中压配电网规划态线损计算方法

Line loss calculation for middle voltage distribution network planning

对规划电网线损的研究有助于对电网进行优化,提出降损节能目标。本文对规划态的中压配电网线损计算方法进行了研究。首先采用人工神经网络对线损的基本分量进行预测,根据影响线损的主要参数建立了线损预测的模型结构,考虑收集到的原始数据取值范围和单位等的差异,对样本中的自变量和因变量作了标准化处理,再用改进的BP算法对神经网络进行训练,改善了算法收敛的性能和提高了预测的准确度;然后对规划改造项目中影响线损率升降的主要因素计算分析,并用此结果修正BP算法中预测的线损值。通过对实际电网线损的计算,证明了本文所提方法的实用性。

The research on line loss for planning grid project is conducive to power grid optimization and energy conservation. In this paper, the method of loss calculation for middle voltage distribution networks is researched. First the artificial neural network is adopted to predict the basic component of line loss. Line loss forecast structure is modeled according to main factors that influence the line loss. In consideration of value range and the unit diversity of the collected original sample data, the independent and dependent variables of the sample are standardization processed. Then train the neural network with improved BP algorithm, the convergence performance and accuracy of prediction is grossly improved. Then the paper calculate and analyze the main factors that influence the loss rate of planning projects, finally correct the predicted loss value in BP algorithm with previous calculation results. An example will be taken to prove the proposed method for loss calculation in this paper practical.