特高压直流分层接入方式下稳态特性研究  

Steady-state characteristics of UHVDC hierarchical connection mode

作　　者：付蓉[1] 孙万钱 汤奕[2] 周振凯[1] FU Rong SUN Wanqian TANG Yi ZHOU Zhenkai(College of Automation,Nanjing University of Posts and Telecommunications,Nanjing 210023,China School of Electrical Engineering, Southeast University, Nanjing 210096, China)

机构地区：[1]南京邮电大学自动化学院,江苏南京210023 [2]东南大学电气工程学院,江苏南京210096

出　　处：《电力自动化设备》2017年第1期81-86,共6页Electric Power Automation Equipment

基　　金：江苏省电力公司科技项目(5210EF14001P)~~

摘　　要：探讨了特高压直流分层接入方式下交流系统逆变侧换流母线间电压相互作用影响关系的求解方法,并得出相互作用因子数学表达式。通过PSCAD仿真验证了所求的相互作用因子的准确性。分析了分层接入时,2组换流器采用不同控制方式时对相互作用因子的影响。根据所求的相互作用因子,得出分层接入时系统短路比。特高压直流分层接入方式下,在保持直流输电总功率不变的同时,当分层接入不同的受端系统时,可以使总功率在1000 kV与500 kV两级电网重新分配。最后分析了潮流重新分布时,特高压直流分层接入方式对系统换流器换相失败的影响。The method for solving the voltage interaction relationship among commutation buses in the UHVDC（Ultra High Voltage DC） hierarchical connection mode is discussed and the mathematical expression of MIIF（Multi-Infeed Interaction Factor） is obtained. The accuracy of MIIF is tested by PSCAD simulation. The effect of two converters adopting different control modes on the MIIF in UHVDC hierarchical connection mode is analyzed. The system SCR（Short Circuit Ratio） is calculated according to the MIIF. In the UHVDC hierarchical connection mode,when different receiving systems are hierarchically connected,the total DC power can be reallocated between 1 000 kV and 500 kV grids while it is maintained constant. The impact of UHVDC hierarchical connection mode on the commutation failure during the power flow redistribution is analyzed.

关 键 词：特高压直流分层接入方式 特高压输电 直流输电 相互作用因子 PSCAD 潮流分布 换相失败 

分 类 号：TM72[电气工程—电力系统及自动化]