CN115694244A - Elevator and power supply control system and method thereof - Google Patents
Elevator and power supply control system and method thereof Download PDFInfo
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- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
Abstract
The invention relates to the technical field of power conversion, and discloses a lifter and a power supply control system and method thereof. The system comprises: the alternating current feedback module comprises a power supply connecting terminal and a rectification and inversion module connected with the power supply connecting terminal, and the rectification and inversion module comprises two active front end rectification units (AFEs); and the frequency converter is connected with the alternating current feedback module through a direct current bus and is connected with a driving motor of the elevator. Through the power supply control system, the electric energy generated by the reversal of the driving motor when the elevator descends can be collected and utilized through the power supply control system, and the effect of high efficiency and energy saving is achieved.
Description
Technical Field
The invention relates to the technical field of power conversion, in particular to a lifter and a power supply control system and method thereof.
Background
The construction elevator is a main tool for bearing transportation personnel and goods on a construction site, and potential energy is converted into heat energy through a resistance box or a brake resistor and is consumed up during the descending process of the elevator, so that energy waste is caused. Most of the existing construction elevators are provided with frequency conversion devices with rectification and inversion functions to realize frequency change of an input power frequency power supply, but energy cannot be fed back to a power grid.
Therefore, a set of efficient and clean novel elevator power control or processing system is needed for realizing energy recovery and feedback of the construction elevator.
Disclosure of Invention
The invention aims to overcome the problem that energy generated in the descending process of the conventional elevator cannot be recycled, and provides a power supply control system, a power supply control method and the elevator.
In order to achieve the above object, a first aspect of the present invention provides a power supply control system for an elevator, the system comprising:
the alternating current feedback module comprises a power supply connecting terminal and a rectification and inversion module connected with the power supply connecting terminal, and the power supply connecting terminal is used for being connected with a power grid;
the frequency converter is connected with the alternating current feedback module through a direct current bus and connected with a driving motor of the elevator, and is used for outputting alternating current to the driving motor, rectifying alternating current generated by the driving motor in the descending process of the elevator into direct current and outputting the direct current to the alternating current receiving and feedback module;
the direct current bus is provided with a voltage detection device for detecting the bus voltage of the direct current bus;
the rectification and inversion module comprises two active front-end rectification units, the active front-end rectification units are connected with the frequency converter through a direct-current bus, each active front-end rectification unit comprises a controller and a high-speed digital signal processing chip, the controller is in communication connection with the voltage detection device and is used for controlling the working mode of the active front-end rectification unit to be a rectification mode or an inversion mode according to the bus voltage, the high-speed digital signal processing chip is used for controlling the active front-end rectification unit to rectify alternating current input by the power grid into direct current to be output to the frequency converter in the rectification mode and inversely convert the direct current output by the frequency converter into alternating current with the same phase as the alternating current of the power grid and feed the alternating current back to the power grid through the power supply connecting terminal in the inversion mode.
In one embodiment of the application, the active front-end rectifying unit comprises a rectifying and inverter and a direct-current energy storage capacitor, the rectifying and inverter is connected with a power connection terminal, the rectifying and inverter is further connected with a frequency converter through a direct-current bus, the direct-current energy storage capacitor is connected with the rectifying and inverter in parallel, the rectifying and inverter comprises a plurality of insulated gate bipolar transistors controlled to be switched on and switched off by a high-speed digital signal processing chip, and each insulated gate bipolar transistor is connected with a diode in anti-parallel.
In an embodiment of the present application, the active front-end rectifying unit further includes an LC filter circuit and a PFC inductor, and the LC filter circuit PFC inductor is sequentially connected between the power connection terminal and the rectifying and inverter.
In one embodiment of the present application, the ac power feedback module further includes an electromagnetic interference filter connected between the rectifying and inverting module and the power connection terminal.
In one embodiment of the present application, the ac power feedback module further comprises a four-quadrant ammeter connected between the power connection terminal and the emi filter.
In one embodiment of the present application, the ac power feedback module further comprises an ac limit switch connected between the four-quadrant electric meter and the electromagnetic interference filter.
In one embodiment of the present application, the two active front-end rectifying units are communicatively connected to each other, so that the phases of the output power, the output voltage and the output current of the two active front-end rectifying units are consistent.
In one embodiment of the present application, the system further comprises a dc fuse connected between the ac receiving and feedback module and the frequency converter.
In one embodiment of the present application, the ac feedback module is integrated into a plastic insulator housing.
In one embodiment of the present application, the ac power feedback module further comprises:
and the molded case circuit breaker is connected between the power supply connecting terminal and the rectification and inversion module.
In a second aspect, the present application provides an elevator including the power control system described above.
The third aspect of the present application provides a power supply control method, which is applied to the power supply control system, and the method includes:
acquiring bus voltage through a controller;
under the condition that the bus voltage does not reach a first voltage threshold value, the working mode of the active front-end rectifying unit is controlled to be a rectifying mode through the controller, and the active front-end rectifying unit is controlled to rectify alternating current input by a power grid through a power supply connecting terminal into direct current through the high-speed digital signal processing chip and output the direct current to the frequency converter;
under the condition that the bus voltage reaches a first voltage threshold value, the working mode of the active front-end rectifying unit is controlled to be an inversion mode through the controller, the active front-end rectifying unit is controlled through the high-speed digital signal processing chip to invert direct current output to the rectifying and inversion module by the frequency converter into alternating current which is synchronous with alternating current of the power grid and has the same phase with the alternating current of the power grid, and the alternating current is fed back to the power grid through the power supply connecting terminal.
Through the technical scheme, the electric energy generated by the reverse rotation of the driving motor when the elevator descends can be collected and utilized through the power supply control system, and the efficient and energy-saving effect is achieved. Meanwhile, the LC filter circuit and the PFC inductor included in the power control system can greatly reduce harmonic waves generated during frequency conversion; the power control system adopts the high-speed digital signal processing chip to control the rectification and inversion of the current, so that the control process is more accurate, the power factor is high, the redundant energy can be returned to the power grid to the maximum extent, and the effects of energy conservation and consumption reduction are obvious.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 schematically illustrates a circuit topology of a power control system according to an embodiment of the present application;
fig. 2 schematically illustrates a circuit topology of an active front-end rectification unit according to an embodiment of the present application;
fig. 3 schematically shows a flow chart of a power control method according to an embodiment of the application.
Detailed Description
The following detailed description of embodiments of the present application will be made with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present application, are given by way of illustration and explanation only, and are not intended to limit the present application.
It should be noted that if directional indications (such as up, down, left, right, front, back, 8230; \8230;) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
Fig. 1 schematically illustrates a circuit topology of a power control system according to an embodiment of the present application, and as shown in fig. 1, in an embodiment of the present application, there is provided a power control system for an elevator, which may include:
the alternating current feedback module 100 comprises a power connection terminal 110 and a rectification and inversion module 120 connected with the power connection terminal 110, wherein the power connection terminal 110 is used for being connected with a power grid;
and the frequency converter 200 is connected with the alternating current feedback module 100 through a direct current bus and connected with a driving motor 400 of the elevator, and the frequency converter 200 is used for outputting alternating current to the driving motor 400 and rectifying alternating current generated by the driving motor 400 in the descending process of the elevator into direct current and outputting the direct current to the alternating current receiving and feedback module.
The direct current bus comprises a voltage detection device for detecting the bus voltage of the direct current bus;
the rectification and inversion module 120 includes two active front end rectification units (111, 112), each active front end rectification unit (111, 112) includes a controller and a high-speed digital signal processing chip, the controller is connected to the voltage detection device in a communication manner, and is configured to control a working mode of the active front end rectification unit (111, 112) to be a rectification mode or an inversion mode according to the bus voltage, the high-speed digital signal processing chip is configured to control the active front end rectification unit (111, 112) to rectify an ac current input by the power grid into a dc current and output the dc current to the frequency converter 200 in the rectification mode, and invert the dc current output by the frequency converter 200 into an ac current having a phase synchronous with the ac current of the power grid and feed back the ac current to the power grid through the power connection terminal 110 in the inversion mode.
The frequency converter is an electric energy control device which converts a power frequency power supply provided by a power grid into another frequency by utilizing the on-off action of a power semiconductor device, and converts the power frequency power supply (50 Hz or 60 Hz) provided by the power grid into alternating voltage with various frequencies so as to realize the variable-speed operation of the motor. The frequency converter mainly comprises a rectifying unit (converting alternating current into direct current), an inverting unit (converting direct current into alternating current), a braking unit, a driving unit, a detecting unit and other micro-processing units. The rectifying unit is used for rectifying three-phase alternating current into direct current, and the inverting unit is used for inverting the direct current into alternating current with variable voltage and frequency. The rectifying unit and the inverting unit of the existing frequency converter mainly comprise nonlinear power electronic elements, so a large amount of harmonic waves are generated on the input side and the output side, harmonic interference is caused, and the power factor during frequency conversion is reduced.
The frequency converter 200 is connected with a driving motor 400 of the elevator, the driving motor 400 is used for driving the elevator to ascend, when the elevator descends, the driving motor 400 reversely rotates, and the conversion from potential energy to electric energy is completed, if no energy recovery device is arranged, the electric energy generated by the reverse rotation of the driving motor 400 can only be converted into heat energy by a brake resistor R4 and consumed. The present embodiment uses an ac feedback module 100 connected to the inverter 200 via a dc bus to accomplish energy recovery. After the alternating current generated by the reverse rotation of the driving motor 400 is rectified into direct current by the rectifying unit of the frequency converter 200, the direct current is output to the alternating current feedback module 100 through the direct current bus, the alternating current feedback module 100 inverts the direct current into alternating current with the same phase as the alternating current of the power grid through the rectifying and inverting module 120, and the alternating current is fed back to the power grid through the power connection terminal 110 so as to be used by other equipment, and the process of energy recovery is completed through inversion.
The ac feedback module 100 also receives an ac current provided by the power grid through the power connection terminal 110, rectifies the ac current into a dc current through the rectification and inversion module 120, and outputs the dc current to the frequency converter 200 through the dc bus, so that the inverter unit of the frequency converter 200 performs the inversion frequency conversion, that is, the dc current required in the frequency conversion process of the frequency converter 200 is provided by the rectification and inversion module 120.
The rectifying and inverting module 120 includes two Active Front End rectifying units (111, 112) (Active Front End, AFE), and the rectifying and ac tasks of the rectifying and inverting module 120 are completed by the two Active Front End rectifying units (111, 112). When the elevator descends and the driving motor 400 reversely rotates, the voltage of the direct current bus can gradually rise, so that the time for inverting by the active front end rectifying units (111, 112) can be determined by the voltage of the direct current bus, each active front end rectifying unit (111, 112) comprises a controller and a high-speed digital signal processing chip, the controller controls the working mode of the active front end rectifying units (111, 112) to be a rectifying mode or an inverting mode through the bus voltage of the direct current bus acquired from a voltage detection device arranged on the direct current bus, when the bus voltage reaches a first voltage threshold value (the elevator is in a descending process), the controller controls the working mode of the active front end rectifying units (111, 112) to be the inverting mode, and the high-speed digital signal processing chip controls the active front end rectifying units (111, 112) to invert the direct current output by the frequency converter 200 into an alternating current synchronous with the alternating current of the power grid and feeds the alternating current back to the power grid through the power connection terminal 110; when the bus voltage does not reach the first voltage threshold (the elevator is in the rising process), the high-speed digital signal processing chip is used for controlling the active front-end rectifying units (111, 112) to rectify the alternating current input by the power grid into direct current and output the direct current to the frequency converter 200 in a rectifying mode. The specific value of the first voltage threshold may be determined according to the bus voltage measured when the elevator ascends and descends in the test run experiment, which is not limited in the present application.
In one embodiment of the present application, the two active front-end rectifying units (111, 112) are communicatively connected to each other, so that the phases of the output power, the output voltage and the output current of the two active front-end rectifying units (111, 112) are kept consistent.
The two active front-end rectifying units (111, 112) perform rectification together in a rectifying mode, rectify an alternating current input by a power grid into a direct current and output the direct current to the frequency converter 200, and perform inversion together in an inverting mode, so that the direct current output by the frequency converter 200 is inverted into an alternating current which is synchronous with the alternating current of the power grid and has the same phase. The two active front-end rectifying units (111, 112) need to be communicatively connected in order to keep the phases of the output power, the output voltage and the output current of the two active front-end rectifying units (111, 112) consistent. Optionally, the two active front-end rectification units (111, 112) are communicatively connected by using 485 protocol, and the specific manner of communicative connection may be determined by the design requirement of the elevator, which is not limited in this application.
The active front-end rectifying unit is a chopper-controlled reversible converter developed along with the practicability of a full-control type switching device, can perform rectifying work and inversion work, and operates in 4 quadrants on the power supply side. Because the self-turn-off device is adopted, the size and the phase of alternating current can be controlled through a proper PWM (Pulse width modulation, namely, a digital signal of a microprocessor is used for controlling an analog circuit), and the alternating current input current is close to sine wave through each filtering and energy storage link at the front end. And the power factor is adjustable in positive and negative with 1 as a midpoint. When the braking energy at the motor side is returned through the inverter to increase the voltage of the direct-current bus, the phase of alternating-current input current is opposite to the phase of power supply voltage, the regenerative power generation operation is realized, and the regenerative power is fed back to an alternating-current power grid.
Fig. 2 schematically shows a circuit topology of an active front-end rectifying unit (111, 112) according to an embodiment of the present application, please refer to fig. 1 and fig. 2 together, in an embodiment of the present application, the active front-end rectifying unit (111, 112) includes a rectifying and inverter 002 and a dc storage capacitor C1, the rectifying and inverter 002 is connected to the power connection terminal 110, the rectifying and inverter 002 is further connected to the frequency converter 200 through a dc bus, the dc storage capacitor C1 is connected in parallel to the rectifying and inverter 002, the rectifying and inverter 002 includes a plurality of insulated gate bipolar transistors (Q1-Q6), and each of the insulated gate bipolar transistors (Q1-Q6) is connected in anti-parallel to a diode (D1-D6).
An Insulated Gate Bipolar Transistor (IGBT) is a composite fully-controlled voltage-driven power Semiconductor device composed of Bipolar Junction Transistors (BJTs) and insulated gate Field Effect transistors (MOS), and has the advantages of both high input impedance of Metal-Oxide-Semiconductor Field Effect transistors (MOSFETs) and low on-state voltage drop of power transistors (Giant transistors, GTRs). The switching function of the insulated gate bipolar transistor is to enable the insulated gate bipolar transistor to be conducted by adding forward grid voltage to form a channel; and conversely, the reverse gate voltage is added to eliminate the channel, the base current is cut off, and the insulated gate bipolar transistor is turned off.
In an embodiment of the present application, the active front-end rectifying unit (111, 112) further includes an LC filter circuit 001 (an LC filter circuit) and PFC inductors (L1, L2, and L3) (PFC, power Factor Correction), where the LC filter circuit 001 and the PFC inductors (L1, L2, and L3) are sequentially connected between the Power connection terminal 110 and the rectifying and inverter 002.
Meanwhile, the direct-current energy storage capacitor C1 can be connected with a voltage-sharing resistor R1, and the voltage-sharing resistor R1 is used for consuming electric energy released by the direct-current energy storage capacitor C1; the active front-end rectifying units (111, 112) may be connected to the frequency converter 200 via snubber resistors (R2, R3) for increasing a voltage difference between the active front-end rectifying units (111, 112) and the frequency converter 200.
The direct current required in the frequency conversion process of the frequency converter 200 is provided by the rectification and inversion module 120 (i.e., provided by the active front-end rectification units (111, 112)), and the LC filter circuit 001 and the PFC inductors (L1, L2, L3) are added to the active front-end rectification units (111, 112), so that the harmonic generated in the frequency conversion process can be greatly reduced, and the power factor of the whole system is improved.
When the active front-end rectifying units (111, 112) perform uncontrolled rectifying work, the active front-end rectifying units are equivalent to a common rectifying bridge, the insulated gate bipolar transistors (Q1-Q6) do not work, after three-phase alternating current power supplies R, S and T are input, the three-phase alternating current power supplies enter a rectifying and inverter 002 through an LC filter circuit 001 and PFC inductors (L1, L2 and L3), and are rectified by diodes (D1-D6) which are connected with the insulated gate bipolar transistors (Q1-Q6) in an anti-parallel mode to charge a direct current energy storage capacitor C1.
In the embodiment provided by the application, the on-off of the insulated gate bipolar transistors (Q1-Q6) is completed by the high-speed digital signal processing chip, and the high-speed digital signal processing chip completes the rectification work or inversion work of the active front-end rectification units (111, 112) by controlling the on-off of the insulated gate bipolar transistors (Q1-Q6), so that high-precision controllable rectification and inversion are realized, and the power factor of the system is improved.
After three-phase alternating current power supplies R, S and T are input, the three-phase alternating current power supplies enter a rectification and inverter 002, the high-speed digital signal processing chip can realize charging and discharging of PFC inductors (L1, L2 and L3) and charging and discharging of a direct current energy storage capacitor C1 by controlling on and off of insulated gate bipolar transistors (Q1-Q6) and matching with diodes (D1-D6). The high-speed digital signal processing chip can realize controllable rectification only by internally arranging an algorithm for controlling the on-off of the insulated gate bipolar transistors (Q1-Q6) corresponding to a rectification mode, for example:
when the R phase of the power supply is in the positive half cycle and the T phase is in the negative half cycle, the insulated gate bipolar transistor Q3 is switched on, current flows from the R phase to the diode D1 and flows to the T phase through the insulated gate bipolar transistor Q3, and the PFC inductors (L1, L2 and L3) are charged; after a certain time, the insulated gate bipolar transistor Q3 is turned off, at this time, the electric energy on the PFC inductor (L1, L2, L3) needs to be discharged, the current forms a loop from the PFC inductor (L1, L2, L3), the diode D1, the dc energy storage capacitor C1, the diode D6, the PFC inductor (L1, L2, L3), the T phase, and the R phase, and the current cannot change suddenly due to the inductance in the loop, and the original direction is still maintained, at this time, the electric energy on the PFC inductor (L1, L2, L3) is also charged to the dc energy storage capacitor C1, which is equivalent to that a charging power supply is superimposed on the dc energy storage capacitor C1 except for the three-phase ac power supply, and this is repeated many times, the voltage at the two ends of the dc energy storage capacitor C1 is more highly charged, and the time and the number of charging of the inductance are controlled to control the voltage of the dc energy storage capacitor C1.
If the voltage of the dc energy-storage capacitor C1 needs to be adjusted from high to low, the charging of the PFC inductors (L1, L2, L3) can be stopped, so that the energy on the dc energy-storage capacitor C1 is inversely converted back to the power grid or consumed on the voltage-sharing resistor R1.
Similarly, the high-speed digital signal processing chip can realize controllable inversion by only internally arranging an algorithm for controlling the on-off of the insulated gate bipolar transistors (Q1-Q6) corresponding to the inversion mode, controls the on-off of the insulated gate bipolar transistors (Q1-Q6) according to a certain rule, inverts the direct-current bus voltage into alternating current with the phase and amplitude synchronous with the alternating current of the power grid and the same phase, and feeds the alternating current back to the power grid. During inversion, the electric energy is finally sent back to the power grid, so that the energy in the PFC inductors (L1, L2 and L3) is also sent back to the power grid.
In one embodiment of the present application, the ac power feedback module 100 further includes an electromagnetic interference filter 130 connected between the inverting and rectifying module and the power connection terminal 110.
An electromagnetic interference filter 130 (EMI filter) is disposed between the rectification and inversion module 120 and the power connection terminal 110 to filter the interference of the high frequency signal to the power grid.
In one embodiment of the present application, the ac power feedback module 100 further includes a four-quadrant electric meter 140 connected between the power connection terminal 110 and the emi filter 130.
The four-quadrant electric meter 140 is disposed between the power connection terminals 110 and the electromagnetic interference filter 130, and is used for monitoring the power consumed by the entire power control system and feeding back the power to the grid.
In one embodiment of the present application, the ac power feedback module 100 further comprises an ac limit switch connected between the four-quadrant electric meter and the emi filter 130.
The ac limit switch 150 is disposed between the four-quadrant electric meter 140 and the electromagnetic interference filter 130, and is used to disconnect the power supply of the elevator, thereby protecting the elevator.
In one embodiment of the present application, the power control system further includes a dc fuse 160 connected between the ac receiving and feedback module 100 and the frequency converter 200.
The dc fuse 160 is disposed between the ac feedback module 100 and the inverter 200 for preventing a short circuit of the system.
In one embodiment of the present application, the ac feedback module 100 is integrated into a plastic insulator housing.
The ac feedback module 100 is integrated in the plastic insulator housing, i.e. integrated as an external rectifier and inverter cabinet, which can conveniently upgrade the existing power control system, so as to quickly implement the energy feedback function.
In one embodiment of the present application, the ac power feedback module 100 further includes:
and a molded case circuit breaker 170 connected between the power connection terminal 110 and the rectification and inversion module 120.
Under the condition that all devices included in the alternating current feedback module 100 are packaged and integrated in a plastic insulator shell, the molded case circuit breaker 170 is arranged and used for automatically cutting off the current after the current exceeds a tripping set current value, and the effect of protecting the whole power supply control system is achieved.
By providing the power control system in the above embodiment, the electric energy generated by the reverse rotation of the driving motor 400 when the elevator descends can be collected and utilized by the power control system, thereby achieving the effects of high efficiency and energy saving. Meanwhile, the LC filter circuit and the PFC inductor included in the power control system can greatly reduce harmonic waves generated during frequency conversion; the power control system adopts the high-speed digital signal processing chip to control the rectification and inversion of the current, so that the control process is more accurate, the power factor is high, the redundant energy can be returned to the power grid to the maximum extent, and the energy-saving and consumption-reducing effects are obvious
Fig. 3 schematically shows a flowchart of a power control method according to an embodiment of the present application, and as shown in fig. 3, in an embodiment of the present application, there is provided a power control method applied to a power control system in the above embodiment, including:
step S101: acquiring bus voltage through a controller;
step S102: under the condition that the bus voltage does not reach a first voltage threshold value, the working mode of the active front-end rectifying units (111, 112) is controlled to be a rectifying mode through the controller, and the active front-end rectifying units (111, 112) are controlled to rectify alternating current input by a power grid through the power connection terminal 110 into direct current through the high-speed digital signal processing chip and output the direct current to the frequency converter 200;
step S103: under the condition that the bus voltage reaches the first voltage threshold value, the working mode of the active front end rectifying units (111, 112) is controlled to be an inversion mode through the controller, the active front end rectifying units (111, 112) are controlled through the high-speed digital signal processing chip to invert the direct current output to the rectifying and inverting module 120 of the frequency converter 200 into alternating current which is synchronous with the alternating current of the power grid and has the same phase, and the alternating current is fed back to the power grid through the power connection terminal 110.
The controllers in the active front-end rectifying units (111 and 112) determine the working mode rectifying mode or the inversion mode of the active front-end rectifying units (111 and 112) through the bus voltage of the direct-current bus, and the high-speed digital signal processing chip is switched on and off according to a certain rule according to the working mode insulated gate bipolar transistors (Q1-Q6) to carry out rectification or inversion.
In one embodiment of the present application, there is provided an elevator comprising the power control system of the above embodiment.
In a typical configuration, the elevator includes one or more processors (CPUs), an input/output interface, a network interface, and a memory.
The memory may include forms of volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.
Claims (12)
1. A power control system for an elevator, the system comprising:
the alternating current feedback module comprises a power supply connecting terminal and a rectification and inversion module connected with the power supply connecting terminal, and the power supply connecting terminal is used for being connected with a power grid;
the frequency converter is connected with the alternating current feedback module through a direct current bus and is connected with a driving motor of the lifter, and the frequency converter is used for outputting alternating current to the driving motor, rectifying alternating current generated by the driving motor in the descending process of the lifter into direct current and outputting the direct current to the alternating current receiving and feedback module;
the direct current bus is provided with a voltage detection device for detecting the bus voltage of the direct current bus;
the rectification and inversion module comprises two active front end rectification units, the active front end rectification units are connected with the frequency converter through the direct current bus, each active front end rectification unit comprises a controller and a high-speed digital signal processing chip, the controller is in communication connection with the voltage detection device and used for controlling the working mode of the active front end rectification unit to be a rectification mode or an inversion mode according to the bus voltage, and the high-speed digital signal processing chip is used for controlling the active front end rectification unit to rectify alternating current input by a power grid into direct current and output the direct current to the frequency converter in the rectification mode and invert the direct current output by the frequency converter into alternating current with the same phase synchronous with the alternating current of the power grid and feed back the alternating current to the power grid through the power connection terminal in the inversion mode.
2. The system of claim 1, wherein the active front-end rectification unit comprises a rectification and inverter and a dc energy storage capacitor, the rectification and inverter is connected to the power connection terminal, the rectification and inverter is further connected to the frequency converter through the dc bus, the dc energy storage capacitor is connected in parallel with the rectification and inverter, the rectification and inverter comprises a plurality of insulated gate bipolar transistors controlled to be turned on and off by the high-speed digital signal processing chip, and each insulated gate bipolar transistor is connected in anti-parallel with a diode.
3. The system of claim 2, wherein the active front-end rectification unit further comprises an LC filter circuit and a PFC inductor, the LC filter circuit and the PFC inductor being connected in sequence between the power connection terminal and the rectification and inverter.
4. The system of claim 1, wherein the ac feedback module further comprises an emi filter coupled between the rectifying and inverting module and the power connection terminal.
5. The system of claim 4, wherein the AC feedback module further comprises a four-quadrant ammeter coupled between the power connection terminals and the EMI filter.
6. The system of claim 5, wherein the AC feedback module further comprises an AC limit switch coupled between the four-quadrant electric meter and the EMI filter.
7. The system of claim 1, wherein the two active front-end rectification units are communicatively connected to each other so as to keep the phases of the output power, the output voltage, and the output current of the two active front-end rectification units consistent.
8. The system of claim 1, wherein the ac feedback module further comprises a dc fuse connected between the ac receiving and feedback module and the inverter.
9. The system of claim 1, wherein the ac feedback module is integrated into a plastic insulator housing.
10. The system of claim 9, wherein the ac feedback module further comprises:
and the molded case circuit breaker is connected between the power connection terminal and the rectification and inversion module.
11. An elevator characterized by comprising a power control system according to any one of claims 1 to 10.
12. A power supply control method applied to the power supply control system according to any one of claims 1 to 10, the method comprising:
acquiring the bus voltage through the controller;
under the condition that the bus voltage does not reach a first voltage threshold value, the working mode of the active front-end rectifying unit is controlled to be a rectifying mode through the controller, and the active front-end rectifying unit is controlled to rectify alternating current input by a power grid through the power supply connecting terminal into direct current through the high-speed digital signal processing chip and output the direct current to the frequency converter;
under the condition that the bus voltage reaches the first voltage threshold, the working mode of the active front-end rectifying unit is controlled to be an inversion mode through the controller, the active front-end rectifying unit is controlled to invert direct current output to the rectifying and inverting module by the high-speed digital signal processing chip, and the direct current is converted into alternating current which is synchronous with alternating current of the power grid and has the same phase with the alternating current of the power grid, and the alternating current is fed back to the power grid through the power supply connecting terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211358820.9A CN115694244A (en) | 2022-11-01 | 2022-11-01 | Elevator and power supply control system and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211358820.9A CN115694244A (en) | 2022-11-01 | 2022-11-01 | Elevator and power supply control system and method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115694244A true CN115694244A (en) | 2023-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211358820.9A Pending CN115694244A (en) | 2022-11-01 | 2022-11-01 | Elevator and power supply control system and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115694244A (en) |
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2022
- 2022-11-01 CN CN202211358820.9A patent/CN115694244A/en active Pending
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