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SUMMARYIn this paper, applications of phasor measurements to the Brazilian interconnected power system (BIPS) are presented. Two prototypes, the low voltage phasor measurement system (LVPMS), with phasor measurement units (PMUs) installed in nine universities throughout Brazil and the high voltage phasor measurement system (HVPMS), with PMUs installed in four substations in a transmission utility in Southern Brazil, are the first installations in the country. These experimental prototypes have been a rich source of experience on the use of syncronized phasor measurements. Line parameter estimation, detection of oscillation modes, disturbance analysis, and system wide model validation have been the main applications. The LVPMS measurements are acquired at outlet voltage while the HVPMS measurements are acquired at 525 kV substations. The monitoring and analysis of several events in the BIPS have shown that both systems can provide relevant and comparable information on the BIPS dynamics.

In this paper, a design method based on nonsmooth, nonconvex optimization is applied to the design of power system controllers for improving small-signal stability. The design method was developed to solve the problem of the design of low order controllers using output feedback and incorporating robustness constraints. The method is applied to the problem of stabilization of a test system with only one power system stabilizer and to the design of a centralized controller, part of a two-level hierarchical control.

This paper focus on the influence of filter dynamics on the performance and stability of current control loops of threephase, pulse-width modulation (PWM) voltage source inverters (VSIs) in grid-connected operating mode. The analysis considers the application of those devices in microgrids. Based on a detailed state-space model of VSIs and their companion filters, enhanced controller design techniques are applied in order to prevent the drawbacks of conventional microgrid control strategies. The effectiveness of the proposed control strategy is verified via computer simulations.

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