SoC control for improved battery life and throughput performance under VST‐TDMA

Abstract

Energy independence is a wireless device quality that demands the utmost exigency. Energy harvesting devices (EHD) alleviate the energy constraints demanded by these nodes and with the use of protocols, such as variable slot time-time division multiple access (VST-TDMA) energy self-sustainability can be attained at the cost of throughput. To allow high throughput levels and self-sustainability the system can allow the power consumption to be greater than the energy harvesting rate while a state-of-charge (SoC) of 30% or greater is maintained. To achieve this the system must accurately estimate the SoC, which is not a trivial task. In this work, a battery model is incorporated into the VST-TDMA protocol to estimate the battery model parameters, including the SoC, which successfully allows it to maintain appropriate SoC levels.

Operation of the Hybrid Photovoltaic-Battery System on the Electricity Market—Simulation, Real-Time Tests and Cost Analysis

“…Groot et al [28] analyzed the impact of different variables, among others the state of charge (SOC), on BESS ageing. Their outcomes, compared with those obtained by Choi and Lim [29], Diúçi et al [30], Takahashi et al [31] Zhang et al [32], Torres et al [33], and Zhu et al [34], led the authors to the conclusion that the battery SOC range should be 0.4-0.8. Therefore, the energy storage capacity should be approximately 70% higher than the one obtained from equation 3.…”