带变顶高尾水洞水电机组调速器功率模式优化研究

通过现场实测及数值仿真研究了带变顶高尾水洞水电机组调速器功率模式下的一次调频及负荷调节过渡过程。提出了一种基于“三区模型”的带变顶高尾水隧洞小波动过渡过程的仿真方法，并推导了状态方程组，基于调速器PLC程序及参数实测建立了水轮机调速器功率模式的仿真模型，利用现场真机试验对仿真模型进行了验证。针对带变顶高尾水隧洞水电机组的特点，从降低功率反调，提高调功速度，保证功率调节过程稳定性的角度出发，采用了“慢-快-慢”的“三段式调节”的方式改善调速器功率调节的动态品质。通过数值仿真对调速器的功率调节策略及参数进行了优化，优化后机组功率调节速度明显提高，功率反调值降低，改善了调速器功率模式下的一次调频及负荷调节过渡过程性能。

Optimization of governor power mode for hydro-turbine units with slope ceiling tail tunnels

This paper analyses the transient process of hydro-turbine units with slope ceiling tail tunnels under primary frequency regulation and load regulation in governor power mode through field measurement and numerical simulation, and presents a simulation method based on three-zone modelling of small flow fluctuations in the tail tunnels. We derive the governing equations of the transient process, construct a simulation model of hydro-turbine regulators in governor power mode, and verify it using PLC program governor identification and the measured data. Aimed at the hydro-turbine unit with a slope ceiling tail tunnel, a "slow-fast-slow" three-stage regulation method for improving power mode dynamic quality is developed to reduce power anti-regulation values, increase power regulation speed and ensure operation stability. The strategy and parameters of governor power regulation are optimized using numerical simulations. Results show that through optimization, the power regulation is speeded up obviously, the power anti-regulation value is decreased, and the hydro-turbine transient process of primary frequency regulation and load regulation under the governor power mode is improved significantly.