Research on Hierarchical-regional Principle and Structure of Zhejiang Power Grid

In this paper,the hierarchical and regional principles as well as the power network structure of Zhejiang power grid are researched based on the practical operation of Zhejiang power grid and experiences from home and abroad.Research are carried out in the following 6 aspects:hierarchical and regional principle,power supply ability,power transfer ability,power supply reliability,access of large capacity power plant to 220 kV power grid,configuration and operation control of voltage and reactive power,control of power system frequency,etc.Works done in this paper will be beneficial to power planning and operation of Zhejiang power grid in the near future.