Comparison of UPQC Topologies for Power Quality Enhancement in Grid Integrated Renewable Energy Sources

This paper presents a novel seamless switching technology between different operating conditions of the Unified Power Quality Conditioner (UPQC) with the energy storage system. Frequent start and stop of the series inverter will cause shock and loss under the conventional control method. Moreover, it is a key issue to achieve seamless switching when the UPQC operating condition changes. This paper proposes an improved power angle control (PAC) method to solve these problems. An agile power angle is calculated by this method under stable operating conditions. This feature enables the series inverter to share the load reactive power with the shunt inverter. On the other hand, both the series and shunt inverters are in an easy-to-switch operating state which can help achieve better seamless switching between different operating conditions. Simulation results show the shunt inverter capacity can be reduced up to 47% due to the reactive power sharing by both the inverters which means the reactive power burden of the shunt inverter is great lightened. It is also found that the switching time is about 300μs faster and the maximum voltage fluctuation amplitude is about 90V smaller under improved PAC than the conventional control method.

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“…Figs. (17)(18)(19)(20)(21)(22) shows the simulation results with the proposed control in this paper.…”

Section: Resultsmentioning

confidence: 97%

“…A comprehensive review of UPQC is reported in [16]. A detailed comparison of design and operational aspects of UPQC-Multiconverter and UPQC-Distributed Generation in [17]. A 3-phase 4-wire UPQC structure is proposed in [18], which has the ability to achieve a dual compensation strategy.…”

Section: Introductionmentioning

confidence: 99%

Seamless Switching Technology of UPQC Based on Improved Power Angle Control

Shi

Wang

et al. 2021

Glob. J. Energ. Technol. Res. Updat.

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“…In [30], UPQCs were classified into two main categories depending on the physical structure and the voltage sag compensation method. This classification was recurringly mentioned in multiple literature reviews investigating the different types of UPQC topologies [31] - [33]. Also, [34] has categorized the types of UPQCs according to their application.…”

Section: Classification Of Upqcsmentioning

confidence: 91%

Unified Power Quality Conditioners Based Different Structural Arrangements: A Comprehensive Review

et al. 2023

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Mitigating power quality issues in distribution systems is of utmost importance to both electricity consumers and suppliers as it improves the distribution system's efficiency, reduces electricity costs, maintains continuous supply, and diminishes the requirement for frequent maintenance. Custom power devices were introduced to eliminate power quality issues like voltage sags, swells, transients, imbalances, and current harmonics arising in distribution systems. Unified power quality conditioner (UPQC) is one such frequently used custom power device that enhances the power quality of distribution systems. Various structural arrangements of UPQCs with improved performance capability were introduced within the last few decades. The main aim of this paper is to review the most frequently explored UPQC models in literature and to observe the impact of these UPQC structural configurations on their performance as well as that of the overall distribution system. Also, this study investigates the properties, applications, and control techniques used by these structural configurations of UPQCs to mitigate power quality issues.

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“…The design and modeling of UPQC (SEAPF and SHAPF) for compensation of system harmonics and voltage controllers are discussed [47,48].…”

Section: Introductionmentioning

confidence: 99%

Effect of Unified Power Quality Conditioner on Voltage and Current Waveforms

Mahmoud¹,

Mamdouh²,

Khalil

2021

Walailak J Sci & Tech

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Power quality improvement faces different and significant problems due to voltage instability and the wide use of electronic power devices. To overcome these different power quality problems, an active power filter is used. The active power filter, in general, has 4 main categories- shunt, series, unified power quality conditioner, and hybrid active power filter. The shunt active power filter is usually used to mitigate source current harmonics and compensate reactive power for power factor correction. The series active power filter is usually used to mitigate voltage problems (sags, swells, transients, dips, distortions, harmonics, etc.). The unified power quality conditioner is a combination of the shunt active power filter and the series active power filter; it is used to mitigate all voltage and current problems, compensate voltage, current system harmonics, and reactive power compensation, and mitigate voltage dips, voltage sags, voltage swells, and voltage phase shift. In this paper, the 3-phase 3-wire unified power quality conditioner is utilized to mitigate all power system problems (voltages and currents) and discuss the effect of the shunt and series active power filter separately on source voltage and source current waveforms. This case study shows that the source voltage distortion can be mitigated by using the series active power filter alone, but the source current distortion cannot be mitigated without using both the series and shunt active power filter. The source current harmonic problem mainly exists due to 1) distorted voltage sources, and 2) non-linear loads. Therefore, the unified power quality conditioner must be used to mitigate source current distortions in the case of the distorted voltage source, to comply with the standard limits IEEE 519, IEC 555, and IEC 61000. HIGHLIGHTS The UPQC is used to mitigate all voltage and current problems and improve all power system quality The SEAPF eliminates all voltage problems The SHAPF has no effect on source voltage The SHAPF eliminates source current harmonic distortion GRAPHICAL ABSTRACT

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Comparison of UPQC Topologies for Power Quality Enhancement in Grid Integrated Renewable Energy Sources

Cited by 9 publications

References 6 publications

Seamless Switching Technology of UPQC Based on Improved Power Angle Control

Seamless Switching Technology of UPQC Based on Improved Power Angle Control

Unified Power Quality Conditioners Based Different Structural Arrangements: A Comprehensive Review

Effect of Unified Power Quality Conditioner on Voltage and Current Waveforms

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