The invention discloses a
control system and a control method of a three-phase four-bridge-arm
inverter based on phase-locked loop sequencing. The control method comprises the following steps: firstly, decomposing three-phase asymmetric
voltage and inductive current output by the three-phase four-bridge-arm
inverter into positive sequence, negative sequence, zero sequence
voltage and current components by adopting a symmetric component method; secondly, performing proper coordinate rotation transformation on the extracted negative-sequence and zero-sequence components; converting the negative-sequence and zero-sequence components into negative-sequence and zero-sequence components under a positive-sequence coordinate
system; then, using synchronous rotation coordinate transformation basedon a phase-locked loop; converting the extracted positive-sequence, negative-sequence and zero-sequence components into a dq0 rotating coordinate, then performing inverse Park and inverse Clark conversion on the three-sequence components subjected to double-loop PI control, and superposing the three-sequence components to obtain an instantaneous reference
voltage of a three-dimensional
space vector modulation
algorithm. According to the method, the conversion
algorithm of the negative sequence component of the traditional double-synchronous rotating coordinate
system is effectively simplified,and the adjustment time is reduced, so that the
system tends to be stable more quickly.