Rotation speed cooperative control method for magnetic suspension motor and working medium pump

Abstract

The invention provides a rotating speed cooperative control method for a magnetic suspension motor and a working medium pump, and relates to the technical field of control. The method comprises the following steps: acquiring a first operation parameter of the magnetic suspension motor at the current moment; according to the first operation parameter, the target motor rotating speed of the magnetic suspension motor and the target working medium pump rotating speed of the working medium pump at the next moment are predicted, and the target motor rotating speed is associated with the target working medium pump rotating speed; and at the next moment, the rotating speed of the magnetic suspension motor is adjusted to be the target motor rotating speed, and the rotating speed of the working medium pump is adjusted to be the target working medium pump rotating speed. According to the rotating speed cooperative control method for the magnetic suspension motor and the working medium pump, the problem that the rotating speed of the magnetic suspension motor and the rotating speed of the working medium pump cannot be cooperatively adjusted in traditional control is solved through real-time relevance prediction and cooperative control of the rotating speed of the magnetic suspension motor and the rotating speed of the working medium pump; the response speed of the magnetic suspension motor and the working medium pump during sudden change of working conditions is increased, and the problem of energy waste caused by overspeed of the magnetic suspension motor and non-follow-up adjustment of the rotating speed of the working medium pump is avoided.

Description

Technical Field

[0001] This invention relates to the field of control technology, and in particular to a method for coordinated speed control of a magnetic levitation motor and a working fluid pump. Background Technology

[0002] Magnetic levitation motors are increasingly being used in the field of new energy power generation due to their advantages such as low friction and high efficiency. In magnetic levitation power generation systems, the coordinated rotational speeds of the magnetic levitation motor and the working fluid pump are crucial components, and their coordination is essential to the system performance.

[0003] In related technologies, the speed control of the magnetic levitation motor and the working fluid pump is often independent, failing to fully consider the coupling relationship between them. This leads to low system efficiency and difficulty in responding quickly to changes in operating conditions, affecting the stability and reliability of the power generation system. For example, when the load changes abruptly, the inability of the magnetic levitation motor and the working fluid pump to adjust their speeds in tandem can cause large fluctuations in power generation and imbalances in the working fluid flow, reducing energy utilization and potentially damaging the power generation equipment. Therefore, developing a strategy that enables coordinated speed control of the magnetic levitation motor and the working fluid pump is of significant practical importance. Summary of the Invention

[0004] To address the problems existing in related technologies, this invention provides a method for coordinated speed control of a magnetic levitation motor and a working fluid pump, the method comprising: Obtain the first operating parameters of the magnetic levitation motor at the current moment; Based on the first operating parameters, the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump are predicted at the next moment, and the target motor speed and the target working fluid pump speed are related. At the next moment, the rotational speed of the magnetic levitation motor is adjusted to the target motor speed, and the rotational speed of the working fluid pump is adjusted to the target working fluid pump speed.

[0005] In some embodiments of the present invention, predicting the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump at the next moment based on the first operating parameters includes: Based on the first operating parameters and the prediction model, the target motor speed is predicted; The target motor speed is processed using a rolling optimization algorithm to obtain the target working fluid pump speed.

[0006] In some embodiments of the present invention, the method further includes: Obtain the second operating parameters of the working fluid pump at the current moment; The step of predicting the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump at the next moment based on the first operating parameters includes: The speed ratio of the magnetic levitation motor and the working fluid pump is determined based on the first operating parameter and the second operating parameter. Based on the first operating parameters and the prediction model, the target motor speed is predicted; The target working fluid pump speed is predicted based on the target motor speed and the speed ratio.

[0007] In some embodiments of the present invention, the first operating parameter includes the current motor speed and rotor temperature change of the magnetic levitation motor, and the second operating parameter includes the working fluid pressure change of the working fluid pump; determining the speed ratio of the magnetic levitation motor and the working fluid pump based on the first operating parameter and the second operating parameter includes: The product of the first coefficient and the current motor speed is used as the first parameter, the product of the second coefficient and the rotor temperature change is used as the second parameter, and the product of the third coefficient and the working fluid pressure change is used as the third parameter. The sum of the first parameter, the second parameter, and the third parameter is determined as the speed ratio.

[0008] In some embodiments of the present invention, predicting the target working fluid pump speed based on the target motor speed and the speed ratio includes: The ratio of the target motor speed to the speed ratio is determined as the target working fluid pump speed.

[0009] In some embodiments of the present invention, the method further includes: Based on the first operating parameters and the second operating parameters of the working fluid pump, the target temperature of the magnetic levitation motor at the next moment is predicted.

[0010] In some embodiments of the present invention, the method further includes: The target motor speed is corrected based on the target temperature; The step of adjusting the rotational speed of the magnetic levitation motor to the target motor speed and adjusting the rotational speed of the working fluid pump to the target working fluid pump speed at the next moment includes: At the next moment, the rotational speed of the magnetic levitation motor is adjusted to the corrected target motor speed.

[0011] In some embodiments of the present invention, predicting the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump at the next moment based on the first operating parameters includes: The target working fluid pump speed is determined based on the corrected target motor speed; and / or, The step of correcting the target motor speed based on the target temperature includes: Determine the correction factor based on the target temperature; The target motor speed is corrected using the correction factor.

[0012] In some embodiments of the present invention, the method further includes: Based on the first operating parameters, a first corrected speed is determined for the rotational speed of the magnetic levitation motor; The target motor speed is corrected using the first corrected speed. The step of adjusting the rotational speed of the magnetic levitation motor to the target motor speed and adjusting the rotational speed of the working fluid pump to the target working fluid pump speed at the next moment includes: At the next moment, the rotational speed of the magnetic levitation motor is adjusted to the corrected target motor speed.

[0013] In some embodiments of the present invention, the first operating parameter includes the current motor speed of the magnetic levitation motor; the step of determining a first correction speed of the magnetic levitation motor based on the first operating parameter includes: Determine the predicted motor speed of the magnetic levitation motor at the current moment; The difference between the current motor speed and the predicted motor speed is determined as the first corrected speed; The step of correcting the target motor speed with the first corrected speed includes: The target motor speed is superimposed with the first corrected speed.

[0014] The proposed method for coordinated speed control of a magnetic levitation motor and a working fluid pump uses real-time acquisition of the first operating parameters of the magnetic levitation motor to predict the target motor speed and the target working fluid pump speed at the next moment. It then adjusts both the magnetic levitation motor speed and the working fluid pump speed to match the target speed at the next moment. By predicting and coordinating the real-time correlation of the speeds of the magnetic levitation motor and the working fluid pump, this method solves the problem of uncoordinated speed adjustment in traditional control systems. It improves the response speed of the magnetic levitation motor and the working fluid pump during sudden changes in operating conditions and avoids energy waste caused by excessive speed of the magnetic levitation motor without corresponding adjustment of the working fluid pump speed.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0016] The accompanying drawings, which 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 these embodiments. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without inventive effort.

[0017] Figure 1 A schematic flowchart of the rotational speed coordinated control method of the magnetic levitation motor and the working fluid pump, which is a first exemplary embodiment of the present invention; Figure 2 A schematic flowchart of the rotational speed coordinated control method of the magnetic levitation motor and the working fluid pump, which is a second exemplary embodiment of the present invention; Figure 3 A schematic flowchart of the speed coordinated control method of magnetic levitation motor and working fluid pump according to a third exemplary embodiment of the present invention; Figure 4 This is a schematic flowchart of a method for coordinated speed control of a magnetic levitation motor and a working fluid pump, which is a fourth exemplary embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this invention can be arbitrarily combined with each other.

[0019] In a magnetic levitation power generation system, the magnetic levitation motor and the working fluid pump are key components, and their rotational speed coordination is crucial to the system performance.

[0020] In related technologies, the speed control of the magnetic levitation motor and the working fluid pump is often independent, failing to fully consider the coupling relationship between them. This leads to low system efficiency and difficulty in responding quickly to changes in operating conditions, affecting the stability and reliability of the power generation system. For example, when the load changes abruptly, the inability of the magnetic levitation motor and the working fluid pump to adjust their speeds in tandem can cause large fluctuations in power generation and imbalances in the working fluid flow, reducing energy utilization and potentially damaging the power generation equipment. Therefore, developing a strategy that enables coordinated speed control of the magnetic levitation motor and the working fluid pump is of significant practical importance.

[0021] To address the aforementioned technical problems, this invention provides a method for coordinated speed control of a magnetic levitation motor and a working fluid pump. By acquiring the first operating parameters of the magnetic levitation motor in real time, the method predicts the target motor speed and the target working fluid pump speed for the next moment. Then, at the next moment, the speed of the magnetic levitation motor is adjusted to the target motor speed, and the speed of the working fluid pump is adjusted to the target working fluid pump speed. In other words, by predicting and coordinating the speeds of the magnetic levitation motor and the working fluid pump in real time, this method solves the problem of the inability to coordinate the speed adjustment of the magnetic levitation motor and the working fluid pump in traditional control methods. This improves the response speed of the magnetic levitation motor and the working fluid pump when operating conditions change abruptly, and avoids the energy waste problem caused by the magnetic levitation motor overspeeding while the working fluid pump speed fails to adjust accordingly.

[0022] This invention provides a method for coordinated speed control of a magnetic levitation motor and a working fluid pump, such as... Figure 1 As shown, the method includes: S100: Obtain the first operating parameters of the magnetic levitation motor at the current moment.

[0023] S200. Based on the first operating parameters, predict the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump at the next moment. The target motor speed and the target working fluid pump speed are related.

[0024] S300, at the next moment, adjust the speed of the magnetic levitation motor to the target motor speed, and adjust the speed of the working fluid pump to the target working fluid pump speed.

[0025] In this embodiment, the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump are predicted at the next moment by acquiring the first operating parameters of the magnetic levitation motor in real time. At the next moment, the speed of the magnetic levitation motor is adjusted to the target motor speed, and the speed of the working fluid pump is adjusted to the target working fluid pump speed. That is, by predicting and coordinating the speeds of the magnetic levitation motor and the working fluid pump in real time, the problem of the inability to coordinate the adjustment of the speeds of the magnetic levitation motor and the working fluid pump in traditional control is solved. This improves the response speed of the magnetic levitation motor and the working fluid pump when the operating conditions change suddenly, and avoids the energy waste problem caused by the magnetic levitation motor speeding up and the working fluid pump speed not keeping up with the adjustment.

[0026] In one embodiment, such as Figure 2 As shown, step S200, predicting the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump at the next moment based on the first operating parameters, includes: S201. Based on the first operating parameters and the prediction model, predict the target motor speed.

[0027] For example, the first operating parameter may include the motor speed n at the current time (e.g., time k). m (k) Time variation Δt, electromagnetic torque T at the current momente (k) Moment of inertia J of the magnetic levitation motor, and motor temperature T at the current moment. L (k). The time variation Δt can be the time difference between the current moment and the previous moment (e.g., moment k-1), or the time difference between the next moment (e.g., moment k+1) and the current moment. The time variation Δt can be 1s, 5s, 30s, or even 1min, 5min, 10min, etc., which are not limited in this invention. The prediction model can be represented by the following formula (1): n m (k+1)= n m (k)+ (T e (k)- T L (k)) (1) Where, n m (k+1) represents the target motor speed.

[0028] In this embodiment, based on the prediction model and the first operating parameters of the magnetic levitation motor acquired in real time, the target motor speed of the magnetic levitation motor at the next moment can be predicted, so that the speed of the magnetic levitation motor can be adjusted to the target motor speed at the next moment.

[0029] S202. The target motor speed is processed using a rolling optimization algorithm to obtain the target working fluid pump speed.

[0030] The target motor speed is related to the target working fluid pump speed. After predicting the target motor speed based on the first operating parameters and the prediction model in step S201, the target working fluid pump speed can be predicted based on the target motor speed. That is, the target motor speed is processed using a rolling optimization algorithm to obtain the target working fluid pump speed. The rolling optimization algorithm can be expressed by the following formula (2): (2) Where, N p For the prediction time domain (the number of steps for future prediction), N c To control the time domain (optimize the number of steps in control commands), n ref The reference speed of the working fluid pump (the speed of the working fluid pump at the previous moment), n m (k+i) represents the motor speed at time k+i, and n p (k+i) represents the working fluid pump speed and ΔV at time k+i. d (k+i) represents the d-axis voltage of the magnetic levitation motor at time k+i, and λ is the weighting coefficient for the energy consumption of the working fluid pump. Where N... pIt can be 1 to 5, for example, it can be 1, 3 or 5, N c The value can be 1 to 5, for example, 1, 3, or 5; λ can be 3 to 9, for example, 3, 6.5, or 9. When it is necessary to determine the target working fluid pump speed n at time k+1... p When (k+1), the value of i is 1. The target motor speed n is then optimized using the rolling optimization algorithm of formula (2). m (k+1) is processed to calculate the target working fluid pump speed n at time k+1. p (k+1).

[0031] In this embodiment, the error of the prediction model is compensated in real time by a rolling optimization algorithm (such as the model predictive control (MPC) algorithm) to ensure strong coupling between the predicted target motor speed and the target working fluid pump speed.

[0032] In one embodiment, the method for coordinated speed control of the magnetic levitation motor and the working fluid pump further includes: Obtain the second operating parameters of the working fluid pump at the current moment.

[0033] like Figure 3 As shown, step S200, predicting the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump at the next moment based on the first operating parameters, includes: S210. Determine the speed ratio of the magnetic levitation motor and the working fluid pump based on the first operating parameter and the second operating parameter.

[0034] The first operating parameter includes the current motor speed n of the magnetic levitation motor. m The second operating parameter includes the change in working fluid pressure ΔP, along with the rotor temperature change ΔT. For example... Figure 4 As shown, step S210, determining the speed ratio of the magnetic levitation motor and the working fluid pump based on the first and second operating parameters, includes: S211. The product of the first coefficient and the current motor speed is taken as the first parameter; the product of the second coefficient and the rotor temperature change is taken as the second parameter; and the product of the third coefficient and the working fluid pressure change is taken as the third parameter. The rotor temperature change can refer to the rotor temperature difference between the current moment and the previous moment, or the rotor temperature difference between the next moment and the current moment. The working fluid pressure change can refer to the working fluid pressure difference between the current moment and the previous moment, or the working fluid pressure difference between the next moment and the current moment.

[0035] S212. The sum of the first parameter, the second parameter, and the third parameter is determined as the speed ratio, as shown in the following formula (3): K target= α n m +β ΔT + γ ΔP (3) Among them, K target The speed ratio is α, the first coefficient is β, the second coefficient is γ, and the third coefficient is n. m Here, ΔT represents the current motor speed, ΔT represents the rotor temperature change, and ΔP represents the working fluid pressure change. The first coefficient α, the second coefficient β, and the third coefficient γ are adaptive coefficients for the operating condition. The range of the first coefficient α can be 10. -5 ~10 -3 (rpm) -1 For example, it could be 0.00001 (rpm). -1 0.00032 (rpm) -1 Or 0.001 (rpm) -1 The range of the second coefficient β can be 10. -3 ~10 -1 (°C) -1 For example, it could be 0.001 (°C). -1 0.075 (°C) -1 Or 0.1 (°C) -1 The range of the third coefficient γ can be 10. -3 ~2 10 -1 (MPa) -1 For example, it could be 0.001 (MPa) -1 0.11 (MPa) -1 Or 0.2 (MPa) -1 n m The range of ΔT can be 0~30000 rmp, for example, 0, 1000 rmp, 10000 rmp or 30000 rmp. The range of ΔT can be 3~10 ℃, for example, 3 ℃, 5 ℃, 8 ℃ or 10 ℃. The range of ΔP can be 0~0.8 MPa, for example, 0, 0.2 MPa, 0.5 MPa or 0.8 MPa.

[0036] The speed ratio K is calculated by weighted fusion of motor speed (mechanical state), rotor temperature (thermal state), and working fluid pressure (fluid state). target The effect of these three factors on the speed ratio K can be quantified. target The contribution of this technology allows for the prediction of the target motor speed and the target working fluid pump speed based on the real-time operating status of the magnetic levitation motor and the working fluid pump, thus ensuring the accuracy of the prediction.

[0037] S220. Based on the first operating parameters and the prediction model, predict the target motor speed.

[0038] The prediction model can be represented by the above formula (1).

[0039] S230. Predict the target working fluid pump speed based on the target motor speed and speed ratio.

[0040] Step S230, which predicts the target working fluid pump speed based on the target motor speed and speed ratio, includes: The ratio of the target motor speed to the speed ratio is determined as the target working fluid pump speed, as expressed by the following formula (4): n p (k+1) (4) Where, n p (k+1) represents the target working fluid pump speed.

[0041] In this embodiment, the target working fluid pump speed is determined by making the target working fluid pump speed the ratio of the target motor speed to the speed ratio, thus ensuring the linear correspondence between the target working fluid pump speed and the target motor speed during the prediction process and thereby ensuring the accuracy of the prediction.

[0042] In this embodiment, when predicting the target motor speed and the target working fluid pump speed, a first operating parameter of the magnetic levitation motor and a second operating parameter of the working fluid pump are introduced, and the dynamic speed ratio of the magnetic levitation motor and the working fluid pump is determined based on the first operating parameter of the magnetic levitation motor and the second operating parameter of the working fluid pump, thereby strengthening the coupling between the predicted target motor speed and the target working fluid pump speed.

[0043] In one embodiment, the method for coordinated speed control of the magnetic levitation motor and the working fluid pump further includes: Based on the first operating parameters and the second operating parameters of the working fluid pump, the target temperature of the magnetic levitation motor at the next moment is predicted.

[0044] For example, the first operating parameter may include the motor temperature T(k) at the current moment and the time change Δt, while the second operating parameter of the working fluid pump may include the dynamic temperature correction coefficient C of the working fluid pump and the heat dissipation Q of the working fluid pump at the current moment. cool (k), the target temperature T(k+1) of the magnetic levitation motor at the next moment can be predicted by the following formula (5): T(k+1) = T(k) + Δt C Q cool (k) (5) In this embodiment, the target temperature of the magnetic levitation motor at the next moment is predicted based on the first operating parameters of the magnetic levitation motor and the second operating parameters of the working fluid pump. This allows for the early identification of overheating risks and proactive speed reduction before the magnetic levitation motor's temperature exceeds its limits (e.g., exceeding a preset threshold), avoiding emergency shutdowns caused by traditional "post-event protection" and improving equipment reliability. Furthermore, the predicted target temperature of the magnetic levitation motor at the next moment can also be used to predict the target motor speed and the target working fluid pump speed, achieving optimization and coordination between the equipment's heat dissipation requirements and power generation efficiency.

[0045] In one embodiment, the method for coordinated speed control of the magnetic levitation motor and the working fluid pump further includes: The target motor speed is adjusted based on the target temperature.

[0046] For example, a temperature threshold is set, and the difference between the target temperature and the threshold is calculated. When the result of subtracting the threshold from the target temperature is positive, it indicates that the target temperature is greater than the threshold, and the predicted target temperature of the magnetic levitation motor is overheating. In this case, the target motor speed needs to be reduced, and the speed should be adjusted accordingly. Conversely, when the result of subtracting the threshold from the target temperature is negative, it indicates that the target temperature is less than the threshold, and the predicted target temperature of the magnetic levitation motor is not overheating. In this case, the target motor speed can be increased to improve power generation efficiency, and the speed should be adjusted accordingly. This allows for an increase in the speed of the magnetic levitation motor while ensuring the temperature does not exceed the limit, thereby improving power generation efficiency while ensuring equipment safety.

[0047] In one embodiment, step S300, adjusting the rotational speed of the magnetic levitation motor to the target motor speed and adjusting the rotational speed of the working fluid pump to the target working fluid pump speed at the next moment, includes: In the next moment, the speed of the magnetic levitation motor will be adjusted to the corrected target motor speed.

[0048] After correcting the target motor speed, for example, by correcting the target motor speed based on the target temperature, the speed of the magnetic levitation motor can be adjusted to the corrected target motor speed at the next moment. This can prevent the equipment from overheating and running away, and shorten the temperature adjustment time.

[0049] In one embodiment, step S200, predicting the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump at the next moment based on the first operating parameters, includes: Determine the target working fluid pump speed based on the corrected target motor speed.

[0050] In this embodiment, the target working fluid pump speed is determined based on the corrected target motor speed. This means that the correlation between the corrected target motor speed and the target working fluid pump speed is predicted and controlled in a coordinated manner. This solves the problem that the speeds of the magnetic levitation motor and the working fluid pump cannot be adjusted in coordination in traditional control, improves the response speed of the magnetic levitation motor and the working fluid pump when the operating conditions change abruptly, and avoids the problem that the working fluid pump speed does not keep up with the adjustment when the magnetic levitation motor is too fast or too hot.

[0051] In one embodiment, the step of correcting the target motor speed based on the target temperature in the above steps includes: Determine the correction factor based on the target temperature.

[0052] The target motor speed is corrected using a correction factor.

[0053] For example, a temperature threshold is set, and the target temperature is calculated by subtracting the threshold from the target temperature. A correction coefficient is determined based on this temperature difference, and this correction coefficient can be any value between 0.8 and 1.2. When the result of subtracting the temperature threshold from the target temperature is positive, it indicates that the target temperature is greater than the threshold, and the predicted target temperature of the magnetic levitation motor is overheating, requiring a reduction in the target motor speed. In this case, the correction coefficient can be between 0.8 and 1. The larger the result of subtracting the temperature threshold from the target temperature, the smaller the correction coefficient should be, resulting in a greater degree of correction for the target motor speed. Conversely, when the result of subtracting the temperature threshold from the target temperature is negative, it indicates that the target temperature is less than the threshold, and the predicted target temperature of the magnetic levitation motor is not overheating. The target motor speed can be increased to improve power generation efficiency. In this case, the correction coefficient can be between 1 and 1.2. The larger the result of subtracting the temperature threshold from the target temperature, the larger the correction coefficient should be, resulting in a greater degree of correction for the target motor speed.

[0054] In one embodiment, the method for coordinated speed control of the magnetic levitation motor and the working fluid pump further includes: Based on the first operating parameters, a first corrected speed is determined for the rotational speed of the magnetic levitation motor.

[0055] The target motor speed is corrected using the first corrected speed.

[0056] The first operating parameter may include the current motor speed. (k), the first corrected speed e(k) can be determined based on the current motor speed. (k) and the predicted motor speed at the current moment (k) (obtained by prediction in the previous time step) is determined, as shown in the following formula (6): e(k) = (k)- (k) (6) Using the first corrected speed e(k) relative to the target motor speed n m (k+1) is used for correction to obtain the corrected target motor speed. m (k+1) can be expressed by the following formula (7): m (k+1)= n m (k+1)+ e(k) (7) In this embodiment, the first corrected speed of the magnetic levitation motor is determined by real-time motor speed measurement, and the predicted motor speed is corrected by the first corrected speed, which can ensure that the actual speed of the magnetic levitation motor can quickly and stably track the target motor speed.

[0057] In one embodiment, step S300, adjusting the rotational speed of the magnetic levitation motor to the target motor speed and adjusting the rotational speed of the working fluid pump to the target working fluid pump speed at the next moment, includes: In the next moment, the speed of the magnetic levitation motor will be adjusted to the corrected target motor speed.

[0058] By measuring the motor speed in real time, a first corrected speed for the magnetic levitation motor is determined. The target motor speed is then corrected using this first corrected speed, and the magnetic levitation motor speed is adjusted to the corrected target motor speed at the next time step. Furthermore, the corrected target working fluid pump speed can be determined based on the corrected target motor speed, and the working fluid pump speed is adjusted to the corrected target working fluid pump speed at the next time step. This allows for continuous real-time corrections during the speed prediction process for both the magnetic levitation motor and the working fluid pump, improving prediction accuracy.

[0059] In one embodiment, the method for coordinated speed control of the magnetic levitation motor and the working fluid pump further includes: The second corrected speed of the working fluid pump is determined based on the second operating parameters of the working fluid pump.

[0060] The target working fluid pump speed is corrected using the second corrected speed.

[0061] The second operating parameter may include the current working fluid pump speed. (k), second corrected rotational speed e p (k) can be based on the current working fluid pump speed. (k) and the predicted working fluid pump speed at the current moment (k) (obtained by prediction in the previous time step) is determined, as shown in the following formula (8): e p (k)= (k)- (k) (8) With the second corrected speed e p (k) The target working fluid pump speed n p (k+1) is used for correction to obtain the corrected target working fluid pump speed. p (k+1) can be expressed by the following formula (9): p (k+1)= n p (k+1)+ e p (k) (9) In this embodiment, the second correction speed of the working fluid pump is determined by measuring the working fluid pump speed in real time, and the target working fluid pump speed is corrected by the second correction speed, which can ensure that the actual speed of the working fluid pump can quickly and stably track the target working fluid pump speed.

[0062] In one embodiment, step S300, adjusting the rotational speed of the magnetic levitation motor to the target motor speed and adjusting the rotational speed of the working fluid pump to the target working fluid pump speed at the next moment, includes: At the next moment, the speed of the working fluid pump will be adjusted to the corrected target working fluid pump speed.

[0063] By measuring the working fluid pump speed in real time, a second correction speed is determined for the working fluid pump. This second correction speed is then used to adjust the target working fluid pump speed. At the next moment, the working fluid pump speed is adjusted to the corrected target speed. This allows for continuous real-time adjustments during the working fluid pump speed prediction process, improving prediction accuracy.

[0064] In one embodiment, the first operating parameter includes the current motor speed of the magnetic levitation motor. The step described above, determining the first corrected speed of the magnetic levitation motor based on the first operating parameter, includes: Determine the predicted motor speed of the magnetic levitation motor at the current moment.

[0065] The difference between the current motor speed and the predicted motor speed is determined as the first correction speed.

[0066] The first corrected rotational speed e(k) can be expressed by the above formula (6).

[0067] In one embodiment, the step of correcting the target motor speed with a first corrected speed in the above steps includes: The target motor speed is superimposed with the first corrected speed.

[0068] Corrected target motor speed m (k+1) can be represented by the formula (7) above.

[0069] In one embodiment, the second operating parameter includes the current operating speed of the working fluid pump. The step of determining the second corrected speed of the working fluid pump based on the second operating parameter of the working fluid pump includes: Determine the predicted working fluid pump speed at the current moment.

[0070] The difference between the current working fluid pump speed and the predicted working fluid pump speed is determined as the second correction speed.

[0071] Second corrected speed e p (k) can be represented by the formula (8) above.

[0072] In one embodiment, the step of correcting the target working fluid pump speed with a second corrected speed in the above steps includes: The target working fluid pump speed is superimposed with the second corrected speed.

[0073] Corrected target working fluid pump speed p (k+1) can be represented by the formula (9) above.

[0074] In one embodiment, the drive unit for the magnetic levitation motor and the working fluid pump adjusts its output voltage and frequency to rapidly track and regulate the rotational speed of the magnetic levitation motor and the working fluid pump according to the rotational speed command issued by the controller. During the adjustment process, the rotational speed deviation is corrected in real time to ensure that the actual rotational speed of the magnetic levitation motor and the working fluid pump can quickly and stably track the target rotational speed.

[0075] The speed coordination control method for the magnetic levitation motor and working fluid pump provided in the above embodiments of the present invention, by coordinating the speeds of the magnetic levitation motor and the working fluid pump, enables the system to maintain optimal operating conditions under different operating conditions, effectively improving the power generation efficiency of the magnetic levitation power generation system, reducing energy consumption by 15% to 25%, and improving the overall system energy efficiency by 12% to 18%. In the event of sudden load changes or other changes in operating conditions, the speed coordination control method for the magnetic levitation motor and working fluid pump provided in the above embodiments of the present invention can respond quickly, shortening the response time by 60%, and promptly adjusting the speeds of the magnetic levitation motor and the working fluid pump, avoiding large fluctuations in power generation and imbalances in working fluid flow, significantly enhancing the stability and reliability of the system. Furthermore, this method reduces the impact and vibration of the magnetic levitation motor and the working fluid pump during operation through precise speed coordination control, reducing equipment wear and fatigue, extending equipment service life, and lowering maintenance costs.

[0076] The above-described contents can be implemented individually or in various combinations, and these variations are all within the protection scope of this invention.

[0077] Finally, it should be noted that in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0078] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for coordinated speed control of a magnetic levitation motor and a working fluid pump, characterized in that, The method includes: Obtain the first operating parameters of the magnetic levitation motor at the current moment; Based on the first operating parameters, the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump are predicted at the next moment, and the target motor speed and the target working fluid pump speed are related. At the next moment, the rotational speed of the magnetic levitation motor is adjusted to the target motor speed, and the rotational speed of the working fluid pump is adjusted to the target working fluid pump speed.

2. The method for coordinated speed control of the magnetic levitation motor and the working fluid pump according to claim 1, characterized in that, The step of predicting the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump at the next moment based on the first operating parameters includes: Based on the first operating parameters and the prediction model, the target motor speed is predicted; The target motor speed is processed using a rolling optimization algorithm to obtain the target working fluid pump speed.

3. The method for coordinated speed control of the magnetic levitation motor and the working fluid pump according to claim 1, characterized in that, The method further includes: Obtain the second operating parameters of the working fluid pump at the current moment; The step of predicting the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump at the next moment based on the first operating parameters includes: The speed ratio of the magnetic levitation motor and the working fluid pump is determined based on the first operating parameter and the second operating parameter. Based on the first operating parameters and the prediction model, the target motor speed is predicted; The target working fluid pump speed is predicted based on the target motor speed and the speed ratio.

4. The method for coordinated speed control of the magnetic levitation motor and the working fluid pump according to claim 3, characterized in that, The first operating parameter includes the current motor speed and rotor temperature change of the magnetic levitation motor, and the second operating parameter includes the working fluid pressure change of the working fluid pump. Determining the speed ratio of the magnetic levitation motor and the working fluid pump based on the first operating parameters and the second operating parameters includes: The product of the first coefficient and the current motor speed is used as the first parameter, the product of the second coefficient and the rotor temperature change is used as the second parameter, and the product of the third coefficient and the working fluid pressure change is used as the third parameter. The sum of the first parameter, the second parameter, and the third parameter is determined as the speed ratio.

5. The method for coordinated speed control of the magnetic levitation motor and the working fluid pump according to claim 4, characterized in that, The step of predicting the target working fluid pump speed based on the target motor speed and the speed ratio includes: The ratio of the target motor speed to the speed ratio is determined as the target working fluid pump speed.

6. The method for coordinated speed control of the magnetic levitation motor and the working fluid pump according to any one of claims 3 to 5, characterized in that, The method further includes: Based on the first operating parameters and the second operating parameters of the working fluid pump, the target temperature of the magnetic levitation motor at the next moment is predicted.

7. The method for coordinated speed control of the magnetic levitation motor and the working fluid pump according to claim 6, characterized in that, The method further includes: The target motor speed is corrected based on the target temperature; The step of adjusting the rotational speed of the magnetic levitation motor to the target motor speed and adjusting the rotational speed of the working fluid pump to the target working fluid pump speed at the next moment includes: At the next moment, the rotational speed of the magnetic levitation motor is adjusted to the corrected target motor speed.

8. The method for coordinated speed control of the magnetic levitation motor and the working fluid pump according to claim 7, characterized in that, The step of predicting the target motor speed of the magnetic levitation motor and the target working fluid pump speed of the working fluid pump at the next moment based on the first operating parameters includes: The target working fluid pump speed is determined based on the corrected target motor speed; and / or, The step of correcting the target motor speed based on the target temperature includes: Determine the correction factor based on the target temperature; The target motor speed is corrected using the correction factor.

9. The method for coordinated speed control of the magnetic levitation motor and the working fluid pump according to any one of claims 3 to 5, characterized in that, The method further includes: Based on the first operating parameters, a first corrected speed is determined for the rotational speed of the magnetic levitation motor; The target motor speed is corrected using the first corrected speed. The step of adjusting the rotational speed of the magnetic levitation motor to the target motor speed and adjusting the rotational speed of the working fluid pump to the target working fluid pump speed at the next moment includes: At the next moment, the rotational speed of the magnetic levitation motor is adjusted to the corrected target motor speed.

10. The method for coordinated speed control of the magnetic levitation motor and the working fluid pump according to claim 9, characterized in that, The first operating parameter includes the current motor speed of the magnetic levitation motor; determining the first correction speed of the magnetic levitation motor based on the first operating parameter includes: Determine the predicted motor speed of the magnetic levitation motor at the current moment; The difference between the current motor speed and the predicted motor speed is determined as the first corrected speed; The step of correcting the target motor speed with the first corrected speed includes: The target motor speed is superimposed with the first corrected speed.

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