摘要
针对采用牛拉(NR)法计算电力系统交直流系统潮流存在初值选取和计算量大的不足,提出一种用于交直流潮流计算的全纯嵌入方法。该方法首先依据全纯函数构造原理,通过嵌入参数,分别构建全纯交流潮流模型、直流潮流模型及换流站控制模型;然后,基于全纯函数的泰勒级数展开特性,将非线性全纯潮流方程的求解问题,转换为隐式全纯函数的显式化问题;依据同次幂系数相等原则,求取泰勒级数展开项的幂级数系数,完成全纯函数的显式化,进而对嵌入参数赋值,实现交直流潮流的快速求解;最后,通过修改的IEEE5节点交直流系统、RTS-96交直流系统和波兰电网3012wp交直流测试系统进行分析和验证,结果表明,所提方法不依赖初值便可快速、准确地计算出交直流系统潮流,且鲁棒性强,为大规模交直流电网潮流计算提供了新思路。
In order to address the initial value selection and large calculation amount when Newton Raphson(NR) method is used to calculate AC-DC power flow, this paper proposes a holomorphic embedding method for AC-DC power flow calculation. Firstly, according to the construction principle of holomorphic function, the holomorphic AC-DC power flow model and converter station control model are constructed by embedding parameters. Then, based on the Taylor series expansion characteristics of the holomorphic function, the problem of solving nonlinear power flow equations is transformed into an explicit problem of implicit holomorphic functions. Moreover, according to the principle that the same power coefficient is equal, the power series coefficient of Taylor series expansion term is obtained, and the explicit holomorphic function is completed, and then the embedded parameters are assigned to realize the fast solution of AC-DC power flow. Finally, it is analyzed and verified through modified IEEE 5 node AC-DC system, RTS-96 AC-DC system and Polish power grid 3012 wp AC-DC test system. The results show that the proposed method can quickly and accurately calculate the power flow of AC-DC power system without relying on the initial value, and has strong robustness, which provides a new idea for power flow calculation of large-scale AC-DC power grid.
作者
姜涛
张勇
李雪
李国庆
陈厚合
Jiang Tao;Zhang Yong;Li Xue;Li Guoqing;Chen Houhe(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education Northeast Electric Power University,Jilin 132012 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2021年第21期4429-4443,4481,共16页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(52077029,U2066208,52061635103)
国家重点研发计划(2016YFB0900900)资助项目。
关键词
交直流系统
电压源型换流器
全纯函数
潮流计算
AC-DC hybrid system
voltage source converter
holomorphic function
power flow calculation
