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• W4283011520 abstract "Energy storage systems and smart grids cooperation are now crucial and will encourage collaborative engagement by different players in the energy market, offering sophisticated management and control approaches. Therefore, new advances and innovative solutions for such cooperation are of pre-eminent importance. Moreover, electric mobility should also be considered in this scenario. Electric vehicles (EVs) can be seen as distributed energy storage systems that generally need to be charged but, in some cases, can be adopted to support the grid due to vehicle-to-grid (V2G) and vehicle-for-grid (V4G) modes, offering advantages of controlled operation with active or reactive power. So, energy storage systems can be distinguished into aggregated and distributed structures, and they can be based on different technologies, such as batteries, fuel-cells, and super-capacitors. Furthermore, the integration of new renewable energy solutions with energy storage systems in smart grids should also be promoted. Power and energy management are crucial for the upcoming challenges and novel opportunities in smart grids. In line with this trend, this Special Issue aims to present further research on and developments in energy storage systems in smart grids, including power electronics converters, novel modulation schemes, energy and power management strategies, advanced battery packs and Battery Management Systems (BMSs). Novel renewable energy solutions are also of interest, as well as their cooperative and strategic integration with storage and EV chargers. Advanced EV services, such as V2G and V4G in the perspective of contributions to improve power quality, can also be considered. Three main topics can be found in this Special Issue: power electronic converters, converter and machine modelling and lithium-ion battery packs. In the following section, the papers accepted per each topic will be rapidly summarised along with their main achievements. Sun et al., in their paper ‘A gridded modular bidirectional high voltage gain soft-switching dc-dc converter and its multiport expansion’, proposed a novel high-gain soft-switching converter achieving a wide range expansion of port voltage and voltage gain by gridded filling of modules. An auxiliary zero-current transaction cell is added to each module to achieve full-load soft-switching operation in both power directions. The new topology is controlled by a distributed control system consisting of a centralised supervisor and local controllers displaced in each module to improve flexibility and dynamic performance. Efficiency analysis is provided to prove the better performance of the novel converter with and without the zero-current transaction cell. Simulations and experimental results on the SiC-based prototype have been provided to confirm the feasibility of the proposed dc-dc converter. Wang et al., in their paper ‘A type of piecewise and modular energy storage topology achieved by dual carrier cross phase shift SPWM control’, proposed a new concept and structure for a modular energy storage topology. The main idea is to break down the whole battery pack into the sub-modules of a modular multi-level converter by enabling the micro-unit concept. A dual carrier cross phase shift sinusoidal pulse width modulation is proposed to control the new topology allowing high fault tolerance, easy fault detection and localisation, and lower modules with the same output voltage. Simulations and experimental results validate the proposed structure and its control. Xiao et al., in their paper ‘Full-state discrete-time model-based stability analysis and parameter design of dual active bridge converter in energy storage system’, proposed a stability study of a DAB converter in different charging modes. After deriving its discrete-time small-signal model, the stability analysis has been conducted for constant current, constant power and constant voltage charging modes. Afterwards, a design of the system parameters has been carried out based on the previous analysis. Simulations and experimental results have been provided to validate the proposed approach. Liu et al., in their paper ‘Mathematical modelling and control of bearingless BLDC machine with motor and generator double modes for flywheel battery’, presented a bearingless brushless DC machine model for flywheel battery. First, the structure and the principle of the suspension force are introduced. Afterwards, the mathematical model for both motor and generator mode has been realised and validated by adopting finite element analysis. The control structure has then been designed based on the achieved model. Simulation results of rotation, power generation and suspension have been provided, which, together with experiments, demonstrate a stable suspension and excellent working performance. Ghaeminezhad et al., in their paper ‘Charging control strategies for lithium-ion battery packs: review and recent developments’, presented a review of the most modern charging techniques for lithium-ion battery packs, in order to enhance the speed and reliability of the charging process. First, battery charging circuit topologies and classification of possible charging control schemes have been introduced. The latter are classified into three main methods: non-feedback-based charging methods, feedback-based charging methods, and intelligent charging methods. Once all the different techniques have been presented, a comparison has been made among them, highlighting their advantages and disadvantages. Wang et al., in their paper ‘A Monte Carlo simulator to investigate cell-to-cell deviation in a grid-tied battery pack’, presented a study of phenomena leading to voltage deviation observed during grid-tied operation of the battery energy storage system. Electrochemical impedance spectroscopy and equivalent circuit modelling have been performed to obtain the distributions of the cell-equivalent circuit parameters. Monte Carlo simulations have been then conducted to study the cell voltage deviation. Simulations and experimental results lead to the same result: the highest cell voltage deviation is obtained at low and high state-of-charge because of the high value and large deviation of the cell internal resistance in that operating area. All of the papers selected for this Special Issue have shown a really important interest in energy storage technologies in smart grids. The main topics cover new power electronics converters for energy storage systems (ESS), their models along with the ones of the storage, stability and sensitivity analysis and the design and control of the entire system. Future research works will be oriented to the usage of ESS in smart grids and can promote their integration with renewable energy sources and electric vehicles. Data sharing not applicable – no new data generated, or the article describes entirely theoretical research." @default.
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• W4283011520 date "2022-06-17" @default.
• W4283011520 modified "2023-09-25" @default.
• W4283011520 title "Guest editorial: Energy storage in smart grids" @default.
• W4283011520 doi "https://doi.org/10.1049/pel2.12332" @default.
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