AAC-based multi-module voltage source type inverter

Abstract

The invention discloses an AAC-based multi-module voltage source type inverter. The AAC-based multi-module voltage source type inverter comprises an LC filter and a full-bridge structure which consists of at least four AAC bridge arms, wherein an H bridge fundamental frequency bridge arm leading-out terminal in an AAC upper bridge arm is connected with a power supply positive electrode output end; an H bridge fundamental frequency bridge arm leading-out terminal in an AAC lower bridge arm is connected with a power supply negative electrode output end; each AAC bridge arm comprises an H bridge unit, a bridge arm electric reactor and a bridge arm conduction switch; each H bridge unit comprises a fundamental frequency bridge arm and a high frequency bridge arm which are connected in parallel; the fundamental frequency bridge arm comprises two series-wound fully-controlled switches with anti-parallel diodes; an emitting electrode of one fully-controlled switch is connected to a collector electrode of the other fully-controlled switch; and the H bridge unit is connected with a voltage-stabilizing capacitor in parallel. The inverter provided by the invention is small in size, and can realize conversion from a low-voltage direct current to a high-voltage alternating current; the system frequency is increased by adopting carrier phase-shifting control; each power switching device suffers from relatively low direct current side voltage; and in addition, the AAC-based multi-module voltage source type inverter is easy to enlarge capacity.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to an AAC-based multi-module voltage source inverter. Background technique [0002] With the increasing speed of social development, human demand for energy continues to increase, and the contradiction between the depletion of fossil energy and the high demand for energy in social development forces people to pay more and more attention to the development and utilization of renewable energy. Wind energy, solar energy, biomass energy, geothermal energy, tidal energy and other renewable new energy power generation technologies of battery energy storage systems have achieved unprecedented rapid development. [0003] Under normal circumstances, the output DC voltage of the new energy power generation system is low. Since the traditional voltage source inverter (VSI) is a step-down inverter, the input voltage of the DC side of the VSI needs to be greater than the output voltage of th...

AI Technical Summary

Problems solved by technology

[0004] 1. The switches all work at high frequency, and the switching loss is large;

[0005] 2. The principle of DC-AC power conversion is always limited by the voltage on the DC side and the AC side;

[0006] 3. The device is not easy to integrate design;

[0008] 5. The large current ripple results in a large filter volume;

[0009] 6. Due to the two-stage structure, the working efficiency of the circuit is not high

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