非并网自备电源电压跌落检测与评估的研究

Research on Voltage Sag Detection and Evaluation of Non Grid Connected Power Supply

采用非序贯蒙特卡罗法计算和评估非并网自备电源故障工作状态下的电压跌落。通过建立概率模型、样本随机抽样,样本统计量数据评估来计算和评估自备电源系统中的电压跌落。触发信号与故障信号的下降沿时刻差值Δt值集中于(1.675±0.1)ms范围内,节点1和节点3发生故障时电流通过时间较短,电压跌落幅值大概率在0.6 p.u之上。非序贯蒙特卡罗法仿真分析的幅值、电压跌落概率与实测统计法相近,具有良好的稳定性和准确性。

Voltage drop of Non-grid-connected self-contained power supply were detected and evaluated by Non-sequential Monte Carlo Method.Through establishing the probability model,random sampling and evaluating the samples statistical data to calculate and evaluate voltage drop in self powered power system.The time difference(Δt)between trigger signal and fault signal concentrated in the range of(1.675±0.1)ms.The current passing time was shorter and the voltage drop rate was above 0.6 p.u.when node 1 went wrong with node 3.The amplitude and voltage sag probability of Non-sequential Monte Carlo simulation analysis were similar to the measured statistics of actual statistical method,which showed that the simulation analysis based on non-sequential Monte Carlo method had good stability and accuracy.