电力网络的谐振稳定性分析方法研究

发布时间：2018-07-25 06:50

【摘要】：随着电力系统电力电子化程度的不断加深,近年来出现了多起机理不明的新的振荡现象。提出了电力网络谐振稳定性的概念,试图将上述机理不明的振荡现象纳入到电力网络的谐振不稳定范畴,从而基于线性网络理论对众多复杂振荡现象进行分析,为借助数学上完全成熟的线性系统理论解决电力系统实际问题提供一条途径。围绕判断谐振稳定性的分析方法展开,通过引入电力网络的s域节点导纳矩阵,将电力网络的谐振稳定性问题归结为判断s域节点导纳矩阵行列式的零点在复平面上的分布问题。首先,理论证明了s域节点导纳矩阵行列式的零点就是系统的特征值。其次,给出了求解s域节点导纳矩阵行列式零点的实部-虚部交叉迭代法。接着,推导了特定谐振模式下的节点电压振型和参与因子矩阵,这2个指标可用来定位特定谐振模式发生的位置。最后,通过算例展示了所提方法在分析电力网络谐振稳定性方面的有效性。
[Abstract]:With the deepening of electronization of electric power system, there have been many new oscillations with unknown mechanism in recent years. In this paper, the concept of resonance stability of power network is proposed, and the oscillation phenomenon with unknown mechanism is tried to be brought into the category of resonance instability of power network, and many complex oscillation phenomena are analyzed based on linear network theory. It provides a way to solve the practical problems of power system by means of the fully matured linear system theory in mathematics. By introducing the S-domain node admittance matrix of the power network, the analytical method of judging the resonance stability is developed. The resonance stability of power network is reduced to the problem of determining the distribution of zero point of admittance matrix determinant of node in s domain on the complex plane. Firstly, it is proved that the zero point of the determinant of the node admittance matrix in s domain is the eigenvalue of the system. Secondly, the real part-virtual part cross iteration method is given to solve the zero point of the admittance matrix determinant of node in s domain. Then, the nodal voltage mode and the participation factor matrix are derived, which can be used to locate the location of the specific resonant mode. Finally, an example is given to demonstrate the effectiveness of the proposed method in analyzing the resonance stability of power network.
【作者单位】：浙江大学电气工程学院;
【基金】：国家高技术研究发展计划项目(863计划)(2011AA05A119) 国家电网公司科技项目(柔性输电网规划评估方法及应用关键技术研究)~~
【分类号】：TM712

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