This paper tries to improve the power quality and to contribute with additional active power for isolated power systems. These systems either have their own generation or are connected to the network but they are always far away from great power generation centres. The proposed methodology consists of integrating an active power filter with a photovoltaic (PV) generation source, which use the same inverter for connecting to the network. Through this integration a double aim is fulfilled: on the one hand the power quality is improved through the compensation capacity of active power filters, and on the other an extra contribution of active power is supplied by PV system. The power system operation is analysed through the instantaneous power theory and simulated using MATLABMMULINK environment. This is a feasible solution for the growth planning of isolated systems, while the operation and maintenance costs as well as energy losses can be reduced.Index Terms-Active power filter, isolated power systems, network compensation, photovoltaic generation.

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This paper investigates the effectiveness of the “Perturbation and Observation” (P&O) method and “Incremental Conductance” (IncCond) method through simulations carried out by using SimPowerSystems of MATLAB/Simulink®. Both the steady-state and transient characteristics of each control algorithm are fully analyzed and compared by using a proposed performance index. Finally, a new MPPT control algorithm based on an enhanced incremental conductance method is proposed in order to improve the efficiency of the PV power generation system at different climatic and load conditions. An adaptive duty cycle perturbation step size is made dependent on the sensitivity of the PV array power to the previous perturbation in order to obtain a fast dynamic response and accurate tracking of the MPP. Digital simulations and experimental results demonstrate the superior performance of the proposed technique.

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