【作者】 李康；

【导师】 陈夕松； 王晓俊；

【作者基本信息】 东南大学 ， 检测技术与自动化装置， 2020， 硕士

【摘要】 精密高压数字交流电源对电气设备材料绝缘性分析非常重要,基于交流电压的绝缘性测试可以准确地获取绝缘材料的绝缘耐压特性,发现其内部绝缘缺陷。目前大多数用于电气设备材料绝缘性分析的交流电源频率都是定频或窄频带可调,且输出电压精度也不高。本学位论文旨在研究并设计一套精密数字交流电源系统,其输出频率在50Hz-400Hz范围内可调,输出电压在10V-5000V范围内可调,输出电压具有高精度和低失真度。本文第一章介绍了精密数字交流电源系统的研究背景和意义,阐述了精密数字交流电源的国内外发展现状,明确了本课题的研究难点和重点。第二章设计了精密数字交流电源系统的总体方案,结合系统设计目标对本课题涉及的关键技术进行阐述,包括高质量可调直流母线电源设计、LC滤波器设计和闭环控制算法,并对系统的软硬件方案和控制方案进行了详细介绍。第三章首先确定了系统主控器电路设计,保证系统稳定运行;然后基于PFC和反激变换器完成了直流母线电源模块电路设计,为逆变桥提供高质量可调母线电压;最后对系统逆变模块电路进行了分析和设计,包括逆变桥及其驱动电路设计、多档位LC滤波器电路设计和电压电流反馈电路设计。第四章建立了系统的数学模型,基于系统数学模型进行控制方案的研究与设计,分别设计了双闭环PI控制、重复控制和复合控制三种控制方案,并利用Simulink仿真平台进行仿真验证,结合理论分析与仿真结果最终选择复合控制作为系统闭环控制算法。第五章在DSP内采用分层模块化技术设计了精密数字交流电源系统嵌入式软件,软件设计内容包括SPWM算法实现、数字滤波器与FFT设计、相关参数指标计算、系统主控逻辑设计与系统控制算法的实现等。最后,本文完成了精密数字交流电源系统的功能调试和性能测试工作。测试结果表明,系统满足设计要求,达到预期效果。对调试过程中遇到的问题进行了分析并提出解决方案,并对课题进行了总结和展望。更多还原

【Abstract】 Precision high voltage digital AC power supply is very important for the insulation analysis of electrical equipment materials.The insulation test based on AC voltage can accurately obtain the insulation voltage characteristics of insulation materials and find their internal insulation defects.At present,most of the AC power supplies used for insulation analysis of electrical equipment materials are fixed-frequency or narrow-band adjustable,and the precision of output voltage is not high.This thesis aims to study and design a set of precise digital AC power supply system,whose output frequency is adjustable in the range of50Hz-400 Hz and output voltage is adjustable in the range of 10V-5000 V.The output voltage is of high precision and low distortion.This thesis’ first chapter introduces the research background and significance of precision digital AC power supply system,expounds the development status of precision digital AC power supply at home and abroad,and makes clear the research difficulties and key points of this topic.The second chapter designs the overall scheme of the precision digital AC power supply system,and describes the key technologies involved in this topic according to the system design goal,including the design of high-quality adjustable DC bus power supply,LC filter design and closed-loop control algorithm,and makes the detailed introduction to the software and hardware scheme and control scheme of the system.The third chapter firstly determines the circuit design of the main controller of the system to ensure the stable operation of the system;And then completes the circuit design of the DC bus power supply module based on PFC and flyback converter to provide high-quality adjustable bus voltage for the inverter bridge;Finally,it analyzes and designs the system’s inverter module circuit,including the inverter bridge and its drive circuit design,multi-grade LC filter circuit design,and voltage and current feedback circuit design.The forth chapter establishes the mathematical model of the system,and studies and designs the control scheme based on the mathematical model of the system.It respectively designs three control schemes of double closed-loop PI control,repetitive control and compound control,and carries out the simulation verification by using Simulink simulation platform.It finally selects compound control as the closed-loop control algorithm of the system according to theoretical analysis and simulation results.The fifth chapter designs the embedded software of precision digital AC power supply system by using hierarchical and modular technology in DSP.The software design includes the realization of SPWM algorithm,the design of digital filter and FFT,the calculation of related parameters,the design of system main control logic and the realization of system control algorithm.Finally,this thesis completes the function debugging and performance testing of the precision digital AC power system.The test result shows that the system meets the design requirements and achieves the expected results.It analyzes the problems encountered in the debugging process and puts forward the solutions,summarizes and makes a prospect of the topic.更多还原