SOLAR POWER CONVERSION SYSTEM AND METHOD

摘要

A solar power conversion system includes a photovoltaic array having photovoltaic modules for generating direct current (DC) power. A power converter in the system converts the DC power to alternating current (AC) power. The AC power is transmitted to the power grid via a transformer coupled between the power converter and the power grid. The transformer is connected to the power grid at the point of common coupling (PCC) and to the power converter at output terminals. A voltage estimation module is configured to estimate a voltage at PCC based on a measured voltage magnitude, a measured real power and a measured reactive power at the output terminals, and a reactance of the transformer. A controller is provided in the system for generating switching command signals for the power converter based on the voltage at PCC.

主权项

1. A solar power conversion system comprising:
a photovoltaic array having photovoltaic modules for generating direct current (DC) power; a power converter for converting the DC power to alternating current (AC) power; a transformer coupled between the power converter and a power grid for transmitting the AC power to the power grid, wherein the transformer is connected to the power grid at the point of common coupling (PCC) and to the power converter at output terminals; a voltage estimation module configured to estimate a voltage at PCC based on a measured voltage magnitude, a measured real power and a measured reactive power at the output terminals, and a reactance of the transformer; and a controller for generating switching command signals for the power converter based on the voltage at PCC.