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| Calculation and analysis of short-circuit fault of distribution network with high proportion distributed generators based on aggregated current |
| DOI：10.19783/j.cnki.pspc.240672 |
| Key Words:distributed generation fault analysis method aggregated short-circuit current fault law |
| Author Name | Affiliation | | ZHAO Shuxin1,2 | 1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power
University), Beijing 102206, China
2. AVIC Jonhon Optronic Technology Co., Ltd., Luoyang 471003, China
State Grid Jibei Electric Power Research Institute, Beijing 100045, China | | XIAO Shiwu1 | 1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power
University), Beijing 102206, China
2. AVIC Jonhon Optronic Technology Co., Ltd., Luoyang 471003, China
State Grid Jibei Electric Power Research Institute, Beijing 100045, China | | LIANG Weichen3 | 1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power
University), Beijing 102206, China
2. AVIC Jonhon Optronic Technology Co., Ltd., Luoyang 471003, China
State Grid Jibei Electric Power Research Institute, Beijing 100045, China |
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| Abstract:The large number and dispersed access points of distributed generators (DGs), and the output characteristics during faults depending on their low voltage ride through control strategy, make it difficult to derive analytical expressions of fault current and voltage in the distribution network, as well as explain the mechanism and law of fault current and voltage changes. In order to solve these problems, a short-circuit fault calculation and analysis method of distribution network with high proportion DGs based on aggregated current is proposed. First, DGs are classified and aggregated based on their locations, considering their different influence on the branch short-circuit current. A nodal impedance matrix is then formed by a path matrix to determine the aggregation location. Next, the analytical expressions of short-circuit fault current and voltage calculation based on the aggregated short-circuit current are derived. Furthermore, based on the aggregated short-circuit current and analytical expressions, the impact of DGs connection on fault current and voltage is analyzed from a mechanistic perspective, exploring the variation patterns of fault current and voltage with respect to aggregated short-circuit current. Finally, case studies verify the correctness of the proposed fault calculation and analysis method. |
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