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44 results on '"Munir, Hafiz Mudassir"'

31. Edge Computing for IoT-Enabled Smart Grid

Author

Mehmood, M. Yasir, primary, Oad, Ammar, additional, Abrar, Muhammad, additional, Munir, Hafiz Mudassir, additional, Hasan, Syed Faraz, additional, Muqeet, H. Abd ul, additional, and Golilarz, Noorbakhsh Amiri, additional

Published
2021
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34. Control of distributed generators and direct harmonic voltage controlled active power filter for accurate current sharing and power quality improvement in islanded microgrid

Author

Munir, Hafiz Mudassir, Ghannam, Rami, Li, Hong, Younas, Talha, Golilarz, Noorbakhsh Amiri, Hassan, Mannan, and Siddique, Abubakar

Abstract

Harmonics are regarded as one of the main challenges in a microgrid. This issue may even get worse when different distributed generators (DGs) work together to solve the load sharing problems due to mismatched feeder impedances and diversified DG ratings. Even though load sharing can be achieved, the microgrid suffers from voltage unbalance and total harmonic distortion (THD) issues at the output of DG terminals as well as at the point of common coupling (PCC). Thus, in this paper, the power quality improving method is discussed, with a target of load sharing under the hierarchical control of different DG units and an active power filter (APF) in microgrids. To achieve this objective, we propose integrating a direct harmonic voltage controlled APF with DGs to improve their harmonic compensation performance. This proposed control scheme has many advantages over conventional control using a shunt resistive active power filter (R-APF) with voltage controlled DGs. First, based on the existing THD level of the PCC voltage, the proposed scheme provides improved voltage compensation and reduction in THD in the islanded microgrid. Secondly, equal load sharing can be achieved simultaneously. Thus, the proposed scheme provides better performance and a seamless interface as the proposed study mainly contains both the voltage controlled DGs and the local based voltage detection APF.

Published
2019

35. Direct harmonic voltage control strategy of shunt active power filters suitable for microgrid applications

Author

Munir, Hafiz Mudassir, Zou, Jianxiao, Xie, Chuan, Li, Kay, Younas, Talha, and Guerrero, Josep M.

Subjects
Distributed generation, Total harmonic distortion, Active power filter, Voltage harmonic compensation
Abstract

The application of shunt active power filters (S-APFs) is considered to be the most popular approach for harmonic compensation due to its high simplicity, ease of installation and efficient control. Its functionality mainly depends upon the rapidness and precision of its internally built control algorithms. A S-APF is generally operated in the current controlled mode (CCM) with the detection of harmonic load current. Its operation may not be appropriate for the distributed power generation system (DPGS) due to the wide dispersion of nonlinear loads. Despite the fact that the voltage detection based resistive-APF (R-APF) appears to be more appropriate for use in the DPGS, the R-APF experiences poor performance in terms of mitigating harmonics and parameter tuning. Therefore, this paper introduces a direct harmonic voltage detection based control approach for the S-APF that does not need a remote harmonic load current since it only requires a local point of common coupling (PCC) voltage for the detection of harmonics. The complete design procedure of the proposed control approach is presented. In addition, experimental results are given in detail to validate the performance and superiority of the proposed method over the conventional R-APF control. Thus, the outcomes of this study approve the predominance of the discussed strategy.

Published
2019

44. Cooperation of Voltage Controlled Active Power Filter with Grid-Connected DGs in Microgrid.

Author

Munir, Hafiz Mudassir, Zou, Jianxiao, Xie, Chuan, and Guerrero, Josep M.

Abstract

Due to the excessive use of nonlinear loads and inverter interfaced distributed generators, harmonic issues have been regarded as a major concern in power distribution systems. Therefore, harmonic compensation in microgrids is a subject of current interest. Consequently, a novel direct harmonic voltage-controlled mode (VCM) active power filter (APF) is proposed to mitigate the harmonics in a cooperative manner and provide a better harmonic compensation performance of less than 5%. Due to the dispersive characteristics of renewable energy resources, voltage feedback based on a harmonic compensation control loop is implemented for the first time. This system can be smoothly combined with the current control loop. Our method proposes a better performance while mitigating the harmonics in comparison with conventional resistive active power filters (R-APF). Based on direct voltage detection at the point of common coupling (PCC), the proposed VCM-APF can therefore be seamlessly incorporated with multiple grid-connected generators (DGs) to enhance their harmonic compensation capabilities. The advantage of this scheme is that it avoids the need for designing and tuning the resistance, which was required in earlier conventional control schemes of R-APF for voltage unbalance compensation. Additionally, our scheme does not require the grid and load current measurements since these can be carried out at the PCC voltage, which further reduces the implementation cost of the system. Furthermore, the simulation results show the significance of proposed method. [ABSTRACT FROM AUTHOR]

Published
2019
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