JP5335855B2 - Elevator drive system - Google Patents

Description

  The present invention relates to an elevator drive system, and more particularly to an elevator drive system that uses a power storage device such as a storage battery or a capacitor to control charge / discharge of the power storage device to reduce power from a commercial power source.

  In a conventional elevator drive system using a power storage device, for example, as disclosed in Patent Document 1 and Patent Document 2, the target value for the DC voltage on the input side of the inverter is higher than the full-wave rectified voltage of the commercial power supply. The value corresponds to a certain voltage.

  Moreover, in the elevator system disclosed by patent document 3 and patent document 4, operation modes, such as a power running and regeneration of an elevator, are determined from a DC voltage value, and charging / discharging of an electrical storage apparatus is performed.

Japanese Patent No. 4463912 JP 2001-139244 A JP 2001-240326 A Japanese Patent Laid-Open No. 2001-240319

  If the DC voltage input to the inverter that drives the motor is set to a constant value higher than the maximum voltage of the commercial power supply as in Patent Document 1 and Patent Document 2, the power storage device is charged during regeneration, and the power to the inverter is reduced. When an assisting power storage device is used, it is necessary to always use a power storage device having a large capacity in order to achieve peak cut of power and reduction of power consumption even when power running continues.

  Also, as in Patent Document 3 and Patent Document 4, the power storage device is in a discharge mode during power running and in a charge mode during regeneration, regardless of the amount of power storage. In order to reduce the amount of electric power, it is necessary to use a power storage device with a large capacity.

  An object of the present invention is to provide an elevator drive system capable of reducing the capacity of a power storage device for reducing the peak power and power consumption of a commercial power supply.

  In one aspect of the present invention, a converter that rectifies AC power from a commercial power source and converts it to DC power, a capacitor connected to the DC side of the converter, an inverter connected to the DC side of the capacitor, An AC motor for driving an elevator connected to the AC side of the inverter, a charge / discharge device connected in parallel with the capacitor, a power storage device connected to the charge / discharge device, and a storage amount of the power storage device are detected. The storage amount detection means, the operation mode determination means for determining whether the current operation mode of the elevator is powering or regenerative, and the power storage device has a storage amount less than a first threshold value while the elevator is in powering operation, By controlling the charge / discharge device so that the voltage of the capacitor approaches a target voltage set lower than the maximum voltage of the commercial power supply, the power storage If the amount of electricity stored in the power storage device is greater than a second threshold during the regenerative operation of the elevator, the voltage of the capacitor is set higher than the maximum voltage of the commercial power supply. The charging / discharging device is controlled so as to be closer to, so that the power storage device is charged with regenerative power, and a control device that suppresses the supply of power from the commercial power supply is provided.

  Here, it is desirable that the first threshold value during the power running operation is larger than the second threshold value during the regenerative operation.

  In addition, if the amount of power stored in the power storage device is greater than the first threshold value while the elevator is in power running, the charge of the capacitor approaches the target voltage set higher than the maximum voltage of the commercial power supply. By controlling the discharge device, it is desirable to promote discharge from the power storage device as powering power and suppress the supply of power from the commercial power source.

  Further, if the amount of power stored in the power storage device is smaller than the second threshold value during regenerative operation of the elevator, the charging voltage is set so that the voltage of the capacitor approaches a target voltage set lower than the maximum voltage of the commercial power supply. It is desirable to promote charging of the power storage device by controlling the discharge device.

  In addition, when the current operation mode of the elevator is acquired and the charge amount of the power storage device is small according to the charge amount of the power storage device and the current operation mode, the target voltage value of the capacitor is set lower than the maximum voltage of the commercial power supply. The charging control of the power storage device is promoted.

  In addition, the next operation mode after the elevator stops is determined based on the call registration information set from the elevator call button and destination floor button, and information on waiting sensors such as cameras, infrared sensors, ultrasonic sensors, and security gates. The energy saving effect is enhanced by determining the target voltage value of the capacitor and changing the threshold value of the charge amount by means of prediction.

  In addition, a display device indicating the operation mode, charging / discharging operation, the amount of stored electricity, etc. is installed in the elevator car or the landing to display the energy saving effect.

  According to a preferred embodiment of the present invention, it is possible to realize an elevator drive system that can reduce the capacity of a power storage device for reducing peak power consumption and power consumption from a commercial power source.

  Other objects and features of the present invention will be clarified in the following description of embodiments.

The schematic block diagram of the elevator drive system by Example 1 of this invention. Explanatory drawing of the electrical storage amount and charging / discharging control by Example 1 of this invention. The schematic block diagram of the elevator drive system by Example 2 of this invention. Explanatory drawing of the electrical storage amount and charging / discharging control by Example 2 of this invention. The schematic block diagram of the elevator drive system by Example 3 of this invention. Explanatory drawing of the electrical storage amount and charging / discharging control by Example 3 of this invention. The schematic block diagram of the elevator drive system by Example 4 of this invention. The schematic block diagram of the elevator drive system by Example 5 of this invention. The schematic block diagram of the elevator drive system by Example 6 of this invention.

  Hereinafter, specific embodiments according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of an elevator drive system according to a first embodiment of the present invention. In the elevator drive system according to the first embodiment of the present invention, as a main circuit, first, a converter 101 that rectifies AC power from the commercial power supply 100 and converts it into DC power, and an inverter 103 connected to the DC side of the converter 101. And a drive motor 104 to which power is supplied from the inverter 103. A capacitor 102 is connected to a DC stage between the converter 101 and the inverter 103.

  The drive motor 104 drives the elevator car 105 and the counterweight 106, which are suspended in a vine shape, to move up and down.

  A charging / discharging device 108 is connected between both terminals of the capacitor 102, and power is transferred between the capacitor 102 and the power storage device 107. This charging / discharging device 108 is configured by connecting a series circuit of two IGBTs 109 and 110 connected in parallel to the capacitor 102, and a series circuit of a reactor and a power storage device 107 between the series connection point and the DC negative terminal. Has been. Then, the upper IGBT 109 can be controlled to control charging from the capacitor 102 to the power storage device 107, and the lower IGBT 110 can be controlled to control discharge from the power storage device 107 to the capacitor 102.

  On the other hand, as a control circuit, a voltage controller (AVR) 111 is provided in the charging / discharging device 108 and controls the voltage Vdc of the capacitor 102 to approach the given target voltage value Vref. A target capacitor voltage setting unit 112 that sets the target voltage and a storage amount detection unit 113 that detects a storage amount Qb of the power storage device 107 are provided.

  FIG. 2 is an explanatory diagram of the charged amount and charge / discharge control according to the first embodiment of the present invention. The target capacitor voltage setting unit 112 sets a target capacitor voltage command value Vref as shown in FIG. 2 in accordance with the storage amount Qb acquired from the storage amount detection unit 113. The relationship between the maximum voltage Vsp and Vref of the commercial power supply 100 is as follows.

(1) Mode 152:
In the storage amount range Qtmax> Qb ≧ Qt1, the target capacitor voltage Vref is set to Vref> Vsp in order to transfer power only between the power storage device 107 and the inverter 103 and promote discharge.

(2) Mode 153:
In the charged amount range Qtmin <Qb <Qt1, the target capacitor voltage Vref is set to Vref <Vsp in order to supply power from the commercial power supply 100 to the power storage device 107 and the inverter 103 to promote charging.

(3) Mode 154:
In the region where the storage amount Qb is Qb ≧ Qtmax, the IGBT 109 on the upper side of the charge / discharge device 108 is fixed to OFF so that the storage device 107 does not have an excessive storage amount, and charging is stopped. At the same time, it is desirable to promote discharge by increasing the target capacitor voltage Vref.

(4) Mode 155:
In the region where the charged amount Qb is Qb ≦ Qtmin, an excessive current flows through the charging / discharging device 108, so that the lower IGBT 110 is fixed to OFF, the discharge is stopped, and the target capacitor is stopped. The voltage Vref is lowered to promote charging.

  As described above, the target capacitor voltage setting unit 112 appropriately charges and discharges the battery by setting the target voltage command value Vref of the capacitor 102 for the voltage controller (AVR) 111 of the charging / discharging device 108 according to the charged amount. Therefore, the capacity of the charging / discharging device 108 can be reduced.

  In FIG. 1, since the power storage device is a capacitor, the amount of power storage can be obtained from the voltage, but in the case of a battery, it may be obtained from the controller of the battery.

  When the difference between the maximum voltage Vsp of the commercial power supply 100 and the voltage Vdc of the capacitor 102 increases, an excessive current flows through the converter 101. In order to prevent this, the current limiting means 119 is installed, but the position where the current limiting means 119 is installed may be on the commercial power supply side or the DC side of the converter 101, or may be built in the converter 101.

  In addition, the current limiting means 119 of FIG. 1 assumes a reactor. When Vref is set within a range in which the difference between the maximum voltage of the commercial power supply and the voltage Vdc of the capacitor 102 does not increase, the current limiting means 119 is not installed, and only the impedance of the wiring is sufficient.

  The switch 120 is a protection unit that turns on when the voltage Vdc of the capacitor 102 exceeds a limit value and prevents overvoltage by the discharge resistor 121.

  In FIG. 3, the schematic block diagram of the elevator drive system by Example 2 of this invention is shown. The elevator driving system according to the second embodiment is different from the first embodiment shown in FIG. 1 in that the elevator driving system includes an operation state acquisition unit 114 that acquires the current operation state of the elevator, and the acquired operation state is reflected in the target capacitor voltage setting unit 112. It is to let you. As a method of acquiring the current operation state of the elevator, the load amount in the car 105 and the vertical movement of the car are detected.

  FIG. 4 is an explanatory diagram of the charged amount and charge / discharge control according to the second embodiment of the present invention. As shown in FIG. 4, the target capacitor voltage setting unit 112 has a capacitor amount Qb acquired from the storage amount detection unit 113 and a current powering / regeneration mode of the elevator acquired from the operation state acquisition unit 114 as shown in FIG. A target value Vref of the voltage Vdc is set.

(1) Mode 252:
In the power storage amount range Qtmax> Qb ≧ Qt1 during power running, the value of Vref is set to Vref> Vsp in order to supply power from only the power storage device 107 to the inverter 103 and promote discharge.

(2) Mode 253:
In the power storage amount range Qtmin1 ≦ Qb <Qt1 during power running, power is supplied from the commercial power supply 100 to the inverter 103 and the power storage device 107 to promote charging, so the value of Vref is set to Vref <Vsp.

(3) Mode 256:
In the storage amount range Qtmax> Qb ≧ Qt2 at the time of regeneration, the target capacitor voltage Vref is set to Vref> Vsp in order to promote charging by the regenerative power from the inverter 103. That is, by keeping capacitor voltage Vdc high, the inflow of power from power supply 100 can be stopped, and regenerative power that attempts to exceed target voltage Vref can be charged to power storage device 107.

(4) Mode 257:
In the storage amount range Qtmin2 ≦ Qb <Qt2 at the time of regeneration, Vref is set to Vref <Vsp in order to supply electric power from the commercial power supply 100 to the inverter 103 and the power storage device 107 to promote charging.

  That is, by keeping capacitor voltage Vdc low, the inflow of power from power supply 100 and inverter 103 is promoted, and regenerative power and power from the power supply that try to exceed low target voltage Vref are charged to power storage device 107. Can do.

(5) Mode 255:
In the region where the charged amount Qb is Qb> Qtmax, charging is stopped by fixing the IGBT 109 on the upper side of the charging / discharging device 108 to OFF so that the charged amount of the charged power device 107 does not become excessive. At the same time, it is desirable to promote the discharge from the power storage device by increasing the target capacitor voltage Vref.

(6) Modes 254, 258:
In the region where the charged amount Qb during power running is Qb <Qtmin1 and in the region where the charged amount Qb during regeneration is Qb <Qtmin2, an excessive current flows through the charge / discharge device 108 when attempting to increase the capacitor voltage. The lower IGBT 110 is fixed in the OFF state to stop discharging, and the target voltage command value Vref is lowered to forcibly promote charging.

  As described above, the target capacitor voltage setting unit 112 sets the target voltage Vref of the capacitor 102 according to the amount of power stored in the power storage device and the current operation mode of the elevator.

  In the second embodiment, since the power storage device 107 can be charged during regeneration, the power consumption from the commercial power supply 100 is further suppressed by setting the power storage threshold Qt2 to be smaller than the power storage threshold Qt1 during powering. This can further improve the energy saving effect.

  In FIG. 5, the schematic block diagram of the elevator drive system by Example 3 of this invention is shown. The elevator driving system according to the third embodiment is different from the second embodiment shown in FIG. 3 in that the operation prediction means 115 for predicting the next operation mode of the elevator based on direction information such as call information and destination floor information and elevator loading information. And the obtained operation mode is reflected on the target capacitor voltage setting means 112.

  Similar to the second embodiment, the target capacitor voltage setting unit 112 includes the storage amount Qb acquired from the storage amount detection unit 113 and the current operation mode such as power running / regeneration of the elevator acquired from the operation state acquisition unit 114. In accordance with the next operation mode predicted by the operation predicting means 115, as shown in FIG. 6, the target value Vref of the capacitor voltage Vdc is set according to the charged amount Qb.

  FIG. 6 is an explanatory diagram of the charged amount and charge / discharge control according to the third embodiment of the present invention. Also in the third embodiment, the modes 252 to 258 during power running and regeneration operate in exactly the same manner as the modes (1) to (6) of the second embodiment.

  Next, control when the elevator is stopped will be described.

(7) Mode 259:
In the charge amount range Qtmax> Qb ≧ Qt3 at the time of stopping, the upper IGBT 109 is fixed to OFF and charging is stopped.

(8) Mode 260:
In the charge amount range Qtmin2 ≦ Qb <Qt3 at the time of stoppage, it is desirable that the power storage device 107 is charged from the commercial power supply 100 in preparation for the next operation because the power storage device 107 has little stored power. Therefore, the target capacitor voltage Vref is set to Vref <Vsp.

  That is, by keeping the capacitor voltage Vdc low, the inflow of power from the power source 100 to the capacitor 102 is promoted, and the inflow power from the power source 100 that attempts to exceed the low target voltage Vref is directed to the charging of the power storage device 107. Can.

  Here, when the next operation is predicted to be regenerated by the operation prediction unit 115 while the elevator is stopped, the target capacitor voltage setting unit 112 lowers the threshold value Qt3 and expands the charge stop region of the mode 259, The area | region which supplies electric power from the commercial power supply 100 in the mode 260 is suppressed. Specific examples are shown below.

  (A) As a premise, the building is 10 stories high and the weight 106 is a weight that balances the total weight of the car with a 50% loading capacity. Now, the elevator is closed on the 5th floor, and of course there are no passengers.

  (B) Here, it is assumed that at the 5th floor platform, the user presses the hall button in the downward direction to open the door and starts boarding.

  (C) When waiting passengers continue to board and exceed half of the maximum loading capacity, the driving prediction means 115 can predict the next driving as regeneration. In response to this, the target capacitor voltage setting means 112 lowers the value of the threshold value Qt3 in FIG. Therefore, the range of the (7) mode 259 is expanded, and the charging area 260 from the power source of the (260) mode 260 is narrowed. As a result, the upper IGBT 109 is fixed to OFF in the middle, and charging from the commercial power supply 100 is stopped.

  In this way, the target capacitor voltage setting unit 112 adjusts the threshold value Qt3 according to the current operation mode and the next operation mode. If the next operation mode is regeneration, it is clear that the amount of charge to the power storage device 107 will increase in the near future. Therefore, charging is stopped when the power storage amount Qb is low. Thus, by stopping charging from the commercial power source 100 early, the power consumption from the commercial power source 100 can be further reduced.

  In FIG. 7, the schematic block diagram of the elevator drive system by Example 4 of this invention is shown. The elevator drive system according to the fourth embodiment is different from the third embodiment shown in FIG. 5 in that the elevator driving system includes waiting detection means 116 such as a camera, an infrared sensor, an ultrasonic sensor, a security gate, or a piezoelectric mat. The detection result is reflected on the driving prediction means 115.

  The target capacitor voltage setting unit 112 acquired from the operation prediction unit 115 in addition to the storage amount Qb acquired from the storage amount detection unit 113 and the current powering / regeneration operation mode of the elevator acquired from the operation state acquisition unit 114. Based on the prediction of the next operation state after the elevator stops, the target value of the voltage of the capacitor is adjusted in accordance with the charged amount Qb shown in FIG.

  That is, modes 252 to 258 during power running, regeneration, and stop operate in the same manner as modes 252 to 258 in the second and third embodiments shown in FIGS. 4 and 6.

  When the operation prediction unit 115 determines that the next operation is regeneration based on the detection result of the waiting detection unit 116 during the regeneration of the elevator, the target capacitor voltage setting unit 112 lowers the threshold value Qt2 in FIG. The supply of power from the commercial power supply 100 is suppressed. Specific examples are shown below.

  (A) The building is 10 stories high. The elevator is fully descending toward the first floor (during regeneration). The weight 106 is the weight of the total weight of the car with 50% loading capacity, as described above.

  (B) The downward direction hall call button is pressed on the 10th floor of the building, and is not pressed on the other floors. On the first floor, there is no waiting area in the elevator hall, and it can be determined by the waiting area detecting means 116 that there is no possibility that the waiting area will get on.

  (C) The operation prediction means 115 predicts the next operation as regeneration. The target capacitor voltage setting unit 112 lowers the value of the threshold value Qt2 in FIG. For this reason, even in the case of (4) above, the state of (3) above is entered, and charging from the commercial power supply 100 is stopped.

  Also, when the elevator is in power running and the operation prediction means 115 determines that the next operation is regeneration by the human detection means 116, the capacitor voltage setting means 112 lowers the threshold value Qt1 in FIG. The supply of electric power from is suppressed. Specific examples are shown below.

  (A) As in the previous example, the building is 10 stories high, the weight 106 is the weight that balances the total weight of the 50% load car, and the elevator is descending toward the first floor. Since there is only one passenger inside, it is assumed that power running is in progress.

  (B) Assuming that the call button is pressed on the 10th floor of the building and not on the other floors, there is no waiting in front of the elevator at the landing on the 1st floor, and there is a possibility that the waiting detection means 116 will get a person on board. It can be judged that there is no.

  (C) The operation prediction means 115 predicts the next operation as regeneration. The target capacitor voltage setting means 112 lowers the value of the threshold value Qt1 in FIG. For this reason, even in a region where charging and driving from the power source of (2) mode 253 are normally employed, in this situation, the state of (1) mode 252 is entered and charging from the commercial power source 100 is stopped. To do.

  In this manner, the target capacitor voltage setting unit 112 adjusts the threshold value Qt1 and the threshold value Qt2 based on prediction of the current operation mode and the next operation mode after the elevator stops, and can be charged from the commercial power supply 100. Power consumption can be reduced because it is suppressed as much as possible.

  Since the waiting detection means 116 is provided and the number of users who get on the elevator can be accurately predicted, it is possible to increase the prediction accuracy of the next operation mode of the elevator and to further reduce the power consumption.

  FIG. 8 is a schematic configuration diagram of an elevator drive system according to a fifth embodiment of the present invention. The elevator drive system according to the fifth embodiment is different from the first embodiment shown in FIG. 1 in that it includes a maximum travel distance acquisition unit 117 that acquires the maximum travel distance of the elevator from the stop floor information.

  For example, when the upper half of the building in which the elevator is installed is a rest floor, the maximum travel distance acquisition unit 117 determines that the travel distance is short. When the maximum travel distance is short, the amount of power flowing out from the power storage device 107 in one powering operation is reduced. For this reason, the storage amount to be secured may be small, and the target capacitor voltage setting means 112 reduces the threshold value Qt1 shown in FIG. Suppress.

  In this way, the target capacitor voltage setting unit 112 can reduce the charging from the commercial power supply 100 to the power storage device 107 by adjusting the threshold value Qt1 according to the charged amount and the maximum travel distance, and the consumption from the commercial power supply 100 can be reduced. Electric power can be further reduced.

  In FIG. 9, the schematic block diagram of the elevator drive system by Example 6 of this invention is shown. The elevator drive system according to the sixth embodiment is different from the second embodiment shown in FIG. 3 in that a display device 118 that displays the operation mode of the elevator, the state of charge / discharge of the charge / discharge device 108, the amount of power stored in the power storage device 107, and the like. It is to have.

  The display device 118 displays power running / regeneration / stop operation modes while the elevator is operating or stopped, whether the power storage device is currently discharging or charging, and the amount of power stored in the power storage device. Is displayed. Thereby, the energy-saving effect to a user can be shown and a manager can be notified of the state of charging / discharging device 108 and power storage device 107.

  In the above-described first to sixth embodiments, hysteresis may be provided to the thresholds Qt1 to Qt3 of the storage amount in order to cope with temporary fluctuations in the storage amount.

  DESCRIPTION OF SYMBOLS 100 ... Commercial power supply, 101 ... Converter, 102 ... Capacitor, 103 ... Inverter, 104 ... Motor, 105 ... Car, 106 ... Weight, 107 ... Power storage device, 108 ... Charge / discharge device, 109 ... IGBT (upper side), 110 ... IGBT (Lower side) 111 ... charge / discharge control, 112 ... capacitor voltage setting means, 113 ... charge amount detection means, 114 ... operating state acquisition means, 115 ... operation prediction means, 116 ... waiting detection means, 117 ... maximum travel distance Obtaining means, 118 ... display device, 119 ... current limiting means, 120 ... switch, 121 ... discharge resistance.

Claims (11)

A converter that rectifies AC power from a commercial power source and converts it into DC power;
A capacitor connected to the DC side of the converter;
An inverter having a DC side connected to the capacitor;
An AC motor for driving an elevator connected to the AC side of the inverter;
A charge / discharge device connected in parallel with the capacitor;
A power storage device connected to the charge / discharge device;
A storage amount detecting means for detecting a storage amount of the power storage device;
Operation mode determination means for determining whether the current operation mode of the elevator is power running or regeneration;
If the amount of power stored in the power storage device is smaller than a first threshold during power running of the elevator, the charge / discharge device is adjusted so that the voltage of the capacitor approaches a target voltage set lower than the maximum voltage of the commercial power supply. By controlling, while promoting the charging to the power storage device,
During the regenerative operation of the elevator, if the amount of power stored in the power storage device is greater than a second threshold, the charge / discharge device is set so that the voltage of the capacitor approaches a target voltage set higher than the maximum voltage of the commercial power supply. An elevator drive system comprising a control device that suppresses supply of electric power from the commercial power supply while charging the power storage device with regenerative electric power by controlling. A converter that rectifies AC power from a commercial power source and converts it into DC power;
A capacitor connected to the DC side of the converter;
An inverter having a DC side connected to the capacitor;
An AC motor for driving an elevator connected to the AC side of the inverter;
A charge / discharge device connected in parallel with the capacitor;
A power storage device connected to the charge / discharge device;
A storage amount detecting means for detecting a storage amount of the power storage device;
Operation mode determination means for determining whether the current operation mode of the elevator is power running or regeneration;
If the amount of power stored in the power storage device is smaller than a first threshold during power running of the elevator, the charge / discharge device is adjusted so that the voltage of the capacitor approaches a target voltage set lower than the maximum voltage of the commercial power supply. By controlling, while promoting the charging to the power storage device,
During the regenerative operation of the elevator, if the amount of power stored in the power storage device is greater than a second threshold value that is smaller than the first threshold value, the voltage of the capacitor is set to a target voltage set higher than the maximum voltage of the commercial power supply. An elevator drive system comprising: a control device that suppresses supply of electric power from the commercial power supply while charging the power storage device with regenerative power by controlling the charging / discharging device so as to approach.   In Claim 1 or 2, if the amount of charge of the power storage device is larger than the first threshold value while the elevator is in power running, the voltage of the capacitor becomes a target voltage set higher than the maximum voltage of the commercial power supply. By controlling the charging / discharging device so as to approach, the elevator driving system is characterized by accelerating discharge as powering power from the power storage device and suppressing power supply from the commercial power source.   In Claim 1 or 2, if the amount of charge of the power storage device is smaller than the second threshold value during regenerative operation of the elevator, the voltage of the capacitor is set to a target voltage set lower than the maximum voltage of the commercial power supply. The elevator drive system characterized by accelerating | stimulating the charge to the said electrical storage apparatus by controlling the said charging / discharging apparatus so that it may approach.   5. The elevator drive system according to claim 1, further comprising current limiting means for suppressing a current from the commercial power source to a DC side of the converter. In any one of Claims 1-5,
When the amount of power stored in the power storage device is larger than a third threshold while the elevator is stopped, the charge / discharge device is controlled to stop charging the power storage device,
When the elevator is stopped, when the amount of power stored in the power storage device is smaller than the third threshold, the charge / discharge is performed so that the voltage of the capacitor approaches a target voltage set lower than the maximum voltage of the commercial power supply. By controlling the device, while promoting the charging from the commercial power supply to the power storage device,
An operation mode prediction means for predicting whether the next operation mode of the elevator is power running or regeneration;
An elevator drive system comprising means for switching the third threshold according to the operation mode predicted by the operation mode prediction means.   7. The elevator drive system according to claim 6, wherein the operation mode prediction means predicts the next operation mode of the elevator from the call registration information and the output of the car weight sensor.   7. The elevator drive according to claim 6, wherein the operation mode prediction means predicts a next operation mode after the elevator stops, including information from a wait detection means for detecting a wait at the elevator landing. system. In any one of Claims 1-5,
Based on the elevator destination floor information and call registration information, an operation mode prediction means for predicting whether the operation mode after the elevator stops is power running or regeneration,
An elevator drive system comprising means for changing at least one of the first and second threshold values based on a current operation mode of the elevator and a predicted next operation mode. In any one of Claims 1-9,
Elevator maximum mileage acquisition means for acquiring the maximum mileage of the service range elevator from the service range information of the elevator,
An elevator drive system comprising means for changing at least one of the threshold values based on an operation mode of the elevator and the length of the maximum travel distance of the elevator.   11. The display device according to claim 1, wherein at least one of the operation mode of the elevator, the charge / discharge operation status of the power storage device, or the power storage amount of the power storage device is installed in the elevator car or the elevator hall. An elevator drive system characterized by that.

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