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This study presents a modified proportional-resonant (M-PR) control topology for single-stage photovoltaic (PV) system, operating both in grid-connected and stand-alone modes. Dual two-level voltage source inverter fed three-phase openend winding transformer is used to supply the load in this scheme. The M-PR controller is developed for the inner current control loop of the system. The M-PR controller has the ability to track ac current with zero steady-state error. The outer dc-link voltage control loop is developed through the indirect vector control method at synchronously rotating reference frame. The control scheme ensures improved performance of the system at variable solar irradiance and load disturbances. The performance analysis of the dual two-level PV inverter is carried out for different operating conditions. The control scheme is implemented in MATLAB-SIMULINK environment. The theoretical results are verified through experiments in a laboratory prototype. The experimental results show close match with their theoretical counterparts.

One of the deadliest infectious diseases in the world that causes millions of deaths per year is tuberculosis (TB). In this document we present an overview of TB including pathogenesis, diagnosis and recommendations for treatment. We searched PubMed for related articles on TB in preparation for this post. We have also checked for similar reporting and clinical recommendations on the websites of international organisations such as the World Health Organization and the United States Centers for Disease Control and Prevention (CDC). The aim of this paper was to give health staff, policy-makers, patients and the public general education.

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