水力发电机组在负荷突变下的瞬态切换调节

电力负荷小波动情况已经成为水力发电机组运行时频繁出现的运行工况,为此,主要研究了水轮机调节系统(HTGS)在负荷突变情况下的瞬态切换调节和过渡过程调节稳定性评价问题。提出在适当时间将HTGS从PID调节切换到PI调节,定义了多因素稳定性指标M。从定性和定量角度证明此方法有效性,并分析了不同切换时间下的调节效果。在过渡过程的中期(t_s=10 s^13 s)将HTGS从PID调节切换到PI调节,可以减小机组波动,使机组快速达到稳定。相较于PI和PID调节,机组在10 s切换时系统不稳定程度可以降低4.5%和7.1%。

Transient Switching Regulation of a Hydro-turbine Governing System Under Sudden Loads

The small fluctuation of electric power load has become a frequently occurring operating condition during the operation of the hydro-generator units. For this reason, the transient switching regulation and transient process regulation stability evaluation of the hydro-turbine governing system(HTGS) under a sudden load change have been analyzed in this paper. It is proposed to switch the HTGS from PID regulation to PI regulation at an appropriate time, and a multi-factor stability index M is defined. The effectiveness of this method is proved from the qualitative and quantitative perspectives, and the regulation effect under different switching time is analyzed. Switching the HTGS from PID regulation to PI regulation in the middle of the transition process(t_s=10 s^13 s) can reduce unit fluctuations and make the unit quickly reach stability. Compared with PI and PID regulation, the system instability degree can be reduced by 4.5% and 7.1% when the unit is switched at 10 s.