JP2018188268A - Elevator device and elevator control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the operation of an elevator from being stopped as much as possible during a power failure such as an instantaneous power failure.SOLUTION: The elevator device includes a power failure detection unit 9 for detecting a power failure of an input AC power supply and a control unit 12 which sets the nearest floor as a stop floor of a car when a power failure is detected by the power failure detection unit 9 and changes the traveling speed or the acceleration of the car to the suppressed traveling speed or acceleration by an electric motor 6. By changing the traveling speed or the acceleration of the car to the suppressed traveling speed or the acceleration during a power failure, the time of driving the elevator can be prolonged with power accumulated in a smoothing capacitor 4, which is connected to an input side of an inverter 5, during the power failure so that a possibility of stopping the car at the nearest floor can be improved.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an elevator apparatus and an elevator control method.

  The elevator apparatus is an apparatus that converts a three-phase AC power supplied from the outside into a DC power, supplies the converted DC power to an inverter, and drives a motor with the AC power obtained by the inverter.

Such an elevator apparatus makes an emergency stop of a car in operation when a power failure occurs. If the elevator device has an emergency power supply, it may continue to operate using the emergency power supply even during a power outage, but there are elevator devices that do not have an emergency power supply. is there.
Patent Document 1 describes a technique for detecting an abnormality such as a power failure of a power source supplied to an elevator apparatus.

JP 2001-302132 A

By the way, in addition to the power failure that lasts for a relatively long time of several seconds or more, there is a power failure called a so-called instantaneous power failure, in which a power failure occurs for a very short time of less than 1 second. This instantaneous power failure occurs due to various factors such as switching of the power transmission system on the electric power company side and some malfunction in the power receiving equipment in the building.
Even in the event of a momentary power failure, the elevator controller detects the occurrence of a power failure in the same manner as a normal power failure for a relatively long time, so that the car stops in an emergency.

  When the car is in an emergency stop, it is necessary to resume operation after a power failure recovery through a predetermined power recovery procedure. For this reason, even if the power outage itself is an instantaneous power outage, the operation may not be resumed quickly even if it is recovered immediately. In particular, if a car stops in the middle of a hoistway that is not the original stop position due to the occurrence of a power failure, it may take time to rescue passengers in the car. Even if it exists, it is not preferable that the car stops in the middle of the hoistway.

  An object of the present invention is to provide an elevator control device and an elevator control method that can prevent the operation of an elevator from stopping when a power failure such as an instantaneous power failure occurs.

In order to solve the above problems, for example, the configuration described in the claims is adopted.
The present application includes a plurality of means for solving the above problems. To give an example, a converter for converting an input AC power source into a DC power source and a DC power source converted by the converter into an AC power source for driving a car. Input AC from the inverter to be converted, the electric motor driven by the AC power source for driving the car output from the inverter, the smoothing capacitor connected to the DC power input side of the inverter, and the DC power source output from the input AC power source or converter When the power outage detection unit detects a power outage and the power outage detection unit detects a power outage, the stop floor of the car is set as the nearest floor, and the travel speed or acceleration of the car by the motor is suppressed. Or a control unit that performs control to change the acceleration and extend the time that can be driven by the electric power stored in the smoothing capacitor. It is obtained by the Ta apparatus.

According to the present invention, when a power failure occurs, the time during which the car can be driven by the electric power stored in the smoothing capacitor connected to the input side of the inverter can be extended. Can be stopped on the floor.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a block diagram which shows the example of the whole structure by the example of 1 embodiment of this invention. It is a block diagram which shows the example of the hardware constitutions of the computer applied to the elevator control apparatus by one embodiment of this invention. It is a characteristic view which shows the example of the change with the time of the power supply voltage at the time of the power failure by one embodiment of this invention. It is a characteristic view which shows the example of the change by the time of the power supply at the time of the power failure by one embodiment of this invention. It is a flowchart which shows the example of a control process at the time of the power failure generation by the example of 1 embodiment of this invention.

Hereinafter, an embodiment of the present invention (hereinafter referred to as “this example”) will be described with reference to the accompanying drawings.
[1. overall structure]
FIG. 1 is a diagram illustrating an example of the overall configuration of the elevator apparatus of the present example.
The elevator apparatus of this example is supplied with a commercial power source 1 that is a three-phase AC power source from the outside. The commercial power source 1 is supplied to the converter diode 3 via the electromagnetic contactor 2 and converted into a DC power source. The DC power converted by the converter diode 3 is converted by the inverter 5 into an AC power for driving the car, and the converted AC power for driving the car is supplied to the electric motor 6. The AC power output from the inverter 5 is set in an output state such as a frequency by a command from the control unit 12 described later.

  A smoothing capacitor 4 is connected to the transmission path of the DC power source between the converter diode 3 and the inverter 5. The smoothing capacitor 4 is for smoothing the voltage of the DC power source output from the converter diode 3 to a constant voltage. Since the smoothing capacitor 4 is connected to the DC power supply input side of the inverter 5, the DC power supplied to the inverter 5 becomes a stable voltage, whereby the inverter 5 can perform a stable conversion operation.

  A main rope 13 is wound around the electric motor 6. A counterweight 7 is attached to one end of the main rope 13 and a car 8 is attached to the other end. Then, the car 8 travels in the hoistway when the main rope 13 is wound up by the electric motor 6. Here, in accordance with an instruction from the control unit 12, the frequency of the AC power output from the inverter 5 is set, and the rotation state of the electric motor 6 is controlled at the set frequency. That is, the traveling position (elevating position) of the car 8 is controlled by the control unit 12.

  The control unit 12 is operated by a power source (for example, a DC power source) obtained by the control power source circuit 11 to which the commercial power source 1 is supplied. The control power supply circuit 11 also includes a smoothing capacitor (not shown) for stabilizing the converted DC power supply when the commercial power supply 1 is converted. Note that the control power circuit 11 may include a power failure auxiliary power source that operates when the commercial power source 1 is powered down.

The voltage of the DC power source output from the converter diode 3 is detected by the voltage detector 10. A power failure detection unit 9 is connected to the voltage detection unit 10. The power failure detection unit 9 performs a power failure detection process for the commercial power source 1 based on the voltage value detected by the voltage detection unit 10. The power failure detected here includes an instantaneous power failure that occurs for a very short time. Moreover, when the power failure is recovered, the power failure detection unit 9 also detects the power failure recovery.
The control part 12 performs control operation at the time of a power failure when the power failure detection part 9 detects a power failure or a power failure recovery. Although details of the control operation at the time of a power failure will be described later, here, control is performed to suppress the traveling speed of the main rope 13 by the electric motor 6 so that the electric power accumulated in the smoothing capacitor 4 is maintained as much as possible.

  A car interior control unit 14 is disposed in the car 8. The in-car controller 14 controls operations of equipment (load devices) such as lighting equipment, in-car operation panel, guidance display device, and surveillance camera attached to the car 8. Further, the in-car control unit 14 instructs the control unit 12 on the stop floor or the like based on the operation status of the stop floor instruction button or the like disposed on the in-car operation panel. The device attached to the car 8 is operated by a power source supplied from, for example, the control power circuit 11.

[2. Computer hardware configuration example applied to the control unit]
The control unit 12 is configured by a computer, for example.
FIG. 2 is a diagram illustrating a hardware configuration example of a computer constituting the control unit 12.
The computer C functioning as the control unit 12 includes a CPU (Central Processing Unit) C1, a ROM (Read Only Memory) C2, and a RAM (Random Access Memory) C3 connected to the bus line C10. Further, the computer C includes a nonvolatile storage C4, a network interface C5, an input device C6, and a display device C7.

  The CPU C1 reads out the program code of software that realizes each function provided in the control unit 12 from the ROM C2, and executes it. In the RAM C3, variables, parameters, and the like generated during the arithmetic processing are temporarily written. For example, the control part 12 performs the process which controls driving | running | working of the passenger car 8 by CPU C1 reading the program memorize | stored in ROM C2. Further, the program stored in the ROM C2 includes a program for performing a power failure process described later.

  As the nonvolatile storage C4, for example, an HDD (Hard disk drive), an SSD (Solid State Drive), a flexible disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory, or the like is used. It is done. In addition to the OS (Operating System) and various parameters, a program for causing the computer C to function as the control unit 12 is recorded in the nonvolatile storage C4.

As the network interface C5, for example, a NIC (Network Interface Card) or the like is used, and various data can be transmitted / received via a LAN (Local Area Network) to which a terminal is connected, a dedicated line, or the like. For example, the control unit 12 is connected to a monitoring device (not shown) from the network interface C5 via a LAN cable or the like. Also, the car control unit 14 is connected to the computer C through the network interface C5.
The input device C6 includes a keyboard, a mouse, and the like. The display device C7 is configured by a liquid crystal display or the like. These input device C6 and display device C7 are used, for example, during maintenance work of the elevator apparatus. The computer C configuring the control unit 12 may be configured not to include the input device C6 and the display device C7.

[3. Control processing during power failure]
Next, the control operation of the control unit 12 when the power failure detection unit 9 of the elevator apparatus of this example detects a power failure will be described.
First, before describing the control operation at the time of a power failure, the power supply voltage drop characteristic when a power failure occurs will be described.
FIG. 3 shows an example in which a commercial power supply 1 power failure occurs at timing ta, and the voltage of the DC power supplied from the converter diode 3 to the inverter 5 decreases. In FIG. 3, the vertical axis represents the voltage value [V], and the horizontal axis represents the time [ms].

  When a power failure occurs at timing ta, the voltage of the DC power source supplied to the inverter 5 gradually decreases from the rated voltage. Here, the characteristic P1 when the rated load is applied, that is, when the car 8 is driven by the electric motor 6 in the normal operation state, is several tens of times from the occurrence of a power failure at the timing ta to the minimum operating voltage at which the electric motor 6 can be driven. ms]. Therefore, in a state where the rated load is maintained, the electric motor 6 stops operating several tens [ms] after the occurrence of a power failure at the timing ta, and the car 8 stops traveling. The time from the occurrence of the power failure to the minimum operating voltage is determined by the capacity of the smoothing capacitor 4 connected between the converter diode 3 and the inverter 5. The smoothing capacitor 4 is configured with a relatively small capacity for smoothing the DC power supply. Generally, as shown in FIG. 3, the smoothing capacitor 4 reaches the minimum operating voltage in several tens [ms] after the occurrence of a power failure.

Here, a case where the traveling speed of the car 8 by the electric motor 6 is limited as compared with the rated load (during normal operation) will be considered. The characteristic P2 in FIG. 3 shows an example when the speed limit mode in which the traveling speed of the car 8 is suppressed to a speed slower than that at the rated load is set.
The characteristic P2 in the speed limit mode reaches the minimum operating voltage V1 that can drive the electric motor 6 in hundreds of tens [ms] from the occurrence of a power failure at the timing ta. In other words, when the time difference between the time until the operation minimum voltage V1 is reduced with the characteristic P1 at the rated load and the time until the operation is reduced to the operation minimum voltage V1 with the characteristic P2 in the speed limit mode is t1, the time difference t1 is From several tens [ms] to one hundred [ms]. Therefore, the speed limit mode characteristic P2 can secure a longer time to reach the minimum operating voltage than the characteristic P1 at the rated load.

  FIG. 4 shows an example of characteristics at the time of a power failure relating to the control power output from the control power circuit 11. The vertical axis in FIG. 4 is the power [W] of the control power source, and the horizontal axis is the time [ms]. FIG. 4 also shows the case where a power failure of the commercial power source 1 occurs at the timing ta.

  When a power failure occurs at the timing ta, the control power output from the control power circuit 11 gradually decreases from the maximum output. Here, the characteristic P3 when the load is large, that is, when all the load devices of the elevator apparatus are operated in the normal state, is several tens of times from the occurrence of a power failure at the timing ta to the minimum operation power W1 that can be controlled as the elevator apparatus. Reach in [ms]. Therefore, when the normal operation state is maintained, the normal operation cannot be maintained as the elevator apparatus in several tens [ms] after the occurrence of the power failure at the timing ta.

Here, a characteristic P4 when a part of the load device of the elevator apparatus is stopped is shown in FIG.
The characteristic P4 at the time of reducing the load reaches the minimum operation power W1 that can be controlled as an elevator device in hundreds of tens [ms] from the occurrence of a power failure at timing ta. That is, the time difference between the time until the characteristic P3 when the load device is operating in the normal state is reduced to the minimum operating voltage and the time until the characteristic P4 when the load device is reduced in load is reduced to the minimum operating voltage. Assuming t2, this time difference t2 is about several tens [ms] to one hundred [ms]. Therefore, in the characteristic P4 at the time of reducing the load, it is possible to secure a long time for the load to reach the minimum operating voltage as compared with the characteristic P3 in the normal state.
In addition, about some apparatuses, such as the control part 12 with which the elevator apparatus of this example is provided, even if power supply stops by a power failure, power is supplied from an emergency battery etc. (not shown) To do.

Based on the characteristics shown in FIG. 3 and FIG. 4, the control unit 12 of this example is controlled so as to operate appropriately as much as possible even during a power failure by changing the operation mode as an elevator device when a power failure occurs. The
The flowchart of FIG. 5 is a flowchart showing a control process executed by the control unit 12 during a power failure.
First, when a power failure occurs in the commercial power supply 1 (step S11), the power failure detection unit 9 outputs a power failure detection signal (step S12).

  When the power failure detection signal output from the power failure detection unit 9 is supplied to the control unit 12, the control unit 12 determines whether or not the car 8 is currently traveling (moving up and down) (step S13). Here, when it is determined that the car 8 is traveling (YES in Step S13), the vehicle speed is low with energy calculated from the voltage value detected by the voltage detection unit 10 and a threshold at which the car 8 can be driven at low speed. When the speed is limited to, it is determined whether or not it is possible to drive to the nearest floor (step S14).

  If it is determined in step S14 that the vehicle can be driven to the nearest floor by limiting the speed to a low speed (YES in step S14), the traveling speed of the car 8 is changed to the low speed mode (step S15). Changing the traveling speed of the car 8 to the low speed mode corresponds to switching from the operation at the characteristic P1 by the rated load shown in FIG. 3 to the operation at the characteristic P2 in which the speed is limited.

  Furthermore, the control unit 12 suppresses power supply to the load device that is not related to the traveling of the car 8 (step S16). For example, the brightness of lighting fixtures in the car 8 is reduced to reduce power consumption, the guidance display device is stopped, and the guidance display on the guidance display device is temporarily stopped. Take the correspondence. Here, the suppression of the power supply to the load device corresponds to switching from the operation state at the characteristic P3 with a large load shown in FIG. 4 to the operation state at the characteristic P4 where the load is reduced.

Further, the control unit 12 changes the landing floor of the traveling car 8 from the destination floor indicated by the destination floor button or the like to the nearest floor of the current position (step S17). The nearest floor here is the nearest floor in the current traveling direction.
Thereafter, the control unit 12 determines whether or not the commercial power source 1 has recovered from the power failure (step S18). Here, when the commercial power source 1 recovers from the power failure (YES in step S18), the control unit 12 returns the traveling speed of the car 8 from the low speed mode to the normal mode and supplies power to the load device. The suppression is released (step S19).

  Then, after the processing in step S19 is performed and when no power recovery from the power failure of the commercial power source 1 is detected in step S18 (NO in step S18), after the car 8 arrives at the nearest floor The control unit 12 performs control so as to announce that the user has landed on the nearest floor due to the occurrence of a power failure (step S20).

After the announcement in step S20, the control unit 12 further determines whether or not the commercial power source 1 has recovered from the power failure (step S21). When power recovery is detected (YES in step S21), the control unit 12 returns the operation mode of the elevator apparatus to the normal mode (automatic operation mode) in which automatic operation is performed (step S23).
In step S21, when power recovery has not been detected and power failure has continued (NO in step S21), the control unit 12 shuts off the power output from the inverter 5 to the electric motor 6, and the car 8 The stopped operation stop state is maintained (step S22).

  In step S13, if the car 8 is not traveling (NO in step S13), the process proceeds to step S21. Furthermore, when it is determined in step S14 that driving to the nearest floor at low speed is impossible (NO in step S14), the control unit 12 cuts off the power output from the inverter 5 to the electric motor 6 and stops the car. 8 is emergency stopped and the emergency stop state is maintained (step S24).

  As described above, according to the elevator apparatus of the present example, when the commercial power source 1 fails, the traveling car 8 immediately changes to traveling in the low speed mode upon detection of the power failure and is connected to the inverter 5. The possibility of being able to operate up to the nearest floor with the electric power charged in the smoothing capacitor 4 is increased. That is, as the traveling speed becomes low, the distance that the car 8 can travel with the electric power charged in the smoothing capacitor 4 is extended, and it is possible to drive to the nearest floor as much as possible. Further, power consumption unrelated to traveling of the lighting fixtures in the car 8 is also suppressed, and from this point, the possibility of driving to the nearest floor can be increased.

  Also, if it is determined in step S18 that the power has been restored from the power failure, the normal speed mode is automatically activated when the power failure is an instantaneous power failure by removing the travel speed limitation or load suppression. After returning to the operation mode and arriving at the nearest floor, the operation can be continued immediately.

[4. Modified example]
In the above-described embodiment, low-speed operation is performed as an operation state that is restricted when a power failure occurs. On the other hand, when a power failure occurs, the acceleration when driving the car 8 by the electric motor 6 may be limited to a low acceleration.

  Further, the operation time at the rated load and the operation time at the speed limit described in FIG. 3 are examples, and these operation times actually vary depending on the capacity of the smoothing capacitor 4. For example, a smoothing capacitor 4 having a relatively large capacity may be used to increase the possibility that it can be determined that the operation can be performed up to the nearest floor at the time of determination in step S14 in the flowchart of FIG.

  In the embodiment described above, when the traveling speed (or acceleration) is limited to a low speed, the operation of the load device that is not related to traveling is stopped or the processing for suppressing power consumption is combined. You may perform only the process which restricts (or acceleration) to low speed. For example, when an emergency battery is installed in the car 8, since the equipment in the car 8 such as lighting equipment is operated by the emergency battery during a power failure, the power consumption of the load device is suppressed. There is no need to perform processing.

  In addition, as a process of suppressing the power consumption of the load device unrelated to traveling, the process of stopping the operation of the load device in the car 8 or suppressing the power consumption is performed. You may make it perform the stop process of the operation | movement of the load apparatus (for example, guidance apparatus etc. of a landing place), or the suppression process of power consumption.

Furthermore, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail in order to easily understand the present invention, and are not necessarily limited to those having all the configurations described.
Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit.

Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files that realize each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.
Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

  DESCRIPTION OF SYMBOLS 1 ... Commercial power supply, 2 ... Electromagnetic contactor, 3 ... Converter diode, 4 ... Smoothing capacitor, 5 ... Inverter, 6 ... Electric motor, 7 ... Balance weight, 8 ... Ride car, 9 ... Power failure detection part, 10 ... DC voltage detection 11, control power supply circuit, 12 control unit, 13 main rope, 14 car control unit, C computer, C 1 CPU, C 2 ROM, C 3 RAM, C 4 nonvolatile storage, C 5 network Interface, C6 ... Input device, C7 ... Display device, C10 ... Bus line

Claims (5)

A converter diode that converts input AC power to DC power;
An inverter that converts the DC power converted by the converter diode into a car driving AC power;
An electric motor driven by a car driving AC power output from the inverter;
A smoothing capacitor connected to the DC power input side of the inverter;
A power failure detection unit that detects a power failure of the input AC power source from the DC power source output from the input AC power source or the converter diode;
When the power failure detection unit detects a power failure, the stop floor of the car is set as the nearest floor, and the traveling speed or acceleration of the car by the electric motor is changed to a suppressed traveling speed or acceleration, An elevator device comprising: a control unit that performs control to extend a time that can be driven by electric power stored in a smoothing capacitor. Furthermore, when the said power failure detection part detects a power failure, the said control part stops the load apparatus which does not affect the driving | running | working of the said car, or suppresses power consumption. When the power failure detection unit detects a power failure recovery after a power failure, the control unit returns the traveling speed or acceleration of the car by the electric motor from the suppressed traveling speed or acceleration to the normal traveling speed or acceleration. The elevator apparatus according to claim 1, wherein the elevator car is moved to the nearest floor. When the power failure detection unit detects a power failure, the control unit determines whether the DC power source voltage converted by the converter diode and the current traveling position of the car can move to the nearest floor. When the vehicle can move to the nearest floor, the running speed or acceleration of the car by the electric motor is changed to a suppressed running speed or acceleration, and when the car cannot move to the nearest floor, the car is emergency stopped. The elevator apparatus according to 1. In an elevator control method for converting an input AC power source into a DC power source using a converter diode, then converting the input AC power source into a car driving AC power source using an inverter, and driving the motor with the converted car driving AC power source.
A power failure detection process for detecting a power failure of the input AC power source from the DC power source output from the input AC power source or the converter diode;
When a power failure is detected by the power failure detection process, the stop floor of the car is set as the nearest floor, and the traveling speed or acceleration of the car by the electric motor is changed to a suppressed traveling speed or acceleration, And a control process for extending the time that can be driven by the electric power stored in the smoothing capacitor connected to the input side of the inverter.

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