Abstract
This paper focuses on a full-bridge high-frequency isolated inverter which is proposed for distributed photovoltaic power supply application. The researched system consists of a full-bridge high-frequency DC/DC converter with the proposed symmetric phase-shift modulation algorithm to achieve the ZVS switching function and a line frequency unfolding bridge. It replaces the traditional two stages of independent control algorithms with a one-stage control to obtain high conversion efficiency. A TMS 320F2812 digital signal processor-based control technique is used to achieve the desired algorithm function for the grid-connected photovoltaic power system application. The researched system can have two operating methods depending on the applied situation. Finally, a prototype of 300 W with the maximum power point function is settled to verify the proposed idea.
Highlights
Renewable energy, such as wind power and photovoltaic cell (PV), feeding the distributed power systems, has been increased and more visibile
A PV power system can be divided into stand-alone system and grid-connected system depending on whether it is parallel with the utility or not
Inverters connected to the grid involve two major functions, one is to ensure that the PV is operated with the maximum power point tracking (MPPT) and the other is to inject a sinusoidal current into the grid [7–11]
Summary
Renewable energy, such as wind power and photovoltaic cell (PV), feeding the distributed power systems, has been increased and more visibile. Development of grid-connected photovoltaic power supply system is divided into two categories, including centralized converter type and microconverter type [1,2,3,4,5] The former uses multiple photovoltaic modules for string and/or parallel combination to concentrate the utility; such a framework is usually to adopt a stable DC bus design and it uses a large capacity of electrolyte capacitor to obtain a stable DC voltage; its advantages are more flexible than converter design, but with a worse operation performance for each module, while the latter, oppositely usually uses one or few photovoltaic modules to the utility, and the pulsating DC bus design and a small volume electrolyte capacitor are adopted. With the proposed control algorithm, it meets the requirement of a high efficiency conversion
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