Design Of High-Step-up Power Conversion Converter Topology Based On TRIZ Theory

Power electronic converters are widely studied and utilized for realizing the transformation and utilization of electric energy between different voltage types and voltage levels.It is well known that power converters are very important in many fileds,from the use of household appliances such as mobile phones and televisions,to the grid-side renewable energy grid-connected control and flexible DC transmission technology.There are already many kinds of power conversion topologies proposed,but most of them are designed by the experience or sudden inspiration of designers,which results in the topology design process with the characteristic of contingency.In order to solve above problems,this dissertation aims to conduct the following research.(1)Further extend TRIZ(Theory of the Solution of Inventive Problems)theory to the field of high-step-up power conversion topology design,15 invention principles in 40 invention principles are redefined based on the intrinsic characteristics of power conversion topology design.The detailed construction method and flow of high performance and high-step-up power electronic topology design based on TRIZ theory are derived,it is followed with some technical conflicts and solutions of some existing high-step-up topologies.(2)Adavantages and disadvantages are deeply revealed from the technical conflict of existing Z-source,quasi-Z-source,switched-boost,quasi-switched-boost,quadratic high-step-up DC-DC converter,multi-cell switched-inductor,multi-cell hybrid switch-inductor-capacitor and traditional Z-source half-bridge converter.(3)In terms of the redefined 15 invention principles,technical conflict of 8 circuit structures are deeply demonstrated,then,a series of improved high-step-up topologies are designed.It is then followed with detailed analysis on principle analysis,comparative analysis,simulation and experimental verification.The innovation of this paper is to redefine some of the invention principles in TRIZ theory for the characteristics of high-gain power conversion topology design,so that TRIZ theory can be more suitable for high-step-up power conversion topology design.Several application idea and practical cases of TRIZ theory in high-step-up power conversion topology design provide theoretical and example support for high-performance topology construction;Deeply analyze the existing technical conflict of some high-step-up converters,and provide possibilities for improved topology design;a series of high performance,high-step-up power conversion topologies have been proposed based on the redefined invention principles.The method proposed in this paper effectively reduces the difficulty of power conversion topology design,promotes the systemization of topology design,and with strong practical value.