Power conversion apparatus and control method thereof

摘要

An AC/DC conversion circuit of a power conversion apparatus receives an AC signal and has a switching element. A voltage sensing circuit generates a voltage reference signal according to an AC voltage signal. A harmonic generation circuit generates a harmonic injection signal according to the voltage reference signal. A subtraction circuit of a maximum power tracking circuit outputs a first DC signal and a second DC signal according to the voltage reference signal. An arithmetic circuit outputs a reference signal. A current sensing circuit outputs a feedforward signal according to one phase of an AC current signal. A current control circuit outputs an error signal according to the reference signal and the feedforward signal. A pulse width modulation circuit outputs a control signal to control the switching element according to the error signal and the harmonic injection signal, so that an aerogenerator operates at the maximum power approximation line.

主权项

1. A power conversion apparatus cooperated with an aerogenerator being controlled to operate at a maximum power approximation line, said power conversion apparatus outputting an AC signal including an AC voltage signal and an AC current signal, comprising:
an AC/DC conversion circuit receiving the AC signal and outputting a voltage signal and including a switching element; and a control module including:
a voltage sensing circuit generating a voltage reference signal according to the AC voltage signal;a harmonic generation circuit generating a harmonic injection signal according to the voltage reference signal; anda maximum power tracking circuit including:
a subtraction circuit outputting a first DC signal and a second DC signal according to the voltage reference signal;an arithmetic circuit outputting a reference signal according to the first DC signal, the second DC signal and a voltage error signal;a current sensing circuit outputting a feedforward signal according to one phase of the AC current signal;a current control circuit outputting an error signal according to the reference signal and the feedforward signal; anda pulse width modulation circuit outputting a control signal to control the switching element according to the error signal and the harmonic injection signal, so that the aerogenerator operates at the maximum power approximation line.