关键词: 动态等值, 交直流电网, 等值原则, 实时仿真

Abstract:

There are three common used methods of dynamic equivalence, in which the coherent equivalent algorithm is the most practical in engineering. With the development of large-scale  UHV AC/DC synchronous grid, the original outside equivalent schemes have been unable to meet the practical demand of engineering. From the current practical application, only electromagnetic transient simulation has equivalent simplification demand for power grid. With the improvement of real-time simulation technology and ability, the requirements of the simulation scale are also relaxed. According to the development of power grid and real-time simulation, the new inside equivalent principle was proposed. On the basis of it,  this paper studies the equivalent level of the East China power grid in 2015. The equivalent research result shows that the East China power grid after using this equivalent principle can significantly reduce the grid scale and well maintain the load flow and transient performance of original grid, which can be applied in the electromagnetic transient real-time simulation study.

Key words: dynamic equivalence, AC/DC power grid, equivalent principle, real-time simulation