Implementação e testes de campo de um ESP digital

Abstract

This work presents the development and implementation as well as the results of field tests of a power system stabilizer (PSS) designed with digital control method for damping electromechanical modes of oscillation observed for signs of electrical power measured in a generating unit of 350 MVA of Tucuruí power plant. It is presented and applied the methodology of identifying linear parametric models such as auto regressive with exogenous inputs (ARX) for estimation of models with the ability to capture the relevant information (natural frequency and damping) of dominant electromechanical modes of the system. In possession of ARX parametric model is done then the synthesis of digital damper control law for the ESP, using the technique of pole displacement of the closed loop transfer function. For the synthesis of digital control law, we used a canonical structure type RST. For the field tests, the control law digital ESP buffer was coded in C language and embedded in a hardware prototype of which is based on model DSPIC 30F3014 microcontroller, which incorporates a large number of peripherals for data acquisition and communication. In order to evaluate the performance of the digital PSS developed, experimental tests were performed in a generating unit of 350 MVA power house number 1 from Tucuruí power plant. The stabilizer acts carried out by adjusting the reference voltage regulator automatic voltage of the respective generating unit in accordance with the oscillations observed by measuring the electrical power generator stator. The results of field tests showed an excellent performance of ESP digital damping of electromechanical mode of natural frequency of approximately 1.7 Hz, observed in the field trial.