The invention discloses a multi-level
current source inverter and a control method thereof, and relates to the field of
electric energy conversion control, the multi-level
current source inverter is composed of an MCSI module, a
direct current side
inductor, a
coupling capacitor, a
ripple filter and a control module, and the three-phase
voltage and the load current of a
power grid are measured; calculating a reference phase under a synchronous rotating coordinate
system by using a three-phase digital phase-locked loop, and further decomposing the reference phase into a current mean value and an
alternating current component; a current error is obtained by establishing an additional control loop, and a DC component is separated from the current error by using a PI controller; generating a
reference current under the synchronous rotating coordinate
system, converting the
reference current back to the three-phase coordinate
system, and generating an actual gate driving
signal of the MCSI module; based on an actual gate pole driving
signal, the actual gate pole driving
signal serves as a reference of phase shift carrier SPWM, and zero-state selection and inductive current balance are optimized in cooperation with a
logic state machine. The method is used for
power quality management of the power distribution network,
harmonic waves and reactive power can be suppressed, and switching loss is reduced.