Abstract
Due to the advantages of power supply systems using the DC distribution method, such as a conversion efficiency increase of about 5–10%, a cost reduction of about 15–20%, etc., AC power distribution systems will be replaced by DC power distribution systems in the future. This paper adopts different converters to generate DC distribution system: DC/DC converter with PV arrays, power factor correction with utility line and full-bridge converter with multiple input sources. With this approach, the proposed full-bridge converter with soft-switching features for generating a desired voltage level in order to transfer energy to the proposed DC distribution system. In addition, the proposed soft-switching full-bridge converter is used to generate the DC voltage and is applied to balance power between the PV arrays and the utility line. Due to soft-switching features, the proposed full-bridge converter can be operated with zero-voltage switching (ZVS) at the turn-on transition to increase conversion efficiency. Finally, a prototype of the proposed full-bridge converter under an input voltage of DC 48 V, an output voltage of 24 V, a maximum output current of 21 A and a maximum output power of 500 W was implemented to prove its feasibility. From experimental results, it can be found that its maximum conversion efficiency is 92% under 50% of full-load conditions. It was shown to be suitable for DC distribution applications.
Highlights
Power distribution systems are divided into AC distribution systems and DC distribution systems
Since this paper focuses on the design and implementation of the proposed full-bridge converter, power management among converters in the proposed DC distribution system is adopted to implement the control method for the proposed system
This paper only describes the operational method for conduction mode (CCM) in the proposed full-bridge converter
Summary
Power distribution systems are divided into AC distribution systems and DC distribution systems. The overuse of fossil fuels has caused environmental pollution, leading to serious greenhouse effects. This has disturbed the balance of the global climate. A multiple energy source policy has been widely adopted in regard to power distribution systems. Compared to AC distribution systems, power systems using a DC distribution method have many advantages, such as a conversion efficiency increase of about 5–10%, a cost reduction of about 15–20% etc. For the DC distribution system, a power processor with a high conversion efficiency is adopted to transfer power to load. To implement carbon reductions, zero-emissions renewable energy approaches have been rapidly applied to power processors, in applications such as power generation for grid connections, DC/DC converters, electric vehicle construction, battery charge/discharger development, satellite power systems, etc
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