Island microgrid bus voltage imbalance and harmonic compensation method and system

The invention relates to an island microgrid bus voltage imbalance and harmonic compensation method and system, and the method is characterized in that the method comprises the following steps: 1) selecting an inverter with the maximum capacity in a microgrid as a main inverter, and enabling the rest inverters in the microgrid to serve as slave inverters; 2) acquiring current in a load of the microgrid, and performing component separation on the acquired load current; 3) generating a reference current instruction value of the slave inverter according to each component of the load current; 4) obtaining a current tracking error of the slave inverter; 5) enabling the obtained current tracking error to pass through a slave inverter current inner loop controller to generate a PWM modulation signal; 6)enabling the slave inverters to control the turn-off of the IGBT according to the generated PWM modulation signal so as to control the output compensation current of the slave inverter, therebycompleting island microg