分布式电源接入配电网对电流保护的影响及应对策略

Influence of Distributed Generation Connected to Distribution Network on Current Protection and Countermeasures

针对逆变型分布式电源的特点,考虑接入配电网的光伏电源输出功率变化与短路电流的关系,分析了分布式电源对原有保护的影响,提出了相应的应对策略。考虑到光伏电源的出力不确定性,提出了基于LSTM神经网络的DG输出功率预测模型,将预测值融合到电流保护整定公式中,实现了整定值的自适应调整。

According to the characteristics of the inverter distributed generation,considering the relationship between the variation of the output power of the photovoltaic power supply connected to the distribution network and the short-circuit current,the influence of the distributed generation on the traditional current protection is analyzed,and the corresponding countermeasures are proposed.Considering the uncertainty of photovoltaic power output,a prediction model of DG output power based on LSTM neural network is proposed.By integrating the predicted value into the setting formula of the current protection,the adaptive adjustment of the setting value is realized.