含柔性直流输电系统的潮流计算方法研究

发布时间：2018-03-07 19:34

本文选题：潮流计算　切入点：柔性直流输电　出处：《沈阳工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：自从世界上第一个直流输电工程投入商业运行，高压直流输电系统的发展经历了巨大的变化。近年来光伏发电和风力发电因其具有清洁、可再生等优点受到了人们越来越多的关注。但是可再生能源的大规模应用使得与交流输电系统或传统的高压直流输电系统的并网产生了新的问题。当新能源并网后，电力系统潮流方程也不同于传统潮流方程。因此，解决含有柔性直流输电及新能源的电力系统潮流算法问题对电网未来建设有着重要的意义。本文首先研究了VSC-HVDC的组成以及工作原理，分析了柔性直流输电各部分的作用。在此基础上，研究了多端柔性直流输电系统及其数学模型，分析了电压源换流器的稳态控制方式。采用了针对多端交直流混合输电系统的潮流计算统一迭代求解方法，详细介绍了在该算法下直流系统方程和功率偏差方程以及雅可比矩阵的形成方法，并根据VSC的各种不同控制方式，对雅克比矩阵进行修正。在介绍统一迭代法的同时给出了交替求解法计算流程图。采用本文所述统一迭代法对多端交直流混合系统、区域互联系统以及复杂混联系统算例进行了计算和验证，计算结果证明了该统一迭代算法的有效性和准确性以及针对不同类型算例的适应性。在此基础上针对含有新能源的潮流计算方法展开研究。分别讨论了光伏和风电的运行原理，将建立的光伏发电系统数学模型和风电场数学模型与电力系统潮流模型结合，，采用交直流统一迭代算法，对含光伏发电和风电系统的电力系统进行潮流计算。
[Abstract]:Since the first HVDC project was put into commercial operation in the world, the development of HVDC system has undergone tremendous changes. People pay more and more attention to the advantages of renewable energy, but the large-scale application of renewable energy causes new problems with AC transmission system or traditional HVDC system. The power flow equation of power system is also different from the traditional power flow equation. Therefore, it is of great significance to solve the power flow algorithm problem of power system with flexible direct current transmission and new energy sources. In this paper, the composition and working principle of VSC-HVDC are studied, and the function of each part of flexible direct current transmission is analyzed. On this basis, the multi-terminal flexible direct current transmission system and its mathematical model are studied. The steady-state control mode of voltage source converter is analyzed, and the unified iterative method of power flow calculation for multi-terminal AC / DC hybrid transmission system is adopted. In this paper, the DC system equation, power deviation equation and Jacobian matrix under the algorithm are introduced in detail, and according to the different control methods of VSC, The Jacobian matrix is modified. The unified iterative method is introduced and the flow chart of the alternating solution method is given. The unified iterative method is used in the multiterminal AC / DC hybrid system. The examples of regional interconnected system and complex hybrid system are calculated and verified. The results show the validity and accuracy of the unified iterative algorithm and the adaptability of the algorithm to different types of examples. On this basis, the calculation method of power flow with new energy is studied. The operation principle of photovoltaic and wind power is discussed, and the mathematical model of photovoltaic system and wind farm is combined with the power flow model of power system. A unified AC / DC iterative algorithm is used to calculate the power flow of the power system with photovoltaic and wind power systems.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM744

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