Abstract
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 system is presented in this text too.
Highlights
Power quality can be explained as the fitness of consumed electrical power to user appliances and devices
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
Power quality analyses for gridconnected photovoltaic plants were introduced in various papers [5], [6], [7]; general PQ issues associated with grid-connected PV systems are discussed, for example, in [3], [10]
Summary
Power quality can be explained as the fitness of consumed electrical power to user appliances and devices. Good power quality allows electrical systems to function in their intended manner without significant loss of performance or life. 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. With the RES installation for off-grid power system supply, their impact on the power quality should be significant. Voltage fluctuation caused by variability of photovoltaic (PV) and wind power generation is one of the most important issues. Another significant problem is harmonic distortion, since both types of generation plants are usually connected to the power system through inverters. Wiring diagram of described off-grid power system together with individual system c 2014 ADVANCES IN ELECTRICAL AND ELECTRONIC ENGINEERING. More detailed characterization and overall off-grid power system description is widely introduced in [1], [2]
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