A statistical method for predicting the net harmonic currents generated by a concentration of electric vehicle battery chargers

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · IEEE Transactions on Power Delivery

DOI:https://doi.org/10.1109/61.637002· OSTI ID:522377

Staats, P T; Grady, W M; Arapostathis, A ^[1]; Thallam, R S ^[2]

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1. Univ. of Texas, Austin, TX (United States)
2. Salt River Project, Phoenix, AZ (United States)

This paper presents a method for predicting the net harmonic currents produced by a large number of electric vehicle (EV) battery chargers. The problem is stochastically formulated in order to account for randomness in individual charger start-time and battery state-of-charge. The authors introduce a model that allows for partial harmonics cancellation due to diversity in magnitudes and phase angles. A general solution technique is presented along with an example using data from a commercially available EV charger. The results show that a limiting distribution of 7--10 chargers is adequate for accurately predicting harmonic injection currents using the Central Limit Theorem. The authors also show that the expected values of net harmonic currents are considerably less than the peak values that would have been realized if the same number of chargers were operated in unison.

• Sponsoring Organization: Electric Power Research Inst., Palo Alto, CA (United States)
• OSTI ID: 522377
• Journal Information: IEEE Transactions on Power Delivery, Journal Name: IEEE Transactions on Power Delivery Journal Issue: 3 Vol. 12; ISSN 0885-8977; ISSN ITPDE5
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
33 ADVANCED PROPULSION SYSTEMS
BATTERY CHARGE STATE
BATTERY CHARGERS
ELECTRIC-POWERED VEHICLES
HARMONICS
MATHEMATICAL MODELS
POWER DISTRIBUTION SYSTEMS