JP2002211855A - Control system for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control system for an elevator that effectively uses electric energy accumulated in a power accumulator in the event of a service interruption by changing an operation mode while monitoring the residual of the power accumulator. SOLUTION: The control system for an elevator comprises a converter for rectifying alternating-current power from an alternating-current power source to convert it into direct-current power, an inverter for converting the direct-current power from the converter into alternating-current power of a variable voltage and frequency and driving an electric motor to operate an elevator, the power accumulator interposed in a direct-current bus between the converter and the inverter to accumulate the direct-current power from the direct-current bus during a regenerative operation of the elevator and to supply the accumulated direct-current power to the direct-current bus during a power running operation, a charging/discharging controlling circuit for controlling the charging/discharging of the power accumulator relative to the direct- current bus, a charging/discharging state measuring circuit for measuring the charging/ discharging state of the power accumulator, and a controlling means for changing an operation mode during an operation under a service interruption from the alternating-current power source according to the output of the measuring circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy-saving elevator control apparatus using a secondary battery.

[0002]

2. Description of the Related Art FIG. 4 is a basic block diagram of a control device for controlling an elevator using a conventional secondary battery. In FIG. 4, reference numeral 1 denotes a three-phase AC power supply, and 2 denotes a converter including a diode for converting AC power output from the three-phase AC power supply 1 into DC power. It is supplied to the bus 3. Reference numeral 4 denotes an inverter controlled by a speed control device (described later) for controlling the speed and position of the elevator. The inverter 4 converts a direct current supplied through the direct current bus 3 into an alternating current having a desired variable voltage and variable frequency to generate an alternating current (not shown). By supplying, by rotating the elevator hoisting machine 5 directly connected to the AC motor, the rope wound around the hoisting machine 5 controls the car room and the counterweight connected to both ends thereof to ascend and descend. The passengers in the cabin are moved to a predetermined floor.

Here, the weight of the cab and the counterweight is designed to be substantially the same when half of the passengers enter the cab. That is, when the cab is raised and lowered with no load, when the cab is lowered, the power running operation is performed, and when the cab is raised, the regenerative operation is performed. Conversely, when the cab is lowered with the capacity being taken, regenerative operation is performed when the cab is lowered, and power running operation is performed when the cab is raised.

Reference numeral 6 denotes an elevator control circuit composed of a microcomputer or the like, which manages and controls the entire elevator. 7 is a speed control device for controlling the speed of the elevator, 8 is a charge / discharge control circuit, 9 is provided between the DC buses 3 and accumulates electric power during the regenerative operation of the elevator. A power storage device for supplying the power stored together with the regenerative control circuit,
Reference numerals 1 and 12 denote a regenerative control gate and a regenerative resistor connected between the DC buses, 13 denotes a bus voltage measuring device for measuring the bus voltage of the DC bus 3, and 14 denotes a charging / discharging state for measuring the charging / discharging state of the power storage device 9. A charge / discharge control circuit 8
Controls the charging and discharging of the power storage device 9 based on the measured values from the bus voltage measuring device 14 and the measured values from the charging and discharging state measuring circuit 14.

Here, the power storage device 9 is generally composed of a secondary battery and a DC-DC converter for controlling charging and discharging of the secondary battery, and the DC-DC converter is connected via a charge gate and a discharge gate. The charge and discharge are controlled, and the gates are controlled by the charge and discharge control circuit 8. Generally, the number of secondary batteries is reduced to make the device compact and inexpensive, and the output voltage of the batteries is lower than the voltage of the DC bus 3. The voltage of the DC bus 3 is basically controlled around a voltage Vp obtained by rectifying the voltage of the three-phase AC power supply 1. Therefore, when charging the battery, it is necessary to lower the bus voltage by setting the input voltage of the power storage device 9 to a value lower than the voltage Vp, and to raise and lower the output voltage of the power storage device 9 to a value higher than the voltage Vp during discharging. And therefore D
A C-DC converter is employed.

FIG. 5 is a flowchart showing the control of the charge / discharge control circuit 8 at the time of discharging. As the control system, a more stable control in which a current control minor loop or the like is configured for the voltage control may be used. However, for simplicity, a method in which control is performed using a bus voltage will be described.

First, for example, a bus voltage is measured by a bus voltage measuring device 1.
3 is measured (step S11). The measured voltage is compared with a desired voltage set value, and it is determined whether or not the measured voltage exceeds the voltage set value (step S12). It is determined whether or not the measurement value of the discharge current of the secondary battery by the measurement circuit 14 has exceeded a predetermined value (step S13).

According to these determinations, when the measured voltage exceeds the set value, or when the measured value of the discharge current of the secondary battery exceeds the predetermined value even when the measured voltage does not exceed the set value, the discharge is performed. In order to shorten the ON pulse width of the gate, a new gate O is obtained by subtracting the adjustment time DT from the current ON time.
N time is obtained (step S14).

On the other hand, when it is determined in step S13 that the measured value of the discharge current of the secondary battery does not exceed the predetermined value, the current ON time is increased to increase the ON pulse width of the discharge gate. On the other hand, a new gate ON time is obtained by adding the adjustment time DT (step S15). The discharge gate ON control is performed based on the gate ON time obtained in this way, and the obtained gate ON time is stored in the internal memory as the current ON time (step S16).

As described above, by increasing the ON pulse width of the discharge gate, the average voltage, which is the output voltage of the power storage device 9, is increased, and more current flows from the secondary battery to the bus. The supply power is increased, and the bus voltage of the DC bus 3 is increased by the power supply. Considering the operation during power running, the elevator needs electric power supply, and this electric power is provided by discharging from the secondary battery and supplying from the three-phase AC power supply 1. When the bus voltage is controlled to be higher than the output voltage of converter 2 supplied from three-phase AC power supply 1, all power is supplied from the secondary battery. However, in order to configure an inexpensive power storage device, it is designed not to supply all power from the secondary battery, but to supply the power from the secondary battery and the three-phase AC power supply 1 at an appropriate ratio. I have.

That is, in FIG. 5, the measured value of the discharge current is compared with a supply sharing current (predetermined value). If the measured value exceeds the predetermined value, the ON pulse width of the discharge gate is lengthened and the supply amount is further increased. However, if the measured value of the discharge current does not exceed the predetermined value, the ON pulse width of the discharge gate is shortened, and as a result, the power supply is clipped by this repetition. In this way, of the power required by the inverter 4, the portion supplied from the secondary battery is clipped, so that the bus voltage of the DC bus 3 becomes low, and as a result, the supply from the converter 2 is started. . Since these occur in a very short time, in practice, in order to supply the required power of the elevator, it is necessary to settle down to an appropriate bus voltage and to supply power at a desired ratio from the secondary battery and the three-phase AC power supply 1. It becomes possible.

Next, a flow chart at the time of charge control shown in FIG. 6 will be described. When there is power regeneration from an AC motor (not shown) that rotationally drives the hoisting machine 5, the bus voltage of the DC bus 3 rises due to the regenerated power. When this voltage becomes higher than the output voltage of converter 2, power supply from three-phase AC power supply 1 stops. It is publicly known that this state will continue when the power storage device 9 is not present. Therefore, although not shown, the voltage of the DC bus 3 rises.
When the measured voltage value of the bus voltage reaches a certain voltage,
The regenerative control circuit 10 operates to close the regenerative control gate 11 composed of a switching element or a contactor.
As a result, electric power is supplied to the regenerative resistor 12, the regenerative electric power is consumed by the resistor, and the elevator is decelerated by the electromagnetic braking effect. However, when the power storage device 9 is provided, the regenerative power is charged to the power storage device 9 by the control of the charge / discharge control circuit 8 before the power is increased to a voltage at which power flows through the regenerative resistor 12.

That is, as shown in FIG. 6, if the measured value of the bus voltage of the DC bus 3 by the bus voltage measuring device 13 exceeds a predetermined voltage, the charge / discharge control circuit 8 detects that the vehicle is in the regenerative state. Then, by increasing the ON pulse width of the charging gate, the charging current to the secondary battery is increased (steps S21 → S22 → S23). Eventually, when the regenerative power from the elevator decreases, the DC bus 3
Also decreases, and the measured value of the bus voltage measuring device 13 does not exceed the predetermined voltage. Therefore, the ON pulse width of the charging gate is controlled to be short, and the charging power is also controlled to be small (step S2).
1 → S22 → S24).

As described above, by monitoring the bus voltage of the DC bus 3 and controlling the charging power, the bus voltage is controlled to an appropriate range and charging is performed. In addition, by accumulating and reusing power that was conventionally consumed by regenerative power,
Energy saving is realized. As described above, the current / voltage of charging / discharging of the power storage device 9 is always controlled by the DC-DC converter, and the difference between the total amount of charged power and the total amount of discharged power is the current power storage device 9 Is the remaining power storage amount.

Generally, an amount indicating the degree of charge to the power storage device 9 is referred to as SOC (state of charge).
This state of charge SOC is calculated from the difference between the amount of power charged and the amount of discharged power as described above. In addition, when the three-phase commercial power supply 1 fails, the elevator can be operated by supplying power from the power storage device 9. However, for this operation, it is necessary to operate at a reduced speed due to the limitation of the power that can be output from the power storage device 9. Further, at the time of a power failure, the amount of power W stored in the power storage
h determines how long (distance) operation is possible.

[0016]

However, in the above-described conventional elevator control device, it is necessary to use the remaining power amount of the power storage device 9 effectively and without waste when the commercial power supply is interrupted. During a power outage,
If all hall calls continue to be accepted, there is a problem that the power storage device 9 runs out of power and the vehicle cannot travel before moving to the destination floor of the passenger who has boarded the car.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and when a power failure of a commercial AC power supply is detected, proper operation can be performed while monitoring the remaining amount of the power storage device. It is an object of the present invention to obtain an elevator control device capable of changing the operation mode so as to make effective use of the electric energy stored in the power storage device.

[0018]

SUMMARY OF THE INVENTION An elevator control apparatus according to the present invention comprises a converter for rectifying AC power from an AC power supply and converting the AC power to DC power, and an AC power supply for converting the DC power from the converter to a variable voltage variable frequency. An inverter that converts electric power to drive an electric motor to drive an elevator, and is provided between a DC bus between the converter and the inverter, stores DC power from the DC bus during a regenerative operation of the elevator, and performs a power running operation. A power storage device that supplies the DC power stored at the time to the DC bus, a charge / discharge control circuit that controls charging / discharging of the power storage device with respect to the DC bus, and a charge / discharge that measures a charge / discharge state of the power storage device A state measuring circuit; and control means for changing an operation mode in the power failure operation of the AC power supply according to an output of the measuring circuit. It is an.

Further, the control means has an operation mode in which a hall call is accepted, and restricts the operation mode in which a hall call is accepted when a value measured by the charge / discharge state measurement circuit is equal to or less than a set value. It is characterized by the following.

Further, the control means has an operation mode corresponding to only a special call such as wheelchair driving, and accepts only the special call when the value measured by the charge / discharge state measurement circuit is equal to or less than a set value. It is characterized by the following.

Further, the control means has an operation mode in which a hall call is received and an operation mode corresponding to only a special call such as a wheelchair operation, and a value measured by the charge / discharge state measurement circuit is a first set value. As described above, when the value is equal to or less than the second set value higher than the first set value, only the special call is accepted. It is a feature.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, when a commercial AC power supply fails, the elevator is operated solely by supplying power from a power storage device. At this time, if the state of charge SOC of the power storage device has a margin, the operation is continued in response to the hall call, and if the state of charge SOC is running low, the hall call is limited and the state of charge is limited. Just bring the passengers on the elevator to the desired destination floor,
By preventing new passengers from being accepted, it is possible to prevent the power supply from being unable to supply power from the power storage device during operation of the elevator. In other words, if the state of charge of the power storage device is running low during a commercial AC power outage, if the hall call remains valid, the elevator will operate due to insufficient power remaining in the power storage device with passengers on board. Since there is a problem that the power storage device cannot be stopped, the hall call is controlled while checking the remaining amount of the power storage device so that a new passenger cannot be loaded.

FIG. 1 is a block diagram showing a configuration of an elevator control device according to the present invention. The same parts as those of the conventional example shown in FIG. As a new code, 15 is a hall call button device, 16 is a power failure detector for detecting a power failure of the three-phase AC power supply 1, and an elevator control circuit 6A as control means according to the present invention includes a charge / discharge state measurement circuit 14 The operation mode in the power failure operation of the three-phase AC power supply 1 is changed according to the output of the power supply.

Embodiment 1 FIG. 2 is a flowchart showing control by elevator control circuit 6A according to Embodiment 1 of the present invention. In the first embodiment, the elevator control circuit 6A has operation modes with and without a hall call reception, and when the value measured by the charge / discharge state measurement circuit 14 is equal to or less than a set value, the elevator control circuit 6A determines that the hall call has been received. Restrict the operation mode.

That is, FIG. 2 shows the remaining call amount of the power storage device 9, that is, the hall call button device 15 according to the state of charge SOC.
5 is a flowchart for controlling the reception of the hall call registered in the step (a), in which the reception is performed according to the remaining power of the power storage device 9. In general, the remaining power is calculated assuming that the full charge of the power storage device 9 is 100% and the total discharge is 0%. Generally, it is used in an intermediate region where the remaining power is about 80% to 30%. That is, the remaining power is gradually used at the time of the power failure, and there is a difference depending on the use of the elevator. For example, when the remaining power becomes about 40%, the power that can be supplied from the power storage device 9 in the future is It is considered that the amount has decreased, and no further landing calls will be accepted. That is, while responding to a car call of a passenger who is already in the car,
In order to prevent passengers from getting on, the passengers do not respond and the elevator stops when there are no more passengers in the car.

More specifically, the elevator control circuit 6A
Based on the power failure detection signal from the power failure detector 16, the operation at the time of power failure is started according to the flowchart shown in FIG.
First, the charge state SOC measured by the charge / discharge state measurement circuit 14 (the remaining power amount of the power storage device 9), that is, the full charge state of the power storage device 9 is used as a reference, and the charge / discharge state measurement circuit 14 is not illustrated. The value obtained by normalizing and accumulating the product of the charge / discharge current and the charge / discharge voltage of the secondary battery in the power storage device 9 by the voltage detector and the current detector with the power capacity of the power storage device 9 is a first set value (remaining power). When the amount exceeds 40%), the hall call from the hall call button device 15 is accepted, and the normal operation mode with the hall call is performed (step S).
101, S102).

On the other hand, if the measured value of the state of charge SOC by the charge / discharge state measuring circuit 14 does not exceed the first set value, the car responds to the car call of the passenger who is already in the car, If there is no call, it does not respond to the hall call, turns off the lights in the car, closes the door, and sets the door close standby mode (steps S103 to S105).

Therefore, according to the first embodiment,
If a power failure of the commercial AC power supply is detected, the operation mode is changed so that proper operation is possible while monitoring the remaining amount of the power storage device. Can be prevented from being interrupted halfway due to insufficient power remaining in the power storage device 9, and the power stored in the power storage device can be effectively used.

Embodiment 2 The second embodiment has a configuration similar to that of the first embodiment shown in FIG. 1, and the elevator control circuit 6A has a driving mode that responds to all hall calls and a driving mode that supports only special calls such as wheelchair driving. And a value measured by the charge / discharge state measurement circuit 14 is the first
If the value is not less than the second set value and not more than the second set value higher than the first set value, only the special call is accepted.

That is, when the remaining power amount of the power storage device 9 becomes small, the general hall call response is terminated.
The same as the first embodiment, but in the second embodiment,
Even in such a case, a special call is accepted. Here, the special call is a handicapped call (wheelchair call), VIP
This is a call necessary for handling the weak or for management, such as a call or a special call such as a main floor call by an attendant.

In this case, in the case of the previous example, when the SOC decreases to, for example, about 45%, the mode is set to accept only this special call. By doing so, it is possible to switch to this mode with a little margin left compared to Embodiment 1, and to continue driving, for example, a disabled person who needs an elevator.

FIG. 3 is a flowchart showing control by elevator control circuit 6A according to Embodiment 2 of the present invention. As shown in FIG. 3, when the measured value of the state of charge SOC by the charge / discharge state measurement circuit 14 exceeds a second set value (the remaining power amount is 45%) at the time of a power failure, the first embodiment is used.
Similarly to the above, the hall call from the hall call button device 15 is accepted, and the normal operation mode with the hall call is performed (steps S201 and S202). In other words, only when the measured SOC value exceeds the second set value (the remaining power amount is 45%), the normal operation mode with a hall call is performed.

On the other hand, even if the measured value of the state of charge SOC by the charge / discharge state measuring circuit 14 does not exceed the second set value, it is equal to or more than the first set value (the remaining power amount is 40%). A special call is received and executed (step S201 → S2
03), if it does not exceed the first set value (the remaining power amount is 40%), as in the first embodiment, it responds to the car call of the passenger who is already in the car, but the car If there is no call, it does not respond to the hall call, turns off the lights in the car, closes the door, and sets the door-close standby mode (steps S204 to S204).
207).

Therefore, according to the second embodiment,
An operation mode that responds only to special calls such as wheelchair operation when a power failure of the commercial AC power supply is detected.The operation mode enables proper operation while monitoring the remaining amount of the power storage device. Therefore, the amount of power stored in the power storage device can be effectively used, and a service can be provided to a passenger who needs to operate an elevator such as a disabled person.

[0035]

As described above, according to the present invention, the charging / discharging state of the power storage device is changed according to the measurement result in the operation mode during the power failure operation of the AC power supply. The stored electric energy can be used effectively.

When the measured value of the charging / discharging state of the power storage device is equal to or less than the set value, the operation mode in which the hall call is accepted is limited, so that the amount of power stored in the power storage device is effective. Can be used for

Further, when the measured value of the charge / discharge state of the power storage device is equal to or less than the set value, only special calls are accepted, so that it is possible to provide services to passengers who need to operate elevators such as disabled persons. Can be.

Further, when the measured value of the charge / discharge state of the power storage device is equal to or more than the first set value and equal to or less than the second set value higher than the first set value, only the special call is accepted, If it is larger than the set value, the system responds to all hall calls, so that the amount of power stored in the power storage device can be used effectively, and especially for passengers who need to operate elevators such as disabled persons. Services can be enabled.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an elevator control device according to the present invention.

FIG. 2 is a flowchart showing a control operation of the elevator control circuit according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing a control operation of an elevator control circuit according to Embodiment 2 of the present invention.

FIG. 4 is a block diagram showing a configuration of an elevator control device according to a conventional example.

FIG. 5 is a flowchart showing control at the time of discharging of a charge / discharge control circuit 8 shown in FIG. 4;

FIG. 6 is a flowchart showing control during charging of the charge / discharge control circuit 8 shown in FIG. 4;

[Description of Signs] 1 Three-phase AC power supply, 2 converter, 3 DC bus, 4
Inverter, 5 hoisting machine, 6, 6A elevator control circuit, 8 charge / discharge control circuit, 9 power storage device, 14
Charge / discharge state measurement circuit, 15 hall call button device, 16 power failure detector.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F304 CA05 EB02 EC04 EC06 5G003 AA01 AA07 BA01 CA01 CA06 CA11 DA05 DA13 GB03 GB06 5G015 FA04 GA07 HA18 JA32 JA34 JA35 JA53 JA55

Claims (4)

[Claims] 1. A converter for rectifying AC power from an AC power supply and converting it to DC power, and an inverter for converting the DC power from the converter to AC power of a variable voltage and variable frequency to drive an electric motor and operate an elevator. Power storage provided between the converter and the inverter between the DC bus, for storing DC power from the DC bus during regenerative operation of the elevator, and supplying the stored DC power to the DC bus during power running operation A charging / discharging control circuit for controlling charging / discharging of the power storage device with respect to the DC bus; a charging / discharging state measuring circuit for measuring a charging / discharging state of the power storage device; A control device for changing an operation mode in a power failure operation of an AC power supply, the control device changing an operation mode. 2. The elevator control device according to claim 1, wherein the control means has an operation mode in which a hall call is received, and the control unit determines whether a value measured by the charge / discharge state measurement circuit is equal to or less than a set value. An elevator control device for limiting an operation mode in which a hall call is accepted. 3. The elevator control device according to claim 1, wherein the control means has an operation mode corresponding to only a special call such as a wheelchair operation, and a measurement value set by the charge / discharge state measurement circuit is set. An elevator control device characterized by accepting only special calls when the value is equal to or less than the value. 4. The elevator control device according to claim 1, wherein the control means has an operation mode in which a hall call is accepted and an operation mode corresponding to only a special call such as wheelchair operation. When the value measured by the state measurement circuit is equal to or more than the first set value and equal to or less than the second set value higher than the first set value, only the special call is accepted. An elevator control device for selecting an operation mode that responds to all of the above.