电力系统电磁暂态与机电暂态程序的混合仿真研究-电力系统及其自动化专业论文.docxVIP

摘要 近年来，我国电力工业迅猛发展。随着三峡电厂的技运，及西电东送的实施， 全国电网逐渐形成。为了保持系统运行的经济性及稳定性，交直流混合输电方式 及大量新型快速动作的电力电子器件技入到电力系统中。这些设备在为系统运行 带来积极作用的同时，也对系统的稳定性分析和控制提出了挑战。这就需要人们 开发更加有效的系统分析和仿真工具。独立的电磁暂态和机电暂态程序由于其自 身的缺点，已经难以适应现代电力系统对仿真的要求。 为了克服上面的缺点，本文的工作主要包括如下: 实现了电力系统元件诸如发电机、变压器、输电线路等的电磁暂态模型:并 且编制了能够计算一定规模系统的电磁暂态程序。经过与 ATP 等电磁暂态程序 的对照，该仿真程序是足够精确的。 其次，针对当前变压器暂态过程仿真中，各独立的变压器模型不能很好地完 成仿真的问题，提出了自适应模型用于实现变压器暂态过程的仿真新算法。仿真 算例表明，该算法在保证仿真精度的同时，能够加快仿真的速度。 最后，本文提出了基于 ward 等值的混合仿真接口算法。具体包括 z 机电暂 态网络对电磁暂态网络的等值:电磁暂态部分对机电暂态部分的等值:电磁暂态 和机电暂态程序串行交互方式。并且针对机电暂态网络的等值电路不能够准确反 映网络的频率响应，进一步提出了多接口母线外部系统的频率等值电路。该电路 能够提高混合仿真的稳定性，并且降低了接口地点选择的复杂性。 关键词z 电力系统，混合仿真，电磁暂态，机电暂态 ABSTRACT In recent years，elec往ic industry of our coun町 has kept developing with a high speed. The national grid has been gradually forming with the Three-gorge hydraulic pow町 plant being put into service and the implementation of transferring the energy 仕om west to east. In order to keep the system to operate economically and stably，the hybrid of AC and DC 住ansmission and a lot of new device with quick action mode are running in the pow町 system. These devices bring great positive effect for the system operation，however，at the meantime ，also bring some challenge for the system stability analysis and control. The self-governed electromagnetic transient program and 伎ansient stability program are not suitable for the modem power system any more. Therefore，the more effective and powerful tools are strongly desired. Focusing on the above issues，the thesis chooses the hybrid simulation of the electroma伊etic and electr如mechanic transients ofpower system to be the subject，and the content is 部岛llows: The electromagnetic models of the power system devices such as the synchronic machine，transmission line and transformer are developed; based on 也就， electromagnetic transient program which can simulate a moderate scale system is further developed. The comparison of the test result by the program developed and ATP shows that the program and models