Abstract:A model for supercapacitor voltage equalization strategy is analyzed, and on this basis a supercapacitor voltage equalization method for Rubber Tyred Gantry Crane (RTG) energy saving system is proposed, namely active voltage equalization method based on Buck-Boost converter. The equalizing speed of the proposed method is fast. Firstly, the working principle and process of the voltage equalization circuit is analyzed in detail. In addition, design of active voltage equalization circuit parameters and control strategy are given. Finally, simulation analysis of the series connection of supercapacitors module is performed. Results show that this method for equalizing voltage can avoid over-voltage of each cell and possess practicable and high value for supercapacitor RTG energy saving system.
In order to solve the problem that the existing Rubber-Tyred Gantry (RTG) Crane consumes massive generating/braking energy through resistance, produces plenty of heat ,causes excessive fuel consumption and exhaust emission during working, the relation of energy flows of the existing system is analyzed and the value of the improvement of energy saving is confirmed in the paper. Firstly, the constitution and principle of the RTG energy saving system are proposed. In addition, the topology and principle of the bi-directional DC/DC converter are anatomized. Thirdly, after analyzing a model for supercapacitor voltage equalization strategy, a voltage equalization method for RTG energy saving system is proposed, namely active voltage equalization method, and design of active voltage equalization circuit parameters and control strategy are given. Finally, simulation analysis of the series connection of supercapacitors module is performed.
Keywords-Rubber Tyred Gantry Crane(RTG); supercapacitor; energy saving; bi-directional DC/DC converter; design of active equalization circuitI.
A bidirectional converter for electromechanical brake/the recycling of power generation energy is proposed in this paper. The gain of the converter is high. Since the converter use the technique of passive lossless buffer and synchronous rectification, the main switches achieve the technique of soft switching. Meanwhile the conversation efficiency is high too. Some experimental results and analysis of theory are given to verify the effectiveness of the proposed bidirectional converter.
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