Development and Analysis of a Sensitivity Matrix of a Three-Phase Voltage Unbalance Factor

Kim, Young-Jin

doi:10.1109/tpwrs.2018.2807980

Cited by 43 publications

(16 citation statements)

References 8 publications

(14 reference statements)

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“…The degree of voltage unbalances commonly defined as the ratio of positive to negative sequence voltage component. In this regard, the voltage unbalance factor (VUF) is used to monitor the degree of unbalance as mentioned in [37].…”

Section: Standard Requirement For Voltage Unbalancementioning

confidence: 99%

Power Quality Assessment of Grid-Connected PV System in Compliance with the Recent Integration Requirements

et al. 2020

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The generation and integration of photovoltaic power plants (PVPPs) into the utility grid have increased dramatically over the past two decades. In this sense, and to ensure a high quality of the PVPPs generated power as well as a contribution on the power system security and stability, some of the new power quality requirements imposed by different grid codes and standards in order to regulate the installation of PVPPs and ensure the grid stability. This study aims to investigate the recent integration requirements including voltage sag, voltage flicker, harmonics, voltage unbalance, and frequency variation. Additionally, compliance controls and methods to fulfill these requirements are developed. In line with this, a large-scale three-phase grid-connected PVPP is designed. A modified inverter controller without the use of any extra device is designed to mitigate the sage incidence and achieve the low-voltage ride-through requirement. It can efficiently operate at normal conditions and once sag or faults are detected, it can change the mode of operation and inject a reactive current based on the sag depth. A dynamic voltage regulator and its controller are also designed to control the voltage flicker, fluctuation, and unbalance at the point of common coupling between the PVPP and the grid. The voltage and current harmonics are reduced below the specified limits using proper design and a RLC filter. The obtained results show that the proposed controller fulfilled the recent standard requirements in mitigating power quality (PQ) events. Thus, this study can increase the effort towards the development of smooth PVPP integration by optimizing the design, operation and control strategies towards high PQ and green electricity.

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Section: Standard Requirement For Voltage Unbalancementioning

confidence: 99%

Power Quality Assessment of Grid-Connected PV System in Compliance with the Recent Integration Requirements

et al. 2020

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“…Voltage unbalance is the most frequently occurring PQ phenomenon. Voltage unbalance factor (VUF), which is a ratio of positive to the negative sequence of voltage components, is used to measure the degree of unbalance [86]. The fluctuations in MG are known as slow voltage variations at switches or steady operations.…”

Section: Voltage Unbalance and Fluctuationmentioning

confidence: 99%

Power Quality in Microgrids Including Supraharmonics: Issues, Standards, and Mitigations

et al. 2020

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A microgrid (MG) is a small-scale power system with a cluster of loads and distributed generators operating together through energy management software and devices that act as a single controllable entity with respect to the grid. MG has become a key research element in smart grid and distribution power systems. MG mainly contains different renewable energy sources (RESs) that use various technological advancements, such as power electronics-based technologies. However, it has an unstable output, thereby causing different types of power quality (PQ) events. As a result, standards and mitigation methods have been developed in recent years. To mitigate PQ issues due to MG integration, various methods and standards have been proposed over the last years. Although these individual methods are well documented, a comparative overview had not been introduced so far. Thus, this study aims to fill the gap by reviewing and comparing the prior-art PQ issues, solutions, and standards in MGs. We compare the main issues related to voltage sag, voltage swell, voltage and current harmonics, system unbalances, and fluctuations to ensure high-quality MG output power. The new technologies associated with MGs generate harmonics emission in the range of 2-150 kHz, thereby causing a new phenomenon, namely, supraharmonics (SH) emission, which is not sufficiently covered in the literature. Therefore, the characteristics, causes, consequences, and measurements of SH are highlighted and analyzed. The mitigation strategies, control, and devices of PQ issues are also discussed. Moreover, a comparison is conducted between the most popular devices used to mitigate the PQ issues in MG in terms of cost, rating, and different aspects of performance. This review study can strengthen the efforts toward the mitigation and standards development of PQ issues in MG applications, especially SH. Finally, some recommendations and suggestions to improve PQ of MG, including SH, are highlighted.

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“…5) DEGREE OF THREE-PHASE UNBALANCE Three-phase unbalance refers to the inconsistent of threephase current (or voltage) amplitude in the power system, and the amplitude difference exceeds the specified range [27].…”

Section: ) Equivalent Line Impedancementioning

confidence: 99%

Data-Driven Abnormity Assessment for Low-Voltage Power Consumption and Supplies Based on CRITIC and Improved Radar Chart Algorithms

et al. 2020

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With the wide deployment of advancing metering infrastructure (AMI) in power distribution systems, the quantity of power consumers' electricity data is increasing rapidly and the data also become more and more accurate. To make full use of these power consumers' AMI data, a data-driven abnormity assessment algorithm for low-voltage power consumers is proposed based on the CRITIC (CRiteria Importance Though Intercrieria Correlation) method and the improved radar chart method. First, the indexes that characterize the consumer's abnormal features of power consumption and supplies are extracted from the original AMI data. Then, the abnormity assessment algorithm is used to determine power consumers' abnormal features of power consumption and supplies by using the extracted indexes, in which the weights of indexes are determined by the CRITIC method and the assessment value of abnormal features is determined by the improved radar chart method. Next, the abnormity assessment algorithm is used again to assess power consumers' power consumption and supplies abnormities. Finally, the effectiveness of proposed algorithm is demonstrated in case studies by employing AMI data collected from power utilities in Zhejiang Province, China, and the results show that the algorithm can be used in actual applications. INDEX TERMS Power consumption and supplies data, abnormity assessment, abnormal feature of power consumption and supplies, CRITIC method, improved radar chart method.

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Development and Analysis of a Sensitivity Matrix of a Three-Phase Voltage Unbalance Factor

Cited by 43 publications

References 8 publications

Power Quality Assessment of Grid-Connected PV System in Compliance with the Recent Integration Requirements

Power Quality Assessment of Grid-Connected PV System in Compliance with the Recent Integration Requirements

Power Quality in Microgrids Including Supraharmonics: Issues, Standards, and Mitigations

Data-Driven Abnormity Assessment for Low-Voltage Power Consumption and Supplies Based on CRITIC and Improved Radar Chart Algorithms

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