Sliding Mode Control of Unified Power Quality Conditioner for 3 Phase 4 Wire Systems
This paper presents the sliding mode control (SMC) of unified power quality conditioners (UPQC) intended to compensate power quality issues in three-phase four-wires systems. The SMC UPQC can be applied in electrical grids or isolated grids to mitigate po
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stract. This paper presents the sliding mode control (SMC) of unified power quality conditioners (UPQC) intended to compensate power quality issues in three-phase four-wires systems. The SMC UPQC can be applied in electrical grids or isolated grids to mitigate power quality problems at the consumer facilities and also to minimize issues for the grid supplier. The UPQC is configured as a shunt-series filter. The shunt Active Power Filter (APF) uses a three-phase rectifier with SMC to enforce sinusoidal mains currents. The series APF uses three single-phase H-bridge inverters and SMC to improve the voltage quality at the point of common coupling. SMC design, analysis and simulation results are presented and discussed. Keywords: Unified Power Quality Conditioner, Active Power Filter, Sliding Mode Control.
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Introduction
In recent years, economic and environmental reasons entail the best possible use of energy resources. Recent technological developments enabled better usage of energy resources, mainly alternative energies [1]. However, due to the usually relatively low duty-cycle and randomness of these energies, their interconnection to the electrical grid might require the use of power electronics systems, and power quality mitigating devices, such APF, to increasing power quality [2], according to the standards recommended maximum power quality disturbances (IEEE 519, IEC 50160). Most common power quality issues arise in the distribution grids, including voltage variations, harmonics, voltage sags and swells, voltage unbalances, harmonic currents, high reactive power burden and excessive neutral wire current. APFs can solve voltage and current waveform issues, reducing harmonics in a wide frequency band without resonance problems [3].
L.M. Camarinha-Matos et al. (Eds.): DoCEIS 2014, IFIP AICT 423, pp. 443–450, 2014. © IFIP International Federation for Information Processing 2014
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N. Santos, J.F.A. Silva, and J. Santana
Contribution to Collective Awareness Systems
This paper proposes a UPQC system with the ability to increase the quality of distribution of electrical power to achieve better efficiency. It proposes a contribution towards the sustainability of global systems considering the economic aspect and the environmental, reaching an important advance in the sustainable growth systems while benefiting from future collective awareness system to take informed decisions, making effective the involvement of the customer and sustainable energy systems.
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UPQC Topology
Conventional UPQC have two basic configurations [3]. The most common is the series-shunt which injects the voltage compensation at the source side and the current compensation at the load side. This configuration has the advantage of the current flowing through the series transformer containing only the fundamental frequency. The shunt-series UPQC injects currents at the source side and compensates voltage at the load side. This configuration has the advantage of avoiding the interference between the shunt inverter and the passive filte
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