Research on an Electric Vehicle Owner-Friendly Charging Strategy Using Photovoltaic Generation at Office Sites in Major Chinese Cities

Su, Su; Hu, Yong; Yang, Tiantian; Wang, Shidan; Liu, Ziqi; Wei, Xiangxiang; Xia, Mingchao; Ota, Yutaka; Yamashita, Koji

doi:10.3390/en11020421

Cited by 7 publications

(8 citation statements)

References 25 publications

(16 reference statements)

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“…the failure rate of conventional power equipment during stabilization period T 1 the start time of stabilization period T 2 the start time of aging period 2 (t) the failure rate of conventional power equipment during aging period α i (i = 1, 2) the shape parameter of Weibull Distribution β i (i = 1, 2) the scale parameter of Weibull Distribution SAIFI system average interruption frequency index SAIDI system average interruption duration index…”

Section: Nomenclature 1 (T)mentioning

confidence: 99%

An Assessment Procedure of Distribution Network Reliability Considering Photovoltaic Power Integration

He³

et al. 2019

IEEE Access

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As photovoltaic (PV) generation has been one of the major renewable energy sources around the world, its PV capacity has also increased. When the large-scale PV systems are integrated into the distribution network, the complexity of the assessment process of the distribution network reliability will increase hazardously. In order to accurately assess this reliability in the distribution network combined with the PV generation, a reliability assessment procedure is proposed. In order to accurately evaluate the impact of the failure of conventional power equipment on reliability, the time-varying failure rate of conventional power equipment is modeled, taking into account the aging period. Then, in order to accurately evaluate the reliability improvement with PV systems integration, the new procedure is proposed highlighting the following contributions: 1) five new indices are added. 2) PV output is modeled so that not only the radiation intensity but also the failure and degradation of PV modules are represented. 3) time-varying islanding operation is considered and integrated. A case study using real-life distribution network topology and data in China is applied to verify that the newly proposed reliability indices display more sensitivity, and the proposed procedure significantly improves the accuracy of the reliability assessment.

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Section: Nomenclature 1 (T)mentioning

confidence: 99%

An Assessment Procedure of Distribution Network Reliability Considering Photovoltaic Power Integration

He³

et al. 2019

IEEE Access

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“…In Figure 3, F(s) represents the transfer function; I (s) represents the current variation in frequency domain; U (s) represents the voltage variation in frequency domain; Z (s) represents the external characteristic of the power electronic converter, i.e., the impedance model. F(s) usually has the form of the polynomial fraction shown by (1). It should be noted that if U (s) is considered as the input and I (s) as the output, F(s) becomes the admittance model Y (s) (Y (s) = Z (s) −1 ).…”

Section: A Aprinciple Of Impedance Modeling Of Power Electronic Convmentioning

confidence: 99%

“…(iii) In polar coordinate system (8), as shown at the bottom of this page, where Z (1) line , Z (2) line and Z (3) line are the impedance models of the three-phase R-L transmission line in dq coordinate system, sequence coordinate system and polar coordinate system, respectively; V denotes the terminal voltage of the R-L transmission line; and I denotes the current of the R-L transmission line.…”

Section: Impedance Model Derivation In Different Coordinate Systemsmentioning

confidence: 99%

“…Energy depletion and environmental problems boost the development of renewable energy generations [1], among which wind and photovoltaic (PV) power generations are the most representative. Unlike conventional generation units, the power electronic converters are indispensable for the integration of renewable energy generations to the power grid [2], [3].…”

Section: Introduction a Backgroundmentioning

confidence: 99%

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Impedance-Based Oscillatory Stability Analysis of High Power Electronics-Penetrated Power Systems—A Survey

Zhou

et al. 2019

IEEE Access

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With increasing power electronics integrated into the power grids, the new types of oscillation issues have posed a critical threat to the secure operation of power grids. Apart from the conventional eigenvalue-based analysis, the impedance-based analysis becomes more attractive for the assessment of the oscillatory stability. This paper presents a systematic survey on the technical matters of the emerging impedance-based oscillatory stability analysis of power systems with high power electronics penetration. Firstly, the detailed derivation of impedance models of the power electronic converter-connected equipment are discussed. Then, common coordinate systems for the derivation of impedance models, as well as the characteristics of the impedance model in different coordinate systems are surveyed. On this basis, the aggregation of the individual impedance models is introduced to derive the lumped impedance model. Additionally, two typical impedance-based oscillatory stability criteria are demonstrated and discussed in details. Finally, the advantages as well as the limitations of the impedance-based oscillatory stability analysis, and the contributions as well as the challenges of the existing studies are summarized. A list of relevant literature is accommodated in the end.

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“…Jian et al dug the potential of plug‐in EVs as a moveable energy storage device to minimize the overall load variance . Su et al proposed an EV owner‐friendly charging strategy to reduce the line loss as well as the peak–valley difference of load curve …”

Section: Introductionmentioning

confidence: 99%

A Real‐Time Multilevel Energy Management Strategy for Electric Vehicle Charging in a Smart Electric Energy Distribution System

He³

et al. 2019

Energy Tech

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The randomness of electric vehicle (EV) charging has negative impacts on three‐phase imbalance and peak–valley difference in electric energy distribution systems. Traditional EV charging strategies have shortcomings: the performance of three‐phase imbalance mitigation may be limited if the grid‐connected EVs are extremely imbalanced on three phases; in addition, the comprehensive regulation of peak–valley difference and three‐phase imbalance is not developed, and the three‐phase imbalance of reactive power is ignored. Therefore, a real‐time multilevel energy management strategy (RMEMS) for EV charging is proposed. A tri‐level optimization model (TOM) is designed as the central system. In upper‐level optimization, the three‐phase selection (TPS) of EVs is optimized to balance active or reactive power consumption on three phases. Based on the results from upper‐level optimization, the charging active power is regulated in middle‐level optimization to reduce the peak–valley difference on each phase. In lower‐level optimization, the reactive power compensated by EV chargers is optimized based on the results from upper‐level and middle‐level optimization to balance the reactive power on three phases. Case studies show that the proposed RMEMS performs well for balancing active and reactive power consumption on three phases, and the peak–valley differences of active power consumption on each phase are all mitigated.

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Research on an Electric Vehicle Owner-Friendly Charging Strategy Using Photovoltaic Generation at Office Sites in Major Chinese Cities

Cited by 7 publications

References 25 publications

An Assessment Procedure of Distribution Network Reliability Considering Photovoltaic Power Integration

An Assessment Procedure of Distribution Network Reliability Considering Photovoltaic Power Integration

Impedance-Based Oscillatory Stability Analysis of High Power Electronics-Penetrated Power Systems—A Survey

A Real‐Time Multilevel Energy Management Strategy for Electric Vehicle Charging in a Smart Electric Energy Distribution System

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