This document describes a MATLAB/Simulink simulation of a single-phase solar PV system with battery storage and the ability to exchange power with the electric grid. The system uses three control approaches - grid current control, point of common coupling voltage control, and intentional islanding with resynchronization - depending on grid availability. Simulation results are presented showing the system performance under various conditions like grid isolation, reconnection, and changing solar insolation. The system is able to generate maximum power, feed power to the grid and load, and charge/discharge the battery. It can also resynchronize with the grid within five cycles of any phase difference, making it suitable for residential applications.

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Single-phase solar PV system with battery and exchange of
power in grid-connected and standalone modes
ABSTRACT:
A grid tied photovoltaic (PV) power conversion topology is presented in this study with a novel
scheme of resynchronization to the grid. This scheme serves the purpose of supplying continuous
power to the load along with feeding power to the grid. The control approach helps in mitigation
of harmonics and improving the power quality while extracting the optimum power from the PV
array. Depending on the availability of grid voltage, the proposed configuration is controlled
using three approaches, defined as grid current control, Point of Common Coupling (PCC)
voltage control and intentional islanding with re-synchronisation. A simple proportional integral
controller manages the grid current, load voltage, battery current and DC Direct Current (DC)
link voltage within these modes. Moreover, a control scheme for quick and smooth transitions
among the modes is described. The robustness of the system under erratic behaviour of solar
insolation, load power and disturbances in grid supply makes it a suitable choice for a residential
application. The control, design and simulation results are presented to
demonstrate the satisfactory operation of the proposed system.
SOFTWARE: MATLAB/SIMULINK

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CIRCUIT DIAGRAM:
Fig. 1 Proposed system topology

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EXPECTED SIMULATION RESULTS:
Fig. 2 Performance of the system under grid isolation
(a) GCC to PVC, (b) Harmonic spectrum of grid current (ig), (c) Harmonic spectrum of load voltage (vL)

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Fig. 3 Performance of the system under grid reconnection
(a) Mode change from PVC to IIRS, (b) Grid voltage (vg) vs. load voltage (vL) during
intentional islanding

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Fig. 4 Performance of the system for insolation change from 1000 W/m2
to 500/m2

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CONCLUSION:
The proposed scheme has combined the solar PV power generating unit to single-phase grid with
a unique feature of resynchronization of grid to the system after overcoming the grid failures.
The ability of the system to generate maximum power for varying insolation, feeding active
power to the grid as well as load and store/extract power to/from the battery has been validated
by the dynamic performance. This helps in increasing the efficiency of the system. The scheme
has utilised minimum number of switches resulting in lower switching losses. The VSC has the
ability to diminish the switching harmonics in grid current and load voltages resulting in <5%
THD as demanded by the IEEE 519 standard. The system has ability to re-synchronise with the
grid within five cycles of grid voltage for any phase difference. This helps in achieving the fast
time response of the system, thus making it a suitable choice for residential applications. The
obtained results have authenticated the robustness and feasibility of the proposed system under
various disturbances.
REFERENCES:
[1] Zheng, H., Li, S., Bao, K., et al.: ‘Comparative study of maximum power point tracking
control strategies for solar PV systems’. IEEE Conf. on Transmission, Distribution and
Exposition, May 2012, pp. 1–8
[2] Weihang, Y., Jianhui, W., Wenzhong, G., et al.: ‘A MPPT algorithm based on extremum
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2015, pp. 7939–7944
[3] Zhang, Q., Hu, C., Chen, L., et al.: ‘A center point iteration MPPT method with application
on the frequency-modulated LLC microinverter’, IEEE Trans. Power Electron., 2014, 29, (3),
pp. 1262–1274

7. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
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[4] Li, Q., Wolfs, P.: ‘A review of the single phase photovoltaic module integrated converter
topologies with three different DC link configurations’, IEEE Trans. Power Electron., 2008, 23,
(3), pp. 1320–1333
[5] Gloire, N., Lei, D., Xiaozhong, L., et al.: ‘Single phase grid-connected PV inverter applying
a boost coupled inductor’. IEEE Conf. on Transportation Electrification (ITEC Asia-Pacific),
August–September 2014, pp. 1–5