Implementation of Control Strategies for Optimum Utilization of Solar Photovoltaic System with Energy Storage Systems

T Vijay Muni, S V N L Lalitha

Abstract


Solar Photovoltaic (SPV) system primarily based on autonomous system have  advanced as a promising solution to the problem of electrification in areas where the network is now not available. The main challenges in designing such systems are as follows: 1) extraction of maximum power from PV system under fast varying irradiance; 2) extraction of high voltage gain with DC-DC converter; 3) development of efficient power management scheme between SPV and Energy Storage System (ESS). As multiple objectives must be satisfied, existing schemes for autonomous systems require a minimum of three conversion steps, which leads to significant reduction in the reliability and efficiency of the system. The above issues are addressed with different control strategies. For extraction of maximum power a modified non iterative Incremental Conductance MPPT method is developed to generate a fine tuned duty cycle for sudden change in irradiance and regulates that always the intersection point of load line and I-V curve represents Maximum power point (MPP). High voltage gain DC-DC converter generally required for industrial applications and can be achieved by high duty ratio which cause reverse recovery problem and voltage stress on power switches. To overcome this problem a soft switch interleaved boost converter (SSIBC) is proposed which is operate on zero current switching to turn ON active switches and it can achieve high voltage gain for lower duty ratios. Lead acid battery is an energy storage device which is used in SPV systems. Finally to achieve power management, variable DC bus voltage based algorithm is developed with super capacitor (SC) and battery (BAT) as ESS. The capability of the proposed control strategies is tested and validated under various scenarios

Keywords


Battery protection; high voltage gain DC-DC converter; Stand alone Solar PV system; Energy storage system, Power management scheme.

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v10i2.10565.g7943

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