SOLAR PHOTOVOLTAIC POWER CONDITIONING UNITS

摘要

We describe a photovoltaic power conditioning unit comprising: both dc and ac power inputs; a dc link; at least one dc-to-dc converter coupled between dc input and dc link; and a dc-to-ac converter coupled between dc link and ac output. The dc-to-dc converter comprises: a transformer having input and output windings; an input dc-to-ac converter coupled between dc input and input winding; and an ac-to-dc converter coupled between output winding the dc link. The output winding has a winding tap between the first and second portions. The ac-to-dc converter comprises: first and second rectifiers, each connected to a respective first and second portion of the output winding, to the dc link and winding tap; and a series inductor connected to the winding tap. Rectifiers are connected to the winding tap of the output winding via the series inductor wherein the series inductor is shared between the first and second rectifiers.

主权项

1. A power conditioning unit for delivering power from a photovoltaic dc power source to an ac mains power supply, the power conditioning unit comprising:
a dc power input to receive dc power from a photovoltaic dc power source; an ac power output for delivering ac power to said ac mains power supply; a dc link coupled between said dc power input and said ac power output; first and second dc-to-dc converters coupled between said dc power input and said dc link, wherein said dc-to-dc converters share a transformer winding and a series inductor; and a dc-to-ac converter coupled between said dc link and said ac power output.