A Control Strategy For Practical Stability Of The Power Electronic Converter With DC Sources

In the past decades,power electronic technology has contributed to dragging the motor and fabricating energy conversion system.It has also widely used in the field of distributed power generation technology which makes it have a vigorous development.Power converter as an important part of power electronic technology,the controllable stability requirements has become one of the most important development direction of power electronic technology and has huge influences on meeting daily industrial manufacturing.Nowadays,rapid development of power electronic technology has promoted researches on electronic control and stability of the power unit advancing at high speed.Inverter circuits and chopper circuits based on state space average model and strategy have been used extensively in most control system.Due to convenience to calculate average model,it has also been widely used in the production.However,as more and more high requirements for power electronic devices appeared,traditional state space average model need to be abandoned in model power electronics device,and then analyzing the process of the switch and making deeper researches on the stability.This research aims at two characteristics of power electronic converter device which consist of finite input set and constant switch rate,including the analysis of the existing system under the control of a Practical Stability and starting from the Practical Stability to get new control law.This thesis proposes a new method used in sorts of power electronic converter device which has advantages in solving practical stability problems of converters.Meanwhile,this thesis researches on practical stability control method for the finite input set and constant control period and the relations between control period and tracking error limits,giving method to improve tracking effect and promoting the development of converter’s precise tracking.According to these,this thesis lists the main work as follows:1.Transferring input problems of converters to stability problems in constant control period;2.According to practical stability theory,Some conclusions about practical stability in DC-DC Buck circuit,DC-DC Boost circuit,single phase inverter circuit had been researched by simulations and experiments;3.Researching on relationships between the frequency and practical stability control error,and finally researching on the practical stability control method in three-phase inverter circuit by simulations.