Method of active and reactive power control in ABC frame of a grid-tied converter

A grid-tied converter having a grid side that supplies an alternative current to the grid-tied converter, and a battery side that receives a direct current from the grid-tied converter, the grid-tied converter comprising:

• an AC/DC converter;
• and
• a bidirectional resonant DC/DC converter for controlling injection and absorption of grid side active and reactive powers by controlling direct active and reactive power injection or absorption from or to grid side in ABC frame where no DQ transformation is used, and wherein absorbed active power is controlled by controlling a battery charging current, and wherein injected active power is controlled by controlling discharging currents, and reactive power is controlled by controlling a phase shift angle between power factor correction current and voltage for each grid phase, wherein the bidirectional resonant DC/DC converter includes a full-bridge coupled to a resonant tank and a power transformer and rectifier stage, said full-bridge comprising a first pair of power switches S1/S2 and a second pair of power switches S3/S4, the bidirectional resonant DC/DC converter being configured such that in a first mode of operation:
• switch S1 and switch S4 are driven by a same two pulse pattern with a phase shift β1, said two pulse pattern comprising a first pulse P1 of width t1 and a second pulse P2 of width t2, P1 and P2 being separated by an off-time t3, and
• switch S2 and switch S3 are driven by a same single pulse pattern comprising pulse P4 of width t4 with a phase shift β2,
• wherein the grid-tied converter is configured to detect a grid configuration based on a grid side voltage and grid side angle measurement to determine a number of connected phases, and then automatically adapt a configuration of the grid-tied converter to the detected grid configuration.