Method for designing parameters of parameter self-tuning fuzzy PI (proportion integration) in PWM (pulse width modulation) rectifiers
A technology of parameter design and rectifier, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem that it is difficult to show the superiority of the fuzzy PI controller, and achieve the effect of avoiding blindness
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[0023] The present invention proposes a fuzzy controller parameter design method for the previously studied parameter self-tuning fuzzy PI controller of the voltage outer loop, so as to achieve the purpose of optimizing the dynamic performance of the DC side output of the PWM rectifier. Starting from the control structure of the PWM rectifier, the specific steps of this method are as follows:
[0024] a, three-phase PWM rectifier topology such as figure 1 Shown by its figure 2 Shows the dq decoupling control block diagram, get image 3 The shown voltage outer loop simplifies the control block diagram. The voltage regulator is designed according to the classic type II system, and the corrected open-loop transfer function is:
[0025] W ou ( s ) = 0.75 K u ( T u s + 1 ) CT u ( T eu s + 1 ) - - - ( 1 )
[0026] Where K u ,T u Is the voltage outer loop PI regulator parameter; C is the capacitance...
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of PI adjusters and the maximum values K<i_max> of variation of parameters K of the PI adjusters by the aid of curve characters of the simulation results. The method has the advantages that actual parameters K
and K are adjusted in real-time according to fuzzy control principles and deviation e and deviation variation rates ec of the systems, the PI parameters are acquired by the aid of the dynamic performance simulation curve characters of the systems, accordingly, blind selection of the parameters can be prevented, and the systems are short in adjusting time and low in overshoot on the premise that the systems work stably.
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