基于相角差时间函数调相机并网合闸时间预测

针对大型同步调相机并网条件差、成功率低的问题,对传统的相角差时间函数加以改进,改进后的曲线能够体现相角差在0到2π之间的变化规律,且直观表示出在一定的滑差转速范围内是否存在同期点和其存在个数以及在一定的相角差范围内所对应的合闸时间范围,为预计合闸脉冲发出时刻提供了很大便利。通过算例分析了当以惰性减速起始时刻为0时刻点,-0.167 r/s^2为加速度开始惰性减速时,最大允许滑差范围内出现的同期点个数,以及调相机允许的合闸时间范围,并在Matlab/Simulink仿真软件上验证了算例分析结果的正确性。同时,以调相机所受冲击电流作为最大允许相角差的整定依据有效减少了并网时对调相机的冲击,提高了并网的成功率。

Prediction of grid-connected closing time of synchronous condenser based on improved phase-difference time function

Aiming at the problem of poor grid connection condition and low success rate of large synchronous condenser,the traditional phase angle difference time function is improved.The improved curve can reflect the change rule of phase angle difference between 0 and 2π,and directly show whether there are synchronization points and their number in a certain slip speed range and the corresponding closing time range in a certain phase angle difference range.It is very convenient to predict the time when the closing pulse is sent out.When the initial moment of inert deceleration is 0 and the acceleration starts to decelerate with-0.167 r/s^2 as the starting point of inert deceleration,the number of simultaneous points within the maximum allowable slip range and the closing time range allowed by the synchronous condensers are analyzed through examples,and the correctness of the example analysis results is verified by Matlab/Simulink simulation software.At the same time,taking the impulse current of the phase modulator as the setting basis of the maximum allowable phase angle difference can effectively reduce the impact on the synchronous condenser when connected to the grid,and improve the success rate of connected to the grid.