Implementation of a 1-kVA programmable balanced three-phase voltage sag generator

Kumsuwan, Yuttana; Boonmee, Chaiyant; Premrudeepreechacharn, S.

doi:10.1109/ecticon.2009.5136962

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…A voltage dip generator is a device that can be used to simulate voltage dip conditions of the power grid in a laboratory or field test environment [18]. In summary, four different types of voltage dip generators can be used to test PVI: shunt impedancebased VDG, transformer-based VDG, generator-based VDG, and full converter-based VDG [18][19][20][21][22][23][24][25][26]. Figure 3 summarizes these topologies.…”

Section: Overview Of Voltage Dip Generatorsmentioning

confidence: 99%

“…Figure 3c shows the generator-based VDG scheme, where the synchronous generator can be controlled to generate voltage dips by changing the field excitation voltage [18,19]. In [25,26] synchronous generators-based VDGs are developed and one may notice that the voltage dips are generated with a rather slow decrease rate of voltage in several cycles. In [18], a comprehensive overview of the four types of VDG is presented and the authors conclude that the generator-based VDG is not recommended to be used for renewable energy systems applications.…”

Section: Overview Of Voltage Dip Generatorsmentioning

confidence: 99%

“…Overview of the four different topologies of voltage dip generators (VDG) [18–26]. (a) Shunt impedance‐based VDG.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of fault current contributions from small‐scale single‐phase photovoltaic inverters and their impacts on the protection of electric power distribution systems

de Almeida,

da Costa Lima,

Macedo Junior

2024

IET Generation Trans & Dist

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This paper presents an analysis of the fault current contributions of small‐scale single‐phase photovoltaic inverters under grid‐connected operation and their potential impact on the protection of distribution systems. To conduct this analysis, an autotransformer‐based voltage dip generator is proposed as a means to test the photovoltaic inverters' contribution to short‐circuit currents. Laboratory tests are then performed to obtain the short‐circuit current contribution of eight single‐phase photovoltaic inverters. Using the short‐circuit current data obtained, a behaviour model is developed and simulated on Matlab‐Simulink. The model is then applied to a real distribution system and case studies are conducted to simulate the potential impacts on the protection system. Results indicate that while the massive penetration of small‐scale single‐phase photovoltaic inverters can alter the protection system's operating time, the impacts are not significant. Only in very specific scenarios, such as events related to high impedance faults, some impact can be observed. In these situations, the presence of photovoltaic inverters further complicates the already difficult task of identifying high impedance faults through conventional overcurrent protections. This study provides valuable insights into the integration of photovoltaic inverters into distribution systems, and can aid in the development of effective protection measures for future grid designs.

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Section: Overview Of Voltage Dip Generatorsmentioning

confidence: 99%

Section: Overview Of Voltage Dip Generatorsmentioning

confidence: 99%

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Analysis of fault current contributions from small‐scale single‐phase photovoltaic inverters and their impacts on the protection of electric power distribution systems

de Almeida,

da Costa Lima,

Macedo Junior

2024

IET Generation Trans & Dist

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“…And the controllable voltage recovery curve should also be provided by VSG. According to topologies, there are four types of VSGs [28]- [44], generator-based VSGs [28], shunt impedance-based VSG [29]- [31], transformer-based VSG [32]- [36], and full converter-based VSG [37]- [42]. These popular VSG schemes are briefly summarized in the following subsections, and the advantages and disadvantages of these VSG schemes are also compared and discussed.…”

Section: Review On Voltage Sag Generator Schemesmentioning

confidence: 99%

Cause, Classification of Voltage Sag, and Voltage Sag Emulators and Applications: A Comprehensive Overview

et al. 2020

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The large-scale application of wind power and photovoltaic power solves the energy crisis and alleviates the environmental problems caused by the use of conventional energy. However, they are at risk of being randomly tripped from the network when faced to voltage sag and severe fault events, which will lead to a sudden reduction of active power output and also complicates fault recovery process of the whole system. Moreover, it may also aggravate failures and lead to large-scale power outages, which stimulates a growing interest in analyzing the low-voltage ride-through (LVRT) capabilities of the renewable energy systems (RES) and improving the performance through developing various mathematical models and analysis tools. In this paper, a systematical overview of cause, classification of voltage sag phenomena and voltage sag emulating techniques is presented, and four voltage sag generators (VSGs) are discussed and compared, which include generator based-VSG, shunt impedance based-VSG, transformer based-VSG and full converter based-VSG. Furthermore, a closed-loop detection platform based on real-time digital simulator (RTDS) for the converter controller of a permanent magnet synchronous generator (PWSG) set is introduced, to investigate the LVRT performance of the WT system under grid voltage sag conditions. Finally, the application of VSG in RES are presented and the future research directions are also discussed. INDEX TERMSVoltage sag generator, renewable energy systems, low voltage ride through, power quality, distributed generation (DG), PV, wind power generation system. II. CAUSES, PROPAGATION CHARACTERISTICS AND CLASSIFICATION OF VOLTAGE SAGIn this section, the causes, characteristics, propagation and harm of voltage sags are analyzed, which would be described in the following subsections. A. CAUSES OF VOLTAGE SAGThe main forms of short circuit fault are the single-phase grounding short-circuit, two-phase interphase short-circuit, the two-phase grounding short-circuit and the three-phase grounding short-circuit [17], with a probability of about 70%, 15%, 10%, 5%. In general, the closer to the point of failure, the greater the voltage sag, and the more serious the hazard would be generated for the sensitive electric devices. B. CHARACTERISTICS OF VOLTAGE SAGVoltage sag characteristics include the voltage sag amplitude, duration, fault frequency and voltage phase jump. As shown in Fig. 4, U A , U B , U C denotes sag depth, and t a , t b , t c denotes the duration of voltage sag in each phase [18], [19].

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“…This method is simple and easy to implement, but it has the drawbacks of large energy consumption, low accuracy, and adjustment discontinuity. The synchronous-generator-based VSG can simulate the load side voltage sags by changing the exciting current, which has the drawbacks of slow response, only symmetrical faults emulation, relatively large weight, and high cost [14,15]. The transformer-based VSG is implemented by constructing the output voltage switchover of the autotransformer to simulate the actual grid voltage sag [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Multi-Mode Voltage Sag/Swell Generator Based on Three-Phase Inverter Circuit

Han

Wang

et al. 2021

Energies

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The voltage ride through capability of the major auxiliary variable-frequency drive (VFD) in large thermal power plants is the key technical issue of power grid and source coordination. In order to test the high voltage ride through (HVRT) and low voltage ride through (LVRT) capability of the auxiliary VFD, it is necessary to develop a power supply to simulate different grid voltage sag and swell accurately. In this paper, a generator (VSSG) based on the common three-phase inverter circuit that can simulate multi-mode voltage sag/swell is proposed. The designed main circuit consisting of transformer, rectifier, DC split capacitors, three-phase inverter, and LC-filter can generate single-phase and three-phase voltage sag, swell, and phase angle jumping flexibly. The developed control strategies composed of the double closed-loop control and the neutral voltage balance control achieve accurate output, fast dynamic response, and step-less adjustment. Simulation and experiment results verify the multi-mode voltage simulation performances of the proposed VSSG, which can be effectively used to emulate power grid voltage sag and swell phenomena under the IEEE 1159 and IEC standards.

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Implementation of a 1-kVA programmable balanced three-phase voltage sag generator

Cited by 7 publications

References 10 publications

Analysis of fault current contributions from small‐scale single‐phase photovoltaic inverters and their impacts on the protection of electric power distribution systems

Analysis of fault current contributions from small‐scale single‐phase photovoltaic inverters and their impacts on the protection of electric power distribution systems

Cause, Classification of Voltage Sag, and Voltage Sag Emulators and Applications: A Comprehensive Overview

Multi-Mode Voltage Sag/Swell Generator Based on Three-Phase Inverter Circuit

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