CN109404213B - Adaptive variable parameter method for power mode of hydroelectric generating set - Google Patents
Adaptive variable parameter method for power mode of hydroelectric generating set Download PDFInfo
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- CN109404213B CN109404213B CN201811310880.7A CN201811310880A CN109404213B CN 109404213 B CN109404213 B CN 109404213B CN 201811310880 A CN201811310880 A CN 201811310880A CN 109404213 B CN109404213 B CN 109404213B
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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
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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
- F05B2270/00—Control
- F05B2270/70—Type of control algorithm
- F05B2270/706—Type of control algorithm proportional-integral-differential
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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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Abstract
The invention discloses a hydropower unit power mode adaptive variable parameter method, which comprises the following steps: 1) sampling the water level of an upstream reservoir and the tail water level of a downstream power station in real time, and dividing a water head section according to the difference value of the water level of the upstream reservoir and the tail water level of the downstream power station; 2) each divided water head section corresponds to a group of PID parameters, real-time updating is not needed, and the PID parameters are kept unchanged when the next water head enters in the load adjusting process; 3) selecting PID parameters through multiple field tests according to the division condition of the water head section, and selecting a group of parameters which are stably regulated as the PID parameters; 4) according to the division of the water head section, the intermediate value +/-0.5 m of the water head section is selected as a test water head, and finally the selected parameter is used as a PID (proportion integration differentiation) adjusting parameter of the water head section, so that the problems that the same group of adjusting parameters cannot adapt to the change of an operating water head in a power mode, when a unit operates in a non-test water head, the parameter adaptability is poor, and the response time, the adjusting rate and the adjusting stability do not meet requirements are solved.
Description
Technical Field
The invention relates to the technical field of hydroelectric power generation, in particular to a method for adaptively changing parameters of a hydroelectric generating set in a power mode.
Background
Most hydroelectric generating sets in China operate in an opening mode, in recent years, some hydroelectric generating sets start to operate in a power mode, and the fact that the adaptability of the power mode to parameters is still to be optimized due to the nonlinearity of the hydroelectric generating sets during operation is found, particularly for the hydroelectric generating sets with large operating head changes.
When the hydroelectric generating set operates in a power mode, the on-site test shows that: under different water heads, the adjusting performance of the unit is greatly different for the same group of PID parameters, and the selection and control strategy of the PID parameters needs to consider the adaptability of various working conditions. For example, when the parameters are good when the water head is low, the problems of overshoot, large fluctuation, long stabilization time and the like can occur when the water head is high. The problems of long response time, slow regulation rate and the like can occur when parameters with good operation of a high water head operate at a low water head, and the problems are more obvious to units with longer water diversion pipelines and larger operation water head range.
Under the power mode, the speed regulator calculates the influence of water flow inertia and pulsation characteristics in a closed loop, the water flow inertia and the pulsation characteristics of different running water head units are different, and the same set of PID parameters are difficult to adapt. In order to solve the problem of parameter adaptability, a power mode should adopt variable parameters, but the current variable parameters are generally only changed according to the load variation, the invention provides a water head-based adaptive variable parameter method, which solves the problems that a unit with a large water head operating range is poor in parameter adaptability and cannot meet requirements in the power mode.
Disclosure of Invention
The technical problems solved by the invention are as follows: the method is used for solving the problems that the adaptability of parameters is poor and requirements cannot be met in a unit with a large running water head range in a power mode.
The technical scheme of the invention is as follows:
a method for adaptive parameter change of a hydroelectric generating set power mode comprises the following steps:
step 1: sampling the water level of an upstream reservoir and the tail water level of a downstream power station in real time, and dividing a water head section according to the difference value of the water level of the upstream reservoir and the tail water level of the downstream power station;
step 2: each divided water head section corresponds to a group of PID parameters, real-time updating is not needed, and the PID parameters are kept unchanged when the next water head enters in the load adjusting process;
and step 3: selecting PID parameters through multiple field tests according to the division condition of the water head section, and selecting a group of parameters which are stably regulated as the PID parameters;
and 4, step 4: according to the division of the water head section, selecting the median value +/-0.5 m of the water head section as a test water head, and finally selecting parameters as PID (proportion integration differentiation) adjusting parameters of the water head section.
Step 1, sampling the water level of an upstream reservoir and the water level of a downstream tail water of the power station operation in real time, dividing a water head section according to the difference value of the water level of the upstream reservoir and the water level of the downstream tail water of the power station operation, wherein the dividing method is the same as the dividing method of a water head of a unit vibration area test or a unit efficiency test.
Step 1, sampling the water level of an upstream reservoir and the tail water level of a downstream reservoir in the operation of the power station in real time, dividing a water head section according to the difference value of the water level of the upstream reservoir and the tail water level of the downstream reservoir in the operation of the power station, collecting the water head section once every 1-3 seconds, and when the data difference between the two previous samplings is more than or equal to 5% of a rated water head, not giving a new value to the water head.
And 3, selecting PID parameters through multiple field tests according to the division condition of the water head section, wherein the test method is a power step method, a small load step test, a medium load step test and a large load step test are respectively carried out, and each load working condition carries out a load increasing step test and a load decreasing step test.
And 3, selecting PID parameters through multiple field tests according to the division condition of the water head section, wherein the test method is a power step method, and performing a small load step test, a medium load step test and a large load step test respectively, the step quantity of the small load step test is +/-5% of the rated load of the unit, the step quantity of the medium load step test is +/-10% of the rated load of the unit, and the step quantity of the large load step test is not less than +/-25% of the rated load of the unit.
The invention has the beneficial effects that: the method for changing parameters in a power mode of the hydroelectric generating set is provided, and solves the problems that the same set of adjusting parameters cannot adapt to the change of an operating water head in the power mode, when the hydroelectric generating set operates at a non-test water head, the parameter adaptability is poor, and the response time, the adjusting rate and the adjusting stability cannot meet the requirements.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
A method for adaptive parameter change of a hydroelectric generating set power mode comprises the following steps:
step 1: the method comprises the steps of sampling the water level of an upstream reservoir and the tail water level of a downstream reservoir in real time during the operation of the power station, dividing a water head section according to the difference value of the water level of the upstream reservoir and the tail water level of the downstream reservoir in the operation of the power station, wherein the dividing method is the same as the dividing method of a water head for a unit vibration area test or a unit efficiency test, the water head section is acquired once every 1-3 seconds, and when the data difference between the two previous samplings and the data difference between the two previous samplings is more than or equal to 5% of a rated water head, the water head section is not endowed with a new value, because the sampling value is possibly distorted under the condition that.
Step 2: each divided water head section corresponds to a group of PID parameters, real-time updating is not needed, and the PID parameters are kept unchanged when the next water head enters in the load adjusting process;
and step 3: selecting PID parameters through multiple field tests according to the division condition of the water head section, and selecting a group of parameters which are stably regulated as the PID parameters; the change process of the active power and servomotor displacement signals of the unit is recorded by a recorder, related parameters are adjusted according to the load adjusting process, a group of parameters which are fast in response time when small load steps are selected, the adjusting rate meets the requirement, the parameters are not overshot when large load steps are carried out, the back adjustment is small, the stable adjustment is carried out, the group of parameters are used as power mode load adjusting parameters (PID parameters), the PID parameters are subjected to PI adjustment, and the differential value is set to be 0.
And 4, step 4: according to the division of the water head section, selecting the median value +/-0.5 m of the water head section as a test water head, and finally selecting parameters as PID (proportion integration differentiation) adjusting parameters of the water head section.
And 3, selecting PID parameters through multiple field tests according to the division condition of the water head section, wherein the test method is a power step method and is a method for respectively carrying out small load step test, medium load step test and large load step test.
And 3, selecting PID parameters through multiple field tests according to the division condition of the water head section, wherein the test method is a power step method, and performing a small load step test, a medium load step test and a large load step test respectively, the step quantity of the small load step test is +/-5% of the rated load of the unit, the step quantity of the medium load step test is +/-10% of the rated load of the unit, and the step quantity of the large load step test is not less than +/-25% of the rated load of the unit.
Claims (3)
1. A method for adaptive parameter change of a hydroelectric generating set power mode is characterized by comprising the following steps: the method comprises the following steps:
step 1: sampling the water level of an upstream reservoir and the tail water level of a downstream power station in real time, and dividing a water head section according to the difference value of the water level of the upstream reservoir and the tail water level of the downstream power station; step 1, sampling a water level of an upstream reservoir and a downstream tail water level of the power station operation in real time, dividing a water head section according to a difference value of the water level of the upstream reservoir and the downstream tail water level of the power station operation, wherein a dividing method is the same as a water head dividing method of a unit vibration area test or a unit efficiency test; step 1, sampling the water level of an upstream reservoir and the tail water level of a downstream reservoir in the operation of the power station in real time, dividing a water head section according to the difference value of the water level of the upstream reservoir and the tail water level of the downstream reservoir in the operation of the power station, collecting the water head section once every 1-3 seconds, and when the data difference between the two previous sampling and the two subsequent sampling is more than or equal to 5% of a rated water head, not giving a new value to;
step 2: each divided water head section corresponds to a group of PID parameters, real-time updating is not needed, and the PID parameters are kept unchanged when the next water head enters in the load adjusting process;
and step 3: selecting PID parameters through multiple field tests according to the division condition of the water head section, and selecting a group of parameters which are stably regulated as the PID parameters;
and 4, step 4: according to the division of the water head section, selecting the median value +/-0.5 m of the water head section as a test water head, and finally selecting parameters as PID (proportion integration differentiation) adjusting parameters of the water head section.
2. The method for adaptive parameter change of the power mode of the hydroelectric generating set according to claim 1, wherein the method comprises the following steps: and 3, selecting PID parameters through multiple field tests according to the division condition of the water head section, wherein the test method is a power step method, a small load step test, a medium load step test and a large load step test are respectively carried out, and each load working condition carries out a load increasing step test and a load decreasing step test.
3. The method for adaptive parameter change of the power mode of the hydroelectric generating set according to claim 1, wherein the method comprises the following steps: and 3, selecting PID parameters through multiple field tests according to the division condition of the water head section, wherein the test method is a power step method, and performing a small load step test, a medium load step test and a large load step test respectively, the step quantity of the small load step test is +/-5% of the rated load of the unit, the step quantity of the medium load step test is +/-10% of the rated load of the unit, and the step quantity of the large load step test is not less than +/-25% of the rated load of the unit.
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