New control paradigm for integration of photovoltaic energy sources with utility network

The employment of an inverter to integrate a distributed generation system to the utility network is well known. In such a context, there is an increasing interest in developing an appropriate control strategy to derive a current with less distortion from the inverter. In this paper, a new current controller for inverters of this kind has been proposed. The proposed technique combines the benefits of a proportional–integral controller and a hysteresis limiter. The paper presents the development of such a controller and its structure. Inverter-output current waveforms of the proposed scheme are compared with that of a hysteresis alone and average current mode controllers. A better harmonic elimination and current tracking performance of the proposed controller is thereby established. Filter responses have also been compared to establish the superiority of the proposed approach.