A photovoltaic power grid-connected system based on solid-state transformers

Abstract

The invention relates to a photovoltaic power generation grid-connected system based on a solid-state transformer. The photovoltaic power generation grid-connected system based on the solid-state transformer comprises a photovoltaic array, the solid-state transformer, an output filter, a load and a power grid, wherein the solid-state transformer is connected with the photovoltaic array, the output filter and the load respectively; and the output filter is connected with the power grid. Compared with the prior art, the photovoltaic power generation grid-connected system based on the solid-state transformer has the advantages of high stability, strong anti-interference performance, quick dynamic response, capacity of realizing bidirectional flow of energy and the like.

Description

technical field [0001] The invention relates to a grid-connected photovoltaic power generation system, in particular to a photovoltaic power grid-connected system based on a solid-state transformer. Background technique [0002] In recent years, with the decline in the cost of photovoltaic cells and the improvement of photovoltaic power generation efficiency, the application prospects of photovoltaic power generation are unprecedentedly broad. Grid-connected photovoltaic power generation is an important development direction of photovoltaic power generation. Compared with independent photovoltaic power generation systems, energy storage can be omitted However, due to the randomness, intermittent, and periodicity of photovoltaic power generation, the safety and reliability of grid-connected photovoltaic power plants and their access systems are facing new challenges. [0003] The classic circuit structure of photovoltaic power generation grid-connected system is divided into ...

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Problems solved by technology

[0003] The classic circuit structure of photovoltaic power generation grid-connected system is divided into single-stage transformerless structure, two-stage structure with power frequency transformer isolation and multi-stage structure with high frequency transformer isolation; the purpose of adopting single-stage transformerless structure First, the structure is simple, the cost is low, and the efficiency is high, but the input and output are not electrically isolated, the input voltage range is small, and the control is not flexible enough; the two-stage structure control with power frequency transformer isolation is more flexible, and the boost ratio is large. Isolation, but the existence of power frequency transformers increases the cost and volume of equipment; in order to overcome this defect, a multi-stage structure with high frequency transformer isolation has appeared, but this structure is complicated and only suitable for small power occasions. The power frequency transformer needs to be boosted to be connected to the 10kV power grid

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