CN113625809B - Bus voltage threshold calculation method and bus voltage control method - Google Patents
Bus voltage threshold calculation method and bus voltage control method Download PDFInfo
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- CN113625809B CN113625809B CN202110857142.XA CN202110857142A CN113625809B CN 113625809 B CN113625809 B CN 113625809B CN 202110857142 A CN202110857142 A CN 202110857142A CN 113625809 B CN113625809 B CN 113625809B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
- B66B1/28—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
- B66B1/3415—Control system configuration and the data transmission or communication within the control system
- B66B1/3423—Control system configuration, i.e. lay-out
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
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- Elevator Control (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present application relates to a bus voltage threshold value calculation method, a bus voltage control method, a bus voltage threshold value calculation device, a bus voltage control device, a computer apparatus, a bus voltage control system, and a storage medium. The method comprises the following steps: acquiring initial bus voltage of a non-energy feedback elevator system; the initial bus voltage refers to the bus voltage when the controller outputs a first control signal and the running speed of the elevator motor is zero; the first control signal is used for indicating the IGBT module in the frequency converter to be conducted so as to enable the elevator motor to start running; and calculating according to the initial bus voltage and the safety margin to obtain a bus voltage threshold value. By adopting the method, the bus voltage threshold can be flexibly set according to the initial bus voltage and the safety margin directly corresponding to the external power grid voltage, so that the bus voltage threshold is closer to the voltage of the actual external power grid, the loss of the IGBT module of the frequency converter is reduced, and the service life and the reliability of the IGBT module are improved.
Description
Technical Field
The present invention relates to the field of elevator control technologies, and in particular, to a bus voltage threshold calculation method, a bus voltage control method, a bus voltage threshold calculation apparatus, a bus voltage control apparatus, a computer device, a bus voltage control system, and a storage medium.
Background
With the development of elevator frequency conversion control technology, conventional elevator driving technology is divided into two types, namely energy feedback and non-energy feedback. The non-energy feedback elevator system mainly controls the conduction of the regeneration release module according to the detected bus voltage of the non-energy feedback elevator system and a fixed preset bus voltage threshold value, so that the regenerated energy of an elevator motor in a power generation state is consumed, and the bus voltage of the non-energy feedback elevator system is in a stable state. However, the fixed preset bus voltage threshold value in the conventional method is high, which causes the loss of the IGBT module of the frequency converter of the non-energy feedback elevator system during the operation process to be too large, thereby affecting the service life and reliability of the IGBT module.
Disclosure of Invention
In view of the above, it is necessary to provide a bus voltage threshold calculation method, a bus voltage control method, a bus voltage threshold calculation device, a bus voltage control device, a computer device, a bus voltage control system, and a storage medium for solving the above technical problems, so as to reduce the loss of the IGBT module of the frequency converter in the operation process of the non-energy feedback elevator system, thereby prolonging the lifetime of the IGBT module and improving the reliability of the IGBT module.
In one embodiment, a bus voltage threshold calculation method is provided and applied to a non-energy feedback elevator system, wherein the non-energy feedback elevator system comprises a controller, a frequency converter and an elevator motor; the controller is used for controlling the conduction state of an IGBT module in the frequency converter so as to control the running state of an elevator motor; the controller is also used for controlling the conduction state of the regeneration release module in the frequency converter according to the bus voltage threshold value of the non-energy feedback elevator system so as to control the bus voltage of the non-energy feedback elevator system; the method comprises the following steps:
acquiring initial bus voltage of a non-energy feedback elevator system; the initial bus voltage refers to the bus voltage when the controller outputs a first control signal and the running speed of the elevator motor is zero; the first control signal is used for indicating the IGBT module in the frequency converter to be conducted so as to enable the elevator motor to start running;
and calculating according to the initial bus voltage and the safety margin to obtain a bus voltage threshold value.
In one embodiment, the step of calculating according to the initial bus voltage and the safety margin to obtain the bus voltage threshold further includes: counting a first target energy and a second target energy in the running process of an elevator motor; the first target energy refers to energy output to the frequency converter by the elevator motor; the second target energy refers to energy consumed by a regeneration discharge module in the frequency converter; calculating a difference between the second target energy and the first target energy; judging whether the difference is larger than a preset multiple of the first target energy; if yes, the bus voltage threshold is increased.
In one embodiment, the step of increasing the bus voltage threshold comprises: and increasing the bus voltage threshold according to the safety margin, and returning to the step of counting the first target energy and the second target energy for iterative processing until the difference is less than the preset multiple of the first target energy.
In one embodiment, the step of counting the first target energy and the second target energy comprises: acquiring a first target current and a second target current; the first target current is the current output by the elevator motor to the IGBT module in the frequency converter; the second target current is the current flowing into the regeneration release module in the frequency converter; calculating according to the first target current to obtain first target energy; and calculating according to the second target current to obtain second target energy.
In one embodiment, a bus voltage control method is provided and applied to a non-energy feedback elevator system, wherein the non-energy feedback elevator system comprises a controller, a frequency converter and an elevator motor; the controller is used for controlling the conduction state of an IGBT module in the frequency converter so as to control the running state of an elevator motor; the controller is also used for controlling the conduction state of the regeneration release module in the frequency converter according to the bus voltage threshold value of the non-energy feedback elevator system so as to control the bus voltage of the non-energy feedback elevator system; the method comprises the following steps: the controller acquires bus voltage; if the bus voltage is greater than the bus voltage threshold value, the controller outputs a second control signal; the second control signal is used for indicating the conduction of a regeneration release module in the frequency converter so as to reduce the voltage of the bus; calculating and determining a bus voltage threshold according to the initial bus voltage and the safety margin; the initial bus voltage is the bus voltage when the controller outputs the first control signal and the running speed of the elevator motor is zero; the first control signal is used for indicating the IGBT module in the frequency converter to be conducted so as to enable the elevator motor to start running. In one embodiment, a bus voltage threshold calculation device is provided, which is applied to a non-energy feedback elevator system comprising a controller, a frequency converter and an elevator motor; the controller is used for controlling the conduction state of an IGBT module in the frequency converter so as to control the running state of an elevator motor; the controller is also used for controlling the conduction state of the regeneration release module in the frequency converter according to the bus voltage threshold value of the non-energy feedback elevator system so as to control the bus voltage of the non-energy feedback elevator system; the above-mentioned device includes: the first acquisition module is used for acquiring the initial bus voltage of the non-energy feedback elevator system; the initial bus voltage refers to the bus voltage when the controller outputs a first control signal and the running speed of the elevator motor is zero; the first control signal is used for indicating the IGBT module in the frequency converter to be conducted so as to enable the elevator motor to start running; and the threshold value calculating module is used for calculating according to the initial bus voltage and the safety margin to obtain the bus voltage threshold value.
In one embodiment, a bus voltage control device is provided, which is applied to a non-energy feedback elevator system, wherein the non-energy feedback elevator system comprises a controller, a frequency converter and an elevator motor; the controller is used for controlling the conduction state of an IGBT module in the frequency converter so as to control the running state of an elevator motor; the controller is also used for controlling the conduction state of the regeneration release module in the frequency converter according to the bus voltage threshold value of the non-energy feedback elevator system so as to control the bus voltage of the non-energy feedback elevator system; the above-mentioned device includes: the second acquisition module is used for acquiring the bus voltage by the controller; the voltage control module is used for outputting a second control signal by the controller if the bus voltage is greater than the bus voltage threshold value; the second control signal is used for indicating the conduction of a regeneration release module in the frequency converter so as to reduce the voltage of the bus; calculating and determining a bus voltage threshold according to the initial bus voltage and the safety margin; the initial bus voltage is the bus voltage when the controller outputs the first control signal and the running speed of the elevator motor is zero; the first control signal is used for indicating the IGBT module in the frequency converter to be conducted so as to enable the elevator motor to start running.
In one embodiment, a computer device is provided that includes a memory, a processor, and an acquisition apparatus. The memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In one embodiment, there is provided a bus voltage control system, the system comprising: a voltage detection device and a control device; wherein the control device comprises a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of the embodiment of the bus voltage control method. The voltage detection device is connected with the control device and is used for detecting the bus voltage and the initial bus voltage.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
The bus voltage threshold value calculation method, the bus voltage control method, the bus voltage threshold value calculation device, the bus voltage control device, the computer equipment, the bus voltage control system and the storage medium are used for obtaining the initial bus voltage of the non-energy feedback elevator system; and then, calculating according to the initial bus voltage and the safety margin to obtain the bus voltage threshold. In the embodiment, the bus voltage threshold can be flexibly set according to the initial bus voltage directly corresponding to the external power grid voltage and the safety margin, so that the bus voltage threshold is closer to the voltage of the actual external power grid; the bus voltage after the regeneration release module is conducted can be controlled to be as close to the external power grid voltage as possible by the controller according to the bus voltage threshold, the bus voltage of the non-energy feedback elevator system is guaranteed to meet the requirement that the bus voltage is higher than the external power grid voltage, and meanwhile the bus voltage can be stably kept at a lower voltage value, so that the loss of an IGBT module of the frequency converter is reduced, and the service life and the reliability of the IGBT module are improved.
Drawings
FIG. 1 is a diagram of an exemplary bus voltage threshold calculation method or bus voltage control method;
FIG. 2 is a schematic diagram of a first process of a bus voltage threshold calculation method according to an embodiment;
FIG. 3 is a second flowchart of a bus voltage threshold calculation method according to an embodiment;
FIG. 4 is a schematic flow chart illustrating the steps of counting the first target energy and the second target energy according to one embodiment;
FIG. 5 is a schematic flow chart diagram illustrating a method for bus voltage control according to one embodiment;
FIG. 6 is a first block diagram of a bus voltage threshold calculation device in one embodiment;
FIG. 7 is a second block diagram showing a bus voltage threshold calculation device according to an embodiment;
FIG. 8 is a block diagram of an energy statistics module in one embodiment;
FIG. 9 is a block diagram showing the structure of a bus voltage control device according to an embodiment;
FIG. 10 is a diagram of the internal structure of a computer device in one embodiment;
FIG. 11 is an internal block diagram of a bus voltage control system in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
With the development of elevator frequency conversion control technology, conventional elevator driving technology is divided into two types of energy feedback and non-energy feedback. The non-energy feedback elevator is characterized in that on the control method of the bus voltage, the conduction of the regeneration release module is controlled mainly according to the detected bus voltage of the non-energy feedback elevator system and a fixed preset bus voltage threshold value, so that the energy output to a frequency converter by an elevator motor is consumed, and the bus voltage of the non-energy feedback elevator system is kept in a stable state. Since the fixed bus voltage threshold must be higher than the rectified dc voltage corresponding to the maximum value of the external network voltage. In the conventional case, a preset fixed bus voltage threshold is set to a higher fixed value, which is higher than the rectified dc voltage corresponding to the maximum of all the estimated external grid voltages. When the bus voltage is higher than a preset fixed bus voltage threshold value, a controller in the non-energy feedback elevator system controls a corresponding regeneration release module in the frequency converter to be conducted, so that the regenerated energy of the elevator motor in a discharge state is consumed through the regeneration release module, the bus voltage of the non-energy feedback elevator system is reduced, and the bus voltage of the non-energy feedback elevator system is kept in a stable state. However, since the preset fixed bus voltage threshold is set to a high fixed value, the bus voltage of the non-energy feedback elevator system is also stably at a high fixed value, i.e., the bus voltage threshold. However, the switching loss of the IGBT module in the frequency converter is directly related to the bus dc voltage when the IGBT module operates, and under the condition that the bus voltage of the non-energy feedback elevator system is also stably at a higher fixed value, i.e., the bus voltage threshold, the loss of the IGBT module of the frequency converter in the operation process of the non-energy feedback elevator system is inevitably excessive, thereby affecting the lifetime and reliability of the IGBT module.
Therefore, the embodiment of the application provides a bus voltage threshold value calculation method, a bus voltage control method, a bus voltage threshold value calculation device, a bus voltage control device, computer equipment, a bus voltage control system and a storage medium, which can reduce the loss of an IGBT module of a frequency converter in the operation process of a non-energy feedback elevator system, thereby prolonging the service life of the IGBT module and improving the reliability of the IGBT module.
Next, an application environment of the bus voltage threshold calculation method provided in the embodiment of the present application will be briefly described.
In one specific example, as shown in fig. 1, the application environment is a non-energy feedback elevator system that may include a controller 100, a frequency converter 200, and an elevator motor 300. The frequency converter 200 includes a regenerative bleeding module 210 and an IGBT module 220. The controller 100 is connected to the regenerative bleeding module 210 and the IGBT module 220; the regenerative bleed-off module 210 is connected to a bus of the non-energy feedback elevator system; the IGBT module 220 is connected to an elevator motor 300. The controller 100 may control the on state of the IGBT module 220 in the frequency converter 200, thereby controlling the operation state of the elevator motor 300; for example, when the controller controls the IGBT module 220 to be turned on, the elevator motor 300 starts to operate. The controller 100 can also control the conduction state of the regenerative bleed-off module 210 in the frequency converter 200 according to the bus voltage threshold of the non-energy feedback elevator system, so as to control the bus voltage of the non-energy feedback elevator system; for example, the controller 100 controls the conduction of the regeneration bleed-off module 210 in the frequency converter 200 according to the bus voltage threshold of the non-energy feedback elevator system, and the regeneration bleed-off module 210 consumes the energy output by the elevator motor 300 to the frequency converter 200, thereby reducing the bus voltage of the non-energy feedback elevator system.
In one embodiment, as shown in fig. 2, a bus voltage threshold calculation method is provided, which is described by taking the method as an example of being applied to the non-energy feedback elevator system in fig. 1, the non-energy feedback elevator system includes a controller 100, a frequency converter 200, and an elevator motor 300; wherein, the controller 100 is used for controlling the conduction state of the IGBT module 220 in the frequency converter 200 to control the running state of the elevator motor 300; the controller 100 is further configured to control a conduction state of the regenerative bleed-off module 210 in the frequency converter 200 according to a bus voltage threshold of the non-energy feedback elevator system to control a bus voltage of the non-energy feedback elevator system. The bus voltage threshold calculation method includes steps 202 to 204.
The initial bus voltage is a bus voltage when the controller 100 outputs the first control signal and the operation speed of the elevator motor 300 is zero; the first control signal is used to instruct the IGBT module 230 in the frequency converter 200 to turn on so that the elevator motor 300 starts to operate. That is, the controller 100 acquires the bus voltage of the non-energy feedback elevator system when the elevator motor 300 is powered on to start running and the operating speed of the elevator motor 300 is zero as the initial bus voltage of the non-energy feedback elevator system; since the speed at which the elevator motor operates is zero at this time, the elevator motor does not output energy to the frequency converter, i.e. the above-mentioned initial bus voltage may directly correspond to the voltage of the external electricity network.
In a specific example, the controller 100 may be directly connected to a bus of the non-energy feedback elevator system to obtain the initial bus voltage, and the controller 100 may also obtain the initial bus voltage through a voltage detection device connected to the non-energy feedback elevator system, which are only specific examples, and may be flexibly set according to requirements in practical applications, and are not limited herein.
And 204, calculating according to the initial bus voltage and the safety margin to obtain a bus voltage threshold value.
Calculating according to the initial bus voltage and the safety margin obtained in the step, and obtaining a bus voltage threshold value; the expression of the bus voltage threshold is as follows:
U threshold(s) ＝U First stage +U Surplus
Wherein, U Threshold(s) Is the bus voltage threshold; u shape First stage Is the initial bus voltage; u shape Surplus Is a safety margin.
In one embodiment, the safety margin may be, but is not limited to, determined based on a safety margin coefficient and an initial bus voltage; wherein, the expression of the safety margin is as follows:
U surplus ＝U First stage ×η
Wherein, U Surplus For a safety margin, U First stage And eta is the initial bus voltage and the safety margin coefficient.
In one specific example, when the controller 100 outputs a first control signal to instruct the IGBT module 230 to turn on, so that the elevator motor 300 starts to operate and the operating speed of the elevator motor 300 is zero, the initial bus voltage of the non-energy feedback elevator system is obtained as direct current 530V; since the operating speed of the elevator motor is zero at this time, the elevator motor 300 is not yet in a power generating state, and the bus voltage at this time, i.e., the initial bus voltage dc 530V, may correspond to the voltage ac 380V of the external power grid. If the preset safety margin coefficient is 10%, the safety margin is 53V dc, that is, the bus voltage threshold is 583V dc. The above is only a specific example, and the practical application can be flexibly set according to requirements, and is not limited herein.
Based on the method, the initial bus voltage of the non-energy feedback elevator system is obtained; and then, calculating according to the initial bus voltage and the safety margin to obtain the bus voltage threshold. In the embodiment, the bus voltage threshold can be flexibly set according to the initial bus voltage directly corresponding to the external power grid voltage and the safety margin, so that the bus voltage threshold is closer to the voltage of the actual external power grid; the controller 100 can control the bus voltage of the regenerated discharging module 210 after being conducted to be as close to the external power grid voltage as possible according to the bus voltage threshold, so that the bus voltage of the non-energy feedback elevator system can meet the requirement of being higher than the external power grid voltage, and the bus voltage can be stably kept at a lower voltage value, the loss of the IGBT module of the frequency converter is reduced, and the service life and the reliability of the IGBT module are improved.
In one embodiment, as shown in fig. 3, the step of calculating according to the initial bus voltage and the safety margin to obtain the bus voltage threshold further includes steps 206 to 212.
And step 206, counting the first target energy and the second target energy in the running process of the elevator motor.
Wherein, the first target energy is the energy output from the elevator motor 300 to the frequency converter 200; the second target energy refers to energy consumed by the regenerative bleed-off module 210 in the frequency converter 200. During the operation of the elevator motor 300, the controller 100 counts the energy output from the elevator motor 300 to the frequency converter 200, i.e., the first target energy, and the energy consumed by the regenerative discharging module 210, i.e., the second target energy.
In one embodiment, as shown in fig. 4, the step of counting the first target energy and the second target energy comprises steps 402 to 406.
The first target current is the current output by the elevator motor 300 to the IGBT module 220 in the frequency converter 200; the second target current refers to a current flowing into the regenerative bleed-off module 210 in the frequency converter 200.
In a specific example, the controller 100 may, but is not limited to, obtain the first target current through a current sensor disposed between the elevator motor 300 and the IGBT module 220 in the frequency converter 200, and the controller 100 may, but is not limited to, obtain the second target current through a current sensor disposed at a junction of a busbar of the non-energy feedback elevator system and the regenerative bleed-off module 210 in the frequency converter 200, which are merely specific examples, and may be flexibly set according to requirements in practical applications, and are not limited herein.
And step 404, calculating according to the first target current to obtain first target energy.
And 406, calculating according to the second target current to obtain second target energy.
The controller 100 obtains a first target current and a second target current respectively; then, the first target energy, which is the energy output from the elevator motor 300 to the frequency converter 200, is calculated according to the first target current, and the second target energy, which is the energy consumed by the regenerative discharge module 210, is calculated according to the second target current.
In one specific example, the controller 100 obtains a first target current and a second target current respectively; then, calculating according to the first target current and the voltage between the elevator motor and the frequency converter to obtain the energy output from the elevator motor 300 to the frequency converter 200, namely the first target energy; and calculating according to the second target current and the bleeder resistance to obtain second target energy. The above is only a specific example, and the practical application can be flexibly set according to requirements, and is not limited herein. In this embodiment, the calculation is performed according to the first target current and the second target current, so as to accurately obtain the first target energy and the second target energy, thereby facilitating the adjustment of the bus voltage threshold.
In step 208, the difference between the second target energy and the first target energy is calculated.
The controller 100 calculates a difference between the second target energy and the first target energy according to the second target energy and the first target energy, that is, a difference between the energy consumed by the regenerative bleeding module 210 in the inverter 200 and the energy output to the inverter 200 by the elevator motor 300 during the operation of the elevator motor 300.
In step 212, if yes, the bus voltage threshold is increased.
And judging whether the difference value is larger than a preset multiple of the first target energy or not according to the difference value of the second target energy and the first target energy. In the operation process of the elevator motor 300, the voltage of the external power grid temporarily rises to a large extent, which causes the bus voltage of the non-energy feedback elevator system to be greater than the bus voltage threshold, so as to control the conduction of the regenerative discharging module 210 in the frequency converter 200, so that the regenerative discharging module 210 consumes the energy of the external power grid, and the phenomenon that the difference between the second target energy and the first target energy is greater than the preset multiple of the first target energy also occurs. When the difference between the second target energy and the first target energy is greater than the preset multiple of the first target energy, the controller 100 increases the bus voltage threshold. In one embodiment, the preset multiple may be, but is not limited to, set accordingly according to engineering practice experience; for example, the preset multiple may be set to 5%.
In one embodiment, increasing the bus voltage threshold may, but is not limited to, directly increase the bus voltage threshold to a preset maximum bus voltage threshold through the controller 100, so that the bus voltage of the non-energy feedback elevator system cannot be greater than the increased bus voltage threshold, and energy of the external power grid is prevented from being consumed by mistake by the regeneration bleed-off module 210 in the frequency converter 200, and thus, the external power grid voltage is adapted to temporarily increase to a larger extent by increasing the bus voltage threshold.
In the embodiment, the first target energy and the second target energy are counted during the operation of the elevator motor; then, calculating the difference value between the second target energy and the first target energy; then, judging whether the difference value is larger than a preset multiple of the first target energy; and when the difference between the second target energy and the first target energy is greater than the preset multiple of the first target energy, the bus voltage threshold is increased, so that the bus voltage of the non-energy feedback elevator system cannot be greater than the increased bus voltage threshold, the energy of the external power grid is prevented from being consumed by the regeneration discharge module 210 by mistake, and the situation that the external power grid voltage temporarily rises to a greater extent by increasing the bus voltage threshold is realized.
In one embodiment, the step of increasing the bus voltage threshold comprises: and increasing the bus voltage threshold according to the safety margin, and returning to the step of counting the first target energy and the second target energy for iterative processing until the difference is less than the preset multiple of the first target energy.
Wherein, the expression of the bus voltage threshold value after being increased is as follows:
U increase ＝U Threshold(s) +U Surplus
Wherein, U Increase Is the bus voltage threshold after the increase; u shape Threshold(s) Is the bus voltage threshold; u shape Surplus Is a safety margin.
In one embodiment, the safety margin may be, but is not limited to, determined based on a safety margin coefficient and an initial bus voltage; wherein the expression of the safety margin is as follows:
U surplus ＝U First stage ×η
Wherein, U Surplus For a safety margin, U First stage And eta is the initial bus voltage and the safety margin coefficient.
And the controller 100 increases the bus voltage threshold according to the safety margin, and returns to the step of counting the first target energy and the second target energy to perform iterative processing until the difference between the second target energy and the first target energy is less than the preset multiple of the first target energy.
In this embodiment, the bus voltage threshold is gradually increased according to the safety margin until the difference between the second target energy and the first target energy is smaller than the preset multiple of the first target energy, so that the finally obtained increased bus voltage threshold can not only prevent the regenerative discharging module 210 from erroneously consuming the energy of the external power grid, but also stably maintain the bus voltage at a lower voltage value according to the finally obtained increased bus voltage threshold, so as to reduce the loss of the IGBT module 220 in the frequency converter, and improve the life and reliability of the IGBT module 220.
In one embodiment, as shown in fig. 5, a bus voltage control method is provided, which is described by taking the method as an example of being applied to the non-energy feedback elevator system in fig. 1, the non-energy feedback elevator system includes a controller 100, a frequency converter 200, and an elevator motor 300; wherein, the controller 100 is used for controlling the conduction state of the IGBT module 220 in the frequency converter 200 to control the running state of the elevator motor 300; the controller 100 is further configured to control a conducting state of the regenerative bleed-off module 210 in the frequency converter 200 according to a bus voltage threshold of the non-energy feedback elevator system, so as to control a bus voltage of the non-energy feedback elevator system. The bus voltage threshold calculation method includes steps 502 to 504.
In step 504, if the bus voltage is greater than the bus voltage threshold, the controller outputs a second control signal.
The bus voltage refers to the bus voltage for controlling the non-energy feedback elevator system. Calculating and determining a bus voltage threshold according to the initial bus voltage and the safety margin; the initial bus voltage is a bus voltage when the controller 100 outputs the first control signal and the operation speed of the elevator motor 300 is zero; the first control signal is used for indicating the IGBT module 230 in the frequency converter 200 to be conducted so as to enable the elevator motor to start running; the second control signal is used to instruct the regenerative bleed module 210 in the frequency converter 200 to conduct, so that the bus voltage is lowered.
In one embodiment, only one controller 100 can be provided in the non-energy feedback elevator system, and the controller 100 can send a first control signal to the IGBT module 220 in the frequency converter 200 to instruct the IGBT module 220 in the frequency converter 200 to be turned on, so as to start the operation of the elevator motor; meanwhile, the controller 100 can also output a second control signal to the regenerative bleeding module 210 in the frequency converter 200 to indicate that the regenerative bleeding module 210 in the frequency converter 200 is turned on, so as to lower the bus voltage.
In one embodiment, two controllers 100, namely a first controller and a second controller, can be further arranged in the non-energy feedback elevator system; the first controller is used for sending a first control signal to the IGBT module 230 in the frequency converter 200 to indicate the IGBT module 220 in the frequency converter 200 to be conducted, so that the elevator motor starts to run; the second controller is configured to output a second control signal to the regenerative bleeding module 210 in the frequency converter 200 to instruct the regenerative bleeding module 210 in the frequency converter 200 to be turned on, so as to decrease the bus voltage.
In one particular example, the controller 100 can obtain a bus voltage of the non-energy fed back elevator system through a voltage detection device; when the bus voltage is greater than a bus voltage threshold value calculated and determined according to the initial bus voltage and the safety margin, the controller 100 outputs a second control signal; when receiving the second control signal output by the controller 100, the IGBT unit in the regenerative bleeding module 210 turns on the IGBT unit and the bleeding resistor in the regenerative bleeding module 210, so that the bleeding resistor consumes the energy output by the elevator motor 300 to the frequency converter 200, thereby reducing the bus voltage of the non-energy feedback elevator system; the above is only a specific example, and the practical application can be flexibly set according to requirements, and is not limited herein.
It should be understood that although the various steps in the flow charts of fig. 2-5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-5 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
In one embodiment, as shown in fig. 6, a bus voltage threshold calculation apparatus is provided, which is illustrated as applied to the non-energy feedback elevator system of fig. 1, which includes a controller 100, a frequency converter 200, and an elevator motor 300; the controller 100 is used for controlling the conduction state of the IGBT module 220 in the frequency converter 200 to control the running state of the elevator motor 300; the controller 100 is further configured to control a conduction state of the regenerative bleed-off module 210 in the frequency converter 200 according to a bus voltage threshold of the non-energy feedback elevator system to control a bus voltage of the non-energy feedback elevator system. The apparatus includes a first obtaining module 710 and a threshold calculating module 720.
The first obtaining module 710 is used for obtaining an initial bus voltage of the non-energy feedback elevator system; the initial bus voltage refers to the bus voltage when the controller outputs a first control signal and the running speed of the elevator motor is zero; the first control signal is used for indicating the IGBT module in the frequency converter to be conducted so as to enable the elevator motor to start running;
the threshold calculation module 720 is configured to calculate according to the initial bus voltage and the safety margin, so as to obtain a bus voltage threshold.
In one embodiment, as shown in fig. 7, the bus voltage threshold calculation apparatus further includes an energy statistics module 730, a difference calculation module 740, a threshold determination module 750, and a threshold increase module 760.
The energy counting module 730 is used for counting the first target energy and the second target energy during the operation of the elevator motor 300. The first target energy is energy output to the frequency converter when the elevator motor is in a power generation state; the second target energy is the energy consumed by the regenerative bleed-off module. The difference calculation module 740 is used for calculating the difference between the second target energy and the first target energy. The threshold determination module 750 is configured to determine whether the difference is greater than a preset multiple of the first target energy. The threshold increasing module 760 is configured to increase the bus voltage threshold when the difference is greater than a preset multiple of the first target energy.
In one embodiment, as shown in fig. 8, the energy statistic module 730 includes a current obtaining unit 731, a first energy calculating unit 732, and a second energy calculating unit 733.
The current obtaining unit 731 is configured to obtain a first target current and a second target current. The first target current is the current output by the elevator motor to the IGBT module in the frequency converter; the second target current is the current flowing into the regenerative bleed-off module in the frequency converter. The first energy calculating unit 732 is configured to calculate according to the first target current to obtain a first target energy. The second energy calculation unit 733 is configured to perform calculation according to the second target current to obtain a second target energy.
For the specific definition of the bus voltage threshold value calculating device, reference may be made to the above definition of the bus voltage threshold value calculating method, and details are not described here. The modules in the bus voltage threshold calculation device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, as shown in fig. 9, there is provided a bus voltage control apparatus, which is illustrated as applied to the non-energy feedback elevator system of fig. 1 as an example, the non-energy feedback elevator system includes a controller 100, a frequency converter 200, and an elevator motor 300; the controller 100 is used for controlling the conduction state of the IGBT module 220 in the frequency converter 200 to control the running state of the elevator motor 300; the controller 100 is further configured to control a conduction state of the regenerative bleed-off module 210 in the frequency converter 200 according to a bus voltage threshold of the non-energy feedback elevator system to control a bus voltage of the non-energy feedback elevator system. The apparatus includes a second obtaining module 1010 and a voltage control module 1020.
The second obtaining module 1010 is used for the controller 100 to obtain the bus voltage;
the voltage control module 1020 is configured to output a second control signal by the controller 100 if the bus voltage is greater than the bus voltage threshold. The second control signal is used for indicating the conduction of a regeneration release module in the frequency converter so as to reduce the voltage of the bus; calculating and determining a bus voltage threshold according to the initial bus voltage and the safety margin; the initial bus voltage is the bus voltage when the controller outputs the first control signal and the running speed of the elevator motor is zero; the first control signal is used for indicating the IGBT module in the frequency converter to be conducted so as to enable the elevator motor to start running.
For the specific definition of the bus voltage control device, reference may be made to the above definition of the bus voltage control method, which is not described herein again. The modules in the bus voltage control device can be wholly or partially implemented by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 10. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a bus voltage threshold calculation method or a bus voltage control method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the configuration shown in fig. 10 is a block diagram of only a portion of the configuration associated with the present application, and is not intended to limit the computing device to which the present application may be applied, and that a particular computing device may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided that includes a memory, a processor, and an acquisition apparatus. The memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In one embodiment, as shown in fig. 11, there is provided a bus voltage control system, the system comprising: a voltage detection device 1200 and a control device 1210.
The control device 1210 includes, among other things, a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of the embodiment of the bus voltage control method.
The voltage detection device 1200 is connected to the control device 1210 and is used to detect the bus voltage and the initial bus voltage.
In the bus voltage control system provided in this embodiment, the implementation principle and technical effect of the control device 1210 are similar to those of the above-described embodiment of the bus voltage control method, and are not described herein again.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The bus voltage threshold value calculation method is applied to a non-energy feedback elevator system, wherein the non-energy feedback elevator system comprises a controller, a frequency converter and an elevator motor; the controller is used for controlling the conduction state of an IGBT module in the frequency converter so as to control the running state of the elevator motor; the controller is also used for controlling the conduction state of a regeneration release module in the frequency converter according to the bus voltage threshold value of the non-energy feedback elevator system so as to control the bus voltage of the non-energy feedback elevator system; the method comprises the following steps:
acquiring an initial bus voltage of the non-energy feedback elevator system; the initial bus voltage refers to the bus voltage when the controller outputs a first control signal and the running speed of the elevator motor is zero; the first control signal is used for indicating the IGBT module in the frequency converter to be conducted so as to enable the elevator motor to start running;
calculating according to the initial bus voltage and a safety margin to obtain the bus voltage threshold;
the step of calculating according to the initial bus voltage and the safety margin to obtain the bus voltage threshold value further comprises the following steps:
counting a first target energy and a second target energy during the operation of the elevator motor; the first target energy refers to the energy output to the frequency converter by the elevator motor; the second target energy refers to energy consumed by a regeneration release module in the frequency converter;
calculating a difference between the second target energy and the first target energy;
judging whether the difference value is larger than a preset multiple of the first target energy;
and if so, increasing the bus voltage threshold.
2. The method of claim 1, wherein the step of increasing the bus voltage threshold comprises:
and increasing the bus voltage threshold according to the safety margin, and returning to the step of counting the first target energy and the second target energy for iterative processing until the difference is less than the preset multiple of the first target energy.
3. The method of claim 1, wherein the step of counting the first target energy and the second target energy comprises:
acquiring a first target current and a second target current; the first target current is the current output by the elevator motor to the IGBT module in the frequency converter; the second target current is current flowing into a regeneration release module in the frequency converter;
calculating according to the first target current to obtain the first target energy;
and calculating according to the second target current to obtain the second target energy.
4. The bus voltage control method is characterized by being applied to a non-energy feedback elevator system, wherein the non-energy feedback elevator system comprises a controller, a frequency converter and an elevator motor; the controller is used for controlling the conduction state of an IGBT module in the frequency converter so as to control the running state of the elevator motor; the controller is also used for controlling the conduction state of a regeneration release module in the frequency converter according to the bus voltage threshold value of the non-energy feedback elevator system so as to control the bus voltage of the non-energy feedback elevator system; the method comprises the following steps:
the controller acquires the bus voltage;
if the bus voltage is greater than the bus voltage threshold value, the controller outputs a second control signal; the second control signal is used for indicating a regeneration release module in the frequency converter to be conducted so as to enable the bus voltage to be reduced; after the bus voltage threshold is calculated and determined according to the initial bus voltage and the safety margin, if the difference value of the second target energy and the first target energy in the operation process of the elevator motor is greater than the preset multiple of the first target energy, the bus voltage threshold is increased; the first target energy refers to the energy output to the frequency converter by the elevator motor; the second target energy refers to energy consumed by a regeneration release module in the frequency converter; the initial bus voltage refers to the bus voltage when the controller outputs a first control signal and the running speed of the elevator motor is zero; the first control signal is used for indicating the IGBT module in the frequency converter to be conducted so as to enable the elevator motor to start running.
5. A bus voltage threshold value calculating device is characterized in that the device is applied to a non-energy feedback elevator system, and the non-energy feedback elevator system comprises a controller, a frequency converter and an elevator motor; the controller is used for controlling the conduction state of an IGBT module in the frequency converter so as to control the running state of the elevator motor; the controller is also used for controlling the conduction state of a regeneration release module in the frequency converter according to the bus voltage threshold value of the non-energy feedback elevator system so as to control the bus voltage of the non-energy feedback elevator system; the device comprises:
the first acquisition module is used for acquiring the initial bus voltage of the non-energy feedback elevator system; the initial bus voltage refers to the bus voltage when the controller outputs a first control signal and the running speed of the elevator motor is zero; the first control signal is used for indicating an IGBT module in the frequency converter to be conducted so as to enable the elevator motor to start running;
the threshold value calculating module is used for calculating according to the initial bus voltage and the safety margin to obtain the bus voltage threshold value;
the energy counting module is used for counting the first target energy and the second target energy in the running process of the elevator motor; the first target energy is energy output to the frequency converter when the elevator motor is in a power generation state; the second target energy refers to energy consumed by the regenerative bleed-off module;
the difference value calculating module is used for calculating the difference value between the second target energy and the first target energy;
the threshold judging module is used for judging whether the difference value is larger than a preset multiple of the first target energy;
and the threshold value increasing module is used for increasing the bus voltage threshold value when the difference value is larger than the preset multiple of the first target energy.
6. The apparatus of claim 5, wherein the energy statistic module comprises a current obtaining unit, a first energy calculating unit and a second energy calculating unit;
the current acquisition unit is used for acquiring a first target current and a second target current; the first target current is the current output by the elevator motor to the IGBT module in the frequency converter; the second target current is the current flowing into the regeneration release module in the frequency converter;
the first energy calculating unit is used for calculating according to the first target current to obtain first target energy;
and the second energy calculating unit is used for calculating according to the second target current to obtain second target energy.
7. A bus voltage control device is characterized in that the device is applied to a non-energy feedback elevator system, and the non-energy feedback elevator system comprises a controller, a frequency converter and an elevator motor; the controller is used for controlling the conduction state of an IGBT module in the frequency converter so as to control the running state of the elevator motor; the controller is also used for controlling the conduction state of a regeneration release module in the frequency converter according to the bus voltage threshold value of the non-energy feedback elevator system so as to control the bus voltage of the non-energy feedback elevator system; the device comprises:
the second acquisition module is used for acquiring the bus voltage by the controller;
the voltage control module is used for outputting a second control signal by the controller if the bus voltage is greater than a bus voltage threshold value; the second control signal is used for indicating a regeneration release module in the frequency converter to be conducted so as to reduce the bus voltage; after the bus voltage threshold is calculated and determined according to the initial bus voltage and the safety margin, if the difference value of the second target energy and the first target energy in the operation process of the elevator motor is greater than the preset multiple of the first target energy, the bus voltage threshold is increased; the first target energy refers to the energy output to the frequency converter by the elevator motor; the second target energy refers to energy consumed by a regeneration release module in the frequency converter; the initial bus voltage refers to the bus voltage when the controller outputs a first control signal and the running speed of the elevator motor is zero; the first control signal is used for indicating the IGBT module in the frequency converter to be conducted so as to enable the elevator motor to start running.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 4.
9. A bus voltage control system, the system comprising: a voltage detection device and a control device;
wherein the control device comprises a memory and a processor; the memory stores a computer program; the processor, when executing the computer program, implementing the steps of the method of any one of claims 1 to 4;
the voltage detection device is connected with the control device and is used for detecting the bus voltage and the initial bus voltage.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 4.
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