CN109921718B - Method and system for adjusting variable working frequency switching compensation angle of escalator - Google Patents
Method and system for adjusting variable working frequency switching compensation angle of escalator Download PDFInfo
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- CN109921718B CN109921718B CN201711321418.2A CN201711321418A CN109921718B CN 109921718 B CN109921718 B CN 109921718B CN 201711321418 A CN201711321418 A CN 201711321418A CN 109921718 B CN109921718 B CN 109921718B
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Abstract
The invention relates to a method and a system for adjusting a variable working frequency switching compensation angle of an escalator, wherein the method for adjusting the variable working frequency switching compensation angle of the escalator comprises the following steps: performing variable-frequency switching on the escalator according to related parameters to obtain the vibration acceleration of the escalator at the moment of variable-frequency switching; the related parameters comprise a switching compensation angle corresponding to the current adjustment; when the absolute value of the vibration acceleration is larger than or equal to the vibration acceleration threshold, comparing the absolute value of the vibration acceleration with the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment; determining an adjusting mode for adjusting the switching compensation angle corresponding to the current adjustment according to the comparison result to obtain the switching compensation angle corresponding to the next adjustment; the adjusting mode comprises increasing a preset adjusting angle and reducing the preset adjusting angle; and when the vibration acceleration with the absolute value smaller than the vibration acceleration threshold is obtained, confirming the switching compensation angle corresponding to the vibration acceleration with the absolute value smaller than the vibration acceleration threshold as the final switching compensation angle.
Description
Technical Field
The invention relates to the field of escalator control, in particular to a method and a system for adjusting a variable working frequency switching compensation angle of an escalator.
Background
At present, the use of escalators in public places is more and more common, and in order to save energy and protect environment, when nobody takes for a long time, the escalator runs at a low speed, and is supplied with power by a frequency converter, and when someone takes, the escalator runs at a high speed and is switched to a power frequency power supply for power supply.
When the escalator is switched from frequency conversion drive to power frequency drive operation, in order to reduce the large amplitude jitter of the escalator caused by power supply switching, the traditional method is to monitor the frequency and the phase of power supply of a frequency converter, make the frequency and the phase of the power supply of the frequency converter close to the frequency and the phase of a power frequency power supply, and switch the power supply to complete the power frequency conversion switching after adding a switching compensation angle into the output phase of the frequency converter.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the switching compensation angle of the escalator is different due to the inherent difference of each device, the inherent difference comprises the motor factor of the escalator, the existence of a filter at the output end of a frequency converter and the like, and in practical application, the switching compensation angle is obtained by continuously adjusting according to the vibration caused by artificial feeling when the escalator changes into power frequency switching. The method has high labor cost, long time consumption, low adjustment efficiency and is inconvenient for large-scale popularization.
Disclosure of Invention
Therefore, it is necessary to provide a method and a system for adjusting a variable working frequency switching compensation angle of an escalator, aiming at the problem that the switching compensation angle is time-consuming and has a long service life and a low efficiency.
In order to achieve the above object, in one aspect, an embodiment of the present invention provides a method for adjusting a power frequency conversion switching compensation angle of an escalator, including the following steps:
performing variable-frequency switching on the escalator according to related parameters to obtain the vibration acceleration of the escalator at the moment of variable-frequency switching; the related parameters comprise a switching compensation angle corresponding to the current adjustment;
when the absolute value of the vibration acceleration is larger than or equal to the vibration acceleration threshold, comparing the absolute value of the vibration acceleration with the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment;
determining an adjusting mode for adjusting the switching compensation angle corresponding to the current adjustment according to the comparison result to obtain the switching compensation angle corresponding to the next adjustment; the adjusting mode comprises increasing a preset adjusting angle and reducing the preset adjusting angle;
and when the vibration acceleration with the absolute value smaller than the vibration acceleration threshold is obtained, confirming the switching compensation angle corresponding to the vibration acceleration with the absolute value smaller than the vibration acceleration threshold as the final switching compensation angle.
In one embodiment, the step of performing the first power frequency conversion on the escalator according to the relevant parameters to obtain the vibration acceleration of the escalator at the first power frequency conversion switching moment comprises the following steps:
performing variable-frequency switching on the escalator according to a preset switching compensation angle;
and the number of the first and second groups,
the step of obtaining the vibration acceleration of the escalator at the first time of power frequency change switching moment further comprises the following steps:
and when the absolute value of the vibration acceleration of the escalator at the first time of power frequency conversion switching is greater than or equal to the vibration acceleration threshold, increasing or decreasing the preset switching compensation angle by a preset adjustment angle to obtain a switching compensation angle corresponding to the second adjustment.
In one embodiment, the relevant parameters further include an output voltage frequency of the frequency converter, a corrected output voltage phase of the frequency converter, and a voltage phase of the power frequency power supply;
the corrected output voltage phase of the frequency converter is the sum of the output voltage phase of the frequency converter and the switching compensation angle corresponding to the current adjustment.
In one embodiment, the step of performing variable frequency switching on the escalator according to the relevant parameters and acquiring the vibration acceleration of the escalator at the moment of variable frequency switching comprises the following steps:
when the output voltage frequency of the frequency converter, the corrected output voltage phase of the frequency converter and the voltage phase of the power frequency power supply meet the switching conditions, controlling the escalator to carry out variable power frequency switching;
acquiring a first running speed of the escalator before the work frequency changing switching and a second running speed of the escalator after the work frequency changing switching;
obtaining the vibration acceleration of the escalator at the moment of the work frequency conversion switching according to the first running speed, the second running speed and the work frequency conversion switching time;
and the switching condition is that the output voltage frequency of the frequency converter is a preset frequency, and the absolute value of the difference value of the corrected output voltage phase of the frequency converter and the voltage phase of the power frequency power supply is smaller than the switching angle difference threshold.
In one embodiment, the step of determining an adjustment mode for adjusting the switching compensation angle corresponding to the current adjustment according to the comparison result to obtain the next switching compensation angle corresponding to the adjustment includes:
when the absolute value of the vibration acceleration is larger than the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment, adjusting the switching compensation angle corresponding to the current adjustment by adopting an adjustment mode opposite to the previous adjustment;
or
And when the absolute value of the vibration acceleration is smaller than the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment, adjusting the switching compensation angle corresponding to the current adjustment in the same adjusting mode as the previous adjustment.
In one embodiment, the preset adjustment angle ranges from 1 degree to 10 degrees.
On the other hand, the embodiment of the invention also provides an automatic escalator power frequency switching compensation angle adjusting system, which comprises:
the vibration acceleration acquisition unit is used for carrying out work frequency conversion switching on the escalator according to related parameters and acquiring the vibration acceleration of the escalator at the work frequency conversion switching moment; the related parameters comprise a switching compensation angle corresponding to the current adjustment;
the vibration acceleration comparison unit is used for comparing the absolute value of the vibration acceleration with the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment when the absolute value of the vibration acceleration is greater than or equal to the vibration acceleration threshold;
the adjusting unit is used for determining an adjusting mode for adjusting the switching compensation angle corresponding to the current adjustment according to the comparison result of the vibration acceleration comparing unit to obtain a switching compensation angle corresponding to the next adjustment; the adjusting mode comprises increasing a preset adjusting angle and reducing the preset adjusting angle;
and an adjustment result confirming unit which confirms the switching compensation angle corresponding to the vibration acceleration with the absolute value smaller than the vibration acceleration threshold as the final switching compensation angle when the vibration acceleration with the absolute value smaller than the vibration acceleration threshold is obtained.
In one embodiment, the vibration acceleration acquisition unit is used for performing power frequency conversion switching on the escalator according to a preset switching compensation angle in the step of performing first power frequency conversion switching on the escalator according to related parameters and acquiring the vibration acceleration of the escalator at the first power frequency conversion switching moment;
and the adjusting unit is used for increasing or decreasing the preset adjusting angle to the preset switching compensation angle when the absolute value of the vibration acceleration of the escalator at the first time of power frequency conversion switching is greater than or equal to the vibration acceleration threshold value, so as to obtain the switching compensation angle corresponding to the second time of adjustment.
In one aspect, an embodiment of the present invention provides an escalator controller, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the steps of the escalator frequency-changing switching compensation angle adjustment method when executing the program.
In another aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the above method for adjusting the frequency-changing switching compensation angle of an escalator.
One of the above technical solutions has the following advantages and beneficial effects:
the invention relates to a method and a system for adjusting a variable working frequency switching compensation angle of an escalator, which are used for carrying out variable working frequency switching on the escalator according to relevant parameters including a switching compensation angle corresponding to the current adjustment, acquiring the vibration acceleration of the escalator at the moment of variable working frequency switching, and determining the adjustment mode of the switching compensation angle corresponding to the current adjustment according to the comparison result of the absolute value of the vibration acceleration and the absolute value of the vibration acceleration acquired according to the switching compensation angle corresponding to the previous adjustment, so that the switching compensation angle corresponding to the next adjustment is obtained, and finally the switching compensation angle corresponding to the vibration acceleration with the absolute value smaller than the vibration acceleration threshold value is obtained. Based on the invention, the switching compensation angle is adjusted through the vibration acceleration, the switching compensation angle corresponding to the vibration acceleration with the absolute value within the vibration acceleration threshold range is obtained and is confirmed as the final switching compensation angle, the adjustment efficiency of the final switching compensation angle can be effectively improved, and the time required by adjustment is reduced.
Drawings
FIG. 1 is a schematic flow chart of a method for adjusting a power frequency switching compensation angle of an escalator according to an embodiment;
fig. 2 is a schematic flow chart for obtaining vibration acceleration of the escalator at the moment of changing work frequency and switching in one embodiment;
fig. 3 is a schematic view of an adjustment flow of the method for adjusting the power frequency switching compensation angle of the escalator according to an embodiment;
fig. 4 is a schematic diagram of an escalator power frequency switching compensation angle adjustment system according to an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In order to solve the problem of low long-term efficiency when switching compensation angle adjustment is time-consuming, the invention provides an embodiment of a method for adjusting a variable working frequency switching compensation angle of an escalator, which comprises the following steps as shown in fig. 1:
step S110, performing variable-frequency switching on the escalator according to related parameters, and acquiring vibration acceleration of the escalator at the variable-frequency switching moment; the related parameters comprise a switching compensation angle corresponding to the current adjustment;
specifically, the vibration acceleration of the escalator at the time of the work frequency changing switching is the variable quantity of the running speed of the escalator at the time of the work frequency changing switching, and the running speed change of the escalator before and after the work frequency changing switching can be reflected, so that the vibration condition of the escalator during the work frequency changing switching is reflected. The adjustment process of each switching compensation angle comprises one time of work frequency changing switching of the escalator, each time of work frequency changing switching corresponds to one switching compensation angle, and the corresponding switching compensation angle can be correspondingly adjusted according to the change of the vibration acceleration value at the time of the work frequency changing switching of the escalator twice.
Step S120, when the absolute value of the vibration acceleration is larger than or equal to the vibration acceleration threshold, comparing the absolute value of the vibration acceleration with the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment;
specifically, the vibration acceleration threshold is a preset value and is used for judging whether the vibration of the escalator at the time of changing the work frequency is within an allowable range. For example, the vibration acceleration threshold value is 30gal, which means that the vibration acceleration in a range greater than-30 gal and less than 30gal is a value within the vibration acceleration threshold value range. When the absolute value of the vibration acceleration is greater than or equal to the vibration acceleration threshold, it indicates that the vibration acceleration value obtained according to the relevant parameters including the switching compensation angle corresponding to the current adjustment is too large, and the switching compensation angle corresponding to the current adjustment needs to be adjusted.
Step S130, according to the comparison result, determining an adjustment mode for adjusting the switching compensation angle corresponding to the current adjustment to obtain the switching compensation angle corresponding to the next adjustment; the adjusting mode comprises increasing a preset adjusting angle and reducing the preset adjusting angle;
specifically, according to the comparison result of the absolute value of the vibration acceleration and the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment, the corresponding adjustment mode of the switching compensation angle corresponding to the current adjustment is determined, and the switching compensation angle corresponding to the current adjustment is adjusted according to the adjustment mode to obtain the switching compensation angle corresponding to the next adjustment.
In step S140, when the vibration acceleration having the absolute value smaller than the vibration acceleration threshold is obtained, the switching compensation angle corresponding to the vibration acceleration having the absolute value smaller than the vibration acceleration threshold is determined as the final switching compensation angle.
Specifically, when the vibration acceleration with the absolute value smaller than the vibration acceleration threshold is obtained, the fact that the vibration of the escalator at the time of the work frequency changing switching is within the allowable range is explained, the switching compensation angle corresponding to the vibration acceleration with the absolute value smaller than the vibration acceleration threshold is confirmed as the final switching compensation angle, and the adjustment of the work frequency changing switching compensation angle of the escalator is completed.
The embodiment of the method for adjusting the variable-frequency switching compensation angle of the escalator comprises the steps of comparing the absolute value of the vibration acceleration with the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment, correspondingly adjusting the switching compensation angle corresponding to the current adjustment according to the comparison result, enabling the absolute value of the vibration acceleration to rapidly converge into a numerical range smaller than the vibration acceleration threshold, and when the vibration acceleration of which the absolute value is smaller than the vibration acceleration threshold is obtained, confirming the switching compensation angle corresponding to the vibration acceleration of which the absolute value is smaller than the vibration acceleration threshold as the final switching compensation angle to be finally obtained by the adjusting method. The final switching compensation angle is obtained without depending on manual operation and judgment, so that the labor cost is reduced, compared with manual debugging, the final switching compensation angle can be obtained more quickly, the adjustment efficiency of the final switching compensation angle is effectively improved, and the time required by adjustment is shortened.
In a specific embodiment, the step of performing the first power frequency conversion on the escalator according to the relevant parameters to obtain the vibration acceleration of the escalator at the first power frequency conversion switching moment comprises the following steps:
performing variable-frequency switching on the escalator according to a preset switching compensation angle;
and
the method also comprises the following steps after the vibration acceleration of the escalator at the first time of power frequency change switching is obtained:
and when the absolute value of the vibration acceleration of the escalator at the first time of power frequency conversion switching is greater than or equal to the vibration acceleration threshold, increasing or decreasing the preset switching compensation angle by a preset adjustment angle to obtain a switching compensation angle corresponding to the second adjustment.
Specifically, each adjustment process of the switching compensation angle comprises one time of work frequency changing switching of the escalator, and the first work frequency changing switching of the escalator is carried out in the first adjustment process. The escalator is switched according to relevant parameters including a preset switching compensation angle for the first time of power frequency conversion switching. The preset switching compensation angle is the switching compensation angle corresponding to the first adjustment.
The method comprises the steps of carrying out first-time power frequency conversion on the escalator according to relevant parameters including a preset conversion compensation angle, obtaining vibration acceleration of the escalator at the first-time power frequency conversion switching moment, and increasing or decreasing the preset adjustment angle to the preset conversion compensation angle when the absolute value of the vibration acceleration at the first-time power frequency conversion switching moment is larger than or equal to a vibration acceleration threshold value. And taking the adjusted preset switching compensation angle as a switching compensation angle corresponding to the second adjustment, and obtaining the vibration acceleration of the escalator corresponding to the second adjustment at the second time of power frequency conversion switching moment. When the absolute value of the vibration acceleration at the second time of the escalator power frequency conversion switching is larger than or equal to the vibration acceleration threshold, comparing the absolute value of the vibration acceleration at the first time of the power frequency conversion switching corresponding to the first adjustment with the absolute value of the vibration acceleration at the second time of the power frequency conversion switching corresponding to the second adjustment, adjusting the switching compensation angle corresponding to the second adjustment according to the comparison result, and finally obtaining the final switching compensation angle enabling the absolute value of the vibration acceleration to be smaller than the vibration acceleration threshold through accumulation of the adjustment times.
In a specific embodiment, the related parameters further include an output voltage frequency of the frequency converter, a corrected output voltage phase of the frequency converter, and a voltage phase of the power frequency power supply;
the corrected output voltage phase of the frequency converter is the sum of the output voltage phase of the frequency converter and the switching compensation angle corresponding to the current adjustment.
Specifically, the switching compensation angle in the relevant parameters is updated along with each adjustment, the numerical values of other relevant parameters are detected before the escalator is switched with the working frequency, and when the relevant parameters all meet the switching conditions, the working frequency and the frequency conversion of the escalator are switched.
In one embodiment, before the escalator is switched between work frequency and work frequency, the escalator is powered by a frequency converter, the frequency of the output voltage of the frequency converter is equal to the running frequency of an escalator motor, and the frequency is acquired by controlling an encoder connected with the escalator motor.
In one embodiment, before the escalator changes to power frequency, the escalator motor is powered by a frequency converter, and the phase of the output voltage of the motor is equal to that of the output voltage of the frequency converter. Therefore, the process of obtaining the output voltage phase of the frequency converter includes: the control encoder acquires motor displacement information, and the motor side ammeter acquires motor output current; obtaining the mechanical speed of the motor according to the displacement information of the motor; obtaining a motor slip angle according to the motor output current; obtaining the electrical speed of the motor according to the mechanical speed of the motor and the slip angle of the motor; and then, the phase of the output voltage of the motor is obtained according to the electrical speed integral of the motor, so that the phase of the output voltage of the frequency converter is obtained.
In one embodiment, the obtaining of the voltage phase of the power frequency power supply comprises: any two paths of input voltage signals of the three-phase power frequency power supply are collected through an analog/digital conversion detection device; obtaining a third input voltage signal according to the two input voltage signals; performing CLARK conversion on the three paths of input voltage signals to obtain two voltage amplitudes converted into two phase rectangular coordinate systems; and dividing the two voltage amplitudes in the two-phase rectangular coordinate system, and performing arc tangent calculation to obtain the voltage phase of the power frequency power supply.
In a specific embodiment, as shown in fig. 2, the step of performing variable frequency switching on the escalator according to the relevant parameters and acquiring the vibration acceleration of the escalator at the moment of variable frequency switching comprises:
step S210, when the output voltage frequency of the frequency converter, the corrected output voltage phase of the frequency converter and the voltage phase of the power frequency power supply meet the switching conditions, controlling the escalator to carry out variable power frequency switching;
step S220, acquiring a first running speed of the escalator before the work frequency conversion switching and a second running speed of the escalator after the work frequency conversion switching;
step S230, obtaining the vibration acceleration of the escalator at the moment of the work frequency conversion switching according to the first running speed, the second running speed and the work frequency conversion switching time;
and the switching condition is that the output voltage frequency of the frequency converter is a preset frequency, and the absolute value of the difference value of the corrected output voltage phase of the frequency converter and the voltage phase of the power frequency power supply is smaller than the switching angle difference threshold.
Specifically, when the output voltage frequency of the frequency converter is equal to the preset frequency, and the absolute value of the difference value between the corrected output voltage phase of the frequency converter and the voltage phase of the power frequency power supply is smaller than the switching angle difference threshold value, controlling an encoder connected with the motor of the escalator to acquire first displacement information of the motor of the escalator, differentiating the first displacement information to acquire the motor speed before switching of the motor of the escalator, acquiring the first running speed of the escalator according to the motor speed before switching of the motor and the current transmission ratio of the escalator, issuing a switching command, controlling a variable-frequency running contactor to be switched off, closing the power frequency running contactor, determining that the switching is finished after the preset switching time from issuing the switching command, controlling the encoder connected with the motor of the escalator to acquire the second displacement information of the motor of the escalator, differentiating the second displacement information to acquire the switched motor speed of the motor of the escalator, and obtaining a second running speed of the escalator according to the switched motor speed and the current transmission ratio of the escalator.
And dividing the difference value of the second running speed and the first running speed by the switching time according to the first running speed, the second running speed and the switching time of the variable work frequency switching to obtain the vibration acceleration of the escalator at the variable work frequency switching moment.
Wherein the switching angle difference threshold is a preset value.
Preferably, the switching angle difference threshold is set to 1 degree, and the preset frequency is set to 50.5 HZ.
The switching time is a preset value, timing is started when a switching instruction is issued, and after the preset switching time, the work frequency changing switching of the escalator is determined to be completed.
Preferably, the switching time ranges from 100 milliseconds to 200 milliseconds.
When the frequency conversion of the escalator is switched, the switching compensation angle and the output voltage phase of the frequency converter are added to judge whether the escalator can be switched with the frequency conversion, so that the size of the switching compensation angle can influence the size of the vibration acceleration at the time of frequency conversion switching of the escalator.
In a specific embodiment, the step of determining an adjustment mode for adjusting the switching compensation angle corresponding to the current adjustment according to the comparison result, and obtaining the switching compensation angle corresponding to the next adjustment includes:
when the absolute value of the vibration acceleration is larger than the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment, adjusting the switching compensation angle corresponding to the current adjustment by adopting an adjustment mode opposite to the previous adjustment;
or
And when the absolute value of the vibration acceleration is smaller than the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment, adjusting the switching compensation angle corresponding to the current adjustment in the same adjusting mode as the previous adjustment.
Specifically, when the absolute value of the vibration acceleration is greater than the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment, if the adjustment mode of the switching compensation angle corresponding to the previous adjustment is to increase the preset adjustment angle, the adjustment mode of the switching compensation angle corresponding to the current adjustment is to decrease the preset adjustment angle; if the adjustment mode of the switching compensation angle corresponding to the previous adjustment is to reduce the preset adjustment angle, the adjustment mode of the switching compensation angle corresponding to the current adjustment is to increase the preset adjustment angle.
When the absolute value of the vibration acceleration is smaller than the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment, if the adjustment mode of the switching compensation angle corresponding to the previous adjustment is to increase the preset adjustment angle, the adjustment mode of the switching compensation angle corresponding to the current adjustment is to increase the preset adjustment angle; if the adjustment mode of the switching compensation angle corresponding to the previous adjustment is also to reduce the preset adjustment angle, the adjustment mode of the switching compensation angle corresponding to the current adjustment is to reduce the preset adjustment angle.
And obtaining the variation trend of the absolute value of the vibration acceleration according to the absolute value of the vibration acceleration and the vibration acceleration obtained by adjusting the corresponding switching compensation angle in the previous time, and correspondingly adjusting the switching compensation angle corresponding to the current adjustment, so that the absolute value of the vibration acceleration can be more quickly converged into a numerical range smaller than the vibration acceleration threshold, the adjustment efficiency of the switching compensation angle is further improved, and the adjustment duration is reduced.
In a specific embodiment, the preset adjustment angle ranges from 1 degree to 10 degrees.
In a specific embodiment, the threshold value of the angle difference of the escalator for power frequency conversion switching is 1 degree, and the preset frequency is 50.5 Hz. The preset adjusting angle is 5 degrees. The preset switching compensation angle is 30 degrees.
Specifically, the process of performing the variable frequency switching compensation angle adjustment on an escalator by using the above parameters, as shown in fig. 3, may include the following steps:
step S310, performing first time of variable frequency switching of the escalator according to relevant parameters including a preset switching compensation angle (30 degrees) to obtain vibration acceleration of the first time of variable frequency switching of the escalator;
step S320, adjusting a switching compensation angle corresponding to the first adjustment, namely a preset switching compensation angle (30 degrees), and subtracting the preset adjustment angle (5 degrees) from the preset switching compensation angle (30 degrees) to obtain a switching compensation angle (25 degrees) corresponding to the second adjustment;
step S330, performing second time of work frequency conversion switching of the escalator according to related parameters including a second time of adjustment of a corresponding switching compensation angle (25 degrees), and obtaining vibration acceleration of the second time of work frequency conversion switching of the escalator;
step S340, the absolute value of the vibration acceleration of the second time of power frequency conversion switching of the escalator is larger than the absolute value of the vibration acceleration of the first time of power frequency conversion switching of the escalator, the adjusting mode of the switching compensation angle (25 degrees) corresponding to the second time of adjustment is opposite to the adjusting mode of the first time of adjustment, the preset adjusting angle (5 degrees) is added to the switching compensation angle (25 degrees) corresponding to the second time of adjustment, and the switching compensation angle (30 degrees) corresponding to the third time of adjustment is obtained;
step S350, performing third time of work frequency conversion switching of the escalator according to relevant parameters including a third time adjustment corresponding switching compensation angle (30 degrees), and obtaining vibration acceleration of the third time of work frequency conversion switching of the escalator;
step S360, the absolute value of the vibration acceleration of the escalator for the third time of power frequency conversion switching is smaller than the absolute value of the vibration acceleration of the escalator for the second time of power frequency conversion switching, the adjustment mode of the switching compensation angle (30 degrees) corresponding to the third time of adjustment is the same as the adjustment mode of the second time of adjustment, the preset adjustment angle (5 degrees) is added to the switching compensation angle (30 degrees) corresponding to the third time of adjustment, and the switching compensation angle (35 degrees) corresponding to the fourth time of adjustment is obtained;
step S370, performing fourth time of work frequency conversion switching of the escalator according to related parameters including a fourth time adjustment corresponding switching compensation angle (35 degrees), and obtaining vibration acceleration of the fourth time of work frequency conversion switching of the escalator;
and S380, confirming that the switching compensation angle (35 degrees) corresponding to the fourth adjustment is the final switching compensation angle when the absolute value of the vibration acceleration of the escalator for the fourth time of power frequency switching is smaller than the vibration acceleration threshold, and finishing the adjustment of the switching compensation angle for the escalator for the fourth time of power frequency switching.
The final switching compensation angle (35 degrees) is applied to the power frequency switching of the escalator, so that the escalator can keep stable operation before and after power frequency switching.
The work frequency changing switching method of the escalator comprises the following steps:
obtaining the output voltage frequency of the frequency converter, the voltage phase of the power frequency power supply and the output voltage phase of the frequency converter;
when the frequency of the output voltage of the frequency converter is equal to the preset frequency of 50.5HZ, adding the final switching compensation angle (35 degrees) and the phase of the output voltage of the frequency converter to obtain the phase of the corrected output voltage of the frequency converter;
when the absolute value of the difference between the corrected output voltage phase of the frequency converter and the voltage phase of the power frequency power supply is smaller than the switching angle difference threshold value of 1 degree, a switching command is issued, so that the frequency conversion operation contactor is controlled to be switched off, and the power frequency operation contactor is switched on.
In a specific embodiment, the vibration acceleration at the time of the escalator power frequency change switching is monitored in real time, the vibration condition of the escalator power frequency change switching is monitored through the value of the vibration acceleration, and whether the escalator is abnormal or not is monitored.
In a specific embodiment, the obtaining of the final switching compensation angle may be further obtained by:
taking 5 degrees as an interval, obtaining 72 switching compensation angles from 0 degree to 360 degrees;
respectively carrying out power frequency conversion switching on the escalator through the compensation angles to obtain corresponding vibration acceleration at 72 power frequency conversion switching moments of the escalator;
and comparing to obtain the absolute value of the minimum vibration acceleration, and determining the switching compensation angle corresponding to the vibration acceleration with the minimum absolute value as the final switching compensation angle.
Based on the technical scheme of the method for adjusting the variable power frequency switching compensation angle of the escalator, the embodiment of the invention also provides an automatic escalator variable power frequency switching compensation angle adjusting system, as shown in fig. 4, which comprises the following steps:
the vibration acceleration obtaining unit 410 is used for performing variable frequency switching on the escalator according to relevant parameters, and obtaining the vibration acceleration of the escalator at the moment of variable frequency switching; the related parameters comprise a switching compensation angle corresponding to the current adjustment;
a vibration acceleration comparison unit 420 for comparing the absolute value of the vibration acceleration with the absolute value of the vibration acceleration obtained according to the previous adjustment of the corresponding switching compensation angle when the absolute value of the vibration acceleration is greater than or equal to the vibration acceleration threshold;
an adjusting unit 430, configured to determine, according to the comparison result of the vibration acceleration comparing unit 420, an adjusting manner for adjusting the currently adjusted corresponding switching compensation angle, so as to obtain a next adjusted corresponding switching compensation angle; the adjusting mode comprises increasing a preset adjusting angle and reducing the preset adjusting angle;
when the vibration acceleration having an absolute value smaller than the vibration acceleration threshold is obtained, the adjustment result confirmation unit 440 confirms the switching compensation angle corresponding to the vibration acceleration having an absolute value smaller than the vibration acceleration threshold as the final switching compensation angle.
The escalator power frequency changing switching compensation angle adjusting system realizes the adjustment of a switching compensation angle by comparing the absolute value of the vibration acceleration at the previous escalator power frequency changing switching moment with the absolute value of the vibration acceleration at the current escalator power frequency changing switching moment, and obtains the vibration acceleration of the escalator at the power frequency changing switching moment by the vibration acceleration obtaining unit 410; the vibration acceleration comparison unit 420 compares the absolute value of the vibration acceleration with the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment; in the adjusting unit 430, according to the comparison result of the vibration acceleration comparing unit 420, the switching compensation angle corresponding to the current adjustment is adjusted to obtain the switching compensation angle corresponding to the next adjustment; finally, the switching compensation angle corresponding to the vibration acceleration with the absolute value smaller than the vibration acceleration threshold is obtained in the adjustment result confirmation unit 440, so that the final switching compensation angle is determined, and the adjustment of the switching compensation angle is completed. The efficiency of obtaining the final switching compensation angle is improved, and the time required by adjustment is greatly shortened
In one embodiment, the vibration acceleration obtaining unit 410 is further configured to perform power frequency conversion switching on the escalator according to a preset switching compensation angle in the step of performing the first power frequency conversion switching on the escalator according to the relevant parameters to obtain the vibration acceleration of the escalator at the first power frequency conversion switching time;
the adjusting unit 430 is further configured to increase or decrease the preset adjusting angle to the preset switching compensation angle when the absolute value of the vibration acceleration of the escalator at the first time of power frequency conversion switching is greater than or equal to the vibration acceleration threshold, so as to obtain a switching compensation angle corresponding to the second time of adjustment.
It should be noted that each unit module in the escalator power frequency switching compensation angle adjusting system of the present invention can correspondingly implement each process step in the escalator power frequency switching compensation angle adjusting method, and details are not repeated here.
In one embodiment, an escalator controller is further provided, which includes a memory, a processor and a computer program stored in the memory and operable on the processor, wherein the processor executes the program to implement any one of the escalator frequency-changing switching compensation angle adjusting methods in the above embodiments.
When the processor of the escalator controller executes a program, the escalator variable working frequency switching compensation angle adjusting method can be realized, so that the switching compensation angle can be continuously adjusted by detecting the vibration acceleration, the switching compensation angle corresponding to the vibration acceleration with the absolute value within the vibration acceleration threshold range is finally obtained and confirmed to be the final switching compensation angle, the adjusting efficiency of the final switching compensation angle can be effectively improved, and the time required by adjustment is reduced.
In addition, it can be understood by those skilled in the art that all or part of the processes in the methods of the above embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium, and as in the embodiments of the present invention, the program can be stored in the storage medium of a computer system and executed by at least one processor in the computer system, so as to implement the processes of the embodiments including the methods for adjusting the power frequency switching compensation angle of the respective dynamic escalator transformer.
In one embodiment, a storage medium is further provided, on which a computer program is stored, wherein the program is executed by a processor to implement any one of the escalator frequency conversion compensation angle adjustment methods in the above embodiments. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The computer storage medium and the stored computer program realize the processes of the embodiments of the method for adjusting the power frequency switching compensation angle of the respective dynamic escalator through detection of the vibration acceleration, so that the switching compensation angle can be continuously adjusted through detection of the vibration acceleration, the switching compensation angle corresponding to the vibration acceleration with the absolute value within the vibration acceleration threshold range is finally obtained and confirmed as the final switching compensation angle, the adjustment efficiency of the final switching compensation angle can be effectively improved, and the time required by adjustment is shortened.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for adjusting a variable working frequency switching compensation angle of an escalator is characterized by comprising the following steps:
the method comprises the steps that the escalator is subjected to work frequency changing switching according to relevant parameters, and the vibration acceleration of the escalator at the work frequency changing switching moment is obtained; the related parameters comprise a switching compensation angle corresponding to the current adjustment;
when the absolute value of the vibration acceleration is larger than or equal to the vibration acceleration threshold, comparing the absolute value of the vibration acceleration with the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment;
according to the comparison result, if the absolute value of the vibration acceleration is larger than the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment, the switching compensation angle corresponding to the current adjustment is adjusted in an adjustment mode opposite to the previous adjustment; if the absolute value of the vibration acceleration is smaller than the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment, adjusting the switching compensation angle corresponding to the current adjustment in the same adjustment mode as the previous adjustment; the adjusting mode comprises increasing a preset adjusting angle or reducing the preset adjusting angle;
and when the vibration acceleration with the absolute value smaller than the vibration acceleration threshold is obtained, confirming the switching compensation angle corresponding to the vibration acceleration with the absolute value smaller than the vibration acceleration threshold as a final switching compensation angle.
2. The escalator power frequency conversion switching compensation angle adjusting method according to claim 1, wherein the escalator power frequency conversion switching is performed for the first time according to relevant parameters, and the step of obtaining the vibration acceleration of the escalator at the time of the first power frequency conversion switching is that:
performing variable working frequency switching on the escalator according to a preset switching compensation angle;
and
the step of obtaining the vibration acceleration of the escalator at the first time of power frequency conversion switching moment further comprises the following steps:
and when the absolute value of the vibration acceleration of the escalator at the first time of power frequency conversion switching is greater than or equal to the vibration acceleration threshold, increasing or decreasing the preset switching compensation angle by the preset adjustment angle to obtain a switching compensation angle corresponding to the second adjustment.
3. The escalator power frequency conversion switching compensation angle adjusting method according to claim 1,
the related parameters also comprise the output voltage frequency of the frequency converter, the corrected output voltage phase of the frequency converter and the voltage phase of the power frequency power supply;
and the corrected output voltage phase of the frequency converter is the sum of the output voltage phase of the frequency converter and the switching compensation angle corresponding to the current adjustment.
4. The escalator power frequency conversion switching compensation angle adjusting method according to claim 3, wherein the step of performing power frequency conversion switching on the escalator according to related parameters and acquiring the vibration acceleration of the escalator at the power frequency conversion switching time comprises the steps of:
when the output voltage frequency of the frequency converter, the corrected output voltage phase of the frequency converter and the voltage phase of the power frequency power supply meet switching conditions, controlling the escalator to carry out variable power frequency switching;
acquiring a first running speed of the escalator before the power frequency conversion switching and a second running speed of the escalator after the power frequency conversion switching;
obtaining the vibration acceleration of the escalator at the time of the work frequency conversion switching according to the first running speed, the second running speed and the work frequency conversion switching time;
the switching condition is that the output voltage frequency of the frequency converter is a preset frequency, and the absolute value of the difference value between the corrected output voltage phase of the frequency converter and the voltage phase of the power frequency power supply is smaller than a switching angle difference threshold value.
5. The escalator power-frequency-change switching compensation angle adjusting method according to claim 3, wherein before the escalator power-frequency-change switching, the motor of the escalator is powered by the frequency converter, and the frequency of the output voltage of the frequency converter is equal to the motor operating frequency of the escalator; and the phase of the output voltage of the frequency converter is equal to the phase of the output voltage of the motor of the escalator.
6. The escalator power frequency conversion switching compensation angle adjusting method according to any one of claims 1-4, wherein the preset adjusting angle ranges from 1 degree to 10 degrees.
7. The utility model provides an automatic staircase becomes worker frequently and switches compensation angle adjustment system which characterized in that includes:
the vibration acceleration acquisition unit is used for carrying out work frequency conversion switching on the escalator according to related parameters and acquiring the vibration acceleration of the escalator at the work frequency conversion switching moment; the related parameters comprise a switching compensation angle corresponding to the current adjustment;
the vibration acceleration comparison unit is used for comparing the absolute value of the vibration acceleration with the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment when the absolute value of the vibration acceleration is greater than or equal to a vibration acceleration threshold value;
the adjusting unit is used for adjusting the switching compensation angle corresponding to the current adjustment in an adjusting mode opposite to the previous adjustment if the absolute value of the vibration acceleration is larger than the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment according to the comparison result of the vibration acceleration comparing unit; if the absolute value of the vibration acceleration is smaller than the absolute value of the vibration acceleration obtained according to the switching compensation angle corresponding to the previous adjustment, adjusting the switching compensation angle corresponding to the current adjustment in the same adjustment mode as the previous adjustment; the adjusting mode comprises increasing a preset adjusting angle or reducing the preset adjusting angle;
and the adjustment result confirming unit is used for confirming the switching compensation angle corresponding to the vibration acceleration with the absolute value smaller than the vibration acceleration threshold as the final switching compensation angle when the vibration acceleration with the absolute value smaller than the vibration acceleration threshold is obtained.
8. The escalator power frequency conversion switching compensation angle adjustment system according to claim 7,
the vibration acceleration acquisition unit is used for performing work frequency conversion switching on the escalator according to a preset switching compensation angle in the step of performing the first work frequency conversion switching on the escalator according to related parameters and acquiring the vibration acceleration of the escalator at the first work frequency conversion switching moment;
and the adjusting unit is used for increasing or decreasing the preset adjusting angle to the preset switching compensation angle when the absolute value of the vibration acceleration of the escalator at the first time of power frequency conversion switching is greater than or equal to the vibration acceleration threshold value, so as to obtain the switching compensation angle corresponding to the second time of adjustment.
9. An escalator control comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any one of claims 1 to 6 are carried out by the processor when the program is executed.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.
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