摘要
小容量高密度的分布式电源(distributed resources,DR)接入配电网将显著改变配电网的短路电流分布。传统的短路电流计算要求获取系统无源网络的节点导纳矩阵,而小容量分布式电源数量的大幅增加将使得节点导纳矩阵维数剧增,导致矩阵的存储空间与求逆计算时间增加,从而降低效率。针对该问题,基于二阶变系数差分方程,提出了含小容量高密度分布式电源的配电网短路电流计算方法。该方法的优点在于使得系统无源网络节点导纳矩阵的维数不随着分布式电源接入数量的增加而增加,从而显著降低了存储空间与计算时间。在IEEE测试系统中仿真算例验证了所提方法的正确性与高效性。
The introduction of numerous distributed resources（ DR） with small capacity into distribution network will significantly change the distribution of short circuit current. Traditional short circuit current calculation requires the nodal admittance Y matrix of system＇s passive network. However,numerous DR with small capacity will significantly increase the dimension of the nodal admittance Y matrix,which will cause the increase of the cost of storage and inverse computing of matrix so as to reduce the efficiency. Aiming at the problem,based on the second-order difference equation with variable coefficients,this paper proposes a calculation method for the short circuit current of distribution network integrated with numerous DR with small capacity. The advantage of the proposed method is that the dimension of nodal admittance Y matrix doesn＇t increase correspondingly with the amount increase of DR,which can reduce the storage space and computation time significantly. The simulation example in IEEE test system verifies the correctness and efficiency of the proposed method.
出处
《电力建设》
北大核心
2016年第5期118-124,共7页
Electric Power Construction
关键词
电力系统
分布式电源(DR)
短路电流
差分方程
power system
distributed resources（DR）
short circuit current
difference equation
