Power Balancing Control for Grid Energy Storage System in Photovoltaic Applications—Real Time Digital Simulation Implementation

Sridhar Vavilapalli, Sanjeevikumar Padmanaban, Umashankar Subramaniam and Lucian Mihet-Popa
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Sridhar Vavilapalli: Department of Energy and Power Electronics, School of Electrical Engineering, VIT University, Vellore 632014, India
Sanjeevikumar Padmanaban: Department of Electrical and Electronics Engineering, University of Johannesburg, Auckland, Johannesburg 2006, South Africa
Umashankar Subramaniam: Department of Energy and Power Electronics, School of Electrical Engineering, VIT University, Vellore 632014, India
Lucian Mihet-Popa: Faculty of Engineering, Østfold University College, Kobberslagerstredet 5, 1671 Kråkeroy, Fredrikstad, Norway

Energies, 2017, vol. 10, issue 7, 1-22

Abstract: A grid energy storage system for photo voltaic (PV) applications contains three different power sources i.e., PV array, battery storage system and the grid. It is advisable to isolate these three different sources to ensure the equipment safety. The configuration proposed in this paper provides complete isolation between the three sources. A Power Balancing Control (PBC) method for this configuration is proposed to operate the system in three different modes of operation. Control of a dual active bridge (DAB)-based battery charger which provides a galvanic isolation between batteries and other sources is explained briefly. Various modes of operation of a grid energy storage system are also presented in this paper. Hardware-In-the-Loop (HIL) simulation is carried out to check the performance of the system and the PBC algorithm. A power circuit (comprised of the inverter, dual active bridge based battery charger, grid, PV cell, batteries, contactors, and switches) is simulated and the controller hardware and user interface panel are connected as HIL with the simulated power circuit through Real Time Digital Simulator (RTDS). HIL simulation results are presented to explain the control operation, steady-state performance in different modes of operation and the dynamic response of the system.

Keywords: active power control; battery charging; dual active bridge; energy storage system; hardware-in-the-loop; LCL filter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (17)

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