三相四线制三电平有源电力滤波器检测方法的研究

发布时间：2018-07-05 15:00

本文选题：三相四线制 + 有源电力滤波器　；参考：《河北工业大学》2014年硕士论文

【摘要】：现在我国主要采用三线四线制供电系统。当三相系统平衡时，流过零线的电流几乎为零；当三相系统不平衡时，零线上的电流很大，甚至可能达到相电流的1.5倍，并且现在的民用负荷很多都是单相负载，会使电网中产生大量的零序谐波分量，在零线上叠加后会造成零线过流。零线电流过大会造成非常严重的后果，一方面零线导线的横截面积与相线导线的横截面积相差不大，一旦流过零线的电流过大，必然会导致零线严重发热；另一方面零线上并没有安装自动保护装置，，当流过零线的电流过大时，不能自动切除故障线路。在三相四线制系统中，有源电力滤波器不仅需要补偿相序电流还需要补偿零序电流，避免因电流过大而造成火灾的隐患。三相四线制有源滤波器主要是用来补偿谐波电流，由两部分构成：检测环节和控制环节。检测环节是指谐波电流的检测，即将负载电流中的谐波电流检测出来。控制环节即谐波电流的补偿，即将检测出的谐波电流值按照一定算法变成控制脉冲信号，控制逆变器产生与检测电流相对应的补偿电流，输送回电网的负载中。本文主要重点研究三相四线制三电平有源滤波器的检测部分。在matlab/simulink环境下搭建了三相四线制三电平有源滤波器的数学模型，对基于快速傅里叶变换（FFT）的谐波电流检测和基于瞬时无功（ip-iq）的谐波电流检测方法进行研究；引入了直流侧电压控制（PI）环节，控制采用SVPWM方法，实现整体功能的仿真；在CCS环境下进行有源滤波器的软件设计；以DSP F28335为核心板，设计了有源滤波器的硬件电路。
[Abstract]:Now China mainly adopts three-wire and four-wire power supply system. When the three-phase system is balanced, the current passing through the zero line is almost zero; when the three-phase system is unbalanced, the current on the zero line is very large, possibly 1.5 times the current of the phase current, and many of the current civilian loads are single-phase loads. A large number of zero-sequence harmonic components will be generated in the power network, and the superposition of zero lines will result in zero-line overcurrent. On the one hand, the cross section area of zero wire is not different from that of phase line conductor, once the current passing through zero line is too large, it will inevitably lead to serious heating of zero line. On the other hand, no automatic protection device is installed on the zero line. When the current passing through the zero line is too large, the fault line cannot be automatically removed. In the three-phase four-wire system, the active power filter not only needs to compensate the phase-sequence current, but also needs to compensate the zero-sequence current, so as to avoid the hidden danger of fire caused by the excessive current. Three-phase four-wire active filter is mainly used to compensate harmonic current, which consists of two parts: detection and control. Detection is the detection of harmonic current, that is, the detection of harmonic current in the load current. The control link is the compensation of harmonic current, which changes the detected harmonic current into a control pulse signal according to a certain algorithm, and controls the inverter to generate the compensation current corresponding to the detection current, which is transported back to the load of the power network. This paper focuses on the three-phase four-wire three-level active filter detection. The mathematical model of three-phase four-wire three-level active filter is built in matlab/simulink environment. The methods of harmonic current detection based on fast Fourier transform (FFT) and harmonic current detection based on instantaneous reactive power (ip-iq) are studied. The DC side voltage control (Pi) link is introduced, SVPWM method is used to realize the simulation of the whole function, the active power filter software is designed in CCS environment, and the hardware circuit of the active power filter is designed with DSP F28335 as the core board.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN713.8;TM761

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