JP2014009041A - Elevator control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator control device, preventing any increase in size and cost.SOLUTION: An elevator control device includes a plurality of elevator control devices C, D respectively including: regenerative converters 4a, 4b for conducting the power supply regenerative control; inverters 7a,7b connected to the output side of the regenerative converters 4a, 4b to drive hoists of cars 17a, 17b; batteries 9a, 9b for supplying the electric power required for performing the rescue operation when power failure is caused in the cars 17a, 17b; and means 19a, 19b for obtaining positional information and load information of the cars 17a, 17b. Further, the control device includes: a regenerative resistance 12 for consuming the regenerative electric power generated in electric motors 8a, 8b of hoists in the regenerative mode during the rescue operation in the case of power failure; a regenerative control means 13 to which the electric power of any of the battery 9a or 9b is supplied to perform continuity and interception of the regenerative resistance 12; and a switching means 24, one end of which is connected to the regenerative resistance 12, and the other end of which is connected to the output side of the regenerative converts 4a, 4b selected by the regenerative control means 13.

Description

  The present invention relates to an elevator control device, and more particularly to an elevator control device that performs a rescue operation during a power failure.

Conventionally, the elevator control apparatus provided with the rescue operation function at the time of a power failure is known as shown in FIG.
The elevator control device 100 shown in FIG. 5 is composed of a main control device A and a power failure rescue operation device B that performs rescue operation control during a power failure, and is configured to perform a power failure rescue operation on the main control device A side. It is a control device. In this conventional elevator control device 100, the main control device A side is a three-phase AC power source 1, a no-fuse breaker 2, a main circuit AC contactor 3 that is input when a starting condition is established in the elevator during normal operation, A power supply side converter device 4 that performs boost control and power supply regeneration control during normal operation, a DC smoothing capacitor 5 provided in the DC main circuit to smooth the output voltage of the power supply side converter device 4, and a voltage of the DC main circuit And an inverter device 7 that reconverts the DC power of the DC main circuit into desired AC power and outputs the same, and the induction motor 8 is driven by the output of the inverter device 7. It is configured.

  Moreover, the rescue operation apparatus B side at the time of a power failure starts the storage battery 9 which supplies electric power to the main control apparatus A at the time of a power failure, the rectifier 10 which prevents that an overvoltage is applied to this storage battery 9, and the rescue operation at the time of a power failure. A main contact driven by a DC main circuit contactor 11 that is sometimes turned on and supplies the power of the storage battery 9 to the main controller A side, a regenerative resistor 12 that consumes regenerative energy during a rescue operation during a power failure, and the regenerative resistor 12 The semiconductor switch 13 performs regenerative control that consumes regenerative energy. Here, the rescue operation during a power failure is generally performed in a regenerative mode for the purpose of suppressing the discharge of the storage battery 9 as much as possible.

  In FIG. 5, reference numeral 14 denotes a sheave rotated by the induction motor 8, reference numeral 15 denotes a hoisting rope wound around the sheave 14, reference numeral 16 denotes a counterweight attached to one end of the hoisting rope 15, and reference numeral Reference numeral 17 denotes a car attached to the other end of the hoisting rope 15, and reference numeral 18 denotes a load detection device provided on the car 17.

  In the conventional elevator control device 100 configured as described above, in the normal operation mode, the main circuit AC contactor 3 is turned on when the elevator start condition is satisfied, and the converter device 4 outputs the output voltage of the DC voltage detector 6. Boosting and constant voltage control are performed while monitoring, and power is supplied from the three-phase AC power source 1 side to the induction motor 8 via the inverter device 7 during power running operation, and from the induction motor 8 side via the converter device 4 during regenerative operation. The power is returned to the three-phase AC power source 1 side.

  Then, during the rescue operation during a power failure, the rescue operation command is turned on, the DC main circuit contactor 11 is excited through a control circuit (not shown), and its main contact is turned on.

  Therefore, when the car 17 is present in the door zone of the rescueable area, the rescue operation is performed to the landing level as it is even in the powering mode. However, if the car 17 is stopped outside the door zone at the time of a power failure, the rescue operation is performed in the operation direction in which the regeneration mode is set.

  In the rescue operation in the regenerative mode, the regenerative energy is charged in the smoothing capacitor 5 and the DC voltage rises. At this time, the output of the DC voltage detector 6 is set to a voltage higher than the voltage of the storage battery 9 in advance. If the voltage becomes higher than the reference voltage signal, the semiconductor switch 13 is turned on, and the regenerative energy is consumed by the regenerative resistor 12.

  As described above, the rescue operation during a power failure is generally performed in the regenerative mode for the purpose of suppressing the discharge of the storage battery 9 as much as possible. However, the conventional elevator control device 100 includes the semiconductor switch 13 for guiding the regenerative current to the regenerative resistor 12 that absorbs the regenerative energy on the rescue operation device B side at the time of a power failure. The switch 13 must also be a large switch, and a drive circuit for the semiconductor switch 13 must be provided separately. This increases the size of the apparatus and increases the cost.

  Therefore, an elevator control device that solves this problem is disclosed in Japanese Patent Laid-Open No. 06-345350 (Patent Document 1).

Japanese Patent Laid-Open No. 06-345350

  In the above-mentioned Patent Document 1, in an elevator control device that performs a power failure rescue operation by a main controller having a converter device that performs power regeneration, when performing a power failure rescue operation in the power running mode, direct current power is supplied from the storage battery to the main controller. A technique is disclosed in which when an induction motor is supplied to drive a rescue operation during a power failure in a regeneration mode, the regenerative power of the induction motor is guided to a regenerative resistor via a semiconductor switching element of a converter device.

  According to the technique disclosed in Patent Document 1, the semiconductor switch element for turning on and off the regenerative resistor can be shared with the semiconductor switch element of the converter device, and the number of parts can be reduced. However, the number of regenerative resistors that consume the regenerative power generated in the regenerative mode of the rescue operation during a power failure cannot be reduced, and in the case of a high-speed elevator, the regenerative resistor increases and the capacity of the semiconductor switch element accordingly. It is necessary to select a large one.

  Moreover, it is necessary to provide a rescue operation device at the time of a power failure in each elevator, and when it is configured by a plurality of elevators, it is necessary to install a plurality of rescue operation devices at the time of a power failure that are large in size.

  Thus, in the case of an elevator capable of high speed travel, the regenerative power during a power failure operation increases, and therefore it is necessary to provide a large resistance device and a large capacity semiconductor switch element in the rescue operation device during a power failure.

  Further, providing each control device with a resistance device for processing regenerative power requires a lot of cost and installation area, and there are many demerits on the equipment side.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide an elevator control device in which the device is not increased in size and cost.

  The elevator apparatus according to the present invention is necessary for each of the regenerative converter that performs power regeneration control, the inverter that is connected to the output side of the regenerative converter, and drives the car hoist, and the car performs a rescue operation during a power failure. Consuming regenerative power generated by the hoisting motor in the regenerative mode of the rescue operation at the time of power failure and a plurality of elevator control devices having storage batteries for supplying power and means for obtaining car position information and load information The regenerative resistor, the regenerative control means for supplying and cutting off the regenerative resistor, and one end connected to the regenerative resistor and the other end selected by the regenerative control means. Switching means connected to the output side of the regenerative converter, and the regenerative control means is based on position information / load information from the elevator control device. Select the regenerative converter for controlling, after switching by the switching means, the conduction of the regenerative resistor, and controls the cut-off.

  According to the elevator apparatus of the present invention, the regenerative processing device is not provided in each control device of the elevator, and the auxiliary control device that shares the resistor that consumes the regenerative power is provided with each control device. It is possible to operate at a high speed in the regenerative direction, and to reduce the cost and installation area of the resistance device.

It is a block block diagram explaining the elevator control apparatus by Embodiment 1 of this invention. It is a flowchart explaining operation | movement of the elevator control apparatus by Embodiment 1 of this invention. It is a flowchart explaining operation | movement of the elevator control apparatus by Embodiment 1 of this invention. It is a time chart explaining the operation condition of the elevator control apparatus by Embodiment 1 of this invention. It is a block block diagram explaining the conventional elevator control apparatus.

  A preferred embodiment of an elevator control device according to the present invention will be described below with reference to the drawings. The present invention is not limited to this, and the embodiments can be modified or omitted as appropriate within the scope of the invention.

Embodiment 1 FIG.
FIG. 1 is a block diagram illustrating an elevator control apparatus according to Embodiment 1 of the present invention. In FIG. 1, the elevator control device 200 includes an A-unit main control device C and a B-unit main control device D, and an auxiliary control device E for each of the A-unit main control device C and the B-unit main control device D. . Here, the No. A main controller C and the No. B main controller D are configured in the same manner. Therefore, in the following explanation, the subscripts of the signs of the A-unit main control device C and the B-unit main control device D are classified as a and b, respectively, and the configuration of the A-unit main control device C is explained. The description of the configuration of the device D is omitted.

  The R to T phases of the three-phase AC power source 1a are connected to the input terminal of the converter device 4a through the normally open contacts of the no-fuse circuit breaker 2a and the main circuit AC contactor 3a, respectively. The converter device 4a is composed of elements connected in parallel with a transistor and a diode. A DC smoothing capacitor 5a is connected between the output terminals of the converter device 4a and is connected to an input terminal of the inverter device 7a. Yes. A DC voltage detector 6a is connected between the output terminals of the DC smoothing capacitor 5a.

  The inverter device 7a is also composed of an element in which a diode is connected in parallel to a transistor, and the output terminal of the inverter device 7a is connected to the induction motor 8a via an inductance element (not shown). A sheave 14a is connected to the induction motor 8a. A hoisting rope 15a is wound around the sheave 14a, and a car 17a is attached to one end of the hoisting rope 15a. A counterweight 16a is attached to the other end of the hoisting rope 15a.

  The machine A control circuit 19a is constituted by a microcomputer, and has an interface, ROM, RAM, and CPU as its basic components. The machine A control circuit 19a receives the output of the pulse generator 20a and the output of the load detection device 18a. It is designed to be entered.

  Although not shown, the conduction angle control of the elements of the converter device 4a and the elements of the inverter device 7a is performed by the output of the A-unit control circuit 19a, thereby controlling the VVVF (variable voltage variable frequency) control of the induction motor 8a. To do.

  The pulse generator 20a detects a code plate (not shown) attached to the governor 21a to generate a movement pulse, and the load detection device 18a detects the load in the car 17a. It is supposed to be. Further, a governor rope is attached to the car 17a, and this governor rope is stretched between the governor 21a and the tensioning wheel 22a so as to move as the car 17a travels. Further, a storage battery 9a is connected to the bus on the output side of the converter device 4a, and both positive and negative electrodes of the storage battery 9a are connected to the input terminal of the inverter 7a via the DC main circuit contactor 11a.

  The attached control device E is a device for consuming the regenerative power at the time of a power failure, and operates with the battery power of the Unit A main control device C or the Unit B main control device D as power. An auxiliary device control circuit 23 for calculating a position, a moving distance, and a weight is provided. When performing rescue operation, the switch 24 is connected to the bus on the high-speed operation unit side, and the output of the DC voltage detectors 6a and 6b on the high-speed operation unit side is set to a voltage higher than the voltage of the storage batteries 9a and 9b in advance. If the voltage signal becomes higher than the voltage signal, the semiconductor switch 13 as the regeneration control means is turned on, and the regenerative resistor 12 consumes regenerative energy. In addition, the power switch 25 has a contact for connecting the power supply when the storage batteries 9a, 9b of each unit are depleted, and if the storage battery 9a, 9b is depleted and cannot be rescued during a power failure, It has the function of supplying battery power.

  The elevator control device 100 according to the first embodiment is configured as described above, and the operation thereof will be described next. Since the A-unit main controller C and the B-unit main controller D operate in the same manner, the operation of the A-unit main controller C will be described here, and the description of the operation of the B-unit main controller D will be omitted. To do.

  If the three-phase AC power source 1a is normal, the main circuit AC contactor 3a is closed, and the converter device 4a converts the three-phase AC power into DC power. At this time, the input current waveform is controlled to be substantially a sine wave by known PWM (pulse width modulation). The output voltage of the converter device 4a is smoothed by the DC smoothing capacitor 5a and then applied to the inverter device 7a. The inverter device 7a converts the output voltage into AC power having an arbitrary frequency and an arbitrary voltage. At this time, the inverter device 7a performs PWM control similarly to the converter device 4a.

  In the normal operation mode, when the elevator starting condition is satisfied, the main circuit AC contactor 3a is turned on, and the converter device 4a performs voltage boosting and constant voltage control while monitoring the output voltage of the DC voltage detector 6a. Electric power is supplied from the phase AC power source 1a side to the induction motor 8a via the inverter device 7a, and power is returned from the induction motor 8a side to the three-phase AC power source 1a side via the converter device 4a during regenerative operation. . The output of the inverter device 7a is applied to the induction motor 8a through an inductance element (not shown), and the induction motor 8a is subjected to VVVF control.

  At this time, the brake (not shown) is open, and the induction motor 8a rotates the sheave 14a. Thereby, the hoisting rope 15a is wound up and the car 17a moves. The governor rope moves in accordance with the movement of the car 17a, the governor 21a is rotated via the tensioning wheel 22a, and the pulse generator 20a generates a movement pulse by the code plate attached to the governor 21a. This movement pulse is sent to the No. A machine control circuit 19a. With this movement pulse, the No. A machine control circuit 19a causes the CPU to calculate appropriate acceleration / deceleration commands based on the position of the car 17a and the relative position between the position and the called floor. Based on the calculation result of the CPU, the No. A control circuit 19a generates a control command to the converter device 4a and the inverter device 7a, and controls the conduction angle of the elements constituting the converter device 4a or the inverter device 7a.

  On the other hand, the load by the passenger in the car 17a is detected by the load detection device 18a, and a correction signal is given to the No. A control circuit 19a depending on the number of passengers in the car 17a.

  In such an operating state, when a power failure occurs, the contact of the main circuit AC contactor 3a is opened, and instead, the DC main circuit contactor 11a is closed, and as a result, the voltage of the storage battery 9a is passed through the contact. It is applied to the DC side of the inverter device 7a.

  On the other hand, when the three-phase AC power source 1a is normal, the storage battery 9a is always charged via a charging circuit (not shown). The charged voltage of the storage battery 9a is applied to the DC side of the inverter device 7a as described above at the time of a power failure. The power of the storage battery 9a is converted into three-phase AC power by the inverter device 7a, and the induction motor 8a is driven. The car 17a can be run to the nearest floor to rescue the passengers.

Next, operation | movement of the elevator control apparatus 100 by Embodiment 1 is demonstrated using the flowchart of FIG.2 and FIG.3.
First, in step S1 (hereinafter, “step” is omitted and simply “S” is displayed), when a power failure is detected, the weight of the elevators A and B and the distance to the stop floor are detected in S2.

  Next, in S3, the accessory device control circuit 23 calculates whether the values of the moving distance LA of the A-machine and the moving distance LB of the B-B are larger than the initially set distance (hereinafter referred to as a set distance) L. If both units are larger than the set distance L, the total power amounts PA and PB are calculated from the weight and movement distance of the cage 17a in S4, and the unit having a large amount of power selects high-speed operation in S5. Then, in S6a (S6b), the switch 24 is connected to the bus side of the car that operates at high speed, and in S7a (S7b), the operation is started with battery power. One unit starts low-speed operation with battery power in order to reduce the consumption of regenerative power.

  Thereafter, when the consumption of regenerative power on the high-speed driving traveling side is completed in S8a (S8b) to S13a (S13b), the accessory device control circuit 23 calculates the distance of the other unit again, and if the set distance L is exceeded, 24, the buses are switched and high-speed driving is started.

  In S2, the attached device control circuit 23 calculates whether the value of the moving distance LA of Unit A and the moving distance LB of Unit B is larger than the set distance L. If either the moving distance LA or LB exceeds the set distance L in S3 In S14 to S19, the auxiliary control device E is connected in order to operate the machine exceeding the set distance L at high speed. When LA and LB are both less than the set distance L, both are not connected to the attached control device E and the low speed operation is performed.

  FIG. 4 is a time chart for explaining the operation status of the elevator control apparatus according to the first embodiment, and shows the load power waveform of each unit in the operation mode. In FIG. 4, at time t0, Unit A starts high-speed operation and Unit B starts low-speed operation. It shows that the operation of Unit A ends at time t1, Unit B switches to high speed operation, stops at the rescue floor, and ends the operation.

  As described above, according to the elevator control device according to the first embodiment, the regenerative processing device is not provided in each control device of the elevator, and the attached control device that shares the resistor that consumes regenerative power with each control device is provided. Therefore, the backup battery at the time of power failure enables operation at a high speed in the regenerative direction, and it is possible to reduce the cost and installation area of the resistance device.

1, 1a, 1b Three-phase AC power supply 2, 2a, 2b No-fuse breaker 3, 3a, 3b Main circuit AC contactor 4, 4a, 4b Power supply side converter device 5, 5a, 5b DC smoothing capacitor 6, 6a, 6b DC voltage detectors 7, 7a, 7b Inverter devices 8, 8a, 8b Induction motors 9, 9a, 9b Storage batteries 10, 10a, 10b Rectifiers 11, 11a, 11b DC main circuit contactors 12 Regenerative resistors 13 Semiconductor switches 14, 14a, 14b Sheave 15, 15a, 15b Hoisting rope 16, 16a, 16b Counterweight 17, 17a, 17b Car 18, 18a, 18b Load detector 19a A machine control circuit 19b B machine control circuit 20, 20a, 20b Pulse generator 21, 21a, 21b Governor 22, 22a, 22b Tension wheel 23 Attached device control circuit 24 Switch 2 Power switching device 100, 200 elevator control apparatus A main control unit B power failure rescue operation device C A Unit Main controller D B Unit Main controller E accessory control device

Claims (1)

A regenerative converter that performs power regeneration control, an inverter connected to the output side of the regenerative converter, and drives a car hoist, a storage battery that supplies power necessary for the car to perform a rescue operation during a power failure, and A plurality of elevator control devices having means for obtaining car position information and load information;
A regenerative resistor that consumes regenerative power generated by the motor of the hoisting machine in the regenerative mode of the rescue operation during a power failure; and
Regenerative control means that is supplied with electric power from any of the above storage batteries and that conducts and shuts off the regenerative resistor;
Switching means connected at one end to the regenerative resistor and connected at the other end to the output side of the regenerative converter selected by the regenerative control means;
The regenerative control means selects the regenerative converter that performs regenerative control based on the position information and load information from the elevator control device, and after switching by the switching means, controls regenerative resistance conduction and interruption. An elevator control device characterized by performing.

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