基于分频器理论的新能源电网暂态频率稳定分析方法

雷傲宇; 苏婷婷; 梅勇; 刘子祺; 王裕; 吴为

雷傲宇,苏婷婷,梅勇,刘子祺,王裕,吴为.基于分频器理论的新能源电网暂态频率稳定分析方法[J].电测与仪表,2024,61(4):132-140.
Lei Aoyu,Su Tingting,Mei Yong,Liu Ziqi,Wang Yu,Wu Wei.A Transient Frequency Stability Analysis Method for New Energy Grid Based on Frequency Divider Theory[J].Electrical Measurement & Instrumentation,2024,61(4):132-140.

基于分频器理论的新能源电网暂态频率稳定分析方法

A Transient Frequency Stability Analysis Method for New Energy Grid Based on Frequency Divider Theory

DOI：10.19753/j.issn1001-1390.2024.04.019

中文关键词: 暂态频率稳定新能源电网分频器理论分析方法

英文关键词:Transient frequency stability New energy grid Frequency divider theory Analysis Method

基金项目:国家自然科学基金资助项目（ 62273104）

作者中文名	作者英文名	单位
雷傲宇	Lei Aoyu	中国南方电网
苏婷婷	Su Tingting	广东工业大学
梅勇	Mei Yong	中国南方电网
刘子祺	Liu Ziqi	广东工业大学
王裕	Wang Yu	广东工业大学
吴为	Wu Wei	中国南方电网

摘要点击次数: 670

中文摘要:

确保频率在合理范围内是电网安全稳定运行的基本要求。时域仿真法是电力系统暂态频率稳定分析的常用方法，其在分析输电线路频率相关参数时，通常将其设定为额定值。然而，随着新能源比例不断提升，电网频率动态过程分析不再局限于发电机节点，系统惯量、频率时空分布、调频资源分布差异更为显著；已有传统数值微分得到频率分析的方法，当系统受到大扰动，各节点频率发生明显偏移时，难以保证其分析精度，也难以复现故障发生后电网频率实际变化轨迹，影响系统频率分析和控制的准确性。因此，本文提出一种基于分频器理论的新型电力系统暂态频率分析方法。与传统频率分析方法相比，该方法在暂态过程中可准确地刻画瞬态条件，节点频率随着节点间电气距离、传输线路和变压器电抗变化而变化，并对模型元件频率参数进行动态修正，可更精确地表征系统受扰后的频率特性，有效提高时域仿真和分析精度。通过仿真验证了所提出方法的正确性和优越性，可为新型电力系统频率分析和控制设计提供新的思路和参考方案。

英文摘要:

To ensure that the frequency is within a reasonable range is basic requirement for safe and stable operation of power grid. In current time-domain simulation analysis methods of transient frequency stability of power system, most of frequency related parameters of transmission lines are fixed as rated values. With the increasing proportion of new energy sources, the frequency dynamic process analysis of new power systems is no longer limited to generator nodes, and the differences of inertia, frequency spatio-temporal and frequency modulation resource distribution are more significant. The frequency of each node is obviously offset under large disturbance, and the accuracy of frequency analysis results obtained by traditional numerical differentiation is difficult to guarantee, which is difficult to reproduce the actual frequency change track after the occurrence of power network faults, affecting the accuracy of frequency analysis and control. Therefore, a new transient frequency analysis method based on frequency divider theory is proposed in this paper. Compared with traditional method, The method can accurately simulate transient conditions in the transient process, and the node frequency varies with electrical distance between nodes, transmission line and transformer reactance, which can accurately simulate transient conditions and dynamically modify the element frequency parameters in the model, characterizing the frequency characteristics of system after disturbance more accurately and improving the accuracy of the time domain simulation and analysis more effectively. The correctness and superiority of proposed method are verified by simulation, which can provide a new idea and reference scheme for frequency analysis and control design of new power system.

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