三相四线制三电平结构有源电力滤波器检测与控制策略研究

发布时间：2018-04-21 04:04

本文选题：三相四线制 + 三电平　；参考：《河北工业大学》2015年硕士论文

【摘要】：谐波是非线性负荷接入电网造成的,是一直困扰电能质量的大问题,为了保障电力系统安全稳定、优质运行,必须彻底消除电网中的这一“毒瘤”,实现绿色用电,和谐电网的目标要求。有源电力滤波器作为一种有效的谐波补偿装置,对其研究具有重要意义和必要性。基于此,本文以三相四线制三电平并联型有源电力滤波器为研究对象,对谐波检测、补偿控制技术和装置的设计进行了系统深入地研究。针对目前有源电力滤波器中的谐波检测算法,深入研究了基于希尔伯特黄变换(HHT)的谐波检测方法,在此基础上,提出了基于总体平均经验模态分解(EEMD)的HHT检测算法。经仿真验证,EEMD方法在分解过程中不会出现模态混叠现象,克服了基于经验模态分解方法(EMD)的不足。EEMD方法与瞬时无功qpii?方法相比,在负载突变时算法的自适应能力强、检测精度高、实时性好。补偿控制方法采用了简化的三电平空间电压矢量调制算法,并引入PI+重复的电流跟踪控制策略;阐述了直流侧电压控制方法、提出了电容中点电压偏移的解决方案。设计搭建了仿真模型,仿真结果表明在三相对称、不对称的情况下均能达到满意的补偿效果,换相点处补偿不足的问题得到明显改善,很好地实现了三相四线制三电平有源电力滤波器的补偿控制。以TMS320F28335芯片为主控单元,设计了三电平有源电力滤波器装置,编写了DSP软件程序并设计了相应的外围电路,经带负载测试,该样机能实现对谐波电流的有效补偿。
[Abstract]:Harmonic is caused by the nonlinear load connecting to the power network, and it is a big problem that has been puzzling the power quality. In order to ensure the safety and stability of the power system and the high quality operation, it is necessary to completely eliminate the "cancer" in the power network and realize the green electricity consumption. Objective requirements of harmonious power grid. As an effective harmonic compensation device, active power filter (APF) is of great significance and necessity to its research. Based on this, the three-phase four-wire three-level shunt active power filter is taken as the research object, and the design of harmonic detection, compensation control technology and device is studied systematically and deeply. Aiming at the harmonic detection algorithm of active power filter, the harmonic detection method based on Hilbert-Huang transform (HHT) is studied in detail. Based on this, an HHT detection algorithm based on the population average empirical mode decomposition (EMD) is proposed. The simulation results show that there will not be modal aliasing in the decomposition process of the EEMD method, which overcomes the shortcomings of the empirical mode decomposition (EMD) method and instantaneous reactive power qpii? Compared with the method, the algorithm has strong adaptive ability, high detection accuracy and good real-time performance when the load changes. The compensation control method adopts the simplified three-level space voltage vector modulation algorithm, and introduces Pi repetitive current tracking control strategy, describes the DC side voltage control method, and puts forward the solution of capacitance neutral point voltage deviation. The simulation model is designed and built. The simulation results show that the compensation effect is satisfactory in the case of three-phase symmetry and asymmetry, and the problem of insufficient compensation at the commutation point is obviously improved. The compensation control of three-phase four-wire three-level active power filter is well realized. The three-level active power filter device is designed with TMS320F28335 chip as the main control unit. The DSP software program is written and the corresponding peripheral circuit is designed. Through the load test, the prototype can effectively compensate the harmonic current.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713.8;TM761

【参考文献】