PWM rectifier fuzzy sliding mode variable structure control method when three-phase network voltage is unbalanced
A sliding mode variable structure, voltage unbalanced technology, applied in the field of rectifiers and voltage source PWM rectifiers, can solve the problems of restricting sliding mode variable structure control, difficult to meet requirements, poor anti-interference ability, etc. The effect of stickiness and response speed, stable operation
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[0030] Below in conjunction with accompanying drawing, table and implementation example, the present invention is further elaborated.
[0031] The working principle of the method of the present invention is:
[0032] (1) Sampling the DC side voltage of the voltage-type PWM rectifier VSR, and obtaining the rated active power through the PI controller
[0033] (2) Sampling the three-phase grid voltage and the AC side current of the VSR, and obtain e after Park transformation d 、e q i d i q . Then decompose it into positive and negative sequences to get In order to realize the unit power factor operation of the rectifier and eliminate the second harmonic fluctuation on the DC side, the detected voltage and power are written into the power matrix, and the generalized inverse matrix calculation is performed to obtain the rated current
[0034] (3) The current inner loop adopts fuzzy sliding mode variable structure control. The rated current in step (1) passes through th...
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