Research On The Characteristics Of Distributed Generation Admitted By Distribution Network

With the development of new energy sources, the capacity of distributed generation that accessed to the distribution network increases rapidly, the contradiction between the increased of distributed generation capacity and the increased capacity that accepted by distribution network cannot be satisfied locally eliminate, resulting in the effect on the distribution network from distributed generation is increasingly prominent. It is significant for the operation of the distribution network, planning and adaptation character transformation to research on the impact on distribution network of distributed generation, and to identify weak links after distributed generation access to distribution network.This paper based on DigSilent software, build Distributed generation grid simulation model and simulation analysis and Distributed generation networks on distribution grid operation, including security of supply, power quality and operating economy of the three aspects of the distribution network, particularly as follows:on the aspect of electrical safety, Distributed generation simulation analysis when Distributed generation frequently cast back impact on the distribution network outlets voltage and current, and analyze whether distribution generation can be reliably out of operation or not, as well as the formation of unplanned islanding, bring security risks to security of electricity supply and maintenance staff; on the aspect of power quality, simulation and analysis of Distributed generation outlets voltage deviation after access, short Distributed generation voltage fluctuations and frequent impact on the investment return to the distribution network distribution network power quality harmonic injection; on the aspects of the economy, Distributed generation and network simulation analysis of distribution network losses grid system spare, environmental benefits and impact of several aspects of power generation efficiency.This paper analyzes the impact of distributed generation on the distribution network and based on the studies proposed comprehensive evaluation index system that distribution network accept distributed generation, Including three aspects:electrical safety, power quality and economy of the and indicators used in engineering mentioned example, and combine AHP and Fuzzy’s method to evaluate the effect of distribution network admission distributed generation, verify rationality and effectiveness of the proposed indicators. Based on the research of distributed generation influenced on the distribution network study the reform principles and strategy of distribution network accept distributed generation grid and proposed distribution network admission in safety, power quality and economic and other aspects the transformation measures.