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The development of power converter topologies, with an increased number of components seems to be an interesting
option in modern applications, especially in terms of reliability, efficiency, and current or voltage distortions
improvement. This paper focuses on AC–AC power converter technologies without DC-link energy storage
elements. The presented converter topologies are fully solid state devices with small passive elements, which are
implemented to filter off the high frequency current or voltage components. In the paper the converters are
categorized into two groups: with constant output frequency and with variable output frequency. The first group
includes topologies of matrix and matrix-reactance choppers. The second group includes frequency converters based
on the matrix converter, taking into account indirect (indirect matrix converter, sparse matrix converter) and multilevel topologies (three level- output-stage indirect matrix converter, indirect three-level sparse matrix converter,
multi modular matrix converters), as well as the topology allowing an increase in the output voltage (matrixreactance frequency converters). Various converter topologies are presented, compared, and evaluated against output
voltage and phase control, input power factor control, and number of components. The features of each converter
configuration are considered in the context of alternative applications for commonly used converters with DC-link
energy storage devices.
Existing System
Due to increased attention towards applications of PE in industrial and domestic areas the development of
different topologies is required. The goal of PE in the aforementioned applications is to control the flow of energy
from an electrical source to an electrical load, to meet a specific need with high efficiency, high availability, high
reliability, small size, light weight, and low cost.
Proposed System
The major aim of this paper is to provide a state of the art account for AC–AC three-phase converters without DClink, as well as to show the most important configurations and their characteristics. In some cases, the use of a
converter with DC energy storage element is recommended, e.g., in power interfaces of DC energy magazines and
sources or DC microgrids. A large part of such application uses AC–AC conversion: variable-speed drivers, AC
generators (wind turbines, small hydro, flywheel energy storage, micro turbines) and FACTS devices, etc. However
in such cases the commonly used AC–DC–AC converters can be substituted by AC–AC converters without a DC-link.