Virtual Resistance Control for Sequential Green-start of Offshore Wind
Power Plants
- Anubhav Jain ,
- Oscar Saborío-Romano ,
- Jayachandra Naidu Sakamuri ,
- Nicolaos Antonio Cutululis
Abstract
The changing energy landscape due to the large scale integration of
renewable energy and shutting down of conventional thermal plants has
opened up the potential of alternate sources in the blackstart services
market. Grid forming wind turbines can do controlled islanded operation
independent of an external grid voltage and thus, participate in network
restoration from the start. However, it is necessary to study the
capability of wind turbines to deal with the demanding energization
transients in a controlled and stable manner. This work investigates the
feasibility of using virtual resistance in the wind turbine converter
control to reduce transients during self-transformer inrush and
sympathetic interaction from downstream string transformers. This can
eliminate the need for pre-insertion resistors during sequential
energization. The sensitivity of the AC current and voltage output along
with DC link transient to the virtual resistance parameters has also
been analyzed using PSCAD simulations. Finally the effectiveness of the
proposed method for offshore network energization by a grid forming wind
power plant has been tested by comparing to results for a pre-insertion
resistor.