混流式水轮机与发电机匹配特性对调速系统稳定性的影响分析

Analysis of the Impact of Mixed-Flow Turbine-Generator Matching Characteristics on Speed Regulation System Stability

摘要

混流式水轮发电机组是中低水头水电站的关键设备，其运行稳定性直接影响水能利用效率与电网安全。本文基于机电耦合动力学模型与调速控制原理，分析两者在变工况下的耦合机理及参数影响，重点探讨流量特性曲线、惯性常数与电磁转矩对稳定性的作用。通过建立非线性与线性化模型，对不同匹配参数下的动态响应进行比较。结果表明，合理配置机械惯性与电磁阻尼可显著提升调速系统稳定性，避免机组在低水头、大流量工况下出现振荡。研究成果对混流式机组的匹配设计与稳定控制具有重要工程指导价值。

Abstract

The mixed-flow turbine-generator unit is a critical component in medium and low-head hydropower stations, where operational stability directly affects both hydropower utilization efficiency and grid security. Based on electromechanical coupling dynamics models and speed regulation control principles, this study analyzes the coupling mechanisms and parameter effects under variable operating conditions, with a focus on the roles of flow characteristic curves, inertia constants, and electromagnetic torque in stability. Through establishing nonlinear and linearized models, dynamic responses under different matching parameters are compared. Results demonstrate that optimal configuration of mechanical inertia and electromagnetic damping can significantly enhance speed regulation system stability, preventing oscillations during low-head and high-flow operations. These findings provide valuable engineering guidance for the matching design and stability control of mixed-flow turbine units.

关键词

混流式水轮机 / 发电机匹配特性 / 调速系统

Key words

Francis turbine / Generator matching characteristics / Speed control system

参考文献

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