Voltage control strategy for hybrid new energy grid based on model predictive control

Abstract

The traditional grid connected control method for wind power generation is current source type grid following control with the goal of maximum power tracking. However, faults such as DC blocking and commutation failure may cause short-term idle power at the converter port and trigger transient overvoltage, endangering operational safety. To explore the supporting role of grid connected new energy stations in grid voltage stability, a transmission end power grid model was established including grid connected and grid following new energy stations. Based on this, a coordinated voltage regulation strategy based on model predictive control is proposed, which considers the grid connected point voltage and adds a feedback loop to adjust the reactive power control parameters of the wind turbine inverter, in order to maximize the dynamic reactive power reserve. Finally, a relevant simulation system was built on the PSCAD platform and the correctness of the theoretical analysis was verified.

Keywords

delivery end power grid / grid building/grid following wind turbines / transient overvoltage / model predictive control / coordinate voltage control strategy