Electric Vehicle Charging Station With an Energy Storage Stage for Split-DC Bus Voltage Balancing

This paper proposes a novel balancing approach for an electric vehicle bipolar dc charging station at the megawatt level, enabled by a grid-tied neutral-point-clamped converter. The study uses the presence of an energy storage stage with access to both of the dc buses to perform the complementary ba...

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Published inIEEE transactions on power electronics Vol. 32; no. 3; pp. 2376 - 2386
Main Authors Rivera, Sebastian, Bin Wu
Format Journal Article
LanguageEnglish
Published New York IEEE 01.03.2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Batteries
Bipolar dc bus
Charging stations
Converters
Electric vehicle charging
Electric vehicles
electric vehicles (EVs)
Energy management
Energy storage
energy storage stage
fast charger
Hardware
power balance management
Rectifiers
Support vector machines
Switches
Switching sequences
three-level dc–dc converter
Vehicles
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Abstract This paper proposes a novel balancing approach for an electric vehicle bipolar dc charging station at the megawatt level, enabled by a grid-tied neutral-point-clamped converter. The study uses the presence of an energy storage stage with access to both of the dc buses to perform the complementary balance. It proposes a generic balancing structure that can achieve balance regardless the kind of energy storage system (ESS) employed. This is aiming to reduce the hardware requirements of the system and maximize the usage of the ESS, whose main function is to perform the energy management related tasks. To meet this purpose, a three-level dc-dc interface is employed, allowing to compensate the dc currents with a single ESS. Furthermore, in order to prevent the appearance of even-order harmonics in the input current during asymmetrical operation, an alternative switching sequence for the central converter is proposed. Results indicate that, without altering dramatically the charging process of the ESS, it is possible to cover the whole load scenario without the need of a balancing circuit. This allows the use of off-the-shelf products both for the rectifier and the fast chargers. In this paper, simulation and experimental results are presented to validate the proposed balancing strategy.
AbstractList This paper proposes a novel balancing approach for an electric vehicle bipolar dc charging station at the megawatt level, enabled by a grid-tied neutral-point-clamped converter. The study uses the presence of an energy storage stage with access to both of the dc buses to perform the complementary balance. It proposes a generic balancing structure that can achieve balance regardless the kind of energy storage system (ESS) employed. This is aiming to reduce the hardware requirements of the system and maximize the usage of the ESS, whose main function is to perform the energy management related tasks. To meet this purpose, a three-level dc-dc interface is employed, allowing to compensate the dc currents with a single ESS. Furthermore, in order to prevent the appearance of even-order harmonics in the input current during asymmetrical operation, an alternative switching sequence for the central converter is proposed. Results indicate that, without altering dramatically the charging process of the ESS, it is possible to cover the whole load scenario without the need of a balancing circuit. This allows the use of off-the-shelf products both for the rectifier and the fast chargers. In this paper, simulation and experimental results are presented to validate the proposed balancing strategy.
Author Bin Wu
Rivera, Sebastian
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SubjectTerms Batteries
Bipolar dc bus
Charging stations
Converters
Electric vehicle charging
Electric vehicles
electric vehicles (EVs)
Energy management
Energy storage
energy storage stage
fast charger
Hardware
power balance management
Rectifiers
Support vector machines
Switches
Switching sequences
three-level dc–dc converter
Vehicles
Title Electric Vehicle Charging Station With an Energy Storage Stage for Split-DC Bus Voltage Balancing
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