Genetic algorithm-based optimal overcurrent relays coordination for standalone sustainable hydrokinetic renewable energy distribution network
The Standalone Sustainable Hydrokinetic Renewable Energy Distribution Network (SHRE-DN) system is a very unique distribution system. SHRE-DN is an off grid system and use a hydrokinetic concept which turn the river stream into a power generation source. The development SHRE-DN is to...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/84379/1/FK%202019%20139%20-%20ir.pdf |
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| Summary: | The Standalone Sustainable Hydrokinetic Renewable Energy Distribution Network (SHRE-DN)
system is a very unique distribution system. SHRE-DN is an off grid system and use a hydrokinetic
concept which turn the river stream into a power generation source. The development SHRE-DN is to
develop rural electrification system for native long houses along the river. The research study is
tested on a DigSILENT develop model of the SHRE-DN and in accordance with all respectively unique
parameters and relevant standards such as IEC or IEEE standard which is compulsory to comply for
the relay protection scheme. The most commodious protection devices are overcurrent relays (OCRs)
which responsible to isolate and clear a fault occurred into the distribution network.
Generally, OCRs work in pairs knows as primary relay and backup relay. The primary relay must trip
first in order to clear and isolate the fault accordingly. In the event of the primary relay is
fail to trip or malfunction, the backup up relay must then took a place to trip and clear
the faults. These relay must be set precisely so that the fault clearance can be done as
shortest possible time to avoid undesirable tipping of the relays. Since SHRE-DN is a new
standalone distribution system, an efficient and properly coordinated overcurrent protection system
must be provided and it poses a great challenge to protection coordination scheme
setup, due to the unique network topology. Improper and miscoordination among OCRs can result
in maloperation of the protection system that can lead to false tripping and an unnecessary
outage and power system instability. Thus, the objective of this work is to employ
Genetic Algorithm (GA) technique in Matlab/Simulink for optimal overcurrent
coordination and settings among all OCRs in the SHRE-DN in order to improve the speed of OCR
tripping operation. OCRs depend on its Time Dial Setting (TDS) values which effect the
operating time of the relays. This research work propose the artificial intelligent (AI) solution on the objective function (OF)
formulation, with the application of genetic algorithm (GA) optimization solver, to determine each
relay best optimal operation for the TDS value and response time to fault accordingly and also
eliminate miscoordination among the relays. GA are good at taking larger, potentially huge,
search space and navigating them looking for optimal combinations of things and solution.
Furthermore, the project is fast track and requiring the simplest method available. In
this strategy, all TDS values belonging to the respective relays are given to the
algorithm in order to get the optimized value of the TDS. The obtained optimized TDS
Values from the GA Optimization Technique in Matlab/Simulink Toolbox produce about 20% and
almost 52% improvement for each OCRs respectively. Overall improvement of the operating
time for the protection scheme for the distribution network is about 36% of an
improvement as compared to the conventional technique and approach in OCRs coordination and
setting for the distribution network. Thus, the objective of this work to provide the
most proper and efficient for the SHRE-DN is successfully
achieved. |
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