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.


Operation Analysis of an AC/DC Converter with Quasi-Active Power Factor Correction
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...
Operation of Three-Phase Power Factor Corrected (PFC) Rectifiers
Mazur, D. (2011-09-10)
Rectifier circuits make a large number of higher harmonics in the mains and lower the power factor (PF). To reduce this harmful effect, rectifier circuits with electronic control are introduced. This article presents two Power Factor Correction rectifier circuits: I- and 3 -phase circuits. We present here the method of controlling these rectifiers, that allows to increase the power factor of these rectifiers. In the article we present also an algorithms, that provide this controlling The simulation results ...
Chatter detection using vibrational and acoustic emissions in turning process
Süleyman, Büyükkoçak; Kılıç, Şener; Özer, Mehmet Bülent; Ünver, Hakkı Özgür (null; 2013-09-20)
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...
Optimal passive and hybrid control of vibrations and sound radiation from linear and non linear PZT based smart structures
Özer, Mehmet Bülent (2002-03-21)
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...
Selective Harmonic Elimination for Three-Phase Voltage Source Inverters Using Whale Optimizer Algorithm
Nalcaci, Gamze; Ermiş, Muammer (2018-05-05)
Selective Harmonic Elimination (SHE) shows superior harmonic performance at low switching frequencies to eliminate low-order harmonics and this property decreasing losses is a very effective way to reach higher efficiencies in power electronics applications. In this paper, Whale Optimizer Algorithm (WOA) is implemented to decide optimum switching angles for three-phase Voltage Source Inverter (VSI) of eliminating some high order harmonics while providing the required voltage. Besides, Particle Swarm Optimiz...
Citation Formats
M. Zia, “GRID RESILIENCY ISSUES WITH A HYBRID SOLAR-BATTERY SYSTEM,” M.S. - Master of Science, Middle East Technical University, 2021.