CN111738626B - Starting method and system for radial hydropower station - Google Patents
Starting method and system for radial hydropower station Download PDFInfo
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- 238000010248 power generation Methods 0.000 claims description 16
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000010977 unit operation Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 1
- 230000000452 restraining effect Effects 0.000 claims 1
- 238000005457 optimization Methods 0.000 abstract description 3
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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Abstract
The invention provides a starting method and a system for a radial hydropower station, which are used for carrying out pre-estimation judgment on incoming flows, carrying out optimization selection by combining with the running efficiency of a power station unit, and selecting a reasonable starting scheme.
Description
Technical Field
The invention relates to hydraulic engineering, in particular to a starting method and a starting system for a radial hydropower station.
Background
The radial flow type hydropower station cannot effectively regulate the incoming flow, so that the starting combination of the radial flow type hydropower station needs to be matched with the incoming flow, and on the basis, the front pool is required to be stabilized at a high water level as much as possible, so that the power generation water head of the radial flow type hydropower station is improved. For a radial-flow hydropower station, the unit size, the unit model, the unit arrangement and other forms are different, so that the utilization efficiency of different water amounts is different, and the reasonable determination of the starting mode is needed by combining the arrangement form, the unit model and the efficiency of the unit in order to improve the utilization efficiency of the water energy.
At present, the radial hydropower station is started by manual operation, the starting mode is started by experience, full load or equal division mode is adopted, the starting mode has blind randomness, and the unit utilization efficiency is low. The running efficiency curve of the unit is an important reference of the running state of the unit, and the running efficiency of the unit is not considered in the current starting-up running of the radial hydropower station, so that scientific and reasonable guidance is lacked.
Disclosure of Invention
Based on the above, the invention provides a starting-up method of a radial hydropower station, the radial hydropower station comprises a front pool, and the number of machine sets of the hydropower station is 2, and the starting-up method is as follows:
s1: obtaining incoming flow of a power station: determining the incoming flow of the water intake of the power station or the upstream power station or the water intake of the water intake channel according to the incoming water information of the water intake channel or the upstream power station or the water intake of the water intake channel;
s2: acquiring a unit operation characteristic curve of a water turbine of each unit;
s3: when the incoming flow is smaller than the maximum value of rated flow of the two units, assuming that the front pool water level is a normal high water level, respectively distributing the incoming flow to the first unit or the second unit, calculating according to the incoming flow distribution mode, according to the water diversion system arrangement mode and the tail water arrangement mode, obtaining the water head loss and the tail water level of the first unit or the second unit, then obtaining the power generation water head of the first unit or the second unit, respectively according to the power generation water heads of the first unit and the second unit and the flow distributed by the power generation water heads, searching the operation characteristic curves of the units, searching the corresponding efficiency, then respectively calculating the output values of the first unit and the second unit corresponding to the output values, and finding out the unit corresponding to the maximum output value and the output value as a starting unit and a starting output;
s4: when the incoming flow is larger than the maximum value of rated flow of two units, firstly dividing equally, selecting half of the incoming flow by the two units, assuming that the front pool water level is a normal high water level, respectively distributing the incoming flow to the first unit and the second unit, calculating the head loss and the tail water level of the first unit and the second unit according to the distribution mode of the incoming flow and the distribution mode of the diversion system, further obtaining the power generation heads of the first unit and the second unit, respectively according to the power generation heads of the first unit and the second unit and the distributed flow, searching the operation characteristic curves of the units, searching the corresponding efficiency, further respectively calculating the output values of the corresponding first unit and the second unit, adding to obtain the total output value, and then carrying out the following steps:
adding a certain flow to the first unit, reducing a certain flow by the second unit, and then calculating to obtain a first unit output value and a second unit output value corresponding to the working condition according to the step in the step S4, and calculating a total unit output value; and the following judgment is carried out:
s41: if the total output value of the machine set is increased, the first machine set continues to increase a certain flow, the second machine set continues to decrease a certain flow, the step S4 is continuously executed, the corresponding output value of the first machine set and the output value of the second machine set are obtained through calculation, the total output value of the machine set is calculated, the relation between the total output value and the last calculated total output value is judged, if the total output value is increased, the adjustment is continuously executed until the first descent step or the average value of the two flow of the first descent step and the last step is selected as the starting flow of each machine set, and the machine set output corresponding to the flow is the starting output;
s42: if the total output value of the units is unchanged, starting up according to the output value corresponding to half of the incoming flow of each unit;
s43: if the total output value of the unit is reduced, the first unit reduces a certain flow on the basis of half of the incoming flow, the second unit increases a certain flow on the basis of half of the incoming flow, the corresponding output value of the first unit and the output value of the second unit are obtained through calculation according to the step in the step S4, the total output value of the unit is calculated, the relation between the total output value and the last calculated total output value is judged, if the total output value is increased, the adjustment is continuously executed until the reduction occurs, and the first reduction step or the average value of the two flows of the first reduction step and the last step is selected as the starting flow of each unit, and the output of the unit corresponding to the flow is the starting output.
Preferably, the incoming flow is obtained by installing a water level gauge or a flow measuring device on the water diversion channel; when the water level meter is installed, the incoming flow is needed to be converted according to the water level meter combined with the water diversion channel arrangement.
Preferably, when the set output is calculated according to the flow, if the set output is larger than the set limit output, the set output is taken as the set limit output.
Preferably, the unit limiting output is a rated load.
Preferably, the unit limiting force is rated installed multiplied by an overdriving coefficient, and the overdriving coefficient is a number greater than 1.
The system applying the starting-up method is characterized in that: the system comprises an incoming flow determining module and a starting-up determining module, wherein the incoming flow determining module is used for determining incoming flow of a power station, and the starting-up determining module is used for selecting corresponding starting-up according to the incoming flow and combining unit characteristics.
The principle of the invention is as follows:
the method comprises the steps of obtaining the incoming flow of the water channel by using a corresponding measuring device of a power station, judging the incoming flow on the basis, starting up the unit by using the incoming flow, and particularly introducing the operation efficiency of the unit, and taking the operation efficiency and the total output of the unit as the judging basis of the starting-up flow.
The invention has the advantages that:
the invention provides a starting method and a system for a radial hydropower station, which are used for carrying out pre-estimation judgment on incoming flows, carrying out optimization selection by combining with the running efficiency of a power station unit, and selecting a reasonable starting scheme.
The specific embodiment is as follows: the structure defined by the present invention is specifically explained below with reference to the following embodiments.
The invention provides a starting-up method of a radial-flow hydropower station, which comprises a front pool, wherein 2 hydropower station loader units are arranged, and the starting-up method is as follows:
s1: obtaining incoming flow of a power station: determining the incoming flow of the water intake of the power station or the upstream power station or the water intake of the water intake channel according to the incoming water information of the water intake channel or the upstream power station or the water intake of the water intake channel;
s2: acquiring a unit operation characteristic curve of a water turbine of each unit;
s3: when the incoming flow is smaller than the maximum value of rated flow of the two units, assuming that the front pool water level is a normal high water level, respectively distributing the incoming flow to the first unit or the second unit, calculating according to the incoming flow distribution mode, according to the water diversion system arrangement mode and the tail water arrangement mode, obtaining the water head loss and the tail water level of the first unit or the second unit, then obtaining the power generation water head of the first unit or the second unit, respectively according to the power generation water heads of the first unit and the second unit and the flow distributed by the power generation water heads, searching the operation characteristic curves of the units, searching the corresponding efficiency, then respectively calculating the output values of the first unit and the second unit corresponding to the output values, and finding out the unit corresponding to the maximum output value and the output value as a starting unit and a starting output;
s4: when the incoming flow is larger than the maximum value of rated flow of two units, firstly dividing equally, selecting half of the incoming flow by the two units, assuming that the front pool water level is a normal high water level, respectively distributing the incoming flow to the first unit and the second unit, calculating the head loss and the tail water level of the first unit and the second unit according to the distribution mode of the incoming flow and the distribution mode of the diversion system, further obtaining the power generation heads of the first unit and the second unit, respectively according to the power generation heads of the first unit and the second unit and the distributed flow, searching the operation characteristic curves of the units, searching the corresponding efficiency, further respectively calculating the output values of the corresponding first unit and the second unit, adding to obtain the total output value, and then carrying out the following steps:
adding a certain flow to the first unit, reducing a certain flow by the second unit, and then calculating to obtain a first unit output value and a second unit output value corresponding to the working condition according to the step in the step S4, and calculating a total unit output value; and the following judgment is carried out:
s41: if the total output value of the machine set is increased, the first machine set continues to increase a certain flow, the second machine set continues to decrease a certain flow, the step S4 is continuously executed, the corresponding output value of the first machine set and the output value of the second machine set are obtained through calculation, the total output value of the machine set is calculated, the relation between the total output value and the last calculated total output value is judged, if the total output value is increased, the adjustment is continuously executed until the first descent step or the average value of the two flow of the first descent step and the last step is selected as the starting flow of each machine set, and the machine set output corresponding to the flow is the starting output;
s42: if the total output value of the units is unchanged, starting up according to the output value corresponding to half of the incoming flow of each unit;
s43: if the total output value of the unit is reduced, the first unit reduces a certain flow on the basis of half of the incoming flow, the second unit increases a certain flow on the basis of half of the incoming flow, the corresponding output value of the first unit and the output value of the second unit are obtained through calculation according to the step in the step S4, the total output value of the unit is calculated, the relation between the total output value and the last calculated total output value is judged, if the total output value is increased, the adjustment is continuously executed until the reduction occurs, and the first reduction step or the average value of the two flows of the first reduction step and the last step is selected as the starting flow of each unit, and the output of the unit corresponding to the flow is the starting output.
Preferably, the incoming flow is obtained by installing a water level gauge or a flow measuring device on the water diversion channel; when the water level meter is installed, the incoming flow is needed to be converted according to the water level meter combined with the water diversion channel arrangement.
Preferably, when the set output is calculated according to the flow, if the set output is larger than the set limit output, the set output is taken as the set limit output.
Preferably, the unit limiting output is a rated load.
Preferably, the unit limiting force is rated installed multiplied by an overdriving coefficient, and the overdriving coefficient is a number greater than 1.
The system applying the starting-up method is characterized in that: the system comprises an incoming flow determining module and a starting-up determining module, wherein the incoming flow determining module is used for determining incoming flow of a power station, and the starting-up determining module is used for selecting corresponding starting-up according to the incoming flow and combining unit characteristics.
When the method or the system is used, the corresponding output values under different flow distribution can be calculated according to the incoming flow information and different arrangements of the units, so that the maximum total output value of the units under the determined flow is realized, and the utilization efficiency of the units is the highest. The optimization method can better solve the starting strategy problem of the hydropower station and can provide scientific guidance for the operation of the hydropower station.
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 by the examples, but also includes equivalent technical means as will occur to those skilled in the art based on the inventive concept.
Claims (6)
1. The starting-up method of the radial hydropower station comprises a front pool, and the number of the hydropower station loader units is 2, and the starting-up method is as follows:
s1: obtaining the incoming flow of a water power station: determining the inflow of the water power station water intake channel according to the inflow information of the water intake channel or the upstream water power station or the water intake of the water intake channel;
s2: acquiring a unit operation characteristic curve of a water turbine of each unit;
s3: when the incoming flow is smaller than the maximum value of rated flow of the two units, assuming that the front pool water level is a normal high water level, distributing the incoming flow to the first unit or the second unit, calculating according to the incoming flow distribution mode, according to the water diversion system arrangement mode and the tail water arrangement mode, obtaining the water head loss and the tail water level of the first unit or the second unit, obtaining the power generation water head of the first unit or the second unit, respectively according to the power generation water heads of the first unit and the second unit and the flow distributed by the power generation water heads, searching the operation characteristic curves of the units, searching the corresponding efficiency, then respectively calculating the output values of the first unit and the second unit, finding the unit with the maximum output value and the output value, and taking the unit and the output value as a starting unit and a starting output;
s4: when the incoming flow is larger than the maximum value of rated flow of two units, firstly dividing equally, selecting half of the incoming flow by the two units, assuming that the front pool water level is a normal high water level, respectively distributing the incoming flow to the first unit and the second unit, calculating the head loss and the tail water level of the first unit and the second unit according to the distribution mode of the incoming flow and the distribution mode of the diversion system, further obtaining the power generation heads of the first unit and the second unit, respectively according to the power generation heads of the first unit and the second unit and the distributed flow, searching the operation characteristic curves of the units, searching the corresponding efficiency, further respectively calculating the output values of the corresponding first unit and the second unit, adding to obtain the total output value, and then carrying out the following steps:
adding a certain flow to the first unit, reducing a certain flow by the second unit, calculating to obtain a certain flow added to the first unit according to the step in the step S4, reducing a first unit output value and a second unit output value corresponding to the certain flow by the second unit, and calculating a total output value of the units; and the following judgment is carried out:
s41: if the total output value of the machine set is increased, the first machine set continues to increase a certain flow, the second machine set continues to decrease a certain flow, the step S4 is continuously executed, the corresponding output value of the first machine set and the output value of the second machine set are obtained through calculation, the total output value of the machine set is calculated, the relation between the total output value and the last calculated total output value is judged, if the total output value is increased, the adjustment is continuously executed until the flow is reduced, the flow value of the first reducing step is selected as the starting flow of each machine set or the average value of the two flows of the first reducing step and the last step is selected as the starting flow of each machine set, and the output of the machine set corresponding to the flow is the starting output;
s42: if the total output value of the units is unchanged, starting up according to the output value corresponding to half of the incoming flow of each unit;
s43: if the total output value of the units is reduced, the first unit reduces a certain flow on the basis of half of the incoming flow, the second unit increases a certain flow on the basis of half of the incoming flow, the corresponding output value of the first unit and the output value of the second unit are obtained through calculation according to the step in the step S4, the total output value of the units is calculated, the relation between the total output value and the last calculated total output value is judged, if the total output value is increased, the adjustment is continuously executed until the reduction occurs, the flow value of the first reduction step is selected as the starting-up flow of each unit, or the average value of the two flows of the first reduction step and the last step is selected as the starting-up flow of each unit, and the output of the unit corresponding to the flow is the starting-up output.
2. A method for starting up a radial hydropower station according to claim 1, characterized in that: the incoming flow is obtained by installing a water level gauge or a flow measuring device on the water diversion channel; when the water level meter is installed, the incoming flow is needed to be converted according to the water level meter combined with the water diversion channel arrangement.
3. A method for starting up a radial hydropower station according to claim 1, characterized in that: and when the set output is calculated according to the flow, if the set output is larger than the set limiting output, taking the set output as the set limiting output.
4. A method for starting up a radial hydropower station according to claim 3, wherein: the unit restraining force may be a rated load.
5. A method for starting up a radial hydropower station according to claim 3, wherein: the unit limiting output is rated installation multiplied by an overdriving coefficient, and the overdriving coefficient is a number larger than 1.
6. A system applying the boot-up method of any of claims 1-5, characterized in that: the system comprises an incoming flow determining module and a starting-up determining module, wherein the incoming flow determining module is used for determining incoming flow of the hydropower station, and the starting-up determining module is used for selecting a corresponding starting-up scheme according to the incoming flow combined with the unit characteristics.
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