Energy-saving method and system for water-turbine generator set

Abstract

The invention discloses an energy-saving method and system for a water-turbine generator set, and relates to the technical field of water-turbine generator set energy conservation, and the method comprises the steps that in the shutdown process of the water-turbine generator set, surplus mechanical energy of a water turbine rotor is converted into electric energy through an energy recovery and conversion system, and the electric energy is stored in an energy storage device; in the starting process of the hydraulic turbine set, an alternating magnetic field is established at the stator end of the set by using the electric energy in the energy storage device to drive the rotor of the set to rotate in an accelerated manner. The energy recovery and conversion device is used for converting mechanical energy in the shutdown process into electric energy to be stored, energy waste is greatly reduced, the collected electric energy is utilized, the electric energy is used for the startup process, an alternating magnetic field is formed on the stator, the rotating speed of the rotor is driven to rapidly rise, and the energy consumption is reduced. And the consumption of water resources in the starting process is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of water turbine generator sets, and in particular to an energy-saving method and system for water turbine generator sets. Background Art

[0002] Hydroelectric generator sets are widely used in the field of hydropower generation. As the core equipment for converting water energy into electrical energy, the operating efficiency of hydroelectric generator sets has an important impact on the energy utilization and economy of the entire power generation system. In traditional hydroelectric generator sets, the shutdown and startup processes are usually accompanied by a large amount of energy loss. In particular, during the shutdown process, the mechanical energy of the rotor is not effectively recovered. During the startup process, the unit relies on the supply of water energy to accelerate the rotation of the rotor, lacking an effective energy recycling mechanism. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the technical problem solved by the present invention is that in traditional hydro-turbine generator sets, the shutdown and startup processes are usually accompanied by a large amount of mechanical energy that cannot be effectively recovered. During the startup process, the unit relies on the supply of water energy to accelerate the rotation of the rotor and lacks an effective energy recycling mechanism.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for energy saving of a hydro-turbine generator set, which comprises converting the surplus mechanical energy of a turbine rotor into electrical energy by using an energy recovery and conversion system during the shutdown process of the hydro-turbine set, and storing the electrical energy in an energy storage device;

[0007] During the startup process of the turbine unit, the electrical energy in the energy storage device is used to establish an alternating magnetic field at the stator end of the unit, driving the unit's rotor to rotate faster.

[0008] As a preferred solution of the energy-saving method of the hydro-generator set of the present invention, the energy recovery and conversion system is used to convert the surplus mechanical energy of the turbine rotor into electrical energy, including:

[0009] Through the energy recovery efficiency optimization algorithm, the instantaneous speed of the turbine rotor is monitored in real time, and the working state of the energy conversion device is dynamically adjusted to realize the conversion of the rotor's surplus mechanical energy into electrical energy.

[0010] As a preferred solution of the energy-saving method for a hydro-generator set of the present invention, the energy recovery efficiency optimization algorithm includes:

[0011] Monitor the instantaneous speed of the turbine rotor in real time, using the speed data fed back by the sensor as the input parameter;

[0012] According to the different stages of the speed, the electromagnetic field strength and load matching of the energy conversion device are dynamically adjusted to ensure that the energy conversion efficiency is always at the highest level;

[0013] When the speed is higher than a predetermined threshold, the electromagnetic field strength is increased to improve the efficiency of electric energy conversion. When the speed drops to a critical value, the electromagnetic field strength is reduced to prevent excessive braking or invalid energy loss.

[0014] As a preferred solution of the energy-saving method of the hydro-generator set of the present invention, the electric energy in the energy storage device is utilized, including:

[0015] Evaluate the remaining electrical energy in the energy storage device and calculate the required electrical energy output based on the instantaneous speed and acceleration requirements when the unit is started;

[0016] Control the frequency and voltage of the electric energy output to form an alternating magnetic field suitable for the current speed at the stator end of the unit;

[0017] When the speed gradually increases and approaches the rated speed, the power output is gradually reduced to allow the unit to accelerate smoothly.

[0018] As a preferred solution of the energy-saving method for a hydro-turbine generator set of the present invention, it also includes dynamically managing the electric energy released by the energy storage device during the startup of the set by the control system, and gradually reducing the electric energy release rate when the rotor speed gradually increases to 80% of the rated speed.

[0019] As a preferred solution of the energy-saving method of the hydro-generator set of the present invention, it also includes:

[0020] During the entire startup and shutdown process, the charging and discharging rates of the energy storage device are dynamically adjusted according to the current power, charging demand and discharging demand of the energy storage device.

[0021] As a preferred solution of the energy-saving method for a hydro-generator set of the present invention, the energy recovery efficiency optimization algorithm further includes:

[0022] During the shutdown of the turbine unit, the braking effect of the energy conversion device is used to gradually reduce the rotational inertia of the rotor by adjusting the magnetic field strength and load;

[0023] When the speed drops below the set threshold, the energy recovery mode is turned off and the system switches to the traditional shutdown process.

[0024] Another object of the present invention is to provide an energy-saving system for a hydro-turbine generator set, which can dynamically adjust the charge and discharge rates of the energy storage device according to the current power, charging demand and discharging demand of the energy storage device during the entire start-up and shutdown process, thereby solving the problem that the current hydro-turbine generator set lacks an effective energy recycling mechanism.

[0025] As a preferred solution of the energy-saving system of the hydro-generator set of the present invention, it includes: a shutdown control module, a startup control module, and a full-process control module;

[0026] The shutdown control module is used to convert the surplus mechanical energy of the turbine rotor into electrical energy by using the energy recovery and conversion system during the shutdown process of the turbine unit, and store it in the energy storage device;

[0027] The startup control module is used to use the electrical energy in the energy storage device to establish an alternating magnetic field at the stator end of the unit during the startup process of the turbine unit, thereby driving the unit rotor to rotate faster;

[0028] The full-process control module is used to dynamically adjust the charge and discharge rate of the energy storage device according to the current power, charging demand and discharging demand of the energy storage device during the entire start-up and shutdown process.

[0029] A computer device comprises a memory and a processor. The memory stores a computer program. The processor executes the computer program to implement a method for energy saving of a hydro-generator set.

[0030] A computer-readable storage medium stores a computer program, which implements the steps of a method for energy saving of a hydro-generator set when the computer program is executed by a processor.

[0031] The beneficial effects of the present invention are as follows: the mechanical energy during the shutdown process is converted into electrical energy for storage by using an energy recovery conversion device, which greatly reduces energy waste, and the collected electrical energy is utilized to use the electrical energy in the startup process, forming an alternating magnetic field on the stator, driving the rotor speed to rise rapidly, and greatly reducing the consumption of water resources during the startup process. Furthermore, the charging current and voltage are dynamically adjusted according to the power, voltage and temperature state of the energy storage device to ensure that the charging rate can be automatically reduced under high power or high temperature conditions, avoiding the risks of overcharging and over-temperature, significantly improving the charging efficiency and system safety, and extending the service life of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0033] Figure 1 Schematic diagram of energy recovery during the shutdown process of the turbine unit.

[0034] Figure 2 This is the energy recovery control logic block diagram.

[0035] Figure 3 This is a schematic diagram of the energy output of the energy storage device during the startup process of the turbine unit.

[0036] Figure 4 Energy output control logic block diagram for energy storage device

[0037] Figure 5 It is a schematic diagram of the overall device of the computer. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0041] Example

[0042] Reference Figures 1 to 5 , which is an embodiment of the present invention, provides a method for energy saving of a hydro-generator set, comprising:

[0043] S1: During the shutdown of the turbine unit, the energy recovery and conversion system is used to convert the surplus mechanical energy of the turbine rotor into electrical energy and store it in the energy storage device. The energy recovery and conversion system includes an energy conversion device, a charge and discharge switch, an energy storage device, a magnetic pole, cables connecting various parts, and a timer. The timer records the duration of the charge and discharge switch and the entire energy recovery and conversion system. By setting the safety duration, the charge and discharge switch can be forcibly disconnected in conjunction with the control system to improve the safety of the turbine generator.

[0044] It should be noted that the energy conversion device mainly includes a power generation device and an inverter, and the two ends of the energy conversion device are respectively connected to the charge-discharge switch and the energy storage device, which is used to realize the function of converting mechanical energy into electrical energy or inverting direct current into alternating current; the stator magnetic poles of the hydro-turbine generator set are used as the magnetic poles of the power generation device to provide a magnetic field for the power generation device and establish an alternating magnetic field; the energy storage device is used to store electrical energy; the closing and opening of the charge-discharge switch controls the input and exit of the entire energy recovery and conversion system. When the hydro-turbine generator is shut down, the charge-discharge switch is closed, and the energy conversion device starts the energy recovery mode; when the hydro-turbine generator is started, the charge-discharge switch is closed, and the energy conversion device starts the AC output mode.

[0045] It should be further explained that it also includes a control system, which controls the closing and opening of the charge and discharge switch by obtaining the opening and closing signals of the circuit breaker at the generator set outlet and comparing the real-time speed of the turbine, and controls the function of the energy conversion device and the mode switching according to the actual situation to realize the forced opening of the charge and discharge switch;

[0046] Furthermore, the excess mechanical energy of the turbine rotor is converted into electrical energy using an energy recovery and conversion system, including:

[0047] Through the energy recovery efficiency optimization algorithm, the instantaneous speed of the turbine rotor is monitored in real time, and the working state of the energy conversion device is dynamically adjusted to realize the conversion of the rotor's surplus mechanical energy into electrical energy.

[0048] Furthermore, the energy recovery efficiency optimization algorithm includes,

[0049] Monitor the instantaneous speed of the turbine rotor in real time, using the speed data fed back by the sensor as the input parameter;

[0050] According to the different stages of the speed, the electromagnetic field strength and load matching of the energy conversion device are dynamically adjusted to ensure that the energy conversion efficiency is always at the highest level;

[0051] When the speed is higher than a predetermined threshold, the electromagnetic field strength is increased to improve the efficiency of electric energy conversion. When the speed drops to a critical value, the electromagnetic field strength is reduced to prevent excessive braking or invalid energy loss.

[0052] When using, refer to the attached Figure 2When the shutdown process of the turbine unit begins, the control system receives the trip signal of the turbine unit outlet circuit breaker, and the charge-discharge switch is closed. At this time, the energy conversion device is put into energy storage mode, which converts the mechanical energy of the generator rotor into electrical energy and stores it in the energy storage device. When the control system receives a signal that the speed of the generator set is less than 20% of the rated speed or the brake wind gate is put into use, the charge-discharge switch is disconnected, the energy storage process ends, and the generator enters the traditional shutdown process. Furthermore, when the control system receives a signal that the timer reaches the set safety time limit, the charge-discharge switch is forced to disconnect and the energy storage process ends.

[0053] Furthermore, the energy recovery efficiency optimization algorithm also includes:

[0054] During the shutdown of the turbine unit, the braking effect of the energy conversion device is used to gradually reduce the rotational inertia of the rotor by adjusting the magnetic field strength and load;

[0055] When the speed drops below the set threshold, the energy recovery mode is turned off and the system switches to the traditional shutdown process.

[0056] S2: During the startup of the turbine unit, the electrical energy in the energy storage device is used to establish an alternating magnetic field at the stator end of the unit, driving the unit's rotor to rotate faster.

[0057] Further, utilizing the electric energy in the energy storage device includes,

[0058] Evaluate the remaining electrical energy in the energy storage device and calculate the required electrical energy output based on the instantaneous speed and acceleration requirements when the unit is started;

[0059] The frequency and voltage of the power output are controlled to form an alternating magnetic field suitable for the current speed at the stator end of the unit; when the speed gradually increases and approaches the rated speed, the power output is gradually reduced to allow the unit to accelerate smoothly.

[0060] Furthermore, the electric energy released by the energy storage device during the startup of the unit is dynamically managed by the control system, and when the rotor speed gradually increases to 80% of the rated speed, the electric energy release rate is gradually reduced.

[0061] When using, refer to the attached Figure 4When the turbine start-up process begins, the control system receives the turbine ball valve fully open signal and the energy storage device ready signal, and the charge and discharge switch is closed. At this time, the energy conversion device is put into the power output mode, which inverts the electric energy in the energy storage device into AC power and outputs it to the stator end of the generator set. The generator stator forms an alternating magnetic field, driving the generator rotor to rotate faster. When the control system receives a signal that the speed of the generator set is greater than 80% of the rated speed, the charge and discharge switch is disconnected, the energy output process ends, and the generator enters the traditional start-up process. Furthermore, considering the service life of the energy storage device, when the power of the energy storage device is lower than the set low power protection value, the charge and discharge switch is disconnected, the power output process ends, and the generator enters the traditional start-up process.

[0062] S3: During the entire startup and shutdown process, the charge and discharge rates of the energy storage device are dynamically adjusted according to the current power, charging demand and discharging demand of the energy storage device.

[0063] Furthermore, dynamically adjusting the charge and discharge rate of the energy storage device according to the current power, charging demand and discharging demand of the energy storage device includes:

[0064] During the energy storage process, the charging current and voltage are dynamically adjusted according to the current power, voltage level and temperature state of the energy storage device, which can be expressed as:

[0065]

[0066] Among them, I c (t) is the charging current at time t; I max is the maximum allowable charging current; Q(t) is the remaining capacity of the energy storage device at time t; Q max is the maximum capacity of the energy storage device; V(t) is the voltage of the energy storage device at time t; V max is the maximum voltage of the energy storage device; T(t) is the temperature of the energy storage device at time t; T safe is the safety temperature threshold of the energy storage device;

[0067] It should be noted that according to the state feedback of power, voltage and temperature, the influence of different state variables on the charging current is smoothed by exponential function to ensure a smoother and more efficient charging process. The relationship between power, voltage and temperature is expressed as an additive combination in the formula. If a state is more extreme (such as excessive temperature), it will significantly affect the charging current and reduce it, thereby avoiding damage to the energy storage device.

[0068] During shutdown, the charging rate is gradually adjusted according to the speed of energy recovery and the current state of the energy storage device, which is expressed as: preventing overcharging or damage caused by fast charging;

[0069]

[0070] Among them, I charge (t) is the charging current at time t, the charging rate adjusted for energy recovery; P recover (t) is the energy recovery power at time t, which comes from the energy recovery system; V(t) is the voltage of the energy storage device at time t; Q(t) is the charge of the energy storage device at time t; Q max is the maximum power of the energy storage device; T(t) is the temperature of the energy storage device at time t; T max is the maximum safe temperature of the energy storage device;

[0071] It should be noted that through The charging rate is adjusted to gradually approach 1 when the battery is close to full charge, which significantly reduces the charging current and avoids damaging the energy storage device due to over-rapid charging of high power. Compared with traditional linear control, nonlinear functions can more effectively control the charging rate. Temperature feedback is achieved through To control the charging rate, when the temperature approaches the upper limit T max When the charging current drops rapidly, the energy storage device is protected.

[0072] During the startup process, according to the acceleration requirements of the unit rotor, the discharge current of the energy storage device is controlled to ensure stable output, and the output current is gradually reduced when the speed reaches the preset value, which is expressed as:

[0073]

[0074] Among them, I d (t) is the discharge current at time t; J is the moment of inertia of the turbine rotor; V(t) is the voltage of the energy storage device at time t; ΔN r (t) is the speed change at time t; Δt is the time interval; N targe is the target speed of the unit.

[0075] It should be noted that during the startup acceleration phase, the moment of inertia J reflects the rotor's resistance to speed changes and determines the energy demand during acceleration. By combining the speed change ΔNr(t) and the rotor inertia, the system can dynamically adjust the discharge current to ensure that the electric energy is accurately matched to the demand during acceleration. The control method based on inertial feedback effectively avoids excessive energy release and system overload, and gradually reduces the current when the speed approaches the target value through an exponential decreasing function to ensure smooth operation of the system, which greatly improves the energy utilization efficiency of the system during the acceleration phase, reduces energy waste, and extends the service life of the energy storage device and unit equipment.

[0076] In summary, the present invention utilizes an energy recovery conversion device to convert mechanical energy during shutdown into electrical energy for storage, which greatly reduces energy waste, and utilizes the collected electrical energy to use it in the startup process, forming an alternating magnetic field on the stator, driving the rotor speed to rise rapidly, and greatly reducing the consumption of water resources during the startup process. Furthermore, according to the power, voltage, and temperature state of the energy storage device, the charging current and voltage are dynamically adjusted to ensure that the charging rate can be automatically reduced under high power or high temperature conditions, avoiding the risks of overcharging and over-temperature, significantly improving the charging efficiency and system safety, and extending the service life of the energy storage device.

[0077] The above is a schematic scheme of a method for energy saving of a hydro-turbine generator set in this embodiment. It should be noted that the technical scheme of the system for energy saving of the hydro-turbine generator set and the technical scheme of the method for energy saving of the hydro-turbine generator set described above are of the same concept, and the details of the technical scheme of the system for energy saving of the hydro-turbine generator set in this embodiment that are not described in detail can all be referred to the description of the technical scheme of the method for energy saving of the hydro-turbine generator set described above.

[0078] This embodiment also provides a water turbine generator set energy saving system, including:

[0079] Including shutdown control module, startup control module and full-process control module;

[0080] The shutdown control module is used to convert the surplus mechanical energy of the turbine rotor into electrical energy by using the energy recovery and conversion system during the shutdown process of the turbine unit, and store it in the energy storage device;

[0081] The startup control module is used to use the electrical energy in the energy storage device to establish an alternating magnetic field at the stator end of the unit during the startup process of the turbine unit, thereby driving the unit rotor to rotate faster;

[0082] The full-process control module is used to dynamically adjust the charge and discharge rate of the energy storage device according to the current power, charging demand and discharging demand of the energy storage device during the entire start-up and shutdown process.

[0083] This embodiment also provides a computing device, which is applicable to energy saving of a hydro-generator set, and includes:

[0084] Memory and processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the energy-saving method for a hydro-generator set as proposed in the above embodiment.

[0085] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for realizing energy saving of a hydro-turbine generator set as proposed in the above embodiment is implemented.

[0086] The storage medium proposed in this embodiment and the method for realizing energy saving of a hydro-turbine generator set proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0087] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (RandomAccess Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0088] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0089] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0090] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0091] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limited. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0092] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for energy saving of a hydro-generator set, characterized in that: include, During the shutdown of the turbine unit, the energy recovery and conversion system is used to convert the surplus mechanical energy of the turbine rotor into electrical energy and store it in the energy storage device; During the startup process of the turbine unit, the electrical energy in the energy storage device is used to establish an alternating magnetic field at the stator end of the unit, driving the unit's rotor to rotate faster.

2. The energy-saving method for a hydro-generator set according to claim 1, characterized in that: The energy recovery and conversion system is used to convert the surplus mechanical energy of the turbine rotor into electrical energy. include, Through the energy recovery efficiency optimization algorithm, the instantaneous speed of the turbine rotor is monitored in real time, and the working state of the energy conversion device is dynamically adjusted to realize the conversion of the rotor's surplus mechanical energy into electrical energy.

3. The energy-saving method for a hydro-generator set according to claim 2, characterized in that: The energy recovery efficiency optimization algorithm includes: Monitor the instantaneous speed of the turbine rotor in real time, using the speed data fed back by the sensor as the input parameter; According to the different stages of the speed, the electromagnetic field strength and load matching of the energy conversion device are dynamically adjusted to ensure that the energy conversion efficiency is always at the highest level; When the speed is higher than a predetermined threshold, the electromagnetic field strength is increased to improve the efficiency of electric energy conversion. When the speed drops to a critical value, the electromagnetic field strength is reduced to prevent excessive braking or invalid energy loss.

4. The energy-saving method for a hydro-generator set according to claim 3, characterized in that: The electric energy in the energy storage device is utilized, include, Evaluate the remaining electrical energy in the energy storage device and calculate the required electrical energy output based on the instantaneous speed and acceleration requirements when the unit is started; Control the frequency and voltage of the electric energy output to form an alternating magnetic field suitable for the current speed at the stator end of the unit; When the speed gradually increases and approaches the rated speed, the power output is gradually reduced to allow the unit to accelerate smoothly.

5. The energy-saving method for a hydro-generator set according to claim 4, characterized in that: It also includes that the electric energy released by the energy storage device during the startup process of the unit is dynamically managed by the control system, and when the rotor speed gradually increases to 80% of the rated speed, the electric energy release rate is gradually reduced.

6. The energy-saving method for a hydro-generator set according to claim 5, characterized in that: The energy recovery efficiency optimization algorithm also includes: During the shutdown of the turbine unit, the braking effect of the energy conversion device is used to gradually reduce the rotational inertia of the rotor by adjusting the magnetic field strength and load; When the speed drops below the set threshold, the energy recovery mode is turned off and the system switches to the traditional shutdown process.

7. The energy-saving method for a hydro-generator set according to any one of claims 1 to 6, characterized in that: Also includes, During the entire startup and shutdown process, the charging and discharging rates of the energy storage device are dynamically adjusted according to the current power, charging demand and discharging demand of the energy storage device.

8. A system using the energy-saving method for a hydro-generator set as claimed in any one of claims 1 to 7, characterized in that: Including shutdown control module, startup control module and full-process control module; The shutdown control module is used to convert the surplus mechanical energy of the turbine rotor into electrical energy by using the energy recovery and conversion system during the shutdown process of the turbine unit, and store it in the energy storage device; The startup control module is used to use the electric energy in the energy storage device to establish an alternating magnetic field at the stator end of the unit during the startup process of the turbine unit, thereby driving the unit rotor to rotate faster; The overall control module is used to dynamically adjust the charge and discharge rates of the energy storage device according to the current power, charging demand and discharging demand of the energy storage device during the entire start-up and shutdown process.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the energy-saving method for a hydro-generator set according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for energy saving of a hydro-generator set according to any one of claims 1 to 7 are implemented.

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