CN111738626A - Starting method and system of radial flow type hydropower station - Google Patents
Starting method and system of radial flow type hydropower station Download PDFInfo
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- 230000003247 decreasing effect Effects 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 11
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
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Abstract
The invention provides a starting method and a starting system of a radial-flow type hydropower station, which can realize the matching of a unit and flow, improve the integral utilization efficiency of the unit and improve the power generation benefit under the working condition of limited incoming flow by estimating and judging the incoming flow, combining the operation efficiency of the unit of the power station, carrying out optimization selection and selecting a reasonable starting scheme.
Description
Technical Field
The invention relates to water conservancy projects, in particular to a starting method and a starting system of a radial flow type hydropower station.
Background
The radial-flow hydropower station cannot effectively regulate incoming flow, so that the starting combination of the radial-flow hydropower station needs to be matched with the incoming flow, and on the basis, the forebay needs to be stabilized at a high water level as much as possible so as to improve the generating head of the radial-flow hydropower station. For the radial flow type hydropower station, because the machine set installation size, the machine set model, the machine set arrangement and other forms are different, the utilization efficiency of different water amounts is different, and in order to improve the utilization efficiency of hydroenergy, the reasonable determination of the startup mode needs to be carried out by combining the arrangement form, the installation model and the efficiency of the machine set.
At present, the radial flow type hydropower station is started by manpower, the starting mode is started by experience, the starting mode is started in a full load or equal division mode, the starting mode has blind randomness, and the utilization efficiency of a unit is low. The operating efficiency curve of the unit is an important reference for the operating state of the unit, and the operating efficiency of the unit is not considered in the starting operation of the conventional radial flow type hydropower station, so that scientific and reasonable guidance is lacked.
Disclosure of Invention
Based on the above, the invention provides a starting method of a radial flow type hydropower station, wherein the radial flow type hydropower station comprises a front pool, 2 hydropower station installation units are provided, and the starting method comprises the following steps:
s1: obtaining the incoming flow of the power station: determining the inflow of the power station diversion canal according to the inflow information of the diversion canal or an upstream power station or a diversion canal water intake;
s2: acquiring unit operation characteristic curves of water turbines of each unit;
s3: when the incoming flow is smaller than the maximum value of the rated flows 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, according to the distribution mode of the incoming flow, calculating the head loss and the tail water level of the first unit or the second unit according to the arrangement mode of the water diversion system and the arrangement mode of the tail water, then obtaining the generating head of the first unit or the second unit, respectively according to the generating heads of the first unit and the second unit and the distributed flow, searching the operation characteristic curve of the units, searching the corresponding efficiency, respectively calculating the output values of the corresponding first unit and the corresponding second unit, and finding out the unit with the maximum value and the output value thereof as a starting unit and a starting output;
s4: when the incoming flow is greater than the maximum value of the rated flows of the two units, the incoming flow is divided equally firstly, the two units select half of the incoming flow, the front pool water level is assumed to be a normal high water level, the flows are distributed to the first unit and the second unit respectively, according to the distribution mode of the incoming flow, the head loss and the tail water level of the first unit and the second unit are obtained through calculation according to the arrangement mode of the water diversion system and the arrangement mode of the tail water, then the power generation heads of the first unit and the second unit are obtained, the operation characteristic curves of the units are searched according to the power generation heads of the first unit and the second unit and the distributed flows of the first unit and the second unit, the corresponding efficiencies of the units are searched, the corresponding output values of the first unit and the second unit are calculated respectively, the total output value is obtained through addition, and then the following steps are carried out:
increasing a certain flow rate for the first unit, reducing a certain flow rate for the second unit, then calculating to obtain a first unit output force value and a second unit output force value corresponding to the working condition according to the step in the step S4, and calculating a total output force value of the units; and the following judgment is made:
s41: if the total output value of the units is increased, the first unit continues to increase a certain flow, the second unit continues to decrease a certain flow, the step in the step S4 is continuously executed, the corresponding first unit output value and the second unit output value are obtained through calculation, 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 total output value is reduced, 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 unit output corresponding to the flow is the starting output;
s42: if the total output value of the units is not changed, starting each unit according to the output value corresponding to half of the incoming flow;
s43: if the total output value of the units is decreased, the first unit decreases 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, corresponding first unit output value and second unit output value are obtained through calculation according to the steps 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 total output value is decreased, the average value of the two flows of the first decreasing step or the first decreasing step and the last step is selected as the starting flow of each unit, and the unit output corresponding to the flow is the starting output.
Preferably, the inflow rate is obtained by installing a water level gauge or a current measuring device on the water diversion channel; when the water level meter is installed, the inflow rate needs to be converted according to the combination of the water level meter and the arrangement of the water diversion channel.
Preferably, 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.
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.
A system applying the starting-up method is characterized in that: the system comprises an incoming flow determining module and a starting determining module, wherein the incoming flow determining module is used for determining the incoming flow of the power station, and the starting determining module is used for selecting corresponding starting according to the incoming flow and the unit characteristics.
The principle of the invention is as follows:
the method comprises the steps of acquiring the inflow flow of an approach channel of a power station by using a corresponding measuring device of the power station, judging the inflow flow on the basis, starting the unit by using the flow, specifically, leading the operating efficiency of the unit, and taking the height of the operating efficiency and the total output of the unit as the judgment basis of the starting flow.
The invention has the advantages that:
the invention provides a starting method and a starting system of a radial-flow type hydropower station, which can realize the matching of a unit and flow, improve the integral utilization efficiency of the unit and improve the power generation benefit under the working condition of limited incoming flow by estimating and judging the incoming flow, combining the operation efficiency of the unit of the power station, carrying out optimization selection and selecting a reasonable starting scheme.
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 starting method of a radial flow type hydropower station, wherein the radial flow type hydropower station comprises a front pool, 2 hydropower station installation units are provided, and the starting method comprises the following steps:
s1: obtaining the incoming flow of the power station: determining the inflow of the power station diversion canal according to the inflow information of the diversion canal or an upstream power station or a diversion canal water intake;
s2: acquiring unit operation characteristic curves of water turbines of each unit;
s3: when the incoming flow is smaller than the maximum value of the rated flows 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, according to the distribution mode of the incoming flow, calculating the head loss and the tail water level of the first unit or the second unit according to the arrangement mode of the water diversion system and the arrangement mode of the tail water, then obtaining the generating head of the first unit or the second unit, respectively according to the generating heads of the first unit and the second unit and the distributed flow, searching the operation characteristic curve of the units, searching the corresponding efficiency, respectively calculating the output values of the corresponding first unit and the corresponding second unit, and finding out the unit with the maximum value and the output value thereof as a starting unit and a starting output;
s4: when the incoming flow is greater than the maximum value of the rated flows of the two units, the incoming flow is divided equally firstly, the two units select half of the incoming flow, the front pool water level is assumed to be a normal high water level, the flows are distributed to the first unit and the second unit respectively, according to the distribution mode of the incoming flow, the head loss and the tail water level of the first unit and the second unit are obtained through calculation according to the arrangement mode of the water diversion system and the arrangement mode of the tail water, then the power generation heads of the first unit and the second unit are obtained, the operation characteristic curves of the units are searched according to the power generation heads of the first unit and the second unit and the distributed flows of the first unit and the second unit, the corresponding efficiencies of the units are searched, the corresponding output values of the first unit and the second unit are calculated respectively, the total output value is obtained through addition, and then the following steps are carried out:
increasing a certain flow rate for the first unit, reducing a certain flow rate for the second unit, then calculating to obtain a first unit output force value and a second unit output force value corresponding to the working condition according to the step in the step S4, and calculating a total output force value of the units; and the following judgment is made:
s41: if the total output value of the units is increased, the first unit continues to increase a certain flow, the second unit continues to decrease a certain flow, the step in the step S4 is continuously executed, the corresponding first unit output value and the second unit output value are obtained through calculation, 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 total output value is reduced, 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 unit output corresponding to the flow is the starting output;
s42: if the total output value of the units is not changed, starting each unit according to the output value corresponding to half of the incoming flow;
s43: if the total output value of the units is decreased, the first unit decreases 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, corresponding first unit output value and second unit output value are obtained through calculation according to the steps 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 total output value is decreased, the average value of the two flows of the first decreasing step or the first decreasing step and the last step is selected as the starting flow of each unit, and the unit output corresponding to the flow is the starting output.
Preferably, the inflow rate is obtained by installing a water level gauge or a current measuring device on the water diversion channel; when the water level meter is installed, the inflow rate needs to be converted according to the combination of the water level meter and the arrangement of the water diversion channel.
Preferably, 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.
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.
A system applying the starting-up method is characterized in that: the system comprises an incoming flow determining module and a starting determining module, wherein the incoming flow determining module is used for determining the incoming flow of the power station, and the starting determining module is used for selecting corresponding starting according to the incoming flow and the 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 by combining different arrangement of the units, so that the maximum total output value of the units under the flow is determined, and the utilization efficiency of the units is highest at the moment. The optimization method can better solve the problem of the starting strategy 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 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 starting method of a radial flow type hydropower station comprises a front pool, 2 hydropower station installation units are provided, and the starting method comprises the following steps:
s1: obtaining the incoming flow of the power station: determining the inflow of the power station diversion canal according to the inflow information of the diversion canal or an upstream power station or a diversion canal water intake;
s2: acquiring unit operation characteristic curves of water turbines of each unit;
s3: when the incoming flow is smaller than the maximum value of the rated flows 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, according to the distribution mode of the incoming flow, calculating the head loss and the tail water level of the first unit or the second unit according to the arrangement mode of the water diversion system and the arrangement mode of the tail water, then obtaining the generating head of the first unit or the second unit, respectively according to the generating heads of the first unit and the second unit and the distributed flow, searching the operation characteristic curve of the units, searching the corresponding efficiency, respectively calculating the output values of the corresponding first unit and the corresponding second unit, and finding out the unit with the maximum value and the output value thereof as a starting unit and a starting output;
s4: when the incoming flow is greater than the maximum value of the rated flows of the two units, the incoming flow is divided equally firstly, the two units select half of the incoming flow, the front pool water level is assumed to be a normal high water level, the flows are distributed to the first unit and the second unit respectively, according to the distribution mode of the incoming flow, the head loss and the tail water level of the first unit and the second unit are obtained through calculation according to the arrangement mode of the water diversion system and the arrangement mode of the tail water, then the power generation heads of the first unit and the second unit are obtained, the operation characteristic curves of the units are searched according to the power generation heads of the first unit and the second unit and the distributed flows of the first unit and the second unit, the corresponding efficiencies of the units are searched, the corresponding output values of the first unit and the second unit are calculated respectively, the total output value is obtained through addition, and then the following steps are carried out:
increasing a certain flow rate for the first unit, reducing a certain flow rate for the second unit, then calculating to obtain a first unit output force value and a second unit output force value corresponding to the working condition according to the step in the step S4, and calculating a total output force value of the units; and the following judgment is made:
s41: if the total output value of the units is increased, the first unit continues to increase a certain flow, the second unit continues to decrease a certain flow, the step in the step S4 is continuously executed, the corresponding first unit output value and the second unit output value are obtained through calculation, 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 total output value is reduced, 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 unit output corresponding to the flow is the starting output;
s42: if the total output value of the units is not changed, starting each unit according to the output value corresponding to half of the incoming flow;
s43: if the total output value of the units is decreased, the first unit decreases 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, corresponding first unit output value and second unit output value are obtained through calculation according to the steps 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 total output value is decreased, the average value of the two flows of the first decreasing step or the first decreasing step and the last step is selected as the starting flow of each unit, and the unit output corresponding to the flow is the starting output.
2. The method for determining the start-up of a radial flow hydropower station according to the incoming flow as claimed in claim 1, characterized in that: the inflow rate is obtained by installing a water level gauge or a current measuring device on the water diversion channel; when the water level meter is installed, the inflow rate needs to be converted according to the combination of the water level meter and the arrangement of the water diversion channel.
3. The method for determining the start-up of a radial flow hydropower station according to the incoming flow as claimed in claim 1, characterized in that: and when the output of the set is calculated according to the flow, if the output of the set is greater than the limited output of the set, taking the output of the set as the limited output of the set.
4. A method of determining the start-up of a radial flow hydroelectric power station according to the incoming flow rate, as claimed in claim 3, wherein: the unit limit output may be a rated installation.
5. A method of determining the start-up of a radial flow hydroelectric power station according to the incoming flow rate, as claimed in claim 3, 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.
6. A system using the booting method according to any one of claims 1 to 5, characterized in that: the system comprises an incoming flow determining module and a starting determining module, wherein the incoming flow determining module is used for determining the incoming flow of the power station, and the starting determining module is used for selecting corresponding starting according to the incoming flow and the unit characteristics.
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