Current Restrained Undervoltage Protection of Converter Dominated Microgrid
Paper in proceedings, 2020

This paper presents a current restrained undervoltage protection method for converter dominated microgrids. Current magnitude based conventional protection fails to detect a fault in converter dominated microgrid due to current limiting capability of converters. Fault detection becomes more complicated during islanded operation of such a microgrid. This is because, the current does not exceed the rated value and remains below pickup setting of overcurrent relay during the fault. One alternative is to use undervoltage relay. However, this may not function correctly in the case of a fault at the end of a long cable or a high impedance fault. The current restrained undervoltage based proposed method does not rely on communication and the selectivity can be achieved by using a blinder in a VI-plane. Subsequently, the operating time of the relay is calculated using the index obtained from change in current and voltage inside the blinder. The performance of the proposed method is tested at different fault types and locations with different
fault resistance in a converter dominated microgrid.

Microgrid

converter interfaced DG

current control

overcurrent and undervoltage relay.

Author

Rabindra Mohanty

Chalmers, Electrical Engineering, Electric Power Engineering, Power grids and Components

Peiyuan Chen

Chalmers, Electrical Engineering, Electric Power Engineering, Power grids and Components

Anh Tuan Le

Chalmers, Electrical Engineering, Electric Power Engineering, Power grids and Components

International Conference on Developments in Power System Protection

Vol. Accepted for presentation 057

The 15th International Conference on Developments in Power System Protection
ACC Liverpool, ,

Areas of Advance

Energy

Learning and teaching

Pedagogical work

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering

More information

Latest update

1/11/2020