Study on optimal configuration of energy-dissipating resistors in VSC-HVDC system for new energy island

Abstract

In VSC-HVDC system for new energy island， surplus power consumption in the system during fault ride-through （FRT） is achieved by employing grouped AC energy-dissipating resistors of equal capacity. However， the presence of an excessively powered resistor group can inflict severe impacts on the system. Therefore， a novel optimal configuration method for energy-dissipating resistors with different capacities based on progression conversion and the switching strategy are proposed. Firstly， the operational characteristics of the grouped AC energy-dissipating resistors of equal capacity are analyzed. Subsequently， multiple groups of AC energy-dissipating resistors with varying capacities， collectively equivalent to the total capacity of the VSC-HVDC system， are configured， and different combinations of the resistors are employed to obtain varying dissipating powers. Finally， a model of the integrated grid is constructed and validated using the PSCAD/EMTDC simulation platform. Simulation results demonstrate that the proposed method and switching strategy enhance the precision of resistor switching， mitigate system impacts， shorten fault recovery time， and precisely consumes surplus power during fault ride-through.

Keywords

• vsc-hvdc
• frt
• surplus power
• energy dissipation device
• binary