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MODELING, ANALYSIS AND CONTROL OF MIXED SOURCE MICROGRID

Renjit, Ajit Anbiah
http://rave.ohiolink.edu/etdc/view?acc_num=osu1450770774

Abstract Details

2016, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
Microgrids with natural gas engine driven distributed energy resources (DERs) are more likely to be favored by both industries and utilities in the near future because of their low costs, which, in turn, is due to the newly found shale deposits at many places in the world. Such DERs can be connected either directly or through an inverter to the utility/load. Therefore, they are referred to as synchronous generator-based DERs and inverter - based DERs respectively. In this research work, the synchronous generator-based DER and inverter-based DER installed at the CERTS Microgrid test bed have been modeled. The dynamic and steady-state performance of the models were evaluated by verifying the model results against experimental tests conducted at the CERTS microgrid. A key contribution of this modeling effort is that the developed models of the DERs are simple and can fairly represent to a reasonable degree of accuracy the dynamic behavior without infringing on the confidential information of the commercial equipment manufacturers. Such models can easily be multiplied wherever necessary with appropriate scaling to facilitate analysis of numerous scenarios and case studies that may be otherwise impractical due to resource limitations at the field site to undertake actual testing ¿ or at the very least expensive and time consuming. Also, the dissertation examines the stalling behavior of both the DERs. The DERs when operating under islanded conditions are susceptible to stalling and can bring down the entire industrial power system. Graphical and analytical methods involving the active power-frequency for synchronous generator-based DERs to determine its stalling conditions has been presented. Similarly, graphical methods involving active power-voltage characteristics for inverter-based DERs have been proposed and stalling analysis has been conducted. It is very common for one or more DERs in the islanded microgrid to operate closer to their maximum electrical and mechanical limits. During a large load change, such DERs may get temporarily overloaded until the other DERs with sufficient power margin takes the remaining load burden. Under such overloaded conditions, they exhibit a different dynamic behavior compared to normal operating conditions which requires thorough analysis. Therefore, the performance of interconnected DERs when they are operated against their mechanical limits in an islanded microgrid is also investigated. This research work also investigates the effect of prime-mover stalling in a mixed source microgrid comprising both synchronous generator- and inverter-based DERs. It was observed that the prime-mover stalling of any unit can lead to the collapse of entire microgrid system while operating in the islanded mode. Finally, a modified droop control scheme has been proposed for the inverter-based DERs that prevents prime-mover stalling in a mixed source microgrid.
Mahesh S Illindala, Dr (Advisor)
137 p.
Electrical Engineering
Microgrids, Distributed Generation, Distributed Energy Resource, Synchronous generators, Gensets, Inverter-based DERs, Synchronous generator-based DERs, Stalling

Recommended Citations

Citations

  • Renjit, A. A. (2016). MODELING, ANALYSIS AND CONTROL OF MIXED SOURCE MICROGRID [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1450770774

    APA Style (7th edition)

  • Renjit, Ajit Anbiah. MODELING, ANALYSIS AND CONTROL OF MIXED SOURCE MICROGRID . 2016. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1450770774.

    MLA Style (8th edition)

  • Renjit, Ajit Anbiah. "MODELING, ANALYSIS AND CONTROL OF MIXED SOURCE MICROGRID ." Doctoral dissertation, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1450770774

    Chicago Manual of Style (17th edition)

osu1450770774
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© 2016, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.