COORDINATION PROTECTION SYSTEM DESIGN FOR INVERTER-BASED MICROGRID
In the inverter-based microgrid system, there is a problem with the small magnitude of short-circuit current contributed by the inverter. This happens because the components of the inverter, namely switches, which are usually IGBTs or MOSFETs, have a certain current limit that must not be exceede...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/65821 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | In the inverter-based microgrid system, there is a problem with the small magnitude
of short-circuit current contributed by the inverter. This happens because the
components of the inverter, namely switches, which are usually IGBTs or
MOSFETs, have a certain current limit that must not be exceeded to ensure the
components are not being damaged. The fault current contributed by this inverter
might be smaller than the conventional overcurrent relay pickup current which
results in no fault being detected. An alternative solution to overcome this problem
is to use a 51V relay which has a lower pickup current when detect a voltage drop.
In this case, the writer designing and evaluating overcurrent protection, protection
coordination, and the effect of using NGR in inverter-based microgrid systems.
Tests were carried out using DIgSILENT Power Factory for several generation
scenarios, fault impedance, and fault types. In conclusion the 51V relay is able to
overcome the insensitivity of conventional overcurrent relays, the coordination
between relays that had been carried out was good, and it is better not to use NGR
in an inverter-based microgrid system.
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