A reactor-less control method for high-voltage inverter switching from power frequency to variable frequency
A high-voltage frequency converter and control method technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of high equipment cost, slow switching speed, complex composition of power electronic devices, etc., achieve simple control and save equipment space and cost effects
Active Publication Date: 2021-11-30
中冶赛迪电气技术有限公司
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Problems solved by technology
However, the composition of its power electronic devices is complex and requires regular maintenance or unscheduled maintenance. Therefore, it is necessary to switch between the power frequency side and the frequency converter from time to time. Reliable bumpless switching technology
[0003] At present, there are many methods of power frequency non-disturbance switching, and the hot switching method is commonly used. This method requires the synchronous process of the frequency converter and the power frequency, and needs to install an output reactor. The control is complicated and the equipment cost is high; in order to avoid synchronous The difficulty of control reduces the cost of the reactor. For the control method of switching from frequency conversion to power frequency, there are many mature methods, which are not involved in the present invention; for the control method of switching from power frequency to After the inverter is turned on, the inverter performs flying start. This method usually has a slow switching speed and may easily cause large load disturbances.
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[0029] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.
[0030] see Figure 1 ~ Figure 2 , figure 1 It is the control system for high-voltage frequency converter switching from power frequency to frequency convers...
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The invention relates to a reactor-less control method for switching a high-voltage frequency converter from a power frequency to a frequency conversion, and belongs to the field of power electronics. The method is to use the voltage detection module to detect the voltage signal of the motor stator, and perform phase-locking calculation on it to obtain the voltage amplitude and angle of the motor stator side. The control mode of the inverter; the frequency converter adjusts the initial phase angle of the fundamental wave of the three-phase output and the initial phase angle, amplitude and modulation degree of the superimposed third harmonic according to the detected amplitude of the stator voltage of the motor, so as to realize the control of the output current without impact. The invention can realize smooth and undisturbed switching under the condition of no output reactor, and reduce equipment cost; it does not need the synchronous operation control of the frequency converter and the industrial frequency power supply, and realizes fast switching.
Description
technical field [0001] The invention belongs to the field of power electronics, and relates to a reactor-free control method for switching from power frequency to variable frequency of a high-voltage frequency converter, which is suitable for a frequency converter control system similar to driving an AC rotating motor. Background technique [0002] The high-voltage inverter adopts the method of multi-level series voltage doubling, and has the perfect output of high-quality variable frequency variable voltage (VVVF) sinusoidal voltage and sinusoidal current. However, the composition of its power electronic devices is complex and requires regular maintenance or unscheduled maintenance. Therefore, it is necessary to switch between the power frequency side and the frequency converter from time to time. Reliable bumpless switching technology. [0003] At present, there are many methods of power frequency non-disturbance switching, and the hot switching method is commonly used. T...
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IPC IPC(8): H02P27/00H02P27/04H02P27/02
CPCH02P27/00H02P27/02H02P27/04
Inventor 勾立争杨美霞郝亚川干永革姜廷阳傅永伟
Owner 中冶赛迪电气技术有限公司