y-1 | D x，y-1 | … | D p-1,y-1 | D p，y-1 |
| G y | D 1，y | D 2，y | … | D x-1，y | D x，y | … | D p-1,y | D p，y |
| … | … | … | … | … | … | … | … | … |
| G q-1 | D 1，q-1 | D 2，q-1 | … | D x-1，q-1 | D x，q-1 | … | D p-1,q-1 | D p，q-1 |
| G q | D 1，q | D 2，q | … | D x-1，q | D x，q | … | D p-1,q | D p，q |
in the table, p, q, x, y is a positive integer, x is more than 1 and less than or equal to p, y is more than 1 and less than or equal to q, dx and y are the opening degrees of guide vanes corresponding to the active power of Wx water head Gy;
if W is x-1 ≤w≤W x ，G y-1 ≤G Given a given ≤G y Then:
d table y-1 ＝D x-1，y-1 +(D x，y-1 -D x-1，y-1 )(w-W x-1 )/(W x -W x-1 )；
d Table y ＝D x-1，y +(D x，y -D x-1，y )(w-W x-1 )/(W x -W x-1 )；
D Watch (watch) ＝d Table y-1 +(d Table y -d Table y-1 )(G Given a given -G y-1 )/(G y -G y-1 )。
The invention also discloses an open loop control system for the LCU opening analog quantity of the hydropower station, which comprises the following steps:
a table lookup calculation module for collecting the active power given G Given a given And the water head w of the unit, the water head, the active power and the opening degree of the guide vane are calculated in a one-to-one correspondence table, and a calculation result D is output Watch (watch) Feeding the amplitude limiting module;
a cyclic self-adding module for monitoring D Watch (watch) Changing an enabling signal and collecting a guide vane opening signal D; when the enable signal acts, D Control of Giving an initial value D; the cyclic self-adding module continuously pairs D Control of Cyclic self-addition of k delta D, output D Control of Feeding the amplitude limiting module;
the limiting module is used for collecting D output by the table look-up calculation module Watch (watch) And D output by the cyclic self-adding module Control of For D Control of To output the clipping output, the maximum value is D if k=1 Watch (watch) If k= -1, the minimum value is D Watch (watch) The method comprises the steps of carrying out a first treatment on the surface of the The amplitude limiting module controls the analog quantity of the opening degree of the guide vane to be D Control of And outputting to the speed regulator electric control system.
The beneficial effects of the invention are as follows:
the control method can realize the bidirectional open-loop control of the switch, has the characteristic of quick open-loop control, meets the requirement of good speed in the adjusting process, and improves the dynamic adjusting quality. The concrete steps are as follows:
1. the bidirectional open-loop control of the switch can be realized.
2. The method has the characteristic of quick open-loop adjustment, thereby improving the speed of the adjustment process.
3. The influence of the water hammer reaction and the unit inertia in the adjusting process can be avoided through open loop control, and the risk of divergent oscillation of the whole control system is reduced.
Drawings
FIG. 1 is a flow chart of an open loop control method for LCU opening analog quantity of a hydropower station in an embodiment of the invention;
fig. 2 is a diagram of an open loop control structure of an LCU opening analog of a hydropower station according to an embodiment of the present invention.
Detailed Description
The power plant monitoring system is generally divided into a plant station layer and a local control unit layer. The local control unit layer is connected with the power station control network, and the local monitoring task of the designated equipment is completed by adopting a field bus technology.
The monitoring system in the invention particularly refers to a local control unit layer which is distributed according to controlled object units and consists of Local Control Units (LCUs) of a whole plant, wherein the local control unit layer comprises unit LCUs, station LCUs, public LCUs, switching station LCUs and dam top LCUs. Each Local Control Unit (LCU) comprises a PLC, a touch screen, network equipment, a cabinet and the like and is responsible for equipment data acquisition and processing, equipment state monitoring and process monitoring, equipment control and regulation and equipment information communication.
The unit LCU PLC adopts a Unity Quantum 67261 controller manufactured by French Schneider company.
The open-loop control method and the open-loop control system for the LCU opening analog quantity of the hydropower station are applied to a monitoring system of a certain power plant.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
The embodiment is an open-loop control method for the LCU opening analog quantity of the hydropower station in the on-off double directions. The hydropower station LCU opening analog open-loop control method is optimized on the basis of the hydropower station monitoring system guide vane opening analog open-loop control method in the original opening direction, and the hydropower station LCU opening analog open-loop control method in the opening and closing directions is realized by increasing the direction coefficient.
As shown in fig. 1, a hydropower station LCU opening analog open-loop control method comprises the following detailed process steps:
1. and initializing the control parameter delta D, the direction coefficient k, the water head, the active power and the guide vane opening one-to-one correspondence table data of the monitoring system, and entering the step 2.
2. The monitoring system collects the active power set value G Given a given And (3) feeding back the opening degree of the guide vane D, and feeding the unit water head w into the step 3.
3. The monitoring system detects whether the monitoring system is in an opening mode, if so, the monitoring system enters a step 4; otherwise, adopting a non-opening mode control method, and returning to the step 2.
4. The monitoring system detects the active power set value G Given a given Whether refreshing is carried out, if so, entering a step 5; otherwise, go to step 9.
5. The monitoring system is based on the active power set value G Given a given And the current unit water head w is used for checking a water head, the active power and the guide vane opening one-to-one correspondence data table, and the corresponding guide vane opening value D is calculated Watch (watch) 。
The data table of one-to-one correspondence of water head, active power and guide vane opening is shown in table 1. (p, q, x, y in the table is a positive integer, x is more than 1 and less than or equal to p, y is more than 1 and less than or equal to q, dx and y are guide vane opening degrees corresponding to Wx water head Gy active power) table 1 water head, one-to-one data table of active power and guide vane opening degrees
If W is x-1 ≤w≤W x ，G y-1 ≤G Given a given ≤G y Then:
d table y-1 ＝D x-1，y-1 +(D x，y-1 -D x-1，y-1 )(w-W x-1 )/(W x -W x-1 )。
d Table y ＝D x-1，y +(D x，y -D x-1，y )(w-W x-1 )/(W x -W x-1 )。
D Watch (watch) ＝d Table y-1 +(d Table y -d Table y-1 )(G Given a given -G y-1 )/(G y -G y-1 ). And (6) entering a step 6.
6. Control variable D Control of Giving an initial value D, and entering a step 7.
7. Monitoring system detects D Watch (watch) If the size is larger, if so, k=1, entering 9 steps; otherwise, go to step 8.
8. Monitoring system detects D Watch (watch) If the size is smaller, if so, k= -1, entering 9 steps; otherwise, go to step 9.
9、D Control of ＝D Control of +k represents Δd, Δd is the control parameter increasing step, and step 10 is entered.
10. The monitoring system detects whether k=1, if yes, step 11 is entered; otherwise, go to step 12.
11. Monitoring system detects whether D Control of >D Watch (watch) If yes, D Control of ＝D Watch (watch) Step 14, entering; otherwise, go to step 14.
12. The monitoring system detects whether k= -1, if yes, step 13 is entered; otherwise, go to step 14.
13. Monitoring system detects whether D Control of <D Watch (watch) If yes, D Control of ＝D Watch (watch) Step 14, entering; otherwise, go to step 14.
14. The monitoring system outputs a guide vane opening analog quantity control signal D Control of And returning to the step 2.
The open loop control structure diagram of the LCU opening analog quantity of the hydropower station in the embodiment is shown in fig. 2, and mainly comprises a table lookup calculation module 1, a circulating self-adding module 2 and an amplitude limiting module 3.
The table lookup calculation module 1 collects the active power given G Given a given And the water head w of the unit, the water head, the active power and the opening degree of the guide vane are calculated in a one-to-one correspondence table, and a calculation result D is output Watch (watch) To the clipping module 3.
Circulation self-adding module 2 monitoring D Watch (watch) And (3) changing an enabling signal and collecting a guide vane opening signal D. When the enable signal acts, D Control of The initial value D is assigned. The cyclic self-adding module 2 continuously adds the D Control of Cyclic self-addition of k delta D, output D Control of To the clipping module 3.
The limiting module 3 collects D output by the table look-up calculation module 1 Watch (watch) And D outputted by the cyclic self-adding module 2 Control of For D Control of To output the clipping output, the maximum value is D if k=1 Watch (watch) If k= -1, the minimum value is D Watch (watch) . The amplitude limiting module 3 controls the analog quantity of the opening degree of the guide vane to be controlled by a signal D Control of And outputting to the speed regulator electric control system.
The foregoing examples merely illustrate specific embodiments of the invention, which are described in greater detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (3)
1. The open-loop control method for the LCU opening analog quantity of the hydropower station is characterized by comprising the following steps of:
s1, initializing control parameters delta D, direction coefficients k and initializing water heads, and initializing data of a one-to-one correspondence table of active power and guide vane opening;
s2, the monitoring system collects the active power set value G Given a given The opening degree of the guide vane is fed back to D, and the water head w of the unit is fed back to the guide vane;
s3, detecting whether the monitoring system is in an opening mode or not, if so, entering a step S4; otherwise, adopting a non-opening mode control method, and returning to the step S2;
s4, detecting an active power given value G by a monitoring system Given a given Whether refreshing is carried out, if so, the step S5 is carried out; otherwise, go to step S9;
s5, the monitoring system gives a value G according to the active power Given a given And the current unit water head w is used for checking a water head, the active power and the guide vane opening one-to-one correspondence data table, and the corresponding guide vane opening value D is calculated Watch (watch) ；
S6, controlling variable D Control of Giving an initial value D;
s7, detecting D by using monitoring system Watch (watch) If it is larger, if so, k=1, go to stepS9, performing S9; otherwise, enter step S8;
s8, detecting D by using monitoring system Watch (watch) If so, go to step S9; otherwise, directly entering step S9;
S9、D control of ＝D Control of +k Δd, Δd being the control parameter increase step size;
s10, detecting whether k=1 by a monitoring system, if yes, entering a step S11; otherwise, go to step S12;
s11, detecting whether the monitoring system is D Control of >D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S14 is entered; otherwise, directly enter step S14;
s12, detecting whether k= -1 by the monitoring system, if yes, entering a step S13; otherwise, go to step S14;
s13, detecting whether the monitoring system is D Control of <D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S14 is entered; otherwise, directly enter step S14;
s14, the monitoring system outputs a guide vane opening analog quantity control signal D Control of And returning to the step S2.
2. The hydropower station LCU opening analog open-loop control method according to claim 1, wherein the step S5 is specifically as follows:
the water head, the active power and the guide vane opening degree one-to-one correspondence data table is as follows:
in the table, p, q, x, y is a positive integer, x is more than 1 and less than or equal to p, y is more than 1 and less than or equal to q, dx and y are the opening degrees of guide vanes corresponding to the active power of Wx water head Gy;
if W is x-1 ≤w≤W x ，G y-1 ≤G Given a given ≤G y Then:
d table y-1 ＝D x-1，y-1 +(D x，y-1 -D x-1，y-1 )(w-W x-1 )/(W x -W x-1 )；
d Table y ＝D x-1，y +(D x，y -D x-1，y )(w-W x-1 )/(W x -W x-1 )；
D Watch (watch) ＝d Table y-1 +(d Table y -d Table y-1 )(G Given a given -G y-1 )/(G y -G y-1 )。
3. An open loop control system for LCU opening analog quantity of a hydropower station, which is characterized by comprising:
a table lookup calculation module for collecting the active power given G Given a given And the water head w of the unit, the water head, the active power and the opening degree of the guide vane are calculated in a one-to-one correspondence table, and a calculation result D is output Watch (watch) Feeding the amplitude limiting module;
a cyclic self-adding module for monitoring D Watch (watch) Changing an enabling signal and collecting a guide vane opening signal D; when the enable signal acts, D Control of Giving an initial value D; the cyclic self-adding module continuously pairs D Control of Cyclic self-addition of k delta D, output D Control of Feeding the amplitude limiting module;
the limiting module is used for collecting D output by the table look-up calculation module Watch (watch) And D output by the cyclic self-adding module Control of For D Control of To output the clipping output, the maximum value is D if k=1 Watch (watch) If k= -1, the minimum value is D Watch (watch) The method comprises the steps of carrying out a first treatment on the surface of the The amplitude limiting module controls the analog quantity of the opening degree of the guide vane to be D Control of And outputting to the speed regulator electric control system.
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