CN106385101B - Method and device for realizing power supply of high-power elevator automatic rescue device - Google Patents
Method and device for realizing power supply of high-power elevator automatic rescue device Download PDFInfo
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- CN106385101B CN106385101B CN201610844377.4A CN201610844377A CN106385101B CN 106385101 B CN106385101 B CN 106385101B CN 201610844377 A CN201610844377 A CN 201610844377A CN 106385101 B CN106385101 B CN 106385101B
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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
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
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- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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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
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Elevator Control (AREA)
Abstract
The embodiment of the invention discloses a method and a device for realizing power supply of a high-power elevator automatic rescue device, wherein the method comprises the following steps: detecting whether an external power accessed by the elevator is normal or not based on a power grid detection module in the elevator, disconnecting a contactor on the external power grid when the external power is detected to be abnormal, and supplying power to the elevator by adopting a standby power supply in an automatic rescue device, wherein the standby power supply in the automatic rescue device adopts a low-voltage battery pack; in the process of supplying power by adopting a standby power supply in the automatic rescue device, controlling the standby power supply to complete boosting processing through a three-phase six-bridge-arm staggered parallel DCDC boosting module; and outputting the boosted current and voltage to an inverter module. In the embodiment of the invention, the direct current high voltage existing for a long time in the existing device is eliminated; the low-voltage battery pack is used for replacing a small-capacity high-voltage battery, the battery performance is improved, higher output power and impulse current energy resistance are realized, and the elevator automatic rescue device is suitable for automatic rescue operation of medium and large elevators with power of 40kW and above.
Description
Technical Field
The invention relates to the technical field of elevators, in particular to a method and a device for realizing power supply of a high-power automatic elevator rescue device.
Background
Fig. 1 shows a schematic structural diagram of an existing direct-power type middle-or large-sized power elevator automatic rescue device, a corresponding automatic rescue device is arranged between an external power grid and an elevator, when commercial power is supplied normally, a main control template controls and connects an external broken grid and an electric shock device of an elevator room to realize circuit connection, the external power grid supplies power, when the commercial power cannot supply power normally, a main control module controls and connects the external broken grid and the electric shock device of the elevator room to disconnect, and a standby power supply and the electric shock device of the elevator are connected to realize circuit connection and are supplied power by the standby power supply. The main control module is triggered to send out a corresponding control instruction through power grid detection, and when the standby power supply supplies power, the control output of the discharge management module is passed through, and then the inversion processing is realized by the inversion module and is input to the elevator.
At present, a high-voltage battery pack is generally used for directly inverting and outputting to supply power to an elevator, and the high-voltage battery pack generally comprises a small-capacity high-voltage battery pack, a battery pack charging and charging management module, a pre-starting control module, an inverting module, a direct-current bus discharging resistor and control module, a main control module and a human-computer interface. At present, lead-acid batteries or lithium batteries and the like which are commonly used in the market are complicated in charging management and discharging management after being connected in series into a high-voltage battery pack, and the service life and the reliability are difficult to guarantee; the presence of high dc voltage in the system makes maintenance more difficult.
The high-power high-speed passenger elevator automatic rescue device on the market at present usually adopts 40-48 batteries of 7AH to connect in series to form a battery pack and invert the battery pack into a three-phase four-wire AC380V, the maximum output power of the device changes with the residual electric quantity of the batteries and is usually about 10-12 kW, and the shock spike resistance is usually determined by a super capacitor on a direct-current bus; the disadvantages mainly include: the output voltage range of the battery pack is DC 480V-DC 660V by taking the battery pack with 48 batteries connected in series as an example, the inverter module needs to output voltage stabilization and needs to adapt to a very large regulation range, and the harmonic distortion of the output voltage can be increased by the overlarge regulation depth; the automatic rescue device can only depend on the over-current capacity of a battery or be realized by adopting a battery with larger capacity, and a high-quality lead-acid battery can only support 3C discharge at the maximum; excessive cell series complicates battery charge and discharge management and increases the probability of a single cell failure causing the entire battery pack to fail.
At present conventional high-power elevator direct power supply type automatic rescue device that has a power failure usually adopts the direct contravariant of high-voltage battery to produce the voltage that needs, use the high-voltage battery group in this mode, charge and discharge management is complicated, the battery performance is poor, and is bulky, because the high-voltage battery group is direct to elevator power supply generally, the magnitude of voltage that high-power elevator needs is more than 380V, the voltage of group battery exceedes human safe voltage greatly, make battery replacement with high costs, and because there is uncontrolled direct current high pressure to persist and produce the potential safety hazard easily when leading to production installation and battery to maintain. The direct supply type power failure automatic rescue device used by the conventional medium-low power elevator cannot be used in a high-power elevator due to the reasons of output power, impulse current and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method and a device for supplying power to a high-power elevator automatic rescue device, which realize that a low-voltage battery pack is matched with and replaces a high-voltage battery pack of the original high-power elevator automatic rescue device, and the boosting module is used for boosting, so that the defects of the prior art are eliminated, the direct-current high voltage existing in the prior device for a long time is eliminated, and the potential safety hazard possibly caused in the production and maintenance process due to the direct-current high voltage is eliminated.
In order to solve the problems, the invention provides a method for realizing power supply of a high-power elevator automatic rescue device, which comprises the following steps of: whether external power accessed by the elevator is normal is detected based on a power grid detection module in the elevator, when the external power is detected to be abnormal, a contactor on the external power grid is disconnected, a standby power supply in an automatic rescue device is adopted to supply power to the high-power elevator, the rated power of the high-power elevator is above 40kW, the standby power supply in the automatic rescue device adopts a low-voltage battery pack, and the voltage of the low-voltage battery pack is within 100V; in the process of supplying power by adopting a standby power supply in an emergency device, controlling the standby power supply to complete boosting treatment through a three-phase six-bridge-arm staggered parallel DCDC boosting module; and outputting the current and the voltage after the boosting treatment to an inverter module to finish the power supply of the high-power elevator.
When a standby power supply in an automatic rescue device is adopted to supply power to a high-power elevator, a voltage outer ring, a current inner ring and a constant-voltage current-limiting mode are adopted to control boosting treatment.
The voltage outer ring, the current inner ring and the constant voltage current limiting mode control output process comprise:
sampling an output voltage value and an output current value;
generating an output current reference value by comparing the output voltage value with a reference voltage and through a first PI regulator;
judging whether the current reference value is greater than a current upper limit value, if so, taking the current upper limit value as a comparison output result, and if not, taking the current reference value as a comparison output result;
comparing the comparison output result with the sampled output current value and generating a PWM reference value through a second PI regulator;
and according to the PWM reference value, decoupling into a control signal in the three-phase six-bridge-arm interleaved parallel DCDC boosting module.
The outputting the boosted current and voltage to the inverter module further comprises:
and driving the brake resistor to discharge based on the PWM reference value.
The three-phase six-bridge-arm staggered parallel DCDC boosting module is formed by combining a boosting module power tube, a transformer and a rectifying module.
The method further comprises the following steps:
sampling an input voltage value and an input current value;
completing input power calculation based on the sampled input voltage value and input current value;
finishing battery pack discharge management and battery pack total electric quantity estimation based on the sampled input voltage value and input current value;
sampling an output voltage value and an output current value;
finishing output power calculation based on the sampled output voltage value and output current value;
efficiency calculations are done based on the input power and the output power.
Correspondingly, the invention also provides an automatic elevator rescue device, which comprises:
the external power detection module is used for detecting whether external power accessed by the high-power elevator is normal or not based on the power grid detection module in the elevator, and the rated power of the high-power elevator is more than 40 kW;
automatic rescue control module for when detecting external power abnormal, after the contactor on the external grid of disconnection, adopt stand-by power supply to supply power to high-power type elevator, wherein:
the standby power supply adopts a low-voltage battery pack, and the voltage of the low-voltage battery pack is within 100V; the automatic rescue control module controls the standby power supply to complete boosting processing through the three-phase six-bridge-arm staggered parallel DCDC boosting module in the process of supplying power to the elevator; and outputting the boosted current and voltage to an inverter module.
And in the power supply process, the automatic rescue control module adopts a voltage outer ring, a current inner ring and a constant voltage current limiting mode to control boosting treatment.
The automatic rescue control module includes:
the voltage output sampling module is used for sampling an output voltage value;
the current output sampling module is used for sampling an output current value;
the voltage loop module is used for comparing the output voltage value with a reference voltage and generating an output current reference value through a first PI regulator;
the current limiting module is used for judging whether the current reference value is greater than a current upper limit value or not, if the current reference value is greater than the upper limit value, the current upper limit value is taken as a comparison output result, and if the current reference value is not greater than the upper limit value, the current reference value is taken as a comparison output result;
the current loop module is used for comparing the comparison output result with the sampled output current value and generating a PWM reference value through a second PI regulator;
and the PWM module is used for decoupling the control signals into the three-phase six-bridge-arm interleaved parallel DCDC boosting module according to the PWM reference value.
The automatic rescue control module further comprises:
the voltage input sampling module is used for sampling an input voltage value;
the current input sampling module is used for sampling an input current value;
the input power module is used for completing input power calculation based on the sampled input voltage value and input current value;
the battery pack discharge management module is used for finishing battery pack discharge management and total battery pack electric quantity estimation based on the sampled input voltage value and input current value;
the output power module is used for finishing output power calculation based on the sampled output voltage value and output current value;
and the efficiency calculation module is used for finishing efficiency calculation based on the input power and the output power.
In the embodiment of the invention, the low-voltage battery pack can be matched with and replace the small-capacity high-voltage battery pack of the original high-power automatic elevator rescue device in the automatic elevator rescue device, so that the direct-current high voltage existing in the conventional device for a long time is eliminated, and potential safety hazards possibly caused in the production and maintenance process due to the direct-current high voltage are eliminated; the high-capacity low-voltage battery pack is used for replacing a low-capacity high-voltage battery, so that the performance of the battery is improved, the charging and discharging management of the battery is simplified, the service life of the battery is prolonged, and the cost of the battery is reduced. The boosting treatment is realized based on the low-voltage battery pack, so that higher output power, impulse current energy resistance and higher efficiency can be realized, and the boosting device is suitable for elevators with medium or large power.
In specific implementation, a three-phase six-bridge-arm staggered parallel DCDC boost topology is adopted, the power tube acts under the condition of a soft switch, the problem of heating of the power tube is solved, and the working efficiency is improved (the normal operation efficiency of a boost module can reach more than 0.94, and the overall efficiency can reach more than 0.9); 6 frequency multiplication output can be realized, and the size of a filter is reduced; the voltage outer ring, the current inner ring and the current-limiting constant-voltage control are adopted, so that the problem of large current existing in the moment of power-on of the elevator and starting of the frequency converter is solved, and the power tube is protected to avoid the damage phenomenon.
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 schematic structural view of a conventional medium or large power direct power supply type elevator automatic rescue device in the prior art;
fig. 2 is a schematic structural view of a medium-or large-sized power direct-supply type elevator automatic rescue device in an embodiment of the invention;
FIG. 3 is a schematic diagram of a three-phase six-leg interleaved parallel DCDC boost topology in an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a power supply of the automatic rescue device for a high-power elevator in the embodiment of the invention;
FIG. 5 is a flow chart of a method for supplying power to an automatic rescue device of a high-power elevator in the embodiment of the invention;
fig. 6 is a schematic structural diagram of an automatic elevator rescue device in the embodiment of the invention;
fig. 7 is a schematic structural diagram of an automatic rescue control module in an embodiment of the present invention;
fig. 8 is another schematic structural diagram of the automatic rescue control module in the embodiment 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.
The power grid detection module in the elevator detects whether an external power accessed by the elevator is normal, when the external power is abnormal, a contactor on the external power grid is disconnected, a standby power supply in an automatic rescue device is adopted to supply power to the high-power elevator, the rated power of the high-power elevator is above 40kW, the standby power supply in the automatic rescue device adopts a low-voltage battery pack, and the voltage of the low-voltage battery pack is within 100V; in the process of supplying power by adopting a standby power supply in the automatic rescue device, controlling the standby power supply to complete boosting processing through a three-phase six-bridge-arm staggered parallel DCDC boosting module; and outputting the current and the voltage after the boosting treatment to an inverter module to finish the power supply of the high-power elevator.
Specifically, fig. 2 shows a schematic structural diagram of a medium-or large-power direct-power-supply type elevator automatic rescue device in an embodiment of the invention, and the device is composed of a low-voltage battery pack, a battery pack charging and charging management module, a direct-current boosting module, an inversion module, a main control module and a human-computer interface, aiming at the principle structure in fig. 1, wherein the battery pack powered by a standby power supply in the improved automatic rescue device is the low-voltage battery pack, and the output electric energy is output to the inversion module after being processed by the boosting module. The low-voltage battery pack and the special boosting module are adopted to replace a high-voltage battery pack and a pre-starting module of a direct power supply type power failure automatic rescue device of a common medium-sized or large-sized power elevator, so that the size is reduced, and the cost is reduced; by using the low-voltage battery pack, the service life and the reliability of the battery can be effectively improved, the charging and discharging control difficulty is reduced, and the safety in the process of installing and maintaining the replaced battery is also improved.
Specifically, fig. 3 shows a schematic diagram of a three-phase six-leg interleaved parallel DCDC boost topology in an embodiment of the present invention, which is composed of boost module power tubes (VS1, VS2, VS3, VS4, VS5, VS6, VS7, VS8, VS9, VS10, VS11, and VS12), transformers (T1, T2, and T3), rectifier modules, an inductor L1, a capacitor E2, a capacitor E3, and the like, where the power tubes are three sets of full-bridge shift circuits with a carrier phase difference of 120 °, the transformer secondary sides are connected with a three-phase full-bridge rectifier after being connected in star, each full-bridge shift super front arm (VS 3, VS5VS7, VS11) ZVS (zero-voltage switching) operates, and each full-bridge shift rear arm (VS2VS4, VS6 8, VS10VS12) operates as a ZCS (zero-current switching); by multiplying the frequency of the output by 6, the size of the filter device is reduced (L1E 2E 3). Based on the structure, a stable and reliable direct-current voltage with the isolated voltage of 600V can be provided for the inversion module when the automatic rescue device operates in the inversion mode, forward and reverse currents can be supported, power required by medium-sized or large-sized power automatic rescue operation can be provided, and short-time current spikes generated in the process of powering on and starting an elevator can be coped with.
Fig. 4 shows a circuit schematic diagram of a high-power elevator automatic rescue device in an embodiment of the invention for realizing power supply, and the circuit schematic diagram comprises a three-phase six-bridge-arm interleaved parallel connection DCDC boosting module, a discharge resistance control module, an input/output voltage/current sampling module, an auxiliary power supply and the like. The power tube works under the condition of soft switching, and can output larger power for a long time; the automatic rescue device for the medium and small power elevator has the advantages that the voltage outer ring, the current inner ring and the current-limiting constant voltage control are adopted, the short-time current spike resistance and the overload resistance are very strong, and the defects that the output power of the ordinary automatic rescue device for the medium and small power elevator is insufficient, the current impulse resistance is insufficient, and the large power elevator cannot be dragged are overcome. The power tube protection or damage phenomenon caused by large current existing at the moment of electrification of an elevator and starting of a frequency converter is solved, and an output current reference value is generated by acquiring an output voltage signal, comparing the output voltage signal with a reference voltage and passing through a PI (proportional-integral) regulator in a voltage loop; when the reference value is larger than the upper limit value, the current is limited to the upper limit value, and overcurrent damage or protection phenomena caused by external impulse are prevented; comparing the generated output current reference value with an output current sampling value and generating a PWM reference value through a PI regulator in a current loop; and according to the generated PWM reference value, the control signals from VS1 to V13 are decoupled, and the product of the whole output current and the output voltage is the output power. Battery voltage sampling and battery current sampling are used primarily to perform battery discharge management functions and to calculate input power. The main control module is powered on when the external power is normal or the test is started, the external power is started to run, if the external power is normal, the main control module enters a charging management program to manage the charging of the battery, and displays the relevant state; when the external electricity is abnormal for more than 3s or the test is started, the main control module enters an automatic rescue operation state, the inverter module and the boosting module are started by using the contact signals, and the main control module receives the operation states of the starting module and the boosting module through RS485 signals and displays the operation states in the display module.
In the specific implementation process, a high-speed DSP is arranged in the whole automatic elevator rescue device, more than 6 groups of independent PWM output channels are arranged in the automatic elevator rescue device, 3 groups of 12 power tubes which are in staggered phase 120-degree phase-shift full-bridge topology work are respectively controlled, more than 5 groups of analog-to-digital conversion channels are respectively used for sampling battery voltage, battery current, output voltage, output current and radiator temperature.
In a specific implementation process, fig. 5 shows a flowchart of a method for supplying power to an automatic rescue device of a high-power elevator in an embodiment of the present invention, which specifically includes the following steps:
s501, detecting whether an external power accessed by the elevator is normal or not based on a power grid detection module in the elevator, if the external power is normal, supplying power by the external power, and continuing to intervene in a detection link, and if the external power is abnormal, entering S502;
s502, when the external power is abnormal, the contactor on the external power grid is disconnected, the standby power supply in the automatic rescue device is adopted to supply power to the elevator,
in the specific implementation process, a standby power supply in the automatic rescue device adopts a low-voltage battery pack; in the process of supplying power by adopting a standby power supply in the automatic rescue device, controlling the standby power supply to complete boosting processing through a three-phase six-bridge-arm staggered parallel DCDC boosting module; and outputting the boosted current and voltage to an inverter module.
S503, starting a voltage outer ring and a current inner ring, and controlling boosting treatment in a constant voltage current limiting mode.
S504, sampling an output voltage value and an output current value;
s505, comparing the output voltage value with a reference voltage, and generating an output current reference value through a PI regulator in a voltage ring;
s506, judging whether the current reference value is larger than a current upper limit value;
in a specific implementation process, if the current reference value is greater than the upper limit value, taking the current upper limit value as a comparison output result, and if the current reference value is not greater than the upper limit value, taking the current reference value as the comparison output result;
s507, comparing the comparison output result with the sampled output current value and generating a PWM reference value through a PI regulator in a current loop;
s508, decoupling into control signals in the three-phase six-bridge-arm interleaved parallel DCDC boosting module according to the PWM reference value;
s509, controlling the standby power supply to complete voltage boosting processing through the three-phase six-bridge-arm staggered parallel DCDC voltage boosting module; and outputting the current and the voltage after the boosting treatment to an inverter module to finish the power supply of the high-power elevator.
In a specific implementation process, the brake resistor can be driven to discharge based on the PWM reference value. When the elevator runs in the light load direction, if the elevator has an energy feedback function, when the energy is large enough, the voltage of the automatic rescue device is increased, the inverter module ensures that the output voltage is unchanged, the energy is transferred to the direct current bus, and finally the voltage of the direct current bus is increased. At this time, the brake resistor is required to release the part of electric quantity, and the decoupled PWM signal is converted into a control signal of the IGBT to control the brake resistor to discharge.
In a specific implementation process, the three-phase six-bridge-arm staggered parallel DCDC boosting module is formed by combining a boosting module power tube, a transformer and a rectifying module.
In the specific implementation process, the method also relates to sampling an input voltage value and an input current value; completing input power calculation based on the sampled input voltage value and input current value; finishing battery pack discharge management and battery pack total electric quantity estimation based on the sampled input voltage value and input current value; sampling an output voltage value and an output current value; finishing output power calculation based on the sampled output voltage value and output current value; efficiency calculations are done based on the input power and the output power.
Correspondingly, fig. 6 also shows a schematic structural diagram of an automatic elevator rescue device in an embodiment of the invention, and the automatic elevator rescue device comprises:
the external power detection module is used for detecting whether external power accessed by the high-power elevator is normal or not based on the power grid detection module in the elevator, and the rated power of the high-power elevator is more than 40 kW;
automatic rescue control module for when detecting external power abnormal, after the contactor on the external grid of disconnection, adopt stand-by power supply to supply power to high-power type elevator, wherein:
the standby power supply adopts a low-voltage battery pack, and the voltage of the low-voltage battery pack is within 100V, such as 100V, 98V, 24V and other low-voltage battery packs; the automatic rescue control module controls the standby power supply to complete boosting processing through the three-phase six-bridge-arm staggered parallel DCDC boosting module in the process of supplying power to the elevator; and outputting the boosted current and voltage to an inverter module.
In the specific implementation process, the automatic rescue control module adopts a voltage outer ring, a current inner ring and a constant voltage current limiting mode to control boosting treatment in the power supply process.
In a specific implementation process, fig. 7 further shows a schematic structural diagram of an automatic rescue control module in an embodiment of the present invention, where the automatic rescue control module includes:
the voltage output sampling module is used for sampling an output voltage value;
the current output sampling module is used for sampling an output current value;
the voltage loop module is used for comparing the output voltage value with a reference voltage and generating an output current reference value through a first PI regulator;
the current limiting module is used for judging whether the current reference value is greater than a current upper limit value or not, if the current reference value is greater than the upper limit value, the current upper limit value is taken as a comparison output result, and if the current reference value is not greater than the upper limit value, the current reference value is taken as a comparison output result;
the current loop module is used for comparing the comparison output result with the sampled output current value and generating a PWM reference value through a second PI regulator;
and the PWM module is used for decoupling the control signals into the three-phase six-bridge-arm interleaved parallel DCDC boosting module according to the PWM reference value.
In a specific implementation process, in the specific implementation process, fig. 8 further shows another schematic structural diagram of the automatic rescue control module in the embodiment of the present invention, and based on the structure shown in fig. 7, the automatic rescue control module further includes:
the voltage input sampling module is used for sampling an input voltage value;
and the current input sampling module is used for sampling an input current value.
The input power module is used for completing input power calculation based on the sampled input voltage value and input current value;
the battery pack discharge management module is used for finishing battery pack discharge management and total battery pack electric quantity estimation based on the sampled input voltage value and input current value;
the output power module is used for finishing output power calculation based on the sampled output voltage value and output current value;
and the efficiency calculation module is used for finishing efficiency calculation based on the input power and the output power.
In the embodiment of the invention, the display module has the capability of automatically detecting the operating parameters of all the modules and displays the operating parameters in the display module through the RS485 bus in the system, and data can be uploaded through the WIFI function in the display module if necessary.
The conventional two-stage type automatic elevator rescue device on the market at present has the rated power of 1-4 kW generally, the working efficiency of the device is lower than 85 percent generally, and the device is suitable for medium and low speed passenger elevators on the market (the rated power is less than 40kW, the load is 1.6-2 tons, and the running speed is 1.75-2.5 m/s); the high-power high-speed object is used (the rated power is more than 50kW, the load is 1.6-2 tons, and the running speed is more than 6m/s), the normal running power is usually more than 6kW, the normal running power can reach more than 10kW in a short time under the condition of acceleration or deceleration, and the conventional automatic elevator rescue device cannot be used usually. The invention adopts a soft switch mode to work, the rated power can reach more than 6kW, the invention has strong shock peak resistance, the maximum output power can reach more than 10kW, and the invention can support the automatic rescue operation of a high-power high-speed elevator.
In a specific application process, a battery pack with 40-48 batteries connected in series can be replaced by a battery pack with 8 high-capacity batteries connected in parallel and a boosting module, and the battery pack has the same output capacity and overload capacity as the automatic rescue device on the market at present and has stronger shock spike resistance; the number of batteries is reduced, and the service life of the batteries is optimized; the dependence of overload capacity on the battery pack is reduced, and in practical tests, the 24AH battery can meet basic output and short-time overload output (the electricity content of the battery pack with 48 series-connected 7AH batteries is equivalent to that of the battery pack with 8 42AH batteries), so that the capacity of the battery pack can be adjusted according to practical requirements, and the cost is reduced; the direct current bus voltage is stabilized, and the direct current bus voltage is stabilized at 540-600V after modification.
In the embodiment of the invention, the low-voltage battery pack can be matched with and replace the small-capacity high-voltage battery pack of the original high-power automatic elevator rescue device in the automatic elevator rescue device, so that the direct-current high voltage existing in the conventional device for a long time is eliminated, and potential safety hazards possibly caused in the production and maintenance process due to the direct-current high voltage are eliminated; the low-voltage battery pack is used for replacing a high-voltage battery, so that the performance of the battery is improved, the charging and discharging management of the battery is simplified, the service life of the battery is prolonged, and the cost of the battery is reduced. The boosting treatment is realized based on the low-voltage battery pack, so that higher output power, impulse current energy resistance and higher efficiency can be realized, and the boosting device is suitable for elevators with medium or large power. In specific implementation, a three-phase six-bridge-arm staggered parallel DCDC boost topology is adopted, and a power tube acts under the condition of a soft switch, so that the problem of heating of the power tube is solved; 6 frequency multiplication output can be realized, and the size of a filter is reduced; the voltage outer ring, the current inner ring and the current-limiting constant-voltage control are adopted, so that the problem of large current existing in the moment of power-on of the elevator and starting of the frequency converter is solved, and the power tube is protected to avoid the damage phenomenon.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic or optical disk, or the like.
In addition, the method and the device for realizing power supply of the automatic high-power elevator rescue device provided by the embodiment of the invention are described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A method for realizing power supply of a high-power automatic elevator rescue device is characterized in that when commercial power is supplied normally, a main control template controls and connects an external power grid and a contactor of an elevator room to realize circuit connection, when the commercial power cannot be supplied normally, a main control module controls and connects the external power grid and the contactor of the elevator room to disconnect, and the contactor for connecting a standby power supply and the contactor of the elevator to realize circuit connection comprises the following steps:
whether outer electricity that detects the elevator and insert is normal based on electric wire netting detection module in the elevator, when detecting that outer electricity is unusual, the contactor on the outer electric wire netting of disconnection, the reserve power supply supplies power to high-power type elevator in adopting automatic rescue device, high-power type elevator rated power is more than 40kW, its characterized in that:
a standby power supply in the automatic elevator rescue device adopts a low-voltage battery pack, and the voltage of the low-voltage battery pack is within 100V; in the process of supplying power by adopting a standby power supply in the automatic rescue device, controlling the standby power supply to complete boosting processing through a three-phase six-bridge-arm staggered parallel DCDC boosting module; outputting the current and the voltage after the boosting treatment to an inversion module to finish the power supply of the high-power elevator automatic rescue device;
the three-phase six-bridge-arm interleaved parallel DCDC boost module is formed by combining a boost module power tube, a transformer and a rectifier module, wherein the boost module power tube comprises three groups of phase-shifted full-bridge circuits with carrier phase difference of 120 degrees, secondary sides of the transformer are connected with the three-phase full-bridge rectifier after being connected in a star shape, each phase-shifted full-bridge super-front arm zero-voltage switch acts, and each phase-shifted full-bridge lagging arm zero-current switch acts;
a high-speed DSP is arranged in the automatic elevator rescue device, more than 6 groups of independent PWM output channels are arranged in the automatic elevator rescue device, and 3 groups of 12 power tubes which are in phase-staggered 120-degree phase-shifted full-bridge topology work are respectively controlled.
2. The method for supplying power to the automatic high-power elevator rescue device as defined in claim 1, wherein in the process of supplying power to the elevator by using the standby power supply in the automatic rescue device, the voltage boosting treatment is controlled by using a voltage outer ring, a current inner ring and a constant voltage current limiting mode.
3. The method for supplying power for the automatic rescue device of the high-power elevator as claimed in claim 2, wherein the output control process of the voltage outer ring, the current inner ring and the constant voltage current limiting mode comprises:
sampling an output voltage value and an output current value;
generating an output current reference value by comparing the output voltage value with a reference voltage and through a first PI regulator;
judging whether the current reference value is greater than a current upper limit value, if so, taking the current upper limit value as a comparison output result, and if not, taking the current reference value as a comparison output result;
comparing the comparison output result with the sampled output current value and generating a PWM reference value through a second PI regulator;
and according to the PWM reference value, decoupling into a control signal in the three-phase six-bridge-arm interleaved parallel DCDC boosting module.
4. The method for supplying power to the automatic high-power elevator rescue device according to claim 3, wherein the step of outputting the boosted current and voltage to the inverter module further comprises:
and driving the brake resistor to discharge based on the PWM reference value.
5. The method for supplying power to the high-power automatic elevator rescue device according to any one of claims 1 to 4, characterized by further comprising the following steps:
sampling an input voltage value and an input current value;
completing input power calculation based on the sampled input voltage value and input current value;
finishing battery pack discharge management and battery pack total electric quantity estimation based on the sampled input voltage value and input current value;
sampling an output voltage value and an output current value;
finishing output power calculation based on the sampled output voltage value and output current value;
efficiency calculations are done based on the input power and the output power.
6. The utility model provides an automatic rescue device of elevator, its characterized in that, automatic rescue device of elevator when the commercial power is normally supplied power, the circuit switch-on is realized to the contactor between outer electric wire netting of master control template control connection and elevator, and when the commercial power can not normally be supplied power, the contactor disconnection between outer electric wire netting of master control module control connection and elevator, the switch-on is connected the contactor of stand-by power supply and elevator and is realized the circuit switch-on, include:
the external power detection module is used for detecting whether external power accessed by the high-power elevator is normal or not based on the power grid detection module in the elevator, and the rated power of the high-power elevator is more than 40 kW;
automatic rescue control module for when detecting external power abnormal, after the contactor on the external grid of disconnection, adopt stand-by power supply to supply power to high-power type elevator, wherein:
the standby power supply adopts a low-voltage battery pack, and the voltage of the low-voltage battery pack is within 100V; the automatic rescue control module controls the standby power supply to complete boosting processing through the three-phase six-bridge-arm staggered parallel DCDC boosting module in the process of supplying power to the elevator; outputting the boosted current and voltage to an inversion module;
the three-phase six-bridge-arm interleaved parallel DCDC boost module is formed by combining a boost module power tube, a transformer and a rectifier module, wherein the boost module power tube comprises three groups of phase-shifted full-bridge circuits with carrier phase difference of 120 degrees, secondary sides of the transformer are connected with the three-phase full-bridge rectifier after being connected in a star shape, each phase-shifted full-bridge super-front arm zero-voltage switch acts, and each phase-shifted full-bridge lagging arm zero-current switch acts;
a high-speed DSP is arranged in the automatic elevator rescue device, more than 6 groups of independent PWM output channels are arranged in the automatic elevator rescue device, and 3 groups of 12 power tubes which are in phase-staggered 120-degree phase-shifted full-bridge topology work are respectively controlled.
7. An automatic elevator rescue apparatus as claimed in claim 6, wherein the automatic rescue control module controls the boosting process by a voltage outer loop, a current inner loop and a constant voltage current limiting mode in the power supply process.
8. The elevator automatic rescue apparatus of claim 7, wherein the automatic rescue control module comprises:
the voltage output sampling module is used for sampling an output voltage value;
the current output sampling module is used for sampling an output current value;
the voltage loop module is used for comparing the output voltage value with a reference voltage and generating an output current reference value through a first PI regulator;
the current limiting module is used for judging whether the current reference value is greater than a current upper limit value or not, if the current reference value is greater than the upper limit value, the current upper limit value is taken as a comparison output result, and if the current reference value is not greater than the upper limit value, the current reference value is taken as a comparison output result;
the current loop module is used for comparing the comparison output result with the sampled output current value and generating a PWM reference value through a second PI regulator;
and the PWM module is used for decoupling the control signals into the three-phase six-bridge-arm interleaved parallel DCDC boosting module according to the PWM reference value.
9. The elevator automatic rescue apparatus of claim 8, wherein the automatic rescue control module further comprises:
the voltage input sampling module is used for sampling an input voltage value;
the current input sampling module is used for sampling an input current value;
the input power module is used for completing input power calculation based on the sampled input voltage value and input current value;
the battery pack discharge management module is used for finishing battery pack discharge management and total battery pack electric quantity estimation based on the sampled input voltage value and input current value;
the output power module is used for finishing output power calculation based on the sampled output voltage value and output current value;
and the efficiency calculation module is used for finishing efficiency calculation based on the input power and the output power.
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| US11053096B2 (en) * | 2017-08-28 | 2021-07-06 | Otis Elevator Company | Automatic rescue and charging system for elevator drive |
| CN108957154B (en) * | 2018-06-05 | 2021-01-19 | 广东寰宇电子科技股份有限公司 | Power grid phase sequence identification method and device |
| CN109245278A (en) * | 2018-09-25 | 2019-01-18 | 恒天九五重工有限公司 | A kind of AC-DC double power supply intersection electric-control system for stake machine |
| CN110957800B (en) * | 2019-11-30 | 2021-07-13 | 杭州优迈科技有限公司 | Power supply control method of elevator power supply system and elevator power supply system |
| CN112249827B (en) * | 2020-10-27 | 2023-08-29 | 杭州优迈科技有限公司 | Elevator emergency rescue control circuit and control method |
| CN112660967A (en) * | 2020-12-15 | 2021-04-16 | 江苏冠群新能源技术有限公司 | Elevator and method for recycling self-generated electric energy |
| CN112290776B (en) | 2020-12-31 | 2021-06-08 | 江苏时代新能源科技有限公司 | Control method and device of voltage converter and voltage control system |
| CN112850407B (en) * | 2021-01-25 | 2023-01-06 | 广东寰宇电子科技股份有限公司 | Method and system for controlling elevator car to move under emergency condition of elevator |
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