Modulation and voltage balancing control of dual five-level ANPC inverter for ship electric propulsion systems

Abstract

Open-end winding motors are used extensively in ship electric propulsion systems, in which medium-voltage high-power inverters are a critical component. To increase the system voltage and power density, a dual five-level active neutral-point clamped (ANPC) inverter is proposed herein to drive medium-voltage open-end winding motors for ship electric propulsion. Each phase of this inverter comprises two five-level ANPC bridges and all the phases are powered by a common direct-current link. A hybrid modulation method is proposed to control this inverter. The series-connected switches in all the five-level ANPC bridges are operated at the fundamental frequency, and the other switches are controlled with a phase-shifted pulse-width modulation (PWM), which can achieve a natural balance between the neutral-point voltage and flying capacitor voltages in a carrier period. A closed-loop capacitor voltage balancing method based on adjusting the duty ratios of the PWM signals is proposed. The neutral-point voltage and flying capacitor voltages can be controlled independently and balanced without affecting the output phase voltage. Simulation and experimental results are presented to demonstrate the validity of this method.

Dynamic power management for all‐electric ships based on data‐driven propulsion power modelling

“…[30–32] regulated DC voltage sags through the PI voltage control method, but the fluctuations were not fully resolved in the presence of pulse loads. A closed‐loop capacitor voltage balancing method is used to stabilize the voltage of the support capacitor [33], but the voltage sags were still not suitably mitigated because of the timescale mismatch of generator speed regulation with pulse loads. Alafnan et al.…”

“…The existing research mainly focusses on constant‐speed propulsion scenario and rarely considers the uncertainties in ship propulsion [9, 10, 16–19, 21]. A coordinated framework between the main generators/auxiliary generators and the HESS is applied in this work, and the proposed three‐layer dynamic power allocation strategy solves the problems of multiple power resources balance, the voltage sags, and HESS health operation caused by uncertain propulsion scenarios that are rarely considered in existing research [28, 29, 32–35]. The proposed method is verified in two case studies including an RT‐Lab real‐time simulation to test the effects of the proposed method in harsh marine environment applications.…”

Model Predictive Current Control of Permanent Magnet Synchronous Motor for Marine Electric Propulsion

“…Propulsion motor drive control technology has been highly concerned by scholars as the core technology of marine electric propulsion system [7,8]. A current hysteresis vector control method for ship propulsion motor is proposed in [9], but this method has the problem of large electromagnetic torque ripple.…”

Double adaptive power allocation strategy in electric vehicles with battery/supercapacitor hybrid energy storage system

“…It is possible to see these vehicles in land transportation, 4,7,8 air transportation, 9,10 and marine transportation. 11,12 High efficiency, low energy consumption, less noise operation, and zero or low carbon emissions are among the main advantages of these vehicles. 13 Today, China, Germany, and the United States leading the globe in the number of registered EVs.…”

“…In these vehicles, the propulsion is provided by EMs fed from a DC energy source. It is possible to see these vehicles in land transportation, 4,7,8 air transportation, 9,10 and marine transportation 11,12 . High efficiency, low energy consumption, less noise operation, and zero or low carbon emissions are among the main advantages of these vehicles 13 .…”