Method and system for detecting a zero current level in a line commutated converter

摘要: A method and system for determining zero current level occurrences in a reversible power converter without requiring additional component complexity costs. digital controller selectively determines the line to voltage most recently fired thyristor pair. The selected is identified as bridge reconstruction compared against actual output conducting bridge. difference between two signals error sign of its magnitude indicative load occurrence. occurrence happens whenever drops below zero. This indication positive substantially instantaneous safely enables reversal flow risk faults due cross-bridge short circuits.