Zhihua Zhan

Research on dynamic simulation of the resonance fault current limiter

The resonance fault current limiter (RFCL), which avoids the disadvantages of the series reactor, is feasible for EHV and UHV grid. To contribute to project application of the RFCL, and study its running characteristic and impact on relay protection, the dynamic simulation lab of State Grid simulation center carries out the research on simulation technique for RFCL. The principle and technical properties of RFCL applied in EHV power transmission line are analyzed. Considering the features of dynamic simulation system in the lab, the approach to choose parameters of simulation model and corresponding structural design are described. This simulation model has been connected into dynamic simulation system and the simulation experiments for inspecting the control and protection function of RFCL are performed. Experimental results show that the performances of the developed simulation model for RFCL can meet the design requirement, and can be applied in dynamic simulation tests and researches.

The influences and countermeasures of wind farm access to transmission line differential protection

Large-capacity wind power will have impact on transmission line protection when short circuit occurs. This paper built the dynamic simulation model of different wind turbine generator through physical devices, and tested through operation and faults. By analysis of characteristics of wind farm model, this paper analyzed the influences of wind power to transmission line differential protection and proposed countermeasures to adapt and overcome the problem.

Relay adaptive testing research in smart substation process level based on EPON network

Through describe the principles and characteristics of EPON network, Proposed EPON communications network applying smart substation process level, and test the adaptability of protection under the EPON network. The paper has constructed smart substation relay protection dynamic simulation model test platform based on EPON network. Selecting 220kV smart substation busbar protection, transformer protection, line protection for test object, and analyzed the test results. The result shows that relay protection operation performance has not affected by the process layer by using EPON network. The research work can provide the basis for the smart substation layer applying EPON network and the subsequent technology Application.