This paper introduces the initial evaluation of power quality (PQ) of off-grid power system, which was built as research platform for renewable energy sources (RES) testing. Off-grid system was sized as a model for usual residential supply . The main idea of this concept is to find links or relations between environmental (solar irradiance and wind speed) and PQ variables associated with solar and wind energy. Based on these links prediction of PQ for off-grid power system will be introduced to optimizing PQ level in off-grid power system. In particular, this contribution concentrates on the relationships between environmental (solar irradiance and wind speed) and power quality (PQ) quantities. The paper is organized in four main sections. Section 2 provides a brief introduction to issues of power quality in general and problems specific to RES power quality. It also brings an overview of relevant technical standards. Section 3 provides a review of work on the PQ evaluation related to off-grid power systems. Section 4 describes the overall structure of off-grid power system and also describes individual components. Section 5 describes the PQ evaluation and some of the partial results made from this data. Conclusions are presented in Section 6.
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