Coordination Design of Parameters of Additional Multi-controller in the Wind-PV-Thermal-Bundled Power Transmission System under Multiple Operation Modes

The wind-PV-thermal-bundled (WPTB) power transmission system can remedy the shortcomings of new energy generation methods, but there are still low frequency oscillation (LFO) problems caused by the random fluctuation and strong intermittency of wind power output. In this paper, unified power flow controller (UPFC), power system stabilizer (PSS) and Static synchronous compensator (STATCOM) are used to improve the stability of the transmission grid power system. The Latin hypercube sampling (LHS) is used to sample the actual wind power output. The average value of damping ratio of the key oscillation mode of the system under various wind power output is considered an objective function, and the dung beetle optimization (DBO) algorithm is used to optimize the key parameters of multiple controllers. The eigenvalue analysis and time domain simulation results on IEEE 4-machine 2-area connected to WPTB power transmission system show that the controller optimized by DBO algorithm can suppress the fluctuation of active power and power angle caused by LFO, and improve the system stability.