基于三相四线制的有源电力滤波器研究
发布时间：2019-02-20 07:59
【摘要】：电能作为现代社会中使用最广泛的能源,其电能质量是衡量一个国家发展水平的重要标志之一。由于电力电子技术的飞速发展,电力电子设备得到了广泛的使用。随着办公的自动化和家用电器的日益普及,三相四线制系统中出现了大量的单相非线性负载,如计算机、打印机、日光灯、变频空调、电梯、电视机、洗衣机、电冰箱等,虽然单台电器产生的谐波不会对电网造成很大影响,但是由于使用的数量极其庞大,并且工作的同时性强,因而会产生大量谐波对电网造成很大的影响。本文针对办公、住宅楼宇这类三相四线制系统的谐波问题,研究了谐波产生的原因、谐波治理的意义、谐波治理的标准、谐波抑制的措施以及有源电力滤波器国内外研究现状和基本工作原理。着重研究了三相四线制系统并联有源电力滤波器的谐波电流检测算法和补偿电流跟踪控制算法两大模块,利用MATLAB软件设计了一个基于新型三相四桥臂逆变拓扑结构的有源电力滤波器模型。该有源电力滤波器模型针对现有的基于线性PI控制器三相锁相环的qpii?谐波电流检测算法在畸变不对称电源电压下检测速度和检测精度的不足,提出了一种基于可变增益非线性PI控制器三相锁相环的谐波电流检测算法。同时,在三相三线制三桥臂有源电力滤波器拓扑结构的二维空间矢量脉宽调制算法和二极管箝位式、飞跃电容箝位式逆变拓扑结构基础上提出了一种基于新型三相四桥臂逆变器的三电平SVPWM控制算法。该算法在计算矢量作用时间时不需要计算正余弦函数,只需解四元一次方程组,控制算法相对简单。且逆变器结构不需要飞跨电容和箝位二极管,随着电平数的增加,结构显得相对简单,可推广应用到大功率的场合。本文详细分析了参考矢量所在的立方体定位以及四面体的判断,同时计算了每个基本空间矢量的作用时间。通过仿真表明,文中所提的谐波检测算法在电源电压畸变情况下具有很好的实用性,能够很好地满足有源电力滤波器谐波检测高精度和实时性的要求。基于新型逆变器的三电平SVPWM控制算法能准确地产生与补偿电流大小相等、方向相反的电流,投入电网中去治理谐波,补偿由于负载的不平衡产生的中线电流,具有较高的补偿精度和较好的动态响应。
[Abstract]:As the most widely used energy in modern society, its power quality is one of the important symbols to measure the development level of a country. With the rapid development of power electronics technology, power electronic equipment has been widely used. With the increasing popularity of office automation and household appliances, a large number of single-phase nonlinear loads appear in three-phase four-wire systems, such as computers, printers, fluorescent lamps, inverter air conditioners, elevators, televisions, washing machines, refrigerators, etc. Although the harmonics generated by a single electrical appliance will not have a great impact on the power grid, because of the extremely large number of using and strong simultaneous operation, a large number of harmonics will have a great impact on the power grid. Aiming at the harmonic problems of three-phase four-wire system such as office and residential buildings, this paper studies the causes of harmonic generation, the significance of harmonic treatment, and the standard of harmonic treatment. The measures of harmonic suppression and the research status and basic working principle of active power filter at home and abroad. Two modules of harmonic current detection algorithm and compensation current tracking control algorithm for shunt active power filter in three-phase four-wire system are studied emphatically. An active power filter model based on a novel three-phase four-arm inverter topology is designed by using MATLAB software. The active power filter model is aimed at the existing qpii? based on linear PI controller three-phase phase-locked loop. The detection speed and accuracy of harmonic current detection algorithm under distorted asymmetric power supply voltage are insufficient. A harmonic current detection algorithm based on variable gain nonlinear PI controller three-phase phase-locked loop is proposed. At the same time, the 2-D space vector pulse width modulation algorithm and diode clamping algorithm for the topology of three-phase three-wire three-arm active power filter are presented. A novel three-level SVPWM control algorithm based on a novel three-phase four-leg inverter is proposed based on the leap capacitance-clamped inverter topology. The algorithm does not need to calculate the sine cosine function when calculating the vector action time, but only needs to solve the quaternion first order equations, and the control algorithm is relatively simple. The structure of the inverter does not need the flying capacitance and clamping diode. With the increase of the level number, the structure is relatively simple, and can be widely used in high-power applications. In this paper, the cube location of reference vector and the judgment of tetrahedron are analyzed in detail, and the action time of each basic space vector is calculated. The simulation results show that the harmonic detection algorithm proposed in this paper has good practicability under the condition of voltage distortion and can meet the requirements of high precision and real time of harmonic detection of active power filter. The three-level SVPWM control algorithm based on the new inverter can accurately generate currents equal to the compensation current in the opposite direction and put into the power network to deal with harmonics and compensate for the neutral-line current caused by the unbalanced load. It has higher compensation precision and better dynamic response.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761;TN713.8
本文编号：2426979
[Abstract]:As the most widely used energy in modern society, its power quality is one of the important symbols to measure the development level of a country. With the rapid development of power electronics technology, power electronic equipment has been widely used. With the increasing popularity of office automation and household appliances, a large number of single-phase nonlinear loads appear in three-phase four-wire systems, such as computers, printers, fluorescent lamps, inverter air conditioners, elevators, televisions, washing machines, refrigerators, etc. Although the harmonics generated by a single electrical appliance will not have a great impact on the power grid, because of the extremely large number of using and strong simultaneous operation, a large number of harmonics will have a great impact on the power grid. Aiming at the harmonic problems of three-phase four-wire system such as office and residential buildings, this paper studies the causes of harmonic generation, the significance of harmonic treatment, and the standard of harmonic treatment. The measures of harmonic suppression and the research status and basic working principle of active power filter at home and abroad. Two modules of harmonic current detection algorithm and compensation current tracking control algorithm for shunt active power filter in three-phase four-wire system are studied emphatically. An active power filter model based on a novel three-phase four-arm inverter topology is designed by using MATLAB software. The active power filter model is aimed at the existing qpii? based on linear PI controller three-phase phase-locked loop. The detection speed and accuracy of harmonic current detection algorithm under distorted asymmetric power supply voltage are insufficient. A harmonic current detection algorithm based on variable gain nonlinear PI controller three-phase phase-locked loop is proposed. At the same time, the 2-D space vector pulse width modulation algorithm and diode clamping algorithm for the topology of three-phase three-wire three-arm active power filter are presented. A novel three-level SVPWM control algorithm based on a novel three-phase four-leg inverter is proposed based on the leap capacitance-clamped inverter topology. The algorithm does not need to calculate the sine cosine function when calculating the vector action time, but only needs to solve the quaternion first order equations, and the control algorithm is relatively simple. The structure of the inverter does not need the flying capacitance and clamping diode. With the increase of the level number, the structure is relatively simple, and can be widely used in high-power applications. In this paper, the cube location of reference vector and the judgment of tetrahedron are analyzed in detail, and the action time of each basic space vector is calculated. The simulation results show that the harmonic detection algorithm proposed in this paper has good practicability under the condition of voltage distortion and can meet the requirements of high precision and real time of harmonic detection of active power filter. The three-level SVPWM control algorithm based on the new inverter can accurately generate currents equal to the compensation current in the opposite direction and put into the power network to deal with harmonics and compensate for the neutral-line current caused by the unbalanced load. It has higher compensation precision and better dynamic response.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761;TN713.8
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