Single-stage single-phase voltage converter with cascade magnetic integrated switch inductance-capacitance network

Abstract

Provided is a single-stage single-phase voltage converter circuit structure with a cascade magnetic integrated switch inductance-capacitance network. The single-stage single-phase voltage converter circuit structure with the cascade magnetic integrated switch inductance-capacitance network is composed of an input direct current power source or single-phase alternating current power source, the magnetic integrated switch inductance-capacitance network, a high frequency combination modulation switch, a filter and a single-phase alternating current load or direct current load which are in cascadeconnection in sequence; the magnetic integrated switch inductance-capacitance network is composed of three energy-storage inductors and two identical SLCC-type two-port switch inductance-capacitancenetwork units, wherein the SLCC-type two-port switch inductance-capacitance network units are in cascade connection in sequence, and the energy-storage inductors and the SLCC-type two-port switch inductance-capacitance network units are connected in series; magnetic integrated structures of the energy-storage inductors are a three-inductor magnetic coupling structure, a three-inductor magnetic decoupling structure, and a magnetic coupling structure of one inductor with the other two inductors, and an EE-type magnetic core, a four-column magnetic core and an EE-type magnetic core are adopted respectively. The single-stage single-phase voltage converter circuit structure with the cascade magnetic integrated 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 single-phase sine alternating current or a direct current in a single stage, and is applicable tomiddle and small-capacity electrical energy conversion sites.

Description

technical field [0001] The invention relates to a single-stage single-phase voltage-type converter with a cascaded magnetic integrated 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 alternating current or direct current, for use with alternating current loads (including grid-connected power generation with an alternating current grid) or direct current loads. [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, a...

AI Technical Summary

Problems solved by technology

When this type of inverter works normally, the DC side voltage must be greater than the peak value of the AC side phase voltage, so there is an obvious defect: when the DC side voltage (such as the output capacity of photovoltaic cells) decreases, such as rainy days or nights, the entire power generation The system will be difficult to run normally, and the utilization rate of the system will drop

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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