CN117128124A - Primary frequency modulation performance control method and system for realizing and improving hydropower station LCU opening analog quantity subsection open-loop control - Google Patents
Primary frequency modulation performance control method and system for realizing and improving hydropower station LCU opening analog quantity subsection open-loop control Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 84
- 238000012544 monitoring process Methods 0.000 claims abstract description 129
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 125000004122 cyclic group Chemical group 0.000 claims description 46
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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
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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
- F03B15/16—Regulating, i.e. acting automatically by power output
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a primary frequency modulation performance control method and a system for realizing and improving hydropower station LCU opening analog quantity subsection open-loop control; optimizing on the basis of an open-loop control method and a structure of an opening analog quantity of an opening mode guide vane of a raw water power station monitoring system, calculating a primary frequency modulation power target value by adopting a primary frequency modulation power target value calculation superposition method, and calculating an active power set value G Given a given Superimposed primary frequency modulation power target value to form power target value G Target object Meanwhile, the direction coefficient is increased, so that the bidirectional primary frequency modulation function is realized, the bidirectional primary frequency modulation function is enhanced, and the problems of AGC and primary frequency modulation coordination control in a hydropower station LCU opening analog segmentation open-loop control mode are solved.
Description
Technical Field
The invention relates to the technical field of hydropower station computer monitoring, in particular to a primary frequency modulation performance control method and system for realizing and improving hydropower station LCU opening analog quantity subsection open-loop control.
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 applies for an invention patent 'guide vane opening analog quantity subsection open-loop control method and system' (ZL 202011420862.1) and discloses a method and system. Based on a data table corresponding to the water head, the active power and the opening of the guide vane, 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 guide vane opening analog control signal is output. The method aims at solving the problems that the power closed loop conventional pulse adjusting mode is adopted in the opening mode, the active power adjusting speed is low, the adjusting process is easily influenced by the water hammer reaction and the unit inertia effect, and the like, improving the speed of the adjusting process, realizing the quick and stable control of the opening degree of the guide vane of the unit and the active power, and improving the adjusting quality. However, the method does not realize the primary frequency modulation function, and solves the problems of AGC and primary frequency modulation coordination control. The three gorges Sha Jiangchuan cloud water electric development limited company of the whole resource company of the electric power share limited company of the Yangtze river of China is researched and improved on the basis, and the problem is solved.
Disclosure of Invention
In order to solve the problems existing in the prior art, the invention aims to provide a primary frequency modulation performance control method and system for realizing and improving hydropower station LCU opening analog quantity subsection open-loop control, the invention realizes the locking function of AGC and primary frequency modulation direction, and when the AGC and primary frequency modulation action directions are opposite, the locking AGC command active power gives G Given a given And the bidirectional primary frequency modulation function of on/off is enhanced, and the problems of AGC and primary frequency modulation coordination control in a hydropower station LCU opening analog quantity segmentation open-loop control mode are solved.
In order to achieve the above purpose, the invention adopts the following technical scheme: a primary frequency modulation performance control method for realizing hydropower station LCU opening analog quantity subsection open-loop control comprises the following steps:
s1, initializing control parameters delta D, delta D1, direction coefficient k and frequency dead zone E of a monitoring system f The limiting coefficient K1 and the data of a one-to-one correspondence table of the active power and the opening degree of the guide vane are initialized;
s2, the monitoring system collects the active power set value G Given n Guide vane opening feedback D, unit frequency f g Frequency givingF is fixed c A unit water head w;
s3, detecting whether the monitoring system is in an opening mode or not, if so, entering a step S4; otherwise, adopting non-opening mode control, and returning to the step S2;
s4, calculating a primary frequency modulation power target value P yctp ；
S5, calculating a given change value delta G of power Given a given ＝G Given n -G Given n-1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein G is Given n-1 Collecting an active power given value for an upper cycle period monitoring system;
s6, detecting delta G Given a given And P yctp Whether or not to be in the same direction, if so, G Given a given ＝G Given n Step S7 is entered; otherwise, directly entering step S7;
s7, P yctp Superimposed on G Given a given Power target value G Target object ＝G Given a given +P yctp ；
S8, the monitoring system monitors the target value G according to the power Target object 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) ；
S9, detecting D by using monitoring system Watch (watch) Whether or not to become larger, if so, k=1, d Control of =d, proceed to step S11; otherwise, go to step S10;
s10, detecting D by using monitoring system Watch (watch) Whether or not to become smaller, if so, k= -1, d Control of =d, proceed to step S11; otherwise, directly entering step S11;
s11, detecting whether the monitoring system is |D Watch (watch) D is ∈D1, if D is ∈D1 Control of ＝D Control of +k represents DeltaD, deltaD is the step size of increasing and decreasing the control parameter, and the step S12 is entered; otherwise, D Control of ＝D Control of -k Δd, step S16;
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 >K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s14, detecting whether k= -1 by the monitoring system, if yes, entering a step S15; otherwise, go to step S20;
s15, detecting whether the monitoring system detects D Control of <K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s16, detecting whether k=1 by the monitoring system, if yes, entering a step S17; otherwise, go to step S18;
s17, detecting whether the monitoring system is D Control of <D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s18, detecting whether k= -1 or not by the monitoring system, if yes, entering a step S19; otherwise, go to step S20;
s19, detecting whether the monitoring system detects D Control of >D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s20, outputting a guide vane opening analog quantity control signal D by the monitoring system Control of N++, and returns to step S2.
As a further improvement of the present invention, in step S4, a primary frequency modulation power target value P is calculated yctp The method comprises the following steps:
if f c -f g >E f P is then yctp ＝(f c -f g -E f )/E p ；
If f c -f g <-E f P is then yctp ＝(f c -f g +E f )/E p ；
If |f c -f g |≤E f P is then yctp ＝0。
As a further improvement of the present invention, step S8 is specifically as follows:
the data table of the one-to-one correspondence of the water head, the active power and the opening degree of the guide vane 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 provides a primary frequency modulation performance control system for realizing the segmental open-loop control of the LCU opening analog quantity of the hydropower station, which comprises the following steps:
a table look-up calculation module for collecting the power target value G Target object 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) The method comprises the steps of feeding a limiting 1 module and a limiting 2 module;
a cyclic self-adding module for monitoring D Watch (watch) Varying and |D Watch (watch) -d|++Δd1 enable signal and collecting the vane opening signal D; when the enable signal is initially operated, 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 Giving the amplitude limiting 1 module;
the limiting 1 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 When k=1, the maximum value is K1×d, which is the clipping output Watch (watch) If k= -1, the minimum value is K1D Watch (watch) The method comprises the steps of carrying out a first treatment on the surface of the Outputting a guide vane opening analog quantity control signal D Control of To selector module 6Lane 0;
a cyclic self-subtracting module for monitoring Watch (watch) -D∣<A delta D1 enabling signal and collecting a guide vane opening signal D; the cyclic self-subtracting module continuously pairs D Control of Cyclic self-subtracting k.DELTA.D, output D Control of Giving a limiting 2 module;
the limiting 2 module collects D output by the table look-up calculation module Watch (watch) And D output by the cyclic self-subtracting module Control of For D Control of A clipping output is performed for a minimum value D if k=1 Watch (watch) If k= -1, the maximum value is D Watch (watch) The method comprises the steps of carrying out a first treatment on the surface of the Outputting a guide vane opening analog quantity control signal D Control of Channel 1 to the selector module;
a selector module for monitoring Watch (watch) -D∣<Delta D1 selection signal, and collecting guide vane opening analog quantity control signal D output to selector module by amplitude limiting 1 module and amplitude limiting 2 module Control of The method comprises the steps of carrying out a first treatment on the surface of the When |D Watch (watch) -D∣<When DeltaD 1 is not satisfied, the selector module selects the channel 0 and outputs the analog quantity control signal D of the guide vane opening degree of the selector module to the amplitude limiting 1 module Control of The method comprises the steps of carrying out a first treatment on the surface of the When |D Watch (watch) -D∣<When DeltaD 1 is met, the selector module selects the channel 1, and outputs an analog quantity control signal D of the guide vane opening degree of the selector module to the amplitude limiting 2 module And (5) controlling. The method comprises the steps of carrying out a first treatment on the surface of the The selector 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 invention also provides a primary frequency modulation performance control method for improving hydropower station LCU opening analog quantity subsection open-loop control, which comprises the following steps:
s1, initializing control parameters delta D, delta D1, direction coefficient k and frequency dead zone E of a monitoring system f Initializing table data of one-to-one correspondence between limiting coefficient K1 and active power and guide vane opening of an initializing water head;
s2, the monitoring system collects the active power set value G Given n Guide vane opening feedback D, unit frequency f g Frequency is given f c A unit water head w;
s3, detecting whether the monitoring system is in an opening mode or not, if so, entering a step S4; otherwise, adopting non-opening mode control, and returning to the step S2;
s4, calculating a primary frequency modulation power target value P yctp ；
S5, calculating a primary frequency modulation opening target value Y yctp ；
S6, calculating a given change value delta G of power Given a given ＝G Given n -G Given n-1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein G is Given n-1 Collecting an active power given value for an upper cycle period monitoring system;
s7, detecting delta G Given a given And P yctp Whether or not to be in the same direction, if so, G Given a given ＝G Given n Step S8 is carried out; otherwise, directly entering step S8;
s8, the monitoring system gives 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) ；
S9, detecting D by using monitoring system Watch (watch) Whether or not to become larger, if so, k=1, d Control of =d, proceed to step S11; otherwise, go to step S10;
s10, detecting D by using monitoring system Watch (watch) Whether or not to become smaller, if so, k= -1, d Control of =d, proceed to step S11; otherwise, directly entering step S11;
s11, detecting whether the monitoring system is |D Watch (watch) D is ∈D1, if D is ∈D1 Control of ＝D Control of +k represents DeltaD, deltaD is the step size of increasing and decreasing the control parameter, and the step S12 is entered; otherwise, D Control of ＝D Control of -k Δd, step S16;
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 >K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s14, detecting whether k= -1 by the monitoring system, if yes, entering a step S15; otherwise, go to step S20;
s15, monitoring systemThe system detects whether D Control of <K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s16, detecting whether k=1 by the monitoring system, if yes, entering a step S17; otherwise, go to step S18;
s17, detecting whether the monitoring system is D Control of <D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s18, detecting whether k= -1 or not by the monitoring system, if yes, entering a step S19; otherwise, go to step S20;
s19, detecting whether the monitoring system detects D Control of >D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s20, calculating D' Control of ＝D Control of +Y yctp ；
S21, the monitoring system outputs a guide vane opening analog quantity control signal D' Control of N++, returning to the step S2.
As a further improvement of the present invention, in step S1, the one-to-one correspondence of the head, active power and vane opening 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 above table, p, q, x, x, x2, y1 and y2 are positive integers, x is more than 1 and less than or equal to p, y is more than 1 and less than or equal to q, D x,y Is W x Water head G y And the opening degree of the guide vane corresponding to the active power.
As a further improvement of the present invention, in step S4, a primary frequency modulation power target value P is calculated yctp The method comprises the following steps:
if f c -f g >E f P is then yctp ＝(f c -f g -E f )/E p ；
If f c -f g <-E f P is then yctp ＝(f c -f g +E f )/E p ；
If |f c -f g |≤E f P is then yctp ＝0。
As a further improvement of the present invention, in step S5, a primary frequency modulation opening target value Y is calculated yctp The method comprises the following steps:
if W is x1-1 ≤w≤W x1 ，G y1-1 ≤P g ≤G y1 Then:
d TABLE y1-1 ＝D x1-1，y1-1 +(D x1，y1-1 -D x1-1，y1-1 )(w-W x1-1 )/(W x1 -W x1-1 )；
d Table y1 ＝D x1-1，y1 +(D x1，y1 -D x1-1，y1 )(w-W x1-1 )/(W x1 -W x1-1 )；
D TABLE 1 ＝d TABLE y1-1 +(d Table y1 -d TABLE y1-1 )(P g -G y1-1 )/(G y1 -G y1-1 )；
The water head w and the power P of the unit can be obtained g Corresponding opening Y w,pg ＝D TABLE 1 ＝d Table y-1 +(d Table y -d Table y-1 )(P g -G y-1 )/(G y -G y-1 )；
If W is x2-1 ≤w≤W x2 ，G y2-1 ≤P g +P yctp ≤G y2 Then:
d table y2-1 ＝D x2-1，y2-1 +(D x2，y2-1 -D x2-1，y2-1 )(w-W x2-1 )/(W x2 -W x2-1 )；
d Table y2 ＝D x2-1，y2 +(D x2，y2 -D x2-1，y2 )(w-W x2-1 )/(W x2 -W x2-1 )；
D TABLE 2 ＝d Table y2-1 +(d Table y2 -d Table y2-1 )(P g +P yctp -G y2-1 )/(G y2 -G y2-1 )；
The water head w and the power P of the unit can be obtained by the same method g +P yctp Corresponding opening Y w,pg+pyctp ＝D TABLE 2 ＝d Table y2-1 +(d Table y2 -d Table y2-1 )(P g -G y2-1 )/(G y2 -G y2-1 )；
Y is then yctp ＝Y w,pg+pyctp -Y w,pg 。
As a further development of the invention, in step S8, a corresponding vane opening value D is calculated Watch (watch) The method comprises the following steps:
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 provides a primary frequency modulation performance control system for improving hydropower station LCU opening analog quantity subsection open-loop control, which comprises the following steps:
table lookup calculation 1 module for collecting 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) The method comprises the steps of feeding a limiting 1 module and a limiting 2 module;
a cyclic self-adding module for monitoring D Watch (watch) Varying and |D Watch (watch) -d|++Δd1 enable signal and collecting the vane opening signal D; when the enable signal is initially operated, 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 Giving the amplitude limiting 1 module;
the limiting 1 module is used for collecting D output by the table look-up calculation 1 module Watch (watch) And D output by the cyclic self-adding module Control of For D Control of Performing clippingOutput, if k=1, maximum value is K1D Watch (watch) If k= -1, the minimum value is K1D Watch (watch) The method comprises the steps of carrying out a first treatment on the surface of the Outputting a guide vane opening analog quantity control signal D Control of Channel 0 to the selector module;
a cyclic self-subtracting module for monitoring Watch (watch) -D∣<A delta D1 enabling signal and collecting a guide vane opening signal D; the cyclic self-subtracting module continuously pairs D Control of Cyclic self-subtracting k.DELTA.D, output D Control of Giving a limiting 2 module;
the limiting 2 module is used for collecting D output by the table look-up calculation 1 module Watch (watch) And D output by the cyclic self-subtracting module Control of For D Control of To output the clipping, if k=1, the minimum value is D Watch (watch) If k= -1, the maximum value is D Watch (watch) The method comprises the steps of carrying out a first treatment on the surface of the Outputting a guide vane opening analog quantity control signal D Control of Channel 1 to the selector module;
a selector module for monitoring Watch (watch) -D∣<Delta D1 selection signal, and collecting guide vane opening analog quantity control signal D output to selector module by amplitude limiting 1 module and amplitude limiting 2 module Control of The method comprises the steps of carrying out a first treatment on the surface of the When |D Watch (watch) -D∣<When DeltaD 1 is not satisfied, the selector module selects the channel 0 and outputs the analog quantity control signal D of the guide vane opening degree of the selector module to the amplitude limiting 1 module Control of The method comprises the steps of carrying out a first treatment on the surface of the When |D Watch (watch) -D∣<When DeltaD 1 is met, the selector module selects the channel 1, and outputs an analog quantity control signal D of the guide vane opening degree of the selector module to the amplitude limiting 2 module Control of The method comprises the steps of carrying out a first treatment on the surface of the The selector module controls the analog quantity of the opening degree of the guide vane to be D Control of Outputting the primary frequency modulation opening target value Y calculated by a table look-up calculation 2 module yctp After superposition, outputting a guide vane opening analog quantity control signal D' Control of Giving an electric control system of the speed regulator;
table lookup calculation 2 module for calculating power P according to unit g Primary frequency modulation power target value P yctp And the current unit water head w is used for checking a water head, the active power and the guide vane opening degree one-to-one correspondence data table, and calculating and outputting a primary frequency modulation opening degree target value Y yctp Superimposed to D output by selector module 6 Control of On, output the analog quantity control signal D 'of the opening degree of the guide vane' Control of To the governor electrical control system.
The beneficial effects of the invention are as follows:
1. the invention realizes the control of primary frequency modulation performance of a hydropower station LCU opening analog quantity subsection open-loop control mode, optimizes on the basis of an opening mode guide vane opening analog quantity open-loop control method and structure of a raw water power station monitoring system, calculates a primary frequency modulation power target value by adopting a primary frequency modulation power target value calculation superposition method, and calculates the primary frequency modulation power target value at an active power given value G Given a given Superimposed primary frequency modulation power target value to form power target value G Target object Meanwhile, the direction coefficient is increased, so that the bidirectional primary frequency modulation function is realized, and the problems of AGC and primary frequency modulation coordination control in a hydropower station LCU opening analog segmentation open-loop control mode are solved.
2. The control structure and the method for improving the primary frequency modulation performance of the hydropower station LCU opening analog quantity open-loop control mode optimize on the basis of the method and the structure for controlling the primary frequency modulation performance of the original water power station monitoring system opening mode guide vane opening analog quantity in a sectionalized open-loop mode, calculate the primary frequency modulation opening target value by adopting a primary frequency modulation opening target value calculation superposition method through a water head, active power and guide vane opening one-to-one correspondence data table, and superpose the primary frequency modulation opening target value on guide vane opening analog quantity control signal D control output to a speed regulator electric control system, and aim to improve the primary frequency modulation opening and power regulation response speed and the integral electric quantity contributed by the regulation process so as to meet the primary frequency modulation performance requirement of a power grid on the hydropower station, and meanwhile, do not influence the normal active power regulation performance of the machine set, and avoid low-frequency oscillation of the power grid caused by too fast regulation response speed.
Drawings
FIG. 1 is a flow chart of the method of embodiment 1 of the present invention;
FIG. 2 is a system block diagram of embodiment 1 of the present invention;
FIG. 3 is a flow chart of the method of embodiment 2 of the present invention;
fig. 4 is a system block diagram of embodiment 2 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 method and the system 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.
Example 1
As shown in fig. 1, a control method for realizing primary frequency modulation performance of a hydropower station LCU opening analog quantity subsection open-loop control mode is detailed, and the detailed process steps are as follows:
1. control parameters delta D, delta D1, direction coefficient k and frequency dead zone E of monitoring system f Initializing table data corresponding to the limiting coefficient K1, the water head, the active power and the opening degree of the guide vane one by one, and entering the step 2.
2. The monitoring system collects the active power set value G Given n Guide vane opening feedback D, unit frequency f g Frequency is given f c And (3) a unit water head w enters 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. Calculating primary frequency modulation power target value P yctp And (5) entering a step 5.
Calculating primary frequency modulation power target value P yctp The method comprises the following steps:
if f c -f g >E f P is then yctp ＝(f c -f g -E f )/E p ；
If f c -f g <-E f P is then yctp ＝(f c -f g +E f )/E p ；
If |f c -f g |≤E f P is then yctp ＝0。
5. Calculating a power given change value DeltaG Given a given ＝G Given n -G Given n-1 And (6) entering a step. G Given n-1 And collecting an active power given value for the upper cycle period monitoring system.
6. Detecting ΔG Given a given And P yctp Whether or not to be in the same direction, if so, G Given a given ＝G Given n Step 7, entering a step; otherwise, go to step 7.
7. Will P yctp Superimposed on G Given a given Power target value G Target object ＝G Given a given +P yctp And (8) entering the step (8).
8. The monitoring system is based on the power target value G Target object 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
| 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 |
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 ). Step 9 is entered.
9. Monitoring system detects D Watch (watch) Whether or not to become larger, if so, k=1, d Control of =d, go to 11 steps; otherwise, go to step 10.
10. Monitoring system detects D Watch (watch) Whether or not to become smaller, if so, k= -1, d Control of =d go to 11 steps; otherwise, go to step 11.
11. Monitoring system detects |D Watch (watch) D is ∈D1, if D is ∈D1 Control of ＝D Control of +k represents DeltaD, deltaD is the step length of increasing and decreasing the control parameter, and the step 12 is entered; otherwise, D Control of ＝D Control of -k Δd, go to step 16.
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 >K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step 20, entering; otherwise, go to step 20.
14. The monitoring system detects whether k= -1, if yes, 15 steps are entered; otherwise, go to step 20.
15. Monitoring system detects whether D Control of <K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step 20, entering; otherwise, go to step 20.
16. The monitoring system detects whether k=1, if yes, 17 steps are carried out; otherwise, go to step 18.
17. Monitoring system detects whether D Control of <D Watch (watch) If yes, D Control of ＝D Watch (watch) Step 20, entering; otherwise, go to step 20.
18. The monitoring system detects whether k= -1, if yes, 19 steps are entered; otherwise, go to step 20.
19. Monitoring system detects whether D Control of >D Watch (watch) If yes, D Control of ＝D Watch (watch) Step 20, entering; otherwise, go to step 20.
20. The monitoring system outputs a guide vane opening analog quantity control signal D Control of N++, return to step 2.
The control structure diagram for realizing the primary frequency modulation performance of the hydropower station LCU opening analog segmentation open-loop control mode is shown in fig. 2, and mainly comprises a table lookup calculation module 1, a cyclic self-adding module 2, a limiting 1 module 3, a cyclic self-subtracting module 4, a limiting 2 module 5 and a selector module 6.
The table lookup calculation module 1 collects the power target value G Target object 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 1 module 3 and the clipping 2 module 5.
Circulation self-adding module 2 monitoring D Watch (watch) Varying and |D Watch (watch) -d|ΣΔd1 enable signal and collecting the vane opening signal D. When the enable signal is initially operated, 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 1 module 3.
D outputted by table look-up calculation module 1 is collected by amplitude limiting 1 module 3 Watch (watch) And D outputted by the cyclic self-adding module 2 Control of For D Control of To output the clipping, if k=1, the maximum value is K1D Watch (watch) If k= -1, the minimum value is K1D Watch (watch) . K1 is usually 1.4. Outputting a guide vane opening analog quantity control signal D Control of Channel 0 is given to the selector module 6.
Loop self-subtracting module 4 monitors |d Watch (watch) -D∣<And delta D1 is an enabling signal, and a guide vane opening signal D is acquired. The cyclic self-subtracting module 4 continuously outputs D Control of Cyclic self-subtracting k.DELTA.D, output D Control of To the clipping 2 block 5.
D outputted by table look-up calculation module 1 is collected by amplitude limiting 2 module 5 Watch (watch) And D outputted from the subtraction module 4 Control of For D Control of To output the clipping, if k=1, the minimum value is D Watch (watch) If k= -1, the maximum value is D Watch (watch) . Outputting a guide vane opening analog quantity control signal D Control of Channel 1 is given to selector module 6.
Selector module 6 monitors |D Watch (watch) -D∣<Delta D1 selection signal, and collecting guide vane opening analog quantity control signal D output to selector module 6 by amplitude limiting 1 module 3 and amplitude limiting 2 module 5 Control of . When |D Watch (watch) -D∣<When Δd1 is not satisfied, the selector module 6 selects the channel 0, and the output limiter 1 module 3 outputs the guide vane opening analog control signal D to the selector module 6 Control of The method comprises the steps of carrying out a first treatment on the surface of the When |D Watch (watch) -D∣<When Δd1 is satisfied, the selector module 6 selects the channel 1, and the output limiter 2 module 5 outputs the guide vane opening analog control signal D to the selector module 6 And (5) controlling. The selector module 6 outputs the guide vane opening analog control signal D Control of And outputting to the speed regulator electric control system.
Example 2
The embodiment realizes and enhances the on-off bidirectional primary frequency modulation function, and solves the problems of AGC and primary frequency modulation coordination control in a hydropower station LCU opening analog segmentation open-loop control mode; realizing the locking function of AGC and primary frequency modulation direction, when the AGC and primary frequency modulation action direction are opposite, locking AGC command active power to give G Given a given 。
As shown in fig. 3, a control method for improving primary frequency modulation performance of a hydropower station LCU opening analog quantity subsection open-loop control mode according to the embodiment includes the following detailed process steps:
1. control parameters delta D, delta D1, direction coefficient k and frequency dead zone E of monitoring system f Initializing table data corresponding to the limiting coefficient K1, the water head, the active power and the opening degree of the guide vane one by one, and entering the step 2.
2. The monitoring system collects the active power set value G Given n Guide vane opening feedback D, unit frequency f g Frequency is given f c And (3) a unit water head w enters 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. Calculating primary frequency modulation power target value P yctp And (5) entering a step 5.
5. Calculating a primary frequency modulation opening target value Y yctp And (6) entering a step.
6. Calculating a power given change value DeltaG Given a given ＝G Given n -G Given n-1 And (7) entering a step 7. G Given n-1 And collecting an active power given value for the upper cycle period monitoring system.
7. Detecting ΔG Given a given And P yctp Whether or not to be in the same direction, if so, G Given a given ＝G Given n Step 8, entering a step; otherwise, go to step 8.
8. The monitoring system gives 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) 。
The one-to-one correspondence data table of the water head, the active power and the guide vane opening is shown in the following table. (wherein 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 degree of the guide vane corresponding to the active power of Wx water head Gy)
| 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 |
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 ). Step 9 is entered.
9. Monitoring system detects D Watch (watch) Whether or not to become larger, if so, k=1, d Control of =d, go to 11 steps; otherwise, go to step 10.
10. Monitoring system detects D Watch (watch) Whether or not to become smaller, if so, k= -1, d Control of =d go to 11 steps; otherwise, go to step 11.
11. Monitoring system detects |D Watch (watch) D is ∈D1, if D is ∈D1 Control of ＝D Control of +k represents DeltaD, deltaD is the step length of increasing and decreasing the control parameter, and the step 12 is entered; otherwise, D Control of ＝D Control of -k Δd, go to step 16.
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 >K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step 20, entering; otherwise, go to step 20.
14. The monitoring system detects whether k= -1, if yes, 15 steps are entered; otherwise, go to step 20.
15. Monitoring system detects whether D Control of <K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step 20, entering; otherwise, go to step 20.
16. The monitoring system detects whether k=1, if yes, 17 steps are carried out; otherwise, go to step 18.
17. Monitoring system detects whether D Control of <D Watch (watch) If yes, D Control of ＝D Watch (watch) Step 20, entering; otherwise, go to step 20.
18. The monitoring system detects whether k= -1, if yes, 19 steps are entered; otherwise, go to step 20.
19. Monitoring system detects whether D Control of >D Watch (watch) If yes, D Control of ＝D Watch (watch) Step 20, entering; otherwise, go to step 20.
20. Calculate D' Control of ＝D Control of +Y yctp Step 21 is entered.
21. The monitoring system outputs a guide vane opening analog quantity control signal D' Control of N++, return to step 2.
In step 4, a primary frequency modulation power target value P is calculated yctp The method comprises the following steps:
if f c -f g >E f P is then yctp ＝(f c -f g -E f )/E p ；
If f c -f g <-E f P is then yctp ＝(f c -f g +E f )/E p ；
If |f c -f g |≤E f P is then yctp ＝0。
In step 5, calculating a primary frequency modulation opening target value Y yctp The method comprises the following steps:
the data table of one-to-one correspondence of water head, active power and guide vane opening is shown as the following table, wherein p, q, x, x, x2, y1 and y2 are all positive integers, x is more than 1 and less than or equal to p, y is more than 1 and less than or equal to q, and D x,y Is W x Water head G y The opening degree of the guide vane corresponding to the active power;
| 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 |
if W is x1-1 ≤w≤W x1 ，G y1-1 ≤P g ≤G y1 Then:
d TABLE y1-1 ＝D x1-1，y1-1 +(D x1，y1-1 -D x1-1，y1-1 )(w-W x1-1 )/(W x1 -W x1-1 )。
d Table y1 ＝D x1-1，y1 +(D x1，y1 -D x1-1，y1 )(w-W x1-1 )/(W x1 -W x1-1 )。
D TABLE 1 ＝d TABLE y1-1 +(d Table y1 -d TABLE y1-1 )(P g -G y1-1 )/(G y1 -G y1-1 )；
The water head w and the power P of the unit can be obtained g Corresponding opening Y w,pg ＝D TABLE 1 ＝d Table y-1 +(d Table y -d Table y-1 )(P g -G y-1 )/(G y -G y-1 )
If W is x2-1 ≤w≤W x2 ，G y2-1 ≤P g +P yctp ≤G y2 Then
d Table y2-1 ＝D x2-1，y2-1 +(D x2，y2-1 -D x2-1，y2-1 )(w-W x2-1 )/(W x2 -W x2-1 )。
d Table y2 ＝D x2-1，y2 +(D x2，y2 -D x2-1，y2 )(w-W x2-1 )/(W x2 -W x2-1 )。
D TABLE 2 ＝d Table y2-1 +(d Table y2 -d Table y2-1 )(P g +P yctp -G y2-1 )/(G y2 -G y2-1 )；
The water head w and the power P of the unit can be obtained by adopting the same method g +P yctp Corresponding opening Y w,pg+pyctp ＝D TABLE 2 ＝d Table y2-1 +(d Table y2 -d Table y2-1 )(P g -G y2-1 )/(G y2 -G y2-1 )。
Y is then yctp ＝Y w,pg+pyctp -Y w,pg 。
The control structure diagram for improving the primary frequency modulation performance of the hydropower station LCU opening analog segmentation open-loop control mode is shown in fig. 4, and mainly comprises a table lookup calculation 1 module 1, a cyclic self-adding module 2, a limiting 1 module 3, a cyclic self-subtracting module 4, a limiting 2 module 5, a selector module 6 and a table lookup calculation 2 module 7.
Table look-up calculation 1 Module 1 collects 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 1 module 3 and the clipping 2 module 5.
Circulation self-adding module 2 monitoring D Watch (watch) Varying and |D Watch (watch) -d|ΣΔd1 enable signal and collecting the vane opening signal D. When the enable signal is initially operated, 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 1 module 3.
The limiting 1 module 3 collects and looks up the D output by the table searching 1 module 1 Watch (watch) And D outputted by the cyclic self-adding module 2 Control of For D Control of To output the clipping, if k=1, the maximum value is K1D Watch (watch) If k= -1, the minimum value is K1D Watch (watch) . K1 is usually 1.4. Outputting a guide vane opening analog quantity control signal D Control of Channel 0 is given to the selector module 6.
Loop self-subtracting module 4 monitors |d Watch (watch) -D∣<And delta D1 is an enabling signal, and a guide vane opening signal D is acquired. The cyclic self-subtracting module 4 continuously outputs D Control of Cyclic self-subtracting k.DELTA.D, output D Control of To the clipping 2 block 5.
D outputted by the table look-up calculation 1 module 1 is collected by the amplitude limiting 2 module 5 Watch (watch) And D outputted from the subtraction module 4 Control of For D Control of To output the clipping, if k=1, the minimum value is D Watch (watch) If k= -1, the maximum value is D Watch (watch) . Outputting a guide vane opening analog quantity control signal D Control of Channel 1 is given to selector module 6.
Selector module 6 monitors |D Watch (watch) -D∣<Delta D1 selection signal, and collecting guide vane opening analog quantity control signal D output to selector module 6 by amplitude limiting 1 module 3 and amplitude limiting 2 module 5 Control of . When |D Watch (watch) -D∣<When Δd1 is not satisfied, the selector module 6 selects the channel 0 and outputs the vane opening analog control signal D to the selector module 6 from the limiter 1 module 3 Control of The method comprises the steps of carrying out a first treatment on the surface of the When |D Watch (watch) -D∣<When Δd1 is satisfied, the selector module 6 selects the channel 1, and outputs the vane opening analog control signal D to the selector module 6 from the limiter 2 module 5 Control of The method comprises the steps of carrying out a first treatment on the surface of the The selector module 6 outputs the guide vane opening analog control signal D Control of Output, and the primary frequency modulation opening target value Y calculated by the table look-up calculation 2 module 7 yctp After superposition, outputting a guide vane opening analog quantity control signal D' Control of To the governor electrical control system.
The table lookup calculation 2 module 7 calculates the power P of the unit g Primary frequency modulation power target value P yctp And the current unit water head w is used for checking a water head, the active power and the guide vane opening degree one-to-one correspondence data table, and calculating and outputting a primary frequency modulation opening degree target value Y yctp Superimposed to D output by selector module 6 Control of On, output guide vane aperture mouldAnalog control signal D' Control of To the governor electrical 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 (10)
1. A primary frequency modulation performance control method for realizing hydropower station LCU opening analog quantity subsection open-loop control is characterized by comprising the following steps:
s1, initializing control parameters delta D, delta D1, direction coefficient k and frequency dead zone E of a monitoring system f The limiting coefficient K1 and the data of a one-to-one correspondence table of the active power and the opening degree of the guide vane are initialized;
s2, the monitoring system collects the active power set value G Given n Guide vane opening feedback D, unit frequency f g Frequency is given f c A unit water head w;
s3, detecting whether the monitoring system is in an opening mode or not, if so, entering a step S4; otherwise, adopting non-opening mode control, and returning to the step S2;
s4, calculating a primary frequency modulation power target value P yctp ；
S5, calculating a given change value delta G of power Given a given ＝G Given n -G Given n-1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein G is Given n-1 Collecting an active power given value for an upper cycle period monitoring system;
s6, detecting delta G Given a given And P yctp Whether or not to be in the same direction, if so, G Given a given ＝G Given n Step S7 is entered; otherwise, directly entering step S7;
s7, P yctp Superimposed on G Given a given Power target value G Target object ＝G Given a given +P yctp ；
S8, the monitoring system monitors the target value G according to the power Target object And the current unit waterThe head w checks a head, the active power and the guide vane opening one-to-one correspondence data table, calculates a corresponding guide vane opening value D Watch (watch) ；
S9, detecting D by using monitoring system Watch (watch) Whether or not to become larger, if so, k=1, d Control of =d, proceed to step S11; otherwise, go to step S10;
s10, detecting D by using monitoring system Watch (watch) Whether or not to become smaller, if so, k= -1, d Control of =d, proceed to step S11; otherwise, directly entering step S11;
s11, detecting whether the monitoring system is |D Watch (watch) D is ∈D1, if D is ∈D1 Control of ＝D Control of +k represents DeltaD, deltaD is the step size of increasing and decreasing the control parameter, and the step S12 is entered; otherwise, D Control of ＝D Control of -k Δd, step S16;
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 >K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s14, detecting whether k= -1 by the monitoring system, if yes, entering a step S15; otherwise, go to step S20;
s15, detecting whether the monitoring system detects D Control of <K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s16, detecting whether k=1 by the monitoring system, if yes, entering a step S17; otherwise, go to step S18;
s17, detecting whether the monitoring system is D Control of <D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s18, detecting whether k= -1 or not by the monitoring system, if yes, entering a step S19; otherwise, go to step S20;
s19, detecting whether the monitoring system detects D Control of >D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s20, outputting a guide vane opening analog quantity control signal D by the monitoring system Control of N++, and returns to step S2.
2. The primary frequency modulation performance control method for realizing hydropower station LCU opening analog quantity segmented open-loop control according to claim 1, wherein in step S4, a primary frequency modulation power target value P is calculated yctp The method comprises the following steps:
if f c -f g >E f P is then yctp ＝(f c -f g -E f )/E p ；
If f c -f g <-E f P is then yctp ＝(f c -f g +E f )/E p ；
If |f c -f g |≤E f P is then yctp ＝0。
3. The primary frequency modulation performance control method for realizing hydropower station LCU opening analog quantity segmented open-loop control according to claim 1, wherein the step S8 is specifically as follows:
the data table of the one-to-one correspondence of the water head, the active power and the opening degree of the guide vane 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 )。
4. A primary frequency modulation performance control system for realizing hydropower station LCU opening analog quantity subsection open-loop control is characterized by comprising:
a table look-up calculation module for collecting the power target value G Target object 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) The method comprises the steps of feeding a limiting 1 module and a limiting 2 module;
a cyclic self-adding module for monitoring D Watch (watch) Varying and |D Watch (watch) -d|++Δd1 enable signal and collecting the vane opening signal D; when the enable signal is initially operated, 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 Giving the amplitude limiting 1 module;
the limiting 1 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 When k=1, the maximum value is K1×d, which is the clipping output Watch (watch) If k= -1, the minimum value is K1D Watch (watch) The method comprises the steps of carrying out a first treatment on the surface of the Outputting a guide vane opening analog quantity control signal D Control of Channel 0 to selector module 6;
a cyclic self-subtracting module for monitoring Watch (watch) -D∣<A delta D1 enabling signal and collecting a guide vane opening signal D; the cyclic self-subtracting module continuously pairs D Control of Cyclic self-subtracting k.DELTA.D, output D Control of Giving a limiting 2 module;
the limiting 2 module collects D output by the table look-up calculation module Watch (watch) And D output by the cyclic self-subtracting module Control of For D Control of A clipping output is performed for a minimum value D if k=1 Watch (watch) If k= -1, the maximum value is D Watch (watch) The method comprises the steps of carrying out a first treatment on the surface of the Outputting a guide vane opening analog quantity control signal D Control of Channel 1 to the selector module;
a selector module for monitoring Watch (watch) -D∣<Delta D1 selection signal, and collecting guide vane opening analog quantity control signal D output to selector module by amplitude limiting 1 module and amplitude limiting 2 module Control of The method comprises the steps of carrying out a first treatment on the surface of the When |D Watch (watch) -D∣<When DeltaD 1 is not satisfied, the selector module selects the channel 0 and outputs the analog quantity control signal D of the guide vane opening degree of the selector module to the amplitude limiting 1 module Control of The method comprises the steps of carrying out a first treatment on the surface of the When |D Watch (watch) -D∣<When DeltaD 1 is met, the selector module selects the channel 1, and outputs an analog quantity control signal D of the guide vane opening degree of the selector module to the amplitude limiting 2 module And (5) controlling. The method comprises the steps of carrying out a first treatment on the surface of the The selector 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.
5. A primary frequency modulation performance control method for improving hydropower station LCU opening analog quantity subsection open-loop control is characterized by comprising the following steps:
s1, initializing control parameters delta D, delta D1, direction coefficient k and frequency dead zone E of a monitoring system f Initializing table data of one-to-one correspondence between limiting coefficient K1 and active power and guide vane opening of an initializing water head;
s2, the monitoring system collects the active power set value G Given n Guide vane opening feedback D, unit frequency f g Frequency is given f c A unit water head w;
s3, detecting whether the monitoring system is in an opening mode or not, if so, entering a step S4; otherwise, adopting non-opening mode control, and returning to the step S2;
s4, calculating a primary frequency modulation power target value P yctp ；
S5, calculating a primary frequency modulation opening target value Y yctp ；
S6, calculating a given change value delta G of power Given a given ＝G Given n -G Given n-1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein G is Given a givenn-1 Collecting an active power given value for an upper cycle period monitoring system;
s7, detecting delta G Given a given And P yctp Whether or not to be in the same direction, if so, G Given a given ＝G Given n Step S8 is carried out; otherwise, directly entering step S8;
s8, the monitoring system gives 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) ；
S9, detecting D by using monitoring system Watch (watch) Whether or not to become larger, if so, k=1, d Control of =d, proceed to step S11; otherwise, go to step S10;
s10, detecting D by using monitoring system Watch (watch) Whether or not to become smaller, if so, k= -1, d Control of =d, proceed to step S11; otherwise, directly entering step S11;
s11, detecting whether the monitoring system is |D Watch (watch) D is ∈D1, if D is ∈D1 Control of ＝D Control of +k represents DeltaD, deltaD is the step size of increasing and decreasing the control parameter, and the step S12 is entered; otherwise, D Control of ＝D Control of -k Δd, step S16;
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 >K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s14, detecting whether k= -1 by the monitoring system, if yes, entering a step S15; otherwise, go to step S20;
s15, detecting whether the monitoring system detects D Control of <K1*D Watch (watch) If yes, D Control of ＝K1*D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s16, detecting whether k=1 by the monitoring system, if yes, entering a step S17; otherwise, go to step S18;
s17, detecting whether the monitoring system is D Control of <D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s18, detecting whether k= -1 or not by the monitoring system, if yes, entering a step S19; otherwise, go to step S20;
s19, detecting whether the monitoring system detects D Control of >D Watch (watch) If yes, D Control of ＝D Watch (watch) Step S20 is performed; otherwise, directly enter step S20;
s20, calculating D' Control of ＝D Control of +Y yctp ；
S21, the monitoring system outputs a guide vane opening analog quantity control signal D' Control of N++, returning to the step S2.
6. The primary frequency modulation performance control method for improving hydropower station LCU opening analog quantity segmented open-loop control according to claim 5, wherein in step S1, the one-to-one correspondence table of the water head, active power and guide vane opening is as follows:
in the above table, p, q, x, x, x2, y1 and y2 are positive integers, x is more than 1 and less than or equal to p, y is more than 1 and less than or equal to q, D x,y Is W x Water head G y And the opening degree of the guide vane corresponding to the active power.
7. The primary frequency modulation performance control method for improving hydropower station LCU opening analog quantity segmented open-loop control according to claim 5, wherein in step S4, a primary frequency modulation power target value P is calculated yctp The method comprises the following steps:
if f c -f g >E f P is then yctp ＝(f c -f g -E f )/E p ；
If f c -f g <-E f P is then yctp ＝(f c -f g +E f )/E p ；
If |f c -f g |≤E f P is then yctp ＝0。
8. The method for controlling primary frequency modulation performance by increasing hydropower station LCU opening analog quantity segmented open-loop control according to claim 6, wherein in step S5, a primary frequency modulation opening target value Y is calculated yctp The method comprises the following steps:
if W is x1-1 ≤w≤W x1 ，G y1-1 ≤P g ≤G y1 Then:
d TABLE y1-1 ＝D x1-1，y1-1 +(D x1，y1-1 -D x1-1，y1-1 )(w-W x1-1 )/(W x1 -W x1-1 )；
d Table y1 ＝D x1-1，y1 +(D x1，y1 -D x1-1，y1 )(w-W x1-1 )/(W x1 -W x1-1 )；
D TABLE 1 ＝d TABLE y1-1 +(d Table y1 -d TABLE y1-1 )(P g -G y1-1 )/(G y1 -G y1-1 )；
The water head w and the power P of the unit can be obtained g Corresponding opening Y w,pg ＝D TABLE 1 ＝d Table y-1 +(d Table y -d Table y-1 )(P g -G y-1 )/(G y -G y-1 )；
If W is x2-1 ≤w≤W x2 ，G y2-1 ≤P g +P yctp ≤G y2 Then:
d table y2-1 ＝D x2-1，y2-1 +(D x2，y2-1 -D x2-1，y2-1 )(w-W x2-1 )/(W x2 -W x2-1 )；
d Table y2 ＝D x2-1，y2 +(D x2，y2 -D x2-1，y2 )(w-W x2-1 )/(W x2 -W x2-1 )；
D TABLE 2 ＝d Table y2-1 +(d Table y2 -d Table y2-1 )(P g +P yctp -G y2-1 )/(G y2 -G y2-1 )；
The water head w and the power P of the unit can be obtained by the same method g +P yctp Corresponding opening Y w,pg+pyctp ＝D TABLE 2 ＝d Table y2-1 +(d Table y2 -d Table y2-1 )(P g -G y2-1 )/(G y2 -G y2-1 )；
Y is then yctp ＝Y w,pg+pyctp -Y w,pg 。
9. The primary frequency modulation performance control method for improving hydropower station LCU opening analog quantity segmented open-loop control according to claim 6, wherein in step S8, a corresponding guide vane opening value D is calculated Watch (watch) The method comprises the following steps:
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 )。
10. Primary frequency modulation performance control system for improving hydropower station LCU opening analog quantity subsection open-loop control, which is characterized by comprising:
table lookup calculation 1 module for collecting 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) The method comprises the steps of feeding a limiting 1 module and a limiting 2 module;
a cyclic self-adding module for monitoring D Watch (watch) Varied and is provided with∣D Watch (watch) -d|++Δd1 enable signal and collecting the vane opening signal D; when the enable signal is initially operated, 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 Giving the amplitude limiting 1 module;
the limiting 1 module is used for collecting D output by the table look-up calculation 1 module Watch (watch) And D output by the cyclic self-adding module Control of For D Control of To output the clipping, if k=1, the maximum value is K1D Watch (watch) If k= -1, the minimum value is K1D Watch (watch) The method comprises the steps of carrying out a first treatment on the surface of the Outputting a guide vane opening analog quantity control signal D Control of Channel 0 to the selector module;
a cyclic self-subtracting module for monitoring Watch (watch) -D∣<A delta D1 enabling signal and collecting a guide vane opening signal D; the cyclic self-subtracting module continuously pairs D Control of Cyclic self-subtracting k.DELTA.D, output D Control of Giving a limiting 2 module;
the limiting 2 module is used for collecting D output by the table look-up calculation 1 module Watch (watch) And D output by the cyclic self-subtracting module Control of For D Control of To output the clipping, if k=1, the minimum value is D Watch (watch) If k= -1, the maximum value is D Watch (watch) The method comprises the steps of carrying out a first treatment on the surface of the Outputting a guide vane opening analog quantity control signal D Control of Channel 1 to the selector module;
a selector module for monitoring Watch (watch) -D∣<Delta D1 selection signal, and collecting guide vane opening analog quantity control signal D output to selector module by amplitude limiting 1 module and amplitude limiting 2 module Control of The method comprises the steps of carrying out a first treatment on the surface of the When |D Watch (watch) -D∣<When DeltaD 1 is not satisfied, the selector module selects the channel 0 and outputs the analog quantity control signal D of the guide vane opening degree of the selector module to the amplitude limiting 1 module Control of The method comprises the steps of carrying out a first treatment on the surface of the When |D Watch (watch) -D∣<When DeltaD 1 is met, the selector module selects the channel 1, and outputs an analog quantity control signal D of the guide vane opening degree of the selector module to the amplitude limiting 2 module Control of The method comprises the steps of carrying out a first treatment on the surface of the The selector module controls the analog quantity of the opening degree of the guide vane to be D Control of Outputting the primary frequency modulation opening target value Y calculated by a table look-up calculation 2 module yctp After superposition, outputting a guide vane opening analog quantity control signal D' Control of Giving an electric control system of the speed regulator;
table lookup calculation 2 module for calculating power P according to unit g Primary frequency modulation power target value P yctp And the current unit water head w is used for checking a water head, the active power and the guide vane opening degree one-to-one correspondence data table, and calculating and outputting a primary frequency modulation opening degree target value Y yctp Superimposed to D output by selector module 6 Control of On, output the analog quantity control signal D 'of the opening degree of the guide vane' Control of To the governor electrical control system.
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