基于拓扑辨识的光伏暂态故障定位方法

Photovoltaic transient fault location method based on topology identification

光伏电网暂态故障结构复杂,传统故障定位方法对故障数据之间存在的隐含关联规则辨识能力较弱,导致最终的定位存在偏差。为此,提出基于拓扑辨识的光伏电网暂态故障自动定位方法。以电压相位拓扑结构为依据,利用光伏列阵寻找到功率与电压之间的联系,并对电网暂态进行实时跟踪。当电网中的电压、电流发生畸变时,利用贝叶斯模型分析故障数据之间的依赖关系,实现故障位置的定位。实验结果表明:与传统方法相比,该方法能够准确辨识隐含的关联规则、精准界定故障数据边界、确定电网故障的具体位置,为保障光伏电网的正常运行提供技术支持。

The transient fault structure of photovoltaic power grid is complex.The traditional fault location method has weak ability to identify the implicit association rules between fault data,which leads to the deviation of the final positioning.To this end,an automatic location method for transient faults in photovoltaic power grids based on topology identification is proposed.Based on the voltage phase topology,the photovoltaic array is used to find the connection between power and voltage,and the grid transient is tracked in real time.When the voltage and current in the power grid are distorted,the Bayesian model is used to analyze the dependence between the fault data to realize the location of the fault location.The experimental results show that compared with the traditional method,the method can accurately identify the implicit association rules,accurately define the fault data boundary,determine the specific location of the grid fault,and provide technical support for ensuring the normal operation of the photovoltaic grid.