JP2003299250A - Power supply unit and elevator apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To significantly reduce the power supply facility capacity of a load to be intermittently operated, such as an elevator, with a simple structure, and continue the operation thereof even in case of power failure. <P>SOLUTION: A power supply unit 8 having an energy storage element such as a secondary battery 86 is connected to a power supply 1 fed to the load to be intermittently operated, such as an elevator. Received current is controlled to a small constant value from some fractions of the rated value of the load 2 to about a tenth part continuously regardless of running/stopping of the load 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an elevator,
More particularly, the present invention relates to a power supply device and an elevator device that use an energy storage device to suppress fluctuations in power received from a power supply.

[0002]

2. Description of the Related Art Using an energy storage device such as a battery,
Depending on the size of the load power, charging is performed during the time when the load power is small, and discharging is performed during the time when the load power is large.
There is a device that cuts the peak of received power. For example, JP 2001-95175 A and JP 2001-187 A.
In Japanese Patent No. 676, a power conversion device for driving a motor,
An energy storage device is provided on the DC stage between the converter and the inverter. Also, Japanese Patent Laid-Open No. 2001-3270
In Japanese Patent Publication No. 83, an energy storage device including a converter and a secondary battery is provided in parallel with a target load with respect to an AC power supply.

[0003]

Such a system can cut the peak of the received power. However, compared to the average amount of power required by the load that is operated intermittently, such as when the elevator is running / stopping, the instantaneous power received is still large and the power supply facility capacity must be large. .

An object of the present invention is to provide a power supply device and an elevator device which can greatly reduce the capacity of power supply equipment with a simple structure.

[0005]

According to one aspect of the present invention, a power supply device including an energy storage element such as a battery is connected to a power supply, and even if the load is intermittently operated, the power receiving current on the power supply side is maintained throughout a scheduled time period. Is controlled to be almost constant. On the other hand, the charging / discharging from the energy storage element is controlled so that a current according to the required power of the load of the motor or the like flows on the load side.

As a result, the power supply facility capacity can be greatly reduced with a simple structure.

Other objects and characteristics of the present invention will be clarified in the description of the embodiments below.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an elevator apparatus according to an embodiment of the present invention. In the figure, the AC power from the AC power supply 1 is taken into the power conversion device 2. The power converter 2 controls the output voltage / frequency and controls the speed of the elevator drive motor 3. A sheave 4 is attached to the shaft end of the motor 3, and a rope 5 is wound around the sheave 4. A car 6 and a counterweight 7 are connected to the end of the rope 5.

The power converter 2 includes a rectifier 21 for converting alternating current to direct current, a smoothing capacitor 22 for smoothing the direct current voltage rectified by the rectifier 21, and a variable voltage for the direct current voltage.
An inverter 23 for converting into alternating current of variable frequency is provided. The inverter 23 is controlled by the inverter control circuit 24. That is, the inverter control circuit 24
Is the speed detection signal of the motor 3 and the position signal of the car 6,
A signal for controlling the inverter 23 is output by a signal from a car or a hall. The configuration of the power conversion device 2 is the same as that of Japanese Patent Laid-Open No. 2001-187676, and is known as a normal elevator drive device.

A power supply device 8 is connected between the AC power supply 1 and the power conversion device 2. The power supply device 8 works so that the power receiving current is substantially constant with respect to the power supply 1, and works to supply the power required by the load to the load side after the power conversion device 2. Next, a specific example of the power supply device 8 will be described.

FIG. 2 is a block diagram of a main circuit and a control circuit of an embodiment of the power supply device 8. The alternating current from the alternating current power supply 1 is passed through a filter 81 that suppresses harmonics of the power supply current,
It is converted into direct current by the rectifier 82. The smoothing capacitor 83 removes the pulsation from the DC voltage of the rectifier 82, and the voltage is supplied to the inverter 84. The inverter 84 is connected to the power conversion device 2 that is a load through a filter 85 that converts direct current into alternating current and removes voltage harmonics.

The secondary battery 86 is connected to the DC side main circuit of the rectifier 82 via the charging / discharging device 87. The charging / discharging device 87 includes a reactor 871 and transistors (power elements) 872 and 873, and operates as a step-up / down chopper. The charging / discharging device 87 is controlled by the charging / discharging control circuit 88, and as a result, the current flowing in and out of the battery 86 is controlled. In addition, the output voltage of the power supply device 8 is controlled by the function of the inverter control circuit 89 to operate the inverter 84, and is controlled to a voltage according to the target, and supplies the power required for the power conversion device 2.

The charge / discharge control circuit (chopper control circuit in this embodiment) 88 is constructed as follows. The power supply current target calculation unit 880 calculates a target value of the power supply current from the AC power supply 1 as described later. Alternatively, the target value of the power receiving current can be set in accordance with the operator's artificial setting operation in the current target setting operation unit (operating means) 8801. The power supply power control unit (APR) 881 works according to the deviation between the power supply current target value and the signal proportional to the magnitude of the current from the AC current detector 882, and calculates the target value of the DC voltage of the rectifier 82. . The target value of the DC voltage is set so that the AC current from the power source becomes almost the target value. The voltage control unit (AVR) 883 is the power supply power control unit (APR) 8
81 and the rectifier 82, which operates according to the deviation of the signal from the DC voltage detector 884 that measures the DC voltage, and the output signal becomes the target value of the current flowing in the battery 86. Since the maximum current value that can flow in and out of the battery 86 differs depending on the battery state, as will be described later, the battery state calculation unit 885 applies a limiter 886 to the DC current target value. The current control unit (ACR) 887 outputs the output of the limiter 886,
DC current detector 88 for detecting the current flowing into the battery 86
It works according to the deviation of the signal from 8. Pulse width modulator (P
The WM) 889 responds to the output of the current control unit (ACR) 887, and the transistor 8 of the charging / discharging device (chopper) 87.
A PWM signal for turning on / off 72 and 873 is output to drive these transistors. The control calculation of the charge / discharge control circuit 88 can be realized by software.

The state of charge of the battery 86 is calculated and detected by the battery state calculator 885 of the control circuit 88 based on the information from the battery voltage detector (not shown) and the direct current detector 888. The amount of power that can be absorbed by the battery 86 and the amount of power that can be discharged vary depending on the characteristics of the battery 86 itself and the charging / discharging state. The dischargeable electric power and the chargeable electric power are calculated by the charging state of the battery, the history of the amount of charge and discharge, the number of times, the temperature, etc., and the maximum electric power (current) that can be charged and discharged in the battery is determined based on this. The charging / discharging device 87 is controlled so that the charging or discharging current is within this value at the maximum. The battery 86
Is composed of a combination of single cells (cells), it is desirable to add a device for charging and balancing the load between the single cells.

With the above configuration, the magnitude of the AC power receiving current flowing from the AC power source 1 into the rectifier 82 is controlled. That is, the alternating current flowing from the alternating current power source 1 into the rectifier 82 is detected by the alternating current detector 882, the charging / discharging device 87 is operated so that this current is always substantially constant, and the electric power extracted from the power source 1 is accompanied by this. The battery 86 is charged with.

The current target calculator 880 has means for setting the target current value to be smaller than the input current value in the rated operation of the intermittent load and to continue within a predetermined time regardless of the stop of the load operation. Constitute. Details will be described later.

In this configuration, the power supply device 8 itself is
Although it can be said that the energy storage device 86 is connected between the AC power supply 1 and the load 2, it is equivalent to being connected in parallel to the load 2 in the DC stage provided in the power supply device 8. However, the above-mentioned JP 2001-95
The energy storage device 86 may be connected to the DC stage of the power conversion device 2 of FIG. 1 of the present application, as in Japanese Patent Laid-Open No. 175 and Japanese Patent Laid-Open No. 2001-187676. Further, even if the energy storage device 86 is connected in parallel to the AC power source as in the above-mentioned JP 2001-327083 A, the same effect can be achieved.

Next, the inverter control circuit 89 for controlling the output voltage of the power supply device 8 is constructed as follows. The voltage command calculation unit 891 calculates a signal that commands the AC voltage instantaneous value of the output of the power supply device 8. Voltage control unit (AVR) 89
2 works according to the voltage command from the voltage command calculation unit 891 and the signal deviation from the voltage detector 893 that detects the AC output voltage instantaneous value. The pulse width modulator (PWM) 894 is
A PWM signal for turning on / off the transistor of the inverter 84 is output according to the output of the voltage control unit (AVR) 892. Further, since the output current of the inverter 84 is limited, control is performed to limit it within the maximum current value. Although illustration is omitted, a minor ACR with a limiter is provided,
It is conceivable to detect the output current and narrow down the voltage command.
The above-described operation of the inverter control circuit 89 can be implemented by software instead of hardware. Depending on the configuration of the filter 85, the output voltage of the power supply device 8 may be distorted when the inverter 84 is caused to perform the normal PWM operation. In this case, software or
Hardware implementation is preferred.

With the above configuration, the output voltage of the power supply device 8 is controlled to an AC voltage having a magnitude and frequency according to the voltage command. Further, as a result, the power conversion device 2, which is a load, is supplied with the power necessary for this device.

FIG. 3 is a graph showing the power exchange status according to the above embodiment. Via the power converter 2
The motor 3 is repeatedly operated / stopped, and the required power during operation also changes. The power required for operation is mainly supplied from the power stored in the battery 86. In FIG. 3, (a) shows a power waveform during operation when there is no power supply device according to this embodiment, and (b) shows a power waveform during operation.
When the power supply device 8 of (a) is not provided, when the required power of the load required on the motor side (power of the power conversion device 2) shown in (1) is required, the received power from the power supply 1 is shown in (2). As described above, the power becomes almost equal to (1) (actually, the loss increases slightly). Next, in the case with the power supply device 8 of (b), since the power supply current is controlled so as to be almost constant as described above, the received power from the power supply 1 as shown in (2),
That is, the current becomes constant. Its value can be much smaller than in the case of (a). The battery 86 is controlled so that a power having a difference between the required power (1) and the received power (2) flows, and is charged and discharged as shown in the battery charging and discharging power (3). That is, the battery releases the stored power when the load needs the power, based on the constant charging power during the rest of operation. As is clear from the figure, the power received from the AC power supply 1 is 15 to 1 of the rated power of the intermittent load.
It is enough to continue 0%. Therefore, the capacity of the power supply equipment is 15 to 10%.

When the power conversion device 2 has the configuration shown in FIG. 1, the regenerative power from the motor 3 cannot be returned from the rectifier 21 to the power source. However, if the rectifier 21 is configured as a reversible rectifier that can be regenerated as a power source, the power returned to the power source side charges the battery 86 with the configuration of FIG. Further, although the case where the secondary battery 86 is used as the energy storage element of the power supply device 8 is shown here, a capacitor, a flywheel, a superconducting device, or a combination thereof can be applied in addition to the battery.

In this embodiment, the received current received from the power source 1 is smaller than the input current value in the rated operation of the intermittent load (2 or later), and the scheduled time is irrespective of whether the intermittent load is operated or stopped. A current control system 881 for controlling to a target current value that continues in the band is provided.

With this configuration, the value of the current flowing from the power source 1 can be significantly reduced below the rated value, and the power source equipment can be reduced in size. As a result, in the intermittent operation load in which the on / off operation is repeated, such as running / stopping in the elevator, the contract power of the power supply can be reduced, and the contract power charge paid to the power supply facility can be reduced. Further, since the power supply equipment capacity is reduced, the equipment capacity received from the power company or the power supply equipment capacity from the power receiving point to the intermittent operation load equipment can be reduced.

In the case of an elevator, for example, the substantially constant current value flowing from the power supply is set according to the operation frequency, operation plan, or purpose, number of floors, etc. as seen from the motor capacity of the elevator. Elevators do not always operate at maximum load, and there are also suspensions. Therefore, since the electric power to be received fluctuates, if the electric power is leveled and received, the power supply current value at this time is significantly larger than the maximum power supply current value when the power supply device 8 of the present embodiment is not provided. It can be reduced. When the present power supply device 8 is provided and constant power receiving current control is executed at all times, the power supply equipment capacity is a fraction to one tenth, depending on the operating conditions of the elevator.
It can be reduced to a certain degree. In accordance with this, the current value to be received is set, and the contract power is set based on this.

In this case, the electric power charge may vary depending on the time zone in which the electric power is consumed. At this time, the rate of constant charging may be changed depending on the time zone, and the power supply current value may be changed for each time zone. As a special example, it is also possible to make the current received during a certain time period zero. In short, consider the contracted electricity rate and the hourly electricity rate,
The power supply current value may be set so that the required amount of power can be obtained at the lowest cost.

The power supply current value can be set as follows. That is, before installing the power supply device 8, the elevator is operated in advance for a certain period of time, how much electric power is required is measured, and the setting is made based on this. For example, by measuring the maximum value of the amount of electric power required for one-day operation, the amount of electric power that can be supplied over a day with constant power can be calculated. As an example, if the maximum daily power consumption is 10 [kWh], the constant charging power is 10/24 = about 0.417.
Since it becomes [kW], add the loss due to charge and discharge to this,
The current value corresponding to that value is determined.

The current value flowing from the power supply can be set as follows. The load to which the power supply device 8 is connected is not limited to the elevator, and may be another load in which operation suspension is repeated. Moreover, you may supply together. In this case, the power receiving current is determined so that the power can be supplied to the load when the entire power receiving system including the elevator receives the constant power. There are some loads to be connected that work only in a specific case such as emergency. In this case,
It is possible to further reduce the contracted power and the capacity of the power supply equipment. In this way, it is desirable to set the target value for the power receiving current according to the actual value or the planned value of the total power consumption within the scheduled time of the load that is intermittently operated.

Here, the case of the elevator is shown as the load for intermittent operation, but the configuration and the method of setting the power supply current shown in the drawing can be applied to the load for intermittent operation in the same way as above. In addition to the elevator, such a load may be a pump, a lighting facility, an air conditioning facility, or a combination thereof, and a combination of a continuously operating load and an intermittently operating load.

The configurations shown in FIGS. 1 and 2 are effective even when the power supply fails. That is, since the battery 86 is constantly charged, the elevator, which is the load of the power supply device 8, can always be operated at the same usage method and speed as usual, regardless of whether or not there is a power failure. Therefore, it is not necessary to provide a special device for the power failure such as an automatic landing device at the time of power failure in the elevator device. In addition, due to the convenience of the building, when a power failure occurs, the power failure detection means detects the power failure and drives the car to a specific floor to stop it, or drives to the destination floor just before the power failure, and then restores the power failure. The elevator can also be stopped. A power failure is detected by the power supply device 8, and the power conversion device 2
It is desirable to send a signal to and perform the above. When the power is restored, send a signal to operate normally. As a result, the elevator can be operated with peace of mind without being affected by the power failure.

In the event of a power failure, it is necessary to make the current flowing from the power source zero. When a power failure is detected, the power supply current target calculation unit 880 sets the target value to zero, and the charge / discharge control circuit 88 operates so that the power supply current becomes zero.

1 and 2, the following operation is possible. That is, in FIG. 2, for example, when the battery 86 is insufficiently charged, the power required by the power conversion device 2 may not be supplied from the battery 86 simply by receiving a constant current from the power source 1. At this time, the power status of the power supply device 8 is notified to the power conversion device 2 by the calculation of the battery state calculation part 885, and the power conversion device 2 limits the number of times of operation or the frequency of start-up, or sets the speed accordingly. It is possible to continue operation according to the condition such as limiting.

As described above, when the use of electric power cannot maintain the desired state, the load can be operated according to the state of the power supply device 8 by a predetermined method.

As described above, according to this embodiment, the received current from the power source is supplied regardless of whether the load is running or stopped.
By controlling to a constant value within a predetermined period, it is possible to greatly reduce the power receiving current, that is, the power receiving capacity. Further, it becomes possible to continue the operation of the load at the time of power failure. In other words, it is possible to not only simply cut the peak of the power supply, but also level the power consumption greatly,
It is possible to operate the load without being affected by a power failure.

FIG. 4 is a schematic block diagram of an elevator apparatus according to another embodiment of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals and will not be described repeatedly. It is characterized in that the monitoring center 9 and the power supply device 8 are connected by a network 10 so that the condition of the power supply device 8, especially the condition of the battery 86 is monitored. Since the battery 86 has a life, it is necessary to perform maintenance. The charge state of the battery 86 held in the charge / discharge control circuit 88 of FIG.
The state of the battery such as the number of times of charging / discharging and temperature is monitored by the monitoring device (monitoring means) 91 of the monitoring center 9 through the network 10, and an instruction is issued by the maintenance command generating means for performing maintenance or replacement as needed. In particular, if the battery 86 is defective, an instruction to perform maintenance or replacement is issued immediately.

The configuration shown in FIG. 4 further enables the following operation. That is, the power supply device 8 can be installed as an option in an existing elevator that is a load. At this time, the installation and operation of the power supply device 8 can be performed by the operator of the monitoring center 9 or a person entrusted from it, and the rental form can be provided. The contracted power capacity of the AC power supply 1 is reduced, and the operating state of the power supply device 8 and the saved contracted power amount are managed by the monitoring device 91 of the monitoring center 9 through the network 10. The owner or the administrator of the power supply device 8 calculates the usage charge by a predetermined method according to the installation condition of the power supply device 8 or the saved power charge, and the owner of the elevator, the owner of the elevator or the building The person or administrator is notified and the fee is charged by the charging means.

FIG. 5 shows a data processing flow up to charging in the rental form shown in FIG. Chopper control circuit 88
In the internal processing flow 510, first, in step 511, operating states such as charge / discharge electric energy and power supply current are measured. Next, in step 512, the monitoring device 91 in the monitoring center 9 is notified of these data at a predetermined time or a predetermined interval through the network 10. In the processing flow 520 of the monitoring device 9, first, in step 521, the amount of power used and the amount of contracted electric power saved according to a predetermined calculation method are received from the operating state such as charging / discharging power amount and power supply current in response to data notification. To calculate. In addition, based on these, the usage fee is calculated by a predetermined method. Then, in step 522, the person designated for each device, that is, the person who uses the elevator or the owner or manager of the elevator or building is notified and charged. Although the flow of FIG. 5 describes only the charge management, the control circuit 88 also monitors signals such as equipment operating status, safety monitoring, and failure prediction necessary for managing and operating the power supply device 8. It is exchanged with the device 9. Further, the monitoring device 9 may be connected to the power conversion device 2 so as to also monitor the elevator, which is a load.

FIG. 6 is a block diagram of a main circuit and a control circuit of a power supply device according to another embodiment of the present invention. In FIG. 6, the same reference numerals as those in FIG. 2 indicate the same hardware or functional units, and redundant description will be omitted. The embodiment of FIG. 6 differs from that of FIG. 2 in that the charge / discharge current control for the battery 861 is controlled by the power converter 8.
21 is the point to be executed. By the operation of the power supply converter 821, the DC voltage of the main circuit of the power supply device 8, that is, the voltage across the smoothing capacitor 83 is controlled to flow into the battery 861.
Control outflow current. The current to the battery 861 is smoothed by the reactor 874.

The control of the power supply converter 821 and the idea of the charge / discharge control circuit 88 are the same as in the case of FIG. 2, but the target value of the DC voltage is higher than the rectified voltage value when the AC current from the power supply is almost zero. The value is set to a value corresponding to the voltage of the battery 861. That is, in FIG. 2, although there is a degree of freedom in the set voltage of the battery 86 by the buck-boost chopper 87, the rectifier 8
The output voltage of the power supply device 8 decreases due to the rectification loss of 2 and the PWM control loss of the inverter 84. On the other hand, in FIG. 6, since the converter 821 controls charging / discharging of the battery 861, the target value of the DC voltage is slightly higher than the rectified voltage value when the AC current from the power source is almost zero as described above. If set to a value, the output voltage will not drop. However, on the other hand, the battery 861 has no degree of freedom in voltage.

From the voltage control unit (AVR) 883 to the current control unit (ACR) 887, the same operation as in FIG. 2 is performed.
The pulse width modulator (PWM) 889 is a current controller (AC).
R) Outputs a PWM signal for turning on / off the transistor of the power supply converter 821 according to the output of 887, and controls the power supply converter 821 in synchronization with the AC voltage of the AC power supply 1. The operation of the inverter 84 is exactly the same as in the case of FIG.

According to the above construction, the same purpose as in FIG. 2 is achieved, and the DC voltage is maintained at a predetermined value even if the power supply voltage fluctuates, so that the output voltage of the power supply device 8 is always constant. It has the advantage of being kept at a value.

FIG. 7 is a block diagram of a main circuit and a control circuit of a power supply device according to still another embodiment of the present invention. Figure 7
Among them, the same reference numerals as those in FIGS. 2 and 6 indicate the same hardware or functional units, and duplicated description will be omitted. The embodiment of FIG. 7 is shown in FIG.
6 is that the power supply converter 821 functions to control the output DC voltage of the converter 821 to a substantially constant level, and the charge / discharge current control for the battery 86 is executed by the charge / discharge device 87. . Therefore, the output voltage of the power supply device 8 does not decrease while maintaining the degree of freedom in setting the voltage of the battery 861.

The charging / discharging device 87 includes a charging / discharging control circuit 881.
Controlled by. The control circuit 881 is configured as follows. The power supply current target calculation unit 880 calculates the target value of the power supply current from the AC power supply 1 as described above. The signal from the AC instantaneous current detector 8821 is input to the power supply current peak value detection 8822, and the current peak value of the power supply 1 is detected. The power supply current control unit (APR) 8811 works according to the deviation between the power supply current target value and the signal from the current peak value detection unit 8822, and outputs the target value of the current flowing in / out of the battery 86. Since the maximum current value that can flow in and out of the battery 86 differs depending on the battery state as described above,
The battery state calculation unit 8851 applies a limiter 8831 to the DC current target value. Current control unit (ACR) 8871
Operates according to the deviation of the signal from the limiter 8831 and the DC current detector 888 that detects the current flowing into the battery 86. The pulse width modulation unit (PWM) 8891 outputs a PWM signal for turning on / off the transistors 872 and 873 of the charging / discharging device (chopper) 87 according to the output of the current control unit (ACR) 8871, and drives these transistors. To do.

Next, the control operation of the power converter 821 will be described. Power converter 821 is controlled by converter control circuit 110. The control circuit 110 is configured as follows. The DC voltage command unit 111 commands a target value of the main circuit DC voltage. This target value is set to be higher than the rectified voltage of power supply converter 821 when the AC power supply current is substantially zero. The voltage control unit (AVR) 112 works according to the DC voltage command and the deviation of the signal from the DC voltage detector 113, and calculates the target value of the magnitude of the AC power supply current.
The output is multiplied by the AC instantaneous voltage whose insulation is detected by the detector 114 and the multiplying unit 115. That is, the output of the multiplication unit 115 becomes a signal instructing the instantaneous value of the AC current, which is synchronized with the AC power supply 1. It goes without saying that the synchronization with the AC power supply 1 may be performed by another method such as detecting a zero cross of the AC voltage. Current control unit (ACR) 116
Is the output of the multiplication unit 115 and the AC instantaneous current detector 8821.
It works according to the output deviation. Pulse width modulator (PWM)
Reference numeral 117 outputs a PWM signal for turning on / off a transistor of power supply converter 821 according to the output of current control unit (ACR) 116 to control this converter.
The current control of the AC power supply 1 does not control the instantaneous value of the AC current as in this example, but may control by calculating and detecting the component of the AC power supply current.

In this way, the control operation is performed so that the DC intermediate portion of the power supply device 8, that is, the voltage across the smoothing capacitor 83 becomes constant. Since both the power supply current and the DC voltage of the main circuit are controlled so as to be the target, the difference between the power supply current and the required power of the load is charged and discharged from the battery. The operation of the inverter 84 is exactly the same as in the case of FIG.

According to the above configuration, there is an advantage that the output voltage of the power supply device 8 is not lowered and the battery voltage can be freely selected.

The present invention can have different configurations other than those shown and described. For example, it may be configured by appropriately combining FIG. 2, FIG. 6 and FIG. 7.

In the above embodiments, the case where the power source is an AC power source has been described, but the present invention can also be applied to a DC power source, a fuel cell and the like.

[0049]

According to the present invention, by simply connecting a relatively simple device to the power supply, it is possible to suppress fluctuations in the power received from the power supply and to greatly reduce the capacity of the power supply equipment.

If necessary, the load can be continuously operated even during a power failure.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an elevator apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of a main circuit and a control circuit of an embodiment of a power supply device according to an embodiment of the present invention.

FIG. 3 is a graph showing a power exchange situation according to an embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of an elevator apparatus according to another embodiment of the present invention.

5 is a flow chart of data processing up to charging in the rental form of FIG. 4;

FIG. 6 is a block diagram of a main circuit and a control circuit of a power supply device according to another embodiment of the present invention.

FIG. 7 is a block diagram of a main circuit and a control circuit of a power supply device according to still another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... AC power supply, 2 ... Power converter, 21 ... Rectifier, 23
... Inverter, 3 ... Elevator drive motor, 8 ... Power supply device, 82 ... Converter, 821 ... Controllable converter, 8
3 ... Smoothing capacitor, 84 ... Inverter, 86 ... (Secondary) battery, 87 ... Charge / discharge device, 88 ... Charge / discharge control circuit,
89 ... Inverter control circuit, 9 ... Monitoring center, 91 ...
Monitoring device, 10 ... Network, 110 ... Converter control circuit.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shunsuke Mine             1070 Ichimo, Hitachinaka City, Ibaraki Prefecture Stock Association             Hitachi Building Co., Ltd. Mito Bi             Le System Headquarters (72) Inventor Atsuya Fujino             1070 Ichimo, Hitachinaka City, Ibaraki Prefecture Stock Association             Hitachi Building Co., Ltd. Mito Bi             Le System Headquarters (72) Inventor Reiko Kanada             7-1-1, Omika-cho, Hitachi-shi, Ibaraki Prefecture             Inside the Hitachi Research Laboratory, Hitachi Ltd. F-term (reference) 3F002 CA06 CA08 EA05 EA07 EA08                       GA03 GB02                 5G003 AA01 BA01 CA01 CC02 DA04                       GB03 GB06                 5G066 JA02 JA03 JB03

Claims (12)

[Claims] 1. A load, which is connected to a power supply and is intermittently operated, an energy storage device connected to the power supply, a charging / discharging device for the energy storage device, and a control device for controlling the charging / discharging device. In the power supply device, the control device, the power receiving current received from the power supply is smaller than the input current value in the rated operation of the intermittent load, and to a target current value that continues regardless of the operation or suspension of the intermittent load. A power supply device comprising a current control system for controlling. 2. A load, which is connected to a power source and is intermittently operated, an energy storage device connected to the power source, a charging / discharging device for the energy storage device, and a control device for controlling the charging / discharging device. In the power supply device, the control device controls the power reception current received from the power supply to a target current value that continues regardless of the operation or suspension of the intermittent load, and a target current value for the intermittent current. The power supply device is provided with a unit that is smaller than the input current value in the rated operation of and is set to continue within a predetermined time. 3. A power supply device comprising an energy storage device inserted between a power supply and a load which is intermittently operated, a charging / discharging device for the energy storage device, and a control device for controlling the charging / discharging device, The control device controls the power receiving current supplied from the power supply to the power supply device to be smaller than an input current value in the rated operation of the intermittent load, and to a substantially constant value that continues regardless of the operation or the suspension of the intermittent load. A power supply device having a current control system for 4. The power supply device according to claim 1, further comprising means for setting a target value for the received current to a substantially constant value within a scheduled time. 5. The target value for the power receiving current is set according to any one of claims 1 to 4, in accordance with an actual value or a planned value of total power consumption within a scheduled time of the load that is intermittently operated. A power supply device comprising means. 6. A power supply device according to claim 1, further comprising operation means for setting a target value for the received current. 7. The power supply device according to claim 1, further comprising means for setting a target value for the power receiving current for each time period. 8. A means for detecting a power failure of the power source and / or a means for detecting that the power supply device cannot supply a desired power, and outputs of these detection means according to any one of claims 1 to 7. According to the above, a power supply device comprising means for operating the load in a form different from usual. 9. A means for monitoring a state of a device including an energy storage state of the energy storage device according to claim 1, and a means for generating a maintenance command in accordance with an output of the monitoring means. A power supply device characterized by being provided. 10. The power supply device according to claim 9, which is a rental product, and is provided with means for charging a user, owner, or manager of the intermittently operated load according to a predetermined method. And power supply. 11. A power converter connected to an AC power source for outputting a variable voltage / variable frequency AC, an elevator drive motor fed from this power converter, an elevator driven up and down by the motor, and the AC. An energy storage device connected to a power supply, a charging / discharging device for the energy storage device, and an elevator apparatus including a charging / discharging control device for controlling the charging / discharging device, wherein the charging / discharging control device is connected to the AC power source. The received current to be received is
An elevator apparatus comprising a current control system that is smaller than a rated input current value of the elevator and is controlled to a substantially constant value that continues regardless of whether the elevator is running or stopped. 12. The elevator apparatus according to claim 11, wherein the target value of the received current supplied to the current control system is 15% or less of a rated input current value of the elevator.