三相四线制有源滤波器直流侧电压控制研究

发布时间：2018-05-27 05:35

本文选题：三相四线制 + 有源电力滤波器　；参考：《安徽大学》2014年硕士论文

【摘要】：随着电力电子技术的飞速发展,越来越多的非线性电力电子装置被广泛使用于各类场合。这些非线性电力电子装置使得电力系统的电能质量问题变得越来越严重,由其产生的谐波、无功功率对电力系统造成了严重的危害。三相四线制并联型有源电力滤波器是一种高效、稳定、灵活的改善电能质量的重要装置,是目前治理电网污染,提高电网效率,确保电网和用电设备安全的最理想的设备,营造了一个“绿色”的用电环境。本论文针对三相四线制并联型有源电力滤波器的关键技术展开了研究。 1.提出一种基于四阶累积量的TAM电力系统谐波检测方法。该方法以信号空间为模型,首先用盖氏圆检测出信号源数,然后利用四阶累积量定义的矩阵代替传统二阶多信号分类法中的自相关矩阵做特征分解,将特征值对应的特征向量分为信号子空间和噪声子空间,再结合信号子空间和噪声子空间的正交性以及子空间的旋转不变性,估计出信号的频率。最后采用总体最小二乘法(TLS)计算得到信号的幅值。仿真和试验验证了所提方法的合理性及可行性,为电力系统谐波的分析和治理提供了一种新的工具； 2.针对低压配电系统三相四桥臂并联型有源滤波器直流侧电压PI控制存在超调比较大、动态响应速度慢等缺点,设计了一种采用模糊控制与PI控制相结合的模糊PI复合控制器。该控制器将输入变量进行模糊化,通过模糊推理控制模糊输出变量,以此实现在线修改参数的目的。该控制器经MATLAB仿真实验分析表明,该方法超调小、动态响应速度快,能满足负载突变工况的要求,验证了所设计的模糊PI控制器的有效性和优越性。
[Abstract]:With the rapid development of electric and electronic technology, more and more nonlinear power electronic devices are widely used in various occasions. These nonlinear power electronic devices make the power quality problem of power system become more and more serious. The harmonic and reactive power produced by them have caused serious harm to the electric power system. Three phase four wire system is used. The combined active power filter is an important device which is efficient, stable and flexible to improve the power quality. It is the most ideal equipment to control the pollution of the power grid, improve the efficiency of the power grid and ensure the safety of the power grid and the electrical equipment, and create a "green" power environment. This paper aims at the three-phase four wire shunt active power filter. The key technology has been studied.
1. a harmonic detection method for TAM power system based on the four order cumulant is proposed. The method uses the signal space as the model. First, the number of signal sources is detected by the gage circle. Then the matrix of the four order cumulant is used to replace the autocorrelation matrix in the traditional two order multi signal classification method, and the eigenvectors corresponding to the eigenvalues are divided. For the signal subspace and noise subspace, the frequency of the signal is estimated by combining the orthogonality of the signal subspace and the noise subspace and the rotation invariance of the subspace. Finally, the amplitude of the signal is calculated by the total least square method (TLS). The rationality and feasibility of the proposed method are verified by simulation and test, which is the harmonic of the power system. It provides a new tool for the analysis and management.
2. in view of the disadvantages of large overshoot and slow dynamic response speed in the DC side voltage PI control of three-phase four bridge arm shunt active filter in low voltage distribution system, a fuzzy PI composite controller which combines fuzzy control with PI control is designed. The controller uses the input variable into the line to paste the mode, and controls the fuzzy transmission by fuzzy reasoning. According to the MATLAB simulation experiment, the controller shows that the method has small overshoot and fast dynamic response speed, which can meet the requirements of the load abrupt condition, and verifies the effectiveness and superiority of the designed fuzzy PI controller.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761.12;TN713.8

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