Simultaneous-supplying Or Time-sharing Full-bridge Boost Double-input DC-DC Converter Mode Distributed Generation System

Single power supply from renewable powers such as photovoltaic,wind and so on has disadvantages on reliability such as instability,discontinuity because the output powers change with climate conditions,which suppresses the exploitation of renewable powers seriously.For improving the power system stability and continuity,and realizing the full use and management of renewable powers,renewable distributed generation system with two or more sources becomes an important strategy for renewable energy power generation technology.Based on introduction of development and status of traditional single-input converters mode and time-sharing-supplying,simultaneous-supplying,multi-winding time-sharing-supplying,multi-winding simultaneous-supplying multiple-input converters mode distributed generation system that consists of the voltage pulse input source or current pulse input source with two or more sources,simultaneous-supplying or time-sharing full-bridge Boost double-input DC-DC converter mode distributed generation system circuit topology and energy management control strategy is proposed in this paper.By the theory analysis,simulation and experiment research of the circuit topology and energy management control strategy,conclusions about the characteristic of steady principle,design criterion of key circuit parameters and so on,are got.Simultaneous-supplying or time-sharing full-bridge Boost double-input DC-DC converter mode distributed generation system circuit topology consists of three-winding isolated full-bridge Boost mode double-input DC/DC converter with bypass switch and power frequency polarity reversal bridge,which has advantages such as high frequency electrical isolation between input sources and between output and input sources,strong voltage matching capability and anti-electromagnetic interference ability,time-sharing or simultaneous power supply from multiple input sources,wide regulating range of duty cycle and so on,and is suitable for generation system with two or more distinct sources.Realize the maximum power output energy management by the dual-mode maximum power point tracking control and PV array output voltage loop.Reduce the energy storage inductor value,suppress the increase of current and ensure the feasibility of one-cycle control strategy by the control of limited energy storage inductors current.Improve output current waveform quality and the response performance of the system by the combination of one-cycle control and PI control.The characteristics of steady principle including three working modes and six switching states in power frequency period and three working processes of the switches in high-frequency period are studied,getting the system state space equation.Analyzed limited value of energy storage inductance current and the increase of current,the design criteria of the passive components parameters of the novel distributed generation system such as high frequency transformer turns ratio,energy storage inductor,active clamping capacitance and output CCRL filter are derived,and the voltage and current stress of the active components are got.The PSIM simulation and prototype experiment of 3kVA 200-260VDC/220V50HzAC simultaneous-supplying or time-sharing full-bridge Boost double-input DC-DC converter mode distributed generation system verify the correctness of its theoretical analysis and the reliability of its actual use.