Topic
State of charge
About: State of charge is a research topic. Over the lifetime, 12013 publications have been published within this topic receiving 201419 citations. The topic is also known as: SoC & SOC.
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TL;DR: In situ neutron powder diffraction measurements of a commercial lithium-ion battery reveal perturbations to the phase evolution of the LixC6 electrode caused by overcharge as mentioned in this paper.
81 citations
04 May 2015
TL;DR: In this paper, a controller based on fuzzy logic, which integrates an objective state-of-charge (SoC) for V2H application, is presented to help the grid to meet the household loads during peak period.
Abstract: Plug-in hybrid electric vehicles (PHEVs) are seen to be a step forward in transportation electrification, to replace internal combustion engine (ICE)-based conventional vehicles. However, to consider the vehicle-to-home (V2H) and home-to-vehicle (H2V) capabilities, new energy control strategy has to be developed to avoid new peaks consumption. This paper presents a novel controller based on fuzzy logic, which integrates an objective state-of-charge (SoC) for V2H application. The V2H capability is used when the PHEV is connected to the home to help the grid to meet the household loads during peak period. The SoC objective is the minimum SoC that the PHEV has to have when the driver connects the PHEV to the home. The proposed controller is applied on fourth different scenario.
81 citations
TL;DR: A two-stage coordination approach of price-based demand response (PBDR) and battery energy storage systems (BESS) to minimize the total operating cost and enhance operational reliability and results indicate the high energy utilization efficiency and strong operational reliability of the proposed coordination approach.
Abstract: Microgrids can effectively integrate distributed generation (DG) to supply power to local loads. However, uncertainties from renewable DG and loads may lead to increased operating costs or operating constraint violations. To solve these issues, this paper proposes a two-stage coordination approach of price-based demand response (PBDR) and battery energy storage systems (BESSs) to minimize the total operating cost and enhance operational reliability. In the first stage, day-ahead PBDR is scheduled, aiming to shift loads to improve renewable energy utilization efficiency. Considering limited prediction horizon of uncertainties when dispatching BESSs, hourly state of charge (SoC) limits are also optimized over the whole-day horizon with consideration of BESS degradation cost in the day-ahead stage. Then in the second stage, the BESSs are dispatched hourly within the optimized SoC limits to track uncertainty realization and compensate the first-stage PBDR decisions. Furthermore, a two-stage interval optimization (TSIO) method is proposed to formulate the problem. Accordingly, a solution algorithm is developed to coordinately solve the two operation stages under the uncertainties. The proposed coordination approach is verified with uncertainty realization scenarios. The results indicate the high energy utilization efficiency and strong operational reliability of the proposed coordination approach.
80 citations
TL;DR: In this article, a state-of-charge (SOC) evaluation algorithm for high power lithium iron phosphate cells characterized by voltage hysteresis is described, based on evaluating the parameters of an equivalent electric circuit model of the cell and then using a hybrid technique with adequate treatment of errors, through an additional extended Kalman filter.
80 citations
TL;DR: In this paper, a grey extended Kalman filter and a novel open-circuit voltage model for the estimation of the state of charge of lithium-ion batteries are presented, and the experimental results show good agreement with the estimation results.
80 citations