CN-122021216-A - Load regulation strategy optimization method for one-hole double-machine hydroelectric generating set based on pressure regulating chamber water level fluctuation

CN122021216ACN 122021216 ACN122021216 ACN 122021216ACN-122021216-A

Abstract

The invention provides a load regulation strategy optimization method of a one-hole double-machine hydroelectric generating set based on water level fluctuation of a pressure regulating chamber, and belongs to the field of water conservancy and hydropower engineering. The problem that inherent inertia of a hydraulic system is difficult to overcome by simply optimizing control parameters is solved. The method comprises the steps of establishing a hydraulic transition process simulation model comprising a diversion system, a pressure regulating chamber, a water turbine and a speed regulating system, obtaining a total load regulating instruction of a power station, setting a single allowable maximum load regulating amplitude of a single unit, dividing the total load regulating instruction into four regulating sections according to the total load regulating instruction, matching with corresponding sectional delay regulating logic, adopting a particle swarm optimization algorithm, taking the average value of the water level fluctuation of the pressure regulating chamber as an optimization target, respectively optimizing key time control parameters, sending step regulating instructions to speed regulators of the two units, controlling the units to execute guide vane opening adjustment, and naturally attenuating the energy of the water level fluctuation of the pressure regulating chamber in an action gap. The method is used in the field of development and construction of hydropower stations.

Inventors

Zhang Haiku
LI GUIJI
HUANG YOULIN
JIANG MINGHONG
YAN XIAOHUI
Xing Juke
ZHONG HUOQUAN

Assignees

大唐水电科学技术研究院有限公司
四川大唐国际甘孜水电开发有限公司

Dates

Publication Date: 20260512
Application Date: 20260130

Claims (10)

1. The utility model provides a two quick-witted hydroelectric set load regulation tactics optimization method of one hole based on surge chamber water level fluctuation which characterized in that is applied to two hydroelectric set and shares a diversion tunnel and an upstream surge chamber's hydroelectric power plant system, the method includes: establishing a hydraulic transition process simulation model comprising a diversion system, a pressure regulating chamber, a water turbine and a speed regulating system; Acquiring a total load regulation instruction of a power station, and setting a single allowable maximum load regulation amplitude of a single unit; dividing the total load adjusting instruction into four continuous adjusting intervals according to the absolute value of the total load adjusting instruction, and matching corresponding sectional delay adjusting logic for each interval; Adopting a particle swarm optimization algorithm, taking the average value of the water level fluctuation of the pressure regulating chamber as an optimization target, and respectively optimizing key time control parameters aiming at different regulating intervals; And sending step-by-step adjusting instructions to the speed regulators of the two units according to the optimized time control parameters and the sectional delay adjusting logic, and controlling the units to execute guide vane opening adjustment so as to naturally attenuate the energy of the water level fluctuation of the pressure regulating chamber in the action gap.
2. The optimization method of the load regulation strategy of the one-hole double-machine hydroelectric generating set based on the fluctuation of the water level of the pressure regulating chamber according to claim 1, wherein the dividing standard of the four regulation intervals is as follows: The first interval is that the absolute value of the total load adjusting instruction is more than 0 and less than or equal to 50% of the rated capacity of a single unit; the second interval is that the absolute value of the total load adjusting instruction is more than 50% and less than or equal to 100% of the rated capacity of the single unit; The third interval is that the absolute value of the total load adjusting instruction is more than 100% and less than or equal to 150% of the rated capacity of the single unit; and in the fourth interval, the absolute value of the total load regulation command is greater than 150% and less than or equal to 200% of the rated capacity of the single unit.
3. The optimization method of the one-hole double-machine hydroelectric generating set load regulation strategy based on the surge tank water level fluctuation according to claim 1, wherein the segmentation delay regulation logic specifically comprises: if the instruction value is in the first interval, the first unit only completes all load adjustment at one time; if the command value is in the second interval, the first machine unit is divided into two parts to complete the adjustment, and the time interval between the two actions is that ; If the instruction value is in the third interval, the first machine set completes adjustment twice, and the second machine set is started at the time T after the first machine set acts for the first time, so that the residual load adjustment is completed; if the instruction value is in the fourth interval, the first machine unit completes the adjustment twice, the second machine unit is started after the first machine unit acts for the first time by T time, and the second machine unit also acts for two times, and the interval between the two acts is that 。
4. The optimization method for the load regulation strategy of the one-hole double-machine hydroelectric generating set based on the fluctuation of the water level of the pressure regulating chamber according to claim 1, wherein the single allowable maximum load regulation amplitude of the single machine set is set to be 50% of the rated installed capacity of the machine set.
5. The optimization method of the one-hole double-machine hydroelectric generating set load adjustment strategy based on the surge tank water level fluctuation according to claim 1, wherein the optimization objective function of the particle swarm optimization algorithm is as follows: Wherein, the The real-time water level value of the pressure regulating chamber at the ith sampling moment in the simulation process; the water level value is the initial time of the pressure regulating chamber, and N is the total sampling point number.
6. The optimization method of the one-hole double-machine hydroelectric generating set load regulation strategy based on the surge tank water level fluctuation according to claim 1, wherein the decision variable of the particle swarm optimization algorithm is a time parameter combination And optimizing the load-increasing and load-reducing working conditions independently.
7. The optimization method of the one-hole double-machine hydroelectric generating set load adjustment strategy based on the surge tank water level fluctuation according to claim 6, wherein the optimizing process of the particle swarm optimization algorithm comprises the following steps: taking 100% of rated capacity of a single machine as an adjusting instruction, and optimizing the interval between two actions of a first machine set ; Taking 150% of single machine rated capacity as an adjusting instruction, and optimizing the time interval of the first action of the second machine set and the first machine set ; The 200% single machine rated capacity is used as an adjusting instruction to optimize the interval between two actions of the second machine set 。
8. The optimization method of the one-hole double-machine hydroelectric generating set load regulation strategy based on the surge tank water level fluctuation according to claim 1, wherein in the hydraulic transition process simulation model, a diversion system is modeled by adopting a characteristic line method, and a control equation is as follows: Wherein: In the formula, At the moment for a certain water cross section in the pipeline Is a flow rate of (1); A water head of a certain flow section of the pipeline at a moment t relative to a certain reference surface; calculating the water head of the point P for the time t; calculating the flow of the point P for the moment t; Is that The water head of the adjacent point A on the left side of the point P at the moment; Respectively is The flow of the adjacent point A on the left side of the point P at the moment; Is that A water head of an adjacent point B on the right side of the point P at the moment; Is that The flow of the adjacent point B on the right side of the point P at the moment; the hydraulic friction coefficient of the pipeline; the distance from the corresponding flow section to the designed origin is given; Is the wave velocity of water hammer; is the diameter of the pipeline; is the cross-sectional area of the pipeline; calculating the flow of the point P at the moment t; Is a rim Characteristic constants of the characteristic lines; Is the characteristic impedance of the pipeline; Is a rim Characteristic constants of the characteristic lines; gravitational acceleration; is the cross-sectional area of the conduit.
9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes a one-hole double-machine hydroelectric generating set load regulation strategy optimization method based on pressure regulating chamber water level fluctuation according to any one of claims 1 to 8.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when being executed by a processor, performs the steps of a one-hole two-machine hydroelectric generating set load regulation strategy optimization method based on surge tank water level fluctuation as claimed in any one of claims 1 to 8.

Description

Load regulation strategy optimization method for one-hole double-machine hydroelectric generating set based on pressure regulating chamber water level fluctuation Technical Field The invention belongs to the field of water conservancy and hydropower engineering, and particularly relates to a load regulation strategy optimization method of a one-hole double-machine hydroelectric generating set based on water level fluctuation of a pressure regulating chamber. Background In the development and construction of hydropower stations, limited by the topography and geological conditions or in order to reduce the construction cost, a water diversion arrangement form of 'one-hole multi-machine' is often adopted, wherein 'one-hole double-machine' (namely, two hydroelectric generating sets share a long water diversion tunnel and an upstream pressure regulating chamber) is the most common. The pressure regulating chamber is used as a key protection facility in the water diversion system, and has the core functions of reflecting water hammer waves, reducing the water hammer pressure and improving the running stability of the unit. However, when such plants are subjected to a large load regulation, the large water flow inertia causes severe water level fluctuations in the pressure regulating chamber. For the units sharing the pressure regulating chamber, if the two units act simultaneously or nearly simultaneously, the generated hydraulic interference can be mutually overlapped, so that the fluctuation amplitude of the water level of the pressure regulating chamber is further amplified, and the frequent falling of the quick gate at the inlet of the pressure regulating chamber is easily caused. The method not only causes unplanned shutdown and brings great potential safety hazard, but also seriously affects the economy and reliability of the operation of the power station. In the prior art, solutions to the above problems have focused mainly on two directions. The first direction is to optimize the load distribution and control strategy, but the traditional practice usually adopts a simple average load distribution mode, and lacks fine control on the action cooperativity and time interval of multiple units. The rough control logic cannot effectively utilize the attenuation characteristic of the surge, and is difficult to avoid the phenomenon of fluctuation superposition and even resonance, so that the rough control logic has little effect on inhibiting severe water level fluctuation caused by large-amplitude load change. The second direction is to change the structure of the pressure regulating chamber to improve the hydraulic performance, such as enlarging the cross-sectional area of the pressure regulating chamber or adding impedance holes. Although this type of approach can improve the surge to some extent, it has inherent, insurmountable drawbacks. First, structural modifications are often limited to on-site geological conditions, and not all power stations are conditioned for implementation. Secondly, the construction cost of the engineering measures is usually very high, the construction difficulty is high, the period is long, and for the operated power station, the implementation of transformation means long-time shutdown, so that the economic loss is huge and the feasibility is extremely low. Therefore, the person skilled in the art has long faced the dilemma that, on the one hand, the mere optimization of the control parameters is difficult to overcome the inherent inertia of the hydraulic system with limited effectiveness, and on the other hand, the efficient structural modification scheme is difficult to implement due to the constraints of cost and technical feasibility. Disclosure of Invention In view of the above, the invention aims to provide a load regulation strategy optimization method of a one-hole double-machine hydroelectric generating set based on the water level fluctuation of a pressure regulating chamber, so as to solve the problem that the inherent inertia of a hydraulic system is difficult to overcome by simply optimizing control parameters. The invention adopts the following technical scheme that the method for optimizing the load regulation strategy of the one-hole double-machine hydroelectric generating set based on the water level fluctuation of the pressure regulating chamber is applied to a hydropower station system in which two hydroelectric generating sets share one diversion tunnel and one upstream pressure regulating chamber, and comprises the following steps: establishing a hydraulic transition process simulation model comprising a diversion system, a pressure regulating chamber, a water turbine and a speed regulating system; Acquiring a total load regulation instruction of a power station, and setting a single allowable maximum load regulation amplitude of a single unit; dividing the total load adjusting instruction into four continuous adjusting intervals according to the absolute val