阅读说明：本技术 一种基于抽水蓄能电站的过速保护与流量控制方法 (Overspeed protection and flow control method based on pumped storage power station ) 是由 严良平 丁向东 王景彤 郑伟 崔博涛 董瑞靖 于 2021-09-14 设计创作，主要内容包括：本发明公开了一种基于抽水蓄能电站的过速保护与流量控制方法,该方法整体采用流量控制系统,所述流量控制系统包括航道分析模块、过速分析模块和抽水蓄电模块,所述航道分析模块用于观测抽水蓄能电站航道的通行船只,所述过速分析模块用于检测水轮机转速过快的异常升温情况,所述抽水蓄电模块用于通过水泵水轮机组从下游水库抽水到上游水库,以位能形式蓄存能量,所述航道分析模块包括图像收集模块、数据集比对模块和距离分析模块,所述过速分析模块包括温度检测模块和温差分析模块,所述抽水蓄电模块包括水轮机负荷模块和电力分配模块,所述温差分析模块与电力分配模块电连接；本发明,具有根据船只数量调节水电站抽水量的特点。(The invention discloses an overspeed protection and flow control method based on a pumped storage power station, which integrally adopts a flow control system, the flow control system comprises a channel analysis module, an overspeed analysis module and a water pumping and power storage module, the channel analysis module is used for observing passing ships of a pumped storage power station channel, the overspeed analysis module is used for detecting abnormal temperature rise conditions of the water turbine with too high rotating speed, the water pumping and power storage module is used for pumping water from a downstream reservoir to an upstream reservoir through a water pump turbine set, the energy is stored in a potential energy form, the channel analysis module comprises an image collection module, a data set comparison module and a distance analysis module, the overspeed analysis module comprises a temperature detection module and a temperature difference analysis module, the water pumping and power storage module comprises a water turbine load module and a power distribution module, and the temperature difference analysis module is electrically connected with the power distribution module; the invention has the characteristic of adjusting the water pumping amount of the hydropower station according to the number of ships.)

1. An overspeed protection and flow control method based on a pumped storage power station is characterized by comprising the following steps: the method integrally adopts a flow control system, the flow control system comprises a channel analysis module, an overspeed analysis module and a water pumping and storing module, the channel analysis module is used for observing passing ships of a channel of the pumped storage power station, the overspeed analysis module is used for detecting abnormal temperature rise conditions of the water turbine with too fast rotating speed, and the water pumping and storing module is used for pumping water from a downstream reservoir to an upstream reservoir through a water pump turbine set to store energy in a potential energy form.

2. The pumped-storage power station-based overspeed protection and flow control method according to claim 1, characterized in that: the channel analysis module comprises an image collection module, a data set comparison module and a distance analysis module, the overspeed analysis module comprises a temperature detection module and a temperature difference analysis module, the water pumping and electricity storage module comprises a water turbine load module and an electric power distribution module, and the temperature difference analysis module is electrically connected with the electric power distribution module;

the image collection module is used for gathering channel information, the data set is compared the module and is used for discerning the ship on the channel, the data set is compared the module and is used for comparing image information, the navigation ship in the discernment image, distance analysis module is used for calculating each navigation ship of reservoir low reaches and power station distance, temperature detection module is used for detecting the motor temperature when the hydraulic turbine load rotates, temperature difference analysis module is used for judging the intensification condition of motor, hydraulic turbine load module is used for drawing water to the upper reaches reservoir from the low reaches through the hydraulic turbine, electric power distribution module is used for adjusting the rotational speed load according to the temperature condition of hydraulic turbine and reaches the effect to hydraulic turbine overspeed protection.

3. The overspeed protection and flow control method based on pumped storage power station as claimed in claim 2, characterized in that: the specific working process of the flow control system comprises the following steps:

s1, an image collection module collects image information of a downstream ship during navigation in a river channel, a data set comparison module identifies ship information in the image and counts the number N of ships, and a distance analysis module calculates the distance D between each downstream navigable ship and a hydropower station;

s2, the water pumping and electricity storage module calculates the total water pumping power load Y required by the hydraulic turbine set according to the calculation result of the channel analysis module;

s3, detecting the motor rotation temperature T of each water turbine by the temperature detection module, and analyzing the temperature rise condition T of each water turbine by the temperature difference analysis module;

and S4, under the condition that the total power consumption of the pumping flow is Y, the power distribution module adjusts the single-machine working current I of each water turbine according to the temperature rise condition of each water turbine.

4. The pumped-storage power station-based overspeed protection and flow control method according to claim 3, wherein: the specific working process of the channel analysis module in the step S1 includes the following steps:

s1-1, installing image collection modules on two banks of a downstream river channel, and collecting ship information of river channel navigation;

s1-2, storing the ship image by the data set comparison module, comparing the ship information in the image with the stored information by the data set comparison module, identifying ships in the river channel for navigation, and counting the number N of the ships;

s1-3, analyzing the distance D between each ship and the lower water reservoir in the river navigation image by a distance analysis module_iWhere i is 1,2,3, … …, N.

5. The pumped-storage power station-based overspeed protection and flow control method according to claim 4, wherein: the river course analysis module calculates the ship redundancy W of the river course according to the number and the distance of ships, and specifically comprises the following steps:whereinThe average distance between each shipping vessel and the lower reservoir.

6. The pumped-storage power station-based overspeed protection and flow control method according to claim 5, wherein: the specific working process of the water pumping power storage module in the step S2 includes the following steps:

s2-1, when the load of the power system is lower than the basic load, the pumped storage power station uses the power Y of the hydraulic turbine set according to the redundant power generation capacity₀Pumping water from the downstream reservoir to the upstream reservoir;

s2-2, adjusting the total working power Y of the hydraulic turbine set by the water pumping and power storage module according to the redundancy of the downstream river channel ship, and specifically:

wherein W is the redundancy degree of the river channel ship, and mu is a load coefficient, and is related to the regulation of the working power of the water turbine set through the redundancy degree of the ship.

7. The pumped-storage power station-based overspeed protection and flow control method according to claim 6, wherein: the specific work engineering of the overspeed analysis module in step S3 includes the following steps:

s3-1, when the pump turbine pumps water, the temperature detection module detects the motor working temperature t of each turbine_iI is 1,2,3, … …, n, wherein n is the working number of the water turbine;

s3-2, the temperature difference analysis module counts the environment temperature K of the water turbine during working, and calculates the difference T between the working temperature of the motor and the environment temperature_i＝t_i-K。

8. The pumped-storage power station-based overspeed protection and flow control method according to claim 7, wherein: the specific operation process of the power distribution module in step S4 includes the following steps:

s4-1, initial current I of each water turbine load module₀To pump water and storeCan work, I₀The conditions are required to be satisfied:wherein R is the load resistance of the water turbine load module;

s4-2, the temperature difference analysis module judges whether the temperature of the motor is too high, and when the temperature of the motor is too high, the difference value T is_iGreater than the system preset value T₀When the temperature difference analysis module is used, whether the motor is heated too high or not needs to be operated in a low-power mode, and when the difference value T is larger than a preset value_iLess than the system preset value T₀In the time, the temperature difference analysis module ensures that the motor is normal in temperature and needs to operate in a high-power mode to make up for the shortage of water pumping amount;

and S4-3, the power distribution module adjusts the single-machine working current I of each water turbine load module according to the result of the temperature difference analysis module.

9. The pumped-storage power station-based overspeed protection and flow control method according to claim 8, wherein: the power distribution module adjusts the stand-alone working current I of each water turbine load module, and specifically comprises the following steps:

wherein I_maxIs the maximum operating current, k, of the water turbine₁，k₂Are flow coefficients related to the calculation of the turbine operating current from the temperature difference, k₁，k₂Need to satisfy

10. The pumped-storage power station-based overspeed protection and flow control method according to claim 9, wherein: the water pumping power storage module comprises a manual control unit, and the manual control unit is used for manually adjusting the water pumping amount of the water turbine.

Technical Field

The invention relates to the technical field of pumped storage, in particular to an overspeed protection and flow control method based on a pumped storage power station.

Background

When the load of a power system of the pumped storage power station is lower than the basic load, a water pump turbine of the power station can be used as a water pump, and water is pumped from a downstream reservoir to an upstream reservoir by utilizing redundant power generation capacity to store energy in a potential energy form; when the system load is higher than the basic load, the system can be used as a water turbine to generate electricity to adjust the peak load. Therefore, the pure pumped storage power station cannot increase the electric quantity of the power system, but can improve the operation economy of the thermal generator set and improve the total efficiency of the power system, so that the pumped storage unit is generally regarded and rapidly developed in all countries around the world.

However, when water is pumped from a downstream reservoir, the water level is rapidly reduced, when a downstream voyage section is converted from a reservoir area to a natural voyage section, the navigation environment is gradually complicated, a channel at the tail end of backwater is narrowed, the water potential flow state is gradually disordered, and shoals are increased, when the water level is reduced, a ship does not fully master water level change information, accidents such as breakage and runaway drifting of a ship cable, anchor walking of the ship and the like are induced by not timely adjusting the cable, an anchor chain, a gangway and the like, or originally familiar reference objects on two banks are changed, and when the reference objects of each water level are not mature or the reference objects on the banks are sparsely cared for the shape and the rocks of the ship, the ship is very easy to touch reefs and touch the bank dangerous situations. Therefore, it is necessary to design an overspeed protection and flow control method based on a pumped storage power station for controlling pumped storage power station pumped flow according to a downstream channel ship.

Disclosure of Invention

The invention aims to provide an overspeed protection and flow control method based on a pumped storage power station, so as to solve the problems in the background technology.

In order to solve the technical problems, the invention provides the following technical scheme: the method integrally adopts a flow control system, the flow control system comprises a channel analysis module, an overspeed analysis module and a pumped storage module, the channel analysis module is used for observing passing ships of a channel of the pumped storage power station, the overspeed analysis module is used for detecting abnormal temperature rise conditions of a water turbine with too high rotating speed, and the pumped storage module is used for pumping water from a downstream reservoir to an upstream reservoir through a water pump turbine set to store energy in a potential energy form.

According to the technical scheme, the channel analysis module comprises an image collection module, a data set comparison module and a distance analysis module, the overspeed analysis module comprises a temperature detection module and a temperature difference analysis module, the water pumping and electricity storage module comprises a water turbine load module and an electric power distribution module, and the temperature difference analysis module is electrically connected with the electric power distribution module;

the image collection module is used for gathering channel information, the data set is compared the module and is used for discerning the ship on the channel, the data set is compared the module and is used for comparing image information, the navigation ship in the discernment image, distance analysis module is used for calculating each navigation ship of reservoir low reaches and power station distance, temperature detection module is used for detecting the motor temperature when the hydraulic turbine load rotates, temperature difference analysis module is used for judging the intensification condition of motor, hydraulic turbine load module is used for drawing water to the upper reaches reservoir from the low reaches through the hydraulic turbine, electric power distribution module is used for adjusting the rotational speed load according to the temperature condition of hydraulic turbine and reaches the effect to hydraulic turbine overspeed protection.

According to the technical scheme, the specific working process of the flow control system comprises the following steps:

s1, an image collection module collects image information of a downstream ship during navigation in a river channel, a data set comparison module identifies ship information in the image and counts the number N of ships, and a distance analysis module calculates the distance D between each downstream navigable ship and a hydropower station;

s2, the water pumping and electricity storage module calculates the total water pumping power load Y required by the hydraulic turbine set according to the calculation result of the channel analysis module;

s3, detecting the motor rotation temperature T of each water turbine by the temperature detection module, and analyzing the temperature rise condition T of each water turbine by the temperature difference analysis module;

and S4, under the condition that the total power consumption of the pumping flow is Y, the power distribution module adjusts the single-machine working current I of each water turbine according to the temperature rise condition of each water turbine.

According to the above technical solution, the specific working process of the channel analysis module in the step S1 includes the following steps:

s1-1, installing image collection modules on two banks of a downstream river channel, and collecting ship information of river channel navigation;

s1-2, storing the ship image by the data set comparison module, comparing the ship information in the image with the stored information by the data set comparison module, identifying ships in the river channel for navigation, and counting the number N of the ships;

s1-3, analyzing the distance D between each ship and the lower water reservoir in the river navigation image by a distance analysis module_iWhere i is 1,2,3, … …, N.

According to the technical scheme, the river channel analysis module calculates the ship redundancy W of the river channel according to the number and the distance of ships, and specifically comprises the following steps:whereinThe average distance between each shipping vessel and the lower reservoir.

According to the above technical solution, the specific working process of the water pumping power storage module in the step S2 includes the following steps:

s2-1, when the load of the power system is lower than the basic load, the pumped storage power station uses the power Y of the hydraulic turbine set according to the redundant power generation capacity₀Pumping water from the downstream reservoir to the upstream reservoir;

s2-2, adjusting the total working power Y of the hydraulic turbine set by the water pumping and power storage module according to the redundancy of the downstream river channel ship, and specifically:

wherein W is the redundancy degree of the river channel ship, and mu is a load coefficient, and is related to the regulation of the working power of the water turbine set through the redundancy degree of the ship.

According to the above technical solution, the specific work engineering of the overspeed analysis module in the step S3 includes the following steps:

s3-1, when the pump turbine pumps water, the temperature detection module detects the motor working temperature t of each turbine_iI is 1,2,3, … …, n, wherein n is the working number of the water turbine;

s3-2, the temperature difference analysis module counts the environment temperature K of the water turbine during working, and calculates the difference T between the working temperature of the motor and the environment temperature_i＝t_i-K。

According to the above technical solution, the specific working process of the power distribution module in the step S4 includes the following steps:

s4-1, initial current I of each water turbine load module₀To perform pumped storage work I₀The conditions are required to be satisfied:wherein R is the load resistance of the water turbine load module;

s4-2, the temperature difference analysis module judges whether the temperature of the motor is too high, and when the temperature of the motor is too high, the difference value T is_iGreater than the system preset value T₀When the temperature difference analysis module is used, whether the motor is heated too high or not needs to be operated in a low-power mode, and when the difference value T is larger than a preset value_iLess than the system preset value T₀In the time, the temperature difference analysis module ensures that the motor is normal in temperature and needs to operate in a high-power mode to make up for the shortage of water pumping amount;

and S4-3, the power distribution module adjusts the single-machine working current I of each water turbine load module according to the result of the temperature difference analysis module.

According to the technical scheme, the power distribution module adjusts the single-machine working current I of each water turbine load module, and the method specifically comprises the following steps:

wherein I_maxIs the maximum operating current, k, of the water turbine₁，k₂Are flow coefficients related to the calculation of the turbine operating current from the temperature difference, k₁，k₂Need to satisfy

According to the technical scheme, the water pumping power storage module comprises a manual control unit, and the manual control unit is used for manually adjusting the water pumping amount of the water turbine.

Compared with the prior art, the invention has the following beneficial effects: according to the invention, the speed of pumped storage is adjusted according to the number of ships at the conversion position from the lower reservoir to the natural water channel, so that the ships have more reaction time, the risk of the ships caused by too fast water level drop is avoided, the water turbine is protected from overspeed according to the temperature of the water turbine, and the service life of the water turbine is prolonged under the condition of meeting the flow demand.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a system block diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: an overspeed protection and flow control method based on a pumped storage power station adopts a flow control system integrally, the flow control system comprises a channel analysis module, an overspeed analysis module and a pumped storage module, the channel analysis module is used for observing a passing ship of a channel of the pumped storage power station, the overspeed analysis module is used for detecting abnormal temperature rise condition of a water turbine with too fast rotating speed, and the pumped storage module is used for pumping water from a downstream reservoir to an upstream reservoir through a water pump turbine set to store energy in a potential energy form;

the channel analysis module comprises an image collection module, a data set comparison module and a distance analysis module, the overspeed analysis module comprises a temperature detection module and a temperature difference analysis module, the water pumping and electricity storage module comprises a water turbine load module and an electric power distribution module, and the temperature difference analysis module is electrically connected with the electric power distribution module;

the system comprises an image collection module, a data set comparison module, a temperature detection module, a temperature difference analysis module, a water turbine load module and an electric power distribution module, wherein the image collection module is used for collecting channel information, the data set comparison module is used for identifying ships on a channel, the data set comparison module is used for comparing image information and identifying navigation ships in an image, the distance analysis module is used for calculating the distance between each navigation ship at the downstream of a reservoir and a hydropower station, the temperature detection module is used for detecting the temperature of a motor when a water pump and water turbine load rotates, the temperature difference analysis module is used for judging the temperature rise condition of the motor, the water turbine load module is used for pumping water from the downstream reservoir to an upstream reservoir through the water pump and water turbine, and the electric power distribution module is used for adjusting the rotating speed load according to the temperature condition of the water turbine to achieve the effect of over-speed protection of the water turbine;

the specific working process of the flow control system comprises the following steps:

s1, an image collection module collects image information of a downstream ship during navigation in a river channel, a data set comparison module identifies ship information in the image and counts the number N of the ships, a distance analysis module calculates the distance D between each downstream navigation ship and a hydropower station, and the influence of water pumping quantity on the navigation ships is analyzed by calculating the number of the ships and the distance between the ships and a lower water reservoir;

s2, the water pumping and power storage module calculates the total water pumping power load Y required by the hydraulic turbine set according to the calculation result of the channel analysis module, when the number of ships is larger and the distance is closer, the water pumping amount is smaller, and the water level is prevented from dropping too fast due to overlarge water pumping amount to cause that the ships do not fully master water level change information, and accidents such as anchor walking, reef touch and the like of the sounding ships are not adjusted in time;

s3, the temperature detection module detects the motor rotation temperature T of each water turbine, the temperature difference analysis module analyzes the temperature rise condition T of each water turbine, and whether the water turbine rotates too fast is analyzed according to the temperature rise condition of the water turbine, so that the water turbine rotating too fast is protected;

s4, under the condition that the total power consumption meeting the requirement of pumping flow is Y, the power distribution module adjusts the single machine working current I of each water turbine according to the temperature rise condition of each water turbine, and under the condition that the total pumping quantity is not changed, the working current of each water turbine is adjusted to protect the water turbine with the over-high speed;

the specific working process of the channel analysis module in the step S1 includes the following steps:

s1-1, installing image collection modules on two banks of a downstream river channel, and collecting ship information of river channel navigation;

s1-2, storing the ship image by the data set comparison module, comparing the ship information in the image with the stored information by the data set comparison module, identifying ships in the river channel for navigation, and counting the number N of the ships;

s1-3, analyzing the distance D between each ship and the lower water reservoir in the river navigation image by a distance analysis module_iWherein i ═ 1,2,3, … …, N;

the river course analysis module calculates the ship redundancy W of the river course according to the ship quantity and the distance, and specifically comprises the following steps:whereinAnalyzing the influence of the water pumping quantity on the sailing ships by calculating the number of the ships and the distance between the ships and the lower reservoir for the average distance between each sailing ship and the lower reservoir;

the specific working process of the water pumping power storage module in the step S2 includes the following steps:

s2-1, when the load of the power system is lower than the basic load, the pumped storage power station uses the power Y of the hydraulic turbine set according to the redundant power generation capacity₀Pumping water from the downstream reservoir to the upstream reservoir;

s2-2, adjusting the total working power Y of the hydraulic turbine set by the water pumping and power storage module according to the redundancy of the downstream river channel ship, and specifically:

w is the redundancy degree of the river channel ship, and mu is a load coefficient, and is related to the regulation of the working power of the water turbine set through the redundancy of the ship, when the number of the ships is larger and the distance is closer, the water pumping quantity is smaller, so that the phenomenon that the ship does not fully master the water level change information due to too fast water level reduction caused by overlarge water pumping quantity is avoided, and accidents such as anchor walking, reef touching and the like of the ship sounding ship are not adjusted in time;

the specific work engineering of the overspeed analysis module in step S3 includes the following steps:

s3-1, when the pump turbine pumps water, the temperature detection module detects the motor working temperature t of each turbine_iI is 1,2,3, … …, n, wherein n is the working number of the water turbine;

s3-2, the temperature difference analysis module counts the environment temperature K of the water turbine during working, and calculates the difference T between the working temperature of the motor and the environment temperature_i＝t_iK, analyzing whether the water turbine rotates too fast or not according to the temperature rise condition of the water turbine, and protecting the water turbine rotating too fast;

the specific operation process of the power distribution module in step S4 includes the following steps:

s4-1, initial current I of each water turbine load module₀To perform pumped storage work I₀The conditions are required to be satisfied:wherein R is the load resistance of the water turbine load module;

s4-2, the temperature difference analysis module judges whether the temperature of the motor is too high, and when the temperature of the motor is too high, the difference value T is_iGreater than the system preset value T₀When the temperature difference analysis module is used, whether the motor is heated too high or not needs to be operated in a low-power mode, and when the difference value T is larger than a preset value_iLess than the system preset value T₀In the time, the temperature difference analysis module ensures that the motor is normal in temperature and needs to operate in a high-power mode to make up for the shortage of water pumping amount;

s4-3, the power distribution module adjusts the single-machine working current I of each water turbine load module according to the result of the temperature difference analysis module;

the single-machine working current I of each hydraulic turbine load module is adjusted to the electric power distribution module, specifically is:

wherein I_maxIs the maximum operating current, k, of the water turbine₁，k₂Are flow coefficients related to the calculation of the turbine operating current from the temperature difference, k₁，k₂Need to satisfyUnder the condition of meeting the requirement that the total water pumping quantity is not changed, the working current of each water turbine is adjusted, and the water turbine with the over-high rotating speed is protected;

the water pumping power storage module comprises a manual control unit, and the manual control unit is used for manually adjusting the water pumping amount of the water turbine.

Example 1: the image collection module is installed on two banks of a downstream river channel, the ship information of river channel navigation is collected, the data set comparison module identifies the ship of the river channel navigation, the number N of the ship at the moment is counted to be 10, and the distance analysis module is divided intoAverage distance between river channel ship and lower reservoirThe river course analysis module calculates the ship redundancy W of the river course to be 0.02 according to the number and the distance of the ships, and the hydraulic turbine set is set to have power Y₀Pumping water from a downstream reservoir to an upstream reservoir at 100 kilowatts; the water pumping and power storage module adjusts the total working power Y of a water turbine set to 92.33 kilowatts according to the redundancy of a downstream river channel ship, the water turbine set has n to 10 water turbines for water pumping, the temperature difference analysis module counts the ambient temperature K of the water turbines during working to 30 ℃, and the difference T between the ambient temperature and the temperature of the first water turbine is at the moment₁30 ℃ and above T₀20 deg.C, the initial current I of water turbine₀The power distribution module adjusts the single machine working current I of each water turbine one load module to 7.37A, and the difference T between the temperature of the water turbine two and the ambient temperature at the moment₁10 ℃ below T₀The single-machine working current I of the secondary load module of each water turbine is adjusted to 11.21A by the power distribution module at 20 ℃, and the working current of each water turbine is adjusted under the condition that the total water pumping amount is not changed, so that the water turbine with the over-high speed is protected.

Example 2: at the moment, the number N of the river channel passing ships is 100, and the distance analysis module analyzes the average distance between the river channel ship and the lower reservoirRiver course analysis module calculates the boats and ships redundancy W of river course according to boats and ships quantity and distance 0.2, and the river course ship is too much this moment, if continue to keep rated flow to draw water work and can make the ship in time adjust never take place dangers such as striking the reef in the lower water level position, consequently draw water the total operating power Y of electric power storage module with the hydraulic turbine group according to downstream river course ship redundancy 64.97 kilowatts.

Example 3: the image collection module is installed on two banks of a downstream river channel, the ship information of river channel navigation is collected, the data set comparison module identifies the ship of river channel navigation, the number N of the ship at the moment is counted to be 0, and the river channel analysis module calculates the ship of the river channel according to the number and the distance of the shipThe redundancy W is 0, namely when no ship passes through the water channel, the water turbine set uses the rated power Y₀100 kilowatts are pumped from a downstream reservoir to an upstream reservoir, the temperature difference analysis module counts the environmental temperature K of the water turbine when the water turbine works to be 30 ℃, and the difference T between the first water turbine and the environmental temperature₁40 ℃ higher than T₀20 deg.C, the initial current I of water turbine₀The power distribution module adjusts the single machine working current I of each water turbine one load module to 6.43A, and the difference T between the temperature of the water turbine two and the ambient temperature is obtained₁1 ℃ below T₀The single-machine working current I of the secondary load module of each water turbine is adjusted to 14.81A by the power distribution module at 20 ℃, and the working current of each water turbine is adjusted under the condition that the total water pumping amount is not changed, so that the water turbine with the over-high speed is protected.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.