In fact, RTDS has been widely used in large power system simulation.The only limitation is the resources.If you have large enough RTDS, you can do very large system.

• >（RTDS）取得了一定的成功，已用于高压直流输电系统模拟、继电保护动作较验等场合，但对大电力系统的模拟尚须进一步改进。