A Power Management Strategy for Hybrid Photovoltaic Diesel System with Battery Storage

A Power Management Strategy for Hybrid Photovoltaic Diesel System with Battery Storage

Taoufik Ben Mohamed el Harry Mhamdi (Higher Institute of Technological Studies, Kasserine, Tunisia) and Sbita Lassad (Department of Electrical and Control Engineering, National Engineering School of Gabes, Gabes, Tunisia)
Copyright: © 2016 |Pages: 13
DOI: 10.4018/IJEOE.2016010103
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This paper proposes a DC-AC-linked hybrid diesel/photovoltaic (PV)/battery storage system for stand-alone applications. PV is the primary power source. A diesel engine is used as a backup and a battery as storage device. An overall power management strategy is designed to manage power flows among the different energy sources and the storage unit. A configuration of diesel-engine generator and photovoltaic hybrid systems is evaluated based on technical constraints. A sizing of different component is established. A simulation model for the hybrid energy system has been developed. The system performance under different scenarios has been verified by carrying out studies using a load demand profile.
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2. Hybrid System Configuration

Related to works published in Mhamdi and Sbita (2013), the proposed hybrid system considered in this work is shown in Figure 1. In order to convert the mechanical power to electrical power required by the load, the rotor of the diesel motor is coupled to a self-excited induction generator (SEIG). The three phase full bridge diode rectifier which is connected to the stator of the SEIG is used to rectify the generated terminal voltage. The main rule of the used LCLC filter is to obtain a smooth DC voltage by suppressing the voltage fluctuation. The obtained DC voltage is used to feed a DC or AC load. In other way, the load can be fed also by a DC voltage provided only by the PV panel through the fuzzy controlled PWM boost converter. The decision about the choice between the three ways is realized by the supervisor used in this hybrid configuration. The system is autonomous, the load is totally met by the system at all times. Such a constraint still permits a limited number of possible system configurations. From solar radiation data and from assumed daily load profile, the system behavior can be simulated and a system meeting the constraints can be sized. Certain physical and technical constraints are used to reduce the system parameters to a realistic domain (Muselli et al., 1999).

Figure 1.

The proposed hybrid system configuration


3. Hybrid System Sizing

3.1. Consumption Estimation

The optimal sizing of this renewable energy sources plays a significant role for the energy reliability of the system. The first step to size the sources and the other devices is to evaluate the load profile (Lagorse et al., 2008). Based on statistics published by the world banque. The average consumption of a rural zone citizen is IJEOE.2016010103.m01 which represents an annual energy consumption of 1314 kWh. This consumption evolution is based on a domestic consumption in Tunisia.

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