CN113541505B - Brake power supply for construction elevator and control method - Google Patents
Brake power supply for construction elevator and control method Download PDFInfo
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- CN113541505B CN113541505B CN202110626798.0A CN202110626798A CN113541505B CN 113541505 B CN113541505 B CN 113541505B CN 202110626798 A CN202110626798 A CN 202110626798A CN 113541505 B CN113541505 B CN 113541505B
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- 238000010276 construction Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 12
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- 238000010586 diagram Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 230000010354 integration Effects 0.000 description 1
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Elevator Control (AREA)
Abstract
The invention discloses a brake power supply for a construction elevator and a control method, wherein the brake power supply comprises a 380V power supply, a switch S1, a switch S2, a rectification module, an IGBT switch Q1, an IGBT switch Q2, an IGBT switch Q3, an IGBT switch Q4 and a diode, the 380V power supply is connected with the input end of the rectification module through the switch S1 and the switch S2, the output end of the rectification module is + connected with the drain electrode of the IGBT switch Q1, and the source electrode of the IGBT switch Q1 is connected with the drain electrode of the diode and the drain electrode of the IGBT switch Q3; secondly, the independent chip is used for controlling and protecting the brake power supply, so that the stability and the safety of brake control are improved. Particularly, in the aspect of software control, a more accurate closed-loop control mode is adopted to realize stable and reliable direct-current output voltage.
Description
Technical Field
The invention relates to the technical field of power supply control, in particular to a brake power supply for a construction elevator and a control method.
Background
At present, the construction elevator for building is driven by adopting an asynchronous motor, and a speed reducer and a brake are arranged at the upper rear end of a mechanical mechanism of the asynchronous motor. The brake control of the construction elevator is particularly critical, and if the brake at the tail end of the motor is in a problem, if the brake torque is insufficient, the construction elevator can slide down and slide. The driving integrated machine of the construction elevator needs a switch for reasonably controlling the brake, thereby realizing the stability and safety of the operation of the construction elevator. Generally, a brake at the tail end of a motor for a construction elevator is switched on and off by a mode of switching on and off a direct current power supply, an input power supply in a driver of the construction elevator is generally a three-phase 380V input type, a traditional brake power supply adopts a transformer mode to reduce voltage, and then the direct current power supply is output through uncontrolled rectification.
Disclosure of Invention
The invention aims to provide a brake power supply for a construction elevator and a control method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a brake power supply for construction elevator, including the 380V power, switch S1, switch S2, rectifier module, IGBT switch Q1, IGBT switch Q2, IGBT switch Q3, IGBT switch Q4 and diode D, include that the 380V power passes through switch S1 and switch S2 and connects rectifier module 'S input, rectifier module' S output + connects IGBT switch Q1 'S drain electrode, IGBT switch Q1' S source electrode connects diode D 'S negative pole and IGBT switch Q3' S drain electrode, IGBT switch Q3 'S source electrode connects motor brake module, rectifier module' S output-connection IGBT switch Q2 'S source electrode, IGBT switch Q2' S drain electrode connects diode D 'S positive pole and IGBT switch Q4' S source electrode, IGBT switch Q4 'S drain electrode connects motor brake module' S the other end, IGBT switch Q1, IGBT switch Q2, IGBT switch Q3, IGBT switch Q4 'S grid all connects the controller, the output voltage of 380V power is Urs, IGBT switch Q3' S source voltage is Udc.
As a further technical scheme of the invention: the switch S1 and the switch S2 are relay switches.
As a further technical scheme of the invention: the rectification module is a single-phase uncontrolled rectifier bridge consisting of four rectifier diodes.
As a further technical scheme of the invention: the diode D is a reverse freewheeling diode.
As a further technical scheme of the invention: the controller comprises a phase-locked loop, a PI controller, a filter LPF and a PWM module, wherein the input end of the phase-locked loop is connected with the voltage Urs to obtain the phase theta of the power grid grid After the Udc passes through the low-pass filter LPF, the voltage is compared with a given voltage UdcRef and enters a PI controller, and the result of PI output generates a corresponding PWM wave and a phase theta grid And outputs PWM control signals together through the signal generating module X.
As a further technical scheme of the invention: the phase-locked loop comprises a second-order generalized integrator SOGI and a software phase-locked loop SPLL.
A brake power supply control method for a construction elevator is characterized in that the power supply is adopted, RS line voltage Urs in a three-phase input power supply is collected and sent to a phase-locked loop, phase locking is achieved in a mode of combining a second-order generalized integrator SOGI and a software phase-locked loop SPLL, and the phase theta of a power grid is obtained grid After the collected feedback Udc is low-pass filtered LPF, it is compared with given voltage UdcRef and fed into PI controller, and the PI outputThe result generates corresponding PWM wave, udc passes through low pass filter LPF, then is compared with given voltage UdcRef and enters PI controller, the result of PI output generates corresponding PWM wave and phase theta grid And the PWM control signal is output through the signal generating module X together to control IGBT switches Q1-Q4, so that stable 200V direct-current voltage output is realized.
Compared with the prior art, the invention has the beneficial effects that:
1. the cost of brake scheme design is optimized, and the brake power supply is lighter and more miniaturized. The transformer type voltage reduction device is more beneficial to engineering realization and product installation, and most of the original design in the industry adopts a transformer mode to reduce voltage, and a power electronic controllable rectification voltage reduction scheme is innovatively adopted;
2. the reliability of brake control is improved, the brake power supply, the brake control circuit and the service life of motor brake are prolonged, the design scheme control method adopts a closed-loop controllable mode to output power supply, is different from the traditional mode of uncontrolled rectification and is limited by the change of the voltage of a front-end power grid;
3. the safety of brake control is enhanced, an independent chip is adopted for software design of a brake control part, multi-directional information is collected for software function safety consideration, information of an input end and an output end is monitored, and both the input end and the output end can be effectively protected in time regardless of abnormity of the input end and the output end;
4. the brake control rapidity is improved, the switch of the conventional brake control switch is realized by controlling the on-off of the relay, and the mechanical delay of the relay is far longer than the on-off time of the IGBT, so that the brake control rapidity is greatly improved.
Drawings
Fig. 1 is a topological structure diagram of a brake power supply of a construction elevator.
Fig. 2 is a frame diagram of a construction elevator brake power supply control.
FIG. 3 is a schematic diagram of a single-phase software phase-locked loop of a brake power supply.
FIG. 4 is a flow chart of the brake power control software for the construction hoist.
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.
Example 1: please refer to fig. 1, a brake power supply for a construction elevator, which includes a 380V power supply, a switch S1, a switch S2, a rectifier module, an IGBT switch Q1, an IGBT switch Q2, an IGBT switch Q3, an IGBT switch Q4 and a diode D, the 380V power supply is connected to an input end of the rectifier module through the switch S1 and the switch S2, an output end + of the rectifier module is connected to a drain electrode of the IGBT switch Q1, a source electrode of the IGBT switch Q1 is connected to a cathode of the diode D and a drain electrode of the IGBT switch Q3, a source electrode of the IGBT switch Q3 is connected to a motor brake module, an output end-of the rectifier module is connected to a source electrode of the IGBT switch Q2, a drain electrode of the IGBT switch Q2 is connected to an anode of the diode D and a source electrode of the IGBT switch Q4, a drain electrode of the IGBT switch Q4 is connected to another end of the motor brake module, gates of the IGBT switch Q1, the IGBT switch Q2, the IGBT switch Q3 and the IGBT switch Q4 are all connected to a controller, an output voltage of the 380V power supply is Urs, and a source voltage of the IGBT switch Q3 is Udc.
Wherein S1 and S2 are relay switches, 4 diodes are single-phase uncontrolled rectifier bridges, Q1 and Q2 are IGBT tubes for controlling wave emission In positive and negative directions respectively, the latter stage collects In and Ip as positive output current and negative output current respectively, Q3 and Q4 are IGBT with positive and negative control output conducting switch respectively, and Udc is collected output direct current voltage. The scheme without the transformer is a hardware precondition for realizing controllable rectification and voltage reduction.
The invention also discloses a brake power supply control method for the construction elevator, which adopts the power supply to collect RS line voltage Urs in a three-phase input power supply and send the RS line voltage Urs into a phase-locked loop, realizes phase locking by adopting a mode of combining a second-order generalized integrator SOGI and a software phase-locked loop SPLL, and obtains the phase theta of a power grid grid After low-pass filtering LPF is carried out on the collected feedback Udc, the collected feedback Udc is compared with a given voltage UdcRef and then enters a PI controller,the result of PI output generates corresponding PWM wave, udc is compared with given voltage UdcRef after low pass filtering LPF and enters into PI controller, the result of PI output generates corresponding PWM wave and phase theta grid And the PWM control signal is output through the signal generating module X together to control IGBT switches Q1-Q4, so that stable 200V direct-current voltage output is realized.
As shown in fig. 4, the specific operation mode is firstly power-on initialization, operations such as initial value assignment of data calculation, power-on short-circuit detection to ground, power grid abnormal detection and the like are performed, and after the operation detection is normal, the shutdown state is skipped. The software starts data acquisition and other works in a shutdown state, jumps to a standby state after judging that no abnormity of data acquisition exists, starts to judge whether a software phase-locked loop succeeds in phase locking in the standby state, allows the jump operation state to start wave generation to establish output voltage after the software phase locking succeeds, and can interact information with another control chip serving as an upper computer at the moment to determine whether to output the on-off state of Q3 and Q4 so as to enable a brake action switch. Under-voltage, over-current and other fault detection is carried out in the running state and the standby state, whether the machine is stopped or not is selected according to the fault design condition, and the wave generation and output turn-off control IGBT is turned off in the stopped state, so that the brake power supply is timely and effectively guaranteed to be turned off.
Example 3, as shown in FIG. 3, is a process of software phase locking, where in SOGI, k is the adjustment scaling factor, ω 0 For the resonant frequency of the SOGI, quadrature voltage components u can be obtained after integration α ，u β The method is used for controlling a next-stage software phase-locked loop, obtains direct-current component voltages Ud and Uq after Park conversion, and controls the q-axis voltage to be 0 by utilizing the idea of software phase locking, wherein omega is in the figure e For the frequency of the power grid voltage, the convergence process of the phase-locked loop can be accelerated, generally, the phase-locked loop needs to be converted into a transfer function of a continuous domain as shown in a formula 1, and then a bilinear transformation method can be adopted to discretize the phase-locked loop.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (7)
1. The utility model provides a brake power supply for construction elevator, includes 380V power, switch S1, switch S2, rectifier module, IGBT switch Q1, IGBT switch Q2, IGBT switch Q3, IGBT switch Q4 and diode D, its characterized in that, 380V power passes through switch S1 and switch S2 and connects rectifier module ' S input, rectifier module ' S output + connects IGBT switch Q1 ' S drain electrode, IGBT switch Q1 ' S source electrode connects diode D ' S negative pole and IGBT switch Q3 ' S drain electrode, IGBT switch Q3 ' S source electrode connects motor brake module, rectifier module ' S output-connection IGBT switch Q2 ' S source electrode, diode D ' S positive pole and IGBT switch Q4 ' S source electrode are connected to IGBT switch Q2 ' S drain electrode, IGBT switch Q4 ' S drain electrode connects the other end of motor brake module, IGBT switch Q1, IGBT switch Q2, IGBT switch Q3, IGBT switch Q4 ' S grid all connects the controller, 380V power output voltage is Urs, IGBT switch Q3 ' S source electrode voltage is Udc.
2. The brake power supply for construction elevator according to claim 1, wherein the switch S1 and the switch S2 are relay switches.
3. The brake power supply for the construction elevator as claimed in claim 1, wherein the rectification module is a single-phase uncontrolled rectifier bridge consisting of four rectifier diodes.
4. The brake power supply for a construction elevator according to claim 1, wherein the diode D is a reverse freewheeling diode.
5. The brake power supply for the construction elevator as claimed in claim 1, wherein the controller includes a phase locked loop, a PI controller, a filter LPF and a PWM module, the input end of the phase locked loop is connected to the voltage Urs to obtain the phase of the power grid
After the Udc passes through the low-pass filter LPF, the voltage is compared with a given voltage UdcRef and enters a PI controller, and the result output by the PI generates a corresponding PWM wave and a phase position ^ greater or less>
And outputs PWM control signals together through the signal generating module X.
6. The brake power supply for construction elevator as claimed in claim 5, wherein the phase locked loop comprises a second order generalized integrator SOGI and a software phase locked loop SPLL.
7. A brake power supply control method for a construction elevator is characterized in that the power supply of any one of claims 1 to 6 is adopted, RS line voltage Urs in a three-phase input power supply is collected and sent to a phase-locked loop, phase locking is realized by adopting a mode of combining a second-order generalized integrator SOGI and a software phase-locked loop SPLL, and the phase of a power grid is obtained
After the collected feedback Udc is low-pass filtered LPF, it is compared with given voltage UdcRef and fed into PI controller, and the result of PI output can produce correspondent PWM wave and phase position
And the PWM control signal is output through the signal generating module X together to control IGBT switches Q1-Q4, so that stable 200V direct-current voltage output is realized. />
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| CN202110626798.0A CN113541505B (en) | 2021-06-04 | 2021-06-04 | Brake power supply for construction elevator and control method |
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| CN202110626798.0A CN113541505B (en) | 2021-06-04 | 2021-06-04 | Brake power supply for construction elevator and control method |
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| CN113541505B true CN113541505B (en) | 2023-04-07 |
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