新型混合型大功率有源电力滤波器控制方法及装置的研究
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摘要
本论文以江西某铜箔厂的谐波抑制和无功补偿为研究对象,以本文提出的新型混合型大功率有源电力滤波器NHHAPF(Novel Hybrid High-capacity Active Power Filter)的实现为主线,对NHHAPF的滤波原理、补偿特性、控制算法和装置研制等方面进行了详细的研究,形成了较为完善的NHHAPF系统技术方案。
     首先,本文针对大型工矿企业在谐波抑制的同时需要补偿大容量的无功功率的要求,分析和比较了目前常用的混合型有源电力滤波器的拓扑结构,提出了一种新颖的结构—新型混合型大功率有源电力滤波器NHHAPF。分析了NHHAPF的滤波原理:NHHAPF的有源部分相当于在电网支路串联了一个可控的谐波阻抗,当该谐波阻抗足够大时,流入电网的谐波电流将会很小,接近于零,起到抑制谐波电流的作用;同时可以抑制无源部分与电网阻抗间的谐振。此外还研究了NHHAPF的稳态补偿特性,无源滤波器失谐的情况下的补偿特性和抑制系统谐振的性能。然后在分析了有源电力滤波器控制方法研究现状的基础上,针对有源电力滤波器的控制参考信号为周期量这一特点,提出了递推积分PI控制算法,消除了系统的稳态误差,并将递推积分PI控制算法与模糊控制算法相结合。在误差较大时采用模糊控制算法,以提高系统的鲁棒性和动态性能;在误差较小时采用递推积分PI控制算法,以提高系统的控制精度,构成了模糊-递推积分PI复合控制算法。最后详细阐述了应用于江西某铜箔厂的NHHAPF系统装置的工程实现方案,包括主电路子系统、控制子系统和谐波分析子系统的系统组成和参数设计。其中谐波分析软件由七大功能模块组成,各个功能模块均能进行自由切换和打印。
Taking the harmonic suppression and reactive power compensation in a copper foil factory in Jiang Xi province as the object of study, this thesis is focused on structure, principle, control method and equipment of NHHAPF—Novel Hybrid High-capacity Active Power Filter. This research presents a self-contained technical solution of NHHAPF system.
     Firstly, after analyzing and comparing the existing Hybrid Active Power Filters, a NHHAPF is proposed here to meet the given situation of big factories and mine harmonic elimination. Active part is equivalent to a controlled harmonic impedance series connected with the main line. When the harmonic impedance is big enough, the harmonic current flowing into the grid will be close to zero. In the meantime, the possibility of resonance between passive power filters and grid impedance can be damped by controlling active part. In addition, the harmonic eliminating performance and the resonance damping capability are studied under the situation of a variety of power source impedance and mistuning of passive power filters. Secondly, based on the research actuality of Active Power Filter control methods, a fuzzy-recursive integral PI complex control algorithm is proposed. According to the periodic character of the reference signal, the recursive integral PI algorithm is proposed to archive zero steady state error. Besides, this thesis combines recursive integral PI algorithm with fuzzy control algorithm. In big error state the fuzzy control algorithm is used for enhancing the robustness and dynamic performance. In small error state the recursive integral PI algorithm is used for improving the control precision. Finally, a harmonic eliminating equipment system based on NHHAPF is developed. The equipment includes main circuit subsystem, control subsystem and harmonic analysis subsystem. The harmonic analysis software are composed of 7 functional modules, each module can switch and print conveniently.
引文
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