Intelligent power unit for high-power converter device and control method

Abstract

The invention relates to an intelligent power unit for a high-power converter device and a control method, used for a high-voltage frequency converter and a photovoltaic inverter. The frequency converter is formed by a plurality of power units, each phase of which is arranged in multiple layers, in series; each power unit is provided with a unit field programmable logic array FPGA and a single chip microcomputer unit STM32; the unit field programmable logic array FPGA and the single chip microcomputer unit STM32 are connected through a serial interface SPI; bus over-voltage detection, temperature measurement, bridge arm open-circuit and short-circuit state detection having flash lamp indication, pulse wide measurement and the like are connected to the inlet of the FPGA; the outlet is connected to a driving circuit; a main control system comprises a central data controller and a layer controller on the same mainboard; bidirectional transmission between the main control system and the FPGA is realized through two optical fibres; the two have communication state detection; transmission is carried out according to a specified time sequence; therefore, the anti-interference performance is high; the real-time performance of fault response is ensured; dead-time compensation in pulse width measurement is carried out according to the real waveform; the compensation precision is the highest; a variable-frequency motor is constant in waveform and steady in torque; a test result shows that: the communication speed is high; the synchronization performance is good; the reliability is high; performances are comprehensively optimized and intelligentized; the cost is low; and the intelligent power unit is used for the driving power supply of the variable-frequency motor and the power supply of the photovoltaic inverter.

Description

[0001] (1) Technical field: The current conversion device involved in the present invention mainly includes a high-voltage frequency converter and an optical inverter. High-voltage frequency converters are generally used as drive power for large-scale high-voltage variable-frequency motors, such as drive power for high-voltage large fans in thermal power plants, smelters, and cement plants. The Guangyou inverter is used as the power supply. It belongs to the transformation class between AC and DC (H02M). (2) Background technology [0002] The high-voltage frequency converter is used as a frequency-modulated drive power supply for high-voltage variable-frequency motors. It is a high-power and high-voltage device. Its structure is shown in figure 1 , figure 2 . See figure 1 , the three-phase AC mains 1n obtains phase-shifted three-phase AC 1 through a phase-shifting transformer, which is input to each power unit of each phase, and multiple power units of each phase are conn...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the intelligent power unit and control method of the high-power converter device provided by the present invention is to solve the problem of insufficient fault detection and processing capabilities and low dead zone compensation accuracy of existing high-voltage frequency converters and optical inverters; at the same time, it is necessary to ensure information transmission High reliability and synchronous control; low product cost is required while fully optimizing the performance and intelligentization

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