Single-stage current-type converter with cascade multilevel switch inductance-capacitance network

Abstract

Provided is a single-stage current-type converter circuit structure with a cascade multilevel switch inductance-capacitance network. The single-stage current-type converter circuit structure is composed of an input direct current power source or single-phase alternating current power source, the multilevel switch inductance-capacitance network, a high frequency combination modulation switch, a capacitor filter and a single-phase alternating current load or direct current load which are in cascade connection in sequence; the multilevel switch inductance-capacitance network is composed of energy-storage inductors and n identical SLCS-type two-port switch inductance-capacitance network units, wherein the SLCS-type two-port switch inductance-capacitance network units are in cascade connectionin sequence, the energy-storage inductors and the SLCS-type two-port switch inductance-capacitance network units are connected in series, and n is a natural number bigger than 1; each SLCC-type two-port switch inductance-capacitance network unit is composed of two power diodes or two four-quadrant power switches, one energy-storage inductor and one energy-storage capacitor; the high frequency combination modulation switch is composed of a power diode, two-quadrant power switches or four-quadrant power switches. The single-stage current-type converter circuit structure with the cascade multilevel switch inductance-capacitance network can effectively convert an unstable wide-change-range low-voltage direct current or a single-phase alternating current into a stable and high-quality direct current or a single-phase sine alternating current in a single stage.

Description

technical field [0001] The invention relates to a single-stage current-type converter with a cascaded multi-stage switch inductance network, which belongs to the power electronics technology. Background technique [0002] A converter is a static converter device that uses power semiconductor devices to convert direct current or alternating current into direct current or alternating current for use with direct current loads or alternating current loads (including grid-connected power generation with an alternating current grid). [0003] Due to the increasing shortage of fossil energy (non-renewable energy) such as oil, coal and natural gas, serious environmental pollution, global warming, nuclear waste and environmental pollution caused by nuclear energy production, energy and the environment have become major issues facing mankind in the 21st century. . Renewable energy (green energy) such as solar energy, wind energy, hydrogen energy, tidal energy, and geothermal energy h...

AI Technical Summary

Problems solved by technology

This is to effectively overcome the shortcomings of traditional PWM converters such as the dead time of the bridge arm, the boost ratio is not large enough (non-isolated), the volume and weight of the system, and the high cost (input or output plus single-phase power frequency transformer) and other defects. , improve the output waveform quality and reliability of the conversion system and reduce the EMI on the input side, broaden the theory of power electronics conversion technology and renewable energy power generation technology, promote the development of new energy power generation industry and develop an energy-saving and conservation-oriented society. significance

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