Optimal connection of wind turbines to distribution grid to minimize power loss

This research aims to connect wind turbines to a distribution grid to minimize the power loss and to satisfy the grid’s normal operating condition. The proposed algorithm will determine optimal positions, optimal operation mode and wind turbine type. We must choose the best operation mode from available modes including the constant power factor mode and the constant voltage mode. According to the optimal operation mode, we decide the optimal setting data of wind turbine. This algorithm is coded in MATLAB software and implemented to IEEE 33-buses distribution grid. Noted that in this research, we tested two cases including the original IEEE 33-buses grid and its modification where the power system connected to this grid at multi-position. Results indicated that the proposed algorithm could determine the number of wind turbines, position, optimal operation mode, wind turbine type and the priority order of wind turbine installation to minimize power loss. Moreover, results were also compared to that of other algorithms

Evaluation of exponential moving average application to smooth the power output of wind turbine with different control modes

This paper focused on evaluating the application of exponential moving average method into wind turbine to smooth its power output without an energy storage system or an anemometer. Wind turbine control modes including active power control mode and rotor speed control mode are considered. For each control mode, two positions of the Exponential Moving Average method in controller were compared to choose the best position. Additionally, the impact of smoothing factor on wind turbine performance was also considered to determine a reasonable value of the smoothing factor for each control mode. Simulation results in MATLAB/Simulink indicated that, for wind turbine using rotor speed control mode, the Exponential Moving Average method should be applied to reduce the variation of actual rotor speed signal while for wind turbine with the power control mode, it should be used to smooth reference power signal. From the performance of wind turbine with different smoothing factor values, we can suggest that the smoothing factor value should be set at 0.5 and 0.4 for the power control mode and the rotor speed control mode, respectively

Chafe’s Semantic Structure Processes Versus Halliday’s Systemic Functional Grammar Processes

Processes are seen as a language phenomenon involving the participant of various language elements realized by verbals, nominal groups or adverbials. How these elements occur in the processes depends on linguists’ concepts of processes. The paper aims to consider Chafe’s processes and Halliday’s Systemic Functional Grammar processes to see what similarities and differences are. The study was conducted with qualitative methods in order to analyse materials and analyse the data collected. The data include samples extracted from four literary works in English which are The Man of Property, The Old Man and the Sea, the Call of the Wild and the Moon and Sixpence. The findings can point out some differences and similarities of processes by Chafe and Halliday. At the same time, the results will help those who pay much attention to this language phenomenon have a deeper understanding in order to equip themselves with background knowledge of language learning and research