A Nonlinear Compensation Method for Inverter
A non-linear compensation and inverter technology, applied in the direction of converting irreversible DC power input to AC power output, output power conversion device, AC power input conversion to DC power output, etc., can solve current error-prone, system Poor stability, current waveform and voltage waveform distortion, etc., to achieve the effect of ensuring ease of operation, improving output stability, and improving accuracy
Active Publication Date: 2017-09-12
SHANGHAI STEP ELECTRIC +1
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Problems solved by technology
Near the zero-crossing point of the current, the judgment of the polarity of the current is easy to be wrong, which causes the polarity of the compensation value to be wrong, and the current waveform and voltage waveform are seriously distorted.
Especially in the speed sensorless vector control system, the system stability becomes worse at low speed
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[0034] In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.
[0035] The first embodiment of the present invention relates to a nonlinear compensation method of an inverter. The block diagram of the inverter nonlinear time identification system based on the nonlinear compensation method is as follows figure 2 As shown, the flow chart of this embodiment is as follows image 3 shown. ...
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The invention relates to the field of power electronics, and discloses a nonlinear compensation method for an inverter. The nonlinear compensation method comprises the following steps that the nonlinear compensation time of the inverter is identified along with the magnitude variation of currents, and an identified result is stored, wherein the nonlinear compensation time periods and the current magnitudes are in one-to-one correspondence; nonlinear compensation is conducted on the inverter according to the identified result. Compared with the prior art, the output stability and accuracy of the inverter are improved. Moreover, only the software part in the system is modified in the method, so that extra hardware equipment is of no need, and the cost is saved while the system performance is improved.
Description
technical field [0001] The invention relates to the field of power electronics, in particular to a nonlinear compensation method for an inverter. Background technique [0002] An inverter is a transformer that converts direct current to alternating current. In the following, bridge arm A is used as an example to illustrate. In the voltage source inverter control system, in order to prevent the two switching tubes VT1 and VT2 of the same bridge arm of the inverter from being in the conduction state at the same time and short circuit occurs, the two switches must Add dead time between tube turn-on signals, such as figure 1 Shown, where, M represents the motor. When the switching tubes VT1 and VT2 need a period of time to turn on and off, they are not completely synchronized with the control signal, that is, there is a turn-on delay time and a turn-off delay time between the switch tube and the control signal. [0003] In addition, when the switch tubes VT1 and VT2 are turne...
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IPC IPC(8): H02M7/48H02P27/08
CPCH02M7/53871H02P27/08
Inventor 付凤超陈伟金辛海严彩忠蔡亮
Owner SHANGHAI STEP ELECTRIC