Peak-off-peak load shifting for optimal storage sizing in hybrid power systems using Power Pinch Analysis considering energy losses

Nor Erniza Mohammad Rozali, Wai Shin Ho, Sharifah Rafidah Wan Alwi, Zainuddin Abdul Manan, Jiří Jaromír Klemeš, Mohamad Nur Salam Mohd Yunus and Syed Amarul Adli Syed Mohd Zaki

Energy, 2018, vol. 156, issue C, 299-310

Abstract: The difference in electricity pricing based on the time of power use has led to load shifting from peak to off-peak hours in hybrid power systems (HPS). Apart from optimising electricity cost, shifting of the load may also change the capacity of storage in the system. Power Pinch Analysis has been recently applied to guide load shifting aiming to minimise the cost of electricity, considering the peak and off-peak electricity pricing. The HPS was assumed to be ideal with 100% efficiency, which is not achievable in actual operational condition. This work extends the study by scrutinising the effects of peak-off-peak load shifting on the capacity of storage in HPS. The effects of energy losses due to the inefficiency during power conversion, transfer and storage in the HPS are considered in developing shifting heuristics to ensure optimal storage size is achieved. Implementation of the proposed load shifting strategy on a case study demonstrates that a reduction of up to 30% in the storage size can be achieved, which led to a minimum storage cost. The distribution of peak hours' demand to off-peak hours also successfully provide significant savings in the electricity bill.

Keywords: Power pinch analysis (PoPA); Hybrid power systems (HPS); Load shifting; Renewable energy (RE); Energy losses (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (9)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:156:y:2018:i:c:p:299-310

DOI: 10.1016/j.energy.2018.05.020

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