Research projects in the field of electrical distribution systems are moving to a new philosophy of Smart Grids, where the effort is to use the maximum possible share of power from renewable energy potential. Under this philosophy the emphasis is on energy independence, reliability and safety of operation of energy distribution system. Research in this area leads for example to developing of autonomous local microgrids with the several specific requirements. However, the problem of parameters keeping of quality of electric energy can arise together with increased penetration of distributed generation in microgrids. This problem is caused by decreased short-circuit power of local renewable energy sources, stochastic supply of electric energy from renewable energy sources and operating of active distribution grid in autonomous mode without connection to the external distribution system. General introduction to the power quality evaluation in off-grid power system is introduced in this paper. Initial results from power quality analysis from small off-grids systém is presented in this text too.

 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 [1]. 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.

Please, see pull paper lenght enttitled Power Quality Analysis in Off-Grid Power Platform