Experimental Verification of Nickel-Metal Hydride Battery Parameters Estimation
Abstract
The impact of renewable energy in modern power systems entails the uses of energy storage system. The problem associated with the increase load demand that requires the continuity of power without any interference. One of the best solution is the uses of rechargeable battery. However, incorrect use of the battery not only can harm the equipment but also to the internal structure of the batteries itself. This paper focuses on the experimentation of nickel-metal hydride (Ni-MH) battery byusing time-frequency distribution (TFD) which is spectrogram. The charging and discharging signal of the batteries is represented in time-frequency representation (TFR) and then, from the TFR, parameters of the battery such as instantaneous of means square voltage (VRMS), instantaneous of direct current voltage (VDC) and instantaneous of alternating current voltage (VAC) are estimated. The experiments are conducted with three different Ni-MH battery with fixed nominal voltage of 12V and storage capacities of 1.3Ah, 1.8Ah and 2.7Ah respectively. The results are compared with the battery model implemented in MATLAB Simulink. The results show that there are similarities between the battery model and experimental data. Thus, the technique can be implemented through battery model.
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