CN111597687B - Variable-speed pumped storage unit water pump working condition efficiency optimizing method - Google Patents
Variable-speed pumped storage unit water pump working condition efficiency optimizing method Download PDFInfo
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- CN111597687B CN111597687B CN202010303478.7A CN202010303478A CN111597687B CN 111597687 B CN111597687 B CN 111597687B CN 202010303478 A CN202010303478 A CN 202010303478A CN 111597687 B CN111597687 B CN 111597687B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004146 energy storage Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 238000011217 control strategy Methods 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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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
Abstract
The invention discloses a variable-speed pump for a pumped storage unitThe working condition efficiency optimizing method comprises the following steps: firstly, drawing a flow characteristic curve and a moment characteristic curve of the working condition of a water pump turbine according to model experimental data of the water pump turbine; next, an equal unit output P is calculated 11 On-line unit rotational speed n 11 And unit flow rate Q 11 And find out the relation of each equal unit output P 11 The highest efficiency point on the curve; thirdly, fitting the data of the highest efficiency point by adopting a least square method to obtain the optimal opening alpha opt And unit output P 11 Optimal unit rotation speed n 11opt And unit output P 11 Is a function of (a); finally, calculating the optimal opening alpha under the given unit input power P and the real-time lift H by utilizing the functional relation obtained by the steps opt Optimum rotational speed n opt The unit control system adjusts the unit according to the optimal opening alpha opt And an optimal rotational speed n opt The highest efficiency can be obtained by running.
Description
Technical Field
The invention belongs to the technical field of hydraulic turbine adjustment of hydropower stations, and particularly relates to a variable-speed pump storage unit water pump working condition efficiency optimizing method.
Background
Variable speed pumped storage units require efficiency optimization based on a given power and real-time head (lift). The efficiency optimization of the unit is closely related to a control strategy, and the control strategy can change along with the change of working conditions. Under the working condition of the water turbine, the water turbine speed regulator regulates the opening of the guide vane according to the difference value of the optimal rotating speed and the real-time rotating speed, and the rotor side controller controls the active output of the generator according to the difference value of the given power and the real-time power, so that the unit operates at the optimal efficiency; under the working condition of the water pump, the water turbine speed regulator regulates the opening of the guide vane according to the optimal opening, and the rotor side controller controls the active output of the generator according to the difference value between the given power and the real-time power and the difference value between the optimal rotating speed and the real-time rotating speed, so that the unit operates at the optimal efficiency. Therefore, the efficiency optimization of the water turbine working condition only optimizes the rotating speed, and the efficiency optimization of the water pump working condition needs to optimize the rotating speed and the opening.
The working condition efficiency optimization of the variable-speed water pump energy storage unit water turbine is studied more, and the working condition of the water pump is not reported. In general, when the water pump works, the lift change is large, and because the input power of the unit needs to be adjusted in the power grid frequency modulation, in order to ensure the high-efficiency operation of the unit, the optimal opening degree and the optimal rotating speed of the unit need to be searched according to the given input power and the real-time lift so as to ensure the operation of the water pump energy storage unit at the highest efficiency, and the working condition efficiency of the water pump of the variable-speed water pump energy storage unit can be optimized.
Disclosure of Invention
The invention aims to provide a variable-speed pumped storage unit water pump working condition efficiency optimizing method, which is used for searching an optimal opening alpha corresponding to the highest efficiency point of a unit under given unit input power P and real-time lift H according to model experimental data of a water pump and a water turbine opt Optimum rotational speed n opt The unit control system adjusts the unit according to the optimal opening alpha opt And an optimal rotational speed n opt The operation is carried out to ensure that the efficiency is highest when the variable-speed pumped storage unit is in the working condition of the water pump.
The invention adopts the technical scheme that the method for optimizing the working condition efficiency of the variable-speed pump storage unit water pump is implemented according to the following steps:
step 1: the data such as the rotating speed n, the lift H, the flow Q, the moment M and the like in the experimental data of the water pump turbine model are utilized, and the rotating wheel diameter D of the model unit is utilized 1 Drawing a flow characteristic curve and a moment characteristic curve of the working condition of the water pump turbine;
step 2: according to the moment characteristic curve of the water pump working condition of the water pump turbine, drawing an equal unit output P in the flow characteristic curve of the water pump working condition of the water pump turbine 11 A wire;
step 3: find out the unit output P of each equal unit 11 On-line unit flow rate Q 11 The point with the largest absolute value, namely the highest efficiency point, and the corresponding optimal unit rotating speed n 11opt And an optimal opening alpha opt ；
Step 4: fitting an optimal opening alpha according to the data of the highest efficiency point in the step 3 opt And unit output P 11 Optimal unit rotation speed n 11opt And unit output P 11 Is a function of (a);
step 5: calculating unit output P according to given unit input power P and lift H 11 And (4) finding out the optimal opening alpha of the running of the water pump turbine by using the result of the step (4) opt And an optimal unit rotational speed n 11opt According to the optimal unit rotation speed n 11opt Calculating the optimal rotation speed n of the water pump turbine opt The unit control system adjusts the unit according to the optimal opening alpha opt And an optimal rotational speed n opt The highest efficiency can be obtained by running.
Further, the specific implementation of the step 1 is as follows:
calculating the unit rotation speed n of each working condition point 11 The formula of (2) is:
in the formula (1), the working condition n of the water turbine is more than 0, and the working condition n of the water pump is less than 0;
calculating unit flow Q of each working condition point 11 The formula of (2) is:
in the formula (2), the working condition Q of the water turbine is more than 0, and the working condition Q of the water pump is less than 0;
calculating unit moment M of each working point 11 The formula of (2) is:
and drawing a flow characteristic curve and a moment characteristic curve of the water pump working condition of the water pump turbine according to the calculation formula.
Further, the specific implementation of the step 2 is as follows:
unit output P of each working point 11 Can be controlled by the unit rotation speed n of the same working point 11 And a unit moment M 11 The formula is:
the flow characteristic curve of the working condition of the water pump turbine is drawn with equal unit output P 11 A wire.
Further, in the step 4, the least square method is adopted to fit the data of the highest efficiency point to obtain the optimal opening alpha opt And unit output P 11 Optimal unit rotation speed n 11opt And unit output P 11 Is a function of (a).
Further, the specific implementation of the step 5 is as follows:
unit output P 11 The calculation formula of (2) is as follows:
in the formula (5), D is the nominal diameter of the water pump turbine;
the calculation formula of the optimal rotation speed nopt is as follows:
in formula (6), n 11opt Is the optimal unit rotation speed.
Compared with the prior art, the invention has the following beneficial effects: the method provides a variable-speed pump energy storage unit water pump working condition efficiency optimizing method to ensure that the pump energy storage unit operates at the highest efficiency.
Drawings
FIG. 1 is a computational flow diagram of the present invention;
FIG. 2 is a flow characteristic curve of the pump condition of the pump turbine of the present invention;
FIG. 3 is a graph showing torque characteristics of the pump conditions of the pump turbine of the present invention;
FIG. 4 shows the flow characteristic curve of the pump condition of the pump turbine according to the present invention 11 A line and an optimal efficiency point;
FIG. 5 is an optimum opening alpha of the present invention opt And unit output P 11 Is a relationship of (2);
FIG. 6 is an optimum unit rotational speed n of the present invention 11opt And unit output P 11 Is a relationship of (2);
in the drawing, a 1-equal unit output curve and a 2-equal opening curve are shown.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in further detail below with reference to the detailed description and the computational flow diagram (fig. 1).
The method for optimizing the working condition efficiency of the variable-speed pump storage unit water pump is implemented according to the following steps:
step 1: the data such as the rotating speed n, the lift H, the flow Q, the moment M and the like in the experimental data of the water pump turbine model are utilized, and the rotating wheel diameter D of the model unit is utilized 1 Drawing a flow characteristic curve (shown in figure 2) and a moment characteristic curve (shown in figure 3) of the working condition of the water pump turbine;
calculating the unit rotation speed n of each working condition point 11 The formula of (2) is:
in formula (1), the working condition n of the water turbine is more than 0, and the working condition n of the water pump is less than 0.
Calculating unit flow Q of each working condition point 11 The formula of (2) is:
in equation (2), the turbine operating condition Q >0, and the pump operating condition Q <0.
Calculating unit moment M of each working point 11 The formula of (2) is:
step 2: according to the moment characteristic curve of the water pump working condition of the water pump turbine, drawing an equal unit output P in the flow characteristic curve of the water pump working condition of the water pump turbine 11 A wire;
unit output P of each working point 11 Can be controlled by the unit rotation speed n of the same working point 11 And a unit moment M 11 The method comprises the following steps:
step 3: find out the unit output P of each equal unit 11 On-line unit flow rate Q 11 The point with the largest absolute value, namely the highest efficiency point, and the corresponding optimal unit rotating speed n 11opt And an optimal opening alpha opt As shown in fig. 4;
step 4: fitting an optimal opening alpha according to the data of the highest efficiency point in the step 3 opt And unit output P 11 Optimal unit rotation speed n 11opt And unit output P 11 Is a function of (a);
as shown in fig. 4, each maximum efficiency point corresponds to a set of parameters (n 11opt 、α opt 、P 11 ). The data of all the highest efficiency points form a three-dimensional array, and the data of the three-dimensional array are respectively divided into (n 11opt 、P 11 ) And (alpha) opt 、P 11 ) Fitting by using a least square method to obtain the optimal opening alpha opt And unit output P 11 (as in FIG. 5), optimal unit rotational speed n 11opt And unit output P 11 (e.g., FIG. 6);
step 5: calculating unit output P according to given unit input power P and real-time lift H 11 Respectively byFig. 5 and 6 find the optimal opening alpha for the operation of the pump turbine opt And an optimal unit rotational speed n 11opt According to the optimal unit rotation speed n 11opt Calculating the optimal rotation speed n of the water pump turbine opt The unit control system adjusts the unit according to the optimal opening alpha opt And an optimal rotational speed n opt The highest efficiency can be obtained by running.
Unit output P 11 The calculation formula of (2) is as follows:
in the formula (5), D is the nominal diameter of the water pump turbine.
Optimum rotation speed n opt The calculation formula of (2) is as follows:
in formula (6), n 11opt Is the optimal unit rotation speed.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (3)
1. The method for optimizing the working condition efficiency of the variable-speed pump storage unit water pump is characterized by comprising the following steps of:
step 1: the data such as the rotating speed n, the lift H, the flow Q, the moment M and the like in the experimental data of the water pump turbine model are utilized, and the rotating wheel diameter D of the model unit is utilized 1 Drawing a flow characteristic curve and a moment characteristic curve of the working condition of the water pump turbine;
step 2: according to the moment characteristic curve of the working condition of the water pump turbine, inThe flow characteristic curve of the working condition of the water pump turbine is drawn with equal unit output P 11 A wire;
unit output P of each working point 11 Can be controlled by the unit rotation speed n of the same working point 11 And a unit moment M 11 The formula is:
the flow characteristic curve of the working condition of the water pump turbine is drawn with equal unit output P 11 A wire;
step 3: find out the unit output P of each equal unit 11 On-line unit flow rate Q 11 The point with the largest absolute value, namely the highest efficiency point, and the corresponding optimal unit rotating speed n 11opt And an optimal opening alpha opt ；
Step 4: fitting an optimal opening alpha according to the data of the highest efficiency point in the step 3 opt And unit output P 11 Optimal unit rotation speed n 11opt And unit output P 11 Is a function of (a);
step 5: calculating unit output P according to given unit input power P and lift H 11 And (4) finding out the optimal opening alpha of the running of the water pump turbine by using the result of the step (4) opt And an optimal unit rotational speed n 11opt According to the optimal unit rotation speed n 11opt Calculating the optimal rotation speed n of the water pump turbine opt The unit control system adjusts the unit according to the optimal opening alpha opt And an optimal rotational speed n opt The highest efficiency can be obtained by running;
unit output P 11 The calculation formula of (2) is as follows:
in the formula (5), D is the nominal diameter of the water pump turbine;
the calculation formula of the optimal rotation speed nopt is as follows:
in formula (6), n 11opt Is the optimal unit rotation speed.
2. The method for optimizing the working condition efficiency of the variable-speed pump storage unit water pump according to claim 1, wherein the specific method of the step 1 is as follows:
calculating the unit rotation speed n of each working condition point 11 The formula of (2) is:
in the formula (1), the working condition n of the water turbine is more than 0, and the working condition n of the water pump is less than 0;
calculating unit flow Q of each working condition point 11 The formula of (2) is:
in the formula (2), the working condition Q of the water turbine is more than 0, and the working condition Q of the water pump is less than 0;
calculating unit moment M of each working point 11 The formula of (2) is:
and drawing a flow characteristic curve and a moment characteristic curve of the water pump working condition of the water pump turbine according to the calculation formula.
3. The method for optimizing the working condition efficiency of a variable-speed pumped storage unit water pump according to claim 1, wherein in the step 4, a least square method is adopted to fit the data of the highest efficiency point to obtain an optimal opening alpha opt And unit output P 11 Optimal unit rotation speed n 11opt And unit output P 11 Is a function of (a).
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| CN112904721B (en) * | 2021-01-18 | 2022-02-01 | 武汉大学 | Coordinated control method for variable-speed pumped storage unit |
| CN113757030B (en) * | 2021-09-10 | 2022-11-25 | 昆明理工大学 | Method and system for optimizing rotating speed and flow rate of variable-speed operation of mixed-flow turbine |
| CN113757019B (en) * | 2021-09-30 | 2022-09-06 | 中国水利水电科学研究院 | Full-power variable-frequency water turbine working condition rapid active power response operation method and system |
| CN115076020B (en) | 2022-07-07 | 2022-12-02 | 中国长江三峡集团有限公司 | Method, device and equipment for optimizing water pump working condition of variable-speed pumped storage unit |
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| US20070028632A1 (en) * | 2005-08-03 | 2007-02-08 | Mingsheng Liu | Chiller control system and method |
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