Grid interactive photovoltaic (PV) system.

What is it about?

This work investigates a grid tied PV system that enhances the grid current quality while the nonlinear load is injected at the point of interconnection. The harvested PV power is utilized to feed the load and the remaining power is fed to the utility grid. This mitigates the requirement of additional active filter to eliminate harmonics from the grid current. The control algorithm used is robust against grid frequency drift and grid voltage swell and sag.

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Why is it important?

The voltage source converter (VSC) acts as a distribution static compensator (DSTATCOM) when generation from the PV array is unavailable, besides injecting active power in the distribution network, and reducing reactive power loading on the utility network by mitigating harmonics in presence of generation from the PV array. Thus, the VSC utility is enhanced. This PV system performance is robust against the weak utility grid parameter variation and at load perturbation. The presented algorithm improves transient response at dynamic loading and varying irradiance. The incorporated control algorithm rejects lower order harmonics too unlike the conventional quadrature signal generators; thus, this control algorithm extracts accurate fundamental frequency orthogonal components of load current.