A phase synchronous switching method for frequency conversion switching of escalator workers and frequency conversion switching system of escalator workers
A technology of industrial frequency switching and phase synchronization, which is applied in the field of escalator control, can solve problems such as phase out of synchronization, and achieve the effect of avoiding current shock and shaking
Active Publication Date: 2017-03-29
HANGZHOU OPTIMAX TECH
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Problems solved by technology
However, the existing synchronization process is mostly implemented when the frequency conversion is switched to the industrial frequency, and when the switching is completed, the phase synchronization monitoring is no longer performed, resulting in the phenomenon that the phase is not synchronized when switching from the industrial frequency to the variable frequency.
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[0058] The present invention will be described in detail below with reference to the drawings and specific embodiments.
[0059] The phase synchronous switching method and the escalator industrial frequency switching switching system for the escalator industrial frequency switching of the present invention, in order to ensure that the industrial frequency switching is completed within a specified time, the scheme has the following requirements for the power grid:
[0060] Referring to the national standard GBT12325-2008 (voltage deviation) and national standard GBT15945-2008 (power system frequency deviation), the frequency fluctuation deviation of the grid voltage (for the grid with a frequency of 50Hz and 60Hz) is ±0.5Hz, and the fluctuation range of the voltage amplitude is ±7%. The grid voltage can be switched normally only when the above conditions are met, otherwise it may cause synchronization timeout or failure to complete synchronization.
[0061] The escalator worke...
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The invention discloses a phase synchronization switching method for switching power frequency and variable frequency of an escalator and a system for switching power frequency and variable frequency of the escalator. The system for switching power frequency and variable frequency of the escalator provided by the invention is provided with a phase difference detection circuit and a power frequency detection circuit, a phase difference between a variable frequency current and a power frequency current is detected by the phase difference detection circuit, the frequency of the power frequency current is detected by the power frequency detection circuit, and the frequency of the variable frequency current is stabilized to be in a power frequency. When variable frequency current electric drive is switched into power frequency electric drive, the frequency of the variable frequency is adjusted to be in the power frequency, and then phase position regulation is carried out, therefore, the phase difference between the variable frequency current and the power frequency current is stabilized to be a specific value and then is switched. Under the condition that the phase difference between the variable frequency current and the power frequency current is an any value, the synchronous adjustment of the phase and frequency can be finished during 2s, and non-current impact switch from the variable frequency electric drive to the power frequency electric drive can be realized.
Description
technical field [0001] The invention relates to the field of escalator control, in particular to a phase synchronous switching method for frequency conversion switching of escalator workers and a frequency conversion switching system for escalator workers. Background technique [0002] With the continuous development of society, escalators have been used more and more widely. The drives of escalators mainly include: power frequency drive, variable frequency drive and bypass drive. [0003] The industrial frequency drive method has the simplest system structure and the most stable use, but the existing problems are that it does not save energy and cannot adjust the speed; the advantage of the full variable frequency drive is that it can adjust the speed in a wide range and has better comfort, but the system cost is relatively high. Energy feedback cannot be performed, and a large amount of energy is lost in the form of heat during downlink; the bypass drive mode combines the ...
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IPC IPC(8): G05B11/42
Inventor 黄其福王利华蔡卓帆
Owner HANGZHOU OPTIMAX TECH