A Study on the Modeling of Step Voltage Regulator and Energy Storage System in Distribution System Using the PSCAD/EMTDC

Kim, Byungki; 김기영,; 이주광,; Choi, Sung-Sik; Rho, Dae-Seok

doi:10.5762/kais.2015.16.2.1355

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…Sales in South Korea by 2030 are estimated to be 3 million units based on the "National Roadmap for 2030" according to the cumulative base, compared to around 93,000 units in 2020. As a result, the market of used EV batteries is also expected to significantly increase [1][2][3]. On the other hand, since used batteries require full inspections due to the degradation characteristics, which vary depending on the operation environment and conditions, numerous studies on saving the time cost for the inspections have been carried out [4].…”

Section: Introductionmentioning

confidence: 99%

Evaluation Method of Internal Resistance for Repurposing Using Middle and Large-Sized Batteries

et al. 2023

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The number of used batteries is expected to dramatically increase in the near future due to the expansion of the electric vehicle (EV) market globally. Accordingly, the Korean government has improved the supporting structures for the recycling system for used batteries, and in particular, in the field of repurposing, various studies are being conducted with a focus on effective evaluation methods that can secure the performance and safety of batteries after use. The repurposing of used batteries is mostly adapted in the field of energy storage systems for normally used EV batteries and a total inspection before repurposing is required due to battery characteristics that can vary depending on the operational environments of and accidents involving medium- and large-sized batteries for EVs and energy storage systems (ESSs) that have been occurring continuously for the past few years. Therefore, this paper investigates the operating mechanisms of the internal resistance test method and implements a test device for middle- and large-sized cells and packs. Based on the proposed test method, the internal resistance of nickel manganese cobalt (NMC)-type commercial large batteries is analyzed according to the SOC (state of charge), SOH (state of health), ambient temperature, and connection degradation of batteries. The distribution degrees of the alternative current (AC) internal resistance (IR) and direct current (DC) internal resistance (IR) measurement methods under state of health (SOH) test conditions are about 7% and 50%. It was found that the DC IR measurement method is more effective in diagnosing battery cell degradation. The distribution degree of DC IR measurements for the degraded connection condition shows an increase of less than 1% regardless of the state of charge (SOC), while the distribution degree of the AC IR measurements shows an increase of up to 319%, indicating that the AC IR method is more effective than the DC IR method in identifying connection degradation. It is confirmed that the proposed method is effective in internal resistance measurement and safety evaluations for the repurposing of batteries.

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Section: Introductionmentioning

confidence: 99%

Evaluation Method of Internal Resistance for Repurposing Using Middle and Large-Sized Batteries

et al. 2023

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“…Under the circumstance, the step voltage regulator (SVR), a voltage compensation device, is applied for voltage stabilization. SVR is also typically installed at the position of 10% voltage drop in the primary feeder, and it is operated by a line drop compensation method [2][3][4]. However, the operation time of a SVR is delayed from 120 to 900 s (named the scheduled delay time) due to mechanical characteristic of SVR.…”

Section: Introductionmentioning

confidence: 99%

“…During the scheduled delay time, the customer voltage could not be maintained within the allowable limit. The references [5] and [2] dealt with contents to solve the feeder voltage problems using a LDC (line drop compensation) operation method that adjusts the sending voltage based on the increase and decrease of the load current, when a Photovoltaic (PV) system is interconnected with the primary feeder. However, the consumer voltage cannot maintain a nominal voltage boundary during the delay time of SVR tap operation.…”

Section: Introductionmentioning

confidence: 99%

Novel Voltage Control Method of the Primary Feeder by the Energy Storage System and Step Voltage Regulator

Kim

Nam

et al. 2019

Energies

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With the intention of keep the customer voltage within a nominal voltage boundary (the South Korea voltage regulation in range of 220 V ± 6% for a single phase), the SVR (step voltage regulator) method in the primary feeder has been seriously systematized for the scheduled tap time delay (from a minimum of 120 s to a maximum of 900 s). The voltage must be compensated for the primary feeder during the tap delay time of SVR. However, when RES (renewable energy resource) is connected with the primary feeder, the customer voltage could exceed the nominal voltage boundary. Therefore, in order to keep the secondary feeder voltage within the nominal voltage boundary at all the time, this paper proposed a novel voltage control method in the primary feeder using coordinated controls between ESS (energy storage system) and SVR. Through the simulations based on PSCAD/EMTDC which is analysis tool of power system, it is confirmed that the proposed algorithm can effectively control the customer voltage within allowable limitation.

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“…(1). Therefore, the optimal setting values of SVR can be obtained by solving the equation for V and Z [8][9][10]. (1) where, is optimal sending voltage, is load center voltage, is equivalent impedance, and 7 is total load currents of main transformer.…”

Section: Operation Algorithm Of Svrmentioning

confidence: 99%

A Study on the Voltage Stabilization Method of Distribution System Using Battery Energy Storage System and Step Voltage Regulator

Kim¹,

Park²,

Choi³

et al. 2017

Journal of Electrical Engineering and Technology

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-In order to maintain customer voltages within the allowable limit(220±13V) as much as possible, tap operation strategy of SVR(Step Voltage Regulator) which is located in primary feeder, is widely used for voltage control in the utilities. However, SVR in nature has operation characteristic of the delay time ranging from 30 to 150 sec, and then the compensation of BESS (Battery Energy Storage System) during the delay time is being required because the customer voltages in distribution system may violate the allowable limit during the delay time of SVR. Furthermore, interconnection of PV(Photovoltaic) system could make a difficultly to keep customer voltage within the allowable limit. Therefore, this paper presents an optimal coordination operation algorithm between BESS and SVR based on a conventional LDC (Line Drop Compensation) method which is decided by stochastic approach. Through the modeling of SVR and BESS using the PSCAD/EMTDC, it is confirmed that customer voltages in distribution system can be maintained within the allowable limit.

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A Study on the Modeling of Step Voltage Regulator and Energy Storage System in Distribution System Using the PSCAD/EMTDC

Cited by 5 publications

References 3 publications

Evaluation Method of Internal Resistance for Repurposing Using Middle and Large-Sized Batteries

Evaluation Method of Internal Resistance for Repurposing Using Middle and Large-Sized Batteries

Novel Voltage Control Method of the Primary Feeder by the Energy Storage System and Step Voltage Regulator

A Study on the Voltage Stabilization Method of Distribution System Using Battery Energy Storage System and Step Voltage Regulator

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