Control method of high-voltage cascade energy feedback converter power module

Abstract

The invention discloses a control method of a high-voltage cascade energy feedback converter power module. Network-side voltage is oriented by a software phase-locked ring. The network-side voltage is subjected to positive and negative sequence component separation before calculation of the software phase-locked ring so that positive sequence component in the network-side voltage is extracted. The positive sequence component is used as an input single of the software phase-locked ring to allow for phase tracking for the network-side voltage positive sequence component. A three-phase inverter mathematical model with positive and negative sequence independent control in a rotating coordinate system is used on the grid-connection side, so that normal operation of the system is guaranteed in case of grid distortion. A double closed-loop vector control system with a voltage outer loop and a current inner loop is used, the voltage outer loop is used for controlling DC-side voltage of the power module and provides current command signals to the current ring loop, and fast response of the system can be achieved.

Description

technical field [0001] The invention belongs to the field of energy-saving and environment-friendly power electronics, and in particular relates to a control method for a high-voltage cascaded energy feedback frequency converter with energy bidirectional flow. Background technique [0002] With the development of power electronic devices, modern control theory, and computer technology, the control performance of AC motor frequency conversion speed regulation technology has been greatly improved. Frequency conversion speed regulation has become the trend of contemporary AC motor speed regulation, and has been widely used in various fields of industrial control. Wide range of applications. However, the general-purpose inverters currently used have problems such as large grid-side current harmonic pollution, irreversible energy, and large DC-side capacitors that are easily damaged. [0003] However, most of the frequency converters targeted at the research on PWM rectifier con...

AI Technical Summary

Problems solved by technology

However, the general-purpose inverters currently used have problems such as large grid-side current harmonic pollution, irreversible energy, and large DC-side capacitors, which are easily damaged.

[0003] However, most of the frequency converters targeted at the research on PWM rectifier control strategy in unbalanced state of the power grid are set under the condition of the power grid. There will be abnormal operating conditions, such as the increase of the harmonic amplitude of the DC side voltage and the grid side current of the PWM rectifier, the imbalance of the grid side current, etc., and may even damage the frequency conversion equipment in severe cases.

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