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Wang X.,Changsha University of Science and Technology | Li D.,Changsha University of Science and Technology | Mai X.,Changsha University of Science and Technology | Li X.,Puyang Power Supply Company
Proceedings of the 5th IEEE International Conference on Electric Utility Deregulation, Restructuring and Power Technologies, DRPT 2015 | Year: 2015

Aiming at the DC power supply instability in micro-grid, a Flywheel Energy Storage System (FESS) based on magnetic integrated structure bidirectional DC/DC converter is proposed. In this system, for the converter, three magnetic elements (isolation transformer, resonant inductor and transformer) are integrated into a single core via magnetic integrated technology. The FESS can not only supply the energy shortfall of micro-grid, but also stabilize the voltage of DC bus, improve power quality and reliability. A DC/DC converter 10kW prototype with 460-560V input and 320V output is produced. Through experimental analysis, the project has the advantages of less components, smaller size etc, and can reduce the current ripple effectively, will be suitable for high power applications. © 2015 IEEE.

Chao D.,East InnerMongolia Electrical Power Company. LTD. | Yang J.,Puyang Power Supply Company | Su S.,Huazhong University of Science and Technology | Shi D.,Huazhong University of Science and Technology
Dianwang Jishu/Power System Technology | Year: 2011

The information on faults occurred in Puyang distribution network is extracted, and analysis results of the information shows that the time series of faults possess evident long-term self-correlation and its probability distribution shows up power-law distribution characteristics, so the faults occurred in Puyang distribution network possess self-organized criticality (SOC). Weather factor greatly influences on faults of distribution network, and according to the analysis of the fault causes it is found that the SOC of precipitation phenomena in atmosphere system is the determinative factor of SOC of faults occurred in distribution network of this region.

Xia C.-Y.,China University of Mining and Technology | Li C.-W.,Puyang Power Supply Company | Zhang J.,Chongqing University
Proceedings 2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011 | Year: 2011

The capacitive power transfer (CPT) system and inductively power transfer (IPT) system are the two typical wireless power transfer systems. Based on the power transmission characteristics, the power transfer capacity of the two wireless power transfer system was analyzed. Firstly, the maximum power transfer capacity and its existing condition of the two types of wireless power transfer system were analyzed, and the choose gist of wireless power transfer system was presented according to the analysis result; then, the parameters of the two types of wireless power transfer system were optimized for achieving maximum power transfer; finally, the theoretical research was justified via a simulation. © 2011 IEEE.

Zhang M.G.,Lanzhou University of Technology | Wang D.B.,Lanzhou University of Technology | Zhang Z.K.,Puyang Power Supply Company
Applied Mechanics and Materials | Year: 2013

The mathematical model of voltage source converter-based flexible DC transmission system(VSC-HVDC) and traditional fault control strategy are comprehensively analyzed. The proportional resonant controller in the traditional dual vector current controller is proposed to simplify the structure of traditional inner current controller. The proposed method improves the response speed and control accuracy of the control system. According to the output voltage distortion caused by the DC voltage ripple, the PWM with amplitude-adjustable carrier is adopted, and according to the DC side voltage rise the power setting value is adjusted. Finally, the control strategy is verified by the electromagnetic transient simulation software PSCAD/EMTDC, the simulation results show it can effectively restrain the fault overvoltage, improve the operation ability of the system. © (2013) Trans Tech Publications, Switzerland.

Zhu X.-L.,North University of China | Zhang Y.,North University of China | Li Q.,China Electric Power Research Institute | Rao C.-H.,Puyang Power Supply Company | Zhang Z.-A.,China Electric Power Research Institute
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

To solve the problem of node voltage out-of-range and the voltage stability worsening existing in large-scale wind power integration, a new method is proposed to determine the optimum capacity of wind power integration into power system, which uses genetic algorithm to analyze the steady-state operation of power system, combined with typical wind velocity disturbance and fault mode to check the transient stability of system. An actual power system are used to test feasibility and availability of the proposed method. Test results show that using the method proposed in this paper to determine the optimum capacity of wind power integration can make voltage of each node acceptable, and the bus voltage of wind farm booster station and parallel point approach rating value. The influence on system stability of wind power integration is reduced during steady-state operation. System and wind farm itself can keep stable during transient state.

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