CN109921717B - Adjustment method and system for escalator variable power frequency switching compensation angle - Google Patents
Adjustment method and system for escalator variable power frequency switching compensation angle Download PDFInfo
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Abstract
本发明涉及一种自动扶梯变工频切换补偿角调整方法及系统，自动扶梯变工频切换补偿角调整方法，包括以下步骤：根据相关参数对自动扶梯进行变工频切换，获取自动扶梯电机在变工频切换过程中的电机冲击电流；相关参数包括当前调整对应的切换补偿角；在电机冲击电流大于电机冲击电流阈值时，比较电机冲击电流和根据前一次调整对应的切换补偿角获取的电机冲击电流；根据比较结果，确定调整当前调整对应的切换补偿角的调整方式，得到下一次调整对应的切换补偿角；调整方式包括增加预设调整角度和减少预设调整角度；在得到小于电机冲击电流阈值的电机冲击电流时，将小于电机冲击电流阈值的电机冲击电流对应的切换补偿角确认为最终切换补偿角。
The invention relates to a method and a system for adjusting the compensation angle of escalator variable power frequency switching. The method for adjusting the compensation angle of escalator variable power frequency switching includes the following steps: switching the escalator according to relevant parameters with variable power frequency, and obtaining the escalator motor in Motor inrush current in the process of power frequency switching; related parameters include the switching compensation angle corresponding to the current adjustment; when the motor inrush current is greater than the motor inrush current threshold, compare the motor inrush current with the motor obtained according to the corresponding switching compensation angle of the previous adjustment Inrush current; according to the comparison result, determine the adjustment method for adjusting the switching compensation angle corresponding to the current adjustment, and obtain the switching compensation angle corresponding to the next adjustment; the adjustment method includes increasing the preset adjustment angle and decreasing the preset adjustment angle; When the motor inrush current is lower than the current threshold, the switching compensation angle corresponding to the motor inrush current smaller than the motor inrush current threshold is confirmed 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 the switching compensation angle according to the shaking caused by artificial feeling during the power frequency switching of the escalator. 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 motor impact current of the escalator motor in the variable-frequency switching process; the related parameters comprise a switching compensation angle corresponding to the current adjustment;
when the motor impact current is larger than the motor impact current threshold, comparing the motor impact current with the motor impact current obtained according to the previous adjustment of the corresponding switching compensation angle;
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 motor impact current smaller than the motor impact current threshold is obtained, confirming the switching compensation angle corresponding to the motor impact current smaller than the motor impact current threshold as a 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 motor impact current of the escalator in the first power frequency conversion switching process comprises the following steps:
performing variable-frequency switching on the escalator according to a preset switching compensation angle;
and
the method for acquiring the motor impact current of the escalator in the first time of power frequency conversion switching process further comprises the following steps:
and when the motor impact current of the escalator in the first time of power frequency conversion switching process is larger than the motor impact current threshold value, increasing or reducing the preset adjustment angle to the preset switching compensation angle to obtain a switching compensation angle corresponding to the second time of 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 power frequency conversion switching on the escalator according to relevant parameters and acquiring the motor impact current of the escalator in the power frequency conversion switching process 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;
monitoring the motor output current of the escalator motor in the process of work frequency conversion switching, and obtaining the motor impact current of the escalator in the process of work frequency conversion switching according to the motor output current;
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 motor impact current is larger than the motor impact current obtained according to the switching compensation angle corresponding to the previous adjustment, adjusting the switching compensation angle corresponding to the current adjustment in an adjustment mode opposite to the previous adjustment;
or
And when the motor impact current is smaller than the motor impact current 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:
in one embodiment, the motor impact current obtaining unit is used for performing variable-frequency switching on the escalator according to related parameters and obtaining the motor impact current of the escalator motor in the variable-frequency switching process; the related parameters comprise a switching compensation angle corresponding to the current adjustment;
the motor impact current comparison unit is used for comparing the motor impact current with the motor impact current obtained according to the previous adjustment of the corresponding switching compensation angle when the motor impact current is larger than the motor impact current 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 motor impact current 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 the adjustment result confirming unit is used for confirming the switching compensation angle corresponding to the motor impact current smaller than the motor impact current threshold as the final switching compensation angle when the motor impact current smaller than the motor impact current threshold is obtained.
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 motor impact current of the escalator in the variable working frequency switching process, and determining an adjustment mode of the switching compensation angle corresponding to the current adjustment according to the comparison result of the motor impact current and the motor impact current 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 motor impact current smaller than the motor impact current threshold value is obtained. Based on the invention, the switching compensation angle is adjusted through the motor impact current, the switching compensation angle corresponding to the motor impact current within the motor impact current threshold range is obtained and is confirmed to be 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 flowchart of an embodiment of a method for adjusting a power frequency switching compensation angle of an escalator;
fig. 2 is a schematic flow chart of a process for acquiring a motor impact current of the escalator in a variable working frequency switching process 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 motor impact current of the escalator motor in the variable frequency switching process; the related parameters comprise a switching compensation angle corresponding to the current adjustment;
specifically, the motor impact current of the escalator motor in the process of work frequency changing switching is the maximum value of the motor output current in the process of work frequency changing switching of the escalator and is a scalar. Generally, when a motor has a large motor impact current, the escalator can also shake to a large extent.
Step S120, when the motor impact current is larger than or equal to the motor impact current threshold, comparing the motor impact current with the motor impact current obtained according to the corresponding switching compensation angle adjusted at the previous time;
specifically, the motor inrush current threshold is a preset value and is a scalar used for judging whether a switching compensation angle of the escalator needs to be adjusted in a power frequency conversion switching process. When the motor impact current is greater than or equal to the motor impact current threshold, the motor impact current obtained according to the relevant parameters including the switching compensation angle corresponding to the current adjustment is too large, which indicates that the jitter amplitude of the corresponding escalator is also large, and the switching compensation angle corresponding to the current adjustment needs to be adjusted.
For example, a motor with the power of 7.5KW and the rated current of 18A is set, the motor impact current threshold is set to be 30A, and when the motor impact current is greater than 30A, the situation that the vibration of the escalator is too large when the escalator is switched at a variable working frequency is judged; when the impact current of the motor is less than 30A, the escalator can stably run when being switched at a variable working frequency.
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 in step S120, a specific adjustment manner corresponding to the currently adjusted switching compensation angle is determined, and the currently adjusted switching compensation angle is adjusted according to the adjustment manner, so as to obtain a switching compensation angle corresponding to the next adjustment. According to the change of the motor impact current in the automatic escalator power frequency switching process twice, the corresponding switching compensation angle can be correspondingly adjusted, so that the motor impact current adjusted again in the next time is smaller.
And step S140, when the motor impact current smaller than the motor impact current threshold is obtained, confirming the switching compensation angle corresponding to the motor impact current smaller than the motor impact current threshold as a final switching compensation angle.
Specifically, when the motor impact current smaller than the motor impact current threshold is obtained, the escalator is indicated to run stably in the variable working frequency switching process, the switching compensation angle corresponding to the motor impact current smaller than the motor impact current threshold is confirmed as the final switching compensation angle, and the adjustment of the variable working frequency switching compensation angle of the escalator is completed.
According to the embodiment of the method for adjusting the variable power frequency switching compensation angle of the escalator, the motor impact current is compared with the motor impact current obtained according to the switching compensation angle corresponding to the previous adjustment, the switching compensation angle corresponding to the current adjustment is correspondingly adjusted according to the comparison result, so that the motor impact current is rapidly converged in a numerical range smaller than the motor impact current threshold, and when the motor impact current smaller than the motor impact current threshold is obtained, the switching compensation angle corresponding to the motor impact current smaller than the motor impact current threshold is confirmed to be the final switching compensation angle 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 motor impact current of the escalator in the first power frequency conversion switching process 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 motor impact current of the escalator in the first time of power frequency conversion switching process is obtained:
and when the motor impact current of the escalator in the first time of power frequency conversion switching is greater than or equal to the motor impact current threshold value, increasing or decreasing the preset switching compensation angle by a preset adjustment angle to obtain a switching compensation angle corresponding to the second time of adjustment.
Specifically, each adjustment process of the switching compensation angle comprises one time of work frequency changing switching of the escalator, and when the adjustment process is carried out for the first time, the work frequency changing switching of the escalator can be correspondingly carried out for the first time. 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.
For example, the escalator is switched for the first time to change the power frequency according to the relevant parameters including the preset switching compensation angle, the motor impact current of the escalator in the first time power frequency switching process is obtained, and when the motor impact current in the first time power frequency switching process is larger than or equal to the motor impact current threshold value, the preset switching compensation angle is increased or decreased by the preset adjustment angle. And taking the adjusted preset switching compensation angle as a switching compensation angle corresponding to the second adjustment, and obtaining the motor impact current in the second time of work frequency conversion switching process of the escalator corresponding to the second adjustment. And finally obtaining a final switching compensation angle which enables the motor impact current to be smaller than the motor impact current threshold value through the 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, the escalator is powered by a frequency converter before the escalator changes to power frequency, so that the frequency of the output voltage of the frequency converter is equal to the frequency of the escalator motor, and the frequency of the output voltage of the frequency converter is acquired by controlling an encoder connected with the escalator motor.
In one embodiment, before the escalator is switched between work frequency and work frequency, the escalator motor is powered by the frequency converter, and the phase of the output voltage of the motor is equal to the phase of the output voltage of the frequency converter. Therefore, the process of obtaining the output voltage phase of the frequency converter comprises the steps of controlling the encoder to collect motor displacement information, collecting motor output current by the motor side current meter, obtaining the mechanical speed of the motor according to the motor displacement information, obtaining the slip angle of the motor 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 obtaining the output voltage phase of the frequency converter through integration.
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 frequency-to-frequency switching on the escalator according to the relevant parameters to obtain the motor inrush current of the escalator during the frequency-to-frequency switching includes:
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, monitoring the motor output current of the escalator motor in the process of work frequency conversion switching, and obtaining the motor impact current of the escalator in the process of work frequency conversion switching according to the motor output current;
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 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 value, a switching command is issued, the frequency conversion operation contactor is controlled to be disconnected, the power frequency operation contactor is closed, the current sensor connected with the output end of the motor is controlled while the switching command is issued, the motor output current of the escalator motor is monitored in real time, after the switching command is issued and the preset switching process duration is passed, the switching is determined to be finished, a plurality of motor output current values in the escalator variable power frequency switching process are obtained, and the largest value in the plurality of motor output current values is determined to be the motor impact current.
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 process duration is preset time, timing is started when a switching instruction is issued, and after the preset switching process duration, the variable power frequency switching of the escalator is determined to be completed.
Preferably, the switching time ranges from 100 milliseconds to 300 milliseconds.
When the escalator is switched with variable working frequency, the switching compensation angle and the output voltage phase of the frequency converter are added to participate in the switching condition whether the escalator can be switched with variable working frequency or not, so that the size of the switching compensation angle can influence the size of the motor impact current in the process of switching the escalator with the variable working frequency.
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 motor impact current is larger than the motor impact current obtained according to the switching compensation angle corresponding to the previous adjustment, adjusting the switching compensation angle corresponding to the current adjustment in an adjustment mode opposite to the previous adjustment;
or
And when the motor impact current is smaller than the motor impact current 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 motor inrush current is greater than the motor inrush current 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 motor impact current is smaller than the motor impact current 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 to reduce the preset adjustment angle, the adjustment mode of the switching compensation angle corresponding to the current adjustment is also to reduce the preset adjustment angle.
The change trend of the motor impact current is obtained according to the motor impact current and the motor impact current obtained by adjusting the corresponding switching compensation angle in the previous time, and the corresponding adjustment is carried out on the switching compensation angle corresponding to the current adjustment, so that the motor impact current can be converged into a numerical range smaller than the motor impact current threshold value more quickly, the adjustment efficiency of the switching compensation angle is further improved, and the adjustment time length is reduced.
In a specific embodiment, the preset adjustment angle ranges from 1 degree to 20 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 adjustment angle is 3 degrees. The preset switching compensation angle is 80 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 variable power frequency switching of the escalator according to relevant parameters including a preset switching compensation angle (80 degrees) to obtain motor impact current of the first variable power frequency switching of the escalator;
step S320, adjusting a switching compensation angle corresponding to the first adjustment, namely a preset switching compensation angle (80 degrees), and increasing the preset switching compensation angle (80 degrees) by a preset adjustment angle (3 degrees) to obtain a switching compensation angle (83 degrees) corresponding to the second adjustment;
step S330, performing second-time power frequency conversion switching of the escalator according to related parameters including a second-time adjustment corresponding switching compensation angle (83 degrees) to obtain motor impact current of the second-time power frequency conversion switching of the escalator;
step S340, the impact current of the motor switched by the escalator from the second time of power frequency conversion is larger than the impact current of the motor switched by the escalator from the first time of power frequency conversion, the adjustment mode of the switching compensation angle (83 degrees) corresponding to the second time of adjustment is opposite to the adjustment mode of the first time of adjustment, the switching compensation angle (83 degrees) corresponding to the second time of adjustment is reduced by a preset adjustment angle (3 degrees), and the switching compensation angle (80 degrees) corresponding to the third time of adjustment is obtained;
step S350, carrying out third-time power frequency conversion switching on the escalator according to relevant parameters including a third-time adjustment corresponding switching compensation angle (80 degrees), and obtaining motor impact current for the third-time power frequency conversion switching on the escalator;
step S360, the impact current of the motor switched by the escalator from the third time of changing into the power frequency is smaller than the impact current of the motor switched by the escalator from the second time of changing into the power frequency, the adjustment mode of the switching compensation angle (80 degrees) corresponding to the third time of adjustment is the same as the adjustment mode of the second time of adjustment, the switching compensation angle (80 degrees) corresponding to the third time of adjustment is reduced by a preset adjustment angle (3 degrees), and the switching compensation angle (77 degrees) corresponding to the fourth time of adjustment is obtained;
step S370, performing fourth time of power frequency conversion switching of the escalator according to related parameters including a fourth time adjustment corresponding switching compensation angle (77 degrees), and obtaining a motor impact current of the fourth time of power frequency conversion switching of the escalator;
and S380, determining that the switching compensation angle (77 degrees) corresponding to the fourth adjustment is the final switching compensation angle when the motor impact current of the escalator for the fourth time of power frequency switching is smaller than the motor impact current threshold, and finishing the adjustment of the switching compensation angle for the escalator for power frequency switching.
The final switching compensation angle (77 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 (77 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.
The motor impact current in the process of changing the working frequency of the escalator can be monitored in real time, the shaking condition of the escalator for changing the working frequency switching is monitored through the value of the motor impact current, and whether the escalator is abnormal or not is judged.
In a specific embodiment, the obtaining of the final switching compensation angle may be further obtained by:
taking 15 degrees as an interval, obtaining 24 switching compensation angles from 0 degree to 360 degrees;
respectively carrying out the power frequency switching of the escalator through the compensation angles to obtain the corresponding motor impact currents of 24 escalator power frequency switching processes;
and comparing to obtain the minimum motor impact current, and determining the switching compensation angle corresponding to the minimum motor impact current 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 motor impact current obtaining unit 410 is used for performing variable frequency switching on the escalator according to relevant parameters, and obtaining motor impact current of the escalator motor in the variable frequency switching process; the related parameters comprise a switching compensation angle corresponding to the current adjustment;
a motor impact current comparing unit 420, configured to compare the motor impact current with a motor impact current obtained according to a previous adjustment of the corresponding switching compensation angle when the motor impact current is greater than the motor impact current threshold;
an adjusting unit 430, configured to determine, according to the comparison result of the motor inrush current comparing unit 420, an adjusting manner for adjusting the currently adjusted corresponding switching compensation angle, so as 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 440, configured to confirm the switching compensation angle corresponding to the motor inrush current smaller than the motor inrush current threshold as the final switching compensation angle when the motor inrush current smaller than the motor inrush current threshold is obtained.
The escalator power frequency changing switching compensation angle adjusting system realizes the current adjustment of the switching compensation angle by comparing the motor impact current in the previous escalator power frequency changing switching process with the motor impact current in the current escalator power frequency changing switching process, and the motor impact current in the escalator power frequency changing switching process is obtained by the motor impact current obtaining unit 410; the motor inrush current comparing unit 420 compares the motor inrush current with the motor inrush current obtained according to the previous adjustment of the corresponding switching compensation angle; in the adjusting unit 430, according to the comparison result of the motor impact current 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 adjustment result confirming unit 440 obtains the switching compensation angle corresponding to the motor impact current smaller than the motor impact current threshold, so as to determine the final switching compensation angle and complete the adjustment of the switching compensation angle. The efficiency of obtaining the final switching compensation angle is improved, and the time required by adjustment is greatly shortened
In one embodiment, the motor inrush current 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 first power frequency conversion switching on the escalator according to related parameters to obtain the motor inrush current of the escalator in the first power frequency conversion switching process;
the adjusting unit 430 is further configured to increase or decrease the preset adjusting angle to the preset switching compensation angle when the motor impact current of the escalator in the first power frequency conversion switching process is greater than the motor impact current threshold, so as to obtain a switching compensation angle corresponding to the second 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 is realized, so that the switching compensation angle can be continuously adjusted by detecting the motor impact current of the motor of the escalator, the switching compensation angle corresponding to the motor impact current within the motor impact current 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 shortened.
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 flow of the embodiment of the method for adjusting the power frequency switching compensation angle of the escalator through detecting the motor impact current of the motor of the escalator, thereby continuously adjusting the switching compensation angle, finally obtaining the switching compensation angle corresponding to the motor impact current within the motor impact current threshold range and confirming the switching compensation angle as the final switching compensation angle, effectively improving the adjustment efficiency of the final switching compensation angle and reducing the time required by adjustment.
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)
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