Research On Dynamic Security Region Construction And Transient Coordinated Control Based On Phase Trajectory Analysis

As the wide application of phasor measurement unit and wide area measurement system,the generators' response data information obtained in real-time monitoring has become the basis of the operation of the power grid operation.Using real-time measurement data to construct the electric power system security defense has become the development direction and research focus of security and stability of power system analysis.At the same time,the large scale of new energy,such as wind power,photovoltaic,distributed power supply,the new energy with the volatility and nonlinear has brought the huge challenge to the safe and stable operation of power grid.Based on the methodology of phase trajectory analysis,this paper studies the transient preventive control of power system in order to provide support for the real-time analysis system of system operators.The main tasks of this paper include:(1)As for the methodology of dynamic security region in transient preventive control,a practical dynamic security region based on phase trajectory analysis is proposed.The method using phase trajectory sensitivity compared with the traditional angle sensitivity has better linear fitting effect.It studies the sensitivity relationship between the phase trajectory for stability boundary functions and injection parameters change of space.It proposes a practical method to build dynamic security region around the leading buckling critical point.(2)For the transient stability problem in power system containing wind farm,this paper proposes a transient prevention and control method based on phase trajectory analysis.This method keeps the system transient stability to wind power fluctuations,at the same time,fully considering the power system economics indicators.It gets a method of wind power coordinated control strategy to meet the demand of operation scheduling personnel.Based on the IEEE standard calculation example system,the accuracy and effectiveness of the proposed method are verified.The research work can provide useful reference for the control decision of power system operators.