a method and apparatus for controlling the ac output of a power converter connected to an ac power network subjected to a voltage failure; and machine readable storage medium

摘要

a method and apparatus for controlling the ac output of a power converter connected to an ac power network subjected to a voltage failure; and machine readable storage medium is a power converter control system (324) having a phase tracker (404) that is designed and configured to estimate the voltage phase in the power network (208) that will be on the network when it recovers from a failure. Such power converter control system (324) allows a power source connected to the power grid to sink a fault event and continue to provide power to it at the projected phase and frequency. In one embodiment, the phase tracker 404 provides this estimate by having a slow enough response time such that the voltage drop or failure caused by the failure does not substantially affect the control system. In another embodiment, the phase detector is designed and configured to freeze the frequency of its output upon detection of a power grid failure event.