含分布式发电配电网故障区间定位的新方法  

New Approach of Fault Section Location in Distribution Network with DG

作　　者：吴磊[1] 廖秋萍[1] 吕林[1] 陈鹏[1] 

机构地区：[1]四川大学电气信息学院智能电网四川省重点实验室,成都610065

出　　处：《电力系统及其自动化学报》2015年第5期92-96,102,共6页Proceedings of the CSU-EPSA

摘　　要：传统故障定位方法用于含DG的配电网势必会造成判断矩阵和开关函数的构建过程非常复杂,影响故障定位的效率和准确性。将故障时上传继电保护和断路器分合信息作为判断因素,并充分考虑DG接入后配电网保护的配置和逻辑关系的变化,在传统故障定位数学模型中加入DG的数学表达,建立了一种适用于含DG的配电网故障定位数学模型,并且在目标函数中加乘了补偿因子。新的目标函数克服了在主保护、近后备保护拒动情况下,故障判断结果不唯一的问题,使故障区间定位的选择性更强,定位更加准确。通过算例分析,该数学模型能够对含DG配电网单重、多重故障进行准确定位,验证了本模型的适用性和准确性。The distributed network with DG make the establishment of switch function and judgment matrix extremely complex and affect the efficiency and accuracy of fault location when traditional optimization algorithms are applied to locate the fault points. A novel mathematical model for distributed network with DG based on relay and circuit breaker information when faults occurred was presented. Changes in the distribution network protection configuration and logi- cal relationship have been taken fully considered after the DG was accessed and the mathematical expression of DG was added in the traditional fault estimation mathematical model. Compensation factors were multiplied in the objective function. Non-uniqueness of fault location result was overcome when main and backup protect refuse operating. Selection and accuracy of fault location was improved by new objective function. Single and multiple fault of distributed net- work with DG can be located accurately. The validity and accuracy are confirmed by example analysis.

关 键 词：分布式电源 故障定位 适用性 准确性 

分 类 号：TM933[电气工程—电力电子与电力传动]