【作者】 李斌；

【导师】 马进； 仲悟之；

【作者基本信息】 华北电力大学 ， 电子与通信工程（专业学位）， 2015， 硕士

【摘要】 近年来,伴随着电力市场管制的放松,用电负荷正迅猛增长,电力系统的运行越来越接近其极限,电压失稳事故更容易发生。连续潮流法是静态电压稳定性分析的核心组成部分,能够提供电网的极限传输功率以及系统当前运行点离极限运行点的距离,便于电力系统运行人员采取措施防止电压失稳事故的发生。然而,现有的连续潮流法都是基于非线性的潮流方程,计算速度较慢,此外,在计算过程中并没有考虑动态元件的影响。基于此,本文围绕连续潮流法展开研究,力求提供更优良的解决方案,研究内容主要包括以下几个方面：(1)总结了现有连续潮流法的原理及计算步骤,分析了现有连续潮流法计算量大、速度偏慢的原因。为提高连续潮流法计算的速度,本文通过引入新的状态变量,并结合辐射型配电网络的结构特性,使雅可比矩阵无需在每次迭代时都重新计算,以减少由此带来的大量计算。在MATLAB软件中对上述所提的改进算法以及常规的连续潮流法进行编程,并通过对IEEE 14节点及PG&E 69节点配电系统仿真分析,验证本文所提算法与原有连续潮流法相比在保证了计算精度的同时显著提高了计算效率。(2)基于上述的改进方法只适用于辐射型网络,而现有的输电网络通常为环网,本文进一步对适用于输电网络的连续潮流法做出改进。通过添加新的方程使雅可比矩阵在计算中固定不变,进而提高计算的效率,并通过对IEEE 9节点换网系统的仿真验证其有效性。(3)现有连续潮流算法都是基于稳态潮流方程,忽略了系统中动态元件的作用,而电力系统是一个动态的过程。基于此,本文分析了基于电力系统全过程动态仿真程序(PSD-FDS)的电压稳定动态裕度指标,在仿真计算中重点考虑了发电机励磁限制器等动态元件的影响。通过对3机10节点系统仿真分析,以验证通过连续潮流法所得的功率极限是偏保守的。最后,本文在仿真计算中重点考虑了发电机励磁限制器的作用,分析了辽宁电网的电压稳定性,为系统的规划与运行提供了参考。更多还原

【Abstract】 In recent years, along with the deregulation of the electricity market, the load is booming, so the operation of the power system is closer to its limits, voltage instability accidents are more prone to occur. Continuation Power Flow (CPF) is a core component of the static voltage stability analysis, can provide limit transmission power and voltage stability index for operators to take measures to prevent the occurrence of power system voltage instability accident. However, the existing CPF are based on the nonlinear power flow equations, resulting in slower computing, in addition, in the calculation process does not consider the effect of dynamic elements. Based on this, this paper focuses on a study of CPF and the aim of this paper is to provide a more rapid and accurate algorithm. The study includes the following aspects:(1)Summarize the principles of the existing CPF and calculation steps, analyzing why computing speed of existing CPF is slow. To improve the calculation speed of the CPF, by introducing new state variables paper proposed an improved CPF can be used for Radial distribution grid. The new algorithm reduces the calculation amount because of Jacobian matrix is fixed. In this paper, implement the traditional CPF and improved CPF with MATLAB and benchmark systems including IEEE 14-node, the U.S. PG & E 69-node distribution network systems are tested to demonstrate the efficiency and reliability of our methodology and algorithm.(2) Because the above improved method is only applicable to radiation networks, this paper further improves the CPF can be applied to the transmission network. By adding a new equation so that Jacobian matrix is fixed in the calculations, increasing the efficiency of computing. Simulation of IEEE 9-node system verify the effectiveness of improved CPF.(3)Existing static voltage stability analysis methods are based on the steady-state power flow equations, ignoring the role of the system dynamics originals, but the power system is a dynamic process. So this paper presents a dynamic voltage stability index based on PSD-FDS which takes into account the impact of simulation generator excitation limiters. Through simulation of 3-generator-10-node system, verify the power limit calculated by CPF is conservative bias. Finally, this paper analyzes the voltage stability of Liaoning Power Grid for providing a reference to operators.更多还原