Jiangxi Electric Power Research Institute

Nanchang, China

Jiangxi Electric Power Research Institute

Nanchang, China
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Jiangxi Electric Power Research Institute, Pei, Sun, Zhang, Hu and Zhu | Date: 2015-01-07

A multi-node synchronous on-site test method, the method comprising: using GPS time as time reference, and conducting synchronous on-site tests on the devices to be tested and systems distributed at different places at an appointed time; controlling the synchronous phase control simulation devices distributed at multiple nodes via a synchronous test control center; within a uniform time section, synchronously outputting secondary side AC simulation signals, and simulating various actual operating conditions, thus achieving the detection of the monitoring and control performances of various dynamic monitoring and control systems, and ensuring the normal functions of the systems. The method of the present invention is able to conduct multi-node dynamic simulation test with synchronized GPS time, and achieves the detection of large-area multi-node monitoring and control systems. The present invention is suitable for the test of a wide area measurement system (WAMS) function, the simulation test of a damping control function, the simulation test of transiently stable state analysis and control functions, the simulation test of voltage stabilization and control functions, the simulation test of an islanding control function, the simulation test of wide area protection system functions and the like.


Liu Z.,South China University of Technology | Wen F.,Zhejiang University | Xue Y.,State Grid Electric Power Research Institute of China | Xin J.,Jiangxi Electric Power Research Institute
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

A two-step screening method with the environmental factors and service radius of electric vehicle charging stations considered is presented to identify the candidate sites of electric vehicle charging stations. A mathematical model for optimizing electric vehicle charging stations is developed and solved by a modified primal-dual interior point algorithm. This model takes the minimization of electric vehicle charging stations total cost (including investment cost, operation cost and maintenance cost) and the network loss cost as the objective function, and some related constraints are considered. The modified IEEE 123-node distribution system illustrates the essential features of the developed model and algorithm. © 2012 State Grid Electric Power Research Institute Press.


Yao W.,Zhejiang University | Zhao J.,Zhejiang University | Wen F.,Zhejiang University | Xue Y.,State Grid Electric Power Research Institute of China | Xin J.,Jiangxi Electric Power Research Institute
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

The extensive integration of numerous plug-in electric vehicles (PEVs) into a power system could produce significant negative impacts on the secure and economic operation of the power system concerned, if the charging procedures of PEVs are uncoordinated. Given this, the hierarchical and zonal dispatching architecture is adopted and a new bi-level optimization model is presented for coordinating the charging/discharging schedules of the PEVs. The upper-level model is devoted to minimizing the system load variance so as to implement peak load shifting by dispatching each electric vehicle aggregator (EVA), and the lower one is aimed at tracing the dispatching scheme determined by the upper decision-maker through figuring out an appropriate charging and discharging schedules throughout a specified day. Two highly efficient commercial solvers, AMPL/IPOPT and AMPL/CPLEX respectively, are employed to solve the developed optimization problem. Finally, a modified IEEE 30-bus system with 5 EVAs is employed to demonstrate the basic characteristics of developed model and method. © 2012 State Grid Electric Power Research Institute Press.


Yuan D.,Hubei University | He W.,Wuhan University | Pei F.,Jiangxi Electric Power Research Institute | Wu F.,Jiangxi Electric Power Research Institute | And 5 more authors.
Journal of Materials Chemistry A | Year: 2013

Stable Na+ ion storage cathodes with adequate reversible capacity are now greatly needed for enabling Na-ion battery technology for large scale and low cost electric storage applications. In light of the superior Li+ ion storage performance of layered oxides, pure P2-phase Na 0.67[Mn0.65Ni0.15Co0.2]O 2 microflakes are synthesized by a simple sol-gel method and tested as a Na+ ion storage cathode. These layered microflakes exhibit a considerably high reversible capacity of 141 mA h g-1 and a slow capacity decay to 125 mA h g-1 after 50 cycles, showing much better cyclability than previous NaMnO2 compounds. To further enhance the structural and cycling stability, we partially substituted Co3+ by Al3+ ions in the transition-metal layer to synthesize Na 0.67[Mn0.65Ni0.15Co0.15Al 0.05]O2. As expected, the Al-substituted material demonstrates a greatly improved cycling stability with a 95.4% capacity retention over 50 cycles, possibly serving as a high capacity and stable cathode for Na-ion battery applications. © 2013 The Royal Society of Chemistry.


Wu L.,Wuhan University | Hu X.,Hubei University | Qian J.,Hubei University | Pei F.,Jiangxi Electric Power Research Institute | And 5 more authors.
Energy and Environmental Science | Year: 2014

Sb-C nanofibers are synthesized successfully through a single-nozzle electrospinning technique and subsequent calcination. The structural and morphological characterizations reveal the uniform nanofiber structure with the Sb nanoparticles embedded homogeneously in the carbon nanofibers. Electrochemical experiments show that the Sb-C nanofiber electrode can deliver large reversible capacity (631 mA h g-1) at C/15, greatly improved rate capability (337 mA h g-1 at 5 C) and excellent cycling stability (90% capacity retention after 400 cycles). The superior electrochemical performances of the Sb-C nanofibers are due to the unique nanofiber structure and uniform distribution of Sb nanoparticles in carbon matrix, which provides a conductive and buffering matrix for effective release of mechanical stress caused by Na ion insertion/extraction and prevent the aggregation of the Sb nanoparticles. This journal is © 2014 The Royal Society of Chemistry.


Zhao J.,Zhejiang University | Wen F.,Zhejiang University | Yang A.,South China University of Technology | Xin J.,Jiangxi Electric Power Research Institute
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

The technical, economic, environmental and policy background associated with the fast development of electric vehicles (EVs) are first clarified, followed by a review of the impacts of the extensive integration of numerous EVs on the power system concerned. The available dispatching and control methods relevant with EVs are next clarified. Then, suggestions are made about research work in the evaluation of the economic impacts of EVs on the power system, the dispatching problem and the optimization algorithm associated, as well as the charging and discharging control problem. © 2011 State Grid Electric Power Research Institute Press.


Lu L.,Zhejiang University | Wen F.,Zhejiang University | Xue Y.,China Electric Power Research Institute | Xin J.,Jiangxi Electric Power Research Institute
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

Introducing large-scale plug-in electric vehicle (PEV) into a power system would produce extensive impacts on power system planning, operation as well as electricity market development. Hence, it appears necessary to properly control the PEV charging and discharging behaviors. A new unit commitment model and a solving approach are developed with the optimal PEV charging and discharging controls taken into account, and the objective is to minimize a combination of the operating cost as well as CO2 emission amount of generators. A 10-unit 24-hour unit commitment problem is employed to demonstrate the feasibility and efficiency of the developed model and approach, and the impacts of the wide applications of PEV on the operating costs as well as the emission amounts of the power system examined. In addition, the impacts of different PEV penetration levels in the power system and different PEV charging modes, i. e. fully controlled charging mode, uncontrolled charging mode, delayed charging mode and continuous charging mode, on the results of the unit commitment problem are investigated. © 2011 State Grid Electric Power Research Institute Press.


Su Y.-C.,Jiangxi Electric Power Research Institute | Wang X.-M.,Jiangxi Super High Voltage Electrical Power Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

A method of panorama data acquisition scheme for the intelligent substation is proposed and implemented. A communication server is used to access various application subsystems with different structures in the substation and the received data are modeled according to IEC61850 standard. The external interface is supplied in accordance with IEC 61970 GID and IEC 61850 MMS. By this way, requirement of data acquisition in intelligent substation is satisfied. Structure and function of the communication server are demonstrated. The detailed realization method of data acquisition is also presented. The whole scheme has been realized in Xingguo digital substation in Jiangxi province.


Chen Z.,Jiangxi Electric Power Research Institute
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

The paper outlines the significance and the objective of carrying out DC anti-icing for the Jiangxi Power Grid and establishes the calculation model of DC anti-icing critical current and anti-icing time model. In accordance with the parameters of Jiangxi power transmission line above 110 kV, it calculates the critical current and the anti-icing time of the typical 110 kV, 220 kV and 500 kV transmission line of Jiangxi Power Grid.


Patent
Jiangxi Electric Power Research Institute | Date: 2012-05-02

A multi-node synchronous on-site test method, the method comprising: using GPS time as time reference, and conducting synchronous on-site tests on the devices to be tested and systems distributed at different places at an appointed time; controlling the synchronous phase control simulation devices distributed at multiple nodes via a synchronous test control center; within a uniform time section, synchronously outputting secondary side AC simulation signals, and simulating various actual operating conditions, thus achieving the detection of the monitoring and control performances of various dynamic monitoring and control systems, and ensuring the normal functions of the systems. The method of the present invention is able to conduct multi-node dynamic simulation test with synchronized GPS time, and achieves the detection of large-area multi-node monitoring and control systems. The present invention is suitable for the test of a wide area measurement system (WAMS) function, the simulation test of a damping control function, the simulation test of transiently stable state analysis and control functions, the simulation test of voltage stabilization and control functions, the simulation test of an islanding control function, the simulation test of wide area protection system functions and the like.

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