In order to analyze the problems of protections and harmonics in the multi-send HVDC system with wind plants, which is a novel power grid, an approach to establish the electromagnetic transient simulation model by PSCAD/EMTDC is presented. After the ±800 kV Ningdong-Zhejiang UHVDC is put into operation, Ningxia grid will be this novel power grid. The winter peak operation mode of Ningxia grid in 2016 is studied. The simulation model is divided into three modules: AC grid, HVDC systems and wind plants. The interfaces between modules are defined. The simulation models of three modules can be established independently. The principle to divide the AC grid into different levels and modules is presented. With interfaces defined, the whole Ningxia grid is connected with the modules. The simulation results of the static performances and fault currents are compared with PSASP, and the validness of the simulation model is testified. The simulation results show that the transient performance of the wind power plants and HVDC/UHVDC can be analyzed in detail. The electromagnetic transient simulation model of the grid is very important to study the problems of protections and harmonics in such grid.