Design ofa State Feedback Controller for

lzmyl

Abstract-- Voltage sags have become a major power
quality issue encountered by industries in recent years. The
voltage sag compensator, based on the transformer-coupled
series-connected voltage source inverter, is among the most
cost-effective solution to protect sensitive loads. Many
voltage sag compensators adopt open-loop control strategies
to increase the response speed for the sag compensation. But
the L-C filter installed at the output of the voltage source
inverter could introduce oscillations in transient, and the
voltage disturbance could appear due to varied load
conditions. In addition, the coupling components could
appear due to coordinate transform for simplified operation
process. These are unclear how errors can affect the
performance of the voltage sag compensation. A closed-loop
control scheme is proposed to accomplish active damping
without using any damping resistors, and raise the resonant
frequency of the system to provide effectively disturbance
rejected ability. The entire controller is implemented in the
synchronous reference frame, and all the cross-coupling
terms under the synchronous reference frame are identified
and de-coupled in the controller. Detailed explanations are
presented, and the effectiveness of the proposed scheme is
verified by laboratory test results.

hypo_qu

多谢楼主的无私奉献！