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High-frequency isolation single-phase photovoltaic grid-connected system and control method thereof

A high-frequency isolation and control method technology, applied in photovoltaic power generation, single-grid parallel feeding arrangement, output power conversion device, etc. and other problems, to achieve the effect of overcoming adverse effects, high conversion efficiency, and simple topology

Inactive Publication Date: 2010-07-14
SOUTHEAST UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to propose a high-efficiency high-frequency isolated single-phase photovoltaic grid-connected system. Through the change of topology, the traditional photovoltaic grid-connected system is bulky, complex in topology, and has many transformation stages, stability and efficiency. Lower problems

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Embodiment Construction

[0035] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0036] Such as figure 1 As shown, the grid-connected single-phase photovoltaic power generation system includes photovoltaic arrays, buffer capacitors, high-frequency converters, high-frequency transformers, AC / AC converters, filters and grids. The output of the photovoltaic array is connected to the DC terminal of the high-frequency converter through the buffer capacitor, the AC terminal of the high-frequency converter is connected to the N1 winding of the high-frequency transformer, the N2 winding of the high-frequency transformer is connected to the AC / AC converter, and the AC / AC converter The output of the filter is connected to the grid. Among them, the high-frequency converter can choose a DC / AC converter in which various energy can flow in both directions, such as Figure 4 , the full bridge circuit shown in 5. There are two types of AC / AC co...

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Abstract

The invention provides a high-frequency isolation single-phase photovoltaic grid-connected system and a control method thereof. The high-frequency isolation single-phase photovoltaic grid-connected system consists of a photovoltaic array, a buffering capacitor, a high-frequency converter, a high-frequency transformer, an AC / AC converter, a filter and an electric power grid. A high-frequency chain-linked technology is utilized, so the electrical isolation between a photovoltaic power generation system and the electric power grid can be realized, the isolation transformer and the weight and the size of the entire system are reduced, only two-level power conversion is required, the topology is simplified, and the reliability of the entire system and the electric power transformation efficiency are improved. In addition, aiming at the characteristics of the topology and the photovoltaic system, an optimized control algorithm is proposed, so the unfavorable influence of the system from the fluctuation of the voltage outputted by the photovoltaic array can be overcome, the high quality of the electric power outputted by the entire system can be ensured, the distortions is small, the dynamic reaction is fast, the energy can flow in two directions, and reactive compensation can be supplied according to the requirement of the electric power grid.

Description

technical field [0001] The invention relates to a topology of a high-frequency isolated single-phase photovoltaic grid-connected system and a control method thereof, belonging to the field of new energy, in particular to the technical field of renewable energy power generation. Background technique [0002] In recent years, the aggravation of the energy crisis and the enhancement of people's awareness of environmental protection have promoted the rapid development of distributed power generation technology in countries all over the world. As a kind of distributed power generation technology, photovoltaic power generation has attracted much attention because of its cleanness and environmental protection, low noise pollution, low maintenance cost, and can improve the stability and flexibility of the entire power system. More and more photovoltaic grid-connected systems are being used Put into use. At the same time, the grid-connected operation will cause major changes in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/18H02M7/537H02M5/293
CPCY02E40/30Y02E10/563Y02E10/56
Inventor 周克亮朱力朱文杰苏秀娥周文华
Owner SOUTHEAST UNIV
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