摘要
为解决大规模新型可再生能源的并网和消纳问题,多端柔性交、直流混合输电系统成为近年来研究的热点,且潮流计算分析又是研究其稳定控制及故障分析的基础.对此,建立了基于模块化多电平换流器的多端直流输电系统(MMC-MTDC)的稳态潮流计算数学模型,提出了MMC-MTDC交直流混合系统潮流计算的交替迭代求解法,对交流子系统采用传统的牛顿-拉夫逊计算方法,对直流子系统则采用节点阻抗矩阵形式的Gauss-Seidel方法.最后,在MATLAB软件平台编写交替迭代算法程序,以改进的IEEE 9和IEEE 22节点且包含三端MMC-MTDC的交直流混合系统为例进行仿真计算,结果表明所提出的交替迭代求解法具有收敛速度快、准确性高的优点.
In order to solve the problem of gridconnection and admission of large-scale renewable energy source,the multi-terminal AC/DC hybrid transmission system has become a research highlight in recent years and the calculation and analysis of power flow is just the basis of investigation of its stability control and fault analysis.Therefore,a mathematical model is established in this paper for steady-state power flow calculation on the basis of modularized multi-terminal direct-current power transmission system with multilevel converter(MMC-MTDC).An alternating iterative solution algorithm is proposed for power flow calculation of MMC-MTDC AC/DC hybrid system.The traditional Newton-Raphson method is adopted to the AC subsystems and the Gauss-Seidel(GS)method based on node impedance matrix is utilized to the DC subsystem.Finally,the program of alternative-iterative algorithm is compiled on MATLAB software platform.Taking the AC/DC hybrid system with improved IEEE 9 and IEEE 22 nodes and three-terminal MMC-HVDC as example,simulation calculation is carried out.The result shows that the proposed alternative-iterative method will have the advantages of fast convergence and high accuracy.
作者
张明光
蔡云
丁晶晶
ZHANG Ming-guang;CAI Yun;DING Jing-jing(College of Electrical and Information Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Key Laboratory of Gansu AdvancedControl for Industrial Processes,Lanzhou Univ.of Tech.,Lanzhou 730050,China;National Demonstration Center for ExperimentalElectrical and Control Engineering Education,Lanzhou Univ.of Tech.,Lanzhou 730050,China)
出处
《兰州理工大学学报》
CAS
北大核心
2019年第6期91-98,共8页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51567016).
