Abstract
In recent years, there has been a desire to improve electricity generation and consumption, to reach sustainability. Technological solutions today allow a rational use of electricity with good overall performance. Traditionally, from production to distribution, electrical energy is AC-supported for compatibility reasons and easy voltage level transformation. However, nowadays most electric loads need DC power to work properly. A single high-efficiency central AC-DC power converter may be advantageous in eliminating several less efficient AC-DC embedded converters, distributed all over a residential area. This paper presents a new single-phase AC-DC converter using one active bridge (most isolated topologies are based on the dual active bridge concept) and a high-frequency isolation transformer with low-value non-electrolytic capacitors, together with its control system design. The converter can be introduced into future low-voltage DC microgrids for residential buildings, as an alternative to several embedded AC-DC converters. Non-linear control techniques (sliding mode control and the Lyapunov direct method) are employed to guarantee stability in the output DC low voltage with near unity power factor compensation in the AC grid. The designed converter and controllers were simulated using Matlab/Simulink and tested in a lab experimental prototype using digital signal processing (DSP) to evaluate system performance.
Highlights
In a growing and economically interconnected society, the availability of energy enhances economic growth
This paper presents and designs the converter topology and the digital control system for a single-phase AC-DC converter using a high-frequency isolation transformer with low-value non-electrolytic capacitors to be introduced into a future low-voltage DC network in residential buildings, as an alternative to traditional AC networks
AC-DC including converter, This paper presented the design of digital controllers for a single-phase converter, aincluding high-frequency isolation transformer and low-value non-electrolytic capacitors, to be introduced a high-frequency isolation transformer and low-value non-electrolytic capacitors, to be including a high-frequency isolation andbuildings, low-valueasnon-electrolytic capacitors, to AC
Summary
In a growing and economically interconnected society, the availability of energy enhances economic growth. Most topologies use passive elements in their essence that act as filters for harmonic content caused by the switching of the semiconductors and, in the particular case of single-phase converters, the occurrence of ripple at the double of the line frequency in the output current, which can cause instability in the dc network [23] This problem is usually solved by adding extra capacity value to the output filter or is naturally diminished when connected directly to batteries when there is energy storage. This paper presents and designs the converter topology and the digital control system for a single-phase AC-DC converter using a high-frequency isolation transformer with low-value non-electrolytic capacitors to be introduced into a future low-voltage DC network in residential buildings, as an alternative to traditional AC networks. Texas Instruments to verify and evaluate the performance of the proposed control
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