定子绕组暂态对同步调相机动态无功特性的影响

Influence of stator winding transient on dynamic reactive power characteristic of synchronous condensers

为了研究定子绕组暂态对同步调相机动态无功特性及特高压直流近区系统电压的调节作用,对比分析了定子绕组暂态对同步调相机实用模型的影响。首先建立了同步调相机的时步有限元模型,并通过模型机的动态实验对计算结果进行了验证,从而获得了同步调相机的标准响应曲线;然后推导了计及定子绕组暂态与不及定子绕组暂态时同步调相机的饱和实用模型,计算了系统电压突变后不恢复、突变持续0.2 s恢复和突变持续1 s恢复时同步调相机的动态无功特性及机端电压的变化规律,最后对比分析了系统电压突升及突降时定子绕组暂态对同步调相机发出无功能力和吸收无功能力的影响。研究结果可为同步调相机的无功动态特性提供技术支撑,进一步保障电网电压稳定运行。

In order to study the influence of stator winding transient on the dynamic reactive power characteristics of synchronous condensers and the voltage regulation of ultra high voltage direct current(UHVDC)near-zone system,the influence of stator winding transient on the practical model of synchronous condensers was compared and analyzed.Firstly,the time-step finite element model of the synchronous condenser was established,and the calculation results were verified by the experiments of the model machine,thus the standard response curve of the synchronous condenser was obtained.Then the saturated practical model of the synchronous condenser with and without the stator winding transient was deduced,and the variation law of the dynamic reactive power characteristic and terminal voltage were calculated under different disturbance of the system voltage.At last,influence of the stator winding transient on the ability of the absorbing and delivering reactive power was studied under the rise and drop of the system voltage.The change rule of the contrast analysis of the system voltage rose and fell sharply when the stator winding transient synchronous condenser is on the influence of the reactive power ability and has the ability to absorb reactive power.The research results provide technical support for the reactive dynamic characteristics of synchronous condensers and further guarantee the stable operation of the power grid voltage.