Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: MAF, OCF, Phase-Locked Loop, SOGIPLL

Resumo
Este artigo propõe um procedimento de filtragem linear para aprimorar o desempenho de um algoritmo de PLL (Phase-Locked-Loop), baseado na estrutura de um integrador generalizado de segunda ordem (SOGI), utilizando um filtro de Fourier de um ciclo (OCF) para filtrar as tensões ab estacionárias geradas diretamente pela estrutura do SOGI. Além disso, faz-se uma comparação entre o SOGI convencional e também com um filtro de média móvel (MAF), sendo que este filtro é aplicado nas tensões dq síncronas produzidas pela transformação alfa/beta para dq na saída da estrutura SOGI. As comparações são realizadas em bancada experimental com emprego de sinais afetados por diferentes distorções harmônicas e com tensões de afundamento semelhantes às obtidas em redes de energia sob condições de falhas. Os resultados das comparações mostram que as duas abordagens, OCF e MAF, melhoram a dinâmica do SOGIPLL convencional para rastrear mudanças abruptas de frequência. Embora a proposta com emprego do OCF apresente um desempenho superior em algumas situações, é também mostrado que as oscilações apresentadas na estimativa de frequência pelo SOGI-PLL para sinais harmonicamente distorcidos são extinguidas.

Title: Enhanced SOGI-PLL by one-cycle Fourier algorithm

Keywords: MAF, OCF, Phase-Locked Loop, SOGIPLL

Abstract
This article proposes a linear filtering procedure to improve the performance of a PLL algorithm, based on the structure of a generalized second order integrator (SOGI), using a one-cycle Fourier filter (OCF) to filter stationary voltages ab generated directly by a SOGI structure. In addition, a comparison is made between conventional SOGI and also with a moving average filter (MAF), with this filter applied to the synchronous dq voltages produced by the alpha/beta to dq transformation at the output of the SOGI structure. The comparisons are made with signals affected by different harmonic distortions and with sinking voltages similar to those obtained in power networks under fault conditions. The results of the comparisons show that the two approaches, OCF and MAF, improve the dynamics of conventional SOGI-PLL to track abrupt changes in frequency. Although the proposal with the use of OCF presents a superior performance in some situations. It is also shown that the oscillations shown in the frequency estimated by SOGI-PLL for harmonically distorted signals are extinguished.

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