有源电力滤波器滞环控制优化设计

发布时间：2018-01-13 21:22

本文关键词：有源电力滤波器滞环控制优化设计　出处：《太原理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着电力电子器件的不断更新换代,电力电子技术也在蓬勃发展,这些装置在方便人们日常生活、节约能源、提高生产效率等方面起着重要作用,但电力电子装置大多采用非线性元件,所以由电流变换引起的谐波问题也同样困扰着我们。大量谐波和无功电流注入电网会使得电网功率因数降低,电能使用效率变差,而且会导致用户用电设备出现安全隐患,严重时甚至会引起电力系统继电保护装置误动作等问题。与早期的无源滤波相比,有源滤波器(APF)在补偿谐波和无功电流和净化电网方面有着十分显著的效果,有源滤波器不但体积小而且性能可靠,因此有源滤波器成为近十年来有关电能质量方面研究的热点。本文以三相三线制的并联型APF系统为研究对象,介绍了APF的基本原理和拓扑结构。在谐波电流检测方面采用了基于瞬时无功功率理论的ip-iq检测方法。电流跟踪控制方法则是在传统滞环控制的基础上,通过对滞环原理及模型的分析,对其进行优化设计,使其原有的开关频率不稳的问题得以改善。该方法能有效协调系统参数,在系统参数变化的情况下仍然能实现指令电流的精确跟踪。在MATLAB/SIMULINK仿真环境下搭建了APF系统的仿真模型。模型主要包括：主电路、谐波检测及计算模块、电流跟踪控制模块几大部分。电流跟踪控制模块中的环宽计算模块可以根据实时反馈的系统参数计算合理的环宽数值,并通过编写S函数对其开关信号进行有效控制。仿真结果表明，，传统滞环控制和优化后的控制方法都能精确跟踪指令电流，达到预期补偿效果。在开关频率侧，可以清楚地看到优化后的方法能使得开关频率相对稳定，从而弥补了传统滞环控制方法的不足。完善了信号检测调理电路，并在以TMS320F2812为核心的硬件平台上对控制方法进行了实验验证。编写了包括主程序、捕获中断、A/D采样滤波、谐波计算及补偿等功能模块子程序。在硬件平台的基础上，在CCS3.3中对程序进行调试，实验结果证明了本文优化后滞环控制方法的可行性和正确性。
[Abstract]:With the continuous upgrading of power electronic devices, power electronics technology is also booming. These devices play an important role in facilitating people's daily life, saving energy, improving production efficiency and so on. However, most power electronic devices use nonlinear elements, so the harmonic problem caused by current transformation also puzzles us. A large number of harmonics and reactive currents injected into the power grid will reduce the power factor of the power grid. The efficiency of electric energy becomes worse, and it will lead to the safety hidden trouble of the consumer's power equipment, and even cause the maloperation of the relay protection device in the power system when it is serious, compared with the passive filter in the early period. Active power filter (APF) has remarkable effect in compensating harmonic and reactive current and purifying power network. Active filter is not only small in size but also reliable in performance. Therefore, active power filter (APF) has become a hot topic in the field of power quality in recent ten years. In this paper, the three-phase three-wire parallel APF system is taken as the research object. The basic principle and topological structure of APF are introduced. The ip-iq detection method based on instantaneous reactive power theory is adopted in harmonic current detection. The current tracking control method is based on the traditional hysteresis control. Go. Based on the analysis of hysteresis theory and model, the optimal design is carried out to improve the original switching frequency instability problem. This method can effectively coordinate the system parameters. The accurate tracking of instruction current can still be realized even when the system parameters change. The simulation model of APF system is built in MATLAB/SIMULINK environment. The model includes main circuit, harmonic detection and calculation module. The loop width calculation module in the current tracking control module can calculate the reasonable ring width value according to the real-time feedback system parameters. The simulation results show that the traditional hysteresis control method and the optimized control method can track the command current accurately and achieve the desired compensation effect. It can be clearly seen that the optimized method can make the switching frequency relatively stable, thus making up for the shortcomings of the traditional hysteresis control method. The signal detection and conditioning circuit is perfected, and the control method is verified on the hardware platform with TMS320F2812 as the core. The main program is written to capture the interrupt. A / D sampling filter, harmonic calculation and compensation module subroutine. On the basis of the hardware platform, the program is debugged in CCS3.3. The experimental results show the feasibility and correctness of the optimization of the rear hysteresis control method in this paper.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713.8;TM761

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