JP2013184773A - Contactless power supply system of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contribute power saving by suppressing power consumption during power peak time without obstructing operation of an elevator.SOLUTION: A contactless power supply system of an elevator which contactlessly feeds power from a power supply device provided at a hoistway side to a battery 32 mounted to a counter weight or an elevator car includes: a power consumption calculating unit 31a which calculates an average value of power consumption during power peak time provided to a control device 31 in advance; and a power supply control unit 31c which increases a threshold for determining power supply during predetermined time before the power peak time based on the average value of the power consumption and performs control to feed power when the remaining amount of the battery 32 is equal to or lower than the threshold.

Description

  Embodiments of the present invention relate to an elevator non-contact power supply system that supplies electric power necessary for operation of an elevator in a non-contact manner.

  In recent years, interest in non-contact power supply technology has increased, and it has come to be used in various fields. The non-contact power supply technology mainly uses the principle of electromagnetic induction, and transmits electric power in a non-contact manner by generating an electromotive force by applying an alternating magnetic flux generated in the primary coil to the secondary coil. Technology.

  As a system using this non-contact power supply technology, a rail type (moving type) system in which a power receiving unit moves along a power supply line, and a charge type in which a primary side and a secondary side of a transformer are placed in a fixed position across a gap ( There is a fixed system.

  In elevators, either method can be used. However, since the rail type system has a demerit that the power feeding system becomes larger in proportion to the length of the rail when the lifting process becomes long, the charge type system is considered to be effective.

  Conventionally, as an elevator using a charge type system, a power receiving device is installed on a counterweight (suspending weight), and power is supplied in a non-contact manner from a power feeding device installed at a predetermined location in a hoistway during power feeding. There is.

JP 2001-163533 A

  In recent years, a shortage of power supply has become a serious problem as power demand increases year by year. In particular, since power usage is concentrated in the time zone from noon to evening, it is required to reduce the amount of power used in that time zone. However, in the above-described non-contact power supply system, it is difficult to save power in accordance with the power peak time period because the battery charging time depends on the use state of the elevator.

  The problem to be solved by the present invention is to provide a contactless power feeding system for an elevator that can contribute to power saving by suppressing power consumption during peak power hours without hindering the operation of the elevator. That is.

  The contactless power feeding system for an elevator according to the present embodiment is given in advance in a contactless power feeding system for an elevator that feeds power in a contactless manner from a power supply device installed on a hoistway side to a battery mounted on a counterweight or a car. Based on the average value of the power consumption calculated by the power consumption calculating means, the power consumption calculating means for calculating the average value of the power consumption in the power peak time zone, and before the power peak time zone. A power supply control unit configured to raise a threshold for power supply determination in a predetermined time zone from other time zones, and to control power supply when the remaining amount of the battery is equal to or less than the threshold value.

FIG. 1 is a diagram illustrating a configuration of a contactless power feeding system for an elevator according to a first embodiment. FIG. 2 is a diagram showing the configuration of each device provided in the counterweight in the first embodiment. FIG. 3 is a diagram showing the transition of the daily power usage on the maximum power generation date. FIG. 4 is a diagram showing the relationship between the remaining battery level during elevator operation and the threshold for power supply determination in the conventional method. FIG. 5 is a diagram showing the relationship between the remaining battery level during elevator operation and the threshold for power supply determination in this method. FIG. 6 is a flowchart showing a processing operation relating to battery power supply control in the first embodiment. FIG. 7 is a diagram showing the configuration of each device provided in the counterweight in the second embodiment. FIG. 8 is a diagram showing the relationship between the remaining battery level and the power supply amount during elevator operation in the conventional system. FIG. 9 is a diagram showing the relationship between the remaining battery level and the power supply amount during elevator operation in this system. FIG. 10 is a flowchart showing a processing operation relating to battery power supply control in the second embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration of a contactless power feeding system for an elevator according to a first embodiment. Here, a configuration of a counterweight drive type elevator is illustrated.

  An elevator car 11 and a counterweight (suspending weight) 12 are provided in the hoistway 10 and are supported by guide rails (not shown) so as to be able to move up and down. The car 11 has a sheave 13 on the car, and a rope 14 having one end fixed to the top of the hoistway is installed on the sheave 13. The rope 14 is installed on a traction sheave 16 provided on the counterweight 12 via a sheave 15 provided on the top of the hoistway, and the other end is fixed to the top of the hoistway. As a result, the car 11 and the counterweight 12 are supported in a 2: 1 low pink format.

  Here, in the counterweight drive type elevator, a motor (winding machine) 17 is installed on the counterweight 12. When the traction sheave 16 is rotated by driving the motor 17, the car 11 and the counterweight 12 are lifted and lowered in the hoistway through the rope 14 wound around the traction sheave 16.

  The hoistway 10 is provided with a power feeding device 22 for supplying power from a building power source (commercial power source) 21 to the elevator side. The power feeding device 22 is provided at a specific position of the hoistway 10, specifically at a position facing the counterweight 12 when the car 11 stops on the reference floor. When the car 11 arrives at the reference floor, the power feeding device 22 feeds power to the counterweight 12 in a non-contact manner.

  The counter weight 12 is provided with a control device 31, a battery 32, and a power receiving device 33.

  The control device 21 includes a function for realizing a non-contact power feeding system in addition to the drive control of the counterweight 12. The functional configuration of the control device 21 will be described later with reference to FIG.

  The battery 32 has a predetermined capacity and stores electric power necessary for driving the counterweight 12. The power receiving device 33 faces the power supply device 22 installed in the hoistway 10 when the car 11 stops on the reference floor, receives power supplied from the power supply device 22, and stores it in the battery 32.

  For example, an electromagnetic induction method is used as a non-contact power supply method. The “electromagnetic induction method” is a method of transmitting power to the other coil (power receiving side coil) through the magnetic flux generated when a current is passed through one of the two adjacent coils (power feeding side coil). In addition to this, there are a "radio wave system" that converts current into electromagnetic waves and transmits power through an antenna, and an "electromagnetic field resonance system" that uses the resonance phenomenon of electromagnetic fields. It is not limited.

  FIG. 2 is a diagram showing the configuration of each device provided in the counterweight 12 in the first embodiment.

  The control device 31 provided in the counterweight 12 includes a power consumption calculation unit 31a, an offset setting unit 31b, and a power supply control unit 31c as functions for realizing the present system.

  The power consumption calculation unit 31a calculates an average value α of power consumption in a power peak time zone given in advance. The offset setting unit 31b sets the start time of the power peak time zone as the offset end time T2, and determines the time obtained by back-calculating at least the time width of the power peak time zone from the offset end time as the offset start time T1.

  Based on the average value α of the power consumption calculated by the power consumption calculation unit 31a, the power supply control unit 31c sets the threshold for determining power supply in a predetermined time zone before the power peak time zone from other time zones. Control is performed so that power is supplied when the remaining amount of the battery 32 falls below a threshold value. Specifically, the threshold for power supply determination is raised by the average value α of power consumption during the period from the offset start time T1 set by the offset setting unit 31b to the offset end time T2.

  The battery 32 has a large capacity in order to store electric power necessary for driving the counterweight 12. For example, a supercapacitor (electric double layer capacitor) is used as the battery 32. The battery 32 has a capability of quickly storing high-voltage energy, so that it can cope with rapid power supply.

  The power receiving device 33 includes a power receiving coil 34, a rectifying circuit 35, a smoothing circuit 36, and a switch 37. The power receiving device 33 receives non-contact power fed from the power feeding device 22 installed in the hoistway 10 and receives the battery via the switch 37. 32 is configured to be stored.

  In such a configuration, in this system, when the remaining amount of the battery 32 becomes equal to or less than the threshold value, power is supplied by the following method.

  That is, first, power supply to the counterweight 12 (power supply necessary for driving the motor 17 of the hoisting machine) is performed by moving the car 11 to the reference floor and stopping the counterweight 12 at a position facing the power supply device 22. To do.

  During power feeding, a harmonic current flowing from a power transmission coil (not shown) in the power feeding device 22 installed in the hoistway 10 is received by the power receiving coil 34 in the power receiving device 10. Then, after rectification and smoothing by the rectifying circuit 35 and the smoothing circuit 36, the driving power is stored in the battery 32 via the switch 37. The switch 37 is turned ON / OFF by the control device 31 and stores power in the battery 32 when ON. The electric power stored in the battery 32 is boosted in the control device 31 and supplied to the motor 17 through an inverter (not shown).

  Next, the operation of this system will be described.

  FIG. 3 is a diagram showing the transition of the daily power usage on the maximum power generation date. The horizontal axis represents time and the vertical axis represents power used. The power used is nationwide, and the unit of scale is 1 million kW.

  As can be seen from this figure, the power peak is the time zone from 13:00 to 17:00 in the day. In the present embodiment, in order to suppress the power consumption amount in the power peak time zone, the power supply determination threshold is adjusted so that power supply is performed at different timings.

This will be specifically described with reference to FIGS. 4 and 5.
4 and 5 are diagrams showing the relationship between the remaining battery level during elevator operation and the threshold for power supply determination. FIG. 4 shows the conventional method, and FIG. 5 shows the present method. The horizontal axis represents the time of the day, and the vertical axis represents the power value.

  When the remaining amount of the battery 32 is reduced to a preset threshold value X during the elevator operation, it is determined that power feeding (charging of the battery 32) is necessary. As a result, the car 11 is moved to the reference floor, and the counterweight 12 is stopped at a position facing the power feeding device 22 to perform power feeding.

  Here, as shown in FIG. 4, in the conventional method, the threshold for power supply determination is always constant at X regardless of the time period of one day. Therefore, when the remaining amount of the battery 32 decreases to the threshold value X during the elevator operation, the time at that time is included in the power peak time zone (13:00 to 17:00) in the day described with reference to FIG. Even in this case, power supply is started.

  On the other hand, in this method, as shown in FIG. 5, the threshold value X in the time period T1 to T2 before the power peak time period (13:00 to 17:00) is increased by α than the other time periods. ing. That is, the threshold value of the time period from time T1 to T2 is set to “X + α”. Therefore, when the remaining amount of the battery 32 gradually decreases during the elevator operation, the power supply to the battery 32 can be completed early so that the power supply timing does not reach the power peak time zone.

  The power supply to the battery 32 based on the threshold value is performed by controlling ON / OFF of the switch 37 provided in the power receiving device 33.

  FIG. 6 is a flowchart showing a processing operation related to power supply control of the battery 32 in the first embodiment. Note that the processing shown in this flowchart is executed by the control device 31 which is a computer.

  First, the average value α of the power consumption of the elevator in the power peak time zone given in advance is calculated by the power consumption calculation unit 31a of the control device 31 (step S11). The electric power consumption of the elevator can be easily calculated from the load of the motor 17 during the elevator operation, that is, the torque amount, and the value of α is obtained by averaging the torque amount in the power peak time period.

  Subsequently, the offset start time T1 and the offset end time T2 are set by the offset setting unit 31b of the control device 31 (step S12). Specifically, the start time of the power peak time zone is set as the offset end time T2, and the time obtained by back-calculating at least the time width of the power peak time zone from the offset end time T2 is determined as the offset start time T1.

  For example, as shown in FIG. 5, when the power peak time zone is from 13:00 to 17:00, the offset end time T2 is 13:00, and the start time T1 is 8 hours before at least 4 hours from 13:00. Will be set sometimes.

  When the offset start time T1 and the offset end time T2 are set, the power supply control unit 31c of the control device 31 changes the threshold for power supply determination only during the time period T1 to T2 based on the average value α of the power consumption. The power supply control is performed after the time period is exceeded.

  That is, assuming that the current time is t, if T1 <t <T2 (Yes in step S13), the power supply control unit 31c of the control device 31 sets the threshold for power supply determination to “X + α” and the remaining battery 32 The amount is monitored, and power is supplied when the remaining amount of the battery 32 reaches “X + α” (step S14).

  On the other hand, if the current time t is other than the time period T1 to T2 (No in step S13), the power supply control unit 31c of the control device 31 sets the threshold for power supply determination to a preset X and sets the battery 32 The remaining amount is monitored, and power is supplied when the remaining amount of the battery 32 reaches X (step S15).

  As described above, according to the first embodiment, the power peak is determined when the remaining battery level is reduced by increasing the threshold for power supply determination only for a predetermined period before the power peak time period. Power can be supplied in advance before entering the time zone. Thereby, it can contribute to power saving by suppressing power consumption in the power peak time zone without causing trouble in the operation of the elevator.

  In the first embodiment, the threshold value in the time period from T1 to T2 is increased by α from X. However, the threshold value may be set to a value higher than α. However, if the threshold value is increased too much, power supply is frequently required in the time period T1 to T2, and the operation efficiency is lowered. It is preferable.

(Second Embodiment)
Next, a second embodiment will be described.

  In the first embodiment, power is supplied in advance by increasing the threshold value before the power peak time period. However, if for some reason the traffic demand increases during the peak power hours, the remaining battery capacity may decrease rapidly and the need for power supply may arise. Therefore, in the second embodiment, when the necessity of power supply comes out in the power peak time zone, the power supply amount to the battery 32 at that time is adjusted to suppress the power consumption in the power peak time zone. It is.

  FIG. 7 is a diagram showing the configuration of each device provided in the counterweight 12 in the second embodiment. In addition, the same code | symbol is attached | subjected to the part same as the structure of FIG. 2 in the said 1st Embodiment, and the description shall be abbreviate | omitted.

  In the second embodiment, the control device 31 includes an adjustment time setting unit 31d. The adjustment time setting unit 31d sets adjustment time zones T3 to T4 for adjusting the power supply amount according to the power peak time zone. The power supply control unit 31c supplies power while keeping the average power consumption α at the adjustment time period T3 to T4, and supplies power according to the remaining amount of the battery 32 in time periods other than the adjustment time period T3 to T4. .

This will be specifically described with reference to FIGS.
8 and 9 are diagrams showing the relationship between the remaining battery level and the amount of power supply during elevator operation. FIG. 8 shows the conventional method, and FIG. 9 shows the present method. The horizontal axis represents the time of the day, and the vertical axis represents the power value.

  When the remaining amount of the battery 32 is reduced to a preset threshold value X during the elevator operation, it is determined that power feeding (charging of the battery 32) is necessary. As a result, the car 11 is moved to the reference floor, and the counterweight 12 is stopped at a position facing the power feeding device 22 to perform power feeding.

  Here, as shown in FIG. 8, in the conventional method, when the remaining amount of the battery 32 falls to the threshold for power supply determination in the power peak time zone (13:00 to 17:00) during the day, Power is supplied to the full capacity (that is, full charge).

  On the other hand, in this method, as shown in FIG. 9, when the remaining amount of the battery 32 falls to the threshold for power supply determination during T3 to T4 in the power peak time period (13:00 to 17:00). The amount of power supply can be suppressed to α. That is, the operation of the elevator is continued by performing the minimum power supply necessary for the time period without performing the full charge.

  The amount of power supplied to the battery 32 is adjusted by controlling ON / OFF of a switch 37 provided in the power receiving device 33.

  FIG. 10 is a flowchart showing a processing operation related to power supply control of the battery 32 in the second embodiment. Note that the processing shown in this flowchart is executed by the control device 31 which is a computer.

  First, the average value α of the power consumption of the elevator in the power peak time zone given in advance is calculated by the power consumption calculation unit 31a of the control device 31 (step S21).

  Subsequently, a start time T3 and an end time T4 for adjusting the power supply amount are set by the adjustment time setting unit 31d of the control device 31 (step S22). The start time T3 and end time T4 are set according to the power peak time zone.

  For example, as shown in FIG. 9, when the power peak time period is from 13:00 to 17:00, the power supply amount adjustment start time T3 is 13:00 and the end time T4 is set to 17:00. Become.

  When the power supply amount adjustment start time T3 and end time T4 are set, the power supply control unit 31c of the control device 31 supplies power while suppressing the power supply amount to the average value α of the power consumption in the time period T3 to T4. I do.

  That is, assuming that the current time is t, if T3 <t <T4 (Yes in step S23), when the remaining amount of the battery 32 reaches the threshold value X in that time zone, the power supply control unit of the control device 31 31c refrains from full charge and supplies power only for the average value α of the power consumption (step S24).

  On the other hand, if the current time t is other than the time period T3 to T4 (No in step S23), when the remaining amount of the battery 32 reaches the threshold value X during that time period, the power supply control unit 31c of the control device 31 is performed. Performs power supply (full charge) according to the remaining amount of the battery 32 as usual (step S25).

  As described above, according to the second embodiment, by controlling the power supply amount in the power peak time zone, it is possible to suppress power consumption in the time zone and contribute to power saving. Further, in combination with the first embodiment, if the threshold for power supply determination is raised before the power peak time period, the power saving effect can be further improved.

  In the second embodiment, the power supply amount in the time period from T3 to T4 is α, but power may be supplied at a value further lower than α. However, if the power supply amount is suppressed too much, power supply is frequently required in the time period from T3 to T4, and the operation efficiency is lowered. Therefore, power supply is performed using α which is the average power consumption in the power peak time period as a guide. It is preferable.

  Further, in each of the embodiments described above, the system that performs the non-contact power supply to the battery 32 provided in the counterweight 12 as illustrated in FIG. 1 has been described. However, the power supply target is not limited to the counterweight 12, for example, the car 11 There may be. That is, in the configuration in which the car 11 is provided with a driving battery, the present invention can be applied even when power is supplied according to the remaining battery level during the elevator operation, and the same effect as described above can be obtained.

  According to at least one embodiment described above, there is provided a non-contact power feeding system for an elevator that can contribute to power saving by suppressing power consumption during a power peak time without hindering the operation of the elevator. Can be provided.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Hoistway, 11 ... Ride car, 12 ... Counterweight, 13 ... Sheave, 14 ... Rope, 15 ... Sheave, 16 ... Traction sheave, 17 ... Motor, 21 ... Building power supply, 22 ... Power feeding device, 31 ... Control device , 31a ... power consumption calculation unit, 31b ... offset setting unit, 31c ... power feeding control unit, 31d ... adjustment time setting unit, 32 ... battery, 33 ... power receiving device, 34 ... power receiving coil, 35 ... rectifier circuit, 36 ... smoothing Circuit, 37 ... switch.

Claims (5)

In the non-contact power feeding system of an elevator that performs non-contact power feeding from a power feeding device installed on the hoistway side to a battery mounted on a counterweight or a car,
Power consumption calculating means for calculating an average value of power consumption in a power peak time zone given in advance;
Based on the average value of the power consumption calculated by the power consumption calculation means, the threshold for power supply determination in a predetermined time zone before the power peak time zone is raised from other time zones, and the battery A non-contact power feeding system for an elevator, comprising: power feeding control means for performing power feeding when the remaining amount of the power falls below the threshold value. An offset setting means for setting the start time of the power peak time zone as an offset end time, and setting an offset start time as a time obtained by back-calculating at least the time width of the power peak time zone from the offset end time;
The power supply control means includes:
The non-contact of an elevator according to claim 1, wherein the threshold value is increased by an average value of the power consumption from the offset start time set by the offset setting means to the offset end time. Power supply system. The power supply control means includes:
The contactless power supply system for an elevator according to claim 1, wherein the power supply amount in the power peak time zone is controlled based on an average value of the power consumption calculated by the power consumption calculation means. An adjustment time zone setting means for setting an adjustment time zone for adjusting the power supply amount in accordance with the power peak time zone,
The power supply control means includes:
In the adjustment time zone set by the adjustment time zone setting means, power supply is performed while suppressing the average value of the power consumption, and in a time zone other than the adjustment time zone, power is supplied according to the remaining amount of the battery. The elevator non-contact electric power feeding system according to claim 3. The counterweight is equipped with a hoisting machine,
The contactless power feeding system for an elevator according to claim 1, wherein the electric power stored in the battery is used as power for the hoisting machine.

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