Abstract
The presented work demonstrates a photovoltaic (PV) array generation unit, with the capability to operate reliably in weak grid conditions, while maintaining distortion-free and balanced grid currents. The grid is isolated from the fluctuations in the PV array power, and the load demand, using the controlled charging/discharging operation of a battery energy storage (BES). The independent control of the DC link is achieved by the bi-directional DC-DC converter (BDC), which controls the BES power flow. An adaptive update of the DC link voltage is implemented, and it is updated with the variations in the grid voltages. The system also supports the neutral current demanded by the local loads, and results in grid neutral current suppression. The PV array is undisturbed by changing loads or grid conditions, due to its integration by a boost converter, which also ensures maximum power point operation. The grid power is adjusted on the basis of feed-in tariffs at that time, thereby helping to flatten the distribution load demand, and yielding economic benefits. The system behavior at various adverse conditions, is analyzed, to confirm the claimed benefits.
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