Design, Testing, and Validation of a Simplified Control Scheme for a Novel Plug-In Hybrid Electric Vehicle Battery Cell Equalizer

Cassani, Pablo A.; Williamson, Sheldon S.

doi:10.1109/tie.2010.2050750

Cited by 205 publications

(81 citation statements)

References 14 publications

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“…In this paper, in order to meet the customer's demand for balancing speed, we suppose that the average balancing current is 3 A, so the frequency can be given as follows: = 29.281 kHz = 29.281 kHZ = 14.641 kHZ = 9.760 kHZ (20) As mentioned, balancing current is inversely proportional to the frequency. However, excessive current will lead to an excessive releasing or excessive absorption of energy during one switching period.…”

Section: Frequency Value Calculationmentioning

confidence: 99%

“…To solve the deficiency, utilization of a high-performance control strategy [20][21][22][23] is essential. Fuzzy control [18] is beneficial to reduce balancing time, while Proportional Integral (PI) control [20] is an effective method to improve balancing accuracy. In order to integrate the advantages of control methods above, a Fuzzy-PI control has been shown in [20]; however, it is complex.…”

Section: Introductionmentioning

confidence: 99%

“…Fuzzy control [18] is beneficial to reduce balancing time, while Proportional Integral (PI) control [20] is an effective method to improve balancing accuracy. In order to integrate the advantages of control methods above, a Fuzzy-PI control has been shown in [20]; however, it is complex. Almost all of the control strategies are in PFM (pulse frequency modulation) mode based on the voltage difference.…”

Section: Introductionmentioning

confidence: 99%

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Balancing Control Strategy for Li-Ion Batteries String Based on Dynamic Balanced Point

Zhang

Zhu

et al. 2015

Energies

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Abstract:The Li-ion battery is becoming the optimal choice for the Electric Vehicle's (EV) power supply. In order to protect the Li-ion battery from charging damage and to prolong the battery's life, a special control strategy based on the dynamic balanced point along with a non-dissipative equalizer is presented. The main focus of the proposed control strategy is to insure that the individual cell of a battery pack will be rapidly, efficiently and simultaneously balanced, by adjusting equalizing current of each cell dynamically. In this paper, a model of a four series connected Li-ion batteries pack has been established to evaluate the proposed control strategy. Superior performance is demonstrated by the simulation and experiment.

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Section: Frequency Value Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Balancing Control Strategy for Li-Ion Batteries String Based on Dynamic Balanced Point

Zhang

Zhu

et al. 2015

Energies

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“…Recently, lithium-ion battery and super-capacitors of high output voltage with series connections are being used in many high power applications such as hybrid or pure electric vehicles and energy storage systems [1][2][3][4]. They have several pros and cons compared with the conventional lead-acid battery.…”

Section: Introductionmentioning

confidence: 99%

Cell Balancing Method in Flyback Converter without Cell Selection Switch of Multi-Winding Transformer

Kim¹,

Park²

2016

Journal of Electrical Engineering and Technology

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-This paper presents a cell balancing method for a single switch flyback converter with a multi-winding transformer. The conventional method using a flyback converter with a multi-winding transformer is simple and easy to control, but the voltage of each secondary winding coil might be non-uniform because of the unequal effective turn-ratio. In particular, it is difficult to control the nonuniform effect using turn-ratios because secondary coil has a limited number of turns. The nonuniform secondary voltages disturb the cell balancing procedure and induce an unbalance in cell voltages. Individual cell control by adding a switch for each cell can reduce the undesirable effect. However, the circuit becomes bulky, resulting in additional loss. The proposed method here uses the conventional flyback converter with an adjustment made to the output filters of the cells, instead of the additional switch. The magnitude of voltage applied to a particular cell can be reduced or increased according to the adjusted filter and the selected switching frequency. An analysis of the conventional converter configuration and the filter design method reveals the possibility of adequate cell balancing control without any additional switch on the secondary side.

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“…The voltage rating for each cell in an energy storage device (ESD) such as supercapacitors or batteries is relatively low. To allow for use in high voltage applications, many cells are series connected, which decreases the system reliability by adding a voltage equalizer to each cell [4], [5]. Therefore, it is desirable to keep the number of cells as low as possible to avoid complicated voltage equalizing circuits.…”

Section: Introductionmentioning

confidence: 99%

A Bidirectional Single-Stage DC/AC Converter for Grid Connected Energy Storage Systems

Chen¹,

Liao²,

Sha³

2015

Journal of Power Electronics

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In this paper, a unified control strategy using the current space vector modulation (CSVM) technique is proposed and applied to a bidirectional three-phase DC/AC converter. The operation of the converter changes with the direction of the power flow. In the charging mode, it works as a buck type rectifier; and during the discharging mode, it operates as a boost type inverter, which makes it suitable as an interface between high voltage AC grids and low voltage energy storage devices. This topology has the following advantages: high conversion efficiency, high power factor at the grid side, tight control of the charging current and fast transition between the charging and discharging modes. The operating principle of the mode analysis, the gate signal generation, the general control strategy and the transition from a constant current (CC) to a constant voltage (CV) in the charging mode are discussed. The proposed control strategy has been validated by simulations and experimental results obtained with a 1kW laboratory prototype using supercapacitors as an energy storage device.

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Design, Testing, and Validation of a Simplified Control Scheme for a Novel Plug-In Hybrid Electric Vehicle Battery Cell Equalizer

Cited by 205 publications

References 14 publications

Balancing Control Strategy for Li-Ion Batteries String Based on Dynamic Balanced Point

Balancing Control Strategy for Li-Ion Batteries String Based on Dynamic Balanced Point

Cell Balancing Method in Flyback Converter without Cell Selection Switch of Multi-Winding Transformer

A Bidirectional Single-Stage DC/AC Converter for Grid Connected Energy Storage Systems

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