Entity

Time filter

Source Type


Zhang Z.-H.,China University of Petroleum - East China | Zhang Z.-H.,Shandong University | Xu B.-Y.,Shandong University | Xu B.-Y.,Shandong Kehui Electrical Co Ltd | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012

The closed loop distribution network of double sources is the basis of realizing the seamless fault self-healing of distribution network fault, but the power flow has the characteristic of natural distribution and is lack of effective control means. We adopt united power flow controller (UPFC) to research the power flow control methods. Based on analyzing the power flow distribution and control regularity with the normally closed loop distribution, and taking the load node voltage deviation and closed loop feeder power output limit as constraints, we deduce the optimal power flow control scheme in the condition of minimum active power output by UPFC when the power regulation variables are fixed. The control method can ensure the economy of UPFC application while meeting the flexible regulation of power flow. Considering the issue of unequal output at two sides, we establish a simulation model for the closed loop distribution network of double sources. Simulation results show that the method is effective. Source


Sun B.,Shandong University | Sun T.-J.,Shandong University | Xue Y.-D.,China University of Petroleum - East China | Xu B.-Y.,Shandong Kehui Electrical Co Ltd
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

A new transient direction protection principle using zero-module combination admittance is presented for non-solidly earth fault. In selected frequency band (SFB), ratio of algebraic addition of single frequency zero-module reactive power to that of the reactive power caused by zero-module voltage and zero-module current of same frequency in the whole frequency band is taken as weighted coefficient of zero-module addimitance, and the weighted integral of single frequency zero module admittance in the whole frequency band is considered as transient combination admittance. The fault direction is determined by calculating zero-module combination admittance angle. According to the different fault directions, the fault line selection and earth fault location can be realized. In the end, simulation results and field data demonstrate the feasibility of the approach. Source


Duan J.-J.,Shandong University of Technology | Xue Y.-D.,Shandong Kehui Electrical Co Ltd | Xu B.-Y.,Shandong Kehui Electrical Co Ltd
IET Conference Publications | Year: 2010

In view of the special structural characteristics of traction power supply system, the paper proposed a new method based on the principle of double-ended voltage travelling waves to make fault location. Double-ended travelling waves fault location avoids the drawbacks of impedance method, and it makes huge significance to the high-speed electrified railway of China. Application system of this method has been put into trial operation and the results are good. Source


Xue Y.-D.,Shandong Kehui Electrical Co Ltd | Sun B.,Shandong University | Xu B.-Y.,Shandong Kehui Electrical Co Ltd | Duan J.-J.,Shandong Kehui Electrical Co Ltd
IET Conference Publications | Year: 2010

A new approach using transient signals for earth fault location in non-solidly earthed overhead lines is presented. The characteristics of zero module network are analyzed in detail. Also, the product of zero-module voltage after Hilbert transform and zero-module current in selected frequency band is determined the direction of the fault. The earth fault can be located in accordance with the difference of fault directions before and after fault. The paper proposes to use electromagnetic field induction to acquire fault signals. Source


Gao M.,Shandong University | Xu B.,Shandong University of Technology | Xu B.,Shandong Kehui Electrical Co Ltd
2010 China International Conference on Electricity Distribution, CICED 2010 | Year: 2010

A new overcurrent fault isolation technology in distribution line based on network is presented. The FTU detects fault and exchanges fault data with the adjacent FTUs by peer-to-peer communication technology. The FTUs at both ends of the faulted section will trip the circuit breakers to isolate the fault. Then FTU at the tie breaker will close the tie breaker to restore supply. © 2010 Chinese Soc for Elec Eng. Source

Discover hidden collaborations