Tap inductor-type Z source inverter

Abstract

The invention discloses a tap inductor-type Z source inverter, which comprises a DC power supply Udc, a three-phase inverter and an inductor tap Z source network, wherein the output end of the DC power supply Udc is connected with the input end of the inductor tap Z source network; the output end of the inductor tap Z source network is connected with the input end of the three-phase inverter; the output end of the three-phase inverter is connected with a power grid or a load; the inductor tap Z source network comprises a tap inductor Lt, a diode Din, a diode D1, a diode D2, a capacitor C1, a capacitor C2 and an inductor L3; and the tap inductor Lt comprises a winding N1 and a winding N2. The tap inductor-type Z source inverter can be used in situations of power generation and grid connection of new energy sources and motor drive and has the advantages of high step-up ratio, small capacitance voltage stress, high DC voltage utilization rate, small start impact and the like.

Description

technical field [0001] The invention relates to a tapped inductance type Z-source inverter, which belongs to the technical field of inverter circuits. Background technique [0002] Traditional inverter circuits are divided into two types: voltage source and current source. However, these two types of inverters have the following common shortcomings. They are either step-up or step-down converters, rather than boost / Step-down converters; and their ability to resist electromagnetic interference is poor, and when the bridge arm is short-circuited or open-circuited due to electromagnetic interference, it is easy to cause damage to the converter. Therefore, in 2002, Professor Peng Fangzheng of Michigan State University in the United States proposed a new type of inverter, which is a Z-source inverter. Z-source inverter provides a new idea and theory, which can overcome the deficiencies of traditional voltage source and current source inverters. [0003] Since the Z-source inve...

AI Technical Summary

Problems solved by technology

However, there are still many defects in the existing Z-source topology: 1. The boosting capability is limited. To improve the boosting capability, it is necessary to increase the direct duty cycle, which will inevitably reduce the modulation ratio, which will increase the stress on the power device; 2. . The input current is intermittent, and the DC voltage utilization rate is low; 3. There is a start-up shock circuit, which affects the performance of the inverter

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