【作者】 赵伟；

【导师】 田铭兴；

【作者基本信息】 兰州交通大学 ， 电工理论与新技术， 2012， 硕士

【摘要】 电气化铁道牵引供电系统所引起的电能质量恶化及对电力系统的危害已受到广泛关注。研究能更好治理由电气化铁道牵引供电系统引起的电能质量问题的技术和装备已成为现阶段专家和学者研究的重要课题。论文针对电气化铁道牵引供电系统中的谐波及无功问题,较为全面地考察了现有无功和谐波治理领域的检测及控制方法,在此基础上研究电气化铁道有源综合补偿装置的检测方法及控制方法。首先分析和仿真了目前常用的两种单相电路谐波及无功电流检测方法。基于鉴相原理的检测法虽然可以快速检测但存在锁相环的设计,而近年学者提出的单相电路无锁相环检测法规避了锁相环的设计但运算量较大。故论文将三相电路中的同步检测法原理应用在单相系统中,并对该方法建模仿真,证明了该方法检测谐波及无功的准确性,另外该方法在电压畸变的情况下仍能准确检测,且运算小、实时性好。分析了综合补偿装置中的控制方法,包含直流侧电压控制和变流器输出电流跟踪控制。直流侧电压的控制利用有功功率守恒的方式控制,避免了传统PI控制中的参数计算环节。变流器的控制方法主要研究了双极性滞环控制、单极性滞环控制及优化的单极性控制的工作原理,对双极性滞环控制和优化单极性滞环控制的开关频率做了分析,在此基础上做了实验研究,实验结果体现了优化单极性滞环控制的优越性。在前面分析和研究基础上,建立了系统硬件实验平台,设计了控制主板,论文介绍了实验系统的硬件设计及软件设计方案,并针对实际应用问题,提出了一种软启动方案。实验结果证明了论文所研究的检测方法、控制方法、硬件及软件方案的正确性和可行性。更多还原

【Abstract】 Power quality deterioration and damage to the power system caused by ecectrified railway traction power supply system has been paid extensive attention, researching on technology and equipment for better control of the problem of power quality, which is caused by electrified railway traction power supply system, has become important issues for experts and scholars at this stage.Aiming at the problem of the harmonic and reactive power in electrified railway traction power supply system, the thesis analyzes present detection and control method of the harmonic and reactive power, according to the results, thesis studies the method of control and detedtion for the active comprehensive compensation device in electrified railway.First, the thesis analyzes two common-used single-phase circuit harmonics and reactive power detection, the method based on the phase distinguishing technology can rapidly detect but it have to design phase-locked loop, while in recent years scholars have proposed single-phase circuit without phase-locked loop method of detection but has a bigger computation. So thesis applies the principle of synchronous detection method from three-phase circuit to single-phase system, simulation shows the accuracy of the method in detecting the harmonic and reactive power, it can detect exactly and has small computation and good real-time in the case of voltage distortion.Then the thesis analyzes the method of comprehensive compensation device control, including current tracking control and DC voltage. The control of the DC voltage uses the active power conservation pattern to avoid obtaining parameters of Proportion Integration(PI) control. Research on the control of the converter including unipolar and bipolar hysteresis loop control control, analyzes the switch frequency of bipolar hysteresis loop control and optimized unipolar hysteresis loop control. The experimental results demonstrates the superiority of optimized unipolar hysteresis loop control.According to the analysis and research in the first few chapters, a hardware experimental platform of comprehensive compensation system was established, and the design of the control board was finished, at the same time, the design scheme of software and hardware was given, and a soft-start scheme for practical applications has been proposed.Experimental results show the correctness and feasibility of the detection and control methods, hardware and software solutions in this thesis.更多还原