CN107528383B - Super capacitor UPS power supply device for mine hoist - Google Patents
Super capacitor UPS power supply device for mine hoist Download PDFInfo
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- CN107528383B CN107528383B CN201710957957.9A CN201710957957A CN107528383B CN 107528383 B CN107528383 B CN 107528383B CN 201710957957 A CN201710957957 A CN 201710957957A CN 107528383 B CN107528383 B CN 107528383B
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Classifications
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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
- 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
- H02J9/062—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 AC powered loads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/32—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from a charging set comprising a non-electric prime mover rotating at constant speed
-
- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/40—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries adapted for charging from various sources, e.g. AC, DC or multivoltage
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- 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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention belongs to the field of mine hoist equipment, and provides a super capacitor UPS power supply device for a mine hoist, which comprises a frequency converter rectifying unit, a frequency converter bidirectional inversion unit, a unidirectional direct current voltage conversion unit, a first load conversion switch, a second load conversion switch, a super capacitor group unit, a super capacitor inversion unit and a detection control module, wherein the unidirectional direct current voltage conversion unit is connected with a direct current bus end of the frequency converter of the mine hoist and the super capacitor group unit, the super capacitor group unit is connected with the super capacitor inversion unit, and the super capacitor inversion unit is connected with a hoist control loop, a hoist room lighting device and an overhaul hoisting device through the first load conversion switch and the second load conversion switch respectively. The invention is energy-saving and environment-friendly, and can be widely applied to the field of mine hoists.
Description
Technical Field
The invention belongs to the field of mine hoist equipment, and particularly relates to a super capacitor UPS power supply device for a mine hoist.
Background
Mine hoist is widely used in mine well engineering equipment, is mainly responsible for lifting minerals, lifting personnel, materials, equipment and other tasks, is throat equipment of an electromechanical system of a mine, and is directly related to safe production of the mine. The UPS power supply device (namely, uninterrupted power supply device) matched with the elevator is key equipment for guaranteeing the safe operation of the elevator, and is a backup power supply for a main control system and a safe braking delay electromagnetic valve of the elevator in order to prevent the data loss of a control system of the elevator and to safely and reliably stop the elevator when the elevator cannot normally supply power due to power failure of a power grid or power supply system failure in normal use of the elevator. According to the requirements of the national 'coal mine safety regulations', when a mine hoist suddenly stops in case of power failure accidents, a brake firstly applies a first-stage braking moment, so that a lifting system generates deceleration conforming to the 'coal mine safety regulations', and the stable and reliable deceleration of the whole lifting system is ensured. And then the power is supplied by a standby power supply, and after a period of time delay (about 2-10 seconds, each specific time is different, the calculation is performed according to working conditions), the second-stage braking torque can be fully applied, so that the mine hoist is safely in a static parking state. In order to ensure the requirements, the delay time after power failure also needs to be provided with a standby power supply for a main control system of the elevator and a solenoid valve system of a hydraulic station part, so that the equipment can work normally in an electrified mode according to the technical requirements. Therefore, the mine hoist must be matched with a UPS power supply device meeting the requirements of a certain capacity and delay time, that is, a hoist must be equipped with a UPS power supply device. Particularly, when the elevator is used in an inclined shaft (particularly used on an inclined shaft with a small inclination angle), once a power supply system is suddenly powered off, if a backup power supply is not provided, an elevator control loop is lost, the elevator can not realize secondary braking, a first-stage emergency braking for applying full braking force can automatically occur to the elevator brake, the elevator is rapidly stopped under the action of the braking force, a container lifted in operation can continuously ascend for a certain distance under the action of inertia force, the lifting container and the elevator do not synchronously move, thus the rope loosening of a lifting steel wire rope connected with the two devices is caused, after the inertia of the upward operation of the lifting container is finished, the lifting container can freely move downwards under the action of the dead weight of the lifting container, the lifting steel wire rope bears larger impact tension, the steel wire rope is injured due to impact, and if the steel wire rope is damaged, the rope is possibly broken, so that the mine elevator flying machine is damaged. Therefore, when the safety braking is carried out, if the braking force with the three-fold static distance is input once according to the regulations of the safety code of the coal mine, the braking deceleration hardly accords with the regulations, and the braking deceleration is overlarge to a great extent. For a high-speed and high-inertia elevator, a large impact is caused to damage equipment. If the secondary braking is adopted, a part of braking torque is input into the primary braking, so that the braking deceleration meets the requirements of the coal mine safety regulations, and the secondary braking inputs all braking forces after time delay, thereby avoiding possible accidents of complaints. Thus, the safety is ensured, and the requirements of the coal mine safety regulations are met. The UPS power supply device is a 220V power supply for providing an electromagnetic compatibility index for the mine hoist under normal conditions, and more importantly, the UPS power supply device can provide backup electric energy with a certain time and a certain capacity for a hoist control system under the condition of power failure of the mine hoist so as to ensure that the mine hoist can implement delayed secondary braking under the condition of power failure and ensure safe operation of the mine hoist.
The UPS power supply device used by the existing mine hoist is a universal UPS power supply device on the market, and most of the UPS power supply device is a constant-voltage constant-frequency uninterrupted power supply with a lead-acid battery energy storage device and an inverter as a main component. When the mains supply is normally input, the UPS power supply device stabilizes the mains supply and supplies the stabilized mains supply to a load for use, and the UPS power supply device is an alternating current mains supply voltage stabilizer and charges an internal lead-acid battery; when the commercial power is interrupted (accident power failure), the UPS power supply device immediately supplies 220V alternating current to the load by the electric energy stored in the lead-acid battery in the machine through an inversion conversion method, so that the load keeps normal work and soft and hardware of the load are protected from damage. At present, the energy storage element of the uninterruptible power supply device adopts lead-acid batteries, however, the pollution caused by the production process and subsequent recovery of the lead-acid batteries is very serious, the lead-acid batteries also have memory effect and poor electricity storage efficiency, and the average service life of the energy storage element is about (2-3) years, if users cannot maintain and replace the device in time, the safe operation of a lifting machine cannot be effectively ensured, in addition, the batteries cannot be stored for a long time, the battery charging and discharging maintenance should be carried out manually and regularly for a long time, the original performance cannot be recovered when the lead-acid batteries are in shortage of electricity, and the lead-acid batteries need to be recovered when in abandonment, otherwise, the energy storage element can cause environmental pollution, and meanwhile, the batteries also have certain requirements on the environmental temperature. That is, the lead-acid battery UPS power supply apparatus is not suitable for the current national green, environment-friendly, high-quality, efficient, energy-saving and safe production requirements due to the problems of high pollution, short service life, low reliability and the like caused by the lead-acid battery, and the lithium battery UPS power supply apparatus is much better than the lead-acid battery UPS power supply apparatus, but has poor high-temperature working characteristics (easy explosion) and high price, which restricts the use of the lithium battery UPS power supply apparatus on the UPS power supply apparatus. Therefore, a novel UPS power supply device for the mine hoist, which is green, environment-friendly, high-quality, efficient, energy-saving and meets the safety production requirements, needs to be developed.
The working principle of the frequency converter of the mine hoist is shown in figure 1. The mine hoist load is a constant torque characteristic load. When the heavy vehicle goes up, the electromagnetic torque of the motor must overcome the load resistance torque, and must overcome a certain static friction torque when starting, and the motor is in an electric working state and works in a first quadrant. When the heavy vehicle is decelerating, the motor is in a regeneration state and works in the second quadrant. When another train of heavy vehicles ascends, the motor is in a reverse electric state and works in a third quadrant and a fourth quadrant. In addition, when the tool or equipment is transported downhole alone, which is about 10% of the total operating time, the motor is purely in the second or fourth quadrant, and the motor is in a regeneration state for a long time, so that effective braking is required. The energy consumption braking mode is used for consuming a great amount of electric energy; this portion of the power can be saved by the feedback braking mode. However, the energy of the regenerative braking belongs to a contaminated power source, which is generally not allowed by the power sector. For this purpose, the elevator adopts a low-cost braking scheme of adding energy consumption resistors to the energy consumption braking units. The mode of the frequency converter with the brake unit shown in fig. 1 is the mode with the most used frequency conversion speed regulation of the mine hoist. That is, the operation process of the elevator is the process of converting electric energy and mechanical energy, when the elevator is in heavy load ascending or light load descending, energy needs to be provided for the elevator to increase mechanical potential energy, the elevator converts the electric energy into the mechanical potential energy, the elevator is in an electric power consumption state, a three-phase alternating current power supply is changed into direct current through a frequency converter rectifying unit 1, and the direct current is converted into three-phase alternating current with adjustable frequency and voltage through a frequency converter inverter 2 to drive a motor to operate; when the light load of the elevator goes up or the heavy load goes down, the mechanical potential energy needs to be reduced in the operation process, the mechanical potential of the elevator is converted into electric energy, and the motor is in a power generation state. In addition, the process from high-speed operation to braking and stopping of the elevator is a mechanical kinetic energy consumption process, wherein a part of kinetic energy is converted into electric energy through the elevator, and the motor is in a power generation process. In both cases, the electric energy generated in the motor power generation process can be reversely returned to the variable-frequency direct-current end through the three-phase inverter bridge of the frequency converter, the generated electric energy of the elevator motor 6 is returned to the two ends of the filter capacitor 12 through the frequency converter inverter 2 and is stored in the direct-current filter capacitor C, the capacity of the direct-current capacitor is limited, and when the electric energy generated by the motor is large enough, the capacity of the direct-current capacitor is exceeded, the direct-current capacitor is damaged, so that more electric energy must be consumed. The conventional method for processing the electric energy of the frequency conversion elevator is to additionally install a braking unit 4 comprising a braking resistor at the end of the direct current capacitor, and when the voltage at the two ends of the capacitor reaches a certain value, the braking unit 4 acts, and the redundant electric energy is converted into heat energy through the braking resistor to be emitted into the air. The mine hoist is operated about 300 times a day, and a lot of power generation energy is generated after each operation, and the power generation energy is discharged through the brake unit.
For the above reasons, there is a need to develop a UPS power supply apparatus having an energy-saving effect while a non-lead-acid battery type chemical change energy storage device is being developed.
Disclosure of Invention
The invention overcomes the defects existing in the prior art, and solves the technical problems that: the super capacitor UPS power supply device for the mine hoist is energy-saving and environment-friendly, and the reliability of a safety braking system of the mine hoist is improved.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a mine winder is with super capacitor UPS power supply unit, includes converter rectification unit, converter bidirectional inverter unit, one-way direct current voltage conversion unit, first load change over switch, second load change over switch, super capacitor group unit, super capacitor inversion unit and detection control module, external power supply is connected with the mine winder motor after the converter rectification unit, converter inversion unit, the input of one-way direct current voltage conversion unit is connected with mine winder converter direct current generating line end, the output with the input of super capacitor group unit is connected, the output of super capacitor group unit with super capacitor inversion unit's input is connected, super capacitor inversion unit's output is connected with the lifting machine control loop through first load change over switch unit, is connected with hoist computer lab lighting equipment and maintenance hoisting equipment through second load change over switch; the single-phase direct-current voltage conversion unit is used for converting direct-current voltage of a direct-current bus end and then charging the super capacitor bank unit, and the super capacitor inversion unit is used for converting a direct-current power supply output by the super capacitor bank unit into 220V alternating current and then supplying power to the elevator control loop, the elevator machine room lighting equipment and the overhaul lifting equipment; the data output end of the super capacitor bank unit is connected with the input end of the detection control module and is used for providing voltage data for the detection control module; the first output end of the detection control module is connected with the control end of the unidirectional direct-current voltage conversion unit, the second output end of the detection control module is connected with the control end of the super capacitor inversion unit, the third output end and the fourth output end of the detection control module are respectively connected with the control ends of the first load change-over switch and the second load change-over switch, a charging control program and a discharging control program are arranged in the detection control module, and the detection control module is used for controlling the working states of the unidirectional direct-current voltage conversion unit and the super capacitor inversion unit and the connection states of the first load change-over switch and the second load change-over switch through the charging control program and the discharging control program, so that the charging and discharging states of the super capacitor group unit are controlled.
The utility model provides a mine winder is with super capacitor UPS power supply unit, still include busbar end voltage detection unit, busbar end voltage detection unit's output is connected with detection control module for detect the voltage of mine winder converter direct current busbar end and send for detection control module, the control program that charges includes the following steps:
s101, judging whether a mine hoist motor is in a regeneration power generation state according to a detection signal of a bus end voltage detection unit; if yes, go to step S102; if not, repeating the step S101;
s102, judging whether the voltage of the super capacitor bank unit is smaller than a first set value U1, if so, entering a step S103, and if not, repeating the step S102;
s103, controlling the unidirectional direct-current voltage conversion unit 7 to work, charging the super capacitor bank unit 8, and entering a step S104;
and S104, judging whether the voltage of the super capacitor bank unit reaches the rated voltage, if so, controlling the unidirectional direct current voltage conversion unit 7 to stop working after delaying for 10 seconds, and if not, repeatedly entering the step S103.
The first set value U1 is 0.95 times of rated voltage of the super capacitor bank unit.
The super capacitor UPS power supply device for the mine hoist further comprises a pre-charging unit, wherein the input end of the super capacitor group unit is connected with an external power supply through the pre-charging unit, the pre-charging unit is used for converting the voltage of the external power supply into the voltage required by the super capacitor group unit and charging the super capacitor group, the output end of the detection control module is connected with the control end of the pre-charging unit, and the detection control module is used for controlling the pre-charging unit to work and directly charge the super capacitor group unit when the voltage value of the super capacitor group unit is lower than a fourth set value.
And the fourth set value is 0.1 time of rated voltage of the super capacitor bank unit.
The discharge control program includes the steps of:
s201, judging whether an external power supply has sudden faults, if yes, controlling the super capacitor inversion unit to work, simultaneously controlling the first load switch to enable a hoist control loop to be connected with the super capacitor inversion unit, controlling the second load switch to cut off the connection of the hoisting equipment and the maintenance hoisting equipment of the hoisting machine room and the super capacitor inversion unit, and if no, entering step S202;
s202, judging the relation between the voltage of the super capacitor bank unit and the second set value U2 and the third set value U3, if the voltage is smaller than the second set value U2, controlling the super capacitor inverter unit to stop working, and simultaneously switching the second load switch to enable the elevator room lighting equipment and the overhaul lifting equipment to be connected with an external power supply; simultaneously returning to step S201; if the value is greater than or equal to the second set value U2 and less than or equal to the third set value U3, the operation is not performed, and meanwhile, the step S1 is returned; and if the load is larger than the third set value, controlling the super capacitor inverter unit to work, simultaneously switching the second load switch to enable the lifting machine room lighting equipment and the overhauling lifting equipment to be connected with the super capacitor bank unit, and returning to the step S201.
The electric quantity of the super capacitor bank unit corresponding to the second set value U2 is 1.5 times of the energy required by the delay of 5 minutes of the mine hoist control loop; the third set value U3 is 0.8 times of rated voltage of the super capacitor bank unit.
The super capacitor UPS power supply device for the mine hoist further comprises a braking unit, wherein the braking unit is connected with a direct current bus end of a frequency converter of the hoist, the output end of the detection control module is connected with the control end of the braking unit and is used for controlling the braking unit to work when the mine hoist motor is in a regeneration state and the electric quantity of the super capacitor bank unit reaches a full value.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the unidirectional direct-current voltage conversion unit and the super capacitor bank unit are arranged at the bus end of the frequency converter of the elevator, the super capacitor inversion unit and the load change-over switch are arranged between the super capacitor bank unit and the load, and when the motor of the elevator is positioned in the regeneration device, the unidirectional direct-current voltage conversion unit is controlled to charge the super capacitor bank unit; when the voltage of the super capacitor bank unit reaches a certain value, controlling the second load switch conversion unit to enable the super capacitor bank unit to supply power to the machine room lighting equipment and the overhaul lifting equipment; when an external power supply fault occurs, the first load switch is controlled to be switched to the standby power supply end, so that the super capacitor bank unit discharges to supply power to the elevator control loop, on one hand, the energy stored by the super capacitor bank unit can be further used for lifting the power supply of the machine room lighting equipment and overhauling the lifting equipment, the load potential energy of the elevator is improved, the utilization rate of the energy fed back by the decelerating brake is improved, the purpose of energy saving is achieved, meanwhile, pollution of the fed back braking energy to a power grid is avoided, and on the other hand, the requirement of the mine elevator on the standby power supply during power failure is met. In addition, the arrangement of the detection control module enables the charging and discharging process of the super capacitor UPS power supply device to be automatically controlled in real time, and the operation reliability of the mine hoist is greatly improved.
Drawings
FIG. 1 is a schematic diagram of the operation of a prior art mine hoist inverter;
fig. 2 is a schematic structural diagram of a super capacitor UPS power supply device for a mine hoist according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a charging control procedure according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a discharging control program according to an embodiment of the present invention;
fig. 5 is a working schematic diagram of a super capacitor UPS power supply device for a mine hoist according to an embodiment of the present invention;
fig. 6 is a flowchart of a discharging control procedure according to another embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 2, the embodiment of the invention provides a super capacitor UPS power supply device for a mine hoist, which comprises a frequency converter rectifying unit 1, a frequency converter bidirectional inversion unit 2, a unidirectional direct current voltage conversion unit 7, a first load conversion switch 11, a second load conversion switch 12, a super capacitor bank unit 8, a super capacitor inversion unit 9 and a detection control module 3, wherein an external power supply is connected with a mine hoist motor 6 after passing through the frequency converter rectifying unit 1 and the frequency converter bidirectional inversion unit 2, the input end of the unidirectional direct current voltage conversion unit 7 is connected with a mine hoist frequency converter direct current bus terminal 10, the output end is connected with the input end of the super capacitor bank unit 8, the output end of the super capacitor bank unit 8 is connected with the input end of the super capacitor inversion unit 9, the output end of the super capacitor inversion unit 9 is connected with a hoist control loop 13 through the first load conversion switch 11, is connected with a hoist room lighting device and a maintenance lifting device 14 through the second load conversion switch 12, and the hoist control loop 13 is also connected with the lighting device through the first load conversion unit 11 and the maintenance device through the second load conversion switch 14; the single-phase direct-current voltage conversion unit 7 is used for converting the direct-current voltage of the direct-current bus end 10 and then charging the super capacitor bank unit 8, and the super capacitor inversion unit 9 is used for converting the direct-current power supply output by the super capacitor bank unit 8 into 220V alternating current and then supplying power to the elevator control loop, the elevator room lighting equipment and the overhaul lifting equipment 14. The unidirectional direct-current voltage conversion unit is a unidirectional DC/DC module.
The data output end of the super capacitor bank unit 8 is connected with the input end of the detection control module 3 and is used for providing voltage data for the detection control module 3; the first output end of the detection control module 3 is connected with the control end of the unidirectional direct-current voltage conversion unit 7, the second output end of the detection control module 3 is connected with the control end of the super capacitor inversion unit 9, the third output end and the fourth output end of the detection control module 3 are respectively connected with the control ends of the first load conversion switch 11 and the second load conversion switch 12, and the detection control module 3 is used for controlling the charge and discharge states of the super capacitor bank unit by controlling the working states of the unidirectional direct-current voltage conversion unit 7 and the super capacitor inversion unit 9 and controlling the connection states of the first load conversion switch 11 and the second load conversion switch 12.
Specifically, the detection control module 3 is configured to control the unidirectional dc voltage conversion unit 7 to work when the mine hoist motor 6 is in a regenerative power generation state and the voltage value of the supercapacitor group unit is low, and control the unidirectional dc voltage conversion unit 7 to stop working when the supercapacitor group unit 3 is charged until the voltage of the supercapacitor group unit reaches the rated voltage; the detection control module 3 is further configured to control the super capacitor inverter unit 9 to work when the capacitance of the super capacitor bank unit is sufficient, and control the second load change-over switch, so that the lifting machine room lighting device and the maintenance lifting device 14 are switched to be connected with the super capacitor inverter unit 9 to obtain electric energy; in addition, the detection control module 3 is further configured to control the supercapacitor inverter unit 9 to work and control the first load change-over switch 11 when the emergency power supply fails, so that the elevator control loop 13 is switched to be connected with the supercapacitor group inverter unit 9 to obtain electric energy, and the supercapacitor group unit 8 discharges to supply power to the elevator control loop 13.
Further, the super capacitor UPS power supply device for the mine hoist further comprises a bus end voltage detection unit 15 connected with the direct current bus end of the mine hoist frequency converter, wherein the output end of the bus end voltage detection unit 15 is connected with the detection control module 3 and is used for detecting the voltage of the direct current bus end of the mine hoist frequency converter and sending the voltage to the detection control module; the detection control module 3 is provided with a charging control program and a discharging control program, as shown in fig. 3, the charging control program includes the following steps:
s101, judging whether a mine hoist motor is in a regeneration power generation state according to a detection signal of a bus end voltage detection unit; if yes, go to step S102; if not, repeating the step S101;
s102, judging whether the voltage of the super capacitor bank unit is smaller than a first set value U1, if so, entering a step S103, and if not, repeating the step S102;
s103, controlling the unidirectional direct-current voltage conversion unit 7 to work, charging the super capacitor bank unit 8, and entering a step S104;
and S104, judging whether the voltage of the super capacitor bank unit reaches the rated voltage, if so, delaying for 10 seconds, and controlling the unidirectional direct current voltage conversion unit 7 to stop working, and if not, repeating the step S103.
The first set value U1 may be 0.95 times the rated voltage of the supercapacitor group unit, and since the charging time of the supercapacitor is extremely short, the supercapacitor group unit is charged only when the voltage is lower than the first set value U1 through the charging control program, and the supercapacitor group unit can be directly charged once being charged, so that frequent operation of the unidirectional direct current voltage conversion unit 7 can be avoided, and the failure rate of the device is reduced.
As shown in fig. 4, the discharge control program includes the steps of:
and S201, judging whether an external power supply has sudden faults, if yes, controlling the super capacitor inversion unit to work, simultaneously controlling the first load switch to enable a hoist control loop to be connected with the super capacitor inversion unit, controlling the second load switch to cut off the connection of the lifting machine room lighting equipment and the overhaul lifting equipment with the super capacitor inversion unit, and if no, entering step S202.
S202, judging the relation between the voltage of the super capacitor bank unit and the second set value U2 and the third set value U3, if the voltage is smaller than the second set value U2, controlling the super capacitor inverter unit to stop working, and simultaneously switching the second load switch to enable the elevator room lighting equipment and the overhaul lifting equipment to be connected with an external power supply; simultaneously returning to the step S1; if the value is greater than or equal to the second set value U2 and less than or equal to the third set value U3, the operation is not performed, and meanwhile, the step S1 is returned; and if the load is larger than the third set value, controlling the super capacitor inverter unit to work, simultaneously switching the second load switch to enable the lifting machine room lighting equipment and the overhauling lifting equipment to be connected with the super capacitor bank unit, and returning to the step S201.
The detection control unit can be connected with a monitoring device of the external power supply so as to monitor the working state of the external power supply at any time, so that the super capacitor bank unit is switched to discharge to supply power to the elevator control loop in a delayed manner when a sudden fault occurs, and the safety of the elevator is guaranteed.
The second set value U2 may be set according to the capacitance value of the supercapacitor unit and the value of energy required by 5 minutes of delay of the mine hoist control circuit, and if the energy stored in the supercapacitor unit corresponding to the second set value U2 should meet the energy required by 5 minutes of delay of the mine hoist control circuit, so as to ensure that the emergency power failure can ensure that the mine hoist control circuit can work for more than 5 minutes in any situation, and the third set value U3 should be greater than the second set value U2, so that the supercapacitor unit supplies power to the elevator room lighting device and the overhaul lifting device under the condition of sufficient electric quantity, thereby improving the load potential energy of the elevator and the utilization rate of the energy fed back by deceleration braking. Preferably, the electric quantity of the super capacitor unit corresponding to the second set value U2 is 1.5 times of the energy required by 5 minutes of the delay of the mine hoist control loop, and the electric quantity of the super capacitor unit can be calculated by the formula e=cu 2 And/2, calculating, wherein C is a capacitance value, U is a voltage value and E is an electric quantity; the third set value U3 may be set to be 0.8 times the rated voltage U0 of the supercapacitor group unit.
Furthermore, the super capacitor UPS power supply device for a mine hoist according to the embodiment of the present invention may further include a brake unit 4, where the brake unit 4 is connected to a dc bus terminal 10 of a hoist inverter, and the output end of the detection control module 3 is further connected to a control end of the brake unit 4, so as to control the brake unit 4 to operate when the mine hoist motor 6 is in a regenerative power generation state and the capacitance of the super capacitor bank unit 8 reaches a full value, so as to consume redundant feedback electric energy. The braking unit is internally provided with a braking resistor, when the super capacitor bank unit is fully charged and the mine hoist motor 6 is still in a regeneration state, the energy indicating the hoist load potential energy and deceleration braking feedback is converted into more three-phase alternating current energy through the hoist motor 6, and the three-phase alternating current energy is difficult to be completely stored through the super capacitor bank unit, at the moment, the detection control module 3 controls the braking unit 4 to act, and redundant electric energy can be converted into heat energy through the braking resistor and emitted into the air, so that the energy is consumed, and pollution to a power grid is avoided.
As shown in fig. 5, the working principle of the super capacitor UPS power supply device for a mine hoist of the present invention is as follows: when the elevator operates, the load potential energy of the elevator and the energy fed back by the decelerating brake are converted into three-phase alternating current energy through the elevator motor 6, and then converted into direct current through the bidirectional inversion unit loop 2 of the frequency converter to be recovered to the direct current bus end of the frequency converter, the input end of the unidirectional direct current voltage conversion unit 7 is connected with the direct current bus end, and the output end is connected with the super capacitor bank unit 8, so that the unidirectional direct current voltage conversion unit 7 charges the super capacitor bank unit 8 under the control of the detection control module 3; in addition, the output end of the super capacitor bank unit 8 is connected with the super capacitor inversion unit 9, and under the control of the detection control module, the super capacitor inversion unit 9 can convert a direct current power supply output by the super capacitor into a 220V standard alternating current power supply, and the 220V alternating current power supply is connected with the elevator control loop through the load change-over switch to supply power to the elevator control loop.
Further, as another embodiment of the present invention, the super capacitor UPS power supply device for a mine hoist may further include a pre-charging unit 5, an input end of the super capacitor bank unit 8 is further connected to an external power supply through the pre-charging unit 5, an output end of the detection control module 3 is further connected to a control end of the pre-charging unit 5, the pre-charging unit 5 is configured to convert an external power supply voltage into a voltage required by the super capacitor bank unit 8 and charge the super capacitor bank unit 8, and the detection control module 3 is configured to control the pre-charging unit 5 to operate and charge the super capacitor bank unit 8 when a voltage value of the super capacitor bank unit 8 is lower than a fourth set value U4. By arranging the pre-charging unit, the super capacitor bank unit can be pre-charged in a state that the stored charge is zero due to the reason that the super capacitor bank unit is electrified for the first time or stored for a long time, and the frequency converter is prevented from being damaged.
Specifically, as shown in fig. 6, a flowchart of a charging control procedure in the present embodiment includes the following steps:
s301, judging whether the voltage of the super capacitor group is smaller than a fourth set value U4, if so, entering a step S301, and if not, entering a step S304;
s302, controlling the pre-charging unit 5 to work, charging the super capacitor bank unit 8, and entering step S303;
s303, judging whether the voltage of the super capacitor bank unit reaches the rated voltage, if not, repeating the step S302, and if so, controlling the pre-charging unit 5 to stop working after delaying for 10 seconds;
s304, judging whether the mine hoist motor is in a regeneration state or not according to a detection signal of the bus end voltage detection unit, and judging whether the voltage of the super capacitor group unit is smaller than a first set value U1 or not; if yes, go to step S305; if not, repeating the step S304;
s305, controlling the unidirectional direct-current voltage conversion unit 7 to work, charging the super capacitor bank unit 8, and entering step S306;
and S306, judging whether the unit voltage of the super capacitor bank reaches the rated voltage, if not, repeating the step S305, and if so, controlling the unidirectional direct current voltage conversion unit 7 to stop working after delaying for 10 seconds.
Specifically, the fourth set value U4 may be set to 10% of the rated voltage of the supercapacitor group unit.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. The super capacitor UPS power supply device for the mine hoist is characterized by comprising a frequency converter rectifying unit, a frequency converter bidirectional inversion unit, a unidirectional direct current voltage conversion unit, a first load change-over switch, a second load change-over switch, a super capacitor group unit, a super capacitor inversion unit and a detection control module, wherein an external power supply is connected with a mine hoist motor after passing through the frequency converter rectifying unit and the frequency converter inversion unit, the input end of the unidirectional direct current voltage conversion unit is connected with a direct current bus end of the mine hoist frequency converter, the output end of the unidirectional direct current voltage conversion unit is connected with the input end of the super capacitor group unit, the output end of the super capacitor group unit is connected with the input end of the super capacitor inversion unit, and the output end of the super capacitor inversion unit is connected with a hoist control loop through the first load change-over switch unit and is connected with a lifting machine room lighting device and an overhaul lifting device through the second load change-over switch; the one-way direct-current voltage conversion unit is used for converting direct-current voltage of a direct-current bus end to charge the super capacitor bank unit, and the super capacitor inversion unit is used for converting a direct-current power supply output by the super capacitor bank unit into 220V alternating current to supply power to the elevator control loop, the elevator machine room lighting equipment and the overhaul lifting equipment;
the data output end of the super capacitor bank unit is connected with the input end of the detection control module and is used for providing voltage data for the detection control module; the first output end of the detection control module is connected with the control end of the unidirectional direct-current voltage conversion unit, the second output end of the detection control module is connected with the control end of the super capacitor inversion unit, the third output end and the fourth output end of the detection control module are respectively connected with the control ends of the first load change-over switch and the second load change-over switch, a charging control program and a discharging control program are arranged in the detection control module, and the detection control module is used for controlling the working states of the unidirectional direct-current voltage conversion unit and the super capacitor inversion unit and the connection states of the first load change-over switch and the second load change-over switch through the charging control program and the discharging control program, so as to control the charging and discharging states of the super capacitor group unit;
the discharge control program includes the steps of:
s201, judging whether an external power supply has sudden faults, if yes, controlling the super capacitor inversion unit to work, simultaneously controlling the first load switch to enable a hoist control loop to be connected with the super capacitor inversion unit, controlling the second load switch to cut off the connection of the hoisting equipment and the maintenance hoisting equipment of the hoisting machine room and the super capacitor inversion unit, and if no, entering step S202;
s202, judging the relation between the voltage of the super capacitor bank unit and the second set value U2 and the third set value U3, if the voltage is smaller than the second set value U2, controlling the super capacitor inverter unit to stop working, and simultaneously switching the second load switch to enable the elevator room lighting equipment and the overhaul lifting equipment to be connected with an external power supply; simultaneously returning to step S201; if the value is greater than or equal to the second set value U2 and less than or equal to the third set value U3, the operation is not performed, and meanwhile, the step S1 is returned; and if the load is larger than the third set value, controlling the super capacitor inverter unit to work, simultaneously switching the second load switch to enable the lifting machine room lighting equipment and the overhauling lifting equipment to be connected with the super capacitor bank unit, and returning to the step S201.
2. The super capacitor UPS power supply device for a mine hoist according to claim 1, further comprising a bus end voltage detection unit, wherein an output end of the bus end voltage detection unit is connected to a detection control module, and is configured to detect a voltage of a dc bus end of a frequency converter of the mine hoist and send the detected voltage to the detection control module, and the charging control program includes the following steps:
s101, judging whether a mine hoist motor is in a regeneration power generation state according to a detection signal of a bus end voltage detection unit; if yes, go to step S102; if not, repeating the step S101;
s102, judging whether the voltage of the super capacitor bank unit is smaller than a first set value U1, if so, entering a step S103, and if not, repeating the step S102;
s103, controlling the unidirectional direct-current voltage conversion unit 7 to work, charging the super capacitor bank unit 8, and entering a step S104;
and S104, judging whether the voltage of the super capacitor bank unit reaches the rated voltage, if so, controlling the unidirectional direct current voltage conversion unit 7 to stop working after delaying for 10 seconds, and if not, repeatedly entering the step S103.
3. The super capacitor UPS power supply device for a mine hoist according to claim 2, wherein the first set value U1 is 0.95 times the rated voltage of the super capacitor bank unit.
4. The super capacitor UPS power supply device for the mine hoist according to claim 1, further comprising a pre-charging unit, wherein the input end of the super capacitor group unit is further connected with an external power supply through the pre-charging unit, the pre-charging unit is used for converting the external power supply voltage into the voltage required by the super capacitor group unit and charging the super capacitor group, the output end of the detection control module is connected with the control end of the pre-charging unit, and the detection control module is used for controlling the pre-charging unit to work and directly charge the super capacitor group unit when the voltage value of the super capacitor group unit is lower than a fourth set value.
5. The super capacitor UPS power supply apparatus for a mine hoist as claimed in claim 4, wherein the fourth set value is 0.1 times the rated voltage of the super capacitor bank unit.
6. The super capacitor UPS power supply device for the mine hoist according to claim 1, wherein the electric quantity of the super capacitor unit corresponding to the second set value U2 is 1.5 times of the energy required by the delay of 5 minutes of the mine hoist control loop; the third set value U3 is 0.8 times of rated voltage of the super capacitor bank unit.
7. The super capacitor UPS power supply device for the mine hoist according to claim 1, further comprising a brake unit, wherein the brake unit is connected with a DC bus of a frequency converter of the hoist, and the output end of the detection control module is connected with the control end of the brake unit and is used for controlling the brake unit to work when the mine hoist motor is in a regeneration state and the electric quantity of the super capacitor bank unit reaches a full value.
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| CN109412498A (en) * | 2018-03-06 | 2019-03-01 | 埃斯倍风电科技(青岛)有限公司 | A kind of frequency converter and its DC bus charging method without external braking resistor |
| CN108726311B (en) * | 2018-06-01 | 2023-09-01 | 快意电梯股份有限公司 | Elevator emergency self-rescue system and upright elevator |
| CN111017657B (en) * | 2019-12-02 | 2022-09-02 | 日立电梯（中国）有限公司 | Elevator operation control method, device, system, computer equipment and storage medium |
| CN114598186B (en) * | 2020-12-07 | 2023-12-15 | 南京泉峰科技有限公司 | Electric tool and electric tool starting method |
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