抽蓄电站一管两机负荷扰动时被扰机组特性研究

Study on load disturbance characteristics of disturbedunit in pumped-storage power station with two-unit sharing common tube

我国抽水蓄能电站多采用一管多机型式布置,因而导致同一水力单元的多台机组存在显著的水力干扰现象。以浙江省仙居抽水蓄能电站为研究实例,针对一管双机系统负荷扰动情况开展了试验研究,对开度模式和功率模式下机组的振动、摆度、压力脉动等稳定性参数变化规律进行研究,对受扰机组电磁稳定性变化情况进行分析,并探讨了2种模式下工况参数的变化差异。测试结果表明:一管双机额定负荷情况下,当一台机组甩负荷扰动另外一台机组时,被扰机组在开度模式下运行相较于功率模式下运行的功率波动大,被扰机组稳定性参数中含有甩负荷机组产生的扰动频率;被扰机组能够做出良好的响应,被扰机组稳定性参数在可控范围内,不会对其造成严重影响。

Most pumped-storage power stations(PSP)in China employ designing of mulit-unit configuration sharing common tube.Serious hydraulic disturbance phenomenon occurs in multiple units sharing the same tube.In this paper,taking Xianju pumped-storage power station for example,load disturbance test of pumped-storage power station with two-unit sharing common tube has been performed.Stability parameter variation principles under speed governor opening control mode and constant power mode have been researched,including unit vibrations,unit swing,pressure pulsations,etc.The variation of electromagnetic stability of the disturbed unit was analyzed,and the variation of operating parameters in the two modes was discussed.The results showed that under the condition of two units sharing common tube with rated load running,when one unit’s load disturbed the other unit,the disturbed unit load varied larger in speed governor opening control mode than in constant power mode.Disturbance frequencies from load rejection unit were found in some stability parameters of the disturbed unit.The disturbed unit responds well,keeping related parameters within controllable ranges.