Recently, the operation of electric power systems has become more difficult because the peak demand load is increasing continuously and also the daily load factor is worsening. Furthermore, global environmental issues are required in electric power systems. One countermeasure to overcome these problems is a study on the operation methods of a new electric power system that includes Dispersed Energy Storage (DES) Systems.
This paper deals with the introduction evaluation methods of the DES systems, especially based on the Secondary Battery Energy Storage System. Because DES systems are costly, it is important that their introduction evaluation is performed in a synthetical and quantitative fashion. The direct and indirect benefits of DES systems are classified and analyzed on utility and customer sides for cases where DES systems are introduced to distribution systems. On the utility side, the multiple functions of DES systems such as load leveling, uninterruptible power supply and effective utilization of distribution facilities are evaluated by quantitative methods, which are the successive approximation solution considering both the optimal generation mix and the optimal operation of DES systems, the interruption cost and present worth analysis, respectively. In addition, on the customer side, the forward dynamic programming approach related to the hourly pricing policies is presented. From the simulation results of the methods presented, it is verified that Secondary Battery Energy Storage Systems can be commercialized and introduced to the utility and customer in the near future.
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