Single-stage single-phase voltage-source converter with cascaded magnetically integrated switch-capacitance network

Abstract

A single-stage single-phase voltage-type converter circuit structure with a cascaded magnetic integrated switch inductive network, which is composed of an input DC power supply or a single-phase AC power supply, a magnetic integrated switch inductive network, a high frequency combined modulation switch, a filter, Single-phase AC loads or DC loads are cascaded in sequence; the magnetic integrated switch inductive network is composed of energy storage inductors and two identical SLCC type two-port switch inductive network units cascaded in series. The magnetic integration structure of the energy inductance is three inductance magnetic coupling, three inductance magnetic decoupling, one inductance and the other two inductance magnetic coupling structures respectively, using EE type magnetic core, four column type magnetic core and EE type magnetic core respectively. This kind of converter can convert unstable wide-range low-voltage direct current or single-phase alternating current into stable and high-quality single-phase sinusoidal alternating current or direct current with high efficiency, and is suitable for small and medium-capacity power conversion occasions.

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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