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Power management of hybrid energy storage system in a standalone DC microgrid

机译:独立DC微电网中混合能量存储系统的电源管理

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Standalone microgrids with renewable energy sources (like solar photovoltaic and wind systems) utilize energy storage devices (ESDs) to supply uninterrupted power to their system loads. To utilize the characteristic advantages of different ESDs, they are combined to form a hybrid energy storage system (HESS). Efficient control algorithms are necessary for power sharing among the multiple ESDs in a HESS to ensure maximum utilization of all the storage devices in the microgrid. Conventional fuzzy logic controllers (FLCs) are used to decide the power output of an ESD considering state of charge (SoC) of the fuzzy controlled ESD and the overall power demand (or availability) in the microgrid. However in a standalone DC microgrid with multiple ESDs, such conventional FLC algorithms cause over or under utilization of the ESDs since the instantaneous SoC status of other ESDs are not considered in its control logic. Thus a novel adaptive FLC (AFLC) algorithm is proposed in this paper to dynamically change the controlling rules of the AFLC as per the average SoC of other ESDs of the microgrid. The performance of the proposed AFLC algorithm is compared with the conventional FLC algorithm on the basis of duration of discharge, average power delivered and utilization factor of the ESDs in a DC microgrid using real time simulation study in OPAL RT 4510 simulator. The merits of using the AFLC for power sharing among multiple ESDs are further validated through experimental study performed on a microgrid hardware setup at Indian Institute of Technology Kharagpur, India.
机译:独立的微电网具有可再生能源(如太阳能光伏和风系统)利用能量存储装置(ESD)来为其系统负载提供不间断的电力。为了利用不同ESD的特性优势,它们组合以形成混合能量存储系统(HESS)。高效控制算法是电力共享所必需的,以确保MicroGrid中的所有存储设备的最大限度地利用。传统的模糊逻辑控制器(FLC)用于确定考虑模糊控制ESD的充电状态(SOC)和微电网中的总电量(或可用性)的ESD的功率输出。然而,在具有多个ESD的独立DC微电网中,这种传统FLC算法在其控制逻辑中不考虑其他ESD的瞬时SOC状态以来,因此在ESDS的情况下发生或利用。因此,在本文中提出了一种新的自适应FLC(AFLC)算法,以根据微电网的其他ESD的平均SOC动态地改变AFLC的控制规则。基于OPAL RT 4510模拟器中的实时仿真研究,将所提出的AFLC算法与传统FLC算法的性能与传统FLC算法进行比较,使用DC微电网中的ESDS的持续时间和ESDS的使用率。通过在印度的Indimity Theical of India India kharagpur研究所的微电网硬件设置上进行的实验研究,进一步验证了使用AFLC进行电力共享的功率共享的优点。

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