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Modeling and Analysis of the Dynamic Response of an Off-Grid Synchronous Generator Driven Micro Hydro Power System

Waqas Ali1 orcid Haroon Farooq1Akhtar Rasool2Intisar Ali Sajjad3Cui Zhenhua4Lin Ning4

1Department of Electrical Engineering (RCET Campus), University of Engineering and Technology, Lahore., Pakistan

2Department of Electrical Engineering, Sharif College of Engineering and Technology, Lahore,, Pakistan

3Department of Electrical Engineering, University of Engineering & Technology, Taxila, Pakistan

4 Hangzhou Regional Center (HRC) for Small Hydro Power, Hangzhou (National Research Institute for Rural Electrification, Ministry of Water Resources, People’s Republic of China), China

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Received: 17 Oct 2020; Revised: 15 Jan 2021; Accepted: 28 Jan 2021; Published: 1 May 2021; Available online: 1 Feb 2021.
Editor(s): Grigorios Kyriakopoulos
Open Access Copyright (c) 2021 The Authors. Published by Centre of Biomass and Renewable Energy (CBIORE)
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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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

 

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Keywords: Micro Hydro Power; Off-grid; Normal; Abnormal; Response; Regulation; Modeling; Simulation
Funding: National Key R&D Program of China (2016YFE0205900)

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