VSC-HVDC system-based on model predictive control integrated with offshore wind farms

Recently, the offshore wind farms (OWFs) have excellent potential in global power networks. So, the demand for high power and high-quality transmission system is becoming more pressing with the fast growth of OWFs. A promising solution is provided by the voltage source converter-high voltage direct current (VSC-HVDC) system. This paper proposes a control method for controlling the VSC-HVDC system to integrate OWFs into power grids based on model predictive control (MPC). To minimise the distortion and filtering of the harmonics injected into the utility grid, the receiving end converter of the VSC-HVDC system is connected with LCL filter. The proposed control strategy maintains active/reactive power-sharing with efficient regulation of AC voltage among the different OWFs operation conditions. The detailed system components modelling and simulation are executed in the MATLAB/Simulink environment, which is used to perform both dynamics and transient evaluation of the suggested control strategy. The acquired simulation results emphasize the capability of the proposed control strategy to maintain system stability under different operation conditions compared to the synchronous reference frame-based current limiting droop control method (SRF-based CLD).

Automated summary

This paper proposes a control method for VSC-HVDC system integrating OWFs into power grids based on model predictive control. The control strategy minimizes distortion and filtering of harmonics injected into the grid by connecting the receiving end converter with LCL filter, while maintaining active/reactive power-sharing and efficient regulation of AC voltage among different OWFs operation conditions. Simulation results demonstrate the capability of the proposed control strategy to maintain system stability under various operation conditions compared to SRF-based CLD method.