水机电耦合系统建模及暂态分析

Study on the Hydraulic-mechanical-electric Coupled System and Its Transients

在水电系统研究中,水力系统与电力系统模型精度失配、缺乏全面的水机电数学模型是制约水电系统动态过程研究和提高仿真精度的主要原因。基于水机电各元件模型,采用积木式结构在MATLAB/Simulink环境下构建了水机电整体耦合系统模型,便于研究水力系统和电气系统之间的相互影响,分析水电站的暂态过程。基于该模型对单机无穷大系统进行了仿真研究,比较了电气系统扰动对水力系统的影响以及水力系统扰动对电气系统的影响,并对仿真结果进行了分析。

In the study of hydroelectric system, the precision mismatch between the hydraulic system and the power system models, the lack of a hydraulic-mechanical-electrical system model impede the transient process study and improvement of simulation precision on the hydroelectric system. Based on the individual component model, an integral hydraulic-mechanical- electric system model is established using MATLAB/Simulink modulars. This model suits to study the interaction between the hydraulic system and the electric system, and analyze the transients of a hydro plant. The interaction between the power system oscillation and hydraulic system oscillation is studied on a single machine infinite system.