模块化三相四线制并联型有源电力滤波器数字控制及实现

发布时间：2018-01-07 11:07

本文关键词：模块化三相四线制并联型有源电力滤波器数字控制及实现　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：电力电子技术的日益发展成熟和电力自动化设备的广泛应用在推进工业生产力发展和电气自动化水平提高的同时,也引起了严重的电网谐波污染问题。有源电力滤波器(Active Power Filter, APF)作为谐波、无功动态补偿装置,可以有效的解决公用电网的谐波污染问题。本文以直流侧电容分裂式三相四线制并联型有源电力滤波器为载体,重点研究了选择性谐波电流检测算法及限流控制策略、补偿电流数字控制策略以及多模块并联组合系统的控制与实现等问题。本文从探寻适用于工业场合的选择性谐波电流检测算法角度出发,对目前在APF中应用较多的基于同步旋转坐标变换、基于数字带通滤波器以及基于离散傅里叶变换(Discrete Fourier Transform, DFT)的选择性谐波电流检测算法进行了研究和分析。提出了一种基于DFT的优化选择性谐波电流检测算法的程序实现方法,在保证高稳态检测精度的同时,大大减少了对程序空间的占用。对APF的过流原因和情况进行了分析,提出了一种基于优化DFT算法的限流控制策略,保证了APF的限容运行。仿真和实验结果验证了所提出的选择性谐波电流检测算法和限流控制策略的正确性和有效性。指令电流的跟踪精度取决于控制策略的选择和控制器的参数设计。本文以提高系统谐波补偿精度、改善动态性能和适应复杂工况为出发点,引入了基于ABC坐标系的控制策略,在时域下完成对直流侧电压和补偿电流的闭环控制。详细设计了以PI控制器和重复控制器组成的电流内环,以稳压环和均压环组成的电压外环的双环控制器,极大的改善了谐波稳态补偿精度和动态响应速度。各类工况下的实验结果验证了控制策略的可行性和有效性。为了适用于大容量谐波负载的工况场合,对APF多模块并联组合系统进行了研究。给出了多模块并联组合系统的结构,并阐述了其基本工作原理。对组合系统的负载电流采样方法和均流控制策略进行了研究。对组合系统的控制系统进行了详细设计,并阐述了其功能的数字实现方法。最后通过仿真和实验验证了组合系统的正确性和可实现性。
[Abstract]:With the development of power electronics technology and the wide application of power automation equipment, the development of industrial productivity and the improvement of electrical automation level are being promoted at the same time. Active Power filter (APFF) is used as harmonic and reactive power dynamic compensation device. It can effectively solve the problem of harmonic pollution in public power network. This paper takes the DC side capacitor split three-phase four-wire shunt active power filter as the carrier. The selective harmonic current detection algorithm and current limiting control strategy, the digital control strategy of compensation current and the control and implementation of multi-module parallel combined system are studied. In this paper, from the point of seeking selective harmonic current detection algorithm suitable for industrial applications, this paper focuses on the synchronous rotation coordinate transformation which is widely used in APF at present. Based on digital bandpass filter and discrete Fourier Transform. The selective harmonic current detection algorithm based on DFT is studied and analyzed, and a program implementation method of optimized selective harmonic current detection algorithm based on DFT is proposed. At the same time, the high accuracy of steady-state detection is guaranteed, and the occupation of program space is greatly reduced. The cause and situation of overcurrent in APF are analyzed, and a current limiting control strategy based on optimized DFT algorithm is proposed. The simulation and experimental results show that the proposed selective harmonic current detection algorithm and current limiting control strategy are correct and effective. The tracking accuracy of instruction current depends on the choice of control strategy and the design of controller parameters. This paper starts with improving the accuracy of harmonic compensation, improving dynamic performance and adapting to complex working conditions. The control strategy based on ABC coordinate system is introduced to complete the closed-loop control of DC side voltage and compensation current in time domain. The current inner loop composed of Pi controller and repetitive controller is designed in detail. A double loop controller of a voltage outer loop composed of a voltage stabilizing ring and a voltage equalizing ring. The accuracy of harmonic steady-state compensation and the dynamic response speed are greatly improved. The experimental results under various operating conditions verify the feasibility and effectiveness of the control strategy. In order to be suitable for large capacity harmonic load, the APF multi-module parallel combined system is studied, and the structure of the multi-module parallel combined system is given. The basic working principle of the system is described. The load current sampling method and current sharing control strategy of the combined system are studied. The control system of the combined system is designed in detail. Finally, the correctness and realizability of the combined system are verified by simulation and experiment.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761;TN713.8

【参考文献】