摘要
Compared with traditional synchronous generators, wind turbine generators are different in electricity generation principles, control modes and integration topologies, which makes their fault characteristics change a lot. This, consequently, brings challenges regarding the behavior of protections for wind farm collector systems. In this paper, based on a practical wind farm, configuration and setting of relay protections for such a collector system is analyzed and determined systematically in consideration of the selectivity and sensitivity of the protections. Results show that misoperation of overcurrent relay and zero sequence overcurrent relay of the non-fault collector line occurs, and bus differential relay of collector bus cannot remove the single-phase-to-ground fault. In order to solve the problems, a novel substation-area protection for collector system is proposed and its operation mechanism is discussed.
Compared with traditional synchronous generators, wind turbine generators are different in electricity generation principles, control modes and integration topologies, which makes their fault characteristics change a lot. This, consequently, brings challenges regarding the behavior of protections for wind farm collector systems. In this paper, based on a practical wind farm, configuration and setting of relay protections for such a collector system is analyzed and determined systematically in consideration of the selectivity and sensitivity of the protections. Results show that misoperation of overcurrent relay and zero sequence overcurrent relay of the non-fault collector line occurs, and bus differential relay of collector bus cannot remove the single-phase-to-ground fault. In order to solve the problems, a novel substation-area protection for collector system is proposed and its operation mechanism is discussed.
基金
supported by the National High-tech R&D Program of China(863 Program)under the Grant 2012AA050208
"111 project"under the Grant B08013
the Fundamental Research Funds for the Central Universities under the Grant 2014QN20
