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Summary Medium voltage direct current (MVDC) is an emerging trend in ship power system to cater the growing power demand in modern navy applications. Marine diesel oil (MDO) is the primary fuel in the shipping sector. However, with rising oil prices and harmful emissions, there is a greater need than ever for ship operators to consider clean power generating options. Keeping this in mind, this paper aims to present a renewable energy solution through development and integration of a three‐phase self‐excited induction generator (SEIG)–based renewable biofuel generator in MVDC ship power system. A three‐phase current controlled voltage source inverter (VSI) working as a static synchronous compensator (STATCOM) performs multiple tasks of harmonic elimination and regulation of the generated voltage under varying load. Gating pulses to the STATCOM switches are generated using indirect current theory‐based controller. An integral sliding mode‐controlled direct current to direct current (DC‐DC) converter feeding ship service loads in MVDC shipboard system has taken as a nonlinear load. A laboratory prototype of the complete system has developed to validate the concept.

This paper presents an investigation on mitigation of current harmonics, using Cascaded H-bridge Multilevel Converter (CHB-MLC)-based Shunt Active Power Filter (SAPF). Development and analysis of SAPF for harmonic compensation in distribution network for power quality improvement has been discussed. In the proposed work, transformer-less CHB MLC is used which reduces weight and cost of the system. Moreover, a novel controller based on average power method is adopted for generation of compensation active filter current. In order to generate switching signals, multi-carrier Alternate Phase Opposition Disposition (APOD) — Pulse Width Modulation (PWM) schemes are used. The proposed CHB-MLC SAPF reduces the source current THD below 5%. The results are simulated in MATLAB/Simulink and demonstrate the effective mitigation of current harmonics with APOD-PWM schemes. Opal-RT OP4500 real-time digital simulator is used to validate the proposed scheme under different steady state and transient conditions.

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