Zia, Moaz
Harmonics are one of the main power quality issues which needs to be addressed while designing a microgrid. If harmonics are present in the system, they can cause the load to malfunction and damage. With increasing number of non-linear loads and integration of distributed generators (DG) into the power system, harmonic mitigation is of paramount importance. There is a lot of work available in literature which deduce the benefits of integrating battery into the microgrid to improve renewable energy source (RES) fraction but very few studies go over the effect of battery on the power quality of the system. This study presents a detailed analysis of the effect of battery integration on the harmonics of the interfacing converter (IFC) output of PV microgrid. A resonant converter (RSC) controller with a voltage controller is used for the IFC control. For a comparative analysis, the THD for the PV-battery microgrid is compared with the THD of a standalone PV system. The simulation shows that upon integrating the battery the THD of the unfiltered converter output voltage increases from 33.89% to 40.75%. But after filtration of the higher order harmonics, the THD for PV-battery microgrid is 1.89% whereas for the PV microgrid is 2.34%. This shows that the integration of battery increases the high order harmonics due to unbalance in DC-link voltage during switching of charging states of the battery but complements the IFC control to reduce the lower order harmonics. Hence after filtration, the THD of the system is less if there is battery integration. The unbalance generated by battery is also under the acceptable IEEE limits. The impact of battery on the stability of the DC-link and minimizing the reactive power at the output is also discussed. Integration of battery helps in keeping the DC-link voltage more stable leading to lesser amount of reactive power at the output. This is a big advantage of using batteries especially in a weak grid where IFC needs to compensate large amount of reactive power.


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Rahmatian, M.; Moghani, J. Sh.; Abdi, B.; Gharehpetian, G. B. (2011-09-10)
In this paper an attempt has been made to analysis the operation of an ac/dc converter with quasi-active power factor correction. This investigation has been made in two steps. In the first step, an analytical investigation is made considering some logical assumptions. In the second step, one of the assumptions has been neglected for a more precise analysis and the principal operation of the circuit has been investigated analytically again. To confirm the accuracy of the theoretical analysis results, the ci...
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Chatter vibration is a longstanding problem for machining industry. It lowers both surface finish quality and life of cutting tool. In this study, real time chatter vibration detection system is designed and tested experimentally. A traditional lathe, equipped with two accelerometers placed on cutting tool in two orthogonal coordinates and a microphone, is used for machining a steel rod in face turning operation. During cutting process analog data of accelerometers and microphone is acquired by data acquisi...
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Two different methods are introduced for the determination of optimal active control inputs and passive shunting parameters in the PZT-based smart structure vibration and sound pressure control problems. The first method makes use of the dynamic vibration absorber principle; the second method uses the receptance of the open circuit structure-PZT system for determination of active control laws and parameters of optimal passive shunting. The advantages of each method are discussed. Using both methods, optimal...
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This paper focuses on the determination of suitable carrier based pulse width modulation (PWM) switching and control methods for grid connected modular multilevel converters (MMCs). Characterization of various level-shifted and phase-shifted carrier based PWM methods are provided in terms of output voltage waveforms both for N+1 and 2N+1 level output phase voltages. Carrier based PWM method based control approaches are evaluated for MMC. Performances of different control methods are evaluated and compared f...
Citation Formats
M. Zia, “GRID RESILIENCY ISSUES WITH A HYBRID SOLAR-BATTERY SYSTEM,” M.S. - Master of Science, Middle East Technical University, 2021.