Study On The Control Strategy Of Brushless Electricity Exciting Synchronous Generator And Wind Energy Efficiency

With the traditional energy reserves decline, market prices increasingly rise,and the ecological environments continue to worsen, it is a new task trying topromote real green and renewable energy. While the rapid development of theworld wind power industry and the grid capacity, to research the wind powersystem which is the independent intellectual property right has a profoundaffection for improve market competitiveness and develop national economy,But the domestic existing large wind generator is not mature, the lacking of coretechnology and emerging various kinds of questions and fault, in recent years theaccident of large wind generator to take off the nets is generally a blowout. Tosolve the deficiency of existing wind power control device, several new andoptimized types of excitation control strategies based on the electric excitationsynchronous brushless generator are brought forward, to realize the maximumuse of wind power.Excitation system for improving the stability and efficiency of synchronousgenerator system is always the concern of topics and direction. Using thebrushless exciting synchronous generators in wind power, referencing themaximum use of wind power, and combining with the characteristics of windsystem, the excellent excitation control strategy not only can enhance thereliability of the unit, further more can effectively improve the technical index.Firstly, the basic theory, structure and the work characteristics of windpower generation unit are introduced in this paper. The basic principle, type,mathematical equation and model, vector gram and equivalent circuit ofsynchronous generator are analyzed. The similarities and differences ofsynchronous generator are compared as running separately, grid connected or inthe wind power system.Secondly, the impact of synchronous generator excitation for voltage of the machine, power and stable operation are analyzed in the paper. The excitationcontrol system from structure, control requirements and control principle aresummarized and researched. Further more, the brushless excitation technologyand brushless excitation control system based on the existing application ofsynchronous generator excitation system are researched.Brushless electricity excitation technology is perfected and innovativegradually, based on the traditional brush excitation system of synchronousgenerator, combining the power electronic technology, microelectronicstechnology, automatic control technology. It includes rotating rectifier, lordexciter, vice exciter and control unit, its characteristic is no sliding contact part,simple maintenance, high reliability, long run and durable, especially suitable forno one management or management difficult situation or bad environmentalconditions. This paper studies the control strategy of brushless electricityexcitation system, from the control model, control algorithm, the control model,and puts forward two realizations with digital control unit at last.Finally, through building the grid connected brushless excitationsynchronous wind power experimental system, to prove the feasibility andcorrectness and advantages of the exciting control strategies applying in windpower generation system, and to verify that it can track the ideal power curveand realize the maximum use of wind power. Excitation system for improvingthe role of power system stability is always the concern of topics and direction.Excellent excitation control system can not only ensure generator and reliableoperation, providing qualified electrical energy, but also can effectively improvethe technical index system, ensure the grid voltage level in a certain range.Because of the importance of excitation system operation, require all thegenerator will furnish excitation controller.