Large-power high-frequency switch eliminator power comprehensive control method

Abstract

The invention discloses a large-power high-frequency switch eliminator power comprehensive control method which includes a front-stage three-phase voltage type rectifier control method and a back-stage high-frequency direct current / direct current (DC / DC) convertor control method. A parameter self-adaptation control dead beat control method based on power front feed is adopted in a front-stage three-phase voltage type rectifier, and quick response of a system and quick track of load change are achieved; and through parameter self-adaptation control, on-line dead beat controller parameter correction can be achieved, matching of control parameters and actual parameters can be achieved, bad influence on control performance because of parameter perturbation or drifting can be eliminated, and control robustness can be improved. A virtual impedance self-current-sharing control method based on output voltage feedback is adopted in a back-stage high-frequency DC / DC convertor, conflict between current-sharing control accuracy and load output voltage accuracy can be effectively solved, virtual impedance dereference can not influence output adjustment of load voltage, and adaptation capacity of the virtual impedance current-sharing method on occasions where accuracy demands on the output voltage are high is improved.

Description

technical field [0001] The invention relates to a high-power high-frequency switch rectifier power supply, in particular to a control method for a high-power high-frequency switch rectifier power supply. Background technique [0002] In the large-scale electrolytic plating industry, high-frequency switching power supply is one of the core equipment. The traditional electroplating electrolytic DC power supply mainly adopts power frequency rectification, uncontrollable rectification, and thyristor controllable rectification technology. Safe and stable operation of the power grid. The high-frequency switching rectifier power supply is gradually replacing the traditional electroplating electrolytic DC power supply due to its high power factor, low harmonic content, and small size. [0003] The pre-stage three-phase voltage rectifier mainly realizes PWM rectification control, and adopts voltage and current double closed-loop control method. In order to simplify system control ...

AI Technical Summary

Problems solved by technology

This method is simple and easy, and does not require interconnection wires, but there is a contradiction between the accuracy of the current sharing control and the accuracy of the load output voltage. The larger the value of the virtual impedance, the better the current sharing effect, but the greater the voltage drop on the virtual impedance. Affects the voltage regulation of the switching power supply, so it is not suitable for occasions that require high output voltage accuracy

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