DC link voltage control device of rectifier using load current observer and forward direction control device of pulse width modulation rectifier

摘要

The present invention relates to a control apparatus for a rectifier, and more particularly, to a DC link voltage control device and a pulse width modulation rectifier using a load current observer for reducing a capacity of a DC link capacitor serving as a buffer between a power source side converter and a load side converter. And a control device.;A voltage control unit using the load current observer, a current control unit for controlling the output of the voltage control unit with a predetermined current gain characteristic, a voltage modulation unit for outputting pulse-width modulated output of the current control unit output, An unknown load current is estimated including the power supply link portion switched according to the negative pulse width modulated gating signal, the power supply portion supplying power to the power supply link portion, the buffer portion for reducing the power fluctuation of the load side and the unknown load, The capacity of the capacitor acting as a buffer between the power source side converter and the load side converter can be remarkably reduced.