Autonomous operation of a hybrid microgrid using centralized and distributed control

Wed, 27 Apr 2016 00:00:00 +0000

This work is based on the master thesis proposal entitled “Autonomous operation of a hybrid microgrid using centralized and distributed control”. The selected microgrid architecture is composed of two Direct Current distribution buses and allows both grids connected and islanded operation. In Fig. 1, from left to right, the first bus is an Extra Low Voltage Direct Current (ELVDC) that operates to 48VDC, the second bus is Low Voltage Direct Current (LVDC) that operates to 240 VDC. Each bus interconnects several units that instantaneously supply, store or consume energy. In fact, each connected unit has a first level controller, which provides regulation of inner variables such as current and power. Besides, the development of any hybrid microgrid should guarantee the energy balance and regulation of the constant voltage in the buses, with the purpose of synchronizing each of the interconnected units. The propose includes a cooperative master-slave control where the control action changes between Pv, Pbatt, and Pilc. Each unit has different types of operation modes. And, the cooperative control will choose which unit is the master control. For the transition between the two units, cooperative control will be regulated with them at the same time using the logistic function as a transition reference.

See the poster Cooperative master–slave control for a microgrid ELVDC bus

Modelling, identification and control of a quadcopter

Wed, 27 Apr 2016 00:00:00 +0000

Currently, the use of Drones, in precision agriculture, is of vital importance for the transport of agricultural materials, crop monitoring, cartographic mapping in relief, among others. Of the union between D + TEC group Unibague and Fedearroz borned a project about to research in precision agriculture. The aim is detect causes stress in rice. This can be determined in using high resolution, multispectral and thermographic cameras.

Quadcopter, also known as quadrotor, is a helicopter with four rotors. The rotors are directed upwards and they are placed in a square formation with equal distance from the center of mass of the quadcopter. The quadcopter is controlled by adjusting the angular velocities of the rotors which are spun by electric motors. Quadcopter is a typical design for small unmanned aerial vehicles (UAV) because of the simple structure.

Quadcopter has received considerable attention from researchers as the complex phenomena of the quadcopter has generated several areas of interest. The basic dynamical model of the quadcopter is the starting point for all of the studies but more complex aerodynamic properties has been introduced as well, like the turbulence, fails, etc. Different control methods has been researched, including PID controllers, LQR, predictive.

This work show, the control in pitch, roll and yaw of non comercial quadcopter, using a raspberry pi and a shield Navio2, the code was write in Python, C++ and Assembler. In fact The control methods will showed PID, LQR and one PID variant.

PID | Diego S. D'Antonio

Autonomous operation of a hybrid microgrid using centralized and distributed control

Modelling, identification and control of a quadcopter