中低压配电一体化理论线损计算技术研究与应用

发布时间：2018-04-22 16:42

本文选题：配电网 + 快速Ybus高斯法　；参考：《华北电力大学(北京)》2017年硕士论文

【摘要】：目前配电网是电网的薄弱环节,配电网线损严重就是其中一个重要问题,解决方法的关键一步是准确计算理论线损。但是传统的理论线损计算方法计算结果误差大、精度低,不能准确反映想实际线损情况。因此,高精度的理论线损计算方法逐渐受到了人们的重视,潮流法就是其中之一。课题以提高理论线损计算准确度为目标,研究潮流法在理论线损计算中的应用,设计并开发中低压配电一体化理论线损计算软件。理论研究方面,本文对快速Ybus高斯法和电流注入型牛顿法的单相潮流模型进行研究,并利用平均功率的方法提出在理论线损计算中的应用方案。然后本文将包括电力元件在内的单相潮流模型扩展到三相潮流模型,并在第二章的基础上,提出三相潮流在理论线损计算中的应用方案。其中,快速Ybus高斯法采用相分量以更好地应对三相负荷不对称问题,电流注入型牛顿法采用直角坐标系进行程序设计。两种潮流算法的三相模型都详细介绍了PV节点的处理方式,因为PV节点需要根据发电机内部电压电流关系增加约束方程,才能满足潮流计算条件。实践应用方面,本文将所研究的潮流算法与数据库接口技术、重载算法、稀疏技术相结合,设计并开发中低压配电一体化理论线损计算软件。软件实现了对单相系统和三相系统的统一计算,可以准确详细地得到系统中每条线路的理论线损,很大程度地提高了理论线损计算的准确性。最后本文使用IEEE单相和三相标准算例验证了算法的正确性;使用33节点配电网系统验证了三相负荷不对称对理论线损的影响;使用实际算例验证了软件的实用性。结果表明软件收敛稳定、快速,可以应对多种不同情况的系统。
[Abstract]:At present, distribution network is the weak link of power network, the serious line loss of distribution network is one of the important problems. The key step to solve the problem is to calculate the theoretical line loss accurately. However, the traditional theoretical line loss calculation method can not accurately reflect the actual line loss due to its large error and low accuracy. Therefore, high-precision theoretical line loss calculation methods have been paid more and more attention, among which power flow method is one of them. In order to improve the accuracy of theoretical line loss calculation, the application of power flow method in theoretical line loss calculation is studied, and the software of theoretical line loss calculation for medium-low voltage distribution integration is designed and developed. In theory, this paper studies the single-phase power flow model of the fast Ybus Gao Si method and the current injection Newton method, and puts forward the application scheme in the theoretical line loss calculation by using the average power method. Then the single-phase power flow model, including power components, is extended to the three-phase power flow model, and based on the second chapter, the application scheme of three-phase power flow in theoretical line loss calculation is proposed. Among them, the fast Ybus Gao Si method adopts phase component to deal with the problem of three-phase load asymmetry better, and the current injection Newton method adopts the right-angle coordinate system for programming. The three phase models of the two power flow algorithms both introduce the processing methods of PV nodes in detail because PV nodes need to increase the constraint equation according to the relationship between voltage and current in order to meet the power flow calculation conditions. In the aspect of practical application, this paper combines the power flow algorithm with database interface technology, heavy load algorithm and sparse technology to design and develop the software for line loss calculation of the theory of integration of middle and low voltage distribution. The software realizes the unified calculation of single-phase system and three-phase system, and the theoretical line loss of each line in the system can be obtained accurately and in detail, which greatly improves the accuracy of theoretical line loss calculation. Finally, the IEEE single-phase and three-phase standard examples are used to verify the correctness of the algorithm; the 33-bus distribution network system is used to verify the influence of three-phase load asymmetry on the theoretical line loss; the practical example is used to verify the practicability of the software. The results show that the software converges stably and quickly, and can deal with many different situations.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM744

【参考文献】