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Liu D.,China Institute of Water Resources and Hydropower Research | Liu D.,Guangdong Key Laboratory of Hydrodynamic Research | Liao H.,University of Sichuan | Li L.,University of Sichuan | And 3 more authors.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2014

To testify whether large eddy simulation method can be applied to simulate the hydraulic characteristics in stilling basin with shallow-water cushion(SBSWC), a systematic comparison of calculation and experiment was conducted. It was shown that the flow regimes, velocity fields and pressures distributions obtained from LES are in good agreement with the experimental data, which indicated that it is reasonable to use LES to simulate the complex flow characteristics in SBSWC.

Han L.,Chongqing University | Wang C.-R.,Chongqing University | Wang C.-R.,Chengdu Municipal Engineering and Research Design Institute | Li H.,Chongqing University | And 2 more authors.
Dianji yu Kongzhi Xuebao/Electric Machines and Control | Year: 2015

The tolerant control strategy of three-phase four-switch inverter based on direct torque control can only solve the single-switch fault problem with the disadvantage of large torque ripple. By analyzing three-phase four-switch and six-switch inverter voltage vector characteristics, to make full use of the normal switches, the voltage vector sector and switch table at the inverter fault were reconstructed and a new kind of tolerant control strategy, three-phase six-switch tolerant control strategy, was proposed under the precondition of the same inverter topological structure and switch quantity. This new tolerant control strategy can provide six voltage vectors and one zero-voltage vector. It is better than the three-phase four-switch tolerant control strategy which has only four voltage vectors to choose. Furthermore, the possible cascading faults of three-phase six-switch were analyzed and the corresponding tolerant control strategy was proposed. The simulation results show that the new tolerant control strategy proposed has more advantages such as effectively reducing the torque ripple and adaptability for the cascading faults. ©, 2015, Editorial Department of Electric Machines and Control. All right reserved.

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