Control device and control method of modular multi-level high-voltage frequency converter

Abstract

The invention relates to a control device and control method of a modular multi-level high-voltage frequency converter. According to the invention, a hierarchical control mode suitable for the modular multi-level high-voltage frequency converter is provided according to the special structure of the modular multi-level high-voltage frequency converter. The control device includes a monitoring layer, a control layer and a field layer; the monitoring layer includes a specific control upper computer designed through adopting LabVIEW; the control layer adopts an OMAP-L137 and an FPGA with powerful processing and computation functions; and the field layer includes a plurality of data acquisition boards and a plurality of sub control boards. Separate control modes are adopted for the rectification side and inversion side of the modular multi-level high-voltage frequency converter; and the quantity of DSP data acquisition interface resources and PWM output interface resources fully satisfies the control requirements of the modular multi-level high-voltage frequency converter.

Description

technical field [0001] The invention relates to the field of power electronics and automatic control, in particular to a control device and a control method of a modular multilevel high-voltage frequency converter. Background technique [0002] High-voltage frequency converters are widely used in large-capacity high-voltage transmission equipment. For example, high-voltage frequency converters are used as frequency conversion and speed regulation equipment for high-power fans and motors, and are mainly used in industries such as electric power, metallurgy, mining, and municipal services that use more high-power motors. High-voltage motors can use high-voltage frequency converters to realize stepless speed regulation, meet the control requirements for motor speed regulation in the production process, improve product quality and output, and achieve the purpose of greatly saving energy and reducing consumption, thereby reducing energy costs to the greatest extent and improving ...

AI Technical Summary

Problems solved by technology

[0009] For the control of high-voltage inverters, in the traditional control mode, the data acquisition of voltage and current and the generation of PWM waves are mainly completed by the control chip DSP. The DSP designed in this way not only needs to complete the task of data acquisition, but also implements control algorithms and generates PWM waves. , the task of DSP is heavy. Although the title is "Design and Application of Unit Series High-Voltage Frequency Converter" and the author is Xu Meng, the main controller structure of dual DSP is proposed, but the DSP data acquisition interface resources and PWM output interface resources The quantity is far from meeting the control requirements of modular multi-level high-voltage inverters. If this traditional design scheme is transplanted into the control of modular multi-level high-voltage inverters, it will not be competent for modular multi-level high-voltage inverters. control work

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