A Hierarchical Coordinative Control Strategy for Solid State Transformer Based DC Microgrids
A solid state transformer (SST), as a kind of energy router in the Energy Internet, provides a unified access point for AC or DC distributed power subjects. However, the DC-link capacitors inside the SST will suffer huge voltage fluctuations when the output power of the microgrid changes dramaticall...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-09-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/19/6853 |
| _version_ | 1827705203903692800 |
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| author | Zheng Li Tao Zheng Yani Wang Chang Yang |
| author_facet | Zheng Li Tao Zheng Yani Wang Chang Yang |
| author_sort | Zheng Li |
| collection | DOAJ |
| description | A solid state transformer (SST), as a kind of energy router in the Energy Internet, provides a unified access point for AC or DC distributed power subjects. However, the DC-link capacitors inside the SST will suffer huge voltage fluctuations when the output power of the microgrid changes dramatically. With respect to this problem, caused by the random and intermittent characteristics of distributed generation (DG), a hierarchical coordinative control strategy is proposed. Compared with the common independent control, the proposed method not only makes full use of the regulation capacity of super capacitors, but also enhances the dynamic power tracking speed and reduces the speed difference between different stages of an SST. The dynamic voltage response under the proposed method is analyzed in frequency domain and compared with the independent control. To validate the effectiveness of the coordinative control strategy, a simulation model of an SST-based grid-connected DC microgrid system is established, and the topology of the SST is improved. The voltage stability of the DC bus is compared under different control strategies, and the coordinative control strategy is also verified, effectively under transition conditions. |
| first_indexed | 2024-03-10T15:57:57Z |
| format | Article |
| id | doaj.art-8c728e315feb4e6997ab31bf73d7fa39 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T15:57:57Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-8c728e315feb4e6997ab31bf73d7fa392023-11-20T15:32:18ZengMDPI AGApplied Sciences2076-34172020-09-011019685310.3390/app10196853A Hierarchical Coordinative Control Strategy for Solid State Transformer Based DC MicrogridsZheng Li0Tao Zheng1Yani Wang2Chang Yang3Shaanxi Key Laboratory of Smart Grid, Xi’an Jiaotong University, Xi’an 710049, ChinaShaanxi Key Laboratory of Smart Grid, Xi’an Jiaotong University, Xi’an 710049, ChinaShaanxi Key Laboratory of Smart Grid, Xi’an Jiaotong University, Xi’an 710049, ChinaShaanxi Key Laboratory of Smart Grid, Xi’an Jiaotong University, Xi’an 710049, ChinaA solid state transformer (SST), as a kind of energy router in the Energy Internet, provides a unified access point for AC or DC distributed power subjects. However, the DC-link capacitors inside the SST will suffer huge voltage fluctuations when the output power of the microgrid changes dramatically. With respect to this problem, caused by the random and intermittent characteristics of distributed generation (DG), a hierarchical coordinative control strategy is proposed. Compared with the common independent control, the proposed method not only makes full use of the regulation capacity of super capacitors, but also enhances the dynamic power tracking speed and reduces the speed difference between different stages of an SST. The dynamic voltage response under the proposed method is analyzed in frequency domain and compared with the independent control. To validate the effectiveness of the coordinative control strategy, a simulation model of an SST-based grid-connected DC microgrid system is established, and the topology of the SST is improved. The voltage stability of the DC bus is compared under different control strategies, and the coordinative control strategy is also verified, effectively under transition conditions.https://www.mdpi.com/2076-3417/10/19/6853microgridsolid state transformer (SST)voltage stabilityhierarchical coordinative control strategy |
| spellingShingle | Zheng Li Tao Zheng Yani Wang Chang Yang A Hierarchical Coordinative Control Strategy for Solid State Transformer Based DC Microgrids Applied Sciences microgrid solid state transformer (SST) voltage stability hierarchical coordinative control strategy |
| title | A Hierarchical Coordinative Control Strategy for Solid State Transformer Based DC Microgrids |
| title_full | A Hierarchical Coordinative Control Strategy for Solid State Transformer Based DC Microgrids |
| title_fullStr | A Hierarchical Coordinative Control Strategy for Solid State Transformer Based DC Microgrids |
| title_full_unstemmed | A Hierarchical Coordinative Control Strategy for Solid State Transformer Based DC Microgrids |
| title_short | A Hierarchical Coordinative Control Strategy for Solid State Transformer Based DC Microgrids |
| title_sort | hierarchical coordinative control strategy for solid state transformer based dc microgrids |
| topic | microgrid solid state transformer (SST) voltage stability hierarchical coordinative control strategy |
| url | https://www.mdpi.com/2076-3417/10/19/6853 |
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