大电网中机电扰动传播影响频率动态时空分布的基础理论

After the interconnected operation of large-area power grids, disturbance propagation phenomenon and frequency dynamic temporal and spatial distribution become prominent characteristics of dynamic evolution of large-scale power grids, which make the safe and steady operation of grids much more difficult. Moreover, they haven't been analyzed and explained accurately in theory up to now..This project works mainly aiming at scientific issues, such as the propagation characteristics of coupled electromechanical disturbance..1) Considering spatial information of grids, the action-mechanisms of grid structure and operational parameters influencing disturbance propagation characteristics will be studied using continuum modeling;.2)Next, we will carry out the study on characteristics of energy-storing element influencing disturbance propagation;.3) Then the physical essence of energy propagation within a large scope within the grid will be also expatiated by dispersion phenomenon..This project is the further research and exploration aiming at the complicated power grid itself, focuses on the reveal of intrinsic mechanism and physical phenomena. That of studying the law of electromechanical disturbance propagation within a large-scale interconnected power grid has important theoretical significance and practical value to the strategic implementation for nation-wide interconnection of power grid.

大区域电网互联运行后，扰动传播现象和频率动态时空分布成为大规模电网动态演变的显著特征，使得电网的安全稳定运行更加困难，目前还无法从理论上进行准确分析和解释。项目针对大规模电网中机电耦合扰动传播特性等科学问题，考虑电网空间信息，运用连续体建模研究网架结构和运行参数对扰动传播特性的作用机制；研究储能元件对机电扰动传播的影响特征；运用色散现象诠释机电扰动在电网中大范围传播的物理本质。项目是对复杂电网本身的探索，关注机理和物理现象本质的揭示。研究机电扰动在大电网中的传播规律，为大规模互联电网的安全运行和稳定控制提供理论依据。

针对电力系统中发电机内电抗影响机电扰动传播的机理进行了深入分析，通过新的构造函数给出机电扰动传播的解析解；研究了超导磁储能装置(SMES)抑制电力系统中机电扰动传播和功率振荡的导纳控制方法数学模型，结果表明该控制方法不仅可以有效抑制功率振荡，而且能使系统迅速恢复稳定状态，从而大大提高电力系统的运行稳定性；研究了电池储能系统(CBEST)对机电扰动传播的影响，利用其灵活高效吸收多余功率、补偿功率缺额的优点，实现了非正常工况下的功率平衡，以及对功率振荡的抑制作用；以风力发电为背景，研究了风电场的随机功率的对接入电网的冲击作用，为采用连续体建模方法研究风电场中的随机功率波动特性提供了参考；为了基于PSSE环境中更好的研究风速为扰动源时风电系统的电网动态特性，借助PSS/E自定义功能建立了风电系统的空气动力学模型及3种不同类型的风速模型。