Research On Islanding Detection Of Distributed Generation System

The global energy crisis and pollution phenomenon causes clean energy distributed generationtechnology to develop, and will become direction of the development of the electric power industryin a long period time.Grid-connected inverter distributed generation system as anenvironment-friendly and flexible power generation applications are rapidly be applied. However,distributed generation systems will bring significant changes to the structure and operation of theentire power system in the application process. How to ensure that the complexity modern powersyetem keep safe and stable and reliable operation.islanding and anti-islanding strategy is the keyissues and therefore become an important research direction of distributed generation technologies.In the paper, elaborated the concept of the distributed generation and the cause of the islanding,generalied islanding detection of international testing standards and testing circuit, summarized andevaluated the many domestic and foreign anti-islanding technologies in the past decade.Among themethods frequency-drift techniques are best choice.Comprehensive study and select the best suitednon-detection zone evaluate coordinate system. Deduced frequency-drift method in thenon-detection zone evaluate coordinate system and improve the frequency-drift algorithm to reducethe size of the non-detection zone.Also introduced the the relationship between the islanding detection algorithm parameters andthe harmonic.Proposed the islanding detection with less distortion on inverter current.Simulationand experiments are developed to validate the proposal.