摘要
针对同调等值法等值过程中各个环节存在的若干问题,提出了相应的实用化解决方法:通过母线电压波动曲线的相关性分析,基于母线电压同调辨识出外网保留节点;针对网络化简过程中出现的不符合物理规律的参数,采用人工删除高阻抗支路并适当微调附近节点上的负荷参数,或将负电阻参数调整为0使负电阻提供的有功功率分配到线路两端节点上,并调整两端节点有功负荷进行修正,从而提高动态等值精度。针对等值后动态响应效果,提出了分时段量化评估方法。以南方电网为实例,分析验证了所提方法的有效性。
Corresponding practical methods are proposed to solve the problems existing in different procedures of coherency-based equivalence. Correlation analysis is carried out for the bus voltage curves and the external nodes to be preserved are identified according to the bus voltage coherency. Different countermeasures may be applied to treat the unreasonable network parameters appeared during the process of network simplification：delete manually the branch with high impedance and fine-tune appropriately the load parameters of nearby nodes ;adjust the negative resistance parameters to 0,distribute the reactive power provided by the negative resistors to both nodes of the line and adjust their active loads appropriately to improve the accuracy of dynamic equivalence. The time-division quantitative evaluation is proposed to assess the dynamic performance after equivalence. The practical example of South China Power Grid verifies the efficiency of the proposed methods.
出处
《电力自动化设备》
EI
CSCD
北大核心
2013年第2期120-125,共6页
Electric Power Automation Equipment
关键词
动态等值
节点保留原则
动态效果评价
交直流大电网
电力系统
dynamic equivalence
node preservation principle
dynamic performance evaluation
AC-DC system
electric power systems
