Harmonic Compensation Using a Series Hybrid Filter in a Centralized AC Microgrid
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Harmonic Compensation Using a Series Hybrid Filter in a Centralized AC Microgrid Hélio Marcos André Antunes1 · Sidelmo Magalhães Silva1 · Danilo Iglesias Brandao1 · Alysson Augusto Pereira Machado1 · Braz de Jesus Cardoso Filho1 Received: 31 August 2017 / Revised: 11 November 2017 / Accepted: 27 December 2017 © Brazilian Society for Automatics–SBA 2018
Abstract The current context of microgrids shows a considerable and unprecedented increase in distributed generation. A microgrid is defined as a network of electricity users composed of distributed generators, loads and storage elements able to operate as a single entity connected or isolated from the main grid. However, the microgrids have usually low short-circuit power capabilities due to the distributed generators composed of electronic converters, which makes the system very susceptible to power quality problems. This article presents an analysis of the series hybrid active filter connected to a centralized AC microgrid, under low power quality issue operation in islanded and grid-connected modes. The paper evaluates the series hybrid filter performance in harmonic compensation and resonance damping capability through simulation analysis. The results show that a series hybrid filter is capable of enhancing the microgrid power quality, requiring a low nominal capacity active filter. Keywords Harmonic filters · Hybrid filters · Microgrids · Passive filters · Power quality
1 Introduction The world has been experiencing a fast change in the production and use of electric power. The traditional electrical system operated transporting large amount of energy produced by huge power plants located far from the consumer. However, with the introduction of distributed generation that scenario has been changing due to the use of energy renewable sources and power production closer to end-users. The distributed generators (DGs) usually have nominal power between 1 kW and 10 MW (Malik 2013; Chen and Mili 2013; Medina et al. 2014). In this context, a new concept appears with the evolution of the distributed generation named as microgrid (MG). According to (Lasseter 2001), a MG is a set of electrical microsources, loads and storage elements controlled as a dispatchable unit (Mahmoud et al. 2014), in which the DGs are commonly based on renewable energy sources (Li and Nejabatkhah 2014). The storage systems are composed of battery
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Hélio Marcos André Antunes [email protected] Graduate Program in Electrical Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
banks, air compressors and flywheel (Parhizi et al. 2015; Araújo et al. 2017). The development of power electronics converters based on voltage source inverters (VSIs) has enabled the interfaces between sources of renewable generation to the grid and besides allows all operation modes of a MG. However, a MG is a weak electrical system with low short-circuit power and the expansion of nonlinear loads and DGs cause voltage and current distortion rates increasing at the point of common coupling (PCC
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