摘要
交流系统故障会引起直流后备保护动作。首先利用开关函数法分析得出对直流后备保护影响的主要因素是交流系统负序及3次谐波分量,而负序分量是最主要因素;然后采用对称分量法对影响直流后备保护的主要因素进行分析:交流系统主要故障参数如故障类型、地点、无功补偿、短路比等发生变化时,对直流后备保护的影响是不同的,有的呈现单调性、有的随故障类型及运行方式而异;最后利用文中分析确定反时限保护的动作范围。
Faults occurred in HVAC power system will influence on backup protection of HVDC transmission system. Firstly, the analysis results based on switching function show that the main factors influencing on backup protection of HVDC transmission system are negative-sequence component in HVAC system and the third harmonic component, and the negative-sequence component is the principal factor; then the main factors influencing on backup protection of HVDC transmission system are analyzed by symmetrical component and it is found that the influences of variation of main fault parameters in HVAC system, such as fault types, position where the fault occurs, reactive power compensation and short-circuit ratio, on backup protection of HVDC transmission system are different, some are monotonic and some vary with fault types and operation modes; finally, based on the analysis result of this paper the operational range of inverse time-lag protection is determined.
出处
《电网技术》
EI
CSCD
北大核心
2011年第9期223-228,共6页
Power System Technology
关键词
交流电力系统
高压直流系统
后备保护
动作特性
故障类型
AC power system
HVDC transmission system
backup protection
operation characteristics
fault types
