Performance Analysis and Technical Feasibility of an iUPQC in Industrial Grids

Using a dual compensation strategy, this study proposes the analysis and implementation of active power quality conditioners (PQCs), which are applied for power quality improvement in three-phase four-wire (3P4W) systems. By means of similar control strategy use, the topology employed to implement the PQCs can operate as unified PQC (UPQC), or, through some circuit modifications, as uninterruptible power supply (UPS) system. Considering 3P4W systems, the use of the dual compensation strategy into the PQCs comprised of two four-leg (4-Leg) converters is the main contribution of this study. Different from the conventional strategies, in the dual compensation strategy, the 4-Leg converter connected in parallel with the load is controlled to operate as a sinusoidal voltage source, whereas the 4-Leg converter connected in series between the grid and the load is controlled to operate as a sinusoidal current source. Both the voltage and current controllers are implemented into the synchronous rotating reference frame, and the converters use the three-dimensional space vector modulation technique. Experimental tests, based on a digital signal processor, are performed in order to validate the theoretical development and to verify both static and dynamic performance of the PQC operating as UPQC, as well as UPS system.

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Power quality improvement using a dual unified power quality conditioner/uninterruptible power supply in three‐phase four‐wire systems

Modesto

Silva

Júnior

2015

IET Power Electronics

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Estudo e Implementação de um Condicionador Unificado de Qualidade de Energia Dual Utilizando Inversores Four-leg

Modesto¹,

Silva²,

Oliveira³

2015

Eletrônica de Potência

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Resumo-Este artigo apresenta o estudo e a implementação de um condicionador de qualidade de energia unificado (UPQC-Unified Power Quality Conditioner) utilizando uma estratégia de compensação dual, o qual é aplicado em sistemas trifásicos a quatro fios, permitindo: i. supressão de correntes harmônicas e a compensação da potência reativa da carga; ii. compensação dos desbalanços das correntes de carga; iii. compensação dos desbalanços e supressão das tensões harmônicas da rede elétrica; iv. regulação das tensões da carga. A topologia de UPQC proposta é implementada por meio de dois conversores PWM four-leg controlados de maneira dual. O primeiro, conectado em paralelo com a carga, é controlado para operar como uma fonte de tensão senoidal. Já o segundo, colocado em série entre a rede elétrica e a carga, opera como fonte de corrente senoidal. Os controladores de tensão e de corrente são implementados no referencial síncrono (dq0). Além disso, a técnica de modulação vetorial espacial tridimensional é empregada nos conversores. Resultados experimentais são apresentados a fim de validar a estratégia dual de compensação e avaliar o desempenho do UPQC.

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Performance Analysis and Technical Feasibility of an iUPQC in Industrial Grids

Cited by 2 publications

References 11 publications

Power quality improvement using a dual unified power quality conditioner/uninterruptible power supply in three‐phase four‐wire systems

Power quality improvement using a dual unified power quality conditioner/uninterruptible power supply in three‐phase four‐wire systems

Estudo e Implementação de um Condicionador Unificado de Qualidade de Energia Dual Utilizando Inversores Four-leg

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