An Overview and Simulation of DC-DC-AC and Z-Source Grid Connected Inverters

Focus:

Energy sources such as batteries, fuel cells, capacitors, solar cells etc., produce dc power, and it is often necessary to interface these sources to the main power grid. The dc voltage generated is stepped up and inverted to the appropriate voltage and frequency for grid integration by power electronic (PE) interface modules employing dc-dc converters and dc-ac inverters. This article presents an overview of two of the possible methods of inversion: dc-ac inversion with a dc-dc converter interface, or single-stage Z-source based dc-ac inversion. These two approaches are described and design examples are presented for a typical 1-kW application. The circuit designs are verified with the aid of Saber Sketch simulation software and first-cut design procedures are presented that help power supply designers reduce the design time.

What you’ll learn:

• How to understand operation of a two-stage dc-ac step-up inverter and a single-stage Z-source inverter
• How to speed the design of single- and dual-stage grid-connected inverters

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Author & Publication:

Veda Prakash Galigekere, Dakshina Murthy Bellur, and Marian K. Kazimierczuk, Wright State University, Dayton, Ohio, How2Power Today, Feb 19 2010

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