JPS59149286A - Controller for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator control device for reducing the capacity of an emergency generator in an AC variable voltage, variable frequency elevator.

FIG. 1 is a block diagram of a conventional voltage type AC variable voltage variable frequency type elevator. In FIG. 1, reference numeral 1 denotes a three-phase AC power supply, and a power outage is detected by a power outage detection relay 4.

When the 3-phase AC power supply 1 is normal, the power failure detection relay 4 is energized and its normally open contact 4A is closed, and when the 3-phase AC power supply 1 is out of power, the power failure detection relay 4 is demagnetized and its normally open contact 4A is closed. The open contact 4A is opened.

On the other hand, it is a 2-engine diesel engine. When the three-phase AC power supply 1 is out of power, the diesel engine 2 drives the three-phase AC generator 3 to output three-phase AC power through the normally closed contact 4B of the power failure detection relay 4.

It is designed to be supplied to the output converter 5 of the 3-phase AC power supply 1 or the 3-phase AC generator 3.

This power running inverter 5 converts AC power into DC power, and this DC power is smoothed by a DC reactor 8 and a capacitor 9 before being applied to an inverter 10.

The inverter 10 converts this DC power back into AC power and supplies it to the induction motor 11 . This causes the elevator to be driven.

The rotation speed of the induction motor 11 is detected by a speed generator 12. The output of this speed generator 12 and the voltage across the capacitor 9 are applied to the control circuit 13,
As a result, the conduction angle of the converter for "back" is controlled.

Furthermore, during regeneration of the induction motor 11, the AC power applied to the regeneration converter 6 is converted there to DC power,
After the voltage is transformed to the required voltage by the autotransformer T, it is reversely fed back to the three-phase AC power source 11jl.

In this case, the conduction angle of the thyristor of the regenerative converter 6 is also controlled by the control circuit 13.

Here, the operation shown in FIG. 1 will be further explained.

That is, when the three-phase AC power supply 1 is normal, the AC power is supplied to the power supply converter 5 through the normally open contact 4A, where it is converted into DC power.

As described above, this DC power is smoothed by the DC reactor 8 and the capacitor 9, and then supplied to the inverter 10.

This inverter 10 converts the DC power back into three-phase AC power. At this time, pressure can be applied to the induction motor 1 at any frequency using PwM (pulse width modulation control).

By the way, it is well known that if the frequency/voltage ratio applied to an AC motor is set to almost 1, the desired torque can be obtained at any rotational speed, and the performance of the AC motor can be improved to the same level as a DC motor. can.

Furthermore, during regeneration, the autotransformer T1 regeneration converter 6 returns the DC power back to the power source.

Next, when the three-phase AC power supply 1 fails from a normal state, the power failure detection relay 4 detects this, and its normally open contact 4A opens and its normally closed contact 4B closes.

At this time, the diesel engine 2 drives the three-phase alternating current generator 3. The 7C3 power generated by the three-phase alternating current generator 3 is supplied to the power supply converter 5 or the regeneration converter 6 through the normally closed contact 4B.

Generally, the diesel engine 2.3-phase alternating current generator 3 is very expensive, so it is often provided with only the minimum required capacity. The capacity of this diesel engine 2.3-phase alternating current generator 3 is determined so as to satisfy the following conditions.

(a) It is possible to supply the maximum electric power necessary for operating the elevator, that is, to supply the electric power required by the induction motor 11 when accelerating a full number of passengers.

(b) To withstand thermally the average current of elevator operation, that is, to withstand the rush current when the first regeneration of the elevator is repeated for a long time.

C. It is possible to absorb electric power during regeneration. In other words, the electric power during regeneration is absorbed by the internal friction of the diesel engine 2, so in elevators with large regenerative power, it is necessary to increase the horsepower of the diesel engine 2. be.

In other words, controlling the thyristor inevitably generates harmonics, so the three-phase alternator 3 thermally withstands the isometric phase current due to these harmonics. have to endure.

For the above reasons, conventionally the three-phase alternating current generator 3 determined by (b)
Regarding the capacity (KVA), (a), (b),
Since the capacity determined by (c) is large, it was uneconomical.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide an elevator control device that can reduce the capacity of an emergency generator.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of an elevator control device of the present invention will be described based on the drawings. FIG. 2 is a block diagram showing the configuration of one embodiment. In FIG. 2, in order to avoid duplication, parts that are the same as those in FIG. 1 will be given the same reference numerals and their explanations will be omitted, and parts that are different from those in FIG. 1 will be mainly described.

In this figure 2, the diesel engine 2 in figure 1,
The normally closed contact 4B is omitted. In addition, in FIG. 2, the three-phase AC power supply 1, the emergency three-phase AC generator 3, the power failure detection relay 4, and the normally open contact 4A are not shown, but they are connected in the same way as in FIG. There is.

In addition, the difference between FIG. 2 and FIG. 1 is that a normally closed contact 4D of the power failure detection relay 4, a single-phase transformer 14, a rectifier 15, and a storage battery 16 are newly added. It is similar to FIG.

In other words, both ends of the capacitor are connected to the DC bus Ll ((G) side, L2 (←) side), and the positive terminal of the storage battery 16 is connected to the DC bus L1 as the normally closed contact of the power failure detection relay 4. Connected via 4D. On the DC bus L2,
The negative electrode of the storage battery 16 is connected.

Also, the output end of the autotransformer T is 3
The rectifier 150 is connected to the phase alternating current power supply side and also to the input end of a rectifier 150 via the single-phase transformer 14, and the output end of the rectifier 15 is connected to both the positive and negative poles of the storage battery 16.

Next, the operation of the elevator control device of the present invention configured as described above will be explained. The normal operation of the three-phase AC power supply is the same as that shown in FIG. 1, so a description thereof will be omitted.

Next, we will discuss a case where the three-phase AC power supply fails and is switched to an emergency power supply. In this case, the gates of the thyristors of the power running converter 5 and the regeneration converter 6 are turned off, and the normally closed contact 4D is closed.

Thereby, the storage battery 16 is directly connected to the DC buses Ll and L2 through the normally closed contact 4D. Therefore, this DC converter I! i! jLl and L2 are supplied with power by the storage battery 16, and are supplied with power to the inverter 10.

The inverter 10 converts the DC power of the storage battery 16 into AC power, which is supplied to the induction motor 11 .

The subsequent operations are similar to those shown in FIG. As is well known, in an elevator, power running and regeneration are repeated repeatedly, and passengers who have once gone to the upper floors of a building return to the ground again in the elevator. However, during regeneration, it is charged through the single-phase transformer 14 and rectifier 15.

Therefore, the storage battery 16 is used for the efficiency of the elevator.
Row - Regenerative power is lost, but this is reduced by /J% and is charged through the single-phase transformer 14 and rectifier 15.

Tsuma Kaede The power running of the elevator - a large load such as regeneration, the power is put in and taken out by the storage battery 16, and only the small amount of power lost during that period is replenished by the single-phase transformer 14 and rectifier 15, so the single-phase transformer 14. The rectifier 15 requires very little installed capacity, and a single-phase circuit is sufficient. As a result, the burdens listed in 0) to 2) above can be alleviated.

It should be noted that since the storage battery 16 naturally discharges even when the power source is positive, the discharge is always replenished by the single-phase transformer 14 and the rectifier 15.

Furthermore, by not using the storage battery 16 during normal power supply times and using it only during power outages, the life of the storage battery 16 can be significantly extended.

In other words, if the storage battery 16 is used even during normal times,
Although the storage battery 16 has to be replaced every few years, which requires a great deal of expense, the present invention does not have such disadvantages.

FIG. 3 is a block diagram showing a second embodiment of the invention. Although FIG. 2 shows an example in which the power running converter 5 and the regeneration converter 6 are configured with thyristors, FIG. 3 shows an example in which there is no regeneration converter.

This is used in an extremely small capacity elevator, and the regenerative power is consumed by the regenerative gravity side (goods) resistor 18. That is, in FIG. 3, a resistor 18 and a regenerative power control transistor 9 are connected between DC bus lines L1 and L2.

In addition, the input terminal of the converter 2 for the power line (2) is composed of a diode), and the contactor 20 and the normally closed contact (not shown) of the power failure detection relay are connected to the input terminal of the converter 7 for the power line.
It is connected to a 3-phase AC power supply via.

A single-phase transformer 14 is connected to the connection point between the normally closed contact and the contactor 20.

With this configuration, when the emergency power supply is in operation, the base of the regenerative power control transistor 9 is turned off, the contactor 20 is opened, and the regenerative power is supplied to the storage battery 16 through the single-phase transformer 14 and the rectifier 15. .

As described above, according to the elevator control device of the present invention, when power regeneration is repeated during operation of the emergency power source, the storage battery is charged via the emergency power source and the storage battery combination device. Therefore, the capacity of the emergency generator can be reduced,
Cost reduction is possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional elevator control device, FIG. 2 is a block diagram of an embodiment of the elevator control A1 device of the present invention, and FIG. 3 is another embodiment of the elevator control device of the present invention. FIG. 1... 3-phase AC power supply, 3... Emergency 3-phase AC generator, 5.17... Converter for power line, 6... Converter for regeneration, 7... Auto transformer, 8...・DC reactor, 9... Capacitor, 10... Inverter,
11 4-way induction machine, 12... speedometer generator, 13...
...Control circuit, 14...Single-phase transformer, 15...
- Rectifier, 16... Storage battery, 1B... Resistor for regenerative power consumption, 19... Transistor for controlling regenerative power, 20
...Contactor, Ll. L2...DC bus Of course, the same symbols in the diagram are the same and the corresponding parts are substituted.
People Makoto Kuzuno - (1 other person)

Claims (4)

[Claims] (1) a first means for converting alternating current power into direct current power;
a second means for converting the alternating current power back into variable frequency alternating current power and applying it to the alternating current motor; a storage battery that is used in conjunction with a generator to supply DC power to the DC bus on the output side of the first means;
1. An elevator control device comprising a third means for charging the storage battery during regeneration. (2) The elevator control device according to claim 1, further comprising a regeneration converter that sends DC power back to the power source during regeneration. (3) The elevator and evening control device according to claim 2, wherein the first means is constituted by a diode. (4) It has a regenerative power consumption means that is connected between the DC buses and is inactive during continuous operation by the emergency power supply and consumes regenerative power during regeneration, and a contact that is turned off during regeneration is provided on the input side of the first means. 4. The elevator control device according to claim 3, wherein the elevator control device connects to return regenerated power to the storage battery.