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Photovoltaic-Wind and Hybrid Energy Storage Integrated Multi-Source Converter Configuration for DC Microgrid Applications
摘要： In this paper, a new multi-source and Hybrid Energy Storage (HES) integrated converter configuration for DC microgrid applications is proposed. Unlike most of the multi-input converter configurations, a supercapacitor-battery based HES is interfaced which effectively handle the power fluctuations due to the wind, photovoltaic and sudden load disturbances. Integration of supercapacitor to respond for high-frequency fluctuations increase the lifetime of battery storage and reduce the sizing of the storage unit. The control structure is framed to achieve power balance in the system along with basic functionality such as operating renewable sources (PV and wind) at maximum power point and charging and discharging of energy storage based on power availability. The key highlights of the proposed configuration are: (i) Less number of switches, (ii) Voltage boosting, voltage regulation of supercapacitor and power-sharing among battery and supercapacitor are inherent, (iii) Simple control structure with a reduced number of sensors. The detailed analysis, modeling, and design of the proposed configuration and control structure are presented along with MATLAB simulations and experimental validations.
关键词： DC microgrid,Battery,Supercapacitor,Photovoltaic,Wind,Multi-port converter,Hybrid Energy Storage (HES)
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Comparison of AC and DC Bus Interconnections of Energy Storage Systems in PV Power Plants with Oversized PV Generator
摘要： Oversizing the photovoltaic (PV) generator improves the profitability of PV power plants, but a downside is energy losses due to power clipping. If an energy storage system (ESS) is needed, connecting it to the DC side enables the utilization of the clipped energy. We compared the AC and DC bus interconnections of ESS in a typical building block of megawatt-scale PV power plants. The DC bus interconnection increases the energy yield, but also the utilization of the ESS. The operation of the ESS is affected by the production profile of the PV generator, ESS energy capacity and DC-to-AC power ratio.
关键词： optimal design,power plant design,energy storage systems,PV generator
更新于2025-09-19 17:13:59
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Laser graving assisted fabrication of foldable supercapacitors for on-chip energy storage
摘要： Planar supercapacitors (SCs) have been regarded as promising energy devices for on-chip electronics and they should be evaluated by areal performances due to the very limited available areas. However, these SCs usually suffer from inevitable size increase for the requirement of substrates, current collectors and sealants. This work presents a kind of freestanding, foldable and quasi-solid-state SCs that single SC units were stacked in the thickness direction with a common electrode to reduce their occupied areas. The foldable SCs can be fabricated in desired patterns by laser graving and their areal performances increase linearly with the assembled units. The energy density of a 5-units foldable SC is 177.9 μWh cm-2 at the power density of 2.78 mW cm-2 and it outperforms most planar SCs. Therefore, this work provides a new reference to improve the areal properties of on-chip SCs from device design.
关键词： nanocomposites,on-chip energy storage,foldable device,supercapacitors,carbon nanotubes
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Spatio-Temporal Downscaling of Hourly Solar Irradiance Data Using Gaussian Copulas
摘要： Recent advances in energy storage devices (ESDs) technology have enabled new guidance strategies for power generation and distribution on hybrid marine power plants, supported by new class regulations. In this paper, a new model to calculate the fuel saving and emission reduction potential is derived based on the ESD maximum charge/discharge rate, engine efficiency, and specific fuel oil consumption (SFOC) curve. Several cases were analyzed with generator disconnection and also without it. Spline approximation for the discrete fuel oil consumption curve is used for numerical solution and later optimized using the Karush–Kuhn–Tucker method. A second approach is proposed, using linear interpolation, reducing the optimization process computational time. It is shown that fuel savings can be increased and emissions reduced by charging and discharging the energy storage device. This is denoted as strategic loading according to the proposed model. The cases with highest potential for fuel saving are shown to be cases where generators are disconnected.
关键词： smart grids,energy storage,optimization,fuel economy,numerical models,analytical models,Hybrid power systems
更新于2025-09-19 17:13:59
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[IEEE 2019 Chinese Automation Congress (CAC) - Hangzhou, China (2019.11.22-2019.11.24)] 2019 Chinese Automation Congress (CAC) - Research on reactive compensation and grid-connected photovoltaic control strategy of a nRYHO type energy storage Quasi-z-source inverter
摘要： A combined control strategy of photovoltaic grid-connection, reactive power compensation and energy storage was proposed for a novel energy storage quasi-z source inverter. According to the different state of the battery, the system applies different control schemes. Based on the control strategy of the battery under normal conditions, this paper analyzes and discusses the unit power factor grid-connected, while ensuring the maximum utilization of photovoltaic cell energy efficiency and enhancing the stability of grid-connected power, and compensates the load with reactive power. Finally, simulation and experiment verify the effectiveness and correctness of the proposed strategy.
关键词： Unit power factor grid-connected,Quasi-z-source inverter,Reactive power compensation,Energy storage
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC) - Chengdu, China (2019.12.20-2019.12.22)] 2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC) - Research and Application of Grid-connected Control Device for Distributed Photovoltaic Power Supply
摘要： Distributed photovoltaic grid connection has impaired the power quality of the distribution network. Aiming at this salient problem, a regulation method for the voltage at the point of interconnection in the distribution network is proposed. Besides, the basic principles of voltage regulation device are introduced, and the computing method for the capacity energy storage battery configuration, matched with the power generation capacity, is given. The simulation model based on the full-control device is built in the PSCAD environment, which verified the accuracy of the control strategy and the favorable dynamic adjusting performance. Finally, by the prototype developed, the effectiveness of the new regulation method for the voltage at the point of interconnection in the distribution network is proved.
关键词： Voltage,Distributed photovoltaic,Energy storage,Simulation model
更新于2025-09-19 17:13:59
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Optimal Asset Planning for Prosumers Considering Energy Storage and Photovoltaic (PV) Units: A Stochastic Approach
摘要： In the distribution system, customers have increasingly use renewable energy sources and battery energy storage systems (BESS), transforming traditional loads into active prosumers. Therefore, methodologies are needed to provide prosumers with tools to optimize their investments and increase business opportunities. In this paper, a stochastic mixed integer linear programming (MILP) formulation is proposed to solve for optimal sizes of prosumer assets, considering the use of a BESS and photovoltaic (PV) units. The objective is to minimize the total cost of the system, which is defined as the combination of a solar PV system investment, BESS investment, maintenance costs of assets, and the cost of electricity supplied by the grid. The developed method defines the optimal size of PV units, the power/energy capacities of the BESS, and the optimal value for initial energy stored in the BESS. Both deterministic and stochastic approaches were explored. For each approach, the proposed model was tested for three cases, providing a varying combination of the use of grid power, PV units, and BESS. The optimal values from each case were compared, showing that there is potential to achieve more economic plans for prosumers when PV and BESS technologies are taken into account.
关键词： mixed integer linear programming,photovoltaic,prosumer asset planning,battery energy storage system
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 3rd Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC) - Chongqing, China (2019.10.11-2019.10.13)] 2019 IEEE 3rd Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC) - Capacity Configuration Method of Hybrid Energy Storage System for Stand-Alone Photovoltaic Generation System
摘要： To enhance photovoltaic (PV) utilization of stand-alone PV generation system, a hybrid energy storage system (HESS) capacity configuration method with unit energy storage capacity cost (UC)and capacity redundancy ratio (CRR) as the evaluation indexes is proposed, which is considering different types of load. First, the HESS power difference between the load demand power and the PV output power is obtained by the method, which is allocated by the low-pass filtering algorithm. According to the characteristics of power type and energy type energy storage device, the low frequency component is borne by the energy-type energy storage device, and the high-frequency component is borne by the power-type energy storage device, taking HESS charging and discharging efficiency，SOC upper and lower limits and capacity attenuation as the constraints. Then, based on the whole life cycle cost, analyzing the different effects of different PV power generation energy and load types on the indexes. Finally, the feasibility and effectiveness of this method are analyzed by 3 actual examples.
关键词： capacity configuration,hybrid energy storage system (HESS),Stand-Alone photovoltaic (PV) System,whole-life-cycle cost
更新于2025-09-19 17:13:59
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Solar Engineering of Thermal Processes, Photovoltaics and Wind || Energy Storage
摘要： Solar and wind are time-dependent energy resources. Energy needs for a very wide variety of applications are also time dependent but in a different fashion than the energy supply. Consequently, the storage of energy or other product of the process is necessary if these renewable resources are to meet substantial portions of our energy needs. Energy storage can be accomplished using thermal, mechanical, or chemical processes. Thermal storage is accomplished by heating or cooling a substance and recovering the energy at a later time by reversing the process. Mechanical storage and recovery can be accomplished by raising and lowering a mass, typically water, from one level to another level or by changing the rotational speed of a spinning wheel. Chemical storage is commonly accomplished through batteries but other chemical reactions are possible. Sometimes it is convenient to convert one form of energy to another before storing. The optimum capacity of an energy storage system depends on the expected time dependence of the energy source, the nature of loads to be met, the degree of reliability needed for the process, the manner in which auxiliary energy is supplied, and an economic analysis that determines how much of the load should be carried by solar or wind and how much by the auxiliary energy source. Note that auxiliary energy is assumed to be part of the process. The needed auxiliary energy could be another form of renewable energy. Consider a very large renewable energy system (like a large utility) where wind might make up temporary lack of solar (or vice versa) and hydro power is always available. In this chapter we set forth the principles of several energy storage methods and show how their capacities and rates of energy input and output can be calculated. In the example problems, as in the collector examples, we arbitrarily assume temperatures or energy quantities. In reality, these must be found by simultaneous solutions of the equations representing all of the system components. These matters are taken up in Chapter 10.
关键词： Thermal Storage,Chemical Storage,Mechanical Storage,Wind Energy,Energy Storage,Solar Energy
更新于2025-09-16 10:30:52
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Cooperative Management for PV/ESS-Enabled Electric-Vehicle Charging Stations: A Multi-Agent Deep Reinforcement Learning Approach
摘要： This paper proposes a novel multi-agent deep reinforcement learning method for the energy management of distributed electric vehicle charging stations with a solar photovoltaic system and energy storage system. In the literature, the conventional method is to calculate the optimal electric vehicle charging schedule in a centralized manner. However, in general, the centralized approach is not realistic under certain environments where the system operators for multiple electric vehicle charging stations handle dynamically varying data, such as the status of the energy storage system and electric vehicle-related information. Therefore, this paper proposes a method that can compute the scheduling solutions of multiple electric vehicle charging stations in a distributed manner while handling run-time time-varying dynamic data. As shown in the data-intensive performance evaluation, it can be observed that the proposed method achieves a desirable performance in terms of reducing the operation costs of electric vehicle charging stations.
关键词： solar photovoltaic system,energy management,electric vehicle charging stations,multi-agent deep reinforcement learning,energy storage system
更新于2025-09-16 10:30:52