CN113949056A - Elevator energy conversion system and conversion method thereof - Google Patents

Elevator energy conversion system and conversion method thereof Download PDF

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Publication number
CN113949056A
CN113949056A CN202111238731.6A CN202111238731A CN113949056A CN 113949056 A CN113949056 A CN 113949056A CN 202111238731 A CN202111238731 A CN 202111238731A CN 113949056 A CN113949056 A CN 113949056A
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CN
China
Prior art keywords
power supply
management system
supply device
bus
direct current
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Pending
Application number
CN202111238731.6A
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Chinese (zh)
Inventor
唐小利
张楷会
胥文明
卢曦
仇一鸣
赵珍珍
董春友
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Xizi Lift Co ltd
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Xizi Lift Co ltd
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Priority to CN202111238731.6A priority Critical patent/CN113949056A/en
Publication of CN113949056A publication Critical patent/CN113949056A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/14—Balancing the load in a network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/066—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems characterised by the use of dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/06—Controlling the motor in four quadrants

Abstract

The invention provides an elevator energy conversion system, comprising: the driver comprises a rectifying module, an inverting module and a direct current bus; a power supply device; the battery management system is connected with the power supply device and is used for managing the power supply device; the DC/DC controller is connected between the direct current bus of the driver and the battery management system and is used for controlling the direct current bus of the driver to charge the power supply device or discharging the power supply device to the direct current bus of the driver; and the energy management system is connected with the direct current bus of the driver and the battery management system and controls the on-off of the DC/DC controller. An elevator energy conversion method is also provided. The invention realizes that the electric energy generated on the direct current bus of the driver during the power generation operation of the elevator is transferred into the power supply device for storage and then is transmitted to the direct current bus to provide the electric energy for the elevator during the power consumption operation, thereby realizing the feedback self-utilization of the energy of the elevator.

Description

Elevator energy conversion system and conversion method thereof
Technical Field
The invention relates to the field of elevators, in particular to an elevator energy conversion system and an elevator energy conversion method.
Background
At present, in the elevator industry, the electric energy converted from the potential energy of the elevator is generally consumed by braking resistance, so that the energy utilization efficiency is low; part of elevators also adopt four-quadrant operation control of a motor, and electric energy is fed back to a power grid. By adopting a four-quadrant running feedback brake control mode, although the energy utilization efficiency of the system is improved and feedback electric energy is subjected to feedback utilization, the following defects exist: 1. the feedback braking mode can be adopted only under the stable power grid voltage which is not easy to break down, because when the power generation braking operation is carried out, the failure time of the power grid voltage is more than 2ms, the phase change failure can occur, and the device is damaged; 2. during feedback, harmonic pollution is caused to a power grid; 3. the control is complex and the cost is high; 4. reducing the system power factor.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides an elevator energy conversion system and an elevator energy conversion method, which can realize that electric energy generated on a direct current bus of a driver is transferred to a power supply device to be stored when an elevator runs upwards under light load or heavy load, and then is transmitted to the direct current bus to provide electric energy for the elevator when the elevator runs downwards under light load or heavy load, so that the feedback self-utilization of the elevator energy is realized, and the effect of saving the electric energy is further realized.
In order to achieve the above object, an aspect of the present invention provides an elevator energy conversion system including:
the driver comprises a rectifying module, an inverting module and a direct current bus;
a power supply device;
the battery management system is connected with the power supply device and is used for managing the power supply device;
the DC/DC controller is connected between the direct current bus of the driver and the battery management system and is used for controlling the direct current bus of the driver to charge the power supply device or discharging the power supply device to the direct current bus of the driver;
and the energy management system is connected with the direct current bus of the driver and the battery management system and controls the DC/DC controller.
Preferably, the energy management system obtains a voltage signal of the DC bus, and when the voltage of the DC bus is greater than 540V, controls the DC/DC controller to transfer the electric energy on the DC bus to the power supply device; and when the voltage of the direct current bus is less than 540V, controlling the DC/DC controller to transfer the electric energy of the power supply device to the direct current bus.
Preferably, the battery management system sends the power amount of the power supply device to the energy management system, when the voltage of the DC bus is greater than 540V and the power amount of the power supply device is not greater than an upper limit value, the battery management system outputs a charging voltage and a charging current required by the power supply device to the energy management system, and the energy management system outputs a first level control signal to the DC/DC controller to control the DC/DC controller to transfer the power amount on the DC bus to the power supply device; when the voltage of the direct current bus is less than 540V and the electric quantity of the power supply device is not less than a lower limit value, the battery management system outputs discharge voltage and discharge current required by the power supply device to the energy management system, the energy management system outputs a second level control signal to the DC/DC controller, and the DC/DC controller is controlled to transfer the electric energy of the power supply device to the direct current bus.
Preferably, the DC/DC controller includes a Boost circuit, an input end of the Boost circuit is connected to the battery management system, an output end of the Boost circuit is connected to the DC bus, the Boost circuit includes a first inductor, a second inductor, a first capacitor, a second capacitor, a first diode, a second diode, a third diode and a switching tube, an input end of the first inductor is connected to an anode of the input end of the Boost circuit, and an output end of the first inductor is connected to an anode of the first diode and an anode of the second diode respectively; the cathode of the first diode is respectively connected with one end of the second inductor and one end of the first capacitor; the other end of the second inductor is respectively connected with the cathode of the second diode, the drain of the switching tube and the anode of the third diode; the cathode of the third diode is respectively connected with one end of the second capacitor and the anode of the output end of the Boost circuit; the other end of the first capacitor, the other end of the second capacitor and the source electrode of the switch tube are connected with the input end and the negative electrode of the output end of the Boost circuit, and the switch tube is controlled to be switched on and off by the energy management system.
Preferably, the power supply means comprises an emergency power supply.
Preferably, the emergency power supply comprises a storage battery, and the storage battery is a ternary lithium battery or a lithium titanate battery.
In another aspect, the present invention also provides an elevator energy conversion method for an elevator energy conversion system, the method comprising:
when the voltage of the direct current bus is larger than 540V, the energy management system controls the DC/DC controller to transfer the electric energy of the direct current bus into the power supply device;
when the voltage of the direct current bus is less than 540V, the energy management system controls the DC/DC controller to transfer the electric energy of the power supply device to the direct current bus.
Preferably, when the voltage of the direct current bus is greater than 540V, the energy management system controls the DC/DC controller to transfer the electric energy of the direct current bus to the power supply device; when the voltage of the direct current bus is less than 540V, the energy management system controls the DC/DC controller to transfer the electric energy of the power supply device to the direct current bus comprises the following steps:
when the voltage of the direct current bus is larger than or equal to 600V, the energy management system controls the DC/DC controller to transfer the electric energy of the direct current bus into the power supply device;
when the voltage of the direct current bus is smaller than or equal to 520V, the energy management system controls the DC/DC controller to transfer the electric energy of the power supply device to the direct current bus.
Preferably, the controlling, by the energy management system, the DC/DC controller to transfer the electric energy of the DC bus to the power supply device when the voltage of the DC bus is greater than 540V includes:
when the voltage of the direct current bus is greater than 540V, the energy management system further judges whether the electric quantity of the power supply device is not greater than an upper limit value, if so, the battery management system outputs the charging voltage and the charging current required by the power supply device, and the energy management system outputs a first level control signal to the DC/DC controller to control the direct current bus to charge the power supply device.
Preferably, the controlling, by the energy management system, the DC/DC controller to transfer the electric energy of the power supply device to the DC bus when the voltage of the DC bus is less than 540V includes:
when the voltage of the direct current bus is less than 540V, the energy management system further determines whether the electric quantity of the power supply device is not less than a lower limit value, if so, the battery management system outputs a discharge voltage and a discharge current required by the power supply device, and the energy management system outputs a second level control signal to the DC/DC controller to control the power supply device to discharge to the direct current bus.
The invention utilizes the battery management system and the energy management system to automatically convert the electric energy according to the voltage of the direct current bus and the electric quantity of the power supply device, can realize that the electric energy generated on the direct current bus of the driver is transferred into the power supply device to be stored when the elevator is in light load ascending or heavy load descending, and then is transmitted to the direct current bus to provide the electric energy for the elevator when the elevator is in light load descending or heavy load ascending, thereby realizing the feedback self-utilization of the energy of the elevator and further realizing the effect of saving the electric energy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of the elevator energy conversion system of the present invention;
fig. 2 is a circuit schematic of a DC/DC controller in the elevator energy conversion system of the present invention;
fig. 3 is a block diagram of a battery management system in the elevator energy conversion system of the present invention;
fig. 4 is a logic diagram of charging a power supply device with a dc bus in the elevator energy conversion method of the present invention;
fig. 5 is a logic diagram of discharging the power supply device to the dc bus in the elevator energy conversion method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, fig. 1 is a structural block diagram of an elevator energy conversion system of the present invention, fig. 2 is a schematic circuit diagram of a DC/DC controller in the elevator energy conversion system of the present invention, fig. 3 is a structural block diagram of a battery management system in the elevator energy conversion system of the present invention, fig. 4 is a logical schematic diagram of charging a power supply device with a DC bus in an elevator energy conversion method of the present invention, and fig. 5 is a logical schematic diagram of discharging the power supply device with the DC bus in the elevator energy conversion method of the present invention.
The elevator runs in two states of power consumption running and power generation running. The load of the elevator is potential energy type load, and in order to balance the load capacity of the elevator car, a counterweight block is arranged on the other side. Only when the car load is half of the rated load, the weight on the car side and the counterweight side can be substantially balanced, otherwise, the car side and the counterweight side will have a poor mass. In most cases, the operation of an elevator can thus be divided into four cases: light load uplink, light load downlink, heavy load uplink and heavy load downlink. When the elevator is in light load descending or heavy load ascending, the counterweight or the elevator car needs a traction machine to drag the elevator to ascend, and at the moment, the traction machine is in a power consumption state, and the elevator is in a power consumption running state; when a light load ascends or a heavy load descends, the traction machine needs to restrain the counterweight or the elevator car from descending, the traction machine is in a power generation state at the moment, and the elevator is in a power generation operation state. In addition, most of the elevators used use a drive in the elevator control system to drive the hoisting machine, the mechanical energy is maximized when the elevator reaches the rated running speed, and the elevator is decelerated gradually until the elevator stops running before reaching the destination floor, which is also a process in which the mechanical energy of the elevator is large. The redundant mechanical energy generated in the running process of the elevator is converted into direct current electric energy through the traction machine and the driver and stored in the capacitor in the direct current bus of the driver, the more the electric energy stored in the capacitor is, the higher the voltage of the direct current bus is, if the excessive electric energy stored in the capacitor cannot be released in time, overvoltage can be caused, the overvoltage protection of the driver is realized, the elevator cannot run normally, and the driver can be damaged.
The invention provides an elevator energy conversion system, as shown in fig. 1, comprising:
the driver comprises a rectification module, an inversion module and a direct current BUS DC-BUS;
a power supply device;
a battery management system BMS connected to the power supply device for managing the power supply device;
a DC/DC controller connected between the DC BUS DC-BUS of the driver and the battery management system BMS for controlling the DC BUS DC-BUS of the driver to charge the power supply device or the power supply device to discharge the DC BUS DC-BUS of the driver;
and an energy management system EMS which is connected with the direct current BUS DC-BUS of the driver and the battery management system BMS and controls the DC/DC controller.
The battery management system BMS and the energy management system EMS are the main components of the energy storage system responsible for management and control. The battery management system BMS is responsible for collecting information such as voltage, temperature, current, capacity and the like of the energy storage battery pack, monitoring the real-time state and analyzing faults, and is in online communication with the energy storage converter and the monitoring and scheduling system through the CAN bus to realize optimized charging and discharging management control on the battery; the energy management system EMS is the brain of the energy storage system, mainly realizes reasonable energy scheduling, controls the charging and discharging of the energy storage converter (PCS) through uploaded information and issued instructions according to the peak-valley level characteristics of a power grid, realizes the economic operation of the microgrid, and has the functions of operation optimization, load prediction, power generation prediction, micro-source scheduling, tidal current control and the like.
The elevator energy feedback control system utilizes the battery management system BMS to intelligently manage the power supply device, utilizes the energy management system EMS to be connected with the battery management system BMS and the direct current BUS DC-BUS of the driver to acquire information, automatically controls the conversion of electric energy between the direct current BUS DC-BUS of the driver and the power supply device in the elevator control system, realizes the transfer of the electric energy generated by the elevator in light load ascending or heavy load descending to the power supply device from the direct current BUS DC-BUS, and transfers the electric energy stored in the power supply device to the direct current BUS DC-BUS to provide the electric energy for the elevator when the elevator is in light load descending or heavy load ascending, thereby realizing the feedback self-utilization of the elevator energy and further realizing the effect of saving the electric energy.
In some embodiments, the energy management system EMS obtains a voltage signal of the DC BUS DC-BUS, and when the voltage of the DC BUS DC-BUS is greater than 540V, the energy management system EMS controls the DC/DC controller to transfer the electric energy on the DC BUS DC-BUS to the power supply device; when the voltage of the DC-BUS is less than 540V, the energy management system EMS controls the DC/DC controller to transfer the electric energy of the power supply device to the DC-BUS.
The energy management system EMS monitors the voltage of the DC-BUS in real time, and automatically identifies whether the DC-BUS is in an energy feedback state or an energy consumption state, so that the energy transmission of the DC/DC controller is controlled. The DC bus voltage, i.e. the grid voltage, is AC380V, and when the elevator is in standby, its voltage is rectified to DC 540V. When the elevator runs downwards under light load or runs upwards under heavy load, the traction machine is in a power consumption state, the voltage of the direct current BUS can be reduced to be below DC540V, and when the voltage of the direct current BUS is set to be reduced to be below 540V, the power supply device discharges to the DC-BUS of the direct current BUS, so that the storage battery supplies power to the elevator; when the elevator is in a light-load ascending or heavy-load descending state, the tractor is in a power generation state, the voltage of the direct current bus rises to more than DC540V, and when the voltage of the direct current bus is set to rise to more than 540V, the direct current bus charges the power supply device to realize energy storage.
In some embodiments, the battery management system BMS sends the power of the power supply device to the energy management system EMS, when the voltage of the DC-BUS is greater than 540V and the power of the power supply device is not greater than an upper limit value, the battery management system BMS outputs a charging voltage and a charging current required by the power supply device to the energy management system EMS, and the energy management system EMS outputs a first level control signal to the DC/DC controller to control the DC/DC controller to transfer the power on the DC-BUS to the power supply device; when the voltage of the DC-BUS is less than 540V and the electric quantity of the power supply device is not less than a lower limit value, the battery management system BMS outputs the discharging voltage and the discharging current required by the power supply device to the energy management system EMS, the energy management system EMS outputs a second level control signal to the DC/DC controller, and the DC/DC controller is controlled to transfer the electric energy of the power supply device to the DC-BUS.
The battery management system BMS monitors the battery state in real time according to the actual operation working condition of the elevator, manages the battery energy, and the maximization of the battery life and the energy utilization rate is realized through the charge and discharge of a reasonable battery.
The battery management system BMS belongs to the prior art, and in the present embodiment, the battery management system BMS has a structure as shown in fig. 3 and includes a BMS controller, and the energy management system EMS is in communication connection with the BMS controller; the BMS controller is also connected with a voltage acquisition unit and a relay control unit, and is connected with an active front end AFE1 and an active front end AFE2 through a linear voltage stabilizer TPL, and the DC/DC controller is connected with the active front end.
The battery management system BMS detects battery performance parameters of a front-end acquisition power supply device through the active front-end AFE1 and the active front-end AFE2, and the voltage collector detects voltage parameters of the battery in real time; after the information is obtained, the charging and discharging of the battery are comprehensively analyzed for power management, so that the service life of the battery and the charging and discharging efficiency reach the optimal balance point. The service life of the battery is prolonged, and the operation cost is reduced.
In one embodiment, as shown in fig. 2, the DC/DC controller includes a Boost circuit, an input terminal of the Boost circuit is connected to the battery management system, an output terminal of the Boost circuit is connected to the DC bus, the Boost circuit includes a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a first diode D1, a second diode D2, a third diode D3, and a switching tube S, wherein the input terminal of the first inductor L1 is connected to an anode of the input terminal of the Boost circuit, and the output terminal of the first inductor L1 is connected to an anode of the first diode D1 and an anode of the second diode D2, respectively; the cathode of the first diode D1 is connected to one end of the second inductor L2 and one end of the first capacitor C1, respectively; the other end of the second inductor L2 is connected to the cathode of the second diode D2, the drain of the switching tube S, and the anode of the third diode D3, respectively; the cathode of the third diode D3 is connected to one end of the second capacitor C2 and the anode of the output terminal of the Boost circuit respectively; the other end of the first capacitor C1, the other end of the second capacitor C2 and the source electrode of the switching tube S are connected with the input end of the Boost circuit and the negative electrode of the output end of the Boost circuit, and the switching tube S is controlled by the energy management system EMS.
When the switch tube S is turned on, the first inductor L1 and the second inductor L2 store energy, and when the switch tube S is turned off, the power supply device, the first inductor L1 and the second inductor L2 discharge to the dc bus at the output end in common. By utilizing the double Boost cascade circuit, the voltage rise of the high-rate direct-current pump of more than 30 times can be realized, the low-voltage battery pack can provide power for the high-voltage bus, and therefore the aim of recycling the stored energy system is fulfilled, and the instant high-capacity quick charging technology and the instant high-energy charging technology of DC650V/50A/60s are provided. The energy management system EMS controls the on-off of the switch tube S through the level control signal, thereby controlling the electric energy transmission direction.
In one embodiment, the power supply device includes an emergency power supply EPS.
The emergency power source EPS comprises a storage battery, and in some embodiments, the storage battery is a ternary lithium battery or a lithium titanate battery, and has high power density and high charge and discharge current.
In this embodiment, the rectifying module in the driver is electrically connected to the DC BUS DC-BUS, and is configured to convert the ac power of the external power grid into the DC power in the DC BUS DC-BUS through full-wave rectification. Specifically, the rectification module is used to achieve full wave rectification of the three-phase AC 380V.
The inverter module in the drive, in some of its embodiments, is embodied as a pulse width modulation module PWM, for converting the DC current in the DC BUS DC-BUS to sinusoidal ac current and delivering it to the machine.
The elevator energy conversion system provided by the invention utilizes the battery management system to carry out charge and discharge management on the power supply device, utilizes the energy management system to receive power supply charge and discharge information sent by the battery management system in real time, simultaneously monitors voltage information on the direct current bus in real time, sends a control command to the DC/DC controller after comprehensive analysis and processing, realizes that the direct current bus charges the power supply device when the elevator is in power generation operation, discharges the electric energy stored by the power supply device to the direct current bus when the elevator is in power consumption operation, and finally realizes recycling of elevator feedback energy.
The invention also provides an elevator energy conversion method for the elevator energy conversion system, which comprises the following steps:
when the voltage of the direct current bus is larger than 540V, the energy management system controls the DC/DC controller to transfer the electric energy of the direct current bus into the power supply device;
when the voltage of the direct current bus is less than 540V, the energy management system controls the DC/DC controller to transfer the electric energy of the power supply device to the direct current bus.
In some embodiments, when the voltage of the DC BUS DC-BUS is greater than 540V, the energy management system EMS controls the DC/DC controller to transfer the electric energy of the DC BUS DC-BUS to the power supply device; when the voltage of the direct current bus is less than 540V, the energy management system controls the DC/DC controller to transfer the electric energy of the power supply device to the direct current bus comprises the following steps:
when the voltage of the direct current BUS DC-BUS is larger than or equal to 600V, the energy management system EMS controls the DC/DC controller to transfer the electric energy of the direct current BUS DC-BUS to the power supply device;
when the voltage of the direct current bus is smaller than or equal to 520V, the energy management system controls the DC/DC controller to transfer the electric energy of the power supply device to the direct current bus.
Considering the stability of the system, reducing the influence of the power grid voltage and preventing the elevator from consuming electric energy on the braking resistor when the direct current BUS voltage rises to DC670V, in some embodiments, when the voltage of the direct current BUS DC-BUS is set to be greater than or equal to 600V, the DC/DC controller is controlled to transfer the electric energy on the direct current BUS DC-BUS to the power supply device to realize energy storage; and meanwhile, in consideration of voltage fluctuation, when the voltage of the direct current BUS DC-BUS is set to be less than or equal to 520V for ensuring the action efficiency, the DC/DC controller is controlled to transfer the electric energy of the power supply device to the direct current BUS DC-BUS.
In some embodiments, the controlling, by the energy management system EMS, the DC/DC controller to transfer the power of the DC BUS DC-BUS to the power supply device when the voltage of the DC BUS DC-BUS is greater than 540V includes:
when the voltage of the DC-BUS is larger than 540V, the energy management system EMS further judges whether the electric quantity of the power supply device is not larger than an upper limit value, if so, the battery management system BMS outputs the charging voltage and the charging current required by the power supply device, and the energy management system EMS outputs a first level control signal to the DC/DC controller to control the DC-BUS to charge the power supply device.
In some embodiments, the controlling, by the energy management system EMS, the DC/DC controller to transfer the power of the power supply device to the DC BUS DC-BUS when the voltage of the DC BUS DC-BUS is less than 540V includes:
when the voltage of the DC-BUS is smaller than 540V, the energy management system EMS further judges whether the electric quantity of the power supply device is not smaller than a lower limit value, if so, the battery management system BMS outputs the discharge voltage and the discharge current required by the power supply device, and the energy management system EMS outputs a second level control signal to the DC/DC controller to control the power supply device to discharge to the DC-BUS.
Obviously, one of the first level control signal and the second level control signal is at a high level, and the other is at a low level.
Whether the electric quantity of the power supply is not larger than the upper limit value or not smaller than the lower limit value is further judged, so that the situation that when the direct current bus is needed to charge the power supply device, the power supply device is overcharged or when the power supply device is needed to discharge to the direct current bus, the power supply device is overdischarged is prevented, a power storage space is ensured when the power supply device needs to be charged, and the electric quantity is discharged when the power supply device needs to discharge, so that the electric energy application maximization is achieved. The upper limit value and the lower limit value of the power supply device power can be expressed in any form, such as specific power value, percentage, etc., as long as the power range can be limited, and it is understood that when expressed in percentage, the upper limit value should be less than 100%, and the lower limit value should be greater than 0.
As shown in fig. 4 and 5 in particular, in this embodiment, the elevator energy conversion system operates according to the following steps:
a. power supply device directional energyEMS (energy management System) sending power supply enabling signal EBatThe energy management system EMS judges the power supply enabling signal EBatIf the result is valid, if the result is invalid, directly ending and alarming, and if the result is valid, entering the step b;
b. battery management system BMS sends power supply capacity C to energy management system EMSBatThe energy management system EMS judges whether the power supply capacity is larger than or equal to a preset value, in the embodiment, the preset value is 50%, if not, the process is directly finished and an alarm is given, and if yes, the process enters the step c or the step d;
c. energy management system EMS (energy management system) real-time acquisition of voltage signal U on direct current BUS DC-BUSDC-BUSAccording to the voltage signal UDC-BUSDetermining the direction of energy transfer when UDC-BUSWhen the voltage is greater than or equal to 600V, further determining whether the power supply capacity Q is less than or equal to an upper limit value, which is set to 90% in this embodiment, the power supply capacity Q is sent to the energy management system EMS by the battery management system BMS; if yes, the battery management system BMS controls the charge and discharge enabling signal E of the power supply deviceOutEffective, output charging voltage U that DC bus needs to charge power supply unitBatAnd a charging current IBatGiving an energy management system EMS, outputting a first level control signal to a switching tube S in the DC/DC controller by the energy management system EMS, conducting the switching tube S, realizing that the DC-BUS charges the power supply device by the DC/DC controller, and then repeating the step c; otherwise, ending the charging.
d. Energy management system EMS (energy management system) real-time acquisition of voltage signal U on direct current BUS DC-BUSDC-BUSAccording to the voltage signal UDC-BUSDetermining the direction of energy transfer when UDC-BUSWhen the voltage is less than or equal to 520V, further determining whether the power supply electric quantity Q is not less than a lower limit value, which is set to 30% in this embodiment; if yes, the battery management system BMS controls the charge and discharge enabling signal E of the power supply deviceOutEffective, output power supply device needs discharge voltage U discharging to DC-BUSBatAnd discharge current IBatThe energy management system EMS outputs a second level control signal to a switching tube S in the DC/DC controller, the switching tube S is disconnected, and the DC/DC controller realizesD, discharging the voltage of the power supply device to the DC-BUS after the voltage of the power supply device is boosted, and then repeating the step d; otherwise, the discharge is ended.
The preset value of the power supply capacity and the upper limit value and the lower limit value of the power supply electric quantity can be other values.
If the power Q is greater than the upper limit but less than 100%, and the dc bus voltage is still greater than or equal to 600V, an emergency charging step e may be additionally added:
e. when U is turnedDC-BUSWhen the voltage is more than or equal to 600V, whether the electric quantity Q of the power supply is more than the upper limit value and less than 100 percent is further judged, if so, the battery management system BMS controls the charge-discharge enabling signal E of the power supply deviceOutEffective, output charging voltage U for DC-BUS requiring charging to power supply unitBatAnd a charging current IBatE, the energy management system EMS outputs a first level control signal to a switch tube S in the DC/DC controller, the switch tube S is conducted, the DC/DC controller realizes that the DC-BUS of the DC/DC controller charges the power supply device, and then the step e is repeated; otherwise, ending the emergency charging.
When the power Q is 100% and the dc bus voltage is still greater than or equal to 600V, the excess power is consumed by the resistance of the battery management system BMS.
The elevator energy conversion method provided by the invention automatically controls the direction of energy transmission of the DC/DC controller through the range of the bus voltage monitored by the energy management system in real time; the power supply device is charged or discharged outwards by limiting the electric quantity of the power supply not to be higher than the upper limit value or not to be lower than the lower limit value, so that the electric energy application is maximized, and the system is more stable in operation.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An elevator energy conversion system, comprising:
the driver comprises a rectifying module, an inverting module and a direct current bus;
a power supply device;
the battery management system is connected with the power supply device and is used for managing the power supply device;
the DC/DC controller is connected between the direct current bus of the driver and the battery management system and is used for controlling the direct current bus of the driver to charge the power supply device or discharging the power supply device to the direct current bus of the driver;
and the energy management system is connected with the direct current bus of the driver and the battery management system and controls the DC/DC controller.
2. The elevator energy conversion system of claim 1, wherein said energy management system obtains a voltage signal of said DC bus and controls said DC/DC controller to transfer power on said DC bus to said power supply unit when said DC bus voltage is greater than 540V; and when the voltage of the direct current bus is less than 540V, controlling the DC/DC controller to transfer the electric energy of the power supply device to the direct current bus.
3. The elevator energy conversion system according to claim 2, wherein the battery management system sends the power of the power supply device to the energy management system, when the voltage of the DC bus is greater than 540V and the power of the power supply device is not greater than an upper limit value, the battery management system outputs a charging voltage and a charging current required by the power supply device to the energy management system, and the energy management system outputs a first level control signal to the DC/DC controller to control the DC/DC controller to transfer the power on the DC bus to the power supply device; when the voltage of the direct current bus is less than 540V and the electric quantity of the power supply device is not less than a lower limit value, the battery management system outputs discharge voltage and discharge current required by the power supply device to the energy management system, the energy management system outputs a second level control signal to the DC/DC controller, and the DC/DC controller is controlled to transfer the electric energy of the power supply device to the direct current bus.
4. The elevator energy conversion system according to claim 1, wherein the DC/DC controller comprises a Boost circuit, an input end of the Boost circuit is connected to the battery management system, an output end of the Boost circuit is connected to the DC bus, the Boost circuit comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a first diode, a second diode, a third diode and a switching tube, wherein the input end of the first inductor is connected to an anode of the input end of the Boost circuit, and the output end of the first inductor is connected to an anode of the first diode and an anode of the second diode respectively; the cathode of the first diode is respectively connected with one end of the second inductor and one end of the first capacitor; the other end of the second inductor is respectively connected with the cathode of the second diode, the drain of the switching tube and the anode of the third diode; the cathode of the third diode is respectively connected with one end of the second capacitor and the anode of the output end of the Boost circuit; the other end of the first capacitor, the other end of the second capacitor and the source electrode of the switch tube are connected with the negative electrodes of the input end and the output end of the Boost circuit, and the switch tube is controlled to be switched on and off by the energy management system.
5. An elevator energy conversion system as defined in claim 1, wherein said power supply means includes an emergency power supply.
6. The elevator energy conversion system of claim 5, wherein the emergency power source comprises a battery, and the battery is a ternary lithium battery or a lithium titanate battery.
7. An elevator energy conversion method for use in an elevator energy conversion system according to any one of claims 1 to 6, the method comprising:
when the voltage of the direct current bus is larger than 540V, the energy management system controls the DC/DC controller to transfer the electric energy of the direct current bus into the power supply device;
when the voltage of the direct current bus is less than 540V, the energy management system controls the DC/DC controller to transfer the electric energy of the power supply device to the direct current bus.
8. The elevator energy conversion method according to claim 7, wherein the energy management system controls the DC/DC controller to transfer the electric power of the DC bus to the power supply device when the voltage of the DC bus is greater than 540V; when the voltage of the direct current bus is less than 540V, the energy management system controls the DC/DC controller to transfer the electric energy of the power supply device to the direct current bus comprises the following steps:
when the voltage of the direct current bus is larger than or equal to 600V, the energy management system controls the DC/DC controller to transfer the electric energy of the direct current bus into the power supply device;
when the voltage of the direct current bus is smaller than or equal to 520V, the energy management system controls the DC/DC controller to transfer the electric energy of the power supply device to the direct current bus.
9. The elevator energy conversion method of claim 7, wherein the controlling the DC/DC controller to transfer the power from the DC bus to the power device when the voltage of the DC bus is greater than 540V by the energy management system comprises:
when the voltage of the direct current bus is greater than 540V, the energy management system further judges whether the electric quantity of the power supply device is not greater than an upper limit value, if so, the battery management system outputs the charging voltage and the charging current required by the power supply device, and the energy management system outputs a first level control signal to the DC/DC controller to control the direct current bus to charge the power supply device.
10. The elevator energy conversion method of claim 7, wherein the controlling the DC/DC controller to transfer the power from the power supply device to the DC bus when the voltage of the DC bus is less than 540V by the energy management system comprises:
when the voltage of the direct current bus is less than 540V, the energy management system further determines whether the electric quantity of the power supply device is not less than a lower limit value, if so, the battery management system outputs a discharge voltage and a discharge current required by the power supply device, and the energy management system outputs a second level control signal to the DC/DC controller to control the power supply device to discharge to the direct current bus.
CN202111238731.6A 2021-10-25 2021-10-25 Elevator energy conversion system and conversion method thereof Pending CN113949056A (en)

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Publication number Priority date Publication date Assignee Title
CN1835329A (en) * 2006-04-10 2006-09-20 中国科学院电工研究所 Hybrid accumulator for elevator and control method thereof
CN206595914U (en) * 2017-03-20 2017-10-27 长沙理工大学 Elevator energy conversion control device
CN207069597U (en) * 2017-12-13 2018-03-02 隋俊珉 A kind of intelligent multi-function electric power system, elevator and steel mill oxygen lance electric power system
CN110071517A (en) * 2019-04-09 2019-07-30 柳州铁道职业技术学院 A kind of SCM Based lift energy feedback circuit and device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1835329A (en) * 2006-04-10 2006-09-20 中国科学院电工研究所 Hybrid accumulator for elevator and control method thereof
CN206595914U (en) * 2017-03-20 2017-10-27 长沙理工大学 Elevator energy conversion control device
CN207069597U (en) * 2017-12-13 2018-03-02 隋俊珉 A kind of intelligent multi-function electric power system, elevator and steel mill oxygen lance electric power system
CN110071517A (en) * 2019-04-09 2019-07-30 柳州铁道职业技术学院 A kind of SCM Based lift energy feedback circuit and device

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