CN114044418B - A method for power optimization of elevator emergency power supply - Google Patents

Abstract

The invention discloses a control method for minimizing the power demand of an elevator emergency power supply, which is characterized in that, when the emergency power supply is working, the elevator control system controls the running speed of the elevator motor according to the actual working situation, and cooperates with an appropriate optimization control method to meet the In the case of use requirements, the emergency power supply required by the elevator control system is minimized.

Description

A method for power optimization of elevator emergency power supply

technical field

The invention relates to elevator control technology, in particular to a method for optimizing the power of an elevator emergency power supply.

Background technique

With the development of society, elevators have become a necessary vertical transportation tool for people's daily travel. Elevators have high requirements on power supply. Once a power outage occurs, it may cause sleepiness and reduce customer satisfaction. For this reason, in the scene where the elevator power supply is unstable or there are frequent power outages, the owner or the elevator company generally configures an emergency power supply in order to reduce the impact of the elevator power failure. There are generally two types of this configuration. One is that the building itself has a backup power supply. When the backup power supply is used, one or more elevators can be allowed to run; brake, let the elevator run to the door area and release the passengers.

When choosing to be equipped with emergency power supply by the elevator itself, the current technology is to make the elevator run towards the light load direction (the elevator motor is generating electricity) according to the preset speed, so as to reduce the requirement on the power of the emergency power supply. However, due to the following reasons, the emergency power supply in the current market cannot be effectively reduced: the power consumption of the control system and the power consumption of the elevator motor itself have not been considered; the power consumption is related to the current, that is, to the current car load of the elevator running ; Even if they are all generating electricity, the power loss of the elevator motor itself is also related to the load of the car.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for optimizing the power of an elevator emergency power supply in view of the shortcomings of the prior art, so as to reduce the requirement on the power of the emergency power supply.

In order to achieve the above object, a method for optimizing the power of an elevator emergency power supply according to the present invention, when the emergency power supply is working, the elevator control system controls the running speed of the elevator motor according to the actual working conditions, and cooperates with an appropriate optimization control method to meet the use requirements. In the case of the elevator control system, the emergency power supply required by the elevator control system is minimized.

In a preferred embodiment of the present invention, the elevator control system controls the running speed of the elevator motor according to the actual working conditions, specifically means that when the emergency power supply is working, if the elevator car is not in the door area, it needs to perform leveling operation; At this time, the elevator control system monitors the output power of the emergency power supply, and by controlling the running speed and direction of the elevator car, the power of the emergency power supply required by the elevator control system is minimized when the elevator control system meets the use requirements.

In a preferred embodiment of the present invention, the elevator control system monitors the output power of the emergency power supply, and by controlling the running speed and direction of the elevator car, the elevator control system can use the required emergency power supply The specific steps for minimum power are as follows:

First of all, the elevator control system will select the running direction according to the car load or running torque, and try to make the elevator motor run in the power generation state;

Secondly, when the elevator motor performs electric operation, the elevator control system controls the speed of the elevator car to make the elevator car run at a lower speed, so that the input power of the elevator control system is less than the rated power of the emergency power supply; , the elevator control system controls the speed of the elevator car to minimize the input power required by the elevator control system.

In a preferred embodiment of the present invention, the input power of the elevator control system is obtained by direct measurement or estimation or a combination of direct measurement and estimation.

In a preferred embodiment of the present invention, the estimation method is to estimate according to the power of each component of the elevator control system in normal operation and the real-time power of the elevator motor.

In a preferred embodiment of the present invention, the power acquisition mode of each component of the elevator control system when it is working normally is obtained through pre-testing and stored in the storage unit of the elevator control system.

In a preferred embodiment of the present invention, the power of each component of the elevator control system in normal operation and the real-time power of the elevator motor running are obtained by establishing a model and calculating.

In a preferred embodiment of the present invention, the method for determining whether the elevator motor performs electric operation and the elevator motor performs power generation operation is as follows: when the elevator starts to run, the input power of the elevator motor is a positive value, and as the elevator car speed The input power of the elevator motor changes with the speed; when the speed of the elevator car increases, if the input power of the elevator motor becomes larger, it means that the elevator motor is running electrically; when the speed of the elevator car increases, If the input power of the elevator motor remains unchanged, decreases, or even becomes negative, it means that the elevator motor is generating electricity.

In a preferred embodiment of the present invention, when controlling the running speed of the elevator car, the running speed of the elevator car should be limited within a certain range, so as to avoid inefficiency caused by too low speed, or risk caused by too high speed.

In a preferred embodiment of the present invention, the appropriate optimized control method includes optimized drive control, reasonable control of auxiliary power consumption, appropriate relaxation of the detection margin for drive-related faults, allowing restart when the operation is not smooth, and running When it is not smooth, it is allowed to restart and run one of them in the opposite direction or a combination of any two or more.

In a preferred embodiment of the present invention, the optimized drive control specifically selects an appropriate PWM modulation method according to the input power of the elevator motor.

In a preferred embodiment of the present invention, the rational control of the auxiliary power means to stop the display of the outbound call panel, stop the display of the internal call panel, reduce the display brightness of the outbound call panel, reduce the display brightness of the internal call panel, stop Or reduce the rotation speed of the fan of the elevator car, the rotation speed of the fan of the control cabinet, or a combination of any two or more.

In a preferred embodiment of the present invention, the appropriate relaxation of the detection margin of the drive-related fault refers to the proper relaxation of the detection margin of the voltage fault or the detection margin of the speed deviation fault.

In a preferred embodiment of the present invention, the permission to restart when the operation is not smooth refers to that the emergency power supply or the elevator control system will start running again when the output power of the emergency power supply is too large or the elevator control system controls the elevator to run abnormally.

In a preferred embodiment of the present invention, when the operation is not smooth, allowing the restart to run in the opposite direction means that if the elevator control system judges that the previous operation was electric operation, it will control the elevator motor to run in the opposite direction when the operation is restarted. .

In a preferred embodiment of the present invention, when the elevator control system satisfies the use requirements, it refers to satisfying the user's quality requirements for elevator operation in the case of emergency power supply, and these requirements include but not limited to running speed and comfort.

The operating principle of the method for elevator emergency power supply power optimization of the present invention is:

The elevator control system monitors the flow of electric energy when the emergency power supply is working, controls the running speed of the elevator motor according to the actual working conditions, and cooperates with other optimization controls to make the entire elevator system meet the needs of use. The required emergency power supply is the smallest. Since the load of the elevator car and the running speed of the elevator motor determine the power of the elevator motor when it is running, this power is a negative value when it is powered, and it is a positive value when it is powered. The main invention of the present invention is to control the running speed of the elevator, thereby controlling the running power of the elevator motor, so as to achieve the purpose of minimizing the required emergency power supply. The specific content is as follows: When the emergency power supply is working, if the elevator car is not in the door area, it needs to perform leveling operation. At this time, the elevator control system monitors the output power of the emergency power supply, and takes the minimum value as the control target. By controlling the running speed and direction of the elevator, the power of the emergency power supply required by the entire elevator system is minimized when the use requirements are met. First of all, the elevator control system will select the running direction according to the car load or running torque, and try to make the elevator motor run in the power generation state. The two ends of the elevator motor are hung with the car and the counterweight respectively. When the quality of the car and its load is close to that of the counterweight, due to the existence of friction, there may be such a situation that the elevator motor runs in two directions. are in electric operation. Power needs to be absorbed from the emergency source, but due to the low mass deviation, the required power is not large. When the load deviation on both sides exceeds the influence of friction, the elevator control system will choose to run in the direction of light load, and the elevator motor is in the power generation state at this time. Secondly, when the elevator motor is running electrically, it needs to absorb power from the power supply. In theory, the lower the speed of the elevator motor is, the lower the required power is. At this time, the elevator control system controls the speed of the elevator, so that the elevator runs at a lower speed, so that the input power of the elevator control system is less than the rated power of the emergency power supply; Consume some power. When the speed of the car is running slowly, the power generated by the elevator motor is not enough to meet its own consumption, so it still needs to absorb power from the emergency power supply. As the speed of the car increases, the power generated by the elevator motor will increase. The power absorbed by the power supply will be reduced. The control system minimizes the input power required by the control system by controlling the running speed of the car, that is, the minimum power of the emergency power supply. The present invention also includes a supporting optimized control method, including optimizing the control of the variable frequency drive, selecting a suitable PWM modulation mode according to the input power of the elevator motor, so as to minimize the power loss of the frequency converter; rationally controlling the power consumption of the auxiliary power supply, such as stopping outgoing calls or The display of the internal call panel, or reduce its display brightness, stop or reduce the fan rotation of the elevator car and the control cabinet, etc.; in the emergency power supply operation mode, appropriately relax the detection margin of the drive-related faults, so that the control system is sensitive to speed deviations, etc. Insensitive, the operation of the emergency power supply can be completed without affecting safety; when the output power of the power supply is too large or the elevator control system controls the elevator to run abnormally, the emergency power supply or the elevator control system will start running again; if the elevator control system judges that the previous operation If it is electric operation, then when the operation is started again, the elevator motor is controlled to run in the opposite direction, and multiple attempts can be made.

Description of drawings

In order to illustrate the technical solution of the present invention more clearly, the accompanying drawings used in the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings on the premise of not paying creative work.

Fig. 1 is a structural representation of the present invention; Among the figure: 1 is an emergency power supply, 2 is an elevator control system, 3 is an elevator motor, and 4 is an elevator car.

Detailed ways

The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in FIG. 1 , by controlling the running speed of the elevator car 4 , the running power of the elevator motor 3 is controlled, so as to achieve the purpose of requiring the minimum power of the emergency power supply 1 . The specific content is as follows: when the emergency power supply 1 is working, if the elevator car 4 is not in the door area, leveling operation is required. At this time, the elevator control system 2 monitors the output power of the emergency power supply 1, and takes the minimum value as the control target. By controlling the running speed and direction of the elevator, the power of the emergency power supply 1 required by the entire elevator system is minimized under the condition that the use requirements are met. First, the elevator control system 2 will select the running direction according to the car load or running torque, and try to make the elevator motor 3 run in the power generation state. The two ends of the elevator motor 3 are hung with the car and the counterweight respectively. When the quality of the car and its load is relatively close to that of the counterweight, due to the existence of friction, there may be such a situation that the elevator motor 3 will move toward the two sides. Direction running is in electric running state. Power needs to be absorbed from the emergency power source 1, but due to the small deviation in mass, the required power is not large. When the load deviation on both sides exceeds the influence of the friction force, the elevator control system 2 will choose to run in the direction of light load, and the elevator motor 3 is now in the power generation state. Secondly, when the elevator motor 3 is running electrically, it needs to absorb power from the power supply. In theory, the lower the running speed of the elevator motor 3 is, the lower the required power is. Now the elevator control system 2 controls the speed of the elevator, so that the elevator runs at a lower speed, so that the input power of the elevator control system 2 is less than the rated power of the emergency power supply 1; 3 windings, etc., need to consume part of the power. When the speed of the car is running slowly, the electricity generated by the elevator motor 3 is not enough to meet its own consumption, so it still needs to absorb power from the emergency power supply 1. With the increase of the running speed of the car, the power generated by the elevator motor 3 will increase. The power absorbed from the emergency power source 1 will be reduced. The control system minimizes the input power required by the control system by controlling the running speed of the car, that is, the power of the emergency power supply 1 is minimum. The present invention also includes a matching optimized control method, including optimizing the control of the variable frequency drive, selecting a suitable PWM modulation method according to the input power of the elevator motor 3, so as to minimize the power loss of the frequency converter; reasonably controlling the power consumption of the auxiliary power supply, such as stopping the outgoing call Or the display of the internal call panel, or reduce its display brightness, stop or reduce the fan rotation of the elevator car and the control cabinet, etc.; in the emergency power supply 1 operation mode, appropriately relax the detection margin of the drive-related faults, so that the control system can control the speed The deviation is not sensitive, and the operation of the emergency power supply 1 is completed without affecting safety; when the output power of the power supply is too large or the elevator control system 2 controls the elevator to run abnormally, the emergency power supply 1 or the elevator control system 2 will start running again; the elevator control system If the system 2 judges that the previous operation was an electric operation, then when the operation is started again, the elevator motor 3 is controlled to run in the opposite direction, and multiple attempts can be made.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (13)

1. The power optimization method for the elevator emergency power supply is characterized by comprising the following steps of: when the emergency power supply works, the elevator control system controls the running speed of the elevator motor according to the actual working condition, and the elevator control system is matched with a proper optimization control method, so that the emergency power supply power required by the elevator control system is minimized under the condition of meeting the use requirement;

the elevator control system controls the running speed of the elevator motor according to the actual working condition, specifically, when the emergency power supply works, if the elevator car is not at the door zone position, the elevator car needs to run in a flat layer; at this time, the elevator control system monitors the output power of the emergency power supply, and the running speed and the running direction of the elevator car are controlled, so that the power of the emergency power supply required by the elevator control system is minimum under the condition of meeting the use requirement;

the elevator control system monitors the output power of the emergency power supply, and controls the running speed and direction of the elevator car to ensure that the elevator control system has the following specific steps of minimizing the power of the emergency power supply under the condition of meeting the use requirement:

firstly, an elevator control system selects a running direction according to the load or running torque of a car, so that an elevator motor runs in a power generation state as much as possible;

secondly, when the elevator motor runs electrically, the elevator control system controls the speed of the elevator car, so that the elevator car runs at a lower speed, and the input power of the elevator control system is smaller than the rated power of the emergency power supply; when the elevator motor performs power generation operation, the elevator control system controls the speed of the elevator car, so that the input power required by the elevator control system is minimum;

the judging method for the electric operation of the elevator motor and the power generation operation of the elevator motor comprises the following steps: when the elevator starts to operate, the power input by the elevator motor is positive, and the input power of the elevator motor changes along with the speed of the elevator car; when the speed of the elevator car is increased, if the input power of the elevator motor is increased, the elevator motor is indicated to be in electric operation; when the speed of the elevator car is increased, if the input power of the elevator motor is unchanged, becomes smaller or even becomes negative, the elevator motor is indicated to be in power generation operation.

2. A method of power optimization of an elevator emergency power supply as defined in claim 1, wherein: the input power of the elevator control system is obtained by adopting a direct measurement mode or an estimation mode or a direct measurement and estimation combination mode.

3. A method of power optimization of an elevator emergency power supply as defined in claim 2, wherein: the estimation mode is to estimate according to the power of each component of the elevator control system when the component works normally and the real-time power of the elevator motor.

4. A method of power optimization of an elevator emergency power supply as defined in claim 2, wherein: the power obtaining mode of each component of the elevator control system during normal operation is obtained through pre-testing and is stored in a storage unit of the elevator control system.

5. A method of power optimization of an elevator emergency power supply as defined in claim 2, wherein: the power of each component of the elevator control system during normal operation and the real-time power of the elevator motor operation are obtained through modeling calculation.

6. A method of power optimization of an elevator emergency power supply as defined in claim 1, wherein: the running speed of the elevator car should be limited to a certain range when controlling the running speed of the elevator car, avoiding that the speed is too low to cause inefficiency or that the speed is too high to cause risks.

7. A method of power optimization of an elevator emergency power supply as defined in claim 1, wherein: the method comprises the steps of optimizing driving control, reasonably controlling auxiliary power supply power consumption, properly relaxing detection margin of related driving faults, allowing restarting when operation is not smooth, and allowing restarting to operate in the opposite direction when operation is not smooth.

8. The method for optimizing power of an elevator emergency power supply of claim 7, wherein: the optimized driving control is specifically to select a proper PWM modulation mode according to the input power of the elevator motor.

9. The method for optimizing power of an elevator emergency power supply of claim 7, wherein: the reasonable control auxiliary power supply electricity utilization means one or more than two of stopping the display of the outbound panel, stopping the display of the inbound panel, reducing the display brightness of the outbound panel, reducing the display brightness of the inbound panel, stopping or reducing the fan rotation speed of the elevator car and the fan rotation speed of the control cabinet.

10. The method for optimizing power of an elevator emergency power supply of claim 7, wherein: the detection margin of the proper relaxation drive related faults refers to the detection margin of the proper relaxation voltage faults or the detection margin of the speed deviation faults.

11. The method for optimizing power of an elevator emergency power supply of claim 7, wherein: the permission to restart when the operation is unsmooth refers to restarting the operation of the emergency power supply or the elevator control system when the output power of the emergency power supply is too large or the elevator control system controls the elevator to operate abnormally.

12. The method for optimizing power of an elevator emergency power supply of claim 7, wherein: when the operation is unsmooth, the restarting is allowed to run in the opposite direction, namely, if the elevator control system judges that the previous operation is the electric operation, the elevator motor is controlled to run in the opposite direction when the operation is restarted.

13. A method of power optimization of an elevator emergency power supply as defined in claim 1, wherein: the elevator control system meets the quality requirements of elevator operation by users in the case of emergency power, including but not limited to operation speed and comfort.

Images