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Nanjing, China

Ouyang B.,Wuhan Naval University of Engineering | Ma W.-M.,Wuhan Naval University of Engineering | Wang D.,Wuhan Naval University of Engineering | Wei K.-Y.,Unit 73681 of PLA | Zhai X.-F.,Wuhan Naval University of Engineering
Dianji yu Kongzhi Xuebao/Electric Machines and Control

Energy storage system with dual six-phase machine of great capacity is relatively complicated, and its operation procedure is transient. Therefore, it is not convenient to study the performance of such system profoundly by analytical method. Firstly, difference of winding layout between this machine and traditional 12-phase machine was described briefly; then, mathematical model was established, and the complicated electromagnetic coupling relationship inside windings of this machine was illuminated. Hereafter, its simulation codes were developed by implicit trapezoid iterative method. The block diagram of the exciter controller was described briefly, and exciter speed was locked with the speed of main generator by speed synchronous algorithm. Finally, the simulation codes of the whole system were developed in PSCAD/EMTDC. A load condition was simulated, in which the duty ratio of inverter was constant. The accuracy of the model and the validity of the proposed method are confirmed by comparisons between the experimental test results and simulation results. Source

Wei K.,Unit 73681 of PLA | Xu J.,Unit 73681 of PLA | Han H.,Unit 73681 of PLA | Jiang Y.,Nanjing University of Information Science and Technology
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society

Results of experiment and simulation show that low-frequency oscillation will come forth in a standalone generator-rectifier system with capacitor-resistor load when its system parameters are not reasonable. This paper detailedly studies the issue by the methods of theory computation, experiment and simulation. The system state-space model must be built firstly to finish the theory computation, which includes the simplified 2-dimension model of generator, the dynamic average-value model of diode-bridge rectifier and dynamic model of load. Then the small-signal model of system will be obtained by the linearing method at a steady-state operation point. And finally the eigenvalue theory is used to estimate the system stability. On the ground of the experiments, simulations and theory computation, this paper summarizes the law of steady-state stability of such system, analyzes the physics mechanism, and presents the control methods for the issue from points of view of parameters and controller. Source

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