A Study on Compensating Voltage Drop in Distribution Systems due to Nighttime Simultaneous Charging of Electric Vehicles Utilizing Charging Power Adjustment and Reactive Power Injection

Mitsukuri, Yuki; Hara, Ryoichi; Kita, Hidetoshi; Kamiya, Eiji; Taki, Shoji; Hiraiwa, Naoya; Kogure, Eiji

doi:10.1541/ieejpes.133.157

Cited by 10 publications

(7 citation statements)

References 11 publications

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“…If voltage fluctuations could be partly eliminated, then using this function of rapid chargers for reactive power compensation offers cost reduction of voltage regulation on the grid side. Besides, the same effect can be expected with voltage control schemes using standard chargers installed at homes, and so on, as examined in literature [12,13]. However, voltage regulation using standard chargers is only possible when EV is connected, which means a limited effect; thus, rapid chargers with constant control effect have a greater potential.…”

Section: Introductionmentioning

confidence: 55%

Voltage Regulation Utilizing Electric Vehicle Rapid Chargers in a Distribution System

Nakamura

Hara

Kita

et al. 2018

Electrical Engineering Japan

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From growing interests in the environment issues, promotion of photovoltaic power generation (PV) is accelerated in the world. Meanwhile, rapid chargers (RCs) for popularized electric vehicles are being installed in urban areas. These two trends in distribution system might cause severer voltage fluctuation problems. On the other hand, a RC can provide the reactive power support, which is capable of voltage regulation. Based on this viewpoint, this paper proposes a new framework of voltage regulation, in which the reactive power compensation by RCs is actively utilized. The proposed voltage regulation method combines two different control functions with consideration for overcompensation avoidance. This paper ascertains the validity of proposed voltage regulation method through numerical simulations. C⃝ 2018 Wiley Periodicals, Inc. Electr Eng Jpn, 204(3): 21-30, 2018; Published online in Wiley Online Library (wileyonlinelibrary.com).

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Section: Introductionmentioning

confidence: 55%

Voltage Regulation Utilizing Electric Vehicle Rapid Chargers in a Distribution System

Nakamura

Hara

Kita

et al. 2018

Electrical Engineering Japan

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“…, lagging reactive power output is decreased according to Equation (5). Here, V ref is reference voltage and PCS is PCS control dead bandwidth.…”

Section: Proposed Autonomous Reactive Power Control Using Pcsmentioning

confidence: 99%

“…System voltage declines with load increase due to night charging and may drop beyond its specified range. 5,6 Conventionally, system voltage is kept within its specified range through tap switching of load ratio control transformers (LRTs) or step voltage regulators (SVRs) installed at distribution substations and on distribution lines. 7 However, tap switching operations of LRT and SVR take several 10 s; therefore, abrupt fluctuations of PV system output and voltage fluctuations due to night charging of many EVs and PHEVs are not necessarily fully compensated.…”

Section: Introductionmentioning

confidence: 99%

Reactive Power Control of Power Conditioning Systems to Avoid Voltage Deviation in High-voltage Distribution Systems Caused by Both of Photovoltaic Generation and Electric Vehicle Charging

et al. 2018

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The introduction of electric vehicles has been increasing as well as photovoltaic generation systems. These introductions cause the voltage drop and rise on high-voltage distribution lines, so that voltage deviation will be out of the specified voltage range. As a countermeasure against this problem, the voltage control method with static Var compensators (SVCs) is implemented. However, SVCs are expensive and power losses on the distribution line increase. This paper proposes a novel voltage control method in which power conditioning systems output leading and lagging reactive power aiming to solve the above-mentioned problems. It is clarified that the proposed method is more effective in solution of these problems than compared with the voltage control method using SVCs. K E Y W O R D Shigh-voltage distribution system, leading and lagging reactive power, photovoltaic generation, power conditioning system, static var compensator Electr Eng Jpn. 2018;205:3-10.

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“…Finally, the reactive power support from normal chargers at residential houses has been evaluated for both LV and medium‐voltage (MV) distribution networks . Furthermore, the fast EV chargeable hosting capacity has been evaluated for MV distribution networks only .…”

Section: Introductionmentioning

confidence: 99%

Increasing electric vehicle hosting capacity and equality for fast charging stations using residential photovoltaics in medium‐ and low‐voltage distribution networks

Sugihara

Funaki

2019

IEEJ Transactions Elec Engng

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To achieve broad installation of electric vehicles (EVs), it is important to deploy fast EV charging stations at many points without distribution network reinforcement. This study develops a methodology for evaluating the hosting capacity for fast EV charging loads under medium-and low-voltage (MV and LV) distribution networks with bus-voltage and line-current constraints; hence, the promising combination of fast EV charging and rooftop photovoltaic (PV) generation in distribution networks is analyzed. In particular, on a sunny day, the active power output supplied by rooftop PVs can be used to mitigate the voltage drop problem for end-use residential customers. On a cloudy day, even though the active power output is smaller, the residual inverter capacities of rooftop PVs can be used to generate reactive power from those systems. In addition, in order to evaluate the spatial equalization of the EV hosting capacity at fast charging stations, an equalization factor of the spatial distribution is proposed, which is obtained as a percentage of the EV hosting capacity in the equally maximized case over that in the simply maximized case. The equalization factor can be improved from approximately 33 to 70% using the active and reactive power outputs from residential rooftop PVs.

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A Study on Compensating Voltage Drop in Distribution Systems due to Nighttime Simultaneous Charging of Electric Vehicles Utilizing Charging Power Adjustment and Reactive Power Injection

Cited by 10 publications

References 11 publications

Voltage Regulation Utilizing Electric Vehicle Rapid Chargers in a Distribution System

Voltage Regulation Utilizing Electric Vehicle Rapid Chargers in a Distribution System

Reactive Power Control of Power Conditioning Systems to Avoid Voltage Deviation in High-voltage Distribution Systems Caused by Both of Photovoltaic Generation and Electric Vehicle Charging

Increasing electric vehicle hosting capacity and equality for fast charging stations using residential photovoltaics in medium‐ and low‐voltage distribution networks

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