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The variable frequency drive (VFD) motor controller has been proven to be suitable for shipboard low voltage and medium voltage application. The variable speed electric propulsion is very popular due to the full range of speed and torque controls. The medium voltage variable speed electric propulsion can achieve high propeller power a with full range of speed controls. There are types of power switching devices used with VFDs. This chapter discusses the use of IGBT which are semiconductor switches that are turned on and off, creating a pulse width modulated output with regulated frequency. The smart ship system design concept can be embodied in “digital twin” in view of low cost computing, powerful analytical platforms of data mining, machine learning, and data networking technology. Any complex ship design and development fidelity can be achieved by using “digital twin”, so that there is no need for arbitrary simulation, costly hardware in the loop prototyping. |
