The Research On Control Strategy Used In Boost Converter And Its Parallel Configuration

In recent twenty years,the research on the operation and application of power converters has become one of the hot issuses with the rapid development of electronics.Boost not only gains extensive independent application,but also composes a variety of high-performance converters.The paper focused on the parallel configuration and control strategy of boost which is valuable from the view of practical point in expanding its performance,capacity and utilized scope.In this paper,a symmetrical parallel boost configuration appropriate for wind power generation is designed by comparing several parallel topologies.The theoretical analysis of working mode was carried out based on its mathematical model.By superiority investigating and parameters' design,the digital control scheme combining interleaving technique with double closed-loop controller was given.The design of hardware circuit was introduced based on C8051F series single-chip microprocessor including control unit,detection and protection unit as well as keyboard and display unit.Furthermore,the software design and program flow charts ware given.The direct digital control system of PI voltage controller was presented from the dynamic control models which can achieve stable voltage adjustment.In the meantime,the current loop controlled inductor current following input voltage with Small Inertia Current Tracking method which can reduced aberrance and improved power factor.The interleaving technique was applied in the parralell boost,which can effectively alleviate the ripple current and reduces switching stress,equivalently increase frequency.Consequently,the power level of system and efficiency can be greatly improved.The PSPICE simulation and experiment research results indicate feasibility and validity of the configuration and control scheme.