不同工况下同步调相机定位筋磁场及感应电动势分析

随着高压直流输电系统对无功补偿设备快速响应能力和设备容量需求的不断加大,大容量新型同步调相机逐渐得到广泛应用。随着容量的增加,同步调相机端部漏磁大大增加。定位筋中的漏磁场中主要为轴向磁密分量,该磁场随着定子电流的交变呈现旋转效应,因此易在定子铁芯定位筋中产生较大的感应电动势,导致放电风险增大,从而降低同步调相机的使用寿命。本文建立了同步调相机端部的三维有限元模型,计算了同步调相机在空载、额定负载和失磁情况下定位筋中的磁密分布,并对比分析了其中的感应电动势大小,为进一步评估定位筋放电风险提供了理论基础。

Comparative Study on the Inducted Electromotive Force of the Building Bar under Different Working Conditions of the Synchronous Condenser

With the rapid response of HVDC system to reactive power compensation equipment and the increasing demand for equipment capacity,large capacity and new-type synchronous condenser has been widely used.With the increase of the capacity,the leakage flux at the end of the synchronous condenser increases greatly.The leakage magnetic field in the building bar is mainly the axial magnetic density component,the magnetic field presents a rotation effect with the alternation of the stator current,so it is easy to produce large induced electromotive force in the stator core building bar,which leads to the increase of the discharge risk,thus reducing the service life of the synchronous condenser.In this paper,a three-dimensional finite element model of the end of synchronous condenser is established,and the magnetic density distribution in the building bar is calculated under the condition of no-load,rated load and loss of excitation of the condenser.The magnitude of induced electromotive force is compared and analyzed,which provides a theoretical basis for further evaluation of the discharge risk of building bar.