CN116522675A - Hydropower station optimization method - Google Patents
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Abstract
The invention provides a hydropower station optimizing method which is suitable for a radial hydropower station, and is characterized in that a flow measuring device is arranged in a water diversion channel to measure the incoming flow of the hydropower station, the water level of a pool before the pressure of the hydropower station is utilized to carry out starting judgment, a scientific optimizing strategy and a method are adopted to realize the optimal distribution of the incoming flow among units, and under the condition of fully utilizing the incoming flow, the reasonable generation of the starting and the optimization of the units is realized, and the overall running performance and the running benefit of the hydropower station are improved.
Description
Technical Field
The invention relates to the field of water conservancy, in particular to a hydropower station optimization method.
Background
The hydropower station is a building structure form for generating electricity by utilizing water energy, the water flow energy is converted into electric energy through the water turbine generator set, the radial hydropower station cannot effectively regulate incoming flow, in the starting operation of the radial hydropower station, the matching property of the incoming flow and the water for generating electricity by the water turbine generator set needs to be ensured, and the incoming flow also needs to be reasonably distributed by combining the unit performance so as to realize the optimal utilization of the water flow energy.
Most of the existing hydropower station optimizing operation methods stay at the theoretical level, are difficult to apply in practice, such as a recursive optimization method, an exhaustion method and the like, a large amount of simulation calculation is needed, and as only theoretical allocation is considered in calculation, flow allocation cannot be effectively realized, the situation that the sum of the final allocation flows of two units is unequal to the incoming flow or the situation that the sum of the final allocation flows of the two units is equal to the incoming flow is generated, but the unreasonable allocation causes larger calculation resource waste, and the optimization is difficult to coincide with the actual operation of the hydropower station.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a hydropower station optimizing method which provides scientific and reasonable technical support for starting-up operation of a radial hydropower station unit.
The invention provides a hydropower station optimizing method, the hydropower station includes the water diversion channel, pressure front pool and hydroelectric generating set, the said water diversion channel is equipped with the flow measuring device, is used for obtaining the inflow flow Q of the hydropower station, the said water diversion channel is connected with pressure front pool, the said pressure front pool is connected with hydroelectric generating set through the pressure pipeline, the said pressure front pool is equipped with the water level measuring device, used for monitoring the water level H of the pressure front pool in real time, the said hydroelectric generating set is equipped with two, there are first machine set and second machine set separately, the machine set model of the said first machine set and second machine set is the same, the installed capacity is the same, the minimum start-up flow Qmin and full-up flow Qmax of the said first machine set and second machine set are the same, characterized by that: the optimized operation method comprises the following steps:
s1: when the hydropower station is not started, the water level of the pool before pressure is lower than the normal high water level H0, the flow measuring device arranged in the water diversion channel is utilized to obtain the incoming flow Q of the hydropower station, and the minimum starting flow Qmin and full starting flow Qmax of the first unit and the second unit are obtained;
s2: dividing the starting-up flow of the first unit into n parts from 0 to Qmax to respectively obtain starting-up split flow Q1i of the first unit, wherein n is a positive integer greater than or equal to 10; when Q1i is less than Q and Q1i is greater than or equal to Q-Qmax/n, let Q1i equal Q;
s3: after the division of the starting flow of the first unit is completed, the starting division flow Q2i of the second unit is obtained, the starting division flow Q2i of the second unit corresponds to the starting division flow of the first unit one by one, the starting division flow Q2i of the second unit is judged, when the starting division flow Q2i of the second unit is smaller than Qmin, the starting division flow Q2i of the second unit is enabled to be equal to 0, and when the starting division flow Q2i of the second unit is larger than Qmax, the starting division flow Q2i of the second unit is enabled to be equal to Qmax;
s4: obtaining n+1 groups of starting-up combinations, wherein the starting-up split flow of a first unit in each group of combinations is Q1i in the step S2, and the starting-up split flow of a second unit is Q2i in the step S3;
s5: setting the water level of a pool before pressure as a normal high water level H0, calculating the tail water level of a hydropower station corresponding to a flow Q, combining the water diversion system arrangement of a first unit and a second unit, calculating the water diversion losses of the first unit and the second unit corresponding to the first unit start-up split flow Q1i and the second unit start-up split flow Q2i of each group in the step S4, calculating the power generation heads of the first unit and the second unit, calculating the power generation efficiency of the first unit and the second unit according to the power generation heads and the start-up split flow of the first unit and the second unit, combining the efficiency characteristic curves of the first unit and the second unit, calculating the output value N1 of the first unit and the output value N2 of the second unit and the output sum Nz of the first unit and the second unit according to the start-up split flow of the first unit and the second unit, and calculating the output sum Nz corresponding to each group start-up split combination in the step S4;
s6: finding out a group with the largest output sum Nz for the output sum Nz corresponding to each group of starting-up combinations obtained in the step S5, and finding out a group with the largest output sum Nz corresponding to the first unit output value N10 and the second unit output value N20;
s7: when the water level measuring device of the pressure front pool reaches the normal high water level H0, the first unit and the second unit are started, and the output values of the first unit and the second unit are respectively equal to N10 and N20 in the step S6.
Preferably, in step S5, when the output value N1 of the first unit is calculated to be smaller than the minimum startup output, the output value N1 of the first unit is equal to 0; when the output value N1 of the first unit is calculated to be larger than the full output force, the output value N1 of the first unit is equal to the full output force; when the output value N2 of the second unit is calculated to be smaller than the minimum starting-up output, the output value N2 of the second unit is equal to 0; when the output value N2 of the second unit is calculated to be larger than the full output force, the output value N2 of the second unit is equal to the full output force.
Preferably, in step S5, the method for calculating the tailwater level of the hydropower station corresponding to the flow Q is as follows: and calculating the tail water level of the hydropower station corresponding to the flow Q according to the tail water flow curve of the hydropower station.
Preferably, the tailwater flow curve of the hydropower station is a corresponding curve of tailwater level and flow, and can be obtained by hydraulic calculation according to the tailwater channel setting of the hydropower station, and can also be obtained by calibration according to actual operation data of the hydropower station.
Preferably, the pre-pressure tank is provided with an overflow weir, the normal high water level H0 of the pre-pressure tank is lower than the weir crest elevation setting distance of the overflow weir, and the setting distance is 10-30 cm.
The working principle of the invention is as follows:
for a radial hydropower station, when the starting scheme is manufactured, the incoming flow of the hydropower station needs to be accurately known, and the unit flow is reasonably distributed according to the unit performance and arrangement condition. The invention sets a flow measuring device in the water diversion channel of the hydropower station, which is used for obtaining the incoming flow of the hydropower station as the distribution basis, monitoring the front pool water level in real time, and starting the machine set to operate when the front pool water level reaches the high water level.
For the allocation of a constant flow Q, if the flow Q is directly allocated, i.e.: dividing from 0 to Q, when the flow Q is too large, if n parts are determined, the dividing is possibly too thick, and if the dividing is too many, the calculating resource waste is possibly caused; the invention therefore proposes to use a split between 0 and the full flow Qmax for the split of the first set, i.e. for each flow, the number of splits and the split flow of the first set are the same. However, in the case where Q is smaller than Qmax, if Q is just between the split flows, the processing should be performed by: when Q1i is less than Q and Q1i is greater than or equal to Q-Qmax/n, let Q1i be equal to Q. If the output of the step is not carried out, the distribution flow of the second unit is small and can not support starting, and the distribution flow of the first unit can not be matched with the incoming flow, so that the distribution is unreasonable.
After the partial flow of the first unit is determined, the partial flow of the second unit is determined according to the partial flow of the first unit, and the partial flow of the second unit is the incoming flow minus the partial flow of the first unit, so that the situation that the incoming flow is larger and larger than the full-emission flow can be overcome, all operation conditions can be covered, and the method has higher and constant calculation efficiency.
For the obtained startup combination, as the flow rates of the first unit and the second unit are already determined, the output values of the first unit and the second unit of the hydropower station can be calculated according to the water level of the front pool, the tail water level and the head loss of the water turbine generator unit and by combining the operation characteristic curves of the hydropower station, a group with the largest output values of the hydropower station corresponding to the startup combination of different groups is obtained, the output values of the first unit and the second unit corresponding to the group are found out, and therefore the output combination is determined to be distributed as the optimal output combination corresponding to the flow rate.
When the water level of the front pool rises to a high water level, starting up the unit according to the optimal output combination, and then completing the starting up optimal distribution of the radial hydropower station. The optimization method provided by the invention is reasonable and feasible in the process of dividing the flow of the first unit and the second unit, is stable in calculation, and effectively overcomes the conditions that the total flow of the first unit and the second unit is not equal to the incoming flow and the working condition that the calculation efficiency is low.
The invention has the advantages that:
the invention provides a hydropower station optimizing method which is suitable for a radial hydropower station, and is characterized in that a flow measuring device is arranged in a water diversion channel to measure the incoming flow of the hydropower station, the water level of a pool before the pressure of the hydropower station is utilized to carry out starting judgment, a scientific optimizing strategy and a method are adopted to realize the optimal distribution of the incoming flow among units, and under the condition of fully utilizing the incoming flow, the reasonable generation of the starting and the optimization of the units is realized, and the overall running performance and the running benefit of the hydropower station are improved.
Detailed Description
The present invention will be specifically explained below.
The invention provides a hydropower station optimizing method, the hydropower station includes the water diversion channel, pressure front pool and hydroelectric generating set, the said water diversion channel is equipped with the flow measuring device, is used for obtaining the inflow flow Q of the hydropower station, the said water diversion channel is connected with pressure front pool, the said pressure front pool is connected with hydroelectric generating set through the pressure pipeline, the said pressure front pool is equipped with the water level measuring device, used for monitoring the water level H of the pressure front pool in real time, the said hydroelectric generating set is equipped with two, there are first machine set and second machine set separately, the machine set model of the said first machine set and second machine set is the same, the installed capacity is the same, the minimum start-up flow Qmin and full-up flow Qmax of the said first machine set and second machine set are the same, characterized by that: the optimized operation method comprises the following steps:
s1: when the hydropower station is not started, the water level of the pool before pressure is lower than the normal high water level H0, the flow measuring device arranged in the water diversion channel is utilized to obtain the incoming flow Q of the hydropower station, and the minimum starting flow Qmin and full starting flow Qmax of the first unit and the second unit are obtained;
s2: dividing the starting-up flow of the first unit into n parts from 0 to Qmax to respectively obtain starting-up split flow Q1i of the first unit, wherein n is a positive integer greater than or equal to 10; when Q1i is less than Q and Q1i is greater than or equal to Q-Qmax/n, let Q1i equal Q;
s3: after the division of the starting flow of the first unit is completed, the starting division flow Q2i of the second unit is obtained, the starting division flow Q2i of the second unit corresponds to the starting division flow of the first unit one by one, the starting division flow Q2i of the second unit is judged, when the starting division flow Q2i of the second unit is smaller than Qmin, the starting division flow Q2i of the second unit is enabled to be equal to 0, and when the starting division flow Q2i of the second unit is larger than Qmax, the starting division flow Q2i of the second unit is enabled to be equal to Qmax;
s4: obtaining n+1 groups of starting-up combinations, wherein the starting-up split flow of a first unit in each group of combinations is Q1i in the step S2, and the starting-up split flow of a second unit is Q2i in the step S3;
s5: setting the water level of a pool before pressure as a normal high water level H0, calculating the tail water level of a hydropower station corresponding to a flow Q, combining the water diversion system arrangement of a first unit and a second unit, calculating the water diversion losses of the first unit and the second unit corresponding to the first unit start-up split flow Q1i and the second unit start-up split flow Q2i of each group in the step S4, calculating the power generation heads of the first unit and the second unit, calculating the power generation efficiency of the first unit and the second unit according to the power generation heads and the start-up split flow of the first unit and the second unit, combining the efficiency characteristic curves of the first unit and the second unit, calculating the output value N1 of the first unit and the output value N2 of the second unit and the output sum Nz of the first unit and the second unit according to the start-up split flow of the first unit and the second unit, and calculating the output sum Nz corresponding to each group start-up split combination in the step S4;
s6: finding out a group with the largest output sum Nz for the output sum Nz corresponding to each group of starting-up combinations obtained in the step S5, and finding out a group with the largest output sum Nz corresponding to the first unit output value N10 and the second unit output value N20;
s7: when the water level measuring device of the pressure front pool reaches the normal high water level H0, the first unit and the second unit are started, and the output values of the first unit and the second unit are respectively equal to N10 and N20 in the step S6.
Preferably, in step S5, when the output value N1 of the first unit is calculated to be smaller than the minimum startup output, the output value N1 of the first unit is equal to 0; when the output value N1 of the first unit is calculated to be larger than the full output force, the output value N1 of the first unit is equal to the full output force; when the output value N2 of the second unit is calculated to be smaller than the minimum starting-up output, the output value N2 of the second unit is equal to 0; when the output value N2 of the second unit is calculated to be larger than the full output force, the output value N2 of the second unit is equal to the full output force.
Preferably, in step S5, the method for calculating the tailwater level of the hydropower station corresponding to the flow Q is as follows: and calculating the tail water level of the hydropower station corresponding to the flow Q according to the tail water flow curve of the hydropower station.
Preferably, the tailwater flow curve of the hydropower station is a corresponding curve of tailwater level and flow, and can be obtained by hydraulic calculation according to the tailwater channel setting of the hydropower station, and can also be obtained by calibration according to actual operation data of the hydropower station.
Preferably, the pre-pressure tank is provided with an overflow weir, the normal high water level H0 of the pre-pressure tank is lower than the weir crest elevation setting distance of the overflow weir, and the setting distance is 10-30 cm.
The fraction n may be selected to be 20 parts or 50 parts or 100 parts.
The minimum startup flow of the hydropower station is the minimum flow of the hydropower station under the condition that the hydropower station can start up, and when no data exists, the full startup flow of the hydropower station can be multiplied by a certain proportion, for example, 20% -40%. The full-power flow is the flow when the startup output of the hydropower station is equal to the rated output, the minimum flow and the maximum flow of the hydropower station are flow values corresponding to the situation that the water level of the pool is the normal high water level H0 before the pressure of the hydropower station, the full-power flow can be calculated by combining the arrangement form of the hydropower station and the operation characteristic curve of a unit, and the full-power flow can also be obtained in a test mode, and necessary flow measuring equipment is added when the test is performed.
Preferably, the optimization method is realized by means of a computer control system, the computer control system can remotely acquire the incoming flow of the hydropower station and the water level of the pressure front pool, can judge by combining the incoming flow and the water level of the pressure front pool, and gives a reasonable starting scheme when the hydropower station needs to be started, and the optimization method is realized by means of computer programming.
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 (5)
1. The utility model provides a hydropower station optimizing method, hydropower station includes diversion channel, pressure forebay and hydroelectric set, diversion channel facial make-up is equipped with flow measurement device for obtain hydropower station's inflow flow Q, diversion channel is connected with the pressure forebay, pressure forebay passes through the pressure piping connection with hydroelectric set, the pressure forebay is equipped with water level measurement device for the water level H in real-time supervision pressure forebay, hydroelectric set installs two for first unit and second unit respectively, the unit model of first unit and second unit is the same, and the installed capacity is the same, the minimum start-up flow Qmin and full-power flow Qmax of first unit and second unit are the same, its characterized in that: the optimized operation method comprises the following steps:
s1: when the hydropower station is not started, the water level of the pool before pressure is lower than the normal high water level H0, the flow measuring device arranged in the water diversion channel is utilized to obtain the incoming flow Q of the hydropower station, and the minimum starting flow Qmin and full starting flow Qmax of the first unit and the second unit are obtained;
s2: dividing the starting-up flow of the first unit into n parts from 0 to Qmax to respectively obtain starting-up split flow Q1i of the first unit, wherein n is a positive integer greater than or equal to 10; when Q1i is less than Q and Q1i is greater than or equal to Q-Qmax/n, let Q1i equal Q;
s3: after the division of the starting flow of the first unit is completed, the starting division flow Q2i of the second unit is obtained, the starting division flow Q2i of the second unit corresponds to the starting division flow of the first unit one by one, the starting division flow Q2i of the second unit is judged, when the starting division flow Q2i of the second unit is smaller than Qmin, the starting division flow Q2i of the second unit is enabled to be equal to 0, and when the starting division flow Q2i of the second unit is larger than Qmax, the starting division flow Q2i of the second unit is enabled to be equal to Qmax;
s4: obtaining n+1 groups of starting-up combinations, wherein the starting-up split flow of a first unit in each group of combinations is Q1i in the step S2, and the starting-up split flow of a second unit is Q2i in the step S3;
s5: setting the water level of a pool before pressure as a normal high water level H0, calculating the tail water level of a hydropower station corresponding to a flow Q, combining the water diversion system arrangement of a first unit and a second unit, calculating the water diversion losses of the first unit and the second unit corresponding to the first unit start-up split flow Q1i and the second unit start-up split flow Q2i of each group in the step S4, calculating the power generation heads of the first unit and the second unit, calculating the power generation efficiency of the first unit and the second unit according to the power generation heads and the start-up split flow of the first unit and the second unit, combining the efficiency characteristic curves of the first unit and the second unit, calculating the output value N1 of the first unit and the output value N2 of the second unit and the output sum Nz of the first unit and the second unit according to the start-up split flow of the first unit and the second unit, and calculating the output sum Nz corresponding to each group start-up split combination in the step S4;
s6: finding out a group with the largest output sum Nz for the output sum Nz corresponding to each group of starting-up combinations obtained in the step S5, and finding out a group with the largest output sum Nz corresponding to the first unit output value N10 and the second unit output value N20;
s7: when the water level measuring device of the pressure front pool reaches the normal high water level H0, the first unit and the second unit are started, and the output values of the first unit and the second unit are respectively equal to N10 and N20 in the step S6.
2. The hydropower station optimization method according to claim 1, wherein: in step S5, when the output value N1 of the first unit is calculated to be smaller than the minimum startup output, the output value N1 of the first unit is equal to 0; when the output value N1 of the first unit is calculated to be larger than the full output force, the output value N1 of the first unit is equal to the full output force; when the output value N2 of the second unit is calculated to be smaller than the minimum starting-up output, the output value N2 of the second unit is equal to 0; when the output value N2 of the second unit is calculated to be larger than the full output force, the output value N2 of the second unit is equal to the full output force.
3. The hydropower station optimization method according to claim 1, wherein: in step S5, the method for calculating the tail water level of the hydropower station corresponding to the flow Q includes: and calculating the tail water level of the hydropower station corresponding to the flow Q according to the tail water flow curve of the hydropower station.
4. A hydropower station optimization method as claimed in claim 3, wherein: the tail water flow curve of the hydropower station is a corresponding curve of the tail water level and the flow, can be obtained by hydraulic calculation according to the tail water channel setting of the hydropower station, and can also be obtained by calibrating according to the actual operation data of the hydropower station.
5. The hydropower station optimization method according to claim 1, wherein: the pressure forehearth is provided with an overflow weir, the normal high water level H0 of the pressure forehearth is lower than the weir crest elevation of the overflow weir by a set distance, and the set distance is 10-30 cm.
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