10kV配电网理论线损计算方法及应用对比

Theoretical Line Loss Calculation Method and Application Comparison for 10 kV Distribution Network

目前,10 kV配电网线损电量占整个电网线损电量的20%以上,是线损管理的重点,具有很大的降损潜力。随着分布式电源接入容量的不断增加,配电网结构愈加复杂,合理、准确地计算10 kV配电网理论线损率越来越受到重视。文章介绍了当前4种主流10 kV配电网理论线损计算方法,即等值电阻法、等效容(电)量法、前推回代法和潮流法。阐述了4种方法的计算原理、适用性及其优缺点,并结合实际算例,首次应用上述算方法对比计算了有源、无源接入2种工况下配电网的线损率,分析了各种方法计算结果的精度及小电源接入对配电网线损的影响,为10 kV配电网理论线损计算提供一定的借鉴与参考。

Currently,the line loss of 10 kV distribution network accounts for more than 20% of the total power line loss,which is the focus of line loss management and has great potential for loss reduction. With the continuous increase of distributed power access capacity and the complexity of the distribution network structure,reasonable and accurate calculation of the theoretical line loss rate of 10 kV distribution network has received more and more attention. This paper introduces the current four main linear 10 kV distribution network theoretical line loss calculation methods,namely equivalent resistance method,equivalent capacitance(electricity) method,forward and backward substitution method and power flow method. It expounds the calculation principle,applicability,advantages and disadvantages of various methods,and combines the actual calculation examples to compare the calculations for the first time. The source is connected to the line loss rate of the distribution network under two working conditions. The accuracy of the calculation results of various methods and the influence of small power supply on the line loss rate of the distribution network are analyzed,which provides a certain theoretical line loss calculation for the 10 kV distribution network.