Research on Abnormal Assessment Method of Line Loss Considering Photovoltaic Uncertainty

In the new power system, the distributed energy access system represented by photovoltaic (PV) may cause the problem of incorrect evaluation of line loss rate (LLR). To solve this problem, this paper proposes a new evaluation method. Firstly, the possible power anomalies after PV grid connection are analyzed. Secondly, the impact of various system factors on LLR is addressed using LSTM network. Then, based on the weather type index, the MonteCarol method is used to derive the probability density function of the LLR of the distribution network, and this is used to delineate the anomaly determination threshold of the LLR. Finally, taking the test system as an example, the probability density distribution of the daily LLR of the line after PV access is actually evaluated and compared and analyzed with the traditional evaluation method.