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This paper presents a technique for synchronizing synchronous generators without speed control. The proposed construction is under development in a research project which aims to control auxiliary synchronous generators in a hydroelectric power unit. An UPFC device is used to achieve the synchronism of the synchronous generator with the power system. Simulation with different phases angles and voltage...
With the evolution observed nowadays in power electronics systems, frequency converters are increasingly used in the grid. However, due to switching techniques employed, the harmonic distortion of the resulting signals became an important parameter to be considered in the design of such converters. For this reason, special attention has been given to the techniques of pulse width modulation (PWM)...
This paper presents the initial results of a research project that aims to develop a control system for active power regulation in synchronous auxiliary generators connected to hydraulic generation units. In this sense, the developed system is based on the compensation of the inductive impedance of the auxiliary generator using TCSC switched by IGBT0s. The control of IGBT0s firing angle is achieved...
This paper presents an innovative proposal for a SCADA system platform, integrating oscillographic capabilities to the set of functions found in standard supervisory and control systems. The proposed SCADA system was developed using C++ language, targeted to x86-64/Windows 7 processing platforms, and is based on multithreading programming. The resulting system has a low implementation cost. The hardware...
This paper proposes the design and use of a device which will fix the angle of an ultrasonic transducer used in the acquisition of Ultrasonic Doppler signals during coronary graft surgery. The aim of this device is to act as a tool which will guide the surgeon to position the ultrasonic transducer in the correct angle and plane which is essential on the calculation of the blood flow through the implanted...
The simulation and construction of a novel ultrasonic transducer for medical application are presented. The process starts with the simulation, using the necessary components involved in the construction of the transducer. The Finite Element Method (FEM) was used as a software tool in the simulation. Once the simulation was ready the transducer was constructed. Some important aspects in the construction...
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