【作者】 杜文雄；

【导师】 王钦若；

【作者基本信息】 广东工业大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 随着我国经济的快速发展,工农业用电需求急剧增加。作为移动电源和备用电源的发电机,其市场需求也随之日益增大。汽油发电机组的最新发展趋势是汽油发电机组和电力电子变换器的结合以及电子调速器的使用,也就是将发电机输出的原始电压经过电力电子变换器处理,然后再输出给负载,电子调速器调节发动机转速,以达到节能的目的。为适应市场的需要,开发一种输出稳定、可靠性高、成本低的小型汽油发电机组具有较大的实用价值。本课题研究和设计2.5KVA小型汽油发电机变频电源控制器。该变频电源控制器的功率变换电路采用交一直一交的变换模式,输出为单相220V/50Hz的交流电。本文首先介绍了汽油发电机组的基本原理及其运行特性,在此基础上,以单片机控制为核心,详细阐述了变频电源系统的结构组成及其控制实现原理。对功率变换电路作了详细的分析与设计,包括整流电路,降压电路,逆变电路和辅助电源电路的设计,并给出了各组成电路元器件选型的具体依据。针对BUCK降压电路的控制,采用脉宽调制集成芯片和PI调节构成的电压模式闭环控制,实现直流母线电压的稳定调节。而逆变器的控制则在建立其线性化模型的基础上,引入双闭环比例控制,很好地解决了系统输出稳态误差过大的问题。但由于双闭环比例控制仍存在输出失真的问题,作为改进控制,引入重复控制策略来提高系统的动态响应能力和稳定性,以提高逆变器的负载适应性。在变频电源功率变换电路设计的基础上,设计了汽油机转速控制系统。针对汽油机工作过程中具有明显的时变性,非线性和不确定性,采用PID与模糊控制相结合的策略,设计出转速控制器,使发动机的转速能够迅速平稳地跟踪负载的变化,从而更好地提高输出电源的品质。更多还原

【Abstract】 The new style gasoline engine generator combined with power electronic converter and electronic speed controller, have shown its superiority in good output quality and low oil consumption. In order to suit the market requirement, it is valuable to develop small gasoline engine generator with good output quality.The aim of this thesis is to develop the 2.5KVA variable-frequency power sources controller. It consists of two parts: one is power electronic inverter; the other is speed control of gasoline engine. According to gasoline engine generator output characteristic, this thesis chooses the AC-DC-AC topological structure. This thesis analysis the constituent part of circuit and at the same time make the component selected. In the design of control circuit, the BUCK circuit selects voltage closed-loop mode. Its controller composes with pulse width modulator and adopts PI modulation as regulative technology. Base on the establishing of SPWM inverter model, selective analysis inverter controller’s control policy. In this design use the double closed-loop proportion control in order to reduce steady state error. Repeatedly control is used to improve dynamic response and stable characteristic. The result of simulation and actual show that this control policy of inverter is effective.According to the gasoline generator’s feature, this thesis use PID and fuzzy control as the speed control system’s theory .更多还原