T.Rengaraj, Ms.S.Soniya
A single-phase grid-connected photovoltaic (PV) inverter topology consisting of a boost section, a low-voltage single-phase inverter with an inductive filter, and a step-up transformer interfacing the grid is considered. An adaptive harmonic compensation technique and its design are proposed for the lower order harmonic compensation. The inverter current controls that mitigates the lower order harmonics. In addition, a proportional-resonant-integral (PRI) controller and its design are also proposed. This controller eliminates the dc component in the control system, which introduces even harmonics in the grid current. The switches are all rated for low voltage which reduces the cost and lesser component count in the system improves the overall reliability. The design of the inverter current control to achieve a good attenuation of the lower order harmonics. This method estimates a particular harmonic in the grid current using a least-mean-square (LMS) adaptive filter and generates a harmonic voltage reference using a proportional controller. Index Terms: Adaptive filters, harmonic distortion, inverters, solar energy.
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