Effect of PLL on transient performance of wind turbines generator under voltage phase jump

Abstract

With the increasing proportion of wind power installed capacity, the influences of transient characteristics of wind turbines generator on safety and stability of power grid is becoming more and more important. The rotor side of doubly fed induction generator (DFIG) is connected to the grid through a back-to-back inverter, and vector control based on phase-locking synchronisation is used generally. Phase-locked loop (PLL) drive internal potential phase changes to achieve synchronous operation with the grid. Therefore, PLL has great influence on transient characteristics of DFIG. A dynamic model of PLL is built in this study. Phase-locking performance of PLL under voltage phase jump is studied by changing its parameters, and its impact mechanism on transient characteristics of DFIG is proposed. Simulation models are built with DIgSILENT/PowerFactory. The influence of parameters of PLL on phase-locking performance of DFIG under voltage phase jump is simulated.

Keywords

• phase locked loops
• power grids
• wind power plants
• rotors
• power generation control
• synchronisation
• asynchronous generators
• wind turbines
• invertors
• machine vector control
• power system stability
• doubly fed induction generator
• DFIG
• phase-locking synchronisation
• phase-locked loop
• PLL
• internal potential phase changes
• transient characteristics
• phase-locking performance
• voltage phase jump
• transient performance
• wind turbines generator
• wind power installed capacity
• power grid safety
• power grid stability
• back-to-back inverter
• vector control
• DIgSILENT
• PowerFactory