Method for eliminating active power and water conductance swing amplitude fluctuation of pumped storage unit

Abstract

One or more embodiments of the present specification provide a method for eliminating fluctuations in active power and water conductance swing amplitude of a pumped storage unit. When the unit is in a phase adjustment condition and the volute pressure relief valve is open, when it is determined that the active power and water conductance swing amplitude fluctuate, the opening of the target valve is first adjusted to the initial opening so that the fluctuations in active power and water conductance swing amplitude disappear. Under the initial opening, the air replenishment interval of the air replenishment valve is determined. If the air replenishment interval is less than the interval threshold, the initial opening is adjusted to the target opening so that the target valve, under the target opening, the fluctuations in active power and water conductance swing amplitude disappear, and the air replenishment interval reaches the interval threshold. This embodiment adjusts the opening of the target valve so that the fluctuations in active power and water conductance swing amplitude disappear, and the air replenishment interval is more reasonable, thereby ensuring safe and stable operation of the unit under the phase adjustment condition.

Description

Technical Field

[0001] One or more embodiments of the present specification relate to the field of pumped storage technology, and in particular to a method for eliminating fluctuations in active power and water conductance swing amplitude of a pumped storage unit. Background Art

[0002] When the pumped storage unit is in steady-state operation under pumping phase adjustment or power generation phase adjustment conditions, the movable guide vane and the main water inlet valve are in a closed state, the phase adjustment water pressure system keeps the runner chamber full of gas, and the pump turbine runner rotates in the air to reduce active power loss and improve the operating stability of the unit. When the unit is in phase adjustment operation, the cooling water from the upper and lower labyrinth rings and the water in the volute that leaks into the runner chamber through the end surface gap of the guide vane will accumulate between the runner and the movable guide vane, and form a water ring under the action of the centrifugal force of the runner rotation. The formation of the water ring is conducive to the air in the runner chamber not escaping, thereby reducing the amount of air required for the unit to operate under phase adjustment conditions. However, if the water ring is too thick, the runner blades will collide with the water ring, and the active power and water guide swing amplitude will fluctuate greatly, increasing the active power loss, affecting the stable performance of the unit, and even causing the risk of runner damage. Therefore, it is necessary to eliminate the fluctuations in active power and water guide swing amplitude to ensure the operating stability of the unit. Summary of the invention

[0003] In view of this, the purpose of one or more embodiments of this specification is to propose a method for eliminating active power and water conductance swing amplitude fluctuations of a pumped storage unit, which can eliminate active power and water conductance swing amplitude fluctuations and ensure the operating stability of the unit.

[0004] Based on the above purpose, one or more embodiments of this specification provide a method for eliminating fluctuations in active power and water conductance swing amplitude of a pumped storage unit. A target valve is provided on the connecting pipeline between the volute and the tailwater pipe. When the unit is in a phase adjustment condition and the volute pressure relief valve and its isolation valve are open, when it is determined that there are fluctuations in active power and water conductance swing amplitude, the method includes:

[0005] The opening of the target valve is adjusted to the initial opening so that the fluctuations of the active power and the water conductance swing amplitude disappear;

[0006] The target valve determines the air supply interval of the air supply valve under the initial opening;

[0007] When the air replenishment interval is less than a preset interval threshold, the initial opening is reduced to a target opening so that at the target opening, fluctuations in active power and water conductance swing amplitude of the target valve disappear and the air replenishment interval reaches the interval threshold.

[0008] Optionally, adjusting the opening of the target valve to an initial opening so that the fluctuations of the active power and the water conductance swing amplitude disappear includes:

[0009] The opening of the target valve is adjusted to a first opening, and it is determined whether fluctuations in active power and water conductance swing amplitude exist;

[0010] If there are fluctuations in the active power and the water conductance swing amplitude, the opening is increased according to the preset adjustment amount starting from the first opening until the fluctuations in the active power and the water conductance swing amplitude disappear, and the opening corresponding to the disappearance of the fluctuations in the active power and the water conductance swing amplitude is used as the initial opening.

[0011] Optionally, the air supply interval of the air supply valve is determined when the target valve is at an initial opening, including:

[0012] When the target valve is at an initial opening, obtaining the opening time point and closing time point of the air supply valve;

[0013] The time interval between the last closing time point and the current opening time point of the air supply valve is used as the air supply interval.

[0014] Optionally, the method further comprises:

[0015] When the unit is in other operating conditions except the phase adjustment condition, the target valve maintains the target opening.

[0016] Optionally, the target valve is a volute drain valve or an isolation valve of a volute pressure relief valve close to the volute side.

[0017] Optionally, if the volute drain valve and the volute pressure-smoothing valve are provided on the connecting pipeline, the target valve is an isolation valve on the volute pressure-smoothing valve close to the volute side.

[0018] Optionally, the first opening degree is 2%, and the adjustment amount is 2%.

[0019] Optionally, the interval threshold is greater than 15 minutes.

[0020] The embodiment of this specification also provides a device for eliminating the fluctuation of active power and water conductance swing amplitude of a pumped storage unit, wherein a target valve is provided on the connecting pipeline between the volute and the tailwater pipe, and the device comprises:

[0021] The initial opening adjustment module is used to adjust the opening of the target valve to the initial opening when it is determined that the active power and the water conductance swing amplitude fluctuate when the unit is in a phase adjustment condition and the volute pressure relief valve is open, so that the fluctuations of the active power and the water conductance swing amplitude disappear;

[0022] An air supply interval determination module, used to determine the air supply interval of the air supply valve when the target valve is at an initial opening;

[0023] The target opening adjustment module is used to adjust the initial opening to the target opening when the air replenishment interval is less than a preset interval threshold, so that the fluctuations of the active power and the water conductance swing amplitude of the target valve disappear at the target opening, and the air replenishment interval reaches the interval threshold.

[0024] From the above description, it can be seen that the method and device for eliminating the fluctuation of active power and water conductance swing amplitude provided by one or more embodiments of the present specification is that when the unit is in the phase adjustment condition and the volute pressure relief valve and its isolation valve are open, when it is determined that the active power and water conductance swing amplitude fluctuate, the opening of the target valve is first adjusted to the initial opening so that the fluctuation of active power and water conductance swing amplitude disappears. Under the initial opening, the air replenishment interval of the air replenishment valve is determined. If the air replenishment interval is less than the interval threshold, the initial opening is adjusted to the target opening so that the target valve is under the target opening, the fluctuation of active power and water conductance swing amplitude disappears, and the air replenishment interval reaches the interval threshold. In this embodiment, by adjusting the opening of the target valve, the fluctuation of active power and water conductance swing amplitude disappears, and the air replenishment interval is more reasonable, thereby ensuring the safe and stable operation of the unit under the phase adjustment condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate one or more embodiments of the present specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only one or more embodiments of the present specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the position of the volute pressure relief valve in some embodiments;

[0027] Figure 2A is a time domain waveform diagram of active power in some embodiments;

[0028] Figure 2B , 2C A time domain waveform diagram of water conductance swing in some embodiments;

[0029] Figure 3 A schematic diagram of a method flow of one or more embodiments of this specification;

[0030] Figure 4 A schematic diagram of the position of a volute drain valve according to one or more embodiments of the present specification;

[0031] Figure 5 A schematic diagram of the air supply time of the air supply valve of one or more embodiments of the present specification;

[0032] Fig. 6AThis is a time domain waveform diagram of active power after eliminating fluctuations in an embodiment of this specification;

[0033] Figure 6B , 6C This is a time domain waveform diagram of the water conduction swing after eliminating the fluctuation in the embodiment of this specification;

[0034] Figure 7 A block diagram of the device structure of one or more embodiments of this specification. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0036] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should be understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] like Figure 1 As shown, in the related art, a volute pressure relief valve 32 and its isolation valves 31 and 33 are provided on the volute 10 of the pumped storage unit. When the volute pressure relief valve 32 fails and needs to be repaired or replaced, the two isolation valves 31 and 33 are closed. The isolation valve 31 is installed on the volute straight pipe section, the volute pressure relief valve 32 is installed above the isolation valve 31, and the isolation valve 33 is installed in the tailwater gallery and connected to the tailwater pipe through a pipe pre-buried in concrete. In other operating conditions, the volute pressure relief valve 32 should be in a closed state. This is because: in other operating conditions, the movable guide vane is in an open state, and water flows in the entire flow channel. If the volute pressure relief valve 32 is opened, during power generation conditions, part of the water flow in the pressure steel pipe will pass through the volute pressure relief valve 32 and flow directly to the tailwater pipe. This part of the water flow does not participate in driving the impeller to rotate and is lost; during pumping conditions, the water pressure in the pressure steel pipe is greater than the pressure of the water in the tailwater pipe, so part of the water flow will pass through the volute pressure relief valve 32 and flow directly to the tailwater pipe. This part of the water cannot be transported to the upper reservoir and is lost.

[0038] When the pumped storage unit is in phase-shifting condition, the phase-shifting water pressure system keeps the runner chamber full of gas, and the pump turbine runner rotates in the air. The cooling water from the upper and lower labyrinth rings and the water in the volute that leaks into the runner chamber through the end face gap of the guide vane will accumulate between the runner and the movable guide vane, and form a water ring under the action of the centrifugal force of the runner rotation; in addition, part of the compressed air and water ring water will enter the volute 10 through the end face gap of the movable guide vane. With the increase of running time, the pressure in the volute 10 continues to increase, the thickness of the water ring increases, resulting in increased active power loss, increased amplitude of water guide swing, and even the risk of runner damage. Therefore, when the pumped storage unit is in phase-shifting condition, it is necessary to open the volute pressure relief valve 32 and its isolation valves 31 and 33. When the water pressure in the volute increases, the pressure is released to the tailwater pipe 20 through the volute pressure relief valve to ensure that the thickness of the water ring is within a safe range and to ensure the safe and stable operation of the unit.

[0039] However, due to inadequate design considerations, under the influence of various factors such as high temperatures of the upper and lower labyrinth rings and large cooling water flow, large clearance between the guide vane ends, and high installation elevation of the volute pressure relief valve, even if the volute pressure relief valve 32 and its isolation valves 31 and 33 are opened, the water ring thickness is still too large, resulting in large fluctuations in active power and water guide swing amplitude (such as Figure 2A , 2B As shown in Figure 2C, the power value increases suddenly and periodically, and the water conductance swing amplitude in the X and Y directions increases suddenly and periodically), which causes the active power loss to increase and affects the stable operation of the unit.

[0040] In view of this, an embodiment of the present specification provides a method for eliminating fluctuations in active power and water conductance swing amplitude of a pumped storage unit. When it is determined that the active power and water conductance swing amplitude fluctuate, the target valve arranged between the volute and the tailwater pipe is first opened to a certain degree to make the fluctuation disappear, and then it is determined whether the air supply interval of the air supply valve is ideal. If it is not ideal, the opening is gradually adjusted based on the current opening of the target valve until the fluctuations in active power and water conductance swing amplitude disappear and the air supply interval is relatively ideal, thereby ensuring the safe and stable operation of the unit.

[0041] The technical solution of the present application is further described in detail below through specific embodiments.

[0042] like Figure 3 As shown, the embodiment of this specification provides a method for eliminating the fluctuation of active power and water conductance swing amplitude of a pumped storage unit. A target valve is provided on the connecting pipeline between the volute and the tailwater pipe. When the unit is in a phase adjustment condition and the volute pressure relief valve and its isolation valve are opened, when it is determined that the active power and water conductance swing amplitude fluctuate, the method includes:

[0043] S301: adjusting the opening of the target valve to the initial opening so that the fluctuations of the active power and the water conductance swing amplitude disappear;

[0044] In this embodiment, a target valve is provided on the connecting pipe between the volute and the tailwater pipe. Figure 4 As shown, the target valve is, for example, an isolation valve close to the volute side of a volute drain valve for discharging water in the volute 11, an isolation valve close to the volute side of a volute pressure-equalizing valve for balancing the pressure between the volute 11 and the tailwater pipe 21, etc.; wherein, the volute drain valve includes an isolation valve 41 and a drain valve 42, and the volute pressure-equalizing valve includes a volute pressure-equalizing valve body and its isolation valve.

[0045] During specific implementation, if a volute pressure-equalizing valve is provided on the pipeline, the isolating valve on the volute side of the volute pressure-equalizing valve shall be used alone to adjust the water pressure in the volute; if no volute pressure-equalizing valve is provided, the isolating valve on the volute side of the volute drain valve shall be used to adjust the water pressure in the volute.

[0046] When the unit is in phase adjustment condition and the volute pressure relief valve and its isolation valve are open, the time domain waveforms of active power and water conductance swing are collected and obtained through the unit status monitoring system. When it is judged that there are large fluctuations in the active power and water conductance swing amplitude, it indicates that the water ring thickness is too large and the water pressure in the volute is too high. It is necessary to adjust the water pressure in the volute through the target valve. First, open the target valve to the initial opening to eliminate the fluctuations in the active power and water conductance swing amplitude.

[0047] S302: When the target valve is at an initial opening, determining the air supply interval of the air supply valve;

[0048] In this embodiment, the fluctuations of active power and water conductance swing amplitude have been preliminarily eliminated when the target valve is at the initial opening. It is also necessary to determine whether the air supply interval of the air supply valve installed on the tailwater pipe is ideal. The air supply valve is used to supply air to the tailwater pipe when the water level in the tailwater pipe rises to a preset value, so as to ensure that the runner rotates in the air, thereby reducing active power loss and improving the operating stability of the unit. If the air supply interval is short, more frequent air supply is required, thereby consuming a large amount of compressed air, increasing the load of the plant air compressor and the number of times the air supply valve is opened and closed, which is not conducive to ensuring the safe and stable operation of the unit. Therefore, the air supply interval of the air supply valve needs to be within the ideal range.

[0049] The air supply interval refers to the time interval from the last closing of the air supply valve to the current opening. Figure 5 As shown in the figure, after adjusting the target valve to the initial opening, the state of the air supply valve is obtained through the unit monitoring system, including the opening time point of the air supply valve, the closing time point of the air supply valve, the air supply time from opening to closing of the air supply valve, etc. According to the last closing time point and the current opening time point of the air supply valve, the time interval from the last closing time point to the current starting time point is calculated, and this time interval is the air supply interval. Figure 5As shown, a high level indicates that the air supply valve is in an open state, a low level indicates that the air supply valve is in a closed state, a rising edge of the voltage signal indicates that the air supply valve is open, and a falling edge of the voltage signal indicates that the air supply valve is closed.

[0050] S303: When the air replenishment interval is less than the preset interval threshold, the initial opening is reduced to the target opening, so that the active power and water conductance swing amplitude fluctuations of the target valve disappear at the target opening, and the air replenishment interval reaches the interval threshold.

[0051] In this embodiment, after determining the air replenishment interval of the target valve at the initial opening, it is determined whether the air replenishment interval is less than the interval threshold, that is, whether the air replenishment interval is reasonable. If the air replenishment interval is less than the interval threshold, the air replenishment interval of the air replenishment valve is too short, and more frequent air replenishment is required to keep the water level in the tailwater pipe lower than the preset value. At this time, the initial opening of the target valve used to adjust the water pressure in the volute is too large and needs to be reduced. Therefore, when the air replenishment interval is less than the interval threshold, the initial opening of the target valve is reduced to the target opening. At the target opening, the target valve can eliminate the fluctuations in the active power and water conductance swing amplitude, and obtain a reasonable air replenishment interval.

[0052] In some methods, the interval threshold is greater than 15 minutes. On the basis of eliminating the fluctuation of active power and water conductance swing amplitude, the air replenishment interval should be as large as possible. The selection of the interval threshold can be adjusted according to the sealing effect of the unit runner room, and the specific value is not limited.

[0053] In some embodiments, adjusting the opening of the target valve to the initial opening to eliminate fluctuations in active power and conductance swing amplitude includes:

[0054] The opening of the target valve is adjusted to a first opening, and it is determined whether fluctuations in active power and water conductance swing amplitude exist;

[0055] If there are fluctuations in the active power and the water conductance swing amplitude, the opening is increased according to the preset adjustment amount starting from the first opening until the fluctuations in the active power and the water conductance swing amplitude disappear, and the opening corresponding to the disappearance of the fluctuations in the active power and the water conductance swing amplitude is used as the initial opening.

[0056] In this embodiment, when the active power and water conductance swing amplitude fluctuate under the phase modulation condition, the target valve is first opened to a certain opening to eliminate the fluctuation. Specifically, the target valve is first opened to a first opening, and after opening, it is determined whether the fluctuation still exists; if it still exists, the opening is increased according to a certain adjustment amount based on the first opening, until the adjusted opening can eliminate the active power and water conductance swing amplitude fluctuation, and the adjusted opening is the initial opening. Optionally, when it is determined that the active power and water conductance swing amplitude fluctuate, the opening of the target valve can be set to 2% first, and after the target valve is opened according to this opening, it is determined whether the fluctuation still exists. If it still exists, the opening is increased according to the adjustment amount of 2%, that is, the opening of 2% is adjusted to 4%, and it is determined whether the fluctuation has been eliminated. If it has been eliminated, the initial opening is 4%. If it has not been eliminated, the opening is continued to be increased to 6%... until the adjusted opening can eliminate the fluctuation, and finally the opening corresponding to the elimination of the fluctuation is determined as the initial opening.

[0057] In some embodiments, the execution subject of the method of this specification can be a unit monitoring system, the target valve is an electric valve that can be controlled to open and close and whose opening is adjustable, and the volute drain valve or volute pressure relief valve is an electric valve or pneumatic valve that can be controlled to open or close, and the specific form is not limited. The unit monitoring system is used to monitor the unit operating status (including active power and water conductance swing waveform, air supply status, etc.). When there are fluctuations in the active power and water conductance swing amplitude, the opening of the target valve is controlled and adjusted according to the method of this specification to eliminate the fluctuations and ensure safe and stable operation of the unit.

[0058] In a specific embodiment, the method of this specification specifically includes:

[0059] The unit enters the pumping phase adjustment or power generation phase adjustment condition, and the volute pressure relief valve opens;

[0060] Use the unit status monitoring system to obtain the active power waveform and water conductance swing waveform, and obtain the opening and closing status of the air supply valve;

[0061] When it is determined that the active power and the amplitude of the water conductance swing fluctuate, it is determined that the pressure in the volute increases, the thickness of the water ring is too large, and the runner and the water ring collide and rub;

[0062] Control the target valve to open to a first opening, such as 2%; determine whether the fluctuation still exists, and if so, continue to increase the opening of the target valve until the fluctuation disappears, and determine the initial opening at this time;

[0063] When the target valve is at the initial opening, the fluctuation disappears, and the air supply interval of the air supply valve is determined according to the closing time point and the opening time point of the air supply valve;

[0064] If the air replenishment interval is less than the interval threshold (for example, 15 minutes), it is judged that the air replenishment interval is short and the target valve opening is too large. Based on the initial opening, the opening is reduced. In the process of adjusting the opening, the changes in active power, water conductance swing amplitude and air replenishment interval are considered at the same time, and the opening is continuously fine-tuned to reduce or increase. Finally, the target opening is determined, so that under the target opening, large fluctuations in active power and water conductance swing amplitude can be eliminated, and the air replenishment interval is relatively reasonable to ensure safe and stable operation of the unit.

[0065] When the unit enters other operating conditions except phase adjustment condition, close the volute drain valve or volute pressure relief valve.

[0066] Combination Fig. 6A , 6B As shown in 6C, when the target valve is the isolation valve of the volute pressure-smoothing valve close to the volute side, the fluctuations of active power and water conductance swing amplitude can be eliminated through the above control and regulation process.

[0067] It should be noted that the method of one or more embodiments of this specification can be performed by a single device, such as a computer or server. The method of this embodiment can also be applied in a distributed scenario and completed by multiple devices cooperating with each other. In the case of such a distributed scenario, one of the multiple devices can only perform one or more steps in the method of one or more embodiments of this specification, and the multiple devices will interact with each other to complete the described method.

[0068] It should be noted that the above is a description of a specific embodiment of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0069] like Figure 7 As shown, the embodiment of this specification also provides a device for eliminating the fluctuation of active power and water conductance swing amplitude of a pumped storage unit, comprising:

[0070] The initial opening adjustment module is used to adjust the opening of the target valve to the initial opening when the unit is in the phase adjustment condition and the volute pressure relief valve is open, and when it is judged that there are large fluctuations in the active power and the water conductance swing amplitude, so that the fluctuations in the active power and the water conductance swing amplitude disappear;

[0071] The air supply interval determination module is used to determine the air supply interval of the air supply valve when the target valve is at an initial opening;

[0072] The target opening adjustment module is used to reduce the initial opening to the target opening when the air filling interval is less than the preset interval threshold, so that the active power and water conductance swing amplitude fluctuations of the target valve disappear under the target opening, and the air filling interval reaches the interval threshold.

[0073] For the convenience of description, the above devices are described in terms of functions divided into various modules. Of course, when implementing one or more embodiments of this specification, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0074] The apparatus of the above-mentioned embodiment is used to implement the corresponding method in the above-mentioned embodiment, and has the beneficial effects of the corresponding method embodiment, which will not be described in detail here.

[0075] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. In line with the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present specification as described above, which are not provided in detail for the sake of simplicity.

[0076] In addition, to simplify the description and discussion, and in order not to obscure one or more embodiments of the present specification, known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided figures. In addition, the device may be shown in the form of a block diagram so as to avoid obscuring one or more embodiments of the present specification, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which one or more embodiments of the present specification will be implemented (i.e., these details should be fully within the scope of understanding of those skilled in the art). Where specific details (e.g., circuits) are set forth to describe exemplary embodiments of the present disclosure, it is apparent to those skilled in the art that one or more embodiments of the present specification may be implemented without these specific details or with variations in these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0077] Although the present disclosure has been described in conjunction with specific embodiments of the present disclosure, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0078] One or more embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this disclosure.

Claims

1. A method for eliminating fluctuations in active power and water conductance swing amplitude of a pumped storage unit, wherein a target valve is provided on the connecting pipeline between the volute and the tailwater pipe, and when the unit is in a phase adjustment condition and the volute pressure relief valve and its isolation valve are open, when it is determined that the active power and water conductance swing amplitude fluctuate, the method is characterized in that: Methods include: The opening of the target valve is adjusted to the initial opening so that the fluctuations of the active power and the water conductance swing amplitude disappear, comprising: adjusting the opening of the target valve to a first opening, and determining whether the fluctuations of the active power and the water conductance swing amplitude exist; if the fluctuations of the active power and the water conductance swing amplitude exist, increasing the opening according to a preset adjustment amount from the first opening until the fluctuations of the active power and the water conductance swing amplitude disappear, and taking the opening corresponding to the disappearance of the fluctuations of the active power and the water conductance swing amplitude as the initial opening; The target valve determines the air supply interval of the air supply valve under the initial opening degree; When the air replenishment interval is smaller than a preset interval threshold, the initial opening is reduced to a target opening. In the process of adjusting the opening, the changes in active power, water conductance swing amplitude and air replenishment interval are simultaneously considered, and the opening is continuously fine-tuned to reduce or increase the opening, and finally the target opening is determined, so that when the target valve is at the target opening, the fluctuations in active power and water conductance swing amplitude disappear, and the air replenishment interval reaches the interval threshold.

2. The method according to claim 1, characterized in that The target valve is at an initial opening, and the air supply interval of the air supply valve is determined, including: When the target valve is at an initial opening, obtaining the opening time point and closing time point of the air supply valve; The time interval between the last closing time point and the current opening time point of the air supply valve is used as the air supply interval.

3. The method according to claim 1, characterized in that Also includes: When the unit is in other operating conditions except the phase adjustment condition, the target valve maintains the target opening.

4. The method according to claim 1, characterized in that: The target valve is an isolation valve of a volute drainage valve or a volute pressure relief valve close to the volute side.

5. The method according to claim 4, characterized in that If the volute drain valve and the volute pressure relief valve are provided on the communicating pipeline, the target valve is an isolation valve of the volute pressure relief valve close to the volute side.

6. The method according to claim 1, characterized in that The first opening degree is 2%, and the adjustment amount is 2%.

7. The method according to claim 1, characterized in that The interval threshold is greater than 15 minutes.

8. A device for eliminating fluctuations in active power and water conductance swing amplitude of a pumped storage unit, wherein a target valve is provided on the connecting pipeline between the volute and the tailwater pipe, and is characterized in that: include: An initial opening adjustment module is used for adjusting the opening of the target valve to the initial opening when it is determined that the active power and the water conductance swing amplitude fluctuate when the unit is in a phase adjustment condition and the volute pressure relief valve is open, so that the fluctuations of the active power and the water conductance swing amplitude disappear, including adjusting the opening of the target valve to a first opening, and determining whether the fluctuations of the active power and the water conductance swing amplitude exist; if the fluctuations of the active power and the water conductance swing amplitude exist, increasing the opening according to a preset adjustment amount from the first opening until the fluctuations of the active power and the water conductance swing amplitude disappear, and taking the opening corresponding to the disappearance of the fluctuations of the active power and the water conductance swing amplitude as the initial opening; An air supply interval determination module, used to determine the air supply interval of the air supply valve when the target valve is at an initial opening; The target opening adjustment module is used to adjust the initial opening to the target opening when the air replenishment interval is less than a preset interval threshold. In the process of adjusting the opening, the changes in the active power, the water conductance swing amplitude and the air replenishment interval are considered at the same time, and the opening is continuously fine-tuned to reduce or increase the opening, and finally the target opening is determined, so that when the target valve is at the target opening, the fluctuations in the active power and the water conductance swing amplitude disappear, and the air replenishment interval reaches the interval threshold.

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