Generic power flow algorithm for bipolar DC microgrids based on Newton–Raphson method
This paper proposes a generic power flow algorithm for bipolar DC microgrids based on the Newton–Raphson (NR) method. The bipolar DC microgrid has gained considerable attention for its effectiveness and reliability with regard to power supply. To date, however, power flow algorithms for bipolar DC n...
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          | Published in | International journal of electrical power & energy systems Vol. 142; p. 108357 | 
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| Main Authors | , , | 
| Format | Journal Article | 
| Language | English | 
| Published | 
            Elsevier Ltd
    
        01.11.2022
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| Subjects | |
| Online Access | Get full text | 
| ISSN | 0142-0615 1879-3517  | 
| DOI | 10.1016/j.ijepes.2022.108357 | 
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| Abstract | This paper proposes a generic power flow algorithm for bipolar DC microgrids based on the Newton–Raphson (NR) method. The bipolar DC microgrid has gained considerable attention for its effectiveness and reliability with regard to power supply. To date, however, power flow algorithms for bipolar DC networks have not been fully investigated and generalized, although power flow analysis is an essential tool, with diverse applications ranging from network design to real-time control. In this study, a current injection-based power flow algorithm is established that considers the grounding scheme and voltage control method of energy source. Six bus types are defined, depending on the grounding scheme and voltage control combination. The unknown pole voltages and equations to be iteratively solved are identified. Afterwards, the unknown pole voltages are updated via a single NR method, which makes the proposed method straightforward and efficient. The case study validates that the proposed power flow algorithm can find the bus voltages of each pole sufficiently close to the simulation results of PSCAD/EMTDC, while having a low computational burden.
•Generic power flow algorithm for bipolar DC microgrids is proposed.•Proposed algorithm considers grounding schemes and control modes of energy sources.•Proposed algorithm aids various power system applications for bipolar DC microgrids.•Developed method has high accuracy and low computation time with single NR method. | 
    
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| AbstractList | This paper proposes a generic power flow algorithm for bipolar DC microgrids based on the Newton–Raphson (NR) method. The bipolar DC microgrid has gained considerable attention for its effectiveness and reliability with regard to power supply. To date, however, power flow algorithms for bipolar DC networks have not been fully investigated and generalized, although power flow analysis is an essential tool, with diverse applications ranging from network design to real-time control. In this study, a current injection-based power flow algorithm is established that considers the grounding scheme and voltage control method of energy source. Six bus types are defined, depending on the grounding scheme and voltage control combination. The unknown pole voltages and equations to be iteratively solved are identified. Afterwards, the unknown pole voltages are updated via a single NR method, which makes the proposed method straightforward and efficient. The case study validates that the proposed power flow algorithm can find the bus voltages of each pole sufficiently close to the simulation results of PSCAD/EMTDC, while having a low computational burden.
•Generic power flow algorithm for bipolar DC microgrids is proposed.•Proposed algorithm considers grounding schemes and control modes of energy sources.•Proposed algorithm aids various power system applications for bipolar DC microgrids.•Developed method has high accuracy and low computation time with single NR method. | 
    
| ArticleNumber | 108357 | 
    
| Author | Kim, Yun-Su Jeon, Jin-Hong Lee, Jin-Oh  | 
    
| Author_xml | – sequence: 1 givenname: Jin-Oh orcidid: 0000-0002-2566-7720 surname: Lee fullname: Lee, Jin-Oh organization: Korea Electrotechnology Research Institute, Gwangju 61751, Republic of Korea – sequence: 2 givenname: Yun-Su orcidid: 0000-0002-6803-929X surname: Kim fullname: Kim, Yun-Su email: yunsukim@gist.ac.kr organization: Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea – sequence: 3 givenname: Jin-Hong surname: Jeon fullname: Jeon, Jin-Hong organization: Korea Electrotechnology Research Institute, Gwangju 61751, Republic of Korea  | 
    
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| Keywords | Power flow analysis Grounding Voltage balancer Bipolar DC microgrid Droop control Newton–Raphson  | 
    
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| SubjectTerms | Bipolar DC microgrid Droop control Grounding Newton–Raphson Power flow analysis Voltage balancer  | 
    
| Title | Generic power flow algorithm for bipolar DC microgrids based on Newton–Raphson method | 
    
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