Abstract
By combining the advantages of different energy storage technologies, the hybrid energy storage system (HESS) can satisfy the multiple requirements of prosumer systems. However, the required capacity of the HESS is larger than that of the single-battery energy storage system (ESS). This paper investigates the energy exchange within the HESS caused by the phase shift of the low-pass filter controller and its relevant impact on the HESS. The results show that unnecessary energy exchange results in an oversized capacity and increased energy loss. In addition, the increase in the time constant of the low-pass filter controller leads to a larger phase shift, further contributing to the increases in the total capacity and energy loss. Furthermore, this paper compares the single-battery ESS, the battery-supercapacitor HESS, and the battery-flywheel HESS implemented in a household-prosumer system along with a renewable energy source (RES). The comparison of the ESS combinations demonstrates the differences between their power flows, the required capacities of their individual energy storage devices (ESDs), their energy losses, their battery lifetimes, and their project costs. The results indicate that techno-economic analysis should be performed carefully to select the appropriate ESS solution for specific household-prosumer systems.
Highlights
Distributed renewable energy sources (RESs), represented by photovoltaic (PV) and wind power generation, have developed rapidly in recent decades
AlthoughanHESSs areof initially moreexchange costly, their costby increases relatively slowly comfilter pared controller, this study discussed the cause of the oversized capacity and increased to the single-battery energy storage system (ESS) due to the extended lifetime of the battery in hybrid energy storage system (HESS)
With the development of the battery market caused by increasing RESs and electric is used to deliver energy within the HESS instead of serving the DC bus
Summary
Distributed renewable energy sources (RESs), represented by photovoltaic (PV) and wind power generation, have developed rapidly in recent decades. There is no single energy storage technology that fully satisfies the multiple requirements of prosumer systems, such as high energy and high power density, short response time, long lifetime, and low cost. This paper aims to investigate the energy exchange caused by the phase shift and the relevant impact on the required capacity and energy loss of a HESS. The total costs of the ESS combinations that consist of NMC/LFP batteries and SCs/flywheels with a 30 year project lifetime are compared. Some degree of controllability with awith low ESD is directly connected to the DCThis bus.allows This allows some degree of controllability cannot utilizeutilize all of all theofcapacities of both the ESDs. active topologies acost, lowbut cost, but cannot the capacities of both the ESDs. active topolare capable of flexibly and independently controlling the power of flows both the.
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