【作者】 俞杨威；

【导师】 吕征宇；

【作者基本信息】 浙江大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 本文针对汽油机拖动永磁发电机的中小功率独立发电系统，设计一套逆变电源，将发电机发出的中频交流电变换为负载所需要的工频交流电，系统中所有控制都由TI公司的TMS320LF2407A DSP(数字信号处理器)芯片完成，DSP全数字控制降低了硬件电路复杂性，提高了系统的可靠性。文中介绍了系统的硬件电路和软件系统的设计过程，并对设计的逆变电源进行了实验，给出了试验结果。移动式发电机用逆变电源系统主要包括整流、油门控制和逆变三大部分。为了控制直流侧电压，同时节省成本，前级整流采用晶闸管半控整流方案，用DSP芯片实现对三个共阴极晶闸管的全数字触发，从而对直流侧电压进行闭环控制。为了使发电机的转速跟负载功率能够良好匹配，对汽油机的油门调节进行控制，本文采用发电机负载功率变化的前馈控制和转速的分段反馈比例控制相结合的方式，使发电机的转速在负载突变时的波动能够控制在一定的范围之内。研究了逆变器的数字控制方式，逆变器采用电感电流和输出电压的瞬时值双环控制，在分析逆变器模型的基础上，通过在Matlab/Simulink中的仿真对系统进行稳定性分析，确定补偿环节的参数。讨论了数字控制的采样计算延时对逆变器系统稳定性的影响，引入状态预报观测器进行超前一拍的补偿，提高了系统的稳定性。最后按照本文的设计方案，研制了一台6kVA的逆变器样机，并对样机进行了实验分析，得到了较理想的波形，满足设计任务指标，验证了设计方案的正确性和可行性。更多还原

【Abstract】 This paper designs a set of inverting power supply for medium and small independent electricity -generating system, which including permanent magnetism dynamo pulled by a gasoline engine. It converts the medium frequency electricity generated by the dynamo into the electricity which can be used by the normal loads directly. This inverter system is fully controlled by the TMS320LF2407A DSP(digital signal processor)of TI corporation, which makes the system be more stable and the hardware circuits simpler. The paper introduces the design process of the hardware and software, and the experimental results are tested according to the design methods.The inverter system of the portable generator contains three main parts: the rectifier, the gun controller of the gasoline engine and the inverter. The thyristor half-control rectifier is adopted in this system so that the DC voltage can be controlled and the cost be reduced as well. The DC voltage close loop control is accomplished by means of the fully digital trigger signals generated by DSP to the three thyristors with common cathodes. The working conditions of the dynamo should match the change of the load, which can only be achieved by means of controlling the gun of the gasoline engine. The forward of the power variation and the subsection proportional feedback of the rotate speed control are adopted in this system to reduce the rotate speed fluctuation of the dynamo to some extent when the load is switched suddenly.The double loop of the current of inductance and the output voltage control scheme is adopted in the system of inverter control. The parameters of the compensating tache are identified by the Matlab/Simulink simulation based on the analysis of the maths model of the inverter. This paper discusses the negative impact on the system stable caused by the sampling and calculation delay of the digital control. The state observer predictive control is introduced to accomplish one-step exceed compensation, which can enhance the stability of the inverter system.At last, a 6kVA inverting power supply sample is manufactured according to the design scheme discussed in this paper. The experimental waveforms are quite good, which satisfies the design indexes completely. The design methods are validated by means of analyzing the experimental results.更多还原