This MMC-based Motor propulsion system uses a 5-level MMC topology. Each level has 2 IGBT switches and one capacitor, in a half-bridge. This is connected in parallel to the DC bus. Inside the MMC there is a phase-shifted carrier-based PWM signal. A double closed-loop current/speed controller controls the motor.
\(i_{sa},i_{sb},i_{sc}\) are the three-phase stator currents, \(V_{cj}^{abc}\) is the jth three-phase submodule capacitor voltage. \(i_n^{abc}\) are the three-phase MMC upper and lower arm curtents, \(w_m\) is the motor speed, \(T_e\) is the electromagnetic torque, and \(\lambda\) is the flux. These are used as modulation signals for the inner MMC controller, which generates driving voltage pulses. The electrical part of the asynchronous propulsion motor is a a 4th-order state-space model and the mechanical part is a 2nd-order state-space model. It is assumed that the motor is a direct drive to the submarine screw.
[[MMC Submodule models]] – combination of conductance and VCCS
[[Bow Thruster]] – can also use a MMC inverter
- chenComprehensiveRealTimeHardwareIntheLoop2020
Backlinks:
[[Capacitor]]
[[IGBT]]
[[IGBT Switches During Regenerative Braking]]
[[Magnetic Flux Lines]]
Nuclear Submarine Model
[[Phase Shift Keying]]
[[PWM Signals]]
[[State-Space Model]]
[[Submarine Screw]]
[[Torque]]