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Active Power Compensation of Microgrid Connected Systems

Anwar, Saeed
http://rave.ohiolink.edu/etdc/view?acc_num=akron1406653103

Abstract Details

2014, Master of Science in Engineering, University of Akron, Electrical Engineering.
The power quality of microgrids is one of the major issues in determining whether the microgrid is operating in grid connected (GC) mode or standalone (SA) mode. Power quality is degraded by harmonics, voltage unbalance, voltage sag and voltage swells. Harmonics cause performance degradation, aging, equipment heating and severe problems for critical loads that require very high power quality. In order to ensure the power quality of the grid and meet the standards, both active and passive power compensators are used. Due to the change in the coupling and inverter filter impedances in the microgrid, harmonics are not shared equally by the individual compensators. So, a particular inverter may be overstressed with the harmonic compensation operation. If the inverters in a decentralized microgrid structure are not adaptive, the system may be unstable due to inverter overloading. A novel adaptive harmonic compensation method for decentralized islanded microgrid structures is presented that incorporates the effect of line impedance parameter changes. The system can provide better harmonics sharing without any communication among the inverters or the central unit. For low harmonic current, the adaptive compensation system prioritizes voltage regulation at a Point of Common Coupling (PCC). For the GC mode of microgrid operation, the strategy to eliminate harmonics from the grid current as well as the PCC voltage for microgrid applications are presented in this dissertation. The position of the harmonics reduction unit is selected so that it can reduce the harmonic level of the grid current and PCC voltage harmonics irrespective of the distribution of the renewable energy sources in the microgrid. In the proposed control algorithm, the required amount of attenuation for the harmonics is determined to meet the THD requirement. A fast and efficient algorithm for phase detection irrespective of the presence of harmonics is used for the system. The effect of interharmonics and other disturbances on the phase detection system are presented. The role of a smart load in harmonic compensation is introduced through a dual boost PFC rectifier topology for input stage harmonic compensation. The effectiveness and performance of proposed methods are verified through simulations and experimental tests.
Yilmaz Sozer, Dr. (Advisor)
Malik Elbuluk, Dr. (Committee Member)
Tom T. Hartley, Dr. (Committee Member)
Seungdeog Choi, Dr. (Committee Member)
117 p.
Alternative Energy; Electrical Engineering; Energy

Recommended Citations

Citations

  • Anwar, S. (2014). Active Power Compensation of Microgrid Connected Systems [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1406653103

    APA Style (7th edition)

  • Anwar, Saeed. Active Power Compensation of Microgrid Connected Systems. 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1406653103.

    MLA Style (8th edition)

  • Anwar, Saeed. "Active Power Compensation of Microgrid Connected Systems." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1406653103

    Chicago Manual of Style (17th edition)

akron1406653103
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© 2014, some rights reserved.Creative Commons License Active Power Compensation of Microgrid Connected Systems by Saeed Anwar is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Akron and OhioLINK.