PriMove Infrastructure Development Consultants (India)

Abstract Diagrid structures recently have evolved as novel solutions for the design of tall buildings with unique geometrical layouts. The aesthetic value and flexibility in accommodating distinctiv...

This study proposes the detailed modelling of a novel automatic centralised micro‐grid controller (ACMC)‐based hybrid AC/low‐voltage DC (LVDC) micro‐grid network, capable of off‐grid and on‐grid operation of the system with a coordinated control. The micro‐grid is designed to work majorly with renewable power sources. This hybrid micro‐grid is capable of interconnecting very large AC and LVDC networks, using a bi‐directional AC/DC/AC converter. The AC and the LVDC networks consist of different feeders with loads connected at various voltages. The ACMC design proposed is responsible for controlling the real(P) and reactive(Q) power from the sources based on load requirement and voltage control of the LVDC network. It enables the system to have a plug and play feature. The proposed ACMC has been implemented on a test system consisting of AC and LVDC radial distribution networks designed, with a bi‐directional converter. A doubly fed induction generator‐based wind turbine and solar photovoltaic array with maximum power point tracking have been used as the sources. The system has been simulated in Simulink. The results show the ACMC successfully performs the four quadrant operation of P,Q in the system for various system conditions.

This paper represents a method of analysis of simple networks with the help of MATLAB-SIMULINK models and microcontroller based hardware. The mathematical foundation of this method is an algorithm based on orthogonal Hybrid Function.

Higher capacities of power plants together with increased awareness on environmental considerations have led to taller height of stacks. It is seen that strong wind can result in falling of stacks. So aerodynamic considerations of stacks is very important in order to save the falling of stacks. One stack is not enough in industries and power sectors and two or three stacks are required for proper operation of the unit. It is very important to arrange the stacks in proper way to resist their downfall. The present experimental study concentrates on the mutual effect of three nearby stacks on each other at three different arrangements, viz. linear, side-by-side and triangular. The experiments find out the directions of resultant forces acting on the stacks in different configurations so that proper arrangement of supports can be made with respect to the wind directionality obtained from local meteorological data. The other conclusions that could be drawn from these experiments are: (a) the second stack in along wind linear arrangement experiences the most drag and hence is much more susceptible to falling down with high gusts, whereas the last stack experiences the least drag and hence less prone to the downfall. (b) In side-by-side arrangement, although the middle one experiences maximum drag, the lift forces on the right and left stacks are far greater and hence the resultant force on them are much more in comparison to the middle one. (c) In the triangular arrangement also, the lift force being so pronounced on the right and left corner stacks, the resultant force on them will be much higher in comparison to that on the front stack sitting at the apex of the triangle. Thus, this study is important in studying the effect of wind force on three stacks in different arrangements and is very helpful in placing the supports in proper places in order to avoid failing of stack-like structures due to wind.