Yancheng Institute of New Energy Vehicles of Southeast University

Yancheng, China

Yancheng Institute of New Energy Vehicles of Southeast University

Yancheng, China
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Ding S.,Nanjing Southeast University | Ding S.,Anhui University | Cheng M.,Nanjing Southeast University | Cheng M.,Yancheng Institute of New Energy Vehicles of Southeast University | And 3 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2013

The ultracapacitor is a novel efficient energy storage device. The voltage of single ultracapacitor is very low, so the ultracapacitors should be connected in series when they are used in the application for EV. Therefore, the voltage of each single unit needs maintain the consistency in order to ensure the safety and efficiency. The voltage equalization techniques of ultracapacitor are investigated in this paper at first, then an improved "flying-capacitor" technology with power switching network and single high capacity electrolytic-capacitor is proposed for the equalization of ultracapacitors. The proposed voltage equalization technologies are validated by both the simulation and the experiments.


Ding S.,Nanjing Southeast University | Ding S.,Anhui University | Cheng M.,Nanjing Southeast University | Cheng M.,Yancheng Institute of New Energy Vehicles of Southeast University | And 5 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2013

A novel multilevel inverter based on partial-charging of the DC capacitor is proposed in this paper. By using the partial-charging circuits for the DC capacitor, the voltage is boosted in the DC link, which in turn generates the multilevel AC output voltage with the cooperation of an inverter circuit and its control strategy. Compared to the traditional multilevel inverters, the proposed multilevel inverter offers multiple voltage stairs more flexibly with less power devices. Meanwhile, the THD of the output voltage is significantly reduced. Both simulation and experiment results are given to verify the validity of the proposed multilevel inverter, and confirm its good operating performance.

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