Abstract
In the recent years, with development of power electronics and semiconductor technologies, grid-connected photovoltaic systems have gained a high significance. This systems can be classified to single-stage and two-stage power conversion systems. In the single-stage systems, the DC/DC converter is removed and efficiency is improved as well as cost reduction of the system. However, both of maximum power point tracking and DC/AC conversion must be implemented by inverter in this systems. Therefore, applying the appropriate control method for inverter is so important. Consequently, firstly, this paper proposes a modified MPP tracking algorithm based on the power perturbation instead of voltage or current perturbation to speed up the dynamic response of the proposed control system. In addition, considering several benefits of sliding mode control in control of non-linear systems, an improved direct power control method based on sliding mode control is also proposed to be used to control the injected active and reactive powers to the grid. Since power control is the main goal of grid connected PV systems, removing any internal control loops or interface variables, the proposed control system shows fast dynamic response with satisfied steady state performance.
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