Optimal scheduled power flow for distributed photovoltaic/wind/diesel generators with battery storage system

Kanzumba Kusakana

Optimal scheduled power flow for distributed photovoltaic/wind/diesel generators with battery storage system

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Author(s): Kanzumba Kusakana ¹
- Affiliations: 1: Department of Electrical, Electronic and Computer Engineering, Central University of Technology, Free State, Bloemfontein, South Africa
Source: Volume 9, Issue 8, November 2015, p. 916 – 924
DOI: 10.1049/iet-rpg.2015.0027 , Print ISSN 1752-1416, Online ISSN 1752-1424

Received 21/01/2015, Accepted 28/04/2015, Revised 04/04/2015, Published

In this study, two control strategies involving ‘continuous’ and ‘ON/OFF’ operation of the diesel generator in the solar photovoltaic (PV)-wind-diesel-battery hybrid systems are modelled. The main purpose of these developed models is to minimise the hybrid system's operation cost while finding the optimal power flow considering the intermittent solar and wind resources, the battery state of charge and the fluctuating load demand . The non-linearity of the load demand, the non-linearity of the diesel generator fuel consumption curve as well as the battery operation limits have been considered in the development of the models. The simulations have been performed using ‘fmincon’ for the continuous operation and ‘intlinprog’ for the ON/OFF operation strategy implemented in Matlab. These models have been applied to two test examples; the simulation results are analysed and compared with the case where the diesel generator is used alone to supply the given load demand. The results show that using the developed PV-diesel-battery optimal operation control models, significant fuel saving can be achieved compared with the case where the diesel is used alone to supply the same load requirements.

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