Efficacy of solar EV Duo: way to voltage sag mitigation

Mitra, Rituparna; Goswami, Arup Kumar; Tiwari, Prashant

doi:10.1049/iet-gtd.2018.6273

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…In the literature, most charging optimization studies have focused on reducing the frequency deviation [19], peak load [20], line or transformer overloading [21], current unbalance [22], voltage sags [23], network costs [24], charging costs to the EV owners [25], or charging costs to the station owners [26,27]; however, the quality of charging service in terms of lost energy is considered in one way or another only in [10,11,14]. From these three studies, real charging data is only used in [10].…”

Section: Introductionmentioning

confidence: 99%

Electric Vehicles as a Flexibility Provider: Optimal Charging Schedules to Improve the Quality of Charging Service

et al. 2021

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The sub-aggregation of electric vehicles provides significant potential to power systems in the form of ancillary services. This means with smart charging it is possible to shift loads from peak to off-peak hours. For the flexibility from privately owned electric vehicles to be offered to the electricity market, customer participation is crucial; however, the impacts of sub-aggregation on customers have not been studied thoroughly. In this paper, charging data covering over 80,000 real-world charging sessions from various commercial charging sites are introduced and the charging characteristics are analyzed. Importantly, a method for finding an optimal pattern for load reduction with the least impact on customers is presented. We suggest an optimal schedule for load reduction from the customer viewpoint at different types of charging sites, including public car parks, offices, residential sites, and shopping centers. The findings indicate that residential and office charging sites offer the greatest potential for load reduction with the least impact on customers. The most flexibility is available during peak charging hours, which on average are at 08:00 at car parks, 07:30 at office sites, 19:00 at residential sites, and 10:00 at shopping centers.

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Section: Introductionmentioning

confidence: 99%

Electric Vehicles as a Flexibility Provider: Optimal Charging Schedules to Improve the Quality of Charging Service

et al. 2021

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“…Voltage sag may lead to abnormal operation of sensitive equipment in the industrial process, bringing huge economic losses to industrial users [1][2][3]. Adjustable speed drive (ASD) is the indispensable but sensitive equipment in industrial processes, which may trip the process under voltage sags [4].…”

Section: Introductionmentioning

confidence: 99%

Practical tables for tolerance assessment of adjustable speed drives under voltage sag

Wang

Yang

et al. 2021

IET Generation Trans & Dist

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The tolerance of adjustable speed drive (ASD) under voltage sag is important for users to select equipment and take mitigation methods. However, it is not easy for users to obtain the tolerance information of ASD. To address this issue, this paper proposes practical tables for tolerance assessment of ASD under voltage sag, providing a simpler and faster way for an approximate understanding of the tolerance of ASD. First, this paper proposes a calculation method for three trip characteristics to describe the tolerance of ASD. Second, this paper presents a voltage tolerance curve (VTC) assessment model based on the three trip characteristics, and the coordinate of the "knee point" of VTC can be assessed straightforwardly. Furthermore, the practical tables for tolerance assessment of ASD are formed based on the studies mentioned above. Users can obtain the tolerance of ASDs by looking up the table when they know several key parameters. Simulations tests verify the effectiveness of the calculation method and practical tables. INTRODUCTIONVoltage sag may lead to abnormal operation of sensitive equipment in the industrial process, bringing huge economic losses to industrial users [1-3]. Adjustable speed drive (ASD) is the indispensable but sensitive equipment in industrial processes, which may trip the process under voltage sags [4]. However, there is limited information about the tolerance of ASD from manufacturers [5]. Utilities and the users are interested in a simpler and faster method for an approximate understanding of the tolerance of ASD under voltage sag, when purchasing ASDs or mitigation equipment against voltage sag. The voltage tolerance curve (VTC) [6] is used to quantify the tolerance of ASD usually. There are two typical ways to obtain VTCs under voltage sags.The first way is the experimental test. IEEE Std. 1668-2017 [7] and IEC 61000-4-11 [8] recommend tolerance testing methods. The test results show that there are two major causes of ASD shutdown under voltage sag [9,10]: (i) the low DC voltage triggering the low-voltage protection (LVP) during the voltage sag, (ii) the inrush current triggering the overcurrent protection (OCP) at the ending of sag. DC voltage and current are affectedThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…The mitigation method of voltage sag is usually carried out on the grid side [10][11][12], the user side [13,14], or other locations [15,16]. The mitigation equipment (ME) is usually configured with the goal of economic benefit or mitigation effect.…”

Section: Introductionmentioning

confidence: 99%

“…Last but not least, the capacity configuration of ME is too simple, and ignores some key factors. The previous studies have considered the economic and technical factors to configure ME, including the severity of node sags [12, 13], sensitive user types [4, 26] and economic benefits [20, 21, 31]. However, there are some issues that are ignored, such as the tolerance of SE, the economic loss of SE under voltage sag and SE trip probability.…”

Section: Introductionmentioning

confidence: 99%

Configuration strategy of shared mitigation equipment for voltage sag considering the demands of users

Wang

Yang

Xiao

et al. 2020

IET Generation Trans & Dist

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It is an effective way to mitigate voltage sag by equipping custom power devices in premium power park (PPP), and the key lies in the balance between technology and economy. This study proposes a method to mitigate voltage sags to meet the needs of different sensitive users in PPP to ensure the mitigation effect and reduce mitigation costs. Firstly, a strategy of shared mitigation equipment (ME) and its operation mode is presented, including the multiple stakeholders, the structure of shared ME, and the scheme of the switch on/off to improve the utilisation rate of ME. Secondly, a sensitive equipment (SE) grouping method is proposed, which is suitable for shared ME strategy, considering the minimum compensation voltage magnitude and the economic loss caused by voltage sag. Meanwhile, this study proposes an assessment method of SE failure probability based on the three‐parameter Weibull function to design the capacity of ME reasonably. Thirdly, a multi‐objective collaborative optimisation model is established based on economic loss assessment to maximise the net income of investors and users. Finally, the effectiveness of the proposed method has been proved through the case study of two sensitive users in PPP.

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Efficacy of solar EV Duo: way to voltage sag mitigation

Cited by 6 publications

References 30 publications

Electric Vehicles as a Flexibility Provider: Optimal Charging Schedules to Improve the Quality of Charging Service

Electric Vehicles as a Flexibility Provider: Optimal Charging Schedules to Improve the Quality of Charging Service

Practical tables for tolerance assessment of adjustable speed drives under voltage sag

Configuration strategy of shared mitigation equipment for voltage sag considering the demands of users

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