摘要
由于无功容量的限制,电力系统潮流计算中经常要进行PV-PQ节点类型转换,传统转换逻辑容易引起数值振荡,甚至错误识别节点类型而导致潮流发散。针对该问题,文中提出一种非线性规划模型以改进PV-PQ节点类型转换逻辑,采用现代内点算法求解。模型以无功容量作为约束条件,通过目标函数控制系统电压,避开了节点类型转换。同时,无功的优化配置可以增强维持系统电压的能力,增大无功裕度;结合现代内点法求解,模型表现出了处理大规模和重负荷系统的优良性能。对IEEE-118系统和一个实际系统的仿真验证了该模型的优势。
Due to the restriction of reactive power capacity, the type switching between PV and PQ nodes are often necessary in power flow calculation of power system, however, the numerical oscillation are often caused by traditional switching logic that leads to the divergence of power flow. To overcome this difficulty, the authors propose a nonlinear programming model solved by modem interior point algorithm to improve the type switching logic between PV and PQ nodes. Taking reactive power capacity as constraint condition, the proposed model controls system voltage by objective function, thus the type switching between PV and PQ nodes can be avoided. Meanwhile, the optimal configuration of reactive power can enhance the ability to maintain system voltage level and enlarge the reactive power margin. Using modem interior point algorithm for the solution, the proposed model is indicative of premium properties in coping with large-scale and heavy loaded power system. The superiority of the proposed model is verified by simulation results of IEEE 118-bus test system and an actual power system.
出处
《电网技术》
EI
CSCD
北大核心
2009年第3期29-32,43,共5页
Power System Technology
基金
国家自然科学基金资助项目(50467001
50867001)
高等学校博士学科点专项科研基金资助项目(20060593002)
广西自然科学基金资助项目(0448025)
广西研究生教育创新计划项目(2007105930808M046)~~
关键词
潮流计算
PV—PQ节点类型转换
非线性规划
内点法
电力系统
power flow calculation
type switchingbetween PV and PQ nodes
nonlinear programming interiorpoint method
power system
