Sichuan Electrical Power Dispatching and Control Center

Chengdu, China

Sichuan Electrical Power Dispatching and Control Center

Chengdu, China

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Wang L.-P.,Southwest Jiaotong University | Wang L.-P.,Sichuan Electrical Power Dispatching and Control Center | Wang X.-R.,Southwest Jiaotong University | Wang W.,Sichuan Electrical Power Dispatching and Control Center | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2014

A novel accurate location of faults on power transmission line with two-end phasor measurement used in differential protection device is proposed. The new algorithm may solve the shortages such as complex calculations of calculating the hyperbolic functions, large amount of calculation with the Newton-Raphson iteration and binary search and needing accurate line parameters. The algorithm is simple in principle, it can calculate the accurate parameters of the transmission line, coefficient of asynchronous sampling and fault distance through simple complex operation. The algorithm uses the positive sequence fault component to calculate the fault distance, is able to adapt to all type of fault, and the calculation results have fast convergence and do not influenced by the transition resistance.


Wang L.,Southwest Jiaotong University | Wang L.,Sichuan Electrical Power Dispatching and Control Center | Wang W.,Sichuan Electrical Power Dispatching and Control Center | Chen J.,Sichuan Electrical Power Dispatching and Control Center | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2014

Steady current differential protection is the currently most commonly used practice for series compensated transmission lines. The current differential protection criteria for transmission lines at home and abroad are summarized, and their sensitivity in series compensated transmission lines, as well as the influence of system impedance and the degree of series compensation on protection sensitivity are analyzed. Analysis shows that the steady state of current differential protection may refuse to move for lack of sensitivity. The improvement algorithm of current differential protection using steady current can effectively solve this problem. The simulation of 500 kV series compensated ultra-high voltage transmission lines in Sichuan grid with PSCAD/EMTDC software has verified this conclusion. © 2014 State Grid Electric Power Research Institute Press

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