采用时域仿真的高压直流输电直流回路谐振特性分析  

HVDC System DC Loop Resonance Analysis Using Time Domain Simulation

作　　者：徐政[1] 裘鹏[1] 黄莹 黎小林 

机构地区：[1]浙江大学电气工程学院,杭州310027 [2]南方电网研究技术中心,广州510623

出　　处：《高电压技术》2010年第1期44-53,共10页High Voltage Engineering

基　　金：国家"十一五"科技支撑计划重大项目(2006BAA02A21)~~

摘　　要：直流输电系统设计时需要考虑直流回路的谐振特性。首先给出了任意频率下直流回路阻抗的定义,然后提出了利用测试信号法并基于时域仿真计算直流回路阻抗频率特性的方法。通过对一个典型±500 kV直流输电示例系统的分析,研究了交流系统短路比、交流侧滤波器容量和类型、换流变压器短路压降、触发控制角、直流输送功率、平波电抗器电感值、直流滤波器配置组数、直流输电线路长度以及直流系统运行模式等因素对直流回路阻抗频率特性的影响。另外,对设计中的糯扎渡-广东±800 kV特高压直流工程的直流回路谐振特性进行了分析。研究结果为通过调整直流系统不同元件参数来改变直流回路的谐振特性指明了方向。The resonant characteristics of DC loop is important in the design of HVDC projects. Therefore, the DC loop impedance at any frequency is defined, and an approach to calculate the DC loop impedance is proposed, which is based on the test signal method and time domain simulation. Through a typical ±500 kV HVDC sample system, the impacts of some important factors on the DC loop resonant characteristics are studied. Those important factors include the short circuit ratio of the AC systems, the capacity and type of the AC filters, the short circuit voltage drop of the converter transformers, the firing angle of the converters, the transmitted power of the HVDC system, the inductance of the smoothing reactor, the number of the DC filters, the length of the DC transmission line, as well as the operation mode of the HVDC system. Furthermore, based on the proposed approach, the resonant characteristics of the DC loop of the Nuozhadu-Guangdong ±800 kV UHVDC project is analyzed. The results are very useful when the DC loop resonant characteristics needs to be changed through varying the parameters of some elements of the HVDC system.

关 键 词：直流回路阻抗 时域仿真 频率特性 谐振 PSCAD/EMTDC 测试信号法 

分 类 号：TM721.1[电气工程—电力系统及自动化]