Visualization of Dynamic Unstable Phenomena in Large-Scale Power System

本研究主要研究大型电力系统动态现象和稳态状态的可视化技术。提出了P- δ图、V- δ图、Q- δ图和Q-V- δ图，并制作了它们的二维动画，其中P和Q分别为通过输电线路的有功功率和无功功率，V和delta分别为节点电压的幅值和相位角。2.3大型电力系统不稳定和欠阻尼摆动现象的三维动画如下图所示(1)竖杆动画，竖杆高度表示相位角或角速度；水平管道代表传输线，其直径、颜色或运动条纹代表有功潮流(2)气球动画，其直径和垂直位置分别代表发电机的蓄能和相位角，气球与负荷节点之间的管道代表通过传输线的有功潮流(3)垂直杆子动画。其中高度和直径分别代表节点和传输线，水平位置分别代表相位角。(4)带盘动画，直径和旋转分别表示电压的大小和相位角，弹性弦表示同步功率。利用FFT分析的摆动现象的一些振荡模式被表示为三维动画，帮助我们理解复杂的功率摆动现象的物理意义。因此，通过以上的三维动画，可以直观地理解在哪里出现了什么样的振荡模式。4.2开发了2d动画来展示大型电力系统中相干发电机在振荡期间的行为。5.3开发了小模型系统中电压不稳定现象的3D动画。

Visualization technique of dynamic phenomena and steady-state condition in large-scale power system has been studied in this research.1.P-delta map, V-dalta map, Q-delta map and Q-V-delta map are proposed and their 2D animations are developed, where P and Q are active and reactive power through transmission line respectively and V and delta are magnitude and phase angle of node voltage respectively.2.3D animations of unstable and poorly damped swing phenomena in large-scale power system are developed as shown bellow(1) animation with vertical pole, height of which represents phase angle or angle speed, and horizontal pipe representing transmission line, diameter, color or moving stripe of which represents active power flow(2) animation with balloon, diameter and vertical position of which represent stored energy and phase angle of generator respectively, and pipe between balloon and load node representing active power flow through transmission line(3) animation with vertical pole, height and diameter of which represent node and transmission line respectively and horizontal position of which represents phase angle(4) animation with disk, diameter and rotation of which show magnitude and phase angle of voltage respectively, and elastic strings representing synchronizing power.3.Some oscillatory modes of swing phenomena analized through FFT are represented as 3D animations to help us understand physical meanings of complicated power swing phenomena. As a result, it has been made clear that it becomes easy to understand intuitively where what kinds of oscillatory mode appear by looking at the above 3D animation.4.2D animation is developed to show how coherent generators behave during the period of oscillation in large-scale power system.5.3D animation are developed for voltage instability phenomena in small model system.