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Abstract:The aim of this study is to examine the possibility of using a stand-alone photovoltaic system (SAPVS) for electricity generation in urban areas in Southern Mexico. In Mexico, an urban area is defined as an area where more than 2500 inhabitants live. Due to constant migration from the countryside to the cities, the number of inhabitants of urban localities has been increasing. Global horizontal irradiation (GHI) data were recorded every 10 min during 2014-2016 in Coatzacoalcos in the state of Veracruz located on 18 • 08 09 N and 94 • 27 48 W. In this study, batteries represented 77% of the total cost, 12 PV panels of 310 W could export 5.41 MWh to the grid, and an inverter with an integrated controller and charger was selected, which decreased the initial cost. The city of Coatzacoalcos was chosen because the average annual temperature is 28 • , with an average relative humidity of 75% and an average irradiance of 5.3 kWh/m 2 /day. An emission factor 0.505 tCO 2 /MWh of greenhouse gases (GHG) were obtained, based on the power system, the reduction of net annual GHG would be 11 tCO 2 and a financial revenue of 36.951 × 10 3 $/tCO 2 would be obtained. Financial parameters such as a 36.3% Internal Rate Return (IRR) and 3.4 years payback show the financial viability of this investment. SAPVSs in urban areas in Mexico could be a benefit as long as housing has a high consumption of electricity.

In this paper, a new filtered observer-based IDA-PBC (Interconnection and Damping Assignment-Passivity Based Control) strategy is developed for trajectory tracking of a quadrotor in the presence of disturbances and model uncertainties. The proposed algorithm allows the control of the quadrotor in all its states. It can deal with the noisy output measurements and uncertainties in the translational and rotational dynamics, as unmodeled dynamics inherent to real systems or unknown external signals (exogenous signals). The designed filtered observer estimates the state from noisy output measurements, and it depends only on two design parameters. Numerical simulation tests are carried out to highlight the overall controller approach in a realistic scenario.

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This paper outlines the communication and control systems of a quadrotor type Unmanned Aerial Vehicle. The communication system comprises two different links, one for data and other for video signal, and all integrated by an autopilot module. The data link will be implemented using XBee modules and Mavlink communication protocol. The video transmission system will consist of two separate links which can work together avoiding interferences by using orthogonal polarization each other. It is also given some insights of the onboard software architecture, which is based on the Pixhawk autopilot.

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Nowadays, the research in unmanned aerial vehicles has experimented a large increase, since the technology that compose this kind of aircrafts has been developed in order to achieve many kinds of tasks in several fields. In this paper, it is presented the design criteria of a Quadrotor Unmanned Aerial Vehicle with an uncommon small size and heavy payload carrying combination requirement. It will be performed a selection of the appropriate mechanical structure and its configuration. This study will focus in the structural components selection that will allow fulfilling the requirements of the project such as the energy consumption, the autonomy of the vehicle and the stable flight. The result will be a remote control and automatic aircraft with the appropriate size for both outdoors and indoors tasks.