System for driving inverters in parallel

A system for driving inverters in parallel, the system comprising:

• a master controller;
• a plurality of slave controllers;
• a plurality of inverters configured to be controlled correspondingly by each of the slave controllers;
• and
• a control signal creation unit configured to generate control signals for the slave controllers by using data sent and received between the master controller and the slave controllers to enable the plurality of inverters to generate balanced output currents,
• wherein the control signal creation unit comprises:
• an input adder configured to find a difference between an average value of each of the 3-phase output currents of the plurality of inverters and each of the 3-phase output currents of the plurality of inverters;
• a proportional-integral (PI) controller configured to perform proportional-integral control on output values of the input adder;
• a current proportioning unit configured to perform proportioning on output values of the proportional-integral controller to differentiate a compensation range for each phase of currents;
• a limiter configured to perform limiting on output values of the current proportioning unit to limit the difference between the average value of each of the 3-phase output currents and each of the 3-phase output currents;
• and
• an output adder configured to add up pulse width information of the 3-phase output currents to output values of the limiter.