分析电感电流连续工作模式(continuous conduction mode，CCM)Buck变换器的最优负载瞬态响应过程，通过负载跃变阈值概念的提出，获得负载突变时Buck变换器输出电压的最优超调量(跌落量)和稳态调节时间，仿真分析和实验研究结果表明，Buck变换器在负载跃变时存在最优瞬态工作过程。研究最优负载瞬态特性在滑模控制Buck变换器中的应用，仿真研究结果表明，最优负载瞬态特性的研究对Buck变换器主电路参数和控制策略的设计与实现具有重要的指导意义。

The key to keep the double fluidized bed running steadily for the use of gasifying biomass is to make sure the control of solids circulation rate is appropriate. This paper made a systematic test on the double fluidized bed cold bench. It was mainly about the effect of several factors concerning gas velocity in the bubbling fluidized bed and riser, static bed height and particle size on the solids circulation rate and also established BP neural network with momentum added which gives an efficient simulation in the rate with a forecasting value received. For the purpose of giving a criterion to assess the average diversion of forecasting value from the tested, Mean Diversion Extent was defined. It shows that the diversion of forecasting value from the tested is not more than 0.8 kg×m-2×s-1 with a relative error within ±8%, Mean Diversion Extent no more than 3.56% by means of making a comparison between the forecasting value and the tested. It proves that the BP neural network model has a better forecasting ability.

国家自然科学基金项目(50876030)；高校博士点基金项目(20090036110008)。