基于负荷获取和匹配潮流方法的配电网理论线损计算

提出了一种适用于任意自动化配置的配电网理论线损计算方法.分析了传统方法的假设条件对结果的影响后,指出合理地获取负荷和基于该负荷的潮流计算是准确计算线损的关键.首先将配电网负荷和支路信息分为5种类型,通过支路信息可以将原网络分解为若干个等效网络,从而降低负荷获取的复杂性,提高获取精度:其次为无自动化量测的负荷用户设置的假设条件也最大限度地满足工程需求,最后将所有获取负荷的计算统一为期望负荷分配因子和期望负荷的计算.根据不同置信度的期望负荷为配电网匹配潮流提供负荷数据,在进一步利用冗余信息修正负荷的基础上,得到了理论线损计算结果.算例结果表明,该方法能够为运行人员提供更加精确和全面的线损信息.

DISTRIBUTION SYSTEM THEORETICAL LINE LOSS CALCULATION BASED ON LOAD OBTAINING AND MATCHING POWER FLOW

A theoretical line loss calculation method for distribution network, which is suitable to any automation device configuration, is proposed. The influence of assumed condition of traditional method on calculation results is analyzed. The authors point out that rational load obtaining and the power flow calculation based on it are the key problems of accurate line loss calculation. Firstly, the load in distribution network and the branch information are classified by five kinds, and the initial distribution network is divided into some equivalent sub-networks by information of lines to reduce the complexity and improve the accuracy of load obtaining. Secondly, The engineering demand is satisfied as much as possible by the assumptions adopted for the load users not equipped with automatic metering devices. Finally, all of the calculations for load obtaining are unified as the calculation of expected load distribution factors and expected load. In addition, the obtained expected loads with different confidence provide load data for matching power flow method, on the basis of further modifying the load the theoretical line loss is calculated. Calculation example results show that this method can offer overall and more accurate information of line loss to the operators.