单相桥式整流滤波电路类负荷容性特性及衰减效应研究

发布时间：2018-01-13 08:27

本文关键词：单相桥式整流滤波电路类负荷容性特性及衰减效应研究　出处：《重庆大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前，单相桥式整流滤波电路类的非线性电力电子设备已越来越广泛地分布于低压配电系统中。该类负荷单个功率小，数量多，分布区域广且谐波含量丰富。当大量的谐波注入到配电系统中，造成供电电压严重畸变，对配电系统中的负荷和附近的电子装置造成危害。由于滤波电容的存在，使得电路可能呈容性，一方面对配电系统无功补偿起一定的作用；另一方面也可能与系统电感将引发谐波谐振。本文基于单相桥式整流滤波电路的频域谐波耦合导纳矩阵模型，分别推导出该类电路的基波和谐波等效电路。并结合等效电路，通过理论分析，，仿真研究及实验验证了单相桥式整流滤波电路在各次谐波处的容、感性特性。并比较分析了谐波电流的衰减效应与谐波电压的波峰系数和位移系数的关系，通过实验对这一关系进行了验证。具体工作如下： ①基于频域谐波耦合导纳矩阵模型，分别推导出理想电压下的基波等效电路和畸变电压下的谐波等效电路。 ②根据推导出的基波等效电路，通过理论分析基波等效导纳的性质及输入端基波电流与电压相位差的情况，说明了单相桥式整流滤波电路在基波处都呈容性且基波电流与电压相位差较集中。并通过仿真和实验验证了该结论的正确性。另外，根据谐波等效电路，通过对其各支路电流特性的分析，研究了单相桥式整流滤波电路在各次谐波处的容、感性特性，并提出了使得电路在各次谐波处呈容性的负载等值电阻R的范围，以此来规避谐波谐振的发生。 ③仿真分析了单相桥式整流滤波电路谐波电流的衰减(放大)效应与谐波电压的波峰系数和位移系数的关系。指出这两种电压波形指标单独用于反映衰减系数的误差较大。提出了谐波电流的衰减(放大)效应是波峰特性与位移特性共同作用的结果，且当波峰系数和位移系数同时满足时，衰减(放大)效应的程度更严重，并通过实验验证了该结论。
[Abstract]:At present, the nonlinear power electronic equipment single-phase bridge rectifier filter circuit class has been more and more widely distributed in the low-voltage distribution system. The power load of the single small quantity, wide distribution and rich harmonic content. When a large number of harmonics injected into the power system, resulting in serious distortion of the supply voltage, the harm to the power system the load and the electronic device nearby. Due to the filter capacitor, the circuit may be capacitive, a reactive power compensation play a role in the distribution system; on the other hand, may also be a system inductance will lead to harmonic resonance. The frequency domain harmonic coupled admittance matrix model of the single-phase bridge rectifier filter circuit based on, respectively. This kind of circuit is the fundamental harmonic equivalent circuit. Combined with the equivalent circuit, through theoretical analysis, simulation and experimental verification of the single-phase bridge rectifier filter circuit The relation between the attenuation effect of harmonic current and the peak wave coefficient and displacement coefficient of harmonic voltage is compared and analyzed. The relationship is verified through experiments.
(1) based on the frequency domain harmonic coupling admittance matrix model, the equivalent circuit of the fundamental wave under the ideal voltage and the harmonic equivalent circuit under the distorted voltage are derived respectively.
According to the fundamental wave equivalent circuit is deduced, through theoretical analysis and properties of input fundamental voltage and current phase difference of the equivalent admittance, the single-phase bridge rectifier filter circuit is capacitive phase and fundamental current and voltage difference is concentrated on the fundamental place. And through the simulation and experimental results verify the correctness of the conclusion. In addition, according to the harmonic equivalent circuit, through the analysis of the current of each branch characteristics, research the single-phase bridge rectifier filter circuit in its harmonic content, perceptual characteristics, and puts forward that the circuit is capacitive load equivalent resistance R in the range of each harmonic, in order to avoid harmonic resonance the occurrence.
The simulation and analysis of the attenuation of single-phase bridge rectifier filter circuit harmonic current (amplification) relationship between wave coefficient and displacement coefficient and harmonic voltage. The two voltage waveform index is used to reflect the attenuation coefficient of single error. The attenuation of harmonic current is proposed (amplification) effect is the common wave characteristics and displacement characteristics the results, and when the wave crest coefficient and displacement coefficient at the same time, the attenuation (amplification) effect is more severe, and the conclusion is verified by experiment.

【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461

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