Battery power smoothing control in a marine electric power plant using nonlinear model predictive control

Abstract

This brief presents a power variation smoothing method using batteries on a weak ship grid. For some marine vessels, power fluctuations on the ac grid are large. This results in the large variations in the electrical frequency of the grid and excessive wear and tear of the power producers. Adding batteries connected to a dc/ac drive to smooth out the power fluctuations has been suggested. However, due to the large amount of fluctuation, batteries can overheat. Therefore, we suggest using a bandpass filter with the cutoff frequency parameters optimized by a model predictive control based on a power spectral density estimate of power consumption for disturbance prediction.