高渗透率有源配电网的短路电流计算  

Short-Circuit Current Calculation for Distribution Network with Distributed Generators Considering High Penetration Level

作　　者：李英量 王德明 王康 谢华儒[2] 高炜欣[1] 朱琦 LI Yingliang;WANG Deming;WANG Kang;XIE Huaru;GAO Weixin;ZHU Qi(School of Electronic Engineering,Xi an Shiyou University,Xi an 710065,China;Jinchuan Group Co.,Ltd.,Jinchang,Gansu 737100,China)

机构地区：[1]西安石油大学电子工程学院,西安710065 [2]金川集团股份有限公司,甘肃金昌737100

出　　处：《南方电网技术》2021年第7期61-66,共6页Southern Power System Technology

基　　金：陕西省自然科学基础研究计划资助项目(2020JM-542);国家自然科学基金企业创新发展联合基金重点项目(U20B2029);西安石油大学研究生创新与实践能力培养项目(YCS20212107)。

摘　　要：常规有源配电网的短路计算方法利用节点阻抗矩阵迭代求解,在分布式电源(distributed generator,DG)渗透率较高的情况下存在计算量大、计算时间长的问题。为此,提出了基于故障分量叠加和等值补偿原理的有源配电网故障计算新方法。该方法利用改进的前推回代法求解电压正常分量和故障分量,采用多端口等值补偿法处理合环支路,可用于求解含DG辐射网和弱环网的短路电流。通过算例仿真计算并与常规方法相比较,验证了所提方法的有效性。该方法不需要生成和处理系统节点阻抗矩阵,计算量小、计算时间短,具有较强的适应性。The general short-circuit current calculation method for distribution networks connected with distributed generations(DGs)uses nodal impedance matrix and iteration procedure,which needs more calculation steps and takes longer calculation time during high penetration level when penetration level of distributed generators is high.A new short-circuit calculation method is proposed based on the fault components superposition and equivalent compensation theorem.The new method uses the improved backward/forward sweep(BFS)method to estimate the normal and fault voltage components.The multiport equivalent compensation method is utilized in the looped systems.The proposed method can calculate short-circuit currents in radial networks as well as weakly meshed networks with DGs.Different cases are studied using the proposed and general methods,and results are examined by the simulations in MATLAB/Simulink.The comparison verifies the validity of the proposed method.The new method can obtain results without using the node impedance matrix and the calculation amount and time are less than the conventional methods,which can be used in radial and weakly meshed distribution networks with DG connection.

关 键 词：配电网 分布式电源 高渗透率 短路电流计算 弱环网 

分 类 号：TM712[电气工程—电力系统及自动化]