Load Sharing Scheme Incorporating Power Security Margins for Parallel Operation of Voltage Source Inverters
The interconnection of distributed energy resources (DERs) in microgrids (MGs) operating in both islanded and grid-connected modes require coordinated control strategies. DERs are interfaced with voltage source inverters (VSIs) enabling interconnection. This paper proposes a load demand sharing sche...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/18/5825 |
| _version_ | 1797519428015882240 |
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| author | Chiebuka Eyisi Qifeng Li |
| author_facet | Chiebuka Eyisi Qifeng Li |
| author_sort | Chiebuka Eyisi |
| collection | DOAJ |
| description | The interconnection of distributed energy resources (DERs) in microgrids (MGs) operating in both islanded and grid-connected modes require coordinated control strategies. DERs are interfaced with voltage source inverters (VSIs) enabling interconnection. This paper proposes a load demand sharing scheme for the parallel operation of VSIs in an islanded voltage source inverter-based microgrid (VSI-MG). The ride-through capability of a heavily loaded VSI-MG, where some of the VSIs are fully loaded due to the occurrence of an event is investigated. In developing analytical equations to model the VSI, the concept of virtual synchronous machines (VSM) is applied to enable the VSI mimic the inertia effect of synchronous machines. A power frame transformation (PFT) that takes the line ratios of the MG network into account is also incorporated to yield satisfactory transient responses of both network frequency and bus voltages in the MG network. A Jacobian-based method is then developed to take into account the operational capacity of each VSI in the VSI-MG. The resulting amendable droop control constrains the VSIs within their power capabilities when an event occurs. Simulation results presented within demonstrate the effectiveness of the proposed procedure which has great potential to facilitate efforts in maintaining system reliability and resiliency. |
| first_indexed | 2024-03-10T07:42:39Z |
| format | Article |
| id | doaj.art-7c1bbd3228a0407480168f92b27944db |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T07:42:39Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-7c1bbd3228a0407480168f92b27944db2023-11-22T12:53:38ZengMDPI AGEnergies1996-10732021-09-011418582510.3390/en14185825Load Sharing Scheme Incorporating Power Security Margins for Parallel Operation of Voltage Source InvertersChiebuka Eyisi0Qifeng Li1Department of Electrical and Computer Engineering, University of Central Florida, Orlando, FL 32816, USADepartment of Electrical and Computer Engineering, University of Central Florida, Orlando, FL 32816, USAThe interconnection of distributed energy resources (DERs) in microgrids (MGs) operating in both islanded and grid-connected modes require coordinated control strategies. DERs are interfaced with voltage source inverters (VSIs) enabling interconnection. This paper proposes a load demand sharing scheme for the parallel operation of VSIs in an islanded voltage source inverter-based microgrid (VSI-MG). The ride-through capability of a heavily loaded VSI-MG, where some of the VSIs are fully loaded due to the occurrence of an event is investigated. In developing analytical equations to model the VSI, the concept of virtual synchronous machines (VSM) is applied to enable the VSI mimic the inertia effect of synchronous machines. A power frame transformation (PFT) that takes the line ratios of the MG network into account is also incorporated to yield satisfactory transient responses of both network frequency and bus voltages in the MG network. A Jacobian-based method is then developed to take into account the operational capacity of each VSI in the VSI-MG. The resulting amendable droop control constrains the VSIs within their power capabilities when an event occurs. Simulation results presented within demonstrate the effectiveness of the proposed procedure which has great potential to facilitate efforts in maintaining system reliability and resiliency.https://www.mdpi.com/1996-1073/14/18/5825AC microgriddistributed energy resourcesdroop controltransient stabilitypower sharingvoltage source inverter (VSI) |
| spellingShingle | Chiebuka Eyisi Qifeng Li Load Sharing Scheme Incorporating Power Security Margins for Parallel Operation of Voltage Source Inverters Energies AC microgrid distributed energy resources droop control transient stability power sharing voltage source inverter (VSI) |
| title | Load Sharing Scheme Incorporating Power Security Margins for Parallel Operation of Voltage Source Inverters |
| title_full | Load Sharing Scheme Incorporating Power Security Margins for Parallel Operation of Voltage Source Inverters |
| title_fullStr | Load Sharing Scheme Incorporating Power Security Margins for Parallel Operation of Voltage Source Inverters |
| title_full_unstemmed | Load Sharing Scheme Incorporating Power Security Margins for Parallel Operation of Voltage Source Inverters |
| title_short | Load Sharing Scheme Incorporating Power Security Margins for Parallel Operation of Voltage Source Inverters |
| title_sort | load sharing scheme incorporating power security margins for parallel operation of voltage source inverters |
| topic | AC microgrid distributed energy resources droop control transient stability power sharing voltage source inverter (VSI) |
| url | https://www.mdpi.com/1996-1073/14/18/5825 |
| work_keys_str_mv | AT chiebukaeyisi loadsharingschemeincorporatingpowersecuritymarginsforparalleloperationofvoltagesourceinverters AT qifengli loadsharingschemeincorporatingpowersecuritymarginsforparalleloperationofvoltagesourceinverters |