Parallel control study of multiple inverters for ship electric propulsion

In order to solve the control problem of parallel inverters for large-capacity motor drive system, a controlling means is studied which can change the instantaneous reference voltage of parallel inverters. Based on the equivalent circuit models and the control principles of the motor current and circulating current, the master-slave control system of changing the instantaneous reference voltage of parallel inverters is developed, and the concrete realization of current balancing control is also developed. At last, using PSCAD software, the propulsion system model with propeller load is established. The simulation results show that the motor current can be shared and has good dynamic characteristics as the single inverter system.