A Method of Black-start and Island Operation for Đăkrơsa Hydroelectric Power Plant Using Fuzzy Logic

Black Start is the procedure of restoring power by using generators in the event of a total or partial shutdown of the national electricity transmission system. In this paper, the solution to black start and island operation is proposed for the Dakrosa hydroelectric power plant in Kontum province. Firstly, the mathematical model of Đăkrơsa hydropower plant is developed as the basis for the analysis and design of the solution. Secondly,based on this mathematical model, PID and fuzzy control algorithms are proposed to black start and operate in island mode to supply a specified load. Thirdly, to verify the feasibility and the effectiveness of the proposed algorithms, simulations have been carried out on Matlab-Simulink software. The results have shown better mobilization power and frequency stability in case of using fuzzy logic combined with traditional PID algorithm

A Study on Thermal Properties of Epoxy Materials in A Dry-type Transformer

Dry-type transformers play an important role and are used everywhere in our life, especially places where fire safety is required such as pits, civil and industrial projects. Thus, study of thermal problems in the dry-type transformer to find out the local hot spot in windings is always a topical topic that domestic and foreign researchers are very concerned. In parallel to the experimental measurement, this issue can be solved by simulating with the input parameters being the thermal conductivity λ, thermal diffusivity  and specific heat cp. Recently, there are several studies on heat coefficients of the epoxy material, but still getting several errors when applying in Vietnam. Therefore, in this article, authors have researched to produce a device for measuring the thermal coefficients of the epoxy material in the dry-type transformer

Nghiên cứu ứng dụng công nghệ sinh học chế tạo kháng nguyên và kháng huyết thanh dùng chẩn đoán nhanh bệnh virut của gia súc gia cầm : [Kết quả nghiên cứu Khoa học]

45 tr

Nghiên cứu, lí luận, phê bình văn học ở Nam Bộ thời kỳ 1865-1954

827 tr. ; 24 cm