KR20110050375A - Elevator control device, and control method - Google Patents

Abstract

PURPOSE: A device and a method for controlling an elevator is provided to allow a super capacitor to absorb excessive electricity by charging a battery with electricity accumulated in the capacitor. CONSTITUTION: A device for controlling an elevator comprises a battery(21), a super capacitor(31), a battery charging/discharging circuit(22), a super capacitor charging/discharging circuit(32), and a charging/discharging control circuit(40). The battery charges electricity or discharges the charged electricity depending on the operation state of an elevator. The super capacitor charges or discharges the electricity depending on the operation state of the elevator. The battery charging/discharging circuit charges or discharges the battery. The super capacitor charging/discharging circuit charges or discharges the super capacitor. The charging/discharging control circuit controls the battery charging/discharging circuit and the super capacitor charging/discharging circuit.

Description

Elevator control device and control method {ELEVATOR CONTROL DEVICE, AND CONTROL METHOD}

The present invention relates to a control device and a control method of an elevator using a battery and a high capacity condenser.

As a conventional elevator control apparatus, there exists a control apparatus disclosed by patent document 1, for example. The elevator control apparatus of patent document 1 is briefly demonstrated, referring FIG.

5, 1 is a commercial three-phase AC power supply, 2 is an electric motor such as an induction motor, 3 is a winch, 4 is a rope, 5 is an elevator car, 6 is a balance weight, 7 is an encoder, 8 is a controller, and 9 is a diode. And a converter, 10 is a capacitor, 11 is a current transformer, 12 is an inverter, 13 is an inverter control circuit, 14 is an inverter drive circuit, 15 is a regenerative resistor, 16 is a switching means such as an IGBT.

The operation of the conventional elevator control apparatus will be described with reference to the drawings.

The elevator rotates the winches 3 by the electric motor 2 to move the elevator car 5 and the balance weight 6 connected to both ends of the rope 40 to carry the passengers in the car 5 to the desired floor.

The converter 9 rectifies AC power supplied from the commercial power supply 1, converts it into DC power, and accumulates it in the capacitor 10. The inverter 12 converts this DC power into AC power of variable voltage and variable frequency.

The controller 8 determines the start and stop of the elevator and issues a command to control the position and the moving speed of the elevator. The inverter control circuit 1 drives the electric motor 2 by the current feedback from the current detector 11 and the speed feedback from the encoder 7 on the basis of the command of the controller 8, and thus the position, speed, etc. of the elevator. Execute control. At this time, the inverter control circuit 13 controls the output power and frequency of the inverter 12 through the gate drive circuit 14.

The balance weight 6 of an elevator is set in balance when a suitable passenger boards the car 5 of an elevator. In general, when the passenger 5 near the full-floor occupies the elevator car 5, or when the elevator 5 descends while the car 5 is empty, the car 5 of the elevator is moved to a predetermined speed. The electric power generated in the order of the commercial AC power source (1), converter (9), and inverter (12) is supplied to the electric motor (92) to drive the car by driving the car (5) of the elevator by the rotational force of the electric motor (2). Driving (hereinafter referred to as "reverse driving") is performed so as to cause the driver to descend to the car 5 of the elevator in a state where a passenger close to 10,000 won boards, or When the car 5 of the car rises near the empty state, since the car 5 of the elevator can move itself, electric power is generated in the order of the electric motor 2 to the inverter 12 to smooth the inside of the converter 9. Kerr It is in an operating state to return the power (this power is called "regenerative power") to the sitter (hereinafter, this operating state will be the same, also known as "regenerative operation").

However, in general, since the smoothing capacitor has a very small capacity and cannot absorb all of the regenerative power, the regenerative power is consumed by converting the regenerative resistor 15 into thermal energy by controlling the switching means 16.

Patent Literature 1 also solves the problem that the regenerative power is insignificantly consumed as thermal energy in the regenerative resistor, while accumulating the regenerative power and discharging the elevator to the nearest floor during a power failure of the commercial power supply. Elevator control device that can save energy is proposed.

Specifically, as shown in FIG. 6, the power accumulator 21, which is formed of a battery or a capacitor and stores DC power, manages charge and discharge states of the power accumulator and is based on operation information from a controller. A charge / discharge control circuit 23 for outputting a driving signal when charging the DC power to the power storage device, and outputting a stop signal when the voltage of the accumulator reaches a predetermined voltage and stops charging; An elevator control device having a charge / discharge circuit 22 which starts charging DC power to a power storage device in accordance with a signal and stops charging in accordance with a stop signal is disclosed.

As a result, the regenerative power generated during the regenerative operation of the elevator is effectively used. In particular, during power failure, the elevator is placed on the nearest floor using the power stored in the power accumulator.

In addition, Patent Literature 2 connects an electric double layer capacitor in parallel to a DC power supply having a constant voltage, charges the electric double layer capacitor by regenerative power when driving the elevator motor, and at the time of acceleration of the elevator motor. An elevator driving power supply, which mainly supplies electric power to an electric double layer capacitor, has also been proposed.

Hereinafter, the structure and effect | action of the elevator drive power supply device of patent document 2 are demonstrated easily.

It is a figure which shows the structure of the elevator drive power supply apparatus of patent document 2.

The power supply includes a commercial AC power supply 1, a rectifier circuit 2 for converting the AC power of the commercial AC power source into DC power, a DC capacitor 3 for smoothing the DC power converted in the current circuit 2, Resistor chopper connected in parallel to the inverter 4 and the DC capacitor 3, which converts the smoothed DC power of the DC capacitor 3 into AC power of a required frequency and supplies it to the motor 11, and consumes regenerative power as heat. (18) Similarly, the electric double layer capacitor 21 connected in parallel to the DC capacitor 3, the voltage detection circuit 22 for detecting the terminal voltage of the electric double layer capacitor 21, and a predetermined speed command. The drive control part 5 which controls the inverter 50 based on the rotational speed of the electric motor 11, or operates the resistance chopper 18 as needed is provided.

The electric double layer capacitor 21 has a larger capacitance than the DC capacitor 3, and has a function of storing energy capable of charging and discharging by a large current in a very short time. It has a capacity to accumulate most regenerative power.

The drive control unit 5 sets the voltage near the rated voltage of the electric double layer capacitor 21 as the operating voltage of the resistor chopper, charges the electric double layer capacitor by regenerative power, and then continues the electric double layer. When the terminal voltage Vc rises due to the accumulation of electric power in the capacitor, the resistance chopper is controlled to operate when the terminal voltage detected by the voltage detection circuit reaches the terminal voltage of the electric double layer capacitor.

Patent Literature 3 also discloses an elevator control device similar to Patent Literature 1.

Patent Document 1: Japanese Patent Application Laid-Open No. 2001-240322 Patent Document 2: Japanese Patent Application Laid-Open No. 2005-263409 Patent Document 3: Publication No. 2001-0018601

In recent years, with the rise of buildings, the operating hours of elevators have also become longer, and thus, the regenerative operation period which takes up the entire operating time of elevators has also increased. In other words, in the case of ultra-high-rise buildings, buildings with tens of floors from the lowest floor to the highest floor, and in many cases more than 100 floors, are appearing one after another, and the regenerative operation period of elevators is rapidly increasing. The amount of regenerative power that can be accumulated and reused in an accumulator is also increasing dramatically.

On the other hand, as shown by the hatched portion in Fig. 8, which is a diagram showing an example of the power consumption during the reverse operation of the elevator, the voltage or current is in a steady state due to the transient power in the period when the elevator transitions from the stationary state to the reverse operation. It is a very large value compared to. This also applies to the period in which the elevator shifts from the retrograde operation to the regenerative operation.

In addition, the battery has the advantage of being able to charge a relatively large amount of power compared to the capacitor, but on the contrary, the ability to charge the transient power in a short time in a short time, and in particular in a transient state over the rated voltage (or rated current) of the battery If charging and discharging are repeated, there is a problem that the performance deteriorates suddenly and the life thereof is significantly shortened.

On the contrary, the capacitor has a smaller amount of power than the battery, but on the contrary, the transient power can be charged and discharged at a high charge rate in a short time, which is relatively suitable for the recovery of the regenerative power of the elevator. Even if charging and discharging are repeated in a transient state of more than a current), the performance deterioration and the reduction of the lifespan are smaller than those of the battery, but they are much more expensive than the batteries having the same charging capacity.

Therefore, by appropriately matching the advantages and disadvantages of the battery and the capacitor, part of the transient power above the rated voltage (or rated current) of the battery among the power charged in the battery used as a means of accumulating the regenerative power in the transient period during the regenerative operation. Charge the capacitor, and the normal regenerative power after this transient period is charged by the battery. For example, when the elevator stops, the power charged to the capacitor is transferred to the battery, i.e. By reducing the burden on the battery during the transient period, such as by allowing the capacitor to absorb the excess power during the next regenerative operation, it is possible to extend the life of the battery and to control the elevator operation control circuit. It is very desirable in terms of reducing maintenance costs.

However, Patent Document 1 employs only one of a battery or a capacitor as a means for accumulating regenerative power, and Patent Document 2 employs only a capacitor as means for accumulating regenerative power, and Patent Document 3 also employs only a battery. The above problems cannot be solved by the prior art.

The present invention has been made in view of the above problems, and the present invention provides a converter for rectifying and converting AC power into DC power, an inverter for converting DC power into AC power having a variable voltage and a variable frequency, and the variable voltage and variable frequency. An elevator control device including a controller for controlling an electric motor to operate an elevator by AC power, the elevator control device comprising: a battery for charging electric power or discharging a charged electric power according to an operating state of the elevator, and an operating state of the elevator A supercapacitor for charging or discharging electric power, a battery charge / discharge circuit for charging electric power or discharging electric power charged in the battery, and charging or supercharging the supercapacitor Discharge of Discharged Power A charge / discharge circuit, and a charge / discharge control circuit for controlling the battery charge / discharge circuit and the supercapacitor charge / discharge circuit. The charge / discharge control circuit includes a battery and a super when the elevator performs regenerative operation. Characterized in that the control to charge the regenerative power to the capacitor.

Preferably, the charge and discharge control circuit is characterized in that the control to discharge the power charged in the battery and the supercapacitor when the elevator is in reverse operation.

Preferably, the charge and discharge control circuit is characterized in that the control to discharge the power charged in the supercapacitor prior to the discharge of the power charged in the battery.

Moreover, the elevator control apparatus of this invention is based on the converter which rectifies AC power and converts into DC power, the inverter which converts said DC power into AC power of a variable voltage and a variable frequency, and the AC power of the variable voltage and a variable frequency. An elevator control apparatus having a controller for controlling an electric motor to drive an elevator, comprising: a battery for charging electric power or discharging a charged electric power according to an operating state of the elevator, and charging electric power according to an operating state of the elevator; A supercapacitor for discharging, a battery charge / discharge circuit for discharging electric power charged to or in the battery, and a supercharger for discharging electric power for the supercapacitor or the supercapacitor; Capacitor charging and discharging circuits, and the battery charging And a charge / discharge control circuit for controlling the discharge circuit and the supercapacitor charge / discharge circuit, wherein the charge / discharge control circuit controls to recharge the battery with the power charged in the supercapacitor when the elevator is stopped. Characterized in that.

In addition, the elevator control method of the present invention is based on a converter for rectifying the AC power to convert to DC power, an inverter for converting the DC power into an AC power of a variable voltage and variable frequency, and an AC power of the variable voltage and variable frequency. An elevator control method in an elevator control apparatus including a controller for controlling an electric motor to drive an elevator, wherein the elevator control apparatus includes a battery and a supercapacitor for charging electric power or discharging the electric power according to an operation state of the elevator. And an operation state monitoring step of monitoring an operation state of the elevator, and a charging step of charging the regenerative power to the battery and the supercapacitor if the elevator is determined to be in regenerative operation in the operation state monitoring step.

As described above, the present invention distributes and accumulates the regenerative power generated during the regenerative operation of the elevator to the battery and the supercapacitor, so that the transient voltage equal to or higher than the rated voltage (or rated current) of the battery among the electric power charged to the battery during the transient period during the regenerative operation. A part of the electric power is charged to the capacitor, and the normal regenerative power after the transient period is charged by the battery to prevent deterioration of the battery and to prolong the life of the battery.

In addition, the charging and discharging control circuit is controlled so as to discharge the charging power of the supercapacitor first in the retrograde operation of the elevator, and then discharge the charging power of the battery, so that the transient power is supplied to the supercapacitor 31 in the transient period during the regenerative operation. ) Can be absorbed, and as a result, the deterioration of the battery can be prevented and the effect of extending the life of the battery can be obtained.

Also, when the elevator is stopped, the power charged in the capacitor is moved to the battery, that is, the battery is charged with the power accumulated in the capacitor, so that the capacitor can absorb the excess power during the next regenerative operation, thereby deteriorating the battery. It can prevent the long life of battery.

1 is a view showing a schematic configuration of an elevator control apparatus of an embodiment of the present invention.
2A is a diagram illustrating an example of the battery charge and discharge circuit of FIG. 1, and FIG. 2B is a diagram illustrating an example of the supercapacitor charge and discharge circuit of FIG. 1.
3 is a view showing the principle that the regenerative power is charged and discharged to the battery 21 and the supercapacitor 31, respectively.
4 is a flowchart showing the operation of one embodiment of the present invention.
5 is a view showing a conventional elevator control circuit.
6 is a view showing another example of a conventional elevator control circuit.
7 is a view showing still another example of a conventional elevator control circuit.
8 is a diagram illustrating an example of power consumption during retrograde operation of an elevator.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 is a view showing a schematic configuration of an elevator control apparatus of an embodiment of the present invention. In FIG. 1, the same reference numerals as those in FIG. 6 are given to the same parts as those of the conventional elevator control apparatus of FIG. 6, and detailed description thereof will be omitted.

The commercial three-phase AC power supply 1 to gate drive circuit 14 in Fig. 1 is the same as each of the components in Fig. 6 showing the conventional example.

In a characteristic configuration different from that of FIG. 6 showing a conventional example in FIG. 1, the regenerative power during the regenerative operation is a high capacity capacitor such as the battery 21 and the electric double layer capacitor (hereinafter referred to as "supercapacitor 31"). In this case, the electric power charged in the battery and the supercapacitor can be properly discharged to the electric motor of the elevator as needed.

Also, as shown in FIG. 1, the elevator control apparatus of the present embodiment charges the regenerative power to the battery 21 during the regenerative operation of the elevator, or the power charged to the battery 21 during the retrograde operation. The battery charge / discharge circuit 22 for discharging and the supercapacitor charge for charging the regenerative power to the supercapacitor 31 during the regenerative operation of the elevator, or for discharging the electric power charged to the supercapacitor 31 for the retrograde operation. And a charge / discharge control circuit 40 for controlling charging and discharging of the discharge circuit 32, the battery charge / discharge circuit 22, and the supercapacitor charge / discharge circuit 32.

As shown in FIG. 1, the charge / discharge control circuit 40 includes the voltage Vb across the battery 21 and the charge / discharge current Ib of the battery 21 detected by the current detector 24. , The voltage Vuc across the supercapacitor 31 and the charge / discharge current Iuc of the supercapacitor 31 detected by the current detector 34, and the voltage Vdc across the inverter 12 are input. .

The charge / discharge control circuit 40 also receives, for example, a value BKM indicating whether the elevator is operating or not by detecting the driving state of the electric motor 2. Of course, this value BKM can also be input from the controller 8, for example BKM = 1 indicates that the elevator is in operation, and BKM = 0 indicates that the elevator is stopped.

In addition, the charge / discharge control circuit 40 is a reference value indicating the maximum charge voltage and the minimum discharge voltage of the battery 21, for example, Vdcref as the reference value of the voltage Vdc value, for example, an internal storage device or the like, respectively, Vb_max. And Vb_min, the reference values representing the maximum charge voltage and the minimum discharge voltage of the supercapacitor 31, respectively, Vuc_max and Vuc_min, the reference values representing the maximum charge current and the minimum discharge current of the battery 21, respectively, Ib_max and Ib_min, the supercapacitor. Iuc_max, Iuc_min, and the like are stored as reference values representing the maximum charge current and the minimum discharge current in (31), respectively. In addition, each reference value can be appropriately set as necessary, such as charging and discharging ratings of the battery 21 and the supercapacitor 31.

In accordance with the change of these voltage and current values or the BKM value, the charge / discharge control circuit 40 controls the battery charge / discharge circuit 22 and the supercapacitor charge / discharge circuit 32 appropriately so that the battery is at the time of regenerative operation. The regenerative electric power is charged to the 21 and the supercapacitor 31, or the electric power stored in the battery 21 and the supercapacitor 31 is discharged during the retrograde operation.

FIG. 2A is a view showing the configuration of the battery charge / discharge circuit 22 of the elevator control device of FIG. 1, and FIG. 2B is a view of the supercapacitor charge / discharge circuit 32 of the elevator control device of FIG. It is a figure which shows a structure.

First, the battery charge / discharge circuit 22 of FIG. 2A will be described. In FIG. 2A, 25 is a reactor, 26 and 27 are switching elements such as IGBT, and 28 and 29 are diodes connected in reverse parallel.

The battery 21 is charged by the step-down chopper circuit composed of the switching element 26 and the diode 29. The discharge from the battery 21 is made by a boost type chopper circuit composed of the switching element 27 and the diode 28.

The charging and discharging to the supercapacitor 31 is the same as the charging and discharging to the battery 21.

3 is a diagram illustrating a principle in which regenerative power is charged in the battery 21 and the supercapacitor 31, respectively, by the control of the charge / discharge control circuit 40.

First, Figure 3 (a) is a diagram showing the charging control principle that the regenerative power is charged to the battery 21 during the regenerative operation, reference numeral 53 in the figure when the predetermined condition is satisfied during the regenerative operation of the elevator A gate drive circuit for controlling the battery charge / discharge circuit 22 so that the battery charge / discharge circuit 22 charges the regenerative power to the battery 21, 54 is a PWM circuit for generating a PWM modulation signal, and 55 is a battery. A charge current controller for controlling a charge current command value by proportionally integrating, for example, a difference between the charge current reference value Ibref and the charge current detection value Ib of (21), and a battery charge / discharge circuit 22. It is a voltage controller that controls the DC voltage at the input terminal of the input voltage at the voltage command value by proportionally integrating the difference between the voltage reference value (Vdcref) and the actual value (Vdc). In addition, 60 and 62 are subtractors.

FIG. 3 (b) is a diagram illustrating a charging control principle in which regenerative power is charged in the supercapacitor 31 during the regenerative operation. The difference from FIG. 3 (a) differs from that of the supercapacitor 31 in the subtractor 60. The charging current reference value Iucref and the charging current detection value Iuc are input, respectively, and the charging current controller 55 determines the charging current reference value Iucref and the charging current detection value Iuc of the supercapacitor 31. The difference is calculated by, for example, proportional integration to control the charge current command value.

Even when the charging power charged in the battery 21 or the supercapacitor 31 is discharged to, for example, the electric motor side during the driving operation of the elevator, the configuration of the charge / discharge control circuit 40 is basically shown in FIG. ) Or (b), and differs only in that the input values of the subtractors 60 and 62 are different, and thus detailed description of this discharge time is omitted.

Next, the operation of the elevator control apparatus in this embodiment will be described with reference to FIG. 4.

The operation of the elevator control apparatus in this embodiment is a charging operation for charging the regenerative power to the battery 21 and the supercapacitor 31 during the regenerative operation of the elevator, and the battery 21 and the supercapacitor during the retrograde operation of the elevator. There is a discharge operation for discharging the electric power charged in (31) to an elevator driving motor, etc. Among these, the charging operation is a process of charging regenerative power to the battery 21 and the supercapacitor 31 during the regenerative operation, and It may be divided into a process of recharging the power charged in the supercapacitor 31 to the battery 21 at the time of stopping.

First, a process of charging regenerative power to the battery 21 and the supercapacitor 31 during the regenerative operation of the elevator will be described with reference to the flowchart of FIG.

In step S01 of Fig. 4A, the charge / discharge control circuit 40 determines whether the elevator is in operation or stopped. When it is determined that BKM = 1, the charge / discharge control circuit 40 recognizes that the elevator is operating. In step S03, the charge / discharge control circuit 40 compares the voltage Vdc and the reference voltage Vdcref of both ends of the inverter. Thus, if the voltage Vdc across the inverter is greater than the reference voltage Vdcref (Yes in step S03), the charge / discharge control circuit 40 determines that the elevator is in regenerative operation in step S04.

Subsequently, when it is determined in step S04 that the elevator is in regenerative operation, the charge / discharge control circuit 40 compares the voltage Vb across the battery 21 with the charging maximum voltage Vb_max in step S05, thereby allowing the battery 21 to be operated. If the voltage Vb at both ends is smaller than the charging maximum voltage Vb_max (Yes in step S05), the charge / discharge control circuit 40 adds the regenerative power to the state in which the battery 21 is chargeable, that is, the battery 21. It is determined that a spare capacity that can be charged remains, and the battery charge / discharge circuit 22 is controlled to control the regenerative power to be charged in the battery 21.

When the regenerative operation ends in step S09, the process returns to step S01.

In parallel with the control of steps S05 to S09, the charge / discharge control circuit 40 also executes the control of steps S06 to S09. That is, in step S06, when the voltage Vuc across the supercapacitor 31 is compared with the charging maximum voltage Vuc_max, if the voltage Vuc across the supercapacitor 31 is smaller than the charging maximum voltage Vuc_max (step Yes in S06) The charge / discharge control circuit 40 determines that the supercapacitor 31 is in a chargeable state, and controls the supercapacitor charge / discharge circuit 32 to charge regenerative power to the supercapacitor 31. After controlling so that the regenerative operation ends in step S09, the process returns to step S01.

If the charge / discharge control circuit 40 is No in step S05, the flow advances to step S09. When the regenerative operation ends in step S09, the control returns to step S01.

The important point in the charging operation during the regenerative operation of the elevator of the present embodiment is that the regenerative power generated during the regenerative operation of the elevator is accumulated and distributed in the battery and the supercapacitor, so that the battery among the electric power charged in the battery in the transient period during the regenerative operation Part of the transient power above the rated voltage (or rated current) is to be charged to the capacitor, and the normal regenerative power after this transient period is to be charged by the battery. It can prevent the deterioration and extend the life of the battery.

Next, if it is determined as No in step S03, the charge / discharge control circuit 40 determines that the elevator is in reverse operation in step S10. First, in step S11, the terminal voltage Vuc across the supercapacitor 31 and When the terminal voltage Vuc across the supercapacitor 31 is greater than the minimum discharge voltage Vuc_min (Yes in step S11) by comparing the minimum discharge voltage Vuc_min, the charge / discharge control circuit 40 determines the supercapacitor 31. ) Is determined to be charged with electric power that can be discharged, and the electric power charged in the supercapacitor 31 is discharged in step S12. Next, the charge / discharge control circuit 40 again compares the terminal voltage Vuc at both ends of the supercapacitor 31 with the minimum discharge voltage Vuc_min at step S14 to compare the terminal voltage Vuc at both ends of the supercapacitor 31. ) Is equal to or smaller than the minimum discharge voltage Vuc_min (Yes in step S13), the charging power in the supercapacitor 31 is discharged, and the flow proceeds to step S21 where the voltage Vb across the battery 21 and the battery ( The minimum discharge voltage Vb_Min of 21 is compared, and if the voltage Vb across the battery 21 is larger than the minimum discharge voltage Vb_Min of the battery 21 (Yes in step S21), the charge / discharge control circuit 40 Determines that the battery 21 is capable of being discharged, and discharges the electric charge charged in the battery 21 in step S22.

If YES in step S13, or No in step S21, the process of waiting for the reverse operation is waited for in step S14, and when the reverse operation ends, the process returns to step S01.

An important point in the discharge operation of the present embodiment is that the charge / discharge control circuit 40 discharges the charging power of the supercapacitor 31 first and then discharges the charging power of the battery 21 during the driving operation of the elevator. This is to control, in order to allow the supercapacitor 31 to absorb the transient power in the transient period of the regenerative operation described above, so that the supercapacitor 31 does not maintain the fully charged state for as long as possible.

Next, if it is determined in step S01 that BKM is not 1 (No in step S01), that is, the elevator is in a stopped state, the process proceeds to A. A is an operation in which the charge / discharge control circuit 40 controls the battery 21 to recharge the charging power charged in the supercapacitor 31 during the stop of the elevator.

Next, the operation of A, that is, the operation of controlling the charge / discharge control circuit 40 to recharge the battery 21 with the charging power charged in the supercapacitor 31 during the stop of the elevator is shown in FIG. It demonstrates, referring a flowchart.

When it is determined as No in step S01 of FIG. 4A, the charge / discharge control circuit 40 determines that the elevator is stopped, and the battery 21 charges the electric power charged in the supercapacitor 31 during the regenerative operation of the elevator. In order to recharge, first, in step S31, the voltage Vuc across the supercapacitor 31 and the minimum discharge voltage Vuc_min are compared, and the voltage Vuc across the supercapacitor 31 is the minimum discharge voltage Vuc_min. If larger (Yes in step S31), the voltage Vb across the battery 21 is compared with the maximum charging voltage Vb_max of the battery 21 in step S32. If the voltage Vb across the battery 21 is less than the maximum charging voltage Vb_max of the battery 21 (Yes in step S32), the charge / discharge control circuit 40 may change the charging power of the supercapacitor 31. It is determined that the battery 21 can be recharged, and the charge / discharge control circuit 40 controls the supercapacitor charge / discharge circuit 32 to recharge the charging power of the supercapacitor 31 to the battery 21 in step S33. The battery charge / discharge circuits 22 are respectively controlled to recharge the charging power of the supercapacitor 31 to the battery 21.

If it is determined to be No in step S31 or step S33, the charge / discharge control circuit 40 proceeds to step S34 to end the recharging operation and returns to step S01 in Fig. 4A.

As such, the reason for recharging the charging power of the supercapacitor 31 to the battery 21 when the elevator is stopped is that the supercapacitor 31 absorbs the transient power during the transient period of the regenerative operation described above. It is preferable that the capacitor 31 be in a state where it can be charged at any time without maintaining the state of full charge as long as possible, which is a very important part in the charge / discharge control of the present invention.

This concludes the description of the preferred embodiment of the present invention.

For reference, in the present embodiment, the case where the passenger 5 near the full car rides on the elevator 5, or the vehicle 5 5 when the elevator descends near the empty state is referred to as "reverse driving (力 行). Iii) "and the case where the passenger 5 near the full car enters the car 5 of an elevator, or the case where the car 5 of the elevator rises in the state near empty is" regeneration operation ". As described above, this is only one, and the regenerative operation and the retrograde operation in the present invention may be assumed to be the reverse cases, respectively.

In addition, in the description of the discharge operation during the retrograde operation of the elevator in the description of Fig. 4A, the charging power of the supercapacitor 31 is first discharged by step S11, and the charging power of the supercapacitor 31 is all discharged. Since the charging power of the battery 21 is controlled after discharge, the charging power of the battery 21 may be controlled to discharge the charging power of the supercapacitor 31 and the discharge power of the battery 21 simultaneously.

In addition, at a certain time before all of the charging power of the supercapacitor 31 is discharged, for example, the charging power of the supercapacitor 31 is a part of the charging power at the full charge, for example, 1/2 or 1/3. At this point of time, the discharge of the charging power of the supercapacitor 31 is terminated and the charging power of the battery 21 is discharged, or when the part of the charging power of the supercapacitor 31 is discharged, the supercapacitor ( 31 may be controlled to discharge the electric power charged in the battery 21 at the same time.

In addition, in the descriptions of FIGS. 4A and 4B regarding the charge control and the discharge control of the battery 21 and the supercapacitor 31, the voltages between the battery 21 and the supercapacitor 31 and the maximum charging voltage or Although the charging degree is controlled by controlling the discharge using the relationship with the discharge minimum voltage, the present invention is not limited thereto. For example, the battery 21 and the supercapacitor (detected by the current detectors 24 and 34) ( The charging or discharging may be controlled by comparing the charging current of 31) with the preset maximum charging current or minimum discharge current.

1 3-phase AC power
2 electric motor
3 winches
6 balance weight
7 encoder
8 controller
9 converter
10 capacitors
11, 24, 34 Current Detector
12 inverter
13 Inverter Control Circuit
14 Inverter Drive Circuit
15 Regenerative Resistance
16 switching means
21 batteries
22 Battery charge and discharge circuit
31 Supercapacitors
32 Supercapacitor charge / discharge circuit
40 charge / discharge control circuit

Claims (8)

A converter that rectifies AC power and converts it into DC power, an inverter that converts the DC power into an AC power having a variable voltage and a variable frequency, and a controller that operates an elevator by controlling an electric motor by the AC power having the variable voltage and a variable frequency. With elevator control device provided,
A battery for charging power or discharging the charged power according to an operation state of the elevator;
A supercapacitor for charging or discharging electric power according to an operation state of the elevator;
A battery charge / discharge circuit for charging power to the battery or discharging power charged to the battery;
A supercapacitor charge / discharge circuit for charging electric power to the supercapacitor or discharging electric power charged to the supercapacitor;
A charge / discharge control circuit for controlling the battery charge / discharge circuit and the supercapacitor charge / discharge circuit;
The charging and discharging control circuit is an elevator control apparatus characterized in that the control to charge the regenerative power to the battery and the supercapacitor when the elevator performs the regenerative operation. The method according to claim 1,
The charging and discharging control circuit is an elevator control apparatus, characterized in that for controlling the discharge to the electric power charged in the battery and the supercapacitor when the elevator is in reverse operation. The method according to claim 2,
And the charge and discharge control circuit controls the electric power charged in the supercapacitor to be discharged prior to the discharge of the electric power charged in the battery. A converter that rectifies AC power and converts it into DC power, an inverter that converts the DC power into an AC power having a variable voltage and a variable frequency, and a controller that operates an elevator by controlling an electric motor by the AC power having the variable voltage and a variable frequency. With elevator control device provided,
A battery for charging power or discharging the charged power according to an operation state of the elevator;
A supercapacitor for charging or discharging electric power according to an operation state of the elevator;
A battery charge / discharge circuit for charging power to the battery or discharging power charged to the battery;
A supercapacitor charge / discharge circuit for charging electric power to the supercapacitor or discharging electric power charged to the supercapacitor;
A charge / discharge control circuit for controlling the battery charge / discharge circuit and the supercapacitor charge / discharge circuit;
And said charge / discharge control circuit controls to recharge the battery with electric power charged in said supercapacitor when said elevator is stopped. A converter that rectifies AC power and converts it into DC power, an inverter that converts the DC power into an AC power having a variable voltage and a variable frequency, and a controller that operates an elevator by controlling an electric motor by the AC power having the variable voltage and a variable frequency. Elevator control method in the elevator control device provided,
The elevator control device includes a battery and a supercapacitor for charging power or discharging the charged power according to the operation state of the elevator,
An operation state monitoring step of monitoring an operation state of the elevator;
And a charging step of charging the regenerative power to the battery and the supercapacitor if the elevator is determined to be in regenerative operation in the operation state monitoring step. The method according to claim 5,
And a discharging step of discharging electric power charged in the battery and the supercapacitor if it is determined that the elevator is in the retrograde operation in the operation state monitoring step. The method of claim 6,
In the discharging step, the elevator control method characterized in that for discharging the power charged in the supercapacitor prior to the discharge of the power charged in the battery. A converter that rectifies AC power and converts it into DC power, an inverter that converts the DC power into an AC power having a variable voltage and a variable frequency, and a controller that operates an elevator by controlling an electric motor by the AC power having the variable voltage and a variable frequency. Elevator control method in the elevator control device provided,
The elevator control device includes a battery and a supercapacitor for charging power or discharging the charged power according to the operation state of the elevator,
An operation state monitoring step of monitoring an operation state of the elevator;
And a recharging step of recharging the electric power charged in the supercapacitor to the battery when it is determined that the elevator is stopped in the operation state monitoring step.

Images