Quasi-Z source inverter

Abstract

The invention discloses a quasi-Z source inverter, which comprises a voltage boosting network, a quasi-Z source circuit and a full bridge inverter which are in sequential connection, wherein the voltage boosting network comprises a first diode, a third inductor, a second diode and a third capacitor, the quasi-Z source circuit comprises a first inductor, a second inductor, a first capacitor, a second capacitor and a third diode, the first diode is connected in series between the second inductor and the third inductor, the second diode is connected in parallel between the two ends of the third inductor and the first diode, the third capacitor is connected in parallel at the two ends of the first diode and the second inductor, the third diode is connected between the first inductor and the second inductor, the first capacitor is connected in parallel at the two ends of the third diode and the first inductor, the second capacitor is connected between the negative electrode of a direct current source and the first inductor, and the positive electrode of the direct current voltage source is connected with the inverter. The quasi-Z source inverter has the advantages that the voltage boosting is high and stable, the size is small, the efficiency is high, the capacitor voltage stress is low, and the like.

Description

technical field [0001] The invention belongs to the field of inverters and relates to a quasi-z source inverter. Background technique [0002] With the increasingly serious energy crisis and the deterioration of the earth's ecological environment, the whole world is trying to find a new type of energy that can be used continuously and does not pollute our ecological environment. New energy such as photovoltaic solar energy has become a competition among countries. The commanding heights of science and technology, and the inverter technology is the core technology of the whole system. With the rapid development of DSP technology and high-power, high-frequency switching devices and the continuous reduction of cost, the high-power, low-cost, and high-efficiency inverters are constantly being developed, and they are applied to all aspects of industry, military, and civilian use. Therefore, the development of new, high energy efficiency, safe and stable inverters plays a very im...

AI Technical Summary

Problems solved by technology

[0003] At present, the research on the inverter is mainly focused on how to improve its topology and control strategy. In order to increase the reliability of its work, most of them add snubber circuits to the inverter, but this not only increases the loss of the entire system, It also reduces the efficiency of the inverter

In addition, the traditional inverter cannot realize the buck-boost and inversion of the DC power supply in a single stage. It needs to increase the DC-DC link in the front stage, which makes the control of the system complicated and inefficient. no advantage

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