Research On Input-series Output-paralleled Multi-modules Converter

Along with energy crisis and the development of power electronics and controlled technology,Including the wind power., the renewable energy has become a better choice for human. Fornon-grid-connection wind power, high input voltage DC-DC converter is one of main technologies tothe realization of wind power system. And power electronics system integration has become a kind oftrend of Power Electronics. Multi-modules input-series converter is very suitable for high inputvoltage and high power DC/DC conversion applications. To realize reliable working of this converter,input voltage sharing among the modules should be ensured.The development of the non-grid-connection wind power and the power power electronicssystem integration are firstly introduced in this paper. Then the advantages of the input-seriesoutput-paralleled (ISOP) converter is analysed among several kinds of DC-DC convertors using inhigh input voltage applications. Based on that, this paper adopts the common-duty-ratio controlstrategy of input-series output-parallel DC–DC converter modules. Based on above analysis, withphase-shift full-bridge convertor as a basic module, the principle of phase-shift full-bridge convertoris studied as well. The small-signal model of the ISOP converter is derived. It is verified bymathematical method that the system is feasible. The question of input voltage sharing and outputcurrent sharing of PSFB-ISOP converter was analyzed both in steady-state and dynamic-state. Andthe impact of some parameters of this converter to the input voltage sharing is also analyzed.A ISOP prototype consisting of three full-bridge DC-DC modules is built in lab. Simulation andExperimental results are given to verify the effectiveness of the propose control strategy.