Analysis of Short-circuit and Protection Failure Risk Considering Random Output of Distributed Photovoltaics

2017 International Conference on Environmental and Energy Engineering

生态环境科学;能源学

Da, Yao^1 ; Huan, Zhang^1 ; Wei, Deng^1

Maintenance Company, State Grid Hunan Electric Power Company, Changsha

410007, China^1

关键词: Breaking capacity;    Calculating model;    Current protection;    Distribution of fault current;    Photovoltaics;    Protection failure;    Random distribution;    Setting values;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/63/1/012004/pdf
DOI  :  10.1088/1755-1315/63/1/012004

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Distributed photovoltaics (DPV) will increase or shunt the fault current as a branch of the power supply. The random outputs of DPV will also cause a random distribution of fault current, while the breaking capacity of the breaker and the setting value of the current protection is pre-set value, and cannot flexibly change, so DPV will bring a certain degree of influence on the breaking margin and the sensitivity of protection. This paper makes probability distribution calculating model of fault current containing DPV, and takes IEEE 33-node system as an example, simulated the probability distribution of fault current at different penetration of DPV. Finally, from the two indicators of the breaking margin of breaker and the sensitivity of protection, analysed the protection failure risk after the access of DPV.