Cascaded multi-level power electronic transformer based on DSP (Digital Signal Processor)/FPGA (Field Programmable Gate Array) cooperative control

Abstract

The invention discloses a cascaded multi-level power electronic transformer based on DSP (Digital Signal Processor) / FPGA (Field Programmable Gate Array) cooperative control, comprising a pre-stage rectification-level circuit, a middle isolation-level circuit, a rear-stage inversion-level circuit and a cooperative control module. Power frequency alternating current is rectified to generate first direct current via the pre-stage rectification-level circuit, the first direct current is modulated via the middle isolation-level circuit to generate high frequency square wave alternating current, the high frequency square wave alternating current is subjected to voltage grade conversion, isolation and demodulation via a high-frequency transformer to generate second direct current, and the second direct current is inverted via the rear-stage inversion-level circuit to output required alternating current. The cooperative module comprises a DSP module and an FPGA module and is used for controlling PWM (Pulse-Width Modulation) waves of the pre-stage rectification-level circuit, the middle isolation-level circuit and the rear-stage inversion-level circuit respectively. The cascaded multi-level power electronic transformer provided by the invention provides enough PWM ports to achieve circuit integration, achieves bidirectional energy flow, reactive compensation, quality control of electric energy and access of renewable energy source and energy storage equipment, is suitable for high-voltage and large-power places, can reduce output harmonic waves without improving the switching frequency, reduces loss and is free of voltage-sharing problems.

Description

technical field

[0001] The invention belongs to the technical field of power electronic transformers, in particular to a cascaded multilevel power electronic transformer based on DSP / FPGA cooperative control. Background technique

[0002] Power electronic transformer (PET), also known as solid-state transformer (SST), or intelligent universal transformer (IUT), is a kind of function that integrates voltage conversion, frequency conversion, dynamic reactive power compensation, power quality control and uninterruptible power supply. intelligent power distribution equipment. With the development of power electronics technology, the research on power electronic transformers has also developed from low-voltage and low-power to high-voltage and high-power, but the technology of high-voltage power devices has become one of the main factors restricting the development of power electronic transformers to high-voltage and high-power, such as high-voltage The voltage level of silicon ...

Images