Current Issue : July - September Volume : 2020 Issue Number : 3 Articles : 5 Articles
A novel and robust active disturbance rejection control (ADRC) strategy for variable speed wind turbine systems using a doubly\nfed induction generator (DFIG) is presented in this paper. The DFIG is directly connected to the main utility grid by stator, and its\nrotor is connected through a back-to-back three phase power converter (AC/DC/AC).............................
A solar updraft tower is one of the wind power generation plants which utilizes solar energy. The purpose of this study was to\nascertain whether the tower was also able to utilize crosswind energy. Wind tunnel experiments and numerical simulations were\nconducted simulating the crosswind. The results showed that suctioned updraft speed in the tower was proportional to the\ncrosswind speed, and its conversion rate depended on the tower configuration. A diffuser-shaped tower with a vortex generator\nachieved to produce the updraft whose speed exceeded the crosswind speed. It was due to the low pressure created by the vortex\natop the tower and to the diffuser effect. The crosswind utilization enables the simple power generation device to generate\nelectricity during the night, and the hybrid utilization of renewable energies contributes to the increasing wind energy market....
The integration of variable-speed pumped storage unit (VS-PSU) guarantees an efficient peak regulation and frequency\nmodulation of the power grid............................
Wind power generation has been widely deployed in the modern power system due to the issues of energy crisis and environment\npollution. Meanwhile, the microgrid is gradually regarded as a feasible way to connect and accommodate the distributed wind\npower generations. Recently, more research studies also focus on incorporating various energy systems, for example, heat and gas\ninto the microgrid in terms of satisfying different types of load demands. However, the uncertainty of wind power significantly\nimpacts the economy of the integrated power-heat-gas microgrid.........................
Damage of the cladding structures usually occurs from the wind-sensitive part, which can cause the damaged conditions to\nobviously vary from different areas especially on a large roof surface. It is necessary to design optimization due to the difference of\nwind loads by defining more accurate wind pressure coefficient (WPC) zones according to the wind vulnerability analysis. The\nexisting wind pressure coefficient zoning methods (WPCZM) have successfully been used to characterize the simple roof shapes.\nBut the solutions for the complex and irregular roof shapes generally rely on the empirical judgment which is defective to the wind\nloading analysis...............................
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