Chengdu Electric Power Bureau

Chengdu, China

Chengdu Electric Power Bureau

Chengdu, China
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Gao H.,Southwest Research Institute | Liu Z.,Southwest Research Institute | Wu J.,Southwest Research Institute | Zhang P.,Chengdu Electric Power Bureau
Modern Tunnelling Technology | Year: 2017

Focused on an open-cut tunnel structure near a landslide site on the Sichuan-Guizhou railway, a remote real-time monitoring system was applied to constantly monitor the rock stress, reinforcement stress and concrete stress. The monitoring system has such functions as data collection, remote data transmission, real-time display by data curves, monitoring and early-warning, etc. The monitoring data of the open-cut tunnel indicate: when the filling in of the soil above the open-cut tunnel is completed, the structural internal force tends to be stable along with a decrease of construction loading and a consolidation of the soil mass; additionally, the reinforcements and concrete on both side walls of the open-cut tunnel is presented as being tensioned outside and compressed inside, which means the structure is affected by an unbalanced pressure, and this conforms to the actual situation. Engineering practices show the force applied on an open-cut tunnel structure can be known in a timely manner by the realtime monitoring system, while the normal operation of the existing railway won't be affected-thus it is suitable for the long-term monitoring of an open-cut tunnel structure during operation. © 2017, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Zhang P.,Chengdu Electric Power Bureau
Modern Tunnelling Technology | Year: 2016

In order to meet the requirements of transport capacity, Chengdu Railway Bureau plans to increase the operating speed of some existing railways, i.e., the speed of the Dachuan-Chengdu railway will be increased from 160 km/h to 200 km/h, and the speed of the Suining-Chengdu railway will be increased from 160 km/h and 200 km/ h to 250 km/h. To ensure passenger comfort requirements after the speed-up, a single dimensional characteristic curve method was used to calculate transient pressure inside the train running in the tunnels, and the results were compared with domestic standards to select the vehicle type and verify the proposed speed. The results show that: considering the comfort standard, a CRH2 is recommended as the passenger train, allowing the operation speed of the Dachuan-Chengdu railway and the Suining-Chengdu railway to increase to 200 km/h and 220 km/h respectively; the single-track tunnel plays a controlling roll in the railway speed increase because of its small clearance area, and the passing of two trains should be avoided in the double-track tunnels to minimize the possibility of exceeding the transient pressure standard; in addition to the effects of operation speed and sectional area, more attention should be paid to the sealing property of trains regarding the speed-increase plans, and the principle of"independent dimensioning of every tunnel"should be maintained. © 2016, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Li Q.,Southwest Jiaotong University | Chen W.,Southwest Jiaotong University | Wang Y.,Nanyang Technological University | Liu S.,Chengdu Electric Power Bureau | Jia J.,Nanyang Technological University
IEEE Transactions on Industrial Electronics | Year: 2011

In order to improve the inherent drawbacks of particle swarm optimization (PSO), an effective informed adaptive PSO (EIA-PSO) algorithm that has better equilibrium characteristic between global search and local search is proposed. In this paper, an electrochemical-based proton exchange membrane fuel cell (PEMFC) mechanism model suitable for engineering optimization is developed, and a parameter-identification-technique-based EIA-PSO for this mechanism model is presented. In order to verify the validity of the advanced method, comparisons between experimental data and simulation data are carried out. The results demonstrate that EIA-PSO can make the mechanism model with identified parameters fit the experimental data with higher precision even in the presence of measurement noise. Therefore, EIA-PSO is an optional effective technique for identifying the parameters of the PEMFC mechanism model. © 2010 IEEE.


Li Q.,Southwest Jiaotong University | Chen W.,Southwest Jiaotong University | Li Y.,Southwest Jiaotong University | Liu S.,Chengdu Electric Power Bureau | Huang J.,Southwest Jiaotong University
International Journal of Electrical Power and Energy Systems | Year: 2012

In order to enhance the fuel economy of hybrid vehicle and increase the mileage of continuation of journey, a fuzzy logic control is utilized to design energy management strategies for fuel cell/battery (FC + B) hybrid vehicle and fuel cell/battery/ultra-capacitor (FC + B + UC) hybrid vehicle. The models of hybrid vehicle for FC + B and FC + B + UC structure are developed by electric vehicle simulation software ADVISOR which uses a hybrid backward/forward approach. The results demonstrate that the proposed control strategy can satisfy the power requirement for four standard driving cycles and achieve the power distribution among various power sources. The comprehensive comparisons with the power tracking control strategy which is wide adopted in ADVISOR verify that the proposed control strategy has better rationality and validity in terms of fuel economy and dynamic property in four standard driving cycles. Therefore, the proposed strategy will provide a novel approach for the advanced energy management system of hybrid vehicle. © 2012 Elsevier Ltd. All rights reserved.


Li Q.,Southwest Jiaotong University | Chen W.,Southwest Jiaotong University | Liu Z.,Southwest Jiaotong University | Guo A.,Southwest Jiaotong University | Liu S.,Chengdu Electric Power Bureau
Journal of Power Sources | Year: 2013

In order to achieve the maximum net power, the analysis for the maximum net power characterization of a proton exchange membrane fuel cell (PEMFC) system is carried out. A maximum net power control (MNPC) strategy based on an implicit generalized predictive control (IGPC) and a reference governor is proposed to keep optimal oxygen excess ratio (OER) trajectory. The IGPC based on an effective informed adaptive particle swarm optimization (EIA-PSO) algorithm is developed to solve the predictive control law and reduce the computational complexity in the rolling optimization process. The simulations of three conditional tests are implemented and the results demonstrate that the proposed strategy can track the optimal OER trajectory, reduce the parasitic power and maximize the output net power. The comprehensive comparisons based on three conditional tests verify that the MNPC-IGPC has better robust performance in the presence of large disturbances, time delay and various noises. The experimental comparison with internal control system of Ballard 1.2 kW Nexa Power Module testifies the validity of the MNPC-IGPC for increasing the net power. Hence, this proposed strategy can provide better behavior to guarantee optimal OER trajectory and the maximum net power even though the disturbances and uncertainties occur. © 2013 Elsevier B.V. All rights reserved.


Zhang X.,Yanshan University | Dong X.,Chengdu Electric Power Bureau
Dianwang Jishu/Power System Technology | Year: 2013

There are two objective functions in the proposed multi-objective economic dispatching model for low-carbon power system containing wind farms: generation cost and carbon emission. Considering economy of power system the carbon emission should be reduced; considering the risk brought by wind farms, the risk cost should be added in the generation cost; to achieve the energy-saving and carbon emission reduction, the output of wind farms should be increased while the economy of power system is ensured. The proposed multi-objective economic dispatching model for low-carbon power system containing wind farms is solved by improved multi-objective particle swarm optimization algorithm. Simulation results of IEEE 13-machine system show that the proposed multi-objective economic dispatching model is correct and effective.


Ma J.,North China Electrical Power University | Li J.,Chengdu Electric Power Bureau | Wang Z.,North China Electrical Power University | Yang Q.,North China Electrical Power University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2010

A novel wide-area back-up protection to identify fault location is proposed based on fault correlation factor (FCF). Under the normal condition of the power system, the protection correlation region (PCR) is initially formed on the basis of the network topology and the phase measurement unit (PMU) placement. By using switching information of the circuit breaker and heuristic search algorithm, the original PCR is then updated rapidly. After the fault occurs, by analyzing the fault steady state component of differential current within each PCR, the fault correlation region is confirmed and then the FCF is calculated in real time to locate the fault. The simulation results of 10-generator 39-bus system verify that this method is immune to the system operation condition and is able to rapidly, sensitively, and reliably identify fault location with limited measurement points and less computation. © 2010 Chinese Society for Electrical Engineering.


Hao W.-B.,Chengdu Electric Power Bureau | Hong X.-L.,Chengdu Electric Power Bureau
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

From the angle of smart grid development, Some current questions about the local net setting system of protective relaying are analyzed, for example net topology, parameters maintenance, setting system and device management. The general designing structure of local net setting system of protective relaying setting based on smart grid is presented. The net setting system is made up of setting compute, setting management and relay protective reconstruction. At the same time, key technology is discussed including net topology, supply power scheme, automatic open-loop, dividing line joint, automatic setting, power supply combination and relay reconstruction. The design ideas of setting system should meet the management and technology demand of local net protective relaying setting system for smart grid effectively.


Zhou S.,Chengdu Electric Power Bureau
Advanced Materials Research | Year: 2012

Research and development of embedded systems is the hot information technology and the graphical user interface (GUI) is the most important part of human-computer interaction interface. These embedded GUI system has been widely used because of its strong and powerful functionality. But many times, it is necessary to sacrifice performance for its versatility. In this paper, the embedded GUI systems based on the message mechanism is study considering the short of current embedded GUI systems. The novel method of a message-driven application framework is suggested to solve the problem of the current message mechanisms for the implementation. Meanwhile, a circular queue algorithm is given in order to achieve messaging unit. Then, the message has been classified considering of efficiency. In the end, the design example of personal assistant is given. © (2012) Trans Tech Publications.


Chang X.,North China Electrical Power University | Zhang L.,Chengdu Electric Power Bureau
Dianwang Jishu/Power System Technology | Year: 2012

On the basis of branch power transmission model, the power injected from nodes into power system is divided into two parts: one is regarded as the loss that occurs when the power is transferred from the node to the system and is expressed in network loss, and the other is regarded as the power supplied from the node to the network. Leading network loss variable into nodal power equations, the extended power equations are obtained; then the inversion of the extended Jacobian matrix is performed to obtain nodal incremental network loss. Calculation results of the proposed algorithm are not affected by the location of slack node, and the incremental network loss of active and reactive power injected from nodes, including the slack node, into power system can be solved. The effectiveness of the proposed algorithm is verified by calculation examples.

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