JP5623558B2 - Elevator control device - Google Patents

Description

  Embodiments described herein relate generally to an elevator control device.

  In conventional elevators, power storage devices such as batteries and capacitors are provided, and power is stored in the power storage device in the event of a power outage to discharge power, enabling operation within the range of stored power even in the event of a power outage. There is something.

JP 2005-89096 A

  When a battery is used as the power storage device, the amount of charge of the battery is determined based on SOC (State Of Charge) indicating the state of charge of the battery, and charging and discharging are controlled according to the SOC. However, since the SOC may change depending not only on the actual charge amount of the battery but also on the ambient temperature, the detected value of the SOC may deviate from the actual charge amount of the battery.

  The present invention has been made in view of the above, and an object of the present invention is to provide an elevator control device that can appropriately detect the amount of charge of a battery.

  The elevator control device of the embodiment includes a battery and a control circuit. The battery is connected to the control power supply of the elevator via a circuit common to the commercial power supply. The control circuit detects the charge state of the battery, controls the charge / discharge of the battery, and further detects the charge amount in steps by dividing the charge amount of the battery with respect to the charge capacity of the battery into a plurality of ranges. Is.

FIG. 1 is a schematic configuration diagram of an elevator apparatus including an elevator control device according to the embodiment. FIG. 2 is an explanatory diagram of an operation mode when the operation of the elevator apparatus is controlled by the elevator control apparatus shown in FIG. FIG. 3 is an explanatory diagram of a battery charge amount detection step. FIG. 4 is an explanatory diagram of charge amount control in the first operation mode. FIG. 5 is an explanatory diagram of charge amount control in the second operation mode.

  Hereinafter, an embodiment of an elevator control device according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

Embodiment
FIG. 1 is a schematic configuration diagram of an elevator apparatus including an elevator control device according to the embodiment. The elevator apparatus 1 shown in the figure includes a converter apparatus 12, a smoothing capacitor 13, an inverter apparatus 14, a hoisting machine 15, a rope 17, a car 18, a counter weight 19, a battery unit 20, a control unit 30, and a control power transformer 32. It is configured to include. Further, the elevator control device 5 according to the present embodiment includes a battery unit 20, a control unit 30, and a control power transformer 32.

  The commercial power supply 11 is a power supply for supplying a three-phase alternating current, and an electric circuit supplied from the commercial power supply 11 includes a converter device 12, a smoothing capacitor 13, and an inverter device 14. Among these, the converter device 12 is a conversion device that converts alternating current supplied from the commercial power supply 11 into direct current. The converter device 12 has converter elements such as a switching element and a diode module, and converts alternating current into direct current. The smoothing capacitor 13 is arranged in a circuit between the converter device 12 and the inverter device 14 and rectifies the direct current converted by the converter device 12.

  The inverter device 14 includes a switching element, a diode, and the like, and is output from the converter device 12 and converted into direct current by switching the direct current smoothed by the smoothing capacitor 13 by the switching element. The motor (electric motor) 16 is supplied. The inverter device 14 controls the frequency of the alternating current supplied to the motor 16 of the hoisting machine 15 by controlling the switching element. Converter device 12, smoothing capacitor 13, and inverter device 14 are circuits arranged in series.

  Moreover, the control unit 30 is provided so that the elevator apparatus 1 can be controlled. The control unit 30 is electrically connected to the converter device 12 and the inverter device 14 and controls the converter device 12 and the inverter device 14. Further, the control unit 30 has a control power supply 31, and the control power supply 31 can be supplied with power from at least one of the commercial power supply 11 and the battery 22 as described below.

  The control power supply 31 and the commercial power supply 11 are connected via a circuit 27, a contactor 26, a circuit 28, and a control power transformer 32. Among these, the circuit 27 connects the commercial power supply 11 and the contactor 26. The circuit 28 connects the contactor 26 and the control power transformer 32. The contactor 26 is a switch device that connects and disconnects the commercial power supply 11 and the control power transformer 32. The control power transformer 32 steps down the voltage (for example, 200 V) on the commercial power supply 11 side to a voltage for the control power supply 31 (for example, 24 V) and outputs the voltage. A three-phase sine wave is input from the commercial power supply 11 to the control power supply transformer 32. In addition, a three-phase AC voltage of the commercial power supply 11 is input to the battery 22 during normal times, and a two-phase rectangular wave is output from the battery 22 during a power failure.

  The battery unit 20 includes a charge / discharge control circuit 21, a battery 22, and contactors 23, 24, and 25. The battery 22 is a chargeable / dischargeable power storage device. The charge / discharge control circuit 21 is electrically connected to the control unit 30 and is provided as a control circuit that controls charge / discharge of the battery 22 in cooperation with the control unit 30. Further, the charge / discharge control circuit 21 performs opening / closing control of each contactor 23, 24, 25. The charge / discharge control circuit 21 is connected to the circuit 27 via the contactor 23. The contactor 23 is a switch device that connects and disconnects the charge / discharge control circuit 21 and the commercial power supply 11. The charge / discharge control circuit 21 is connected to the circuit 28 through the contactor 24. In the present embodiment, the charge / discharge control circuit 21 is connected to the input tap of the control power transformer 32. The contactor 24 is a switch device that connects and disconnects the charge / discharge control circuit 21 and the control power supply 31. The contactor 25 is a switch device that connects and disconnects the circuit 22 (main circuit) 29 between the smoothing capacitor 13 and the inverter device 14 and the battery 22.

  When receiving power from the commercial power supply 11, the control unit 30 closes the contactor 26 and connects the commercial power supply 11 and the control power supply 31. As a result, the control power supply 31 operates upon receiving power supply from the commercial power supply 11. When receiving power from the commercial power supply 11 to the control power supply 31, the control unit 30 can further output power from the battery 22 to the control power supply 31 for power assist. In this case, the control unit 30 issues a power supply command from the battery 22 to the control power supply 31 to the charge / discharge control circuit 21. Upon receiving the power supply command, the charge / discharge control circuit 21 closes the contactor 24. Thereby, the battery 22 is connected to the control power supply 31 via the charge / discharge control circuit 21, the contactor 24, the circuit 28, and the control power supply transformer 32. The charge / discharge control circuit 21 adjusts the output from the battery 22 to a target voltage and current value and outputs the result to the circuit 28.

  Next, two operation modes of the elevator control device 5 according to this embodiment will be described. The elevator control device 5 can selectively execute two operation modes, a first operation mode and a second operation mode.

  FIG. 2 is an explanatory diagram of an operation mode when the operation of the elevator apparatus is controlled by the elevator control apparatus shown in FIG. In FIG. 2, charging and discharging indicate charging and discharging of the battery 22, respectively. Further, a circle in each column indicates that the battery 22 can be charged or discharged. The first operation mode and the second operation mode are different in operation when purchasing power from the commercial power source 11 and when the commercial power source 11 is powered off.

(Operation in the first operation mode at the time of power purchase)
In the first operation mode at the time of power purchase, the contactors 23 and 26 are closed. The first operation mode is an operation mode in which regenerative power from the motor 16 is not stored. During operation in the regenerative direction in which the heavier one of the car 18 and the counterweight 19 descends, the motor 16 can function as a generator and perform regenerative power generation. In the first operation mode, regenerative power from the motor 16 is not stored in the battery 22. In the first operation mode, when charging the battery 22 at the time of power purchase, the battery 22 is charged by the power purchased from the commercial power supply 11. In the first operation mode, the battery 22 is not used as a power source for the motor 16 during power purchase. The control unit 30 instructs the charge / discharge control circuit 21 to open the contactor 25 in the first operation mode during power purchase. Thereby, the battery 22 is disconnected from the drive circuit of the motor 16, and the motor 16 is rotationally driven by the electric power from the commercial power supply 11. The control unit 30 controls the current value supplied to the motor 16 of the hoisting machine 15 by the inverter device 14, and drives the motor 16 to move up and down the elevator car 18. As described above, in the first operation mode, when the commercial power supply 11 is usable, the charge / discharge control circuit 21 performs only charge control without performing discharge control on the battery 22.

(Operation in the first operation mode at power failure)
At the time of a power failure of the commercial power supply 11, the control unit 30 operates by receiving power supply from the battery 22 to the control power supply 31 instead of the commercial power supply 11. When the commercial power supply 11 fails, the control unit 30 opens the contactor 26 to disconnect the control power supply 31 and the commercial power supply 11, and opens the contactor 23 to disconnect the commercial power supply 11 and the charge / discharge control circuit 21. Further, a control circuit (not shown) in the battery unit 20 instructs the charge / discharge control circuit 21 to supply power from the battery 22 to the control power supply 31. The charge / discharge control circuit 21 closes the contactor 24 and discharges the battery 22 to supply power to the control power supply 31. In addition, the charge / discharge control circuit 21 closes the contactor 25 to connect the battery 22 and the inverter device 14.

  At the time of a power failure in the first operation mode, the regenerative power from the motor 16 is not charged in the battery 22. At the time of a power failure in the first operation mode, the motor 16 is rotationally driven by the battery 22. At the time of a power failure, the motor 16 generates a driving torque by the electric power supplied from the battery 22 via the inverter device 14 and moves the car 18 up and down. As described above, in the first operation mode, the charge / discharge control circuit 21 performs only the discharge control without performing the charge control on the battery 22 when the commercial power supply 11 cannot be used, that is, during a power failure. Further, at the time of a power failure in the first operation mode, the battery 22 supplies power to the control power supply 31 by closing the contactor 24.

(Operation in the second operation mode when purchasing electricity)
In the second operation mode at the time of power purchase, the contactors 23, 25, and 26 are closed. The second operation mode is an operation mode in which regenerative electric power from the motor 16 is stored. In the second operation mode, when charging the battery 22 at the time of power purchase, the battery 22 can be charged by power purchased from the commercial power supply 11 and generated power generated by regeneration of the motor 16. The control unit 30 causes the motor 16 to perform regenerative power generation during operation in the regeneration direction. Electric power generated by regeneration of the motor 16 is charged in the battery 22. The control unit 30 instructs the inverter device 14 to store regenerative power and instructs the charge / discharge control circuit 21 to charge the battery 22. Thus, the inverter device 14 causes the motor 16 to perform regenerative power generation to generate a braking force. The charge / discharge control circuit 21 charges the battery 22 with the power of the regenerative power generation and the received power from the commercial power supply 11.

  Furthermore, in the second operation mode at the time of power purchase, the battery 22 is discharged to assist electric power during powering operation. That is, the control unit 30 closes the contactor 25 and connects the battery 22 and the inverter device 14 when the car 18 is moved up and down with the power supplied from the commercial power supply 11, so that the power is also supplied from the battery 22. Discharge and assist power.

(Operation in second operation mode at power failure)
At the time of a power failure in the second operation mode, regenerative electric power from the motor 16 is stored. The control unit 30 causes the motor 16 to perform regenerative power generation during operation in the regeneration direction. The charge / discharge control circuit 21 closes the contactor 25 and charges the battery 22 with power generated by regeneration of the motor 16. In the second operation mode, the motor 16 operates using the battery 22 as a power source. The control unit 30 closes the contactor 25 to connect the battery 22 and the inverter device 14 and drives the motor 16 to rotate by the discharge power of the battery 22 when the car 18 is moved up and down in the power running direction at the time of a power failure.

  The battery 22 is charged and discharged by the charge / discharge control circuit 21 in accordance with the operation state of the elevator apparatus 1 and the power failure state of the commercial power supply 11 as described above, but the charge / discharge control circuit 21 is charged in the charge state of the battery 22. The charge / discharge control is performed while monitoring the SOC (State Of Charge) indicating. At that time, the charge / discharge control circuit 21 detects the charge amount in a stepwise manner by dividing the SOC of the battery 22 into a plurality of ranges of the charge amount of the battery 22 with respect to the charge capacity of the battery 22.

  FIG. 3 is an explanatory diagram of a battery charge amount detection step. In the elevator control device 5 according to the present embodiment, as shown in FIG. 3, the charge / discharge control circuit 21 changes the charge amount of the battery 22 from 0% to 100% every 10% from step (1) to step ( 10) is divided and set in a range of 10 steps, and it is detected in which step the current charge amount is. For example, when the charge / discharge control circuit 21 detects that the current charge amount X of the battery 22 is 65%, it detects that the current SOC is step (7). Note that the amount of charge may be detected with a width at the time of detection, and it may be detected in which step the current amount of charge is.

  Next, control of the amount of charge of the battery 22 during operation control of the elevator apparatus 1 will be described. FIG. 4 is an explanatory diagram of charge amount control in the first operation mode. During operation control of the elevator apparatus 1, the charge / discharge control circuit 21 sets a target charge amount Ct, which is a target charge amount of the battery 22, and controls the detected charge amount to be the target charge amount Ct. At that time, the charge / discharge control circuit 21 performs charge / discharge control so that the charge amount of the battery 22 falls within one of a plurality of preset steps.

  The charge / discharge control circuit 21 performs different control in the first operation mode and the second operation mode. First, the charge / discharge control in the first operation mode will be described. In the first operation mode, the charge / discharge control circuit 21 does not change the target charge amount Ct, but sets the charge amount to a predetermined amount. 22 charge / discharge control is performed. That is, the charge / discharge control circuit 21 performs charge / discharge control so that the charge amount of the battery 22 falls within one step of the target charge amount Ct.

  For this reason, at the time of power purchase in the first operation mode, which is the time when the commercial power supply 11 can be used in the first operation mode, the charge / discharge is performed so that the charge amount of the battery 22 falls within one step of the target charge amount Ct. The control circuit 21 performs charging control of the battery 22. On the other hand, at the time of a power failure of the commercial power supply 11 in the first operation mode, the charge / discharge control circuit 21 performs the discharge control of the battery 22 without charging with the regenerative power, and the control unit 30 is the power supplied from the battery 22. Thus, the elevator apparatus 1 is operated. For this reason, the elevator apparatus 1 is operated within the range of the charge amount of the battery 22 regardless of the target charge amount Ct.

  FIG. 5 is an explanatory diagram of charge amount control in the second operation mode. In contrast to the first operation mode in which the target charge amount Ct is not changed, in the second operation mode, control is performed by changing the target charge amount Ct according to the time of the day. As the target charge amount Ct in the second operation mode, the charge amount with respect to the usage frequency of the elevator apparatus 1, the operation request level of the elevator apparatus 1 at the time of a power failure, and the like is set in advance according to the time. The charge / discharge control circuit 21 performs charge / discharge control of the battery 22 such that the charge amount of the battery 22 becomes the target charge amount Ct that changes according to the time as described above.

  Specifically, a step is set in advance for the target charge amount Ct according to the time, and the target charge amount Ct is set with a range in the charge amount at each time. That is, the target charge amount Ct is set to change stepwise according to the time. The charge / discharge control circuit 21 performs charge / discharge control of the battery 22 such that the charge amount of the battery 22 falls within a range of steps that become the target charge amount Ct at each time.

  Therefore, at the time of power purchase in the second operation mode, which is the time when the commercial power supply 11 can be used in the second operation mode, the charge amount of the battery 22 is charged so that it falls within the step that becomes the target charge amount Ct at that time. The discharge control circuit 21 performs control for charging with power purchase and regenerative power, and control for discharging power for operating the elevator apparatus 1 together with power for power purchase. On the other hand, during the power failure of the commercial power supply 11 in the second operation mode, the elevator apparatus 1 is operated within the range of the charge amount of the battery 22 while charging with regenerative power regardless of the target charge amount Ct.

  In both the first operation mode and the second operation mode, the charge / discharge control circuit 21 determines the amount of charge of the battery 22 in 10 steps as described above, and performs charge / discharge control as described above. Even if the amount of charge increases or decreases, charge / discharge control is maintained in the same step.

  In the first operation mode and the second operation mode, charge / discharge control is performed as described above, but in any operation mode, the battery 22 continues to be discharged when the commercial power supply 11 is interrupted. For this reason, when the commercial power supply 11 is restored and power is supplied from the commercial power supply 11, if it is detected that the SOC of the battery 22 is equal to or less than a predetermined value, the charge / discharge control circuit 21 The battery 22 is quickly charged, and when the SOC satisfies a predetermined value, normal charging is performed.

  In addition, rapid charging is performed when the commercial power supply 11 is restored from a power failure, and switching to normal charging is performed when the SOC falls within a predetermined range. The range used as a criterion for the determination is whether or not rapid charging is performed when the power supply is restored from the power failure. This is higher than the SOC range that is the criterion for the determination. That is, the SOC range that is a criterion for determining whether to switch from quick charge to normal charge is higher than the SOC range that is a criterion for determining whether to switch from normal charge to rapid charge. That is, the charge / discharge control circuit 21 performs charge switching control with hysteresis characteristics by switching from normal charging to rapid charging and switching from rapid charging to normal charging.

  In the elevator control device 5 according to the above embodiment, the charge / discharge control circuit 21 detects the charge amount of the battery 22 in a stepped manner, and performs charge / discharge control according to the current charge amount step and the target charge amount Ct. Therefore, the target charge amount Ct can be controlled with a width, that is, a margin. For this reason, even when there is a difference between the detected value of the charge amount and the actual charge amount due to an error of the device that detects the charge amount of the battery 22, the difference can be absorbed. In addition, since the SOC of the battery 22 may change due to a change in ambient temperature, the detected value of the SOC, that is, the detected value of the amount of charge of the battery 22 changes due to such an environmental change. Even in the case where a difference occurs between the amounts, the difference can be absorbed by detecting the charge amount in a stepped manner. As a result, the charge amount of the battery 22 can be detected appropriately.

  In addition, by detecting the charge amount of the battery 22 in a step-like manner in this way, when the charge amount of the battery 22 is reduced, the process proceeds to a step on the side where the charge amount is smaller, which is larger than the actual charge amount. The charge / discharge control is performed when the amount of charge is reduced at an early stage. For this reason, even when the decrease in the charge amount of the battery 22 is accelerated due to the deterioration of the life of the battery 22, the charge / discharge control when the charge amount is reduced can be performed early. As a result, the operation performance of the elevator apparatus 1 when the battery 22 is deteriorated can be ensured.

  Further, by detecting the charge amount of the battery 22 in a stepwise manner, it is possible to control the operation of the elevator apparatus 1 while securing a margin of the charge amount, and therefore, the charge amount of the battery 22 during the operation of the elevator apparatus 1. Even if the number decreases, it is possible to drive to the destination floor. As a result, it is possible to more surely secure the power necessary at the time of the power failure of the commercial power supply 11.

  Further, by performing charge / discharge control by regarding the charge amount of the battery 22 as a preset range, it is possible to reduce the switching frequency when switching the control according to the charge amount. As a result, the charge / discharge control can be simplified.

  In the second operation mode, charge / discharge control is performed so that the charge amount of the battery 22 falls within the step including the target charge amount Ct. Therefore, the charge amount of the battery 22 is continuously changed according to time. The switching frequency of the charge / discharge control can be reduced while making the magnitude close to the changing target charge amount Ct. As a result, it is possible to simplify the charge / discharge control while setting the charge amount of the battery 22 to a desired charge amount that changes according to the time.

  In addition, by providing hysteresis characteristics between switching from normal charging to rapid charging and switching from rapid charging to normal charging, switching between rapid charging and normal charging frequently occurs when power outages occur frequently. You can avoid that. As a result, the charge / discharge control can be simplified more reliably.

[Modification]
In the elevator control device 5 described above, the charge amount of the battery 22 is divided and set in 10 steps from step (1) to step (10), and charge / discharge control is performed. Steps may be other than 10 steps. When emphasizing the simplicity of charge / discharge control, the frequency of control switching can be reduced by reducing the number of steps, and when emphasizing the precision of charge / discharge control, the number of steps is reduced. By increasing the amount, a margin can be given to the amount of charge. Further, the intervals between the steps may be non-uniform. The charge amount step can be more reliably performed according to the degree of request by setting the number as required or setting the interval as necessary with respect to the request during charge / discharge control. be able to.

  In addition, the SOC range in which the quick charge is determined to be performed is not constant but may be variable. In this case, you may make it variable by the remote operation from the position away from the elevator apparatus 1. FIG. As a result, the importance of bringing the charge amount of the battery 22 close to the target charge amount Ct is appropriately changed according to the operation state of the elevator apparatus 1, that is, the SOC discharge frequency, the power supply state of the commercial power supply 11, and the like. Can be made.

  In the elevator control device 5 described above, the battery 22 is directly connected to the elevator driving power source (circuit 29). Instead, the battery 22 is connected to the circuit via the charge / discharge control circuit 21 of the battery unit 20. 29 may be connected.

  Moreover, the elevator control apparatus 5 may combine suitably the structure, control, etc. which are used by embodiment mentioned above and the modification, or may use other than the structure and control mentioned above. Regardless of the configuration or control of the elevator control device 5, the charge amount of the battery 22 is appropriately determined by dividing the charge amount of the battery 22 with respect to the charge capacity of the battery 22 into a plurality of ranges and detecting the charge amount stepwise. Can be detected.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Elevator apparatus 5 Elevator control apparatus 11 Commercial power supply 14 Inverter apparatus 15 Hoisting machine 16 Motor 17 Rope 18 Riding car 19 Counterweight 20 Battery unit 21 Charging / discharging control circuit 22 Battery 30 Control unit 31 Control power supply

Claims (3)

A battery connected to the control power supply of the elevator via a common circuit with the commercial power supply;
A control circuit for detecting a charge state of the battery and controlling charge / discharge of the battery;
With
The control circuit detects the charge amount stepwise by dividing the charge amount of the battery with respect to the charge capacity of the battery into a plurality of ranges ,
The control circuit performs charge / discharge control of the battery so that the charge amount of the battery is within a step including the target charge amount of the battery;
The said control circuit performs control which changes the said step including the said target charge amount according to the time of one day, The elevator control apparatus characterized by the above-mentioned . The control circuit performs rapid charging to the battery when the charge amount of the battery is equal to or less than a predetermined range when the commercial power source is changed from the unusable state to the usable state. The normal range is switched to the normal charge and the other predetermined range, which is a criterion for determining whether to switch from the quick charge to the normal charge, is whether to switch from the normal charge to the quick charge. The elevator control device according to claim 1, wherein the elevator control device is higher than the predetermined range as a reference for determination. The elevator control apparatus according to claim 2 , wherein the predetermined range that is a reference for determining whether to switch from the normal charging to the rapid charging can be changed.

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