A influência política na gestão das empresas estatais à luz do direito fundamental à boa administração e da governança corporativa e pública

This study is dedicated to explain the extent to which political influence in the management of state-owned enterprises can be considered legitimate in the light of the fundamental right to good governance and corporate and public governance, for which was undertaken bibliographical and documentary research guided by the deductive method of work, in which were investigated and presented concepts and issues relating to the State, Government, politics, Public Administration, constitutional principles of Public Administration, the fundamental right to good administration, corporate and public governance and state enterprises. Based on the assumptions found in the works and consulted laws it was possible to conclude that the political influence in state-owned enterprises management can be considered legitimate in the light of the fundamental right to good governance if it promotes the public interest and the public purposes achievement, effectively, efficiently and if it preserves the citizens' rights and the principles and rules that make up the legal framework for public administration; and can be considered legitimate in the light of corporate and public governance to the extent that, in a transparent manner and according to the relevant rules, it seeks not the private benefit of politicians, but to promote the public interest or, in other words, the increase of public value produced by them, while protecting and guaranteeing the rights of its stakeholders and shareholders.

Projeto, implementação e análise de um conversor CC-CC de alto ganho e alto rendimento para aplicações fotovoltaicas

In recent years the photovoltaic generation has had greater insertion in the energy mix of the most developed countries, growing at annual rates of over 30%. The pressure for the reduction of pollutant emissions, diversification of the energy mix and the drop in prices are the main factors driving this growth. Grid tied systems plays an important role in alleviating the energy crisis and diversification of energy sources. Among the grid tied systems, building integrated photovoltaic systems suffers from partial shading of the photovoltaic modules and consequently the energy yield is reduced. In such cases, classical forms of modules connection do not produce good results and new techniques have been developed to increase the amount of energy produced by a set of modules. In the parallel connection technique of photovoltaic modules, a high voltage gain DC-DC converter is required, which is relatively complex to build with high efficiency. The current-fed isolated converters explored in this work have some desirable characteristics for this type of application, such as: low input current ripple and input voltage ripple, high voltage gain, galvanic isolation, feature high power capacity and it achieve soft switching in a wide operating range. This study presents contributions to the study of a high gain and high efficiency DC-DC converter for use in a parallel system of photovoltaic generation, being possible the use in a microinverter or with central inverter. The main contributions of this work are: analysis of the active clamping circuit operation proposing that the clamp capacitor connection must be done on the negative node of the power supply to reduce the input current ripple and thus reduce the filter requirements; use of a voltage doubler in the output rectifier to reduce the number of components and to extend the gain of the converter; detailed study of the converter components in order to raise the efficiency; obtaining the AC equivalent model and control system design. As a result, a DC-DC converter with high gain, high efficiency and without electrolytic capacitors in the power stage was developed. In the final part of this work the DC-DC converter operation connected to an inverter is presented. Besides, the DC bus controller is designed and are implemented two maximum power point tracking algorithms. Experimental results of full system operation connected to an emulator and subsequently to a real photovoltaic module are also given.