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 by
using  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.