Abstract
Currently, residential photovoltaic power generation system is increasingly used worldwide. In this paper, an optimized structure of residential photovoltaic (PV) power generation system with 1500V DC bus is proposed. It includes PV panels, a three-level boost converter, a high efficiency isolated bidirectional DC-DC converter, battery and three-phase five-level DC-AC converter that can work under islanding mode or grid-connected mode. The higher DC bus voltage greatly reduces line loss and improves efficiency of the system. An energy management scheme used for the system is proposed in this paper to guarantee the stability of the system and to increase its economic benefits. Besides, the optimized method for the structure of the bidirectional dc-dc converter is proposed. This structure can achieve higher DC voltage gain and higher efficiency. Furthermore, for low voltage battery application in the residential system, LLC and CLLC under DC transformer (DCX) mode are evaluated and the LLC is selected as the isolated bidirectional DC-DC converter. The optimized designed method of bidirectional LLC is proposed. Finally, experiments are carried out to verify the performance of the optimized converters and the system.
Highlights
Since photovoltaic power generation system can alleviate energy crisis and reduce environmental pollution, it has been applied worldwide [1].Residential photovoltaic power generation system is increasingly applied to houses [2], [3]
The scheme ensures the reliability of power supply for the residential load and increases the economic benefits via feeding back energy to the grid
To reduce the operation frequency range and obtain wide DC gain range, a bidirectional DC-DC converter based on LLC and buck/boost was proposed in a photovoltaic energy storage system [22]
Summary
Since photovoltaic power generation system can alleviate energy crisis and reduce environmental pollution, it has been applied worldwide [1]. Residential photovoltaic power generation system is aimed to provide continuous and reliable power supply to household loads [4] It is an active distributed network employing PV panels, battery energy storage system (BESS) and variety of converters and loads, operated grid-connected or islanded, in a controlled, coordinated way [5]. Shi: Control and Optimization of Residential Photovoltaic Power Generation System bus to reduces line loss and improve the efficiency of the system. This paper dedicates to optimizing the residential photovoltaic power generation system to achieve higher efficiency and higher economic benefits. The scheme ensures the reliability of power supply for the residential load and increases the economic benefits via feeding back energy to the grid.
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