APF直流母线电压控制的研究.docVIP

APF直流母线电压控制的研究 摘 要 随着电力电子装置的广泛应用，大量的谐波和无功电流注入电网，引起电网污染，造成电能质量问题日益严重。有源电力滤波器(active power filter，APF)是补偿电力系统谐波及无功功率的重要装置，其控制的实时性和准确性是实现有效补偿的一个关键。 本文叙述有源电力滤波器发展现状，趋势，分类，基本结构和原理，研究了有源电力滤波器直流侧与交流侧能量如何交换，直流母线电容与电源电压的关系，以及从理论上分析了直流母线电压波动的原因，其次在直流母线电压检测之后加上一个二阶低通滤波器，滤除其波动，建立模型进行仿真，以此选取直流母线电压和交流侧电感的参数。利用MATLAB建立有源电力滤波器仿真模型，并在传统的基于PI控制的直流母线电压控制的基础上，提出了模糊PI复合控制方法。 对三相三线制并联型APF提出直流母线电压控制的两种方法，分别是常规PI控制和模糊PI复合控制，对其两种方法进行对比，模糊PI复合控制兼顾了模糊控制与PI控制的优点，具有超调量小、动态性能好、抗干扰能力强、静态误差小的特点，其控制效果明显优于常规PI控制。 关键词：有源电力滤波器；Abstract With the wide application of power electronic equipments in power system，more harmonic and reactive current are poured into the power system，which cause power pollution and make the power quality problem increasingly serious Active power filter (APF) is an important equipment to compensate harmonic and reactive current in power system and the key of the effective compensation lies in the real-time and accurate contro1 This thesis describes the development of active power filter status, trends, classification, basic structure and principle, introduced the DC side APF how the energy exchange with the AC side and DC link capacitor voltage between the supply and theoretically analyzed DC-link voltage fluctuation causes, followed by detection of the DC-link voltage to add a second order low-pass filter, filter out the volatility, model simulation, as selected DC-link voltage and the AC side inductance parameters. Establishment of active power filter using MATLAB simulation model and the traditional PI control based on the DC-link voltage control, based on a fuzzy PI complex control method. For a three-phase three-wire shunt APF, the two methods of the DC-link voltage control are proposed , namely conventional PI control and fuzzy PI composite control. By contrast of its two methods, fuzzy PI compound control method is both the fuzzy control and PI control of the advantages, has a small overshoot, dynamic performance, anti-interference ability, the characteristics of the s