KR101878216B1 - Elevator power control apparatus and elevator system having the same - Google Patents

Abstract

An elevator power control apparatus includes an electric power converter connected to an AC power source, a power inverter connected to an elevator motor, a DC bus connecting the power converter and the power inverter, and an elevator drive controller electrically connecting a smoothing capacitor connected in parallel to the DC bus, And a first node and a second node for connecting the opposite ends of the smoothing capacitor and both ends of the plurality of series-connected capacitors in parallel to maintain the same voltage as the voltage on the DC bus, including an energy storage unit including series connection capacitors do. Therefore, the elevator power control device efficiently controls the energy storage device and the elevator without a separate ESS control circuit that directly controls the DC voltage between the power converter and the power inverter to control the energy storage system (ESS) Thereby reducing the cost of grid power equipment and enhancing product price competitiveness.

Description

TECHNICAL FIELD [0001] The present invention relates to an elevator power control apparatus and an elevator system including the elevator power control apparatus.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator power control technique, and more particularly, to an elevator power control technique, in which an ESS control circuit, which directly controls a DC voltage between a power converter and a power inverter to control an energy storage system (ESS) And an elevator system including the elevator power control device and the elevator power control device, which can efficiently control the elevator and reduce the maximum power size of the system, thereby reducing the cost of the grid electric power equipment and enhancing the product price competitiveness.

Generally, an elevator serves to ride a person in a vertical direction in a high-rise building, or to carry and transport a cargo. The elevator is vertically moved by driving a hoisting machine, which is a driving device, in a hoistway formed in the high-rise building, and an elevator having a predetermined space in which a person can ride or load cargo can be connected to the hoisting machine.

In addition, a three-phase industrial inverter, which is generally used for a motor for driving an elevator in place of a DC motor, can torque-control an AC motor through vector control and is used in various applications such as an elevator, a crane and a winder.

However, a conventional elevator system includes an energy storage controller and an elevator drive controller, and the energy storage controller requires a separate controller to control the energy storage. Here, the energy storage device control unit is composed of a power conversion device and an inductor, which causes a reduction in the power conversion efficiency and not only generates operation noise, but also increases the complexity of the elevator system and facilitates the production and management of the energy storage device .

Korean Patent Laid-Open No. 10-2008-0056190 relates to an elevator power system, and discloses a power system for driving a plurality of elevator elevating motors.

Korean Patent No. 10-0415747 relates to a control apparatus for an elevator, and provides a control apparatus for an elevator which is highly effective in reducing the energy-saving effect using a low-capacity and inexpensive secondary battery without impairing the effect of reducing the energy consumption due to charging .

Korean Patent Laid-Open No. 10-2008-0056190 (published on June 20, 2008) Korean Registered Patent No. 10-0415747 (Registered on January 07, 2004)

In one embodiment of the present invention, the DC voltage between the power converter and the power inverter is directly controlled without a separate ESS control circuit, thereby controlling the charge amount of the energy storage system (ESS) And to provide an elevator power control device capable of reducing the cost of the grid electric power facilities and enhancing the product price competitiveness.

In one embodiment of the present invention, the DC voltage between the power converter and the power inverter is directly controlled without a separate ESS control circuit to control the charge amount of the energy storage system (ESS, Energy Storage System) The elevator power control apparatus can efficiently control the elevator power.

An embodiment of the present invention is to provide an elevator power control apparatus capable of controlling the elevator efficiently by controlling the DC voltage between the power converter and the power inverter and the DC voltage of the energy storage system connected between them.

An embodiment of the present invention is to provide an elevator power control apparatus capable of efficiently controlling an elevator through a configuration of a plurality of capacitors included in an energy storage system without an ESS control circuit. For example, the elevator power control apparatus can utilize the energy storage system even though a portion of the energy storage system is electrically disconnected from the DC voltage between the power converter and the power inverter through the configuration of the plurality of capacitors.

Among the embodiments, the elevator power control apparatus includes a power converter connected to an AC power source, a power inverter connected to an elevator motor, a DC bus connecting the power converter and the power inverter, and an elevator electrically connecting a smoothing capacitor connected in parallel to the DC bus. A first node that connects the ends of the smoothing capacitor and both ends of the plurality of series-connected capacitors in parallel to maintain the same voltage as the voltage on the DC bus, And a second node.

In one embodiment, the elevator drive control unit controls the power converted by the power converter and the charging power of the energy storage unit together with the request power from the elevator motor, and when the remaining charge amount of the energy storage unit is equal to or greater than the first lower limit threshold, Can be provided to an elevator motor.

The elevator drive control unit may provide the elevator motor together with the power converted by the power converter and the charging power of the energy storage unit until the remaining charge amount of the energy storage unit is equal to or greater than the second lower limit threshold with respect to the requested power.

The elevator drive control unit stops providing the charging power of the energy storage unit when the remaining charge amount of the energy storage unit is less than the second lower limit threshold with respect to the requested electric power and stops the driving of the elevator motor or the regenerative electric power from the elevator motor is received The regenerative power can be charged to the first lower limit threshold value of the energy storage unit.

The elevator drive control unit may charge the energy storage unit together with the electric power converted through the electric power converter and the regenerative electric power of the elevator motor when regenerative electric power is generated from the elevator motor and the remaining charge amount of the energy storage unit is below the first upper limit threshold, can do.

The elevator drive control unit can charge only the regenerative electric power of the elevator motor to the energy storage unit when the remaining charge amount of the energy storage unit exceeds the first upper limit threshold with respect to the regenerative electric power.

The elevator drive control unit may stop charging the power of the energy storage unit when the remaining charge amount of the energy storage unit exceeds the second upper limit threshold with respect to the regenerative power and provide the regenerated power as an AC power through the power converter .

In an embodiment, the energy storage unit may further include a switch unit for switching the electrical connection of the energy storage unit according to the remaining charge amount of the energy storage unit through the control of the elevator drive control unit.

The switch unit may include switching elements connected to both ends of the plurality of series-connected capacitors.

The switch unit may include shared switching elements for grouping the plurality of series-connected capacitors to form a plurality of series-connected capacitor groups, and for switching each of the plurality of series-connected capacitor groups.

The switch unit may include non-shared switching elements for grouping the plurality of series-connected capacitors to form a plurality of independent capacitor groups, and for switching each of the plurality of independent capacitor groups.

The energy storage unit may include a magnetic circuit breaker (MC) for controlling the charge and discharge of the energy storage unit through the control of the elevator drive control unit.

In an embodiment, the elevator system includes an elevator motor for elevating the elevator according to a user's request, an ac power source, and an elevator power control device electrically connected to the ac power source and the elevator motor, An elevator drive control unit including a power converter connected to the AC power supply, a power inverter connected to the elevator motor, a DC bus connecting the power converter and the power inverter, and a smoothing capacitor connected in parallel to the DC bus, And an energy storage unit and a first node and a second node for connecting the both ends of the smoothing capacitor and both ends of the plurality of series-connected capacitors in parallel to maintain the same voltage as the voltage on the DC bus.

The disclosed technique may have the following effects. It is to be understood, however, that the scope of the disclosed technology is not to be construed as limited thereby, as it is not meant to imply that a particular embodiment should include all of the following effects or only the following effects.

The elevator power control apparatus according to an embodiment of the present invention can directly control the DC voltage between the power converter and the power inverter without a separate ESS control circuit to control the charge amount of the energy storage system (ESS) It is possible to reduce the size, thereby reducing the cost of grid power equipment and enhancing product price competitiveness.

The elevator power control apparatus according to an embodiment of the present invention can directly control the DC voltage between the power converter and the power inverter to provide an energy storage device and an energy storage device without a separate ESS control circuit for controlling the energy storage system System (ESS) can be controlled to more efficiently operate energy storage system (ESS) and elevator.

The elevator power control apparatus according to an embodiment of the present invention can control the charging and discharging of the energy storage system without the ESS control circuit, thereby enhancing the product price competitiveness, reducing the control complexity, improving the reliability of the product, Can

The elevator power control apparatus according to an embodiment of the present invention can efficiently control the elevator while making the DC voltage between the power converter and the power inverter equal to the DC voltage of the energy storage system connected between them.

An elevator power control apparatus according to an embodiment of the present invention can efficiently control an elevator through a configuration of a plurality of capacitors included in an energy storage system without an ESS control circuit.

The elevator power control apparatus according to an embodiment of the present invention can utilize the energy storage system even though a part of the energy storage system is electrically disconnected from the DC voltage between the power converter and the power inverter through the configuration of the plurality of capacitors.

The elevator power control apparatus according to an embodiment of the present invention controls the charging and discharging of the energy storage unit by controlling the switch unit connected to the energy storage unit by the elevator drive control unit and controls the charging and discharging of the power storage unit connected to the plurality of capacitors, The charge and discharge of the energy storage unit can be performed through the other power supply switching elements, so that the management and maintenance of the plurality of capacitors can be facilitated.

1 is a view for explaining an elevator system according to an embodiment of the present invention.
Fig. 2 is a circuit diagram illustrating the elevator power control apparatus shown in Fig. 1. Fig.
3 is a view for explaining embodiments of the energy storage unit of FIG.

The description of the present invention is merely an example for structural or functional explanation, and the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

It is to be understood that the singular " include " or "have" are to be construed as including the stated feature, number, step, operation, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In each step, the identification code (e.g., a, b, c, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, Unless otherwise stated, it may occur differently from the stated order. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present application.

1 is a view for explaining an elevator system according to an embodiment of the present invention.

1, an elevator system 100 includes an AC power source 110, an elevator power control device 120, an elevator motor 130, an elevator 140, an elevator string 150, and an elevator parallel weight 160 .

The AC power supply 110 supplies AC power to the elevator motor 130 so that the elevator motor 130 can control the elevator 140 at the request of the user. In one embodiment, the ac power supply 110 may provide three-phase alternating current power to the elevator motor 130.

The elevator power control apparatus 120 can control the AC power provided by the AC power supply 110 and the regenerative power provided by the elevator motor 130 to smoothly operate the elevator 140. [ That is, the elevator power control device 120 may receive three-phase alternating-current power from the alternating-current power source or may receive the single-phase alternating-current power. Further, the elevator power control device 120 can receive regenerative power from the elevator motor 130. [

The elevator motor 130 receives the requested electric power from the AC power source 110 to operate the elevator 140 and lifts the elevator 140. The elevator motor 130 generates regenerative electric power during the operation of the elevator 140 to provide regenerative electric power to the elevator power control device 120 or the alternating current power source 100. The elevator motor 130 may control the speed and direction of movement between the elevator 140 and the elevator parallel weight 160. Here, the requested electric power is the electric power required by the elevator motor 130 for the operation of the elevator 140, and may be different according to the speed and direction of movement of the elevator 140 as well as the load in the elevator car body. For example, when the elevator 140 rises with a load (i.e., a heavy load) that is larger than the weight of the parallel weight 160 or the accelerator body is accelerated or accelerated, the requested electric power for driving the elevator motor 140 And regenerative electric power can be produced from the elevator motor 130 when the elevator car body 140 decelerates or rises with a load (i.e., a light load) that is less than the weight of the parallel weight 160.

The elevator 140 is supplied with AC power from the elevator motor 130 and ascended and descended through the elevator string 150 and the elevator parallel weight 160.

Hereinafter, the elevator power control device 120 will be described in detail.

1, the elevator power control apparatus 120 includes a power converter 121a, a power inverter 121b, a DC bus 121c, a smoothing capacitor 121d, an elevator drive control unit 121, an energy storage unit 122, And is electrically connected to the first node 123 and the second node 124.

The elevator drive control unit 121 is electrically connected to the power converter 121a, the power inverter 121b, the DC bus 121c, and the smoothing capacitor 121d.

The power converter 121a is connected to the AC power source 110 and can receive the three-phase AC power from the AC power source 110 and convert it into DC power to control the DC voltage of the DC bus 121c.

The power converter 121a includes a plurality of power transistor circuits including the transistors T and the diodes D connected in parallel, as shown in Fig. For example, the transistor T may correspond to an insulated gate bipolar transistor (IGBT). The power converter 121a may include a diode rectifier circuit and a dynamic breaker (DB) (not shown). Here, DB is a function of stopping the motor by consuming the oscillation energy as a resistor in order to prevent accidents and machine breakage in case of a stop or an emergency stop during operation. That is, the diode rectifier circuit DB of the power converter 121a is connected to the elevator motor 130 so as to efficiently control the body of the elevator 140 when the electric power supplied from the AC power source 110 is supplied to the elevator motor 130, Lt; / RTI > can be used to control the power supplied to the < / RTI >

A controlled electrode of the transistor T, i.e., a gate or a base, is connected to the elevator drive control unit 121 to perform a forward role of converting AC power to DC power, or a reverse role of converting DC power to AC power . The elevator drive control unit 121 controls the power transistor circuits of the power inverter 121a to convert (convert) the three-phase AC power received from the AC power source 110 into DC power. Here, the converted DC power may be provided on the DC bus 121c connected between the power converter 121a and the power inverter 121b.

The power transistor circuits of the power converter 121a are supplied with the regenerative power from the elevator motor 130 through the DC bus 121c when the regenerative power can not be stored by the energy storage unit 122, (AC) power to the AC power source 110. In addition,

For example, the power converter 121a may be implemented as a PWM power converter, and the PWM power converter may include a drive pulse (not shown) that turns on / off the switch of each phase for generating a fundamental wave voltage having the same magnitude and frequency as the given command voltage Lt; / RTI > Here, the PWM power converter can determine the switching pattern to minimize unwanted harmonics and switching losses. The PWM power converter controls the power factor of three-phase AC power and the magnitude of the output voltage to provide or supply the controlled power to the AC power source 110.

The power inverter 110b is connected to the elevator motor 130 and can receive the DC power via the DC bus 121c with respect to the requested power of the elevator motor 130 and convert it into three-phase AC power. Alternatively, the regenerative power of the elevator motor 130 may be converted and supplied to the DC bus 121c. The power inverter 121b includes a plurality of power transistor circuits including transistors T connected in parallel and diodes D, as shown in Fig.

For example, the transistor T may be an insulated gate bipolar transistor (IGBT). A controlled electrode of the transistor T, i.e., a gate or a base, is connected to the elevator drive control unit 121 to perform a forward role of converting DC power into AC power, or a reverse function of converting AC power into DC power . The elevator drive control unit 121 may control the power transistor circuits of the power inverter 121b to convert the DC power input through the DC bus 121c into three-phase AC power. The three-phase AC power may be provided to the elevator motor 130 via the power inverter 121a.

The power transistor circuits of the power inverter 110b can rectify the electric power generated when the elevator motor 130 is driven. For example, when the elevator motor 130 produces regenerative power, the elevator drive control unit 121 controls the transistors T in the power inverter 121b to supply regenerative power generated by the elevator motor 130 to the DC bus 121c ). At this time, the smoothing capacitor 121d smoothes the converted power, i.e. DC power, provided by the power inverter 121b on the DC bus 121c. The converted power (that is, DC power) input on the DC bus 121c is charged to the energy storage unit 122 in accordance with the remaining charge amount of the energy storage unit 122 measured by the elevator drive control unit 121, 110).

The smoothing capacitor 121d is connected across the DC bus 121c. The smoothing capacitor 121d may smoothen the DC power (i.e., the rectified power) provided by the power converter 121a on the DC bus 121c.

The elevator drive control unit 121 periodically supplies the transistors T of the power converter 121a in order to supply regenerative power (i.e., three-phase AC power) from the elevator motor 130 and supply power to the AC power source 110 Pulse-modulated (PWM) schemes can be used to generate gating pulses to switch. When the regenerative power is supplied from the elevator motor 130, the PWM controls the fundamental wave amplitude of the output voltage with respect to the regenerative power, controls the fundamental wave frequency of the output voltage, reduces the harmonic components, As shown in FIG.

The elevator drive control 121 is configured to generate a gating pulse to periodically switch the transistors T of the power inverter 121b to provide a three phase AC power signal to the elevator motor 130. [ A modulation method (PWM, Pulse With Modulation) method can be used. Here, the elevator drive control unit 121 may control the moving speed and moving direction of the elevator 140 by adjusting the frequency and size of the gating pulses for the transistors T.

The elevator drive control unit 121 measures the charge remaining amount of the energy storage unit 122 and charges the converted power through the power converter 121a or the regenerative power produced by the elevator motor 130 according to the measured charge remaining amount, So that the remaining amount can be controlled to be provided to the elevator motor 130.

In FIG. 1, the energy storage 122 may include series-connected capacitors 122a. The energy storage unit 122 may include a plurality of parallel connection capacitors. The energy storage unit 122 may include at least one supercapacitor, at least one secondary battery, or a rechargeable battery. Here, the secondary battery may be a nickel-cadmium (NiCd) battery, a lead acid, a nickel metal hydride (NiMH) battery, a lithium ion battery, a lithium ion polymer A metal electrode cell, a nickel-zinc cell, a zinc / alkaline / manganese dioxide cell, a zinc bromine flow cell, , A vanadium flow battery, and a sodium-sulfur battery. Since the energy storage unit 122 arranges a plurality of relatively inexpensive capacitors 122a as energy storage devices, it is easy for maintenance and repair of the operator, and maintenance and repair costs can be saved.

Although not shown in FIG. 1, the energy storage unit may include a magnetic circuit breaker (MC) for controlling charge and discharge of the energy storage unit through the control of the elevator drive control unit. Here, the electric circuit breaker is an electric device in which the main circuit is used for a circuit of a specific frequency or lower, under a specific rated insulation voltage, and can start, stop and control the motor at a remote place. Metal parts are rationally combined and the main contacts are opened and closed by using the principle of the electromagnet, so that the present invention can be applied to a control device for starting and stopping motors and configuring various sequences. Therefore, in the present invention, the electronic circuit breaker may be disposed at both ends of the plurality of capacitors 122a of the energy storage unit 122. [ The electronic circuit breaker is controlled by the elevator drive control unit 121 to open and close the main contact and to convert the power converted by the power converter 121a or the regenerative power supplied from the elevator motor 130 into a plurality of And the charging power charged in the energy storage unit 122 may be supplied to the elevator motor 130. [0051]

The first node 123 and the second node 124 may connect both ends of the smoothing capacitor 121d and both ends of the plurality of series connection capacitors 122a in parallel to maintain the same voltage as the voltage on the DC bus 121c have. The first node 123 and the second node 124 are connected to the elevator drive control unit 121 to charge the energy stored in the energy storage unit 122 by the AC power supply 110 or to regenerate The first node 123 and the second node 124 and the DC bus 121c to charge the energy storage unit 122 or provide the electric power stored in the energy storage unit 122 to the elevator motor 130. [ Can be controlled so as to maintain the same voltage.

Hereinafter, the charging / discharging of the energy storage unit 122 through the elevator drive control unit 121 will be described in detail with reference to FIG.

Fig. 2 is a circuit diagram illustrating the elevator power control apparatus shown in Fig. 1. Fig.

2, the energy storage unit 122 in the elevator power control apparatus 120 includes a plurality of capacitors 122a and a switch unit 122b, the remaining components being substantially And therefore detailed description will be omitted. Hereinafter, a control method of the energy storage unit 122 by the elevator drive control unit 121 will be described.

The elevator drive control unit 121 controls the elevator drive control unit 121 so that the electric power converted through the power converter 121a and the electric power converted by the elevator motor 130 are equal to each other, The charging power of the energy storage unit 122 can be supplied to the elevator motor 130 together.

Here, the requested power can be measured or estimated through the power sensor. The elevator drive control unit 121 can measure the remaining charge amount of the energy storage unit 122 through the charge sensor. The elevator drive control unit 121 may measure the charge remaining amount of the energy storage unit 122 based on the predetermined first lower limit threshold value, the second lower limit threshold value, the first upper limit threshold value, and the second upper limit threshold value. The elevator drive control unit 121 can perform both charge and discharge operations on the energy storage unit 122 when the remaining charge amount of the energy storage unit 122 is between the first lower limit threshold value and the first upper limit threshold value. The first lower limit threshold value is a reference threshold value for determining whether or not the electric power charged in the energy storage unit 122 can be supplied (discharged) to the elevator motor 130. [

Assuming, for example, that the requested power in the elevator motor 130 is 80 kW and the elevator drive control 121 is capable of receiving up to 50 kW of power from the alternating current source 110, The elevator drive control unit 121 controls the elevator motor 130 to provide the elevator motor 130 with 50 kw of the AC power 110 and 30 kw of the charging power of the energy storage unit 122, can do. Since the elevator drive control unit 121 receives the request power from the elevator motor 130 when the remaining charge amount of the energy storage unit is equal to or greater than the first lower limit threshold value, the remaining charge amount of the energy storage unit 122 reaches the second lower limit threshold value The energy stored in the energy storage unit 122 can be supplied to the elevator motor 130. [

In one embodiment, the elevator drive control unit 121 controls the energy stored in the energy storage unit 122 and the power converted through the power converter 121a until the charge remaining amount of the energy storage unit 122 is equal to or greater than the second lower limit threshold, Can be supplied to the elevator motor 130 together. Here, the second lower limit threshold is set so that even if the electric power charged in the energy storage unit 122 falls below the first lower limit threshold when the elevator motor 130 requests the requested power above the first lower limit threshold, the elevator motor 130 ) Of the power supply.

For example, when the elevator drive control unit 121 receives 80 kilowatts of power consumed by the elevator motor 130 and the elevator drive control unit 121 receives 50 kilowatts of power from the alternating current power supply 110, The elevator drive control unit 121 controls the elevator drive control unit 121 to supply the alternating current power of 50 kW supplied from the alternating current power supply 110 to the energy storage unit 122 It is possible to control the electric power of the charging power of 30 kW to be provided to the elevator motor 230 together. Here, the elevator drive control unit 121 receives the request electric power from the elevator motor 130 in a situation where the electric power discharge of the energy storage unit 122 starts at the first lower limit threshold value or more and the present charge remaining amount is equal to or higher than the second lower limit threshold value Therefore, the power stored in the energy storage unit 122 can be continuously supplied to the elevator motor 130 until the remaining charge amount of the energy storage unit 122 reaches the second lower limit threshold.

The elevator drive control unit 121 receives the request power from the elevator motor 130 when the present charge remaining amount of the energy storage unit 122 is between the first lower limit threshold and the second lower limit threshold, It is not possible to supply the electric power charged in the elevator motor 130 to the elevator motor 130. This is because it is difficult to provide it to the elevator motor 130 because the energy storage unit 122 is charged with a minimum amount of electric power.

In one embodiment, the elevator drive control unit 121 provides the charging power of the energy storage unit 122 to the elevator motor 130 when the remaining charge amount of the energy storage unit 122 is less than the second lower limit threshold with respect to the requested power Can be stopped. The elevator drive control unit 121 controls the energy storage unit 122 as soon as the remaining charge amount of the energy storage unit 122 is less than the second lower limit threshold, The charging power of the elevator motor 130 can be stopped.

The elevator drive control unit 121 stops providing the charging power of the energy storage unit 122 to the elevator motor 130 when the charge remaining amount of the energy storage unit 122 is less than the second lower limit threshold, The energy storage unit 122 can be charged with a part of the converted power. The elevator motor 130 can elevate the elevator 140 by receiving only the converted power through the power converter 121a.

For example, the elevator drive control unit 121 may control the elevator drive control unit 121 to control the elevator motor 130 so that when the remaining charge amount of the energy storage unit 122 is less than the second lower limit threshold and the elevator motor 130 is in an emergency situation, A user who uses the elevator 140 by supplying all of the present charge remaining amount of the energy storage unit 122 to the elevator motor 130 or supplying the minimum amount of power capable of driving the elevator motor 130 It is possible to cope with an emergency situation.

The elevator drive control unit 121 may charge the regenerative electric power to the first lower limit threshold of the energy storage unit 122 when the driving of the elevator motor 130 is stopped or the regenerative electric power is received from the elevator motor 130 can do. Here, the first lower limit threshold is set so that when the electric power stored in the energy storage unit 122 can be supplied to the elevator motor 130, that is, when the electric power of the first lower limit threshold value is charged to the minimum electric power supply limit value, Power can be supplied to the motor 130.

If the regenerative power of the elevator motor 130 is insufficient, the elevator drive control unit 121 controls the power supplied from the AC power source 110, that is, the power changed through the power converter 121a, It can be charged to a lower limit threshold value or more.

In one embodiment, the elevator drive controller 121 controls the electric power converted through the power converter 121a and the electric power stored in the energy storage unit 122 if the regenerative electric power is generated from the elevator motor 130 and the remaining charge amount of the energy storage unit 122 is equal to or less than the first upper limit threshold value. The regenerative electric power of the elevator motor 130 can be charged into the energy storage unit 122 together. Here, the first upper limit threshold means a reference threshold for determining whether or not the energy storage unit 122 can be charged with electric power.

For example, if the elevator drive control unit 121 receives the power converted through the power converter 121a and the regenerative power from the elevator motor 130 when the remaining charge amount of the energy storage unit 122 is lower than the first lower limit threshold, The converter 121a can continuously charge the converted power and the regenerated power until the remaining charged amount of the energy storage unit 122 reaches the second upper limit threshold.

The elevator drive controller 121 charges the energy storage unit 122 only with the regenerated electric power of the elevator motor 130 when the remaining charge amount of the energy storage unit 122 exceeds the first upper limit threshold value with respect to the regenerative electric power, can do. Here, the first upper limit threshold means a limit value at which electric power supplied from the AC power source 110 and converted through the power converter 121a and regenerative power of the elevator motor 130 can be charged together.

For example, the elevator drive control unit 121 controls the elevator drive control unit 121 such that the electric power charging of the energy storage unit 122 starts below the first upper limit threshold and the current charge remaining amount exceeds the first lower limit threshold, The energy storage unit 122 can be charged with electric power continuously until the remaining charge amount of the energy storage unit 122 reaches the second upper limit threshold value.

The elevator drive control unit 121 controls the electric power converted by the power converter 121a and the electric power supplied to the elevator 120a in a situation where the power charging of the energy storage unit 122 starts below the first upper limit threshold and the current charge remaining amount exceeds the first lower limit threshold, The elevator drive control unit 121 can continuously charge the regenerative electric power of the elevator motor 130 only until the remaining charge amount of the energy storage unit 122 reaches the second lower limit threshold have.

However, the elevator drive control unit 121 supplies power converted through the power converter 121a and regenerative power from the elevator motor 130 in a state where the present charge remaining amount of the energy storage unit 122 exceeds the first upper limit threshold The energy storage unit 122 can not be charged with electric power. This means that the energy storage unit 122 is filled with the maximum amount of power and can not charge the energy storage unit 122 to protect the capacitor of the energy storage unit 122. [

The elevator drive control unit 121 controls the energy storage unit 122 so as to prevent the power converted through the power converter 121a from being charged when the remaining charge amount of the energy storage unit 122 exceeds the first upper limit threshold, It is possible to charge only the regenerative power supplied from the power storage unit 130 to the energy storage unit 122. The elevator drive control unit 121 controls the power converter 121a to be discharged to the AC power source 110 through the power converter 121a without charging the converted power through the power converter 121a into the storage unit 122 .

In one embodiment, the elevator drive control unit 121 stops charging the power of the energy storage unit 122 when the remaining charge amount of the energy storage unit 122 exceeds the second upper limit threshold value with respect to the regenerative power, And may be provided to the AC power source 110 through the converter 121a. Here, the second upper limit threshold is set so that even if the electric power stored in the energy storage unit 122 rises above the first upper limit threshold when the elevator motor 130 supplies the regenerative power at the first upper limit threshold or more, 122) to continuously charge the power.

The elevator drive control unit 121 controls the AC power supply 110 to supply the regenerated power to the energy storage unit 122 through the power converter 121a so that the regenerated power is no longer charged to the energy storage unit 122 when the remaining charge amount of the energy storage unit 122 exceeds the second upper limit threshold. ). ≪ / RTI > The plurality of capacitors 122a of the energy storage unit 122 may stop its operation at an overvoltage when the remaining charge amount of the energy storage unit 122 exceeds the second upper limit threshold. The elevator drive control unit 221 controls the regenerative power of the elevator motor 130 to the AC power source 110 through the power converter 121a in order to prevent the operation of the plurality of capacitors 122a from being stopped by the overvoltage protection device. As shown in FIG.

In one embodiment, the energy storage unit 122 includes a plurality of series connected capacitors 122a and a switch unit 122b, as shown in FIG.

2, the switch unit 122b is connected to the energy storage unit 122 and controls the energy storage unit 122 according to the remaining charge amount of the energy storage unit 122 through the control of the elevator drive control unit 121, To switch the electrical connection with a plurality of capacitors (122a) of the switch. Here, the switch portion 122b may be connected to the respective switching elements, such as an initial charging resistor (not shown) necessary for connecting the power converter 121a and the power inverter 121b, that is, two voltage sources.

For example, when the elevator drive control unit 121 turns on the switch unit 122b, the electric power converted through the power converter 121a is charged into the energy storage unit 122, or the regenerated electric power generated by the elevator motor 130 Can be charged into the energy storage unit 122. [ Conversely, when the elevator drive control unit 121 turns off the switch unit 122b, the electrical connection with the plurality of capacitors 122a is cut off and the electric power converted through the power converter 121a is charged into the energy storage unit 122 Or the regenerative power produced by the elevator motor 130 can not be charged into the energy storage unit 122. [

 The switch unit 121b may use various switching devices including a relay switching device. Hereinafter, the switch unit 121b will be described in detail with reference to FIG.

3 is a view for explaining embodiments of the energy storage unit of FIG.

3 (a) assumes that the switch portion 322b connects both ends of a plurality of series-connected capacitors 322a. More specifically, the switch portion 322b may include a switching element connected to both ends of the plurality of series-connected capacitors.

The switch unit 322b can turn on / off the switching device by the elevator drive control unit 321. [

The switch unit 322b switches the power converted by the elevator drive control unit 321 through the power converter 121a or the regenerative power supplied from the elevator motor 130 according to the remaining charge amount of the energy storage unit 322 to the energy storage unit 322 or to turn on the switching element to provide the electric power stored in the energy storage 322 to the elevator motor 130. [

The switch unit 322b turns off the switching device to stop supplying the electric power stored in the energy storage unit 322 to the elevator motor 130 in accordance with the remaining charge amount of the energy storage unit by the elevator drive control unit 321 .

3 (b) assumes that the switch unit 322b connects a plurality of grouped series-connected capacitors 322a, respectively. More specifically, the switch unit 322b forms a plurality of groups of the series-connected capacitors 322a by grouping the plurality of series-connected capacitors 322a, and a shared switching unit 322b that switches each of the groups of the plurality of series- Devices A may be included. Here, the shared switch element A means a switch element commonly used between the capacitor groups as shown in Fig. 3 (b).

In one embodiment, the switch portion 322b groups a plurality of series-connected capacitors 322a into a plurality of groups of independent capacitors 322a, as shown in Fig. 3 (b) (B) for switching each of the non-shared switching elements (B). Here, the non-shared switching elements B means a switch which switches each of a plurality of independent capacitor groups without sharing among the capacitor groups as shown in Fig. 3 (b).

The switch unit 322b of FIG. 3B is connected to the shared A and non-shared (B) switching devices for grouping the plurality of series-connected capacitors 322a to switch each independent capacitor group 322a, The capacitor 322a of the energy storage unit 322 is charged with the regenerative power or the power converted through the power converter through other switching elements even if any one of the capacitor groups of the capacitor groups 322a fails or any switching element is disconnected Or provide the electric power charged in the capacitor 322a of the energy storage unit 322 to the elevator motor 130. [ Also, the energy storage unit 322 can easily manage and maintain a plurality of capacitors 322a connected to the switch unit 322b.

3 (c) assumes that the switch portion 322b connects a plurality of independent capacitors 322a, respectively. More specifically, the switch portion 322b may include a switching element disposed at each end of each of the plurality of independent capacitors 322a.

The switch unit 322b switches the power converted by the elevator drive control unit 321 through the power converter 121a or the regenerative power supplied from the elevator motor 130 according to the remaining charge amount of the energy storage unit 322 to the energy storage unit 322 or to turn on the switching element to provide the electric power stored in the energy storage 322 to the elevator motor 130. [

In the switch portion 322b of FIG. 3 (c), a switching element is connected to both ends of each of the plurality of parallel connection capacitors 322a, so that if any one of the capacitors is broken or any switching element is disconnected The power stored in the capacitor 322a of the energy storage unit 322 or the power stored in the capacitor 322a of the energy storage unit 322 may be supplied to the elevator motor 130 through the other switching elements through the regenerative power or the power converter, ). Also, the energy storage unit 322 can easily manage and maintain a plurality of capacitors 322a connected to the switch unit 322b.

Therefore, the elevator power control device can directly control the DC voltage between the power converter and the power inverter without a separate ESS control circuit, thereby controlling the charge amount of the energy storage system (ESS, Energy Storage System) It can reduce the cost of grid power equipment and strengthen the price competitiveness of the product. (ESS) by directly controlling the DC voltage between the power converter and the power inverter and controlling the energy storage device and the energy storage system (ESS) without a separate ESS control circuit for controlling the energy storage system (ESS) And the elevator can be operated more efficiently.

By controlling the charging and discharging of the energy storage system without ESS control circuit, it can strengthen the product price competitiveness, reduce the control complexity, improve the reliability of the product, and improve the convenience of manufacture and management. The elevator can be efficiently controlled by controlling the DC voltage between the power converter and the power inverter and the DC voltage of the energy storage system connected between them equally. Without the ESS control circuit, the elevator can be efficiently controlled through the configuration of a plurality of capacitors included in the energy storage system. The configuration of the plurality of capacitors may utilize an energy storage system even though a portion of the energy storage system is electrically disconnected from the DC voltage between the power converter and the power inverter. The elevator drive control unit controls the switch unit connected to the energy storage unit to control charging and discharging of the energy storage unit, and even if a disconnection occurs in any one of the power supply switching devices connected to the plurality of capacitors, It is possible to perform the management and maintenance of a plurality of capacitors.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims And changes may be made without departing from the spirit and scope of the invention.

100: Elevator power control system
110: AC power source
120, 320: elevator power control device
121, 321: elevator drive control section
121a: Power converter
121b: Power inverter
121c: DC bus
121d: smoothing capacitor
122,322: Energy storage unit
122a and 322a:
130: Elevator motor
140: Elevator
150: Elevator line
160: Elevator Parallel Weights
222b and 322b:
T: transistor
D: Diode
A: Shared switching element
B: Non-shared switching element

Claims (13)

A power converter connected to the AC power source and connected in parallel as a bidirectional switching element and including diode pairs, a power inverter connected to an elevator motor, a DC bus connecting the power converter and the power inverter, and a smoothing capacitor connected in parallel to the DC bus, An elevator drive control unit connected to the elevator drive control unit;
(a) a plurality of series-connected capacitor groups configured by grouping a plurality of series-connected capacitors and (b) a shared-switch element shared with at least a part of the plurality of series-connected capacitor groups and a non-shared- Energy storage; And
And a first node and a second node for connecting the both ends of the smoothing capacitor and both ends of the plurality of series-connected capacitors in parallel to maintain the same voltage as the voltage on the DC bus,
The elevator drive control unit
Controlling forward and backward switching of the bidirectional switching element and on / off of the shared switching element and the non-shared switching element according to the remaining charge amount of the energy storage part measured through the power sensor to control charge and discharge of the energy storage part,
Wherein when the regenerative electric power supplied from the elevator motor can not be stored in the energy storage unit, the bidirectional switching element is controlled to be inversely switched and the shared switching element and the non- The elevator power control device comprising:
2. The elevator system as claimed in claim 1, wherein the elevator drive control unit
And the elevator motor supplies the power converted by the power converter and the charging power of the energy storage unit together to the elevator motor when the requested electric power is generated from the elevator motor and the remaining charge amount of the energy storage unit is equal to or greater than the first lower limit threshold. Power control device.
3. The elevator system as claimed in claim 2, wherein the elevator drive control unit
And supplies the power converted by the power converter and the charging power of the energy storage unit together to the elevator motor until the remaining charge amount of the energy storage unit is equal to or greater than the second lower limit threshold with respect to the requested power. .
4. The elevator system as claimed in claim 3, wherein the elevator drive control unit
When the remaining charge amount of the energy storage unit is less than the second lower limit threshold with respect to the requested power, stopping the charging power supply of the energy storage unit, and when the regenerative power is received from the elevator motor, Wherein the electric power is charged to a value equal to or greater than a threshold value.
2. The elevator system as claimed in claim 1, wherein the elevator drive control unit
And the energy storage unit is charged with the electric power converted through the power converter and the regenerative electric power of the elevator motor together when regenerative electric power is generated from the elevator motor and the remaining charge amount of the energy storage unit is below the first upper limit threshold value Elevator power control device.
6. The elevator system as claimed in claim 5, wherein the elevator drive control unit
Wherein the control unit charges only the regenerative electric power of the elevator motor into the energy storage unit when the remaining charge amount of the energy storage unit exceeds the first upper limit threshold with respect to the regenerative electric power.
6. The elevator system as claimed in claim 5, wherein the elevator drive control unit
And stops the charging of the energy storage unit when the charge remaining amount of the energy storage unit exceeds the second upper limit threshold with respect to the regenerative power and provides the regenerative power as an AC power supply through the power converter Device.
delete delete delete delete The apparatus of claim 1, wherein the energy storage unit
And an electric circuit breaker (MC) for controlling charge and discharge of the energy storage unit through the control of the elevator drive control unit.
An elevator motor for elevating and lowering the elevator according to a user's request;
AC power supply; And
And an elevator power control device electrically connected to the ac power source and the elevator motor,
The elevator power control device
A power converter coupled to the AC power source and including transistors and diode pairs connected in parallel as bidirectional switching elements, a power inverter coupled to the elevator motor, a DC bus connecting the power converter and the power inverter, and a smoothing capacitor connected in parallel with the DC bus An elevator drive control unit electrically connected to the elevator drive control unit;
(a) a plurality of series-connected capacitor groups configured by grouping a plurality of series-connected capacitors and (b) a shared-switch element shared with at least a part of the plurality of series-connected capacitor groups and a non-shared- Energy storage; And
And a first node and a second node for connecting the both ends of the smoothing capacitor and both ends of the plurality of series-connected capacitors in parallel to maintain the same voltage as the voltage on the DC bus,
The elevator drive control unit
Controlling forward and backward switching of the bidirectional switching element and on / off of the shared switching element and the non-shared switching element according to the remaining charge amount of the energy storage part measured through the power sensor to control charge and discharge of the energy storage part,
Wherein when the regenerative electric power supplied from the elevator motor can not be stored in the energy storage unit, the bidirectional switching element is controlled to be inversely switched and the shared switching element and the non- And the elevator system.

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