Single-stage single-phase high-gain step-up three-port integrated inverter

Abstract

The invention relates to a single-stage single-phase high-gain boost type three-port integrated inverter, which belongs to the power electronic conversion technology; the inverter is composed of an energy storage inductor with a center tap, a single-phase inverter bridge and a single-phase The filters are cascaded in sequence, and the drain and source of the energy storage switch are respectively connected to the center tap of the energy storage inductor and the negative terminal of the input DC source, and the two ends of the energy storage inductor with the center tap are connected in parallel. Switch, a battery charge and discharge switch unit is connected between the input DC source, the positive terminal of the battery and the two ends of the energy storage inductance with a center tap; this inverter has three ports of input, output and energy storage, and there is an input The source supplies power to the output load and battery, the input source and battery supplies power to the output load, and the battery supplies power to the load. It can invert the input DC source voltage or single-stage high-gain boost of the battery into a stable and high-quality single-phase sinusoidal AC. .

Description

Technical field: [0001] The invention relates to a single-stage single-phase high-gain boost three-port integrated inverter, which belongs to the power electronic conversion technology. Background technique: [0002] The inverter is a static converter device that uses power semiconductor devices to convert DC power into AC power, which is used by AC loads or connected to the public grid to generate electricity. [0003] Due to the increasing shortage of fossil 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 problems faced by mankind in the 21st century. Renewable energy such as solar energy, wind energy, tidal energy and geothermal energy has the advantages of clean, pollution-free, cheap, reliable and abundant. People pay more and more attention to the development and utilization of renewable energy. quite si...

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 output power of the system is reduced or even stopped, and the utilization rate of the system is reduced, which cannot meet the needs of the load for electric energy, and it is difficult to form an independent power supply system

This is to effectively overcome the defects that the single-stage single-phase step-down inverter cannot be directly applied to the single-phase step-up inverter occasion and the inverter input DC source output capacity cannot meet the load's demand for electric energy, and improve the efficiency of the inverter. Overload and short-circuit capacity and life, reducing electromagnetic interference on the input DC side, broadening the theory of power electronics inverter technology, promoting the development of renewable energy power generation industry, and developing an energy-saving and conservation-oriented society are all of great significance

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