世界电力系统共同面临的现实是:经济的发展要求能源资源在更大的范围内优化配置,客观上要求电网的规模不断扩大。然而,任何一个客观事物的存在和发展都具有两重性。大电网的优势是显而易见的,能够促进能源资源的合理利用,实现输电的规模经济效益,提高电能质量和电网的安全稳定 The reality that the world’s power system faces together is that economic development requires that energy resources be optimally allocated in a larger scope and objectively requires that the size of the power grid be continuously expanded. However, the existence and development of any one objective thing have dual character. The advantages of large power grids are obvious, which can promote the rational utilization of energy resources, realize the economies of scale of power transmission and improve the power quality and the security and stability of the power grid