CN111810345A - Method and system for leveling front pool water level of radial flow type hydropower station - Google Patents
Method and system for leveling front pool water level of radial flow type hydropower station Download PDFInfo
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- CN111810345A CN111810345A CN202010709757.3A CN202010709757A CN111810345A CN 111810345 A CN111810345 A CN 111810345A CN 202010709757 A CN202010709757 A CN 202010709757A CN 111810345 A CN111810345 A CN 111810345A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010977 unit operation Methods 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 6
- 238000012806 monitoring device Methods 0.000 claims description 3
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/08—Machine or engine aggregates in dams or the like; Conduits therefor, e.g. diffusors
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
-
- 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
-
- 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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/06—Energy or water supply
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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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- Chemical & Material Sciences (AREA)
- Business, Economics & Management (AREA)
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- Water Supply & Treatment (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Control Of Water Turbines (AREA)
Abstract
The invention provides a method and a system for leveling a front pool water level of a radial-flow type hydropower station, which can trigger a water level control point according to the water level change of the front pool, calculate the water quantity change of the hydropower station according to the engineering arrangement condition of the hydropower station after triggering the water level control point, and then calculate the unit efficiency change condition corresponding to different water quantities according to the unit operation current situation and the unit operation efficiency so as to realize the optimal matching of the unit load and the change flow.
Description
Technical Field
The invention relates to water conservancy projects, in particular to a method and a system for leveling the front pool water level of a radial flow type hydropower station.
Background
The runoff type hydropower station cannot effectively adjust the incoming flow, the pressure of the incoming flow is usually stabilized through a pressure forebay, the level of the water level of the forebay has obvious influence on the power generation benefit, generally, the higher the water level of the forebay is, the larger the power generation head is, the more obvious the power generation benefit is, and for the water level of the forebay, the repeated fluctuation change also influences the operation stability of a unit, so that a corresponding method needs to be established to stabilize the water level of the forebay of the runoff type hydropower station, namely, the leveling of the water level of the forebay is realized.
The water level change of the pressure forebay can reflect the change of the incoming flow, but the current water level leveling of the pressure forebay is judged by depending on the water level, the judgment can not effectively realize the leveling of the forebay water level, and the repeated adjustment is easy to trigger; when the load of the unit is adjusted according to the front pool water level, a centralized or even distribution mode of a certain unit is also adopted, the distribution mode does not consider the current running situation of the unit and the running efficiency of the unit, and has certain limitation, namely the front pool water level leveling and the efficient matching of the unit and the water quantity cannot be realized.
Disclosure of Invention
Based on the above, the invention provides a method for leveling the water level of a front pool of a radial flow type hydropower station, wherein the radial flow type hydropower station comprises a pressure front pool, a water level monitoring device is arranged on the pressure front pool, and the method is characterized in that: the method comprises the following steps:
s1: calculating a flow-output curve of each unit: analyzing each unit independently, determining the water level of a forebay to be a normal high water level, sequencing the units according to a sequence of flow from small to large according to the unit operation characteristic curve of a water turbine, calculating the water diversion loss of the unit corresponding to different flow rates and the tail water level corresponding to different flow rates according to the pipeline arrangement, calculating the operation water head of the unit according to the determined forebay water level, calculating the efficiency corresponding to the unit according to the operation water head and the flow rate, and calculating the corresponding output value under the flow rate to obtain the flow rate-output curve corresponding to each unit;
s2: when the current pool water level triggers the water level control point, the water level adjustment is carried out, the water level adjustment specifically comprises the following steps:
s21: acquiring a water level at a trigger moment and a front pool water level before a certain time period, respectively calculating a front pool water level reservoir capacity difference value corresponding to the two water level difference values, and dividing the front pool water level reservoir capacity difference value by the time period to obtain a calculated flow; if the water level rises, the calculated flow is a positive value, and if the water level falls, the calculated flow is a negative value;
s22: the method comprises the following steps of taking a flow-output curve of a starting unit, determining the current power generation flow of the starting unit according to the current output, and performing trial calculation on each unit, wherein the trial calculation method comprises the following steps: acquiring the current generating flow of each set, sequentially superposing the generating flow of each set to calculate the flow, sequentially acquiring the assumed generating flow of each set, respectively calling the flow-output curve according to the assumed generating flow of each set to obtain the assumed output of each set, selecting the set with the maximum assumed output as an adjusting set, and adjusting the output to the assumed output of the set;
s3: when the current pool water level does not trigger the water level control point, no adjustment is performed.
Preferably, when the unit output is calculated according to the flow in step S1, if the unit output is greater than the unit limit output, the unit output is taken as the unit limit output.
Preferably, the unit limit output is a rated installation.
Preferably, the unit limit output is a number which is obtained by multiplying a rated installation machine by an over-expansion coefficient, wherein the over-expansion coefficient is greater than 1.
Preferably, the water level control points may be selected as a highest water level and a lowest water level of the operation of the forebay.
A leveling system applying the method for leveling the water level of the front pool of the radial flow type hydropower station is characterized in that: the leveling system comprises a water level monitoring module and a leveling module, wherein the water level monitoring module is used for monitoring the water level of the forebay, and the leveling module is used for controlling the unit to adjust the load when the monitored water level of the forebay triggers a water level control point.
The principle of the invention is as follows:
the monitored front pool water level is used as a reaction amount, and water level adjustment is carried out when a water level control point is triggered according to the change of the front pool water level, wherein the water level adjustment method is to adjust the load of a unit, and the leveling of the front pool water level is realized by changing the water consumption of the unit; when the load of the unit is adjusted, the relationship between the operating efficiency and the flow of the unit is considered, the load adjustment value of the unit is reasonably determined, and then the optimal matching of the load and the flow of the unit is realized.
The invention has the advantages that:
the invention provides a method and a system for leveling a front pool water level of a radial-flow type hydropower station, which can trigger a water level control point according to the water level change of the front pool, calculate the water quantity change of the hydropower station according to the engineering arrangement condition of the hydropower station after triggering the water level control point, and then calculate the unit efficiency change condition corresponding to different water quantities according to the unit operation current situation and the unit operation efficiency so as to realize the optimal matching of the unit load and the change flow.
The specific implementation mode is as follows: the structure defined in the present invention will be explained in detail with reference to the embodiments.
The invention provides a method for leveling the water level of a front pool of a radial-flow type hydropower station, wherein the radial-flow type hydropower station comprises a pressure front pool, a water level monitoring device is arranged on the pressure front pool, and the method is characterized in that: the method comprises the following steps:
s1: calculating a flow-output curve of each unit: analyzing each unit independently, determining the water level of a forebay to be a normal high water level, sequencing the units according to a sequence of flow from small to large according to the unit operation characteristic curve of a water turbine, calculating the water diversion loss of the unit corresponding to different flow rates and the tail water level corresponding to different flow rates according to the pipeline arrangement, calculating the operation water head of the unit according to the determined forebay water level, calculating the efficiency corresponding to the unit according to the operation water head and the flow rate, and calculating the corresponding output value under the flow rate to obtain the flow rate-output curve corresponding to each unit;
s2: when the current pool water level triggers the water level control point, the water level adjustment is carried out, the water level adjustment specifically comprises the following steps:
s21: acquiring a water level at a trigger moment and a front pool water level before a certain time period, respectively calculating a front pool water level reservoir capacity difference value corresponding to the two water level difference values, and dividing the front pool water level reservoir capacity difference value by the time period to obtain a calculated flow; if the water level rises, the calculated flow is a positive value, and if the water level falls, the calculated flow is a negative value;
s22: the method comprises the following steps of taking a flow-output curve of a starting unit, determining the current power generation flow of the starting unit according to the current output, and performing trial calculation on each unit, wherein the trial calculation method comprises the following steps: acquiring the current generating flow of each set, sequentially superposing the generating flow of each set to calculate the flow, sequentially acquiring the assumed generating flow of each set, respectively calling the flow-output curve according to the assumed generating flow of each set to obtain the assumed output of each set, selecting the set with the maximum assumed output as an adjusting set, and adjusting the output to the assumed output of the set;
s3: when the current pool water level does not trigger the water level control point, no adjustment is performed.
Preferably, when the unit output is calculated according to the flow in step S1, if the unit output is greater than the unit limit output, the unit output is taken as the unit limit output.
Preferably, the unit limit output is a rated installation.
Preferably, the unit limit output is a number which is obtained by multiplying a rated installation machine by an over-expansion coefficient, wherein the over-expansion coefficient is greater than 1.
Preferably, the water level control points may be selected as a highest water level and a lowest water level of the operation of the forebay.
A leveling system applying the method for leveling the water level of the front pool of the radial flow type hydropower station is characterized in that: the leveling system comprises a water level monitoring module and a leveling module, wherein the water level monitoring module is used for monitoring the water level of the forebay, and the leveling module is used for controlling the unit to adjust the load when the monitored water level of the forebay triggers a water level control point.
When the quoted flow is calculated reversely according to the output, the output value can be calculated according to different flow combinations, when the calculation is carried out, the generating head is calculated according to the forebay water level, the diversion pipeline diversion loss corresponding to different flows and the tail water level, the operation efficiency is calculated by combining with the unit operation efficiency curve, then the output value is obtained, and the flow value is obtained by searching and reversely calculating according to the output value.
The above-described embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be construed as being limited to the specific forms set forth in the examples, but also includes equivalent technical means which can be conceived by those skilled in the art from the present inventive concept.
Claims (6)
1. A water level leveling method for a front pool of a radial-flow type hydropower station comprises a pressure front pool, wherein a water level monitoring device is arranged on the pressure front pool, and the method is characterized in that: the method comprises the following steps:
s1: calculating a flow-output curve of each unit: analyzing each unit independently, determining the water level of a forebay to be a normal high water level, sequencing the units according to a sequence of flow from small to large according to the unit operation characteristic curve of a water turbine, calculating the water diversion loss of the unit corresponding to different flow rates and the tail water level corresponding to different flow rates according to the pipeline arrangement, calculating the operation water head of the unit according to the determined forebay water level, calculating the efficiency corresponding to the unit according to the operation water head and the flow rate, and calculating the corresponding output value under the flow rate to obtain the flow rate-output curve corresponding to each unit;
s2: when the current pool water level triggers the water level control point, the water level adjustment is carried out, the water level adjustment specifically comprises the following steps:
s21: acquiring a water level at a trigger moment and a front pool water level before a certain time period, respectively calculating a front pool water level reservoir capacity difference value corresponding to the two water level difference values, and dividing the front pool water level reservoir capacity difference value by the time period to obtain a calculated flow; if the water level rises, the calculated flow is a positive value, and if the water level falls, the calculated flow is a negative value;
s22: the method comprises the following steps of taking a flow-output curve of a starting unit, determining the current power generation flow of the starting unit according to the current output, and performing trial calculation on each unit, wherein the trial calculation method comprises the following steps: acquiring the current generating flow of each set, sequentially superposing the generating flow of each set to calculate the flow, sequentially acquiring the assumed generating flow of each set, respectively calling the flow-output curve according to the assumed generating flow of each set to obtain the assumed output of each set, selecting the set with the maximum assumed output as an adjusting set, and adjusting the output to the assumed output of the set;
s3: when the current pool water level does not trigger the water level control point, no adjustment is performed.
2. The method of leveling the front pool water level of a radial flow type hydropower station according to claim 1, wherein: and in the step S1, when the unit output is calculated according to the flow, if the unit output is greater than the unit limit output, the unit output is taken as the unit limit output.
3. The method of leveling the front pool water level of a radial flow type hydropower station according to claim 2, wherein: the unit limit output may be a rated installation.
4. The method of leveling the front pool water level of a radial flow type hydropower station according to claim 2, wherein: the unit limit output is the number which is obtained by multiplying the rated installation by the over-expansion coefficient, and the over-expansion coefficient is more than 1.
5. The method of leveling the front pool water level of a radial flow type hydropower station according to claim 1, wherein: the water level control points may be selected as a maximum water level and a minimum water level for operation of the forebay.
6. A leveling system applying the method for leveling the front pool water level of the radial flow type hydropower station according to any one of claims 1 to 5, wherein the method comprises the following steps: the leveling system comprises a water level monitoring module and a leveling module, wherein the water level monitoring module is used for monitoring the water level of the forebay, and the leveling module is used for controlling the unit to adjust the load when the monitored water level of the forebay triggers a water level control point.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010709757.3A CN111810345A (en) | 2020-07-22 | 2020-07-22 | Method and system for leveling front pool water level of radial flow type hydropower station |
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| CN202010709757.3A CN111810345A (en) | 2020-07-22 | 2020-07-22 | Method and system for leveling front pool water level of radial flow type hydropower station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112554145A (en) * | 2020-12-21 | 2021-03-26 | 河南省水利第二工程局 | Control method for pressure forebay overflow weir without water return gate of hydropower station |
| CN113919719A (en) * | 2021-10-18 | 2022-01-11 | 河南郑大水利科技有限公司 | Method and system for calculating power generation flow of radial flow type hydropower station and method for adjusting output |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112554145A (en) * | 2020-12-21 | 2021-03-26 | 河南省水利第二工程局 | Control method for pressure forebay overflow weir without water return gate of hydropower station |
| CN113919719A (en) * | 2021-10-18 | 2022-01-11 | 河南郑大水利科技有限公司 | Method and system for calculating power generation flow of radial flow type hydropower station and method for adjusting output |
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