An elevator energy-saving drive control method with the function of reactive power governance for the power grid

Abstract

The present invention relates to the field of power electronics technology, and discloses an elevator energy-saving drive control method with power grid reactive power governance function, including the following steps: Step S1: Real-time monitor the operating state of the elevator according to the elevator energy-saving box; Step S2: Establish a first drive power prediction model to predict the drive power required by the elevator; Step S3: Establish a second drive power prediction model to predict the drive power provided by the power grid; Step S4: Determine whether reactive power compensation is required through a compensation judgment model; Step S5: Receive a reactive power compensation instruction and calculate a reactive power compensation index; Step S6: Calculate the reactive power compensation capacity based on the reactive power compensation index; Step S7: Complete the reactive power compensation for the elevator energy-saving drive. By real-time monitoring the operating state of the elevator, accurately predict the drive power required by the elevator and the drive power provided by the power grid, so as to achieve precise control of the elevator energy-saving drive.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and more particularly to an elevator energy-saving drive control method with the function of reactive power governance for the power grid. Background Art

[0002] With the acceleration of urban construction and the continuous emergence of high-rise buildings, the demand for elevators has increased rapidly. However, elevators consume a large amount of electric energy during operation and become an important part of building energy consumption. In the power system, reactive power is one of the important factors for maintaining the stable operation of the power grid. However, the operation of a large number of loads requires the output of reactive power. If no artificial reactive power compensation is carried out, it is necessary to increase the capacity of the power supply line, which not only increases the line loss but also reduces the equipment utilization rate. Therefore, reactive power compensation for the power grid and improvement of the operation quality of the power grid have become an important research direction.

[0003] In order to solve the problems of elevator energy consumption and power grid reactive power, elevator energy-saving drive control technology has developed rapidly. Traditional elevator drive control methods often only focus on the operation efficiency and comfort of elevators, while ignoring the problems of energy conservation and reactive power governance. The elevator energy-saving box can feed back the regenerative electric energy generated during the process of motor speed regulation to the power grid, avoiding the energy loss caused by the resistance heating of the conventional energy-consuming braking unit. However, the traditional elevator energy-saving drive control technology cannot accurately adjust the reactive power compensation according to real-time data, resulting in a large amount of reactive power loss during the operation of the elevator and affecting the operation quality of the power grid and the energy utilization efficiency. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an elevator energy-saving drive control method with the function of reactive power governance for the power grid to solve the problems existing in the above background art.

[0005] The present invention provides the following technical solutions: An elevator energy-saving drive control method with the function of reactive power governance for the power grid, comprising the following steps:

[0006] Step S1: Real-time monitoring of the elevator operation state based on the elevator energy-saving box: Connect the elevator energy-saving box to the elevator control cabinet, and real-time monitor the elevator operation state through the elevator energy-saving box to collect elevator operation data;

[0007] Step S2: Establish a first drive power prediction model to predict the drive power required by the elevator: Establish a first drive power prediction model, input the elevator operation data into the model, and predict the drive power required by the elevator based on the elevator operation data;

[0008] Step S3: Establish a second driving power prediction model to predict the driving power provided by the power grid: The operating status of the power grid is monitored in real time through a power grid monitoring device to collect power grid operation data, and a second driving power prediction model is established to predict the driving power provided by the power grid;

[0009] Step S4: Determine whether reactive power compensation is required through a compensation judgment model: A compensation judgment model is established based on the prediction results of the first driving power prediction model and the second driving power prediction model to determine whether reactive power compensation is required for the elevator;

[0010] Step S6: Receive a reactive power compensation instruction and calculate the reactive power compensation index: Receive a reactive power compensation instruction, establish a mathematical model for calculating the reactive power compensation index, and obtain the reactive power compensation index based on the prediction results of the first driving power prediction model and the second driving power prediction model;

[0011] Step S6: Calculate the reactive power compensation capacity based on the reactive power compensation index: The reactive power compensation index is input as a variable into the reactive power compensation capacity analysis model to obtain the reactive power compensation capacity;

[0012] Step S7: Complete the reactive power compensation for the energy-saving drive of the elevator: The elevator energy-saving box receives the reactive power compensation capacity and completes the reactive power compensation for the energy-saving drive of the elevator.

[0013] Preferably, in step S1, the operating status of the elevator is monitored in real time through an elevator energy-saving box to collect elevator operation data, and the elevator operation data includes: the tension value when the elevator moves, the maximum value of the standard load-bearing mass of the elevator, the average speed when the elevator moves, and the drive efficiency of the elevator drive system.

[0014] Preferably, in step S2, a first driving power prediction model is established, and the elevator operation data is output to the model, and the driving power required by the elevator is predicted based on the elevator operation data. The calculation formula of the first driving power prediction model is: , where represents the predicted value of the driving power required by the elevator, represents the elevator movement resistance coefficient, represents the tension value when the elevator moves, represents the elevator movement friction coefficient, represents the maximum value of the standard load-bearing mass of the elevator, represents the acceleration due to gravity, represents the average speed when the elevator moves, represents the drive efficiency of the elevator drive system.

[0015] Preferably, in step S3, the operation state of the power grid is monitored in real time by a power grid monitoring device to collect power grid operation data, and a second driving power prediction model is established to predict the driving power provided by the power grid. The calculation formula of the second driving power prediction model is as follows: , where represents the predicted value of the driving power provided by the power grid, represents the standard voltage value provided by the power grid, represents the standard current value provided by the power grid, represents the power factor of the power grid.

[0016] Preferably, in step S4, based on the prediction results of the first driving power prediction model and the second driving power prediction model, a compensation judgment model is established to judge whether reactive power compensation is required for the elevator. The specific content is as follows:

[0017] Step S41: Based on the prediction results of the first driving power prediction model and the second driving power prediction model, a compensation judgment model is established. The compensation judgment model is expressed as: , where represents the difference between the predicted value of the driving power required by the elevator and the predicted value of the driving power provided by the power grid, represents the predicted value of the driving power required by the elevator, represents the predicted value of the driving power provided by the power grid;

[0018] Step S42: Judge whether reactive power compensation is required for the elevator based on the difference between the predicted value of the driving power required by the elevator and the predicted value of the driving power provided by the power grid: If the difference between the predicted value of the driving power required by the elevator and the predicted value of the driving power provided by the power grid , it is judged that no reactive power compensation is required for the elevator. If the difference between the predicted value of the driving power required by the elevator and the predicted value of the driving power provided by the power grid , it is judged that reactive power compensation is required for the elevator.

[0019] Preferably, in step S5, a reactive power compensation instruction is received, and a mathematical model for calculating the reactive power compensation index is established, and the reactive power compensation index is obtained based on the prediction results of the first driving power prediction model and the second driving power prediction model. The specific content is as follows:

[0020] Step S51: Calculate the reactive power compensation factor based on the power difference based on the prediction results of the first driving power prediction model and the second driving power prediction model. The calculation formula is: , where represents the reactive power compensation factor based on the power difference, represents the predicted value of the driving power required by the elevator, represents the predicted value of the driving power provided by the power grid;

[0021] Step S52: Input the reactive power compensation factor as a variable into the reactive power compensation index calculation model to obtain the reactive power compensation index before reactive power compensation. The calculation formula is , where represents the reactive power compensation index before reactive power compensation, represents the reactive energy output by the power grid system before reactive power compensation, represents the reactive energy absorbed by the elevator drive system before reactive power compensation.

[0022] Preferably, in step S6, input the reactive power compensation index before compensation as a variable into the reactive power compensation capacity analysis model to obtain the specific content of the reactive power compensation capacity as follows:

[0023] Step S61: Calculate the average power index during elevator operation. The calculation formula is: , where represents the average power index during elevator operation, represents the reactive load coefficient during elevator operation, represents the reactive load value during elevator operation, represents the active load coefficient during elevator operation, represents the active load value during elevator operation;

[0024] Step S62: Input the reactive power compensation index before reactive power compensation and the average power index during elevator operation as variables into the reactive power compensation capacity analysis model to obtain the reactive power compensation capacity. The calculation formula is: , where Q represents the reactive power compensation capacity, represents the tangent value of the reactive power compensation index before reactive power compensation, represents the tangent value of the average power index during elevator operation, represents the predicted value of the driving power required by the elevator, represents the predicted value of the driving power provided by the power grid.

[0025] Preferably, in step S7, the elevator energy-saving box receives the reactive power compensation capacity output by the reactive power compensation capacity analysis model, adjusts the reactive power compensation device in the elevator energy-saving box, and makes the output of the elevator energy-saving box match the calculated reactive power compensation capacity to complete the reactive power compensation for elevator energy-saving drive.

[0026] Technical effects and advantages of the present invention:

[0027] The present invention includes the following steps: Step S1: Real-time monitoring of the elevator operation status based on the elevator energy-saving box; Step S2: Establishing a first driving power prediction model to predict the driving power required by the elevator; Step S3: Establishing a second driving power prediction model to predict the driving power provided by the power grid; Step S4: Judging whether reactive power compensation is required through a compensation judgment model; Step S5: Receiving a reactive power compensation instruction and calculating a reactive power compensation index; Step S6: Calculating the reactive power compensation capacity based on the reactive power compensation index; Step S7: Completing the reactive power compensation for the energy-saving drive of the elevator. In summary, an elevator energy-saving drive control method with a power grid reactive power governance function can accurately predict the driving power required by the elevator and the driving power that the power grid can provide by real-time monitoring of the elevator operation status, thereby realizing precise control of the elevator energy-saving drive. During the elevator operation, when it is detected that the driving power provided by the power grid is insufficient to meet the elevator operation requirements, the compensation judgment model will trigger a reactive power compensation mechanism, calculate the reactive power compensation index and then calculate the reactive power compensation capacity, and finally realize the reactive power compensation for the elevator energy-saving drive, which not only optimizes the energy use efficiency of the elevator but also plays a positive role in the stable operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. is a flowchart of an elevator energy-saving drive control method with a power grid reactive power governance function. DETAILED DESCRIPTION OF THE INVENTION

[0029] The technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. In addition, the forms of each structure described in the following embodiments are merely illustrative, and an elevator energy-saving drive control method with a power grid reactive power governance function involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0030] As Figure 1 shown, the present invention provides an elevator energy-saving drive control method with a power grid reactive power governance function, including the following steps:

[0031] Step S1: Real-time monitoring of the elevator operation status based on the elevator energy-saving box: Connect the elevator energy-saving box to the elevator control cabinet, and real-time monitor the elevator operation status through the elevator energy-saving box to collect elevator operation data;

[0032] Step S2: Establishing a first driving power prediction model to predict the driving power required by the elevator: Establish a first driving power prediction model, input the elevator operation data into the model, and predict the driving power required by the elevator based on the elevator operation data;

[0033] Step S3: Establish a second driving power prediction model to predict the driving power provided by the power grid: Monitor the operating status of the power grid in real time through a power grid monitoring device to collect power grid operation data, and establish a second driving power prediction model to predict the driving power provided by the power grid;

[0034] Step S4: Determine whether reactive power compensation is required through a compensation judgment model: Establish a compensation judgment model based on the prediction results of the first driving power prediction model and the second driving power prediction model to determine whether reactive power compensation is required for the elevator;

[0035] Step S6: Receive a reactive power compensation instruction and calculate the reactive power compensation index: Receive a reactive power compensation instruction, establish a mathematical model for calculating the reactive power compensation index, and obtain the reactive power compensation index based on the prediction results of the first driving power prediction model and the second driving power prediction model;

[0036] Step S7: Calculate the reactive power compensation capacity based on the reactive power compensation index: Input the reactive power compensation index as a variable into the reactive power compensation capacity analysis model to obtain the reactive power compensation capacity;

[0037] Step S8: Complete the reactive power compensation for the energy-saving drive of the elevator: The elevator energy-saving box receives the reactive power compensation capacity and completes the reactive power compensation for the energy-saving drive of the elevator.

[0038] In this embodiment, it should be specifically noted that in step S1, the elevator energy-saving box monitors the operating status of the elevator in real time, collects elevator operation data, and the elevator energy-saving box automatically detects the phase of the power grid and automatically synchronizes with the power grid. The elevator operation data includes: the tension value when the elevator moves, the maximum value of the standard load-bearing mass of the elevator, the average speed when the elevator moves, and the drive efficiency of the elevator drive system;

[0039] The elevator energy-saving box has been configured at the factory and no modification is required for on-site installation. If there are special requirements, you can contact the customer service staff to assist in configuring the device through the APP link.

[0040] In this embodiment, it should be specifically noted that in step S2, a first driving power prediction model is established, and the elevator operation data is output to the model, and the driving power required by the elevator is predicted based on the elevator operation data. The calculation formula of the first driving power prediction model is: , where represents the predicted value of the driving power required by the elevator, represents the elevator movement resistance coefficient, represents the tension value when the elevator moves, represents the elevator movement friction coefficient, represents the maximum value of the standard load-bearing mass of the elevator, represents the acceleration due to gravity, represents the average speed when the elevator is moving, represents the drive efficiency of the elevator drive system.

[0041] In this embodiment, it should be specifically noted that in step S3, the power grid monitoring device is used to monitor the operating state of the power grid in real time, collect power grid operation data, and establish a second drive power prediction model to predict the specific content of the drive power provided by the power grid as follows:

[0042] The elevator energy-saving box automatically detects the phase of the power grid and collects power grid operation data, and the power grid operation data includes the standard voltage value provided by the power grid, the standard current value provided by the power grid, and the power grid power factor;

[0043] The calculation formula of the second drive power prediction model is: , where represents the predicted value of the drive power provided by the power grid, represents the standard voltage value provided by the power grid, represents the standard current value provided by the power grid, represents the power grid power factor.

[0044] In this embodiment, it should be specifically noted that in step S4, based on the prediction results of the first drive power prediction model and the second drive power prediction model, a compensation judgment model is established to judge whether reactive power compensation is required for the elevator, and the specific content is as follows:

[0045] Step S41: Based on the prediction results of the first drive power prediction model and the second drive power prediction model, a compensation judgment model is established, and the compensation judgment model is expressed as: , where represents the difference between the predicted value of the drive power required by the elevator and the predicted value of the drive power provided by the power grid, represents the predicted value of the drive power required by the elevator, represents the predicted value of the drive power provided by the power grid;

[0046] Step S42: Judge whether reactive power compensation is required for the elevator according to the difference between the predicted value of the drive power required by the elevator and the predicted value of the drive power provided by the power grid: If the difference between the predicted value of the drive power required by the elevator and the predicted value of the drive power provided by the power grid , it is judged that no reactive power compensation is required for the elevator. If the difference between the predicted value of the drive power required by the elevator and the predicted value of the drive power provided by the power grid , it is judged that reactive power compensation is required for the elevator.

[0047] In this embodiment, it should be specifically noted that in step S5, the specific content of receiving the reactive power compensation instruction, establishing a mathematical model for calculating the reactive power compensation index, and obtaining the reactive power compensation index based on the prediction results of the first driving power prediction model and the second driving power prediction model is as follows:

[0048] Step S51: Calculate the reactive power compensation factor based on the power difference according to the prediction results of the first driving power prediction model and the second driving power prediction model. The calculation formula is: , where represents the reactive power compensation factor based on the power difference, represents the predicted value of the driving power required by the elevator, represents the predicted value of the driving power provided by the power grid;

[0049] Step S52: Take the reactive power compensation factor as a variable and input it into the reactive power compensation index calculation model to obtain the reactive power compensation index before reactive power compensation. The calculation formula is , where represents the reactive power compensation index before reactive power compensation, represents the reactive power compensation factor based on the power difference, represents the reactive energy output by the power grid system before reactive power compensation, represents the reactive energy absorbed by the elevator drive system before reactive power compensation.

[0050] In this embodiment, it should be specifically noted that in step S6, taking the reactive power compensation index before compensation as a variable and inputting it into the reactive power compensation capacity analysis model, the specific content of obtaining the reactive power compensation capacity is as follows:

[0051] Step S61: Calculate the average power index during elevator operation. The calculation formula is: , where represents the average power index during elevator operation, represents the reactive load coefficient during elevator operation, represents the reactive load value during elevator operation, represents the active load coefficient during elevator operation, represents the active load value during elevator operation;

[0052] Step S62: Take the reactive power compensation index before reactive power compensation and the average power index during elevator operation as variables and input them into the reactive power compensation capacity analysis model to obtain the reactive power compensation capacity. The calculation formula is: , where Q represents the reactive power compensation capacity, Represents the predicted value of the driving power required by the elevator, Represents the predicted value of the driving power provided by the power grid, Represents the tangent value of the reactive power compensation index before reactive power compensation, Represents the tangent value of the average power index during elevator operation.

[0053] In this embodiment, it should be specifically noted that in step S7, the elevator energy-saving box receives the reactive power compensation capacity output by the reactive power compensation capacity analysis model, adjusts the reactive power compensation device in the elevator energy-saving box, so that the output of the elevator energy-saving box matches the calculated reactive power compensation capacity, and completes the reactive power compensation for the energy-saving drive of the elevator.

[0054] The main difference between this embodiment and the prior art is that this embodiment has step S1: monitoring the operating state of the elevator in real time according to the elevator energy-saving box, step S2: establishing a first driving power prediction model to predict the driving power required by the elevator, step S3: establishing a second driving power prediction model to predict the driving power provided by the power grid, step S4: judging whether reactive power compensation is required through a compensation judgment model, step S5: receiving a reactive power compensation instruction to calculate the reactive power compensation index, step S6: calculating the reactive power compensation capacity based on the reactive power compensation index, step S7: completing the reactive power compensation for the energy-saving drive of the elevator. In short, an elevator energy-saving drive control method with a power grid reactive power governance function can accurately predict the driving power required by the elevator and the driving power that the power grid can provide by monitoring the operating state of the elevator in real time, so as to achieve precise control of the energy-saving drive of the elevator; during the operation of the elevator, when it is detected that the driving power provided by the power grid is insufficient to meet the operating requirements of the elevator, the compensation judgment model will trigger the reactive power compensation mechanism, calculate the reactive power compensation capacity by calculating the reactive power compensation index, and finally achieve the reactive power compensation for the energy-saving drive of the elevator, which not only optimizes the energy use efficiency of the elevator, but also plays a positive role in the stable operation of the power grid.

[0055] Finally: The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0056] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An elevator energy-saving drive control method with grid reactive power governance function, characterized in that: It includes the following steps: Step S1: Real-time monitoring of the elevator operation status based on the elevator energy-saving box: Connect the elevator energy-saving box to the elevator control cabinet, and through the elevator energy-saving box, real-time monitor the elevator operation status and collect elevator operation data; Step S2: Establish a first driving power prediction model to predict the driving power required by the elevator: Establish a first driving power prediction model, input the elevator operation data into the model, and predict the driving power required by the elevator based on the elevator operation data; Step S3: Establish a second driving power prediction model to predict the driving power provided by the power grid: Through the power grid monitoring device, real-time monitor the operation status of the power grid and collect power grid operation data, and establish a second driving power prediction model to predict the driving power provided by the power grid; Step S4: Judge whether reactive power compensation is required through the compensation judgment model: Based on the prediction results of the first driving power prediction model and the second driving power prediction model, establish a compensation judgment model to judge whether reactive power compensation is required for the elevator; Step S5: Receive the reactive power compensation instruction and calculate the reactive power compensation index: Receive the reactive power compensation instruction, establish a mathematical model for calculating the reactive power compensation index, and obtain the reactive power compensation index based on the prediction results of the first driving power prediction model and the second driving power prediction model; Step S6: Calculate the reactive power compensation capacity based on the reactive power compensation index: Take the reactive power compensation index as a variable and input it into the reactive power compensation capacity analysis model to obtain the reactive power compensation capacity; Step S7: Complete the reactive power compensation for the energy-saving drive of the elevator: The elevator energy-saving box receives the reactive power compensation capacity, and completes the reactive power compensation for the energy-saving drive of the elevator.

2. The elevator energy-saving drive control method with power grid reactive power governance function according to claim 1, wherein: In the said step S1, through the elevator energy-saving box, real-time monitor the elevator operation status and collect elevator operation data. The elevator operation data includes: the tension value when the elevator moves, the maximum value of the elevator standard load-bearing mass, the average speed when the elevator moves, and the drive efficiency of the elevator drive system.

3. A method for elevator energy-saving drive control with grid reactive power governance function according to claim 1, characterized in that: In the step S2, a first driving power prediction model is established, elevator operation data is output to the model, and the driving power required by the elevator is predicted according to the elevator operation data. The calculation formula of the first driving power prediction model is: , where represents the predicted value of the driving power required by the elevator, represents the elevator movement resistance coefficient, represents the tension value during elevator movement, represents the elevator movement friction coefficient, represents the maximum value of the standard load-bearing mass of the elevator, represents the acceleration due to gravity, represents the average speed during elevator movement, represents the driving efficiency of the elevator drive system.

4. A method for elevator energy-saving drive control with power grid reactive power governance function according to claim 1, characterized in that: In the step S3, the operation state of the power grid is monitored in real time by a power grid monitoring device to collect power grid operation data, and a second driving power prediction model is established to predict the driving power provided by the power grid. The calculation formula of the second driving power prediction model is as follows: , where represents the predicted value of the driving power provided by the power grid, represents the standard voltage value provided by the power grid, represents the standard current value provided by the power grid, represents the power factor of the power grid.

5. A method for elevator energy-saving drive control with grid reactive power governance function according to claim 1, characterized in that: In the said step S4, based on the prediction results of the first driving power prediction model and the second driving power prediction model, establish a compensation judgment model to judge whether reactive power compensation is required for the elevator. The specific content is as follows: Step S41: Establish a compensation judgment model based on the prediction results of the first driving power prediction model and the second driving power prediction model. The compensation judgment model is expressed as: , where represents the difference between the predicted value of the driving power required by the elevator and the predicted value of the driving power provided by the power grid, represents the predicted value of the driving power required by the elevator, represents the predicted value of the driving power provided by the power grid; Step S42: Determine whether reactive power compensation is required for the elevator based on the difference between the predicted value of the driving power required by the elevator and the predicted value of the driving power provided by the power grid: If the difference between the predicted value of the driving power required by the elevator and the predicted value of the driving power provided by the power grid , it is determined that reactive power compensation is not required for the elevator. If the difference between the predicted value of the driving power required by the elevator and the predicted value of the driving power provided by the power grid , it is determined that reactive power compensation is required for the elevator.

6. The elevator energy-saving drive control method with power grid reactive power governance function according to claim 1, characterized in that: In the said step S5, receive the reactive power compensation instruction, establish a mathematical model for calculating the reactive power compensation index, and obtain the reactive power compensation index based on the prediction results of the first driving power prediction model and the second driving power prediction model. The specific content is as follows: Step S51: Calculate the reactive power compensation factor based on the power difference according to the prediction results of the first driving power prediction model and the second driving power prediction model. The calculation formula is: , where represents the reactive power compensation factor based on the power difference, represents the predicted value of the driving power required by the elevator, represents the predicted value of the driving power provided by the power grid; Step S52: Input the reactive power compensation factor as a variable into the reactive power compensation index calculation model to obtain the reactive power compensation index before reactive power compensation. The calculation formula is , where represents the reactive power compensation index before reactive power compensation, represents the reactive power output by the power grid system before reactive power compensation, represents the reactive power absorbed by the elevator drive system before reactive power compensation.

7. A method for elevator energy-saving drive control with grid reactive power governance function according to claim 1, characterized in that: In the said step S6, take the reactive power compensation index before compensation as a variable and input it into the reactive power compensation capacity analysis model to obtain the reactive power compensation capacity. The specific content is as follows: Step S61: Calculate the average power index during elevator operation. The calculation formula is as follows: , where represents the average power index during elevator operation, represents the reactive load coefficient during elevator operation, represents the reactive load value during elevator operation, represents the active load coefficient during elevator operation, represents the active load value during elevator operation; Step S62: Take the reactive power compensation index before reactive power compensation and the average power index during elevator operation as variables and input them into the reactive power compensation capacity analysis model to obtain the reactive power compensation capacity. The calculation formula is: , where Q represents the reactive power compensation capacity, represents the tangent value of the reactive power compensation index before reactive power compensation, represents the tangent value of the average power index during elevator operation, represents the predicted value of the driving power required by the elevator, represents the predicted value of the driving power provided by the power grid.

8. A method for elevator energy-saving drive control with grid reactive power governance function according to claim 1, characterized in that: In the said step S7, the elevator energy-saving box receives the reactive power compensation capacity output by the reactive power compensation capacity analysis model, adjusts the reactive power compensation device in the elevator energy-saving box, so that the output of the elevator energy-saving box matches the calculated reactive power compensation capacity, and completes the reactive power compensation for the energy-saving drive of the elevator.

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