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文章就中南电力设计院与德国西门子公司合作进行的关于２００５年三峡左岸直流工程送端交流系统的动态等值研究，介绍西门子公司ＮＥＴＯＭＡＣ程序所采用的动态等值方法。文中以２００５年用于工频过电压研究的交流系统等值为例，详细阐述了该程序的等值原理和步骤，提出采用此“改进的估计等值法”能够使等值系统较好地保留原型系统的各种动态特性，有着良好的工程精度和可靠性。
This paper introduces the dynamic equivalence study of the end-to-end exchange system of the left bank DC project in 2005 in cooperation with Zhongnan Electric Power Design Institute and Siemens AG of Germany, and introduces the dynamic equivalence method adopted by Siemens company’s NETOMAC program. In this paper, taking the exchange system equivalent used in the study of power frequency overvoltage for example in 2005, the equivalent principle and procedure of the program are elaborated. It is proposed that the improved equivalent value method can make the equivalent system better Retain the various dynamic characteristics of the prototype system, has a good engineering accuracy and reliability.