CN114396353B - Water turbine speed regulator power oscillation judging method and system - Google Patents
Water turbine speed regulator power oscillation judging method and system Download PDFInfo
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- CN114396353B CN114396353B CN202111557105.3A CN202111557105A CN114396353B CN 114396353 B CN114396353 B CN 114396353B CN 202111557105 A CN202111557105 A CN 202111557105A CN 114396353 B CN114396353 B CN 114396353B
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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
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/008—Measuring or testing arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/80—Diagnostics
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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
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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 application relates to a method and a system for judging power oscillation of a water turbine governor, wherein the method comprises the following steps of calculating or acquiring the following parameters: and when the conditions are met, the power oscillation alarm of the unit is generated by the oscillation of the power system or the power oscillation alarm of the unit is generated by the oscillation of the speed regulator system. The application can automatically and accurately judge the oscillation source, and does not need to manually carry out statistical analysis; the unit generated power oscillation speed regulator can automatically perform emergency treatment, and human intervention is not needed any more; the precision of the given power, the power feedback and the participation control of the valve core displacement of the main distributing valve of the speed regulator is increased; the accuracy of judging the power oscillation of the unit is improved.
Description
Technical Field
The application relates to the field of hydropower station speed regulator control systems, in particular to a method and a system for judging power oscillation of a water turbine speed regulator.
Background
The speed regulator of the water turbine is an important automatic regulating device of the water turbine, and the speed regulator of the water turbine has the function of controlling the opening degree of guide vanes of the water turbine so as to control the flow rate of the water turbine, and keeping the rated rotation speed of the water turbine at 100 percent unchanged, namely keeping the frequency of a unit at 50Hz unchanged.
At present, a monitoring system and a PMU (power management unit) are generally adopted for judging unit power oscillation in the hydropower industry to perform artificial analysis and comprehensive judgment, and a speed regulator of a water-free turbine is directly used for judging. The following problems exist:
1. whether the power system causes power oscillation of the unit or the speed regulator system causes power oscillation of the unit cannot be automatically judged, namely an oscillation source cannot be automatically judged;
2. if the speed regulator system causes power oscillation of the unit due to a certain reason, the speed regulator is not designed with power oscillation judgment logic, so that the power oscillation judgment of the unit cannot be carried out, and emergency treatment cannot be automatically carried out;
3. whether the power system causes the unit to generate power oscillation or the speed regulator system causes the unit to generate power oscillation, the data searching, the data collecting and the analysis and judgment are needed to be manually carried out, so that the oscillation reason cannot be quickly and accurately judged, the accident handling is not facilitated, and meanwhile, the workload of maintenance personnel is increased.
If the unit generates power oscillation, if the oscillation source cannot be timely and accurately judged, the optimal treatment time is easily missed, even the accident treatment time is delayed, the accident expansion can be caused, the safety and stable operation of the water-turbine generator set and the power grid are seriously threatened, and particularly, the unit participating in peak regulation and frequency modulation can cause more serious threat to the power grid.
Disclosure of Invention
In order to solve the problems, the application provides a method and a system for judging power oscillation of a water turbine speed regulator.
The technical scheme of the application is as follows:
a method for judging power oscillation of a water turbine governor comprises the following steps:
the following parameters are calculated or obtained: the speed regulator power is given Pc, the speed regulator power feedback Pg, the speed regulator main distributing valve core displacement S and the speed regulator power dead zone Pgif, and the speed regulator power dead zone Pgif is artificially set according to the operating characteristics of the system for many years.
Meanwhile, when the following conditions are met, the power oscillation alarm of the unit is caused by the oscillation of the power system (given by the power of the speed regulator):
in the time t period, the continuous fluctuation frequency of the given waveform of the power of the speed regulator is prior to the power feedback, the power dead zone Pgif is unchanged, the frequency of the I Pg-Pc I > Pgif is more than or equal to 2n times, the wave crest of the displacement S waveform of the main pressure distribution valve of the speed regulator is more than or equal to n times, and the wave trough of the displacement S waveform of the main pressure distribution valve of the speed regulator is more than or equal to n times;
meanwhile, when the following conditions are met, the power oscillation alarm of the unit is caused by the oscillation of a speed regulator system (speed regulator power feedback):
in the time t period, the power of the speed regulator is set to be basically Pc, the power dead zone Pgif is not changed, the number of times that Pg-Pc is larger than Pgif is larger than or equal to 2n, the wave crest of the valve core displacement S waveform of the main pressure distribution valve of the speed regulator is larger than or equal to n times, and the wave trough of the valve core displacement S waveform of the main pressure distribution valve of the speed regulator is larger than or equal to n times.
Further, the governor power given Pc is directly obtained or derived from the following calculation process:
the given signal of the power sent to the speed regulator is Ic; correspondingly calibrating 4-20 mA as a calculated code value range beta min-beta max; the governor power is calculated as follows given an intermediate variable β:
β＝[(βmax-βmin)*(Ic-4)/(20-4)]+βmin；
correspondingly calibrating the calculated code value ranges beta min-beta max as the given ranges Pcmin-Pcmax of the power of the speed regulator;
the governor power setting is calculated as follows:
Pc＝[(Pcmax-Pcmin)*(β-βmin)/(βmax-βmin)]+Pcmin。
further, the governor power feedback Pg is directly obtained or obtained by the following calculation process:
obtaining a current signal Ig from a speed regulator power transmitter;
correspondingly calibrating 4-20 mA as a calculated code value range alpha min-alpha max;
calculating a speed regulator power sampling intermediate variable:
α＝[(αmax-αmin)*(Ig-4)/(20-4)]+αmin；
correspondingly calibrating the calculated code value ranges alpha min-alpha max as the speed regulator power sampling ranges Pgmin-Pgmax;
calculating the power of the speed regulator:
Pg＝[(Pgmax-Pgmin)*(α-αmin)/(αmax-αmin)]+Pgmin。
further, the valve core displacement of the main pressure distribution valve of the speed regulator is directly obtained or obtained by the following calculation process:
acquiring a current signal Is through a valve core displacement sensor of a main distributing valve;
correspondingly calibrating 4-20 mA as a calculated code value range theta min-theta max;
calculating a valve core displacement intermediate variable of a main pressure distribution valve of the speed regulator:
θ＝[(θmax-θmin)*(Is-4)/(20-4)]+θmin；
correspondingly calibrating the calculated code value ranges theta min-theta max as valve core displacement ranges Smin-Smax of the main distributing valve of the speed regulator;
calculating the valve core displacement of the main pressure distribution valve of the speed regulator:
S＝[(Smax-Smin)*(θ-θmin)/(θmax-θmin)]+Smin。
the application also relates to a power oscillation judging system of the water turbine speed regulator, which comprises a collector and a processor, wherein the collector collects information, the processor carries out correction compensation calculation according to the collected information and judges an oscillation source according to a calculation result.
Further, the system also comprises a plurality of alarms which are arranged on different oscillation sources, and the alarms send out alarms according to the judging result of the processor.
The application also relates to an electronic device comprising a memory, a processor and a computer program on the memory and executable on the processor, which processor implements the steps of the above method when executing the computer program.
The application also relates to a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method as described above.
Compared with the prior art, the application has the following beneficial effects:
1. the application can automatically and accurately judge the oscillation source, and does not need to manually carry out statistical analysis.
The power of the speed regulator is given to continuously fluctuate firstly, and after power feedback, the continuous fluctuation is started, the valve core displacement change of the main distributing valve is synchronous with the power feedback, and the power oscillation of the unit caused by the oscillation of the power system (the given power of the speed regulator) can be judged.
The power setting of the speed regulator is basically unchanged, the power dead zone Pgif is unchanged, the power feedback continuously fluctuates, and the valve core displacement change of the main pressure distribution valve is synchronous with the power feedback, so that the power oscillation of the unit caused by the oscillation of the speed regulator system (the power feedback of the speed regulator) can be judged.
2. The unit generation power oscillation speed regulator can automatically perform emergency treatment, and human intervention is not needed any more.
When the power system (given by the power of the speed regulator) oscillates and the speed regulator system (fed back by the power of the speed regulator) oscillates to cause the power oscillation of the unit, the speed regulator gives an alarm, and meanwhile, the speed regulator can automatically switch the control mode into manual control.
3. The application increases the precision of the given power, the power feedback and the participation control of the valve core displacement of the main distributing valve of the speed regulator.
The adjustment and calculation code value (intermediate variable) is reasonably adjusted, so that correction and compensation are carried out on the given power of the speed regulator, the power feedback and the valve core displacement of the main pressure distribution valve, and the correction and compensation are used for compensating the change caused by errors in the measuring source and the signal transmission process, thereby increasing the accuracy of participation in control.
4. The variable is reasonably quoted in the design of the unit power oscillation logic, so that the accuracy of judging the unit power oscillation is improved.
By means of the relation among the given power, the power feedback and the valve core displacement of the main pressure distribution valve of the speed regulator, the given power, the power feedback and the valve core displacement of the main pressure distribution valve of the speed regulator are cited in the power oscillation logic design of the unit, and the accuracy of judging the power oscillation of the unit is improved.
Drawings
FIG. 1 is a block diagram of a system of the present application;
fig. 2 is a power conditioning logic block diagram of the present application.
Detailed Description
The following description of the embodiments will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. Based on the embodiments, all other embodiments that may be obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present application.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art. The terms "first," "second," and the like, as used in this embodiment, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. "upper", "lower", "left", "right", "transverse", and "vertical", etc. are used only with respect to the orientation of the components in the drawings, these directional terms are relative terms, which are used for descriptive and clarity with respect thereto and which may vary accordingly with respect to the orientation in which the components are disposed in the drawings.
As shown in fig. 1, the system for judging power oscillation of a water turbine governor in this embodiment includes a collector, a processor, an alarm 1 and an alarm 2, the collector collects information, the processor performs correction compensation calculation according to the collected information, and judges an oscillation source according to a calculation result.
The alarm 1 and the alarm 2 are arranged on different oscillation sources, and the alarm gives an alarm according to the judgment result of the processor.
The method for judging the power oscillation of the water turbine governor of the embodiment comprises the following steps:
1. speed regulator power sampling, power setting and main pressure distribution valve spool displacement calculation:
1. and (3) speed regulator power sampling calculation:
(1) And calculating the intermediate variable of the power sampling of the speed regulator.
1) Obtaining a current signal Ig from a speed regulator power transmitter;
2) Correspondingly calibrating 4-20 mA (current signal) as a range alpha min-alpha max of a calculated code value (intermediate variable);
3) The speed regulator power sampling intermediate variable calculation formula:
α＝[(αmax-αmin)*(Ig-4)/(20-4)]+αmin。
(2) And (5) calculating the power sampling of the speed regulator.
1) Correspondingly calibrating the calculated code value ranges alpha min-alpha max as the speed regulator power sampling ranges Pgmin-Pgmax;
2) The speed regulator power sampling calculation formula:
Pg＝[(Pgmax-Pgmin)*(α-αmin)/(αmax-αmin)]+Pgmin。
(3) Speed regulator power sampling compensation
For the hydroelectric generating set, the installed capacity of the hydroelectric generating set is set in factory, so that the speed power sampling ranges Pgmin-Pgmax are not adjustable. 4-20 mA is the standard value of a non-current signal conversion current signal, namely the international general standard, and cannot be modified. By combining the calculation formulas, the power sampling Pg of the speed regulator is corrected and compensated by reasonably adjusting the sizes of the intermediate variables alpha min and alpha max, so as to compensate the change caused by errors in the measuring source and the signal transmission process.
2. Speed governor power given calculation:
(1) The governor power is calculated given an intermediate variable.
1) The monitoring system gives Ic to the power given signal of the speed regulator;
2) Correspondingly calibrating 4-20 mA (current signal) as a range beta min-beta max of a calculated code value (intermediate variable);
3) The power of the speed regulator is given by an intermediate variable calculation formula:
β＝[(βmax-βmin)*(Ic-4)/(20-4)]+βmin。
(2) The governor power is given to the calculation.
1) Correspondingly calibrating the calculated code value ranges beta min-beta max as the given ranges Pcmin-Pcmax of the power of the speed regulator;
2) The power of the speed regulator is given by a calculation formula:
Pc＝[(Pcmax-Pcmin)*(β-βmin)/(βmax-βmin)]+Pcmin。
(3) The governor power gives compensation.
For the hydroelectric generating set, the installed capacity of the hydroelectric generating set is set after leaving the factory, so that the given range of the power of the speed set, namely, the power of the hydroelectric generating set, namely, the power of the speed set, namely, the speed set. 4-20 mA is the standard value of a non-current signal conversion current signal, namely the international general standard, and cannot be modified. By combining the calculation formulas, the adjustment intermediate variables beta min and beta max are reasonably adjusted, and the given Pc of the power of the speed regulator is corrected and compensated, so that the change caused by errors in the measuring source and the signal transmission process is compensated.
3. Valve core displacement calculation of main pressure distribution valve of speed regulator
(1) Valve core displacement intermediate variable calculation of main pressure distribution valve of speed regulator
1) Acquiring a current signal Is through a valve core displacement sensor of a main distributing valve;
2) Correspondingly calibrating 4-20 mA (current signal) as a range of calculated code values (intermediate variables) theta min-theta max;
3) The valve core displacement intermediate variable calculation formula of the main pressure distribution valve of the speed regulator comprises the following steps:
θ＝[(θmax-θmin)*(Is-4)/(20-4)]+θmin
(2) Valve core displacement calculation of main pressure distribution valve of speed regulator
1) Correspondingly calibrating the calculated code value ranges theta min-theta max as valve core displacement ranges Smin-Smax of the main distributing valve of the speed regulator;
2) Valve core displacement calculation formula of main distributing valve of speed regulator:
S＝[(Smax-Smin)*(θ-θmin)/(θmax-θmin)]+Smin
(3) Valve core displacement compensation of main pressure distribution valve of speed regulator
For the main distributing valve of the speed regulator, the valve core is fully opened and the fully closed position is set by factory, so the valve core is not adjustable. 4-20 mA is the standard value of a non-current signal conversion current signal, namely the international general standard, and cannot be modified. By combining the calculation formulas, the valve core displacement S of the main pressure distribution valve of the speed regulator is corrected and compensated by reasonably adjusting the sizes of the intermediate variables θmin and θmax, so as to compensate the change caused by errors in the measuring source and signal transmission process.
2. And (3) judging unit power oscillation:
(1) Judging power oscillation variable
The power of the speed regulator is given Pc, the power of the speed regulator is fed back Pg, the valve core displacement S of the main pressure distribution valve of the speed regulator and the power dead zone Pgif of the speed regulator.
(2) The power adjustment logic is shown in fig. 2, where the power feedback Pg tracks the power given Pc in closed loop control mode.
(3) Oscillation of a power system (given by power of a speed regulator) causes power oscillation of a unit
The power oscillation phenomenon of the unit caused by the oscillation of the power system (given by the power of the speed regulator) is that the continuous fluctuation frequency of the given waveform of the power of the speed regulator is earlier than the power feedback, and the valve core displacement change of the main distributing valve is always synchronous with the waveform change of the power feedback. The judgment is carried out according to the following table:
TABLE 1
(4) The oscillation of the speed regulator system (speed regulator power feedback) causes the unit to generate power oscillation
The power oscillation phenomenon of the unit caused by the oscillation of a speed regulator system (speed regulator power feedback) is that the given power of the speed regulator is basically unchanged, the power dead zone Pgif is unchanged, the power feedback waveform of the speed regulator continuously fluctuates, and the valve core displacement change of the main pressure distributing valve is always synchronous with the power feedback waveform change. The judgment is carried out according to the following table:
TABLE 2
According to the embodiment, by means of the relation among power sampling, power setting and valve core displacement of the main pressure distribution valve of the speed regulator, through researching the unit power oscillation phenomenon and combining the regulation characteristics of the speed regulator of the water turbine, the method for judging the unit power oscillation of the speed regulator is designed, an oscillation source can be automatically and accurately judged, an alarm is given, and meanwhile, the speed regulator automatically performs emergency treatment without human intervention. And correcting and compensating the given power of the speed regulator, the power feedback and the valve core displacement of the main distributing valve by reasonably adjusting the calculated code value (intermediate variable). The precision and the accuracy of the given power, the power feedback and the participation control of the valve core position of the main distributing valve of the speed regulator are increased. The threat to equipment and a power grid caused by unit power oscillation is effectively avoided, the automation level of the equipment is effectively improved, the workload of maintenance personnel is reduced, and meanwhile, the gap that the water turbine speed regulator in the hydropower industry directly judges the unit power oscillation is filled.
As a specific example:
the system of the present embodiment performs the following calculation based on the acquired data:
1. and (3) speed regulator power sampling calculation:
αmin=9887, αmax= 29369, α=19636, pgmin= -700WM, pgmax=700 WM: calculating a speed regulator power sample Pg:
Pg＝{[(700-(-700)]*(19639-9887)/(29369-9887)}+(-700)WM＝0.79WM。
2. speed governor power given calculation:
βmin=6570, βmax= 24903, β= 6554, pcmin=0wm, pcmax=700 WM: calculating a given Pc of the power of the speed regulator:
Pc＝[(700-0)*(6554-6570)/(24903-6570)]+0WM＝-0.61WM。
3. calculating the valve core displacement of the main pressure distribution valve of the speed regulator:
θmin=14400, θmax= 23106, θ= 19054, smin=0 mm, smax=63.7 mm: calculating the valve core displacement S of the main pressure distribution valve of the speed regulator:
S＝[(63.7-0)*(19054-14400)/(23106-14400)]+0mm＝34.05mm。
4. the power system (given by the power of the speed regulator) oscillation causes the unit to generate power oscillation analysis:
the governor power given Pc jumps between 590WM and 600WM, the governor power dead zone pgif=5wm, time t=0.5 s, number 2n=4, and the test analysis of the power system (governor power given) oscillations causes the unit to oscillate in power:
a) When pc=600 WM and pg=590 WM, |pg-pc| > Pgif, exceeding the power dead zone 5WM, the unit starts to self-regulate to increase the power feedback Pg of the speed regulator until |pg-pc| < Pgif, the unit stops self-regulating, and the number of times of the |pg-pc| > Pgif is counted 1 time, namely 2 n=1, and the peak count of the valve core displacement S of the main distributing valve of the speed regulator is 1 time, namely n=0.5 because of forward regulation;
b) When pc=590 WM and pg=600 WM, |pg-pc| > Pgif, exceeding the power dead zone 5WM, the unit starts self-adjustment to reduce the power feedback Pg of the speed regulator until |pg-pc| < Pgif, the unit stops self-adjustment, and the number of times of |pg-pc| > Pgif is counted 2 times, namely 2 n=2, and the valve core displacement S of the main distributing valve of the speed regulator is counted 1 times, namely n=0.5, due to negative adjustment;
c) When pc=600 WM and pg=590 WM, |pg-pc| > Pgif, exceeding the power dead zone 5WM, the unit starts to self-regulate to increase the power feedback Pg of the speed regulator until |pg-pc| < Pgif, the unit stops self-regulating, and the number of times of the |pg-pc| > Pgif is counted for 3 times, namely 2 n=3, and the valve core displacement S of the main distributing valve of the speed regulator is counted for 2 times, namely n=1 because of forward regulation;
d) When pc=590 WM and pg=600 WM, |pg-pc| > Pgif, exceeding the power dead zone 5WM, the unit starts self-regulating to reduce the governor power feedback Pg until |pg-pc| < Pgif, the unit stops self-regulating, and at this time |pg-pc| > Pgif count 4 times, i.e. 2n=4, the governor main distributing valve spool displacement S occurs 2 times, i.e. n=1, due to negative regulation.
5. The oscillation of the speed regulator system (speed regulator power feedback) causes the unit to generate power oscillation analysis:
given a governor power pc=600 WM, the governor power feedback Pg jumps between 590WM to 610WM, the governor power dead zone pgif=5 WM, time t=0.5 s, number of times 2n=4, and the test analysis governor system (governor power feedback) oscillations cause the unit to oscillate in power:
a) When pg=590 WM, |pg-pc| > Pgif, exceeding the power dead zone 5WM, the unit starts to self-regulate so as to increase the power feedback Pg of the speed regulator until |pg-pc| < Pgif, the unit stops self-regulating, and the number of times of counting is 1 time when |pg-pc| > Pgif, namely 2 n=1, and the valve core displacement S of the main distributing valve of the speed regulator is counted 1 time when the trough is counted because of forward regulation, namely n=0.5;
b) When pg=610 WM, |pg-pc| > Pgif, exceeding the power dead zone 5WM, the unit starts self-adjustment to reduce the power feedback Pg of the speed regulator until |pg-pc| < Pgif, the unit stops self-adjustment, and the number of times of counting is 2 times when |pg-pc| > Pgif, namely 2 n=2, and the peak count is 1 time when the valve core displacement S of the main distributing valve of the speed regulator occurs due to negative adjustment, namely n=0.5;
c) When pg=590 WM, |pg-pc| > Pgif, exceeding the power dead zone 5WM, the unit starts to self-regulate so as to increase the power feedback Pg of the speed regulator until |pg-pc| < Pgif, the unit stops self-regulating, and the number of times of counting is 3 times when |pg-pc| > Pgif, namely 2 n=3, and the valve core displacement S of the main distributing valve of the speed regulator is counted 2 times in the trough because of forward regulation, namely n=1;
d) When pg=610 WM, |pg-pc| > Pgif, exceeding the power dead zone 5WM, the unit starts self-adjustment to reduce the power feedback Pg of the speed regulator until |pg-pc| < Pgif, the unit stops self-adjustment, and the number of times of the |pg-pc| > Pgif is counted for 4 times, namely 2n=4, and the peak count occurs for 2 times, namely n=1, of the valve core displacement S of the main distributing valve of the speed regulator due to negative adjustment.
It should be noted that, it should be understood that the division of the modules of the above apparatus is merely a division of a logic function, and may be fully or partially integrated into a physical entity or may be physically separated. And these modules may all be implemented in software in the form of calls by the processing element; or can be realized in hardware; the method can also be realized in a form of calling software by a processing element, and the method can be realized in a form of hardware by a part of modules.
The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in a software form.
For example, the modules above may be one or more integrated circuits configured to implement the methods above, such as: one or more specific integrated circuits (Application specific integrated circuit, ASIC), or one or more microprocessors (Digital signal processor, DSP), or one or more field programmable gate arrays (Field programmable gate array, FPGA), or the like. For another example, when a module above is implemented in the form of a processing element scheduler code, the processing element may be a general purpose processor, such as a central processing unit (Centralprocessing unit, CPU) or other processor that may invoke the program code. For another example, the modules may be integrated together and implemented in the form of a System-on-a-chip (SOC). In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a readable storage medium or transmitted from one readable storage medium to another readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.
The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also Digital signal processors (Digital SignalProcessing, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
Optionally, an embodiment of the present application further provides a storage medium, where instructions are stored, when running on a computer, to cause the computer to perform the method of the embodiment as described above.
Optionally, the embodiment of the present application further provides a chip for executing the instruction, where the chip is used to execute the method of the embodiment shown above.
An embodiment of the present application also provides a program product, which includes a computer program stored in a storage medium, from which at least one processor can read the computer program, and the at least one processor can implement the method of the above embodiment when executing the computer program.
In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the front and rear associated objects are an "or" relationship; in the formula, the character "/" indicates that the front and rear associated objects are a "division" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.
It will be appreciated that the various numerical numbers referred to in the embodiments of the present application are merely for ease of description and are not intended to limit the scope of the embodiments of the present application.
It should be understood that, in the embodiment of the present application, the sequence number of each process does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
Claims (8)
1. A method for judging power oscillation of a water turbine governor is characterized by comprising the following steps of: the method comprises the following steps:
the following parameters are calculated or obtained: setting Pc, pg, S and Pgif of the power of the speed regulator;
meanwhile, when the following conditions are met, the power system oscillation causes the unit to generate power oscillation alarm:
in the time t period, the continuous fluctuation frequency of the given waveform of the power of the speed regulator is prior to the power feedback, the power dead zone Pgif is unchanged, the frequency of the I Pg-Pc I > Pgif is more than or equal to 2n times, the wave crest of the displacement S waveform of the main pressure distribution valve of the speed regulator is more than or equal to n times, and the wave trough of the displacement S waveform of the main pressure distribution valve of the speed regulator is more than or equal to n times;
meanwhile, when the following conditions are met, the power oscillation alarm of the unit is caused by the oscillation of the speed regulator system:
in the time t period, the power of the speed regulator is set to be basically Pc, the power dead zone Pgif is not changed, the number of times that Pg-Pc is larger than Pgif is larger than or equal to 2n, the wave crest of the valve core displacement S waveform of the main pressure distribution valve of the speed regulator is larger than or equal to n times, and the wave trough of the valve core displacement S waveform of the main pressure distribution valve of the speed regulator is larger than or equal to n times.
2. The method according to claim 1, characterized in that: the given Pc of the speed regulator power is directly obtained or obtained by the following calculation process:
the given signal of the power sent to the speed regulator is Ic; correspondingly calibrating 4-20 mA as a calculated code value range beta min-beta max; the governor power is calculated as follows given an intermediate variable β:
β＝[(βmax-βmin)*(Ic-4)/(20-4)]+βmin；
correspondingly calibrating the calculated code value ranges beta min-beta max as the given ranges Pcmin-Pcmax of the power of the speed regulator;
the governor power setting is calculated as follows:
Pc＝[(Pcmax-Pcmin)*(β-βmin)/(βmax-βmin)]+Pcmin。
3. the method according to claim 1, characterized in that: the speed regulator power feedback Pg is directly obtained or obtained by the following calculation process:
obtaining a current signal Ig from a speed regulator power transmitter;
correspondingly calibrating 4-20 mA as a calculated code value range alpha min-alpha max;
calculating a speed regulator power sampling intermediate variable:
α＝[(αmax-αmin)*(Ig-4)/(20-4)]+αmin；
correspondingly calibrating the calculated code value ranges alpha min-alpha max as the speed regulator power sampling ranges Pgmin-Pgmax;
calculating the power of the speed regulator:
Pg＝[(Pgmax-Pgmin)*(α-αmin)/(αmax-αmin)]+Pgmin。
4. the method according to claim 1, characterized in that: the valve core displacement of the main pressure distribution valve of the speed regulator is directly obtained or obtained by the following calculation process:
acquiring a current signal Is through a valve core displacement sensor of a main distributing valve;
correspondingly calibrating 4-20 mA as a calculated code value range theta min-theta max;
calculating a valve core displacement intermediate variable of a main pressure distribution valve of the speed regulator:
θ＝[(θmax-θmin)*(Is-4)/(20-4)]+θmin；
correspondingly calibrating the calculated code value ranges theta min-theta max as valve core displacement ranges Smin-Smax of the main distributing valve of the speed regulator;
calculating the valve core displacement of the main pressure distribution valve of the speed regulator:
S＝[(Smax-Smin)*(θ-θmin)/(θmax-θmin)]+Smin。
5. a water turbine speed regulator power oscillation judging system is characterized in that: the method comprises the steps of collecting information by the collector and the processor, carrying out correction compensation calculation according to the method of any one of claims 1-4 by the processor according to the collected information, and judging an oscillation source according to a calculation result.
6. The system according to claim 5, wherein: the system also comprises a plurality of alarms which are arranged on different oscillation sources, and the alarms send out alarms according to the judgment result of the processor.
7. An electronic device comprising a memory, a processor, and a computer program on the memory and executable on the processor, characterized by: the processor, when executing the computer program, implements the steps of the method of any of the preceding claims 1 to 4.
8. A non-transitory computer readable storage medium having a computer program stored thereon, characterized by: which computer program, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
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