摘要
以水轮机组为研究对象,在其简化模型和典型模型的基础上,分析了电网侧功率引入水电机组后,输出机械功率的动态特性。结果表明:由于水电机组功频调速控制系统的机械功率反馈通道变成电功率前馈通道,导致水电机组的系统阻尼降低,在低频带或超低频带内存在共振频率,使得振幅变大。证实了水电机组系统和火电机组一样,也能成为电力系统低频振荡的功率来源。
Taking hydro turbine as study object, based on the simplified model and typical model, the dynamics characteristics of mechanical power is analyzed after the grid-side power imported in hydropower units. It is concluded that the damping of hydroelectric generating system is reduced, resonance frequency exists in low frequency or ultra-low frequency band make its amplitude large due to mechanical power feedback path become electric power feedforward path in control system of power-frequency rotate speed regulation of the hydroelectric generators. The study confirms that just same as thermal power unit, the hydropower unit can also become power source of power system low frequency oscillation.
出处
《陕西电力》
2016年第4期38-41,共4页
Shanxi Electric Power
关键词
超低频振荡
阻尼
幅频特性
功频调速控制
电功率反馈
extra low-frequency oscillation
damping
amplitude-frequency characteristics
turbine-boiler coordinated control
electric power feedforward
