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All Journal International Journal of Renewable Energy Development Logistic and Operation Management Research
Ali, Waqas
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Chemistry Decision Sciences, Operations Research & Management Energy

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Modeling and Analysis of the Dynamic Response of an Off-Grid Synchronous Generator Driven Micro Hydro Power System Ali, Waqas; Farooq, Haroon; Rasool, Akhtar; Sajjad, Intisar Ali; Zhenhua, Cui; Ning, Lin
International Journal of Renewable Energy Development Vol 10, No 2 (2021): May 2021
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2021.33567

Abstract

This paper models and analyses the dynamic response of a synchronous generator driven off-grid micro hydro power system using Simulink tool of MATLAB software. The results are assessed from various perspectives including regulation through no load to full load and overload scenarios under normal and abnormal operating conditions. The investigation under the normal conditions of no load, linearly changing load and full load divulges that the system operates in a satisfactory manner as generator voltage and frequency remain approximately constant at 1 pu. However, at full load generator voltage and frequency drop 3% and 0.5% respectively from its nominal values but remain within prescribed standard IEC limits. The results also expose that the abnormal conditions produced by abrupt changes in load, system faults and severe overload, cause the unwonted variations in the magnitude of generator parameters. Moreover, the study reveals that the system stability significantly enhances when the system is run at full load because the regulation time to fix the variations in the generator parameters; except input mechanical power; decreases, e.g. from 4.1 sec to 0.8 sec for generator voltage, with the increase in the loading from quarter to full load respectively at unity power factor. Further, it is also observed that the regulation time rises, e.g. from 0.8 sec to 1.3 sec for generator voltage, with the reduction in load power factor from unity to 0.8, respectively. Thus, proper protection, to cater for increased fault current at full load and power factor correction must be provided to improve the system stability and protection. Furthermore, it is also concluded that the over loading in any case should be strongly avoided in this type of system and it should never be allowed to exceed 20% of the full load value to avoid system failure 
Risk Management Nexus by Pakistan and China to Combat Novel Corona Virus in the Light of Actor-Network Theory Ghulam, Wajahat Ali; Ali, Shujahat; Ali, Waqas
Logistic and Operation Management Research (LOMR) Vol. 2 No. 1 (2023): Logistic and Operation Management Research (LOMR)
Publisher : Research Synergy Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31098/lomr.v2i1.1311

Abstract

This research paper presents the COVID-19 situation and early control measures the Government of Pakistan took. The first coronavirus case was confirmed in Pakistani on February 25, 2020. To avoid any disastrous situation, The Pakistani Government has done everything possible to reduce the number of coronavirus cases across its provinces as much as possible up until now. We have investigated Pakistan's thorough response compared to the neighboring country China. The researcher performed trend analysis based on the data from the official COVID-19 record website of the government of Pakistan and GitHub - JHU CSSE for China. The data indicates a decline in COVID-19 cases and a high recovery rate in Pakistan. No double-figure positive cases from the last few weeks are recorded as of March 16, 2023. We have compared the strategies of Pakistan to combat COVID-19 with China as it shut down its border from March 2020 to October 2023 to protect its social system. On the other hand, Pakistan didn't shut down the border completely during COVID-19. According to the findings, we can state that no large-scale death toll has been recorded in Pakistan. Pakistan maintains its survival during COVID-19 due to the efficient cooperation of the stakeholders in the light of the Actor-Network Theory. Despite the lack of effective antiviral treatment, Pakistan took proactive steps to combat coronavirus. Furthermore, the lockdowns and other preventative measures implemented by the provincial governments led to decreased COVID-19 cases in the nation. The fact that only 4% of Pakistan's population is over 60 indicates less risk of a COVID-19 outbreak leading to a large-scale death toll. Despite the lack of effective antiviral treatment, Pakistan took proactive steps to combat coronavirus.
Co-Authors Ali, Shujahat Farooq, Haroon Ghulam, Wajahat Ali Ning, Lin Rasool, Akhtar Sajjad, Intisar Ali Zhenhua, Cui