The invention discloses a master-slave parallel
inverter output current-sharing control method in the field of
inverter parallel control, and the method comprises the steps: carrying out the detectionof an output current fundamental wave and each
harmonic wave through an
inverter host, and sharing the output current fundamental wave and each
harmonic wave to an inverter slave in real time througha high-speed CAN communication
bus; enabling the inverter slave to receive output current information shared by the inverter host, synthesizing the output current information into
reference current,and enabling the output current to track the
reference current in a
static error-free manner through current closed-loop PI control, so the current-sharing control of current fundamental
waves and
harmonic waves of each order is realized. According to the invention, the calculation amount is small, the calculation precision is high, the real-time performance is good, and when a large-capacity nonlinear load is suddenly input into the output end, fundamental
waves and harmonic waves of each order can also realize dynamic
current sharing; and the control framework is simple, is not influenced bythe difference between the
output impedance of the inverters and the line impedance, can realize hot plug and the access or quit of one or more inverters in practical application, and does not influence the operation of the
control system.