Research On The Key Problems Of Wind Power System

To solve the problem caused by energy crisis and environmental pollution,the researches and application on new energy resources has been paid more attentions.In order to ensure energy security and diversification of energy sources,also to cope with climate change,countries are actively developing renewable energy.Wind energy is inexhaustible,clean,non-pollution.renewable energy.During these years,wind power generation technology has improved a lot.The integration of large-scale wind farms has a very important impact on the system transient stability.In this dissert,researches on power flow and transient stability of power systems integrated with large scale wind farms have been carried out.The main work is given as follows.Firstly,the current wind generation systems are described.Researches are carried on the model of typical double fed wind power generation and direct-drive wind power generation.From the control principle of two kinds of wind generation,mathematical model of all modules in wind generation are given.Secondly,steady-state power flow characteristics of two different wind generators are illustrated.Based on this study,the calculation flow is determined for dealing with the system with wind generation farms.Case studies on the IEEE9-bus system is carried on the simulation platform(DIgSILENT),which proved the power flow characteristics of wind generation system.Thirdly,the transient stability modles of double fed wind power generation and direct-drive wind power generation are established on DIgSILENT,and the corresponding simulations are taken on the IEEE9-bus system.Results on case studies illustrate the dynamic behavior and the influence on the existing systems with integrated wind farms.Finally,on the basis of proposed DFIG,the hybrid wind-photovoiltaic-storage system model is established.Meanwhile,the effects on the hybrid system of different grounded faults are studied.