US 12,233,995 B2
Load area tracking type ship battery management system
Jin Seok Oh, Busan (KR)
Assigned to KOREA MARITIME UNIVERSITY INDUSTRY—ACADEMIC COOPERATION FOUNDATION, Busan (KR)
Filed by KOREA MARITIME UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION, Busan (KR)
Filed on Sep. 29, 2022, as Appl. No. 17/956,782.
Claims priority of application No. 10-2021-0169608 (KR), filed on Nov. 30, 2021.
Prior Publication US 2023/0166819 A1, Jun. 1, 2023
Int. Cl. B63B 79/40 (2020.01); H01M 10/42 (2006.01); H01M 10/44 (2006.01); H01M 10/48 (2006.01); H02J 7/00 (2006.01)
CPC B63B 79/40 (2020.01) [H01M 10/425 (2013.01); H01M 10/44 (2013.01); H01M 10/48 (2013.01); H02J 7/0048 (2020.01); H01M 2010/4271 (2013.01); H01M 2220/20 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A load area tracking type ship battery management system in a ship battery management system composed of a power management system (PMS) configured to control electric power of a plurality of generators (C1, C2, C3, and C4) in a ship, a battery management system (BMS) configured to measure a state of charge (SOC), which is a charge amount of a battery in the ship, and an energy management System (EMS) configured to link and control the PMS, the BMS, and loads of the ship, the load area tracking type ship battery management system comprising:
a calculation unit configured to generate SFOC curve data periodically by calculating specific fuel oil consumption (SFOC, i.e., fuel consumption per unit output of the ship [g/kwh]) versus ship load factors represented by a combination of the present generators by the EMS;
a LF setting unit configured to specify a ship load factor point, at which one of the plurality of generators is allowed to be stopped, as a light load factor (LF) point in the SFOC curve data;
a HF setting unit configured to specify a ship load factor point, at which one of the plurality of generators should be additionally operated, as a heavy load factor (HF) point;
a Emax setting unit configured to obtain a highest point (Emax) of generator efficiency;
a Rmin setting unit configured to calculate battery charging efficiency in the LF to obtain a smallest load factor point (Rmin) bearing a generator load by battery charging; and
a Rmax setting unit configured to calculate battery charging efficiency in the HF to obtain a highest load factor point (Rmax) bearing the generator load by battery discharging,
wherein each ship load factor is tracked according to the combination of the plurality of generators,
the EMS increases the loads through the battery charging when a generator load factor is less than the Rmin, so as to return the generator load factor to be greater than or equal to the Rmin, and determines the state as an overload state to compensate for an overload amount by the battery discharging when a generator load factor is greater than the Rmax, so as to return the generator load factor to be less than or equal to the Rmax, thereby allowing each generator of the ship to operate in a Rmin to Rmax range, which is a section where a fuel consumption rate of the ship is optimized,
wherein the LF setting unit specifies the light load factor (LF) point by Equation 1 below

OG Complex Work Unit Math
Rn: whether n-th generator is running (1: run, 0: stop)
LF: conversion result of light load factor [%]
PMSL,F: based on PMS, light load factor [%] depending on the number of generators currently in operation (i.e., an arbitrary set value), load factor after one generator stops
Cn: capacity of n-th generator [kWh].