【作者】 邝乃兴；

【导师】 彭方正； 钱照明；

【作者基本信息】 浙江大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 本文主要研究了串联混合有源电力滤波器的性能优化技术，从谐波检测环节，控制策略等方面提出了优化电力滤波器性能的措施。本文首先简要介绍了有源电力滤波器的发展现状，主要从应用现状、有源电力滤波器主电路拓扑、谐波检测理论和控制策略的发展现状进行介绍。在此基础上，介绍了一种新型串联混合有源电力滤波器拓扑，该拓扑通过增加一个串联基波谐振电路提高了滤波器的滤波性能。谐波检测的准确性和实时性是影响有源电力滤波器滤波性能的一个重要因素，其中基于同步旋转坐标变换的谐波检测方法中的数字低通滤波器是影响谐波检测性能的一个关键因素。采用经典滤波器时，其滤波性能、采样频率和DSP有限字长之间存在矛盾，本文采用指数平均滤波器级联来构成滤波器的新型方法，解决了DSP有限字长和滤波性能之间的矛盾，可以有效的解决以上三者的矛盾。串联混合有源电力滤波器采用检测电网谐波电流的控制方式时，滤波性能和系统的稳定性之间存在矛盾。本文提出了一种新型控制策略。该控制策略的原理是使串联有源滤波器在谐波频率下等效为一个电阻和一个电感的串联，在基波频率下等效为零电阻，同时提高滤波性能和系统稳定性，较好的解决了检测电网谐波电流控制方式的这种缺点。有源滤波器直流侧电压的稳定在较大程度上影响了滤波器性能。模型的准确程度也影响了直流侧电压控制稳定程度。本文建立了考虑损耗的直流侧电压控制模型，在此基础上设计了控制器。本文搭建了仿真和实验平台，给出了仿真和实验结果，对上述各改进措施进行了验证。更多还原

【Abstract】 The state-of-the-art of active power filters (APFs) is described first. In order to improve the harmonic suppression performance of APFs, a novel topology of Series Hybrid Active Power Filters where a series LC resonance circuit is added, is analyzed in this thesis.Both veracity and real-time requirements to the harmonic detection circuit are important factors which influence the performance of APFs. An exponential average low pass filter with a cascade form to effectively solve the conflict between the veracity of harmonic detection and real-time requirements is proposed in this thesis. The finite word length of DSP design and realization of a high performance DSP based digital low pass filter are presented in detail.When using grid harmonic current detection control strategy, a conflict between the filter performance and the system stability occurs. This thesis presents a novel control strategy through a proportional plus derivative controller to solve this problem.Keeping the DC-link voltage of the series active power filter as a constant is required to obtain high filter performance. A small-signal model of the DC-link voltage and the controller design are presented in this thesis too.The simulation and experimental results validate these proposed methods.更多还原