A Control Method of Two-phase Orthogonal Inverter Power Supply with Delay Compensation Function

Abstract

The present invention discloses a two-phase orthogonal inversion power source control method enabling a delay compensation function. According to the method, an iterative learning algorithm is added to the feedback control link of current; the quick compensation output of the current can be realized through repeatedly applying information obtained in previous experiments, and therefore, the response performance of the output alternating current of a PWM inverter can be improved, and control quality can be also improved; as for a condition that the delay of a control system influences output current dynamic tracking performance and the stability of a system, a Smith predictor is introduced to eliminate the delay influence of the control system; and in fact, the Smith predictor estimates a lag link and makes appropriate compensation, so that a closed-loop characteristic equation does not contain the lag link, thus the dynamic characteristic and stability of the system can be improved. The control method of the present invention can significantly improve the stability and response speed of a system as for electromagnetic stirring which requires frequent positive and negative rotation alternation.

Description

technical field [0001] The invention relates to the technical field of a two-phase orthogonal inverter power supply for electromagnetic stirring, in particular to a control method for a two-phase orthogonal inverter power supply with a delay compensation function. Background technique [0002] Electromagnetic stirring technology was first invented by Sweden ASEA company, used in electric arc furnace steelmaking, and later used in continuous casting. Electromagnetic stirring technology is an important auxiliary means to improve the efficiency of metal smelting process and product quality. It has been increasingly mature since it was applied to continuous casting of steel. It is not only used in tundish heating, solidification end, crystallizer and secondary cooling zone, but also in It is applied to alloy melting furnaces and has developed from a single form to a combined form. Since the electromagnetic stirring technology has a significant effect on improving the surface an...

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Problems solved by technology

[0003] However, the output current of the two-phase orthogonal power supply used for electromagnetic stirring is variable, and it needs to be alternated frequently. Therefore, the delay in the power system causes the poor dynamic tracking performance of the output current, which will affect the electromagnetic stirring system. have a certain impact on the stability of

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