Sichuan Electrical Power Design Consulting CO.

Chengdu, China

Sichuan Electrical Power Design Consulting CO.

Chengdu, China
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Liu H.,Sichuan University | Liu N.,Sichuan University | Pu L.,Sichuan University | You S.,Sichuan Electrical Power Design & Consulting Co. | And 2 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2016

Based on transient short-circuit current calculation methods and finite element method (FEM), the calculation process of the short-circuit forces for high voltage large-sectional cables is analyzed. And the short-circuit forces calculation formula for cleats of high voltage large cross-sectional cable is gotten. Within the formula, the snake-like layout of the cable, the mediums cushion effect at the outer conductor, and the cable movement are taken into consideration. Moreover, the coefficients K1 and K2 are introduced to modify the expression of the cable cleat force caused by 50 Hz and 100 Hz frequencies respectively. The 3D finite element calculation model of the cable cleat system is established based on ANSYS. Then the effect of span spacing and phase spacing on the cable cleats stress field has been studied. At the same time, the 220 kV power cable transmission line between Shuang Qiaozi and Tao Xiang has also been calculated. As can be seen from the simulation results, the maximum value of the stress is in the middle of the bolt. So it is most easy to deform or be pulled apart. The span and phase spacing should satisfy the standard l≤2.7 m, 0.28 m≤a≤0.30 m separately for 220 kV power cable transmission lines which are laid in parallel. © 2016, The editorial office of Transaction of China Electrotechnical Society. All right reserved.


Gao S.,Southwest Jiaotong University | Gao S.,Sichuan Electrical Power Design & Consulting Co. | Liu Z.-G.,Southwest Jiaotong University | Dai C.-X.,Southwest Jiaotong University | Hu K.-T.,Southwest Jiaotong University
Tiedao Xuebao/Journal of the China Railway Society | Year: 2015

To deal with the disadvantages of existing expert systems in the diagnosis of faults of traction power supply systems, a method of model-based diagnosis was applied to the fault diagnosis of traction power supply systems. For each part of the traction power supply system, such as catenary, positive feeder and buses, the model-based method was used to build a two-layer abstract model with voltages and currents as variables. The fault simulation of Yongle Section in Beijing-Tianjin Intercity Railway was used to describe the methods to realize the key steps in the diagnosis process, such as the recognition of the minimal conflict sets, the acquisition of the fault diagnosis candidates and the fault matching. The diagnosis results showed that the model-based method can diagnose system faults quickly and accurately. Meanwhile a strategy was proposed to avoid the influence caused by the measurement device failure. The experimental results showed that the diagnosis system with the proposed strategy can still diagnose the system fault quickly when the failure of the measurement device causes the error of the measuring data. ©, 2015, Science Press. All right reserved.


Li R.,Southwest Jiaotong University | Cao X.,Southwest Jiaotong University | Zhang X.,Sichuan Electrical Power Design & Consulting Co. | Chen K.,Southwest Jiaotong University | Shen J.,Texas Instruments
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2015

A simulation model of back-flashover resistance level is built based on PSCAD/EMTDC for ±800 kV/500 kV AC-DC hybrid transmission lines and the effect of tower grounding resistance, insulator piece quantity, lightning waveform, tower height and lightning arrester on the back-flashover resistance level is discussed. The effect of grounding resistance on the level is emphatically analyzed from the aspect of shunt coefficient. The back-flashover resistance level of ±800 kV/500 kV AC-DC hybrid transmission lines is compared with that of 500 kV dual-loop lines on same tower and that of ±800 kV DC line respectively. The theoretical analysis shows that: as the ±800 kV/500 kV AC-DC hybrid transmission lines, the back-flashover resistance level of its ±800 kV line is above two times higher than that of its AC 500 kV line, while the back-flashover resistance level of its AC and DC line is higher than that of stand-alone ±800 kV DC line and 500 kV dual-loop lines respectively;the back-flashover resistance level drops abruptly when the grounding resistance reaches a certain value. ©, 2015, Electric Power Automation Equipment Press. All right reserved.


Wang T.,Southwest Jiaotong University | Wei X.,Sichuan Electrical Power Design & Consulting Co. | Xu J.,Southwest Jiaotong University | Wang X.,Southwest Jiaotong University
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2015

Aiming at the control stability problem caused by the converter input saturation of the D-PMSG (Direct-driven Permanent Magnetic Synchronous Generator) with big inertia moment and uncertain model parameters, an adaptive control strategy considering both the input saturation and the uncertainty of loss torque is proposed based on the Lyapunov stability theory, which realizes the fast MPPT(Maximum Power Point Tracking) to improve the capture efficiency of wind energy at low wind speed stage. Simulations are carried out to verify the effectiveness of the proposed adaptive control strategy and results show that, it ensures the system stability during the input saturation and the speed tracking effect to realize the MPPT, with quick response and small overshoot. ©, 2015, Electric Power Automation Equipment Press. All right reserved.


Zhou J.,China University of Mining and Technology | Chen Y.,China University of Mining and Technology | Chen Y.,Sichuan Electrical Power Design & Consulting Co. | Tang H.,China University of Mining and Technology | And 2 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2016

To avoid the short circuit of the bridge, the dead-time is often added, which causes the drop of the output capability and the distortion of the output waveforms, and needs to be compensated. The dead-time compensation of the four-leg inverter is hard to be implemented due to its multiple switch states and complex voltage vectors distribution. The forming mechanism of the dead-time effect is firstly analyzed. Then the relevance between the currents polarities and the corresponding compensation methods are generalized. Afterwards a dead-time compensation strategy based on pulse-tuning for four-leg inverters is obtained. This compensation strategy has consistency in specific currents polarities. So it is easy to be implemented. The compensation method is determined as long as the currents polarities are distinguished. The dead-time effect is compensated by correcting the duty factors of the base vectors. Simulation and experiment results prove that the proposed compensation strategy is effective in both balanced and unbalanced situation, can raise the output capability, and reduce the waveform distortion. © 2016, The editorial office of Transaction of China Electrotechnical Society. All right reserved.


Fang Z.,Hunan University | Wang C.-L.,Hunan University | Zhang H.-Q.,Sichuan Electrical Power Design & Consulting Co. | Zhang K.-Y.,Hunan University | Xiang Y.,Hunan University
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2016

In order to develop a bond-type anchorage for the carbon fiber reinforced polymer/plastic (CFRP) strand, the bonding behavior of CFRP strand embedded in ultra-high performance reactive powder concrete (RPC) was investigated by static test. Based on the test results, the efficient anchoring modes of CFRP strands in RPC as well as the equations to calculate the interface average bond strength and the critical anchorage length of CFRP strands under different anchoring systems were proposed. The results show that the anchoring mode of CFRP strand in anchoring section has a significant influence on its anchoring performance. The anchoring efficiency of the strand can be significantly improved by decentralizing the CFRP and using single strand to anchor separately strands within the bonding length; the twisted mode of circumjacent wire in CFRP strand is beneficial for its bonding anchorage with RPC but its tensile strength becomes lower. For the CFRP strands with a tensile strength of 2 470 MPa anchoring in the RPC with a compressive strength of 128.8 MPa, the critical anchorage lengths are 120 mm for the single centric wire, 114 mm for the single circumjacent wire, 106 mm for the decentralized CFRP strand and 231 mm for the whole anchored CFRP strand, respectively. Adding steel fibers by less than 2% of the total volume into the RPC has no obvious influence on the bonding behavior between CFRP strands and RPC. © 2016, Editorial Department of China Journal of Highway and Transport. All right reserved.


Zhou L.,Chongqing University | Ren W.,Chongqing University | Liao B.,Sichuan Electrical Power Design & Consulting Co. | Chao Y.,Chongqing University | And 2 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2015

Grid-connected PV plants should have independent control of reactive power to support the grid. The equivalent aggregation model of large-scale photovoltaic (PV) plants is established firstly. With the existence of the line and transformer impedance, the grid voltage stability is reduced caused without the reactive power compensation device in PV plants and reactive power of the inverter. The three-level reactive power control strategy is proposed based on the cooperated control between the reactive power compensation device and the inverter. The strategy coordinates the reactive power output among the reactive power compensation devices, PV generation unit and inverters, which regulates the voltage very effectively. Then the grid active and reactive power losses can be minimized while maintaining the voltage in the required range. In order to ensure the stable operation of the grid, the PV array carries out lower power operation strategy when the reactive power output of PV plants is fixed. Moreover, the validity and the effectiveness of the method are validated by means of simulation results. © 2015, The editorial office of Transaction of China Electrotechnical Society. All right reserved.


Han R.B.,Southwest University of Science and Technology | Han R.B.,University of Sichuan | Xu Z.M.,Sichuan Electrical Power Design Consulting CO. | Long E.S.,University of Sichuan | Wang Y.,University of Sichuan
Applied Mechanics and Materials | Year: 2013

The energy-saving reconstruction for the existing building is very important for the large number of existing buildings in China. The energy-saving reconstruction in the roof is the key of the building energy-saving construction, and also the inevitable way for improving the urban heat island effect and comfort of the top-floor rooms. The energy-saving roof can be divided into two types including passive cooling and proactive cooling. This article analyzes the advantages and disadvantages of the two types before coming up with the ways and expectation for the energy-saving construction of the existing building roof. © (2013) Trans Tech Publications, Switzerland.


Xing J.,North China Electrical Power University | Xing J.,Sichuan Electrical Power Design & Consulting Co. | Li Q.,North China Electrical Power University | Cong H.,Shandong University | And 3 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2016

A physical simulation platform of the secondary arcs with long-distance transmission lines was established, and the high-speed camera recorded the motion development process of the secondary arcs. During the motion process of the secondary arc, the anode arc root had obvious jump phenomena, the arc length usually became short, the arc length increased dramatically before the arc extinguished. In order to clarify the inherent mechanism of the above phenomena, an arc chain model was adopted to simulate the secondary arcs with long-distance transmission lines. The results showed that the arc root jumping was closely related to the thermal buoyancy and electrode structure. The arc root jumping frequency significantly reduced when the electrode structure was horizontal, which would facilitate the arc extinguishing. Arc length temporarily became short because of the short circuit between the arc column, while the secondary current suddenly became bigger before the arc extinguished would increase the arc length dramatically. The wind load was in a dominant position in all forces and the dispersion of arcing time was small when the wind speed was big. The results also found that the motion of the secondary arc was more complex and the arc was more likely to go out under the condition of wire perpendicular. © 2016, The editorial office of Transaction of China Electrotechnical Society. All right reserved.


Liu H.,China Electric Power Research Institute | Han J.,China Electric Power Research Institute | Sun Z.,Sichuan Electrical Power Design & Consulting Co. | Yang J.,China Electric Power Research Institute | And 2 more authors.
International Journal of Steel Structures | Year: 2015

To include the effects of the joint zones efficiently, firstly a chord member considering the joint zones is seen as a combination of three beams with different sections and its element stiffness matrix is derived; Secondly, based on the statistically geometrical properties of the joint zones and chord members in service, the coefficients in the element stiffness matrix of the varied section beam element related to the moments and shear forces greatly increase more than 70%, while the coefficients related to axial forces only increase less than 2%. Therefore, along with the other two inherent mechanical properties of member structures, it is essential to include the effects of the joint zones. Finally, the results by the finite element models where the chord members and the joint zones are simulated by four methods are compared, which proves the efficiency and the accuracy of the varied section beam element. © 2015, Korean Society of Steel Construction and Springer-Verlag Berlin Heidelberg.

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