Parameter Identification And High Voltage Ride Through Research Of Doubly-fed Wind Turbin

Based on the operating principle,wind turbines can be divided into many types,among which the doubly fed induction generator(DFIG)currently dominates.In the process of wind turbine operation,there are situations such as ageing and wear and tear of the wind turbine,so there are certain deviations between the wind turbine model and the actual wind turbine parameters,bringing uncertainty to the power system tide calculation and stability analysis,etc.It is crucial to carry out research on the accurate identification of wind turbine parameters to improve this situation.In this paper,we carry out research on the identification of parameters of doubly-fed wind turbines and high-voltage ride-through in conjunction with current research results on intelligent algorithms,with the following main work:(1)The basic working principle and structure of doubly-fed wind turbines are introduced,the working principle and operating conditions of doubly-fed asynchronous induction generators are briefly described,the mathematical models of the wind turbine,drive chain and doubly-fed motor of doubly-fed wind turbines in three-phase stationary and two-phase orthogonal coordinate systems are established,and the directional vector control of the stator magnetic chain of doubly-fed induction generators is introduced.(2)The algorithmic principles of the grey wolf optimization algorithm(GWO)and the adaptive grey wolf algorithm based on information sharing search strategy(ISIAGWO)are introduced.In order to compare and cite another improved grey wolf optimization algorithm(IGWO),the algorithm test function analysis compares the merit-seeking ability and convergence speed of the three algorithms,and finally the ISIAGWO algorithm is selected for the parameter identification of doubly-fed wind turbines,and a mathematical model for the parameter identification of doubly-fed wind turbines is derived.(3)The structure of parameter identification in this paper is introduced,and a model of a doubly-fed wind turbine connected in parallel to an infinite grid is built in Matlab/Simulink simulation software.The trajectory sensitivity analysis is carried out by collecting the outlet current of the doubly-fed wind turbine to analyse the identifiability of the required parameters,and the identification of the stator and rotor resistance and inductance of the doubly-fed wind turbine is completed in the simulation using the GWO,IGWO and ISIAGWO algorithms.(4)The requirements of China’s wind turbine high-voltage ride-through standard were combined with the analysis and derivation of its transient characteristics during high-voltage ride-through,and the simulation model of double-fed wind turbine highvoltage ride-through was built in Matlab/Simulink simulation software to complete the high-voltage ride-through simulation.