Design of defined controller for modular multilevel converter based on CPS-SPWM in PSCAD

This paper introduces a convenient and efficient way to model a CPS-SPWM based MMC control system with 4 defined controllers, which are power control block, averaging and balancing control block, carrier and firing pulses block. Equivalent control subroutines are designed in the defined controller, which can change the labor of duplication of large amount of control components to simply change the times of calling those subroutines. Also the control signals, such as capacitor voltages and firing pulses, are designed and processed in array form, which significantly simplifies the control system. Interfaces of the defined controller are introduced for other available additional control strategies. Simulations results in PSCAD/EMTDC show that the defined controllers proposed in this paper are of effectiveness and efficiency.