Research On Staggered Parallel Boost Converters With Pseudo-continuous Conduction Mode

Solar energy,as a ubiquitous green energy source with wide application prospects,has the advantages of short regeneration cycle and abundant reserves.In photovoltaic grid-connected applications,because the output DC voltage of the photovoltaic array is low,a Boost converter must be used to boost the DC voltage.However,the traditional Boost converter has the disadvantages of slow response speed,low voltage gain,large current ripple,high voltage stress of the switch tube,and small load range.For the traditional Boost converter,there are problems such as large output ripple and slow response speed.This subject is based on the dynamic reference current(Dynamic Reference Current,DRC)control strategy,and conducts in-depth research on Boost converters used in photovoltaic power generation systems.In view of the existing problems,in order to improve the dynamic response capability of the Boost converter,the Pseudo Continuous Conduction Mode(PCCM)is used;in order to reduce the input current ripple of the Boost converter,the interleaved parallel control method is used;To improve the conversion efficiency of Boost converter,DRC control strategy is adopted to optimize the control method.The comprehensive application of the above methods improves the overall performance of the photovoltaic boost converter as a whole.This subject has designed a two-phase six-state PCCM staggered parallel Boost converter for photovoltaic power generation system.It has a wide voltage input of30-60 VDC and an output of 380 V / 2.1A.It analyzes its basic working principle,control strategy and performance.In MTALAB software,the control loop compensation design is performed for the discrete system,and the circuit is simulated in simulink software to verify the feasibility of the designed circuit.