基于分频调节RAPF位置策略的环形配电网背景谐波抑制研究
发布时间：2019-03-21 17:53
【摘要】：环形配电网的功率因数校正电容和系统电感间存在谐波振荡,谐波振荡使得环形配电线路中的电压和电流谐波含量增加,电能质量恶化。安装在环形配电线中点的阻性有源电力滤波器(Resistive Active Power Filter,RAPF)在阻抗匹配(RAPF的等效阻抗等于Z/2,其中Z为线路特征阻抗)时能够抑制整条线路上的谐波振荡。然而,实际中线路参数是变化的,线路参数变化使阻抗匹配条件不再满足,从而影响RAPF的抑制效果。为了得到一种能够有效抑制环形线路谐振放大,同时对线路参数变化有更好适应性的方法,本文分别建立了RAPF安装在环形配电线中点和对称安装在环形配电线上时的等效分布参数模型,并推导出了相应的谐波电压驻波表达式,进而对环形配电网的谐波放大原理进行了理论分析。根据得到的谐波电压驻波表达式,本文对比了安装在线路中点且阻抗匹配的RAPF和对称安装在不同位置的分频调节RAPF的抑制效果,提出了一种适用于环形配电网的分频调节RAPF位置策略:若线路长度小于谐波波长的一半,靠近线路中点的对称位置为最优安装位置;若线路长度大于谐波波长的一半,距谐波源四分之一波长的对称位置为最优安装位置。此外,本文对安装在环形线路中点的RAPF和按本文提出的位置策略对称安装的RAPF在电导增益变化时的谐波抑制效果进行了探讨,说明本文提出的分频调节RAPF位置策略在电导增益大于等于匹配电导2/Z时均能得到很好的谐波抑制效果,因此对线路参数变化有更好的适应性。本文根据环形配电线的集总参数模型,搭建了10km环形配电线的仿真电路和实验平台,完成了线路参数不变、线路参数变化和线路中含有非线性负载时的仿真和实验,仿真和实验结果验证了该方案的有效性。
[Abstract]:There is harmonic oscillation between the power factor correction capacitance and the system inductance in the annular distribution network. The harmonic oscillation causes the harmonic content of voltage and current in the loop distribution line to increase and the power quality worsen. The resistive active power filter (Resistive Active Power Filter,RAPF) installed at the center of the ring distribution line can suppress the harmonic oscillation on the whole line when the impedance matching (the equivalent impedance of RAPF is equal to Z ~ (2 +), where Z is the characteristic impedance of the line). However, in practice, the line parameters are changed and the impedance matching conditions are no longer satisfied, thus affecting the suppression effect of RAPF. In order to obtain a method which can effectively suppress the resonant amplification of the ring line, and at the same time has better adaptability to the variation of the line parameters. In this paper, the equivalent distribution parameter models of RAPF installed in the center point of the ring distribution line and symmetrically mounted on the ring distribution line are established, and the corresponding harmonic voltage standing wave expressions are derived. Then the harmonic amplification principle of ring distribution network is analyzed theoretically. According to the expression of harmonic voltage standing wave, this paper compares the suppression effect of impedance-matched RAPF installed at the middle point of the line and the frequency-division RAPF installed symmetrically in different locations. This paper presents a frequency division RAPF position strategy for annular distribution network. If the length of the line is less than half of the harmonic wavelength, the symmetrical position near the middle point of the line is the optimal installation position. If the length of the line is more than half of the harmonic wavelength, the symmetrical position of the 1/4 wavelength of the distance harmonic source is the optimal installation position. In addition, the harmonic suppression effects of the RAPF installed at the center of the ring line and the RAPF installed symmetrically according to the position strategy proposed in this paper under the change of conductance gain are also discussed in this paper. It is shown that the proposed RAPF position strategy can achieve good harmonic suppression effect when the conductance gain is greater than or equal to 2 Z, so it has better adaptability to the variation of line parameters. According to the lumped parameter model of the ring distribution line, the simulation circuit and the experiment platform of the 10km loop distribution line are built. The simulation and experiment of the circuit parameter invariance, the line parameter change and the nonlinear load in the line are completed. Simulation and experimental results verify the effectiveness of the proposed scheme.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761;TN713.8
本文编号：2445177
[Abstract]:There is harmonic oscillation between the power factor correction capacitance and the system inductance in the annular distribution network. The harmonic oscillation causes the harmonic content of voltage and current in the loop distribution line to increase and the power quality worsen. The resistive active power filter (Resistive Active Power Filter,RAPF) installed at the center of the ring distribution line can suppress the harmonic oscillation on the whole line when the impedance matching (the equivalent impedance of RAPF is equal to Z ~ (2 +), where Z is the characteristic impedance of the line). However, in practice, the line parameters are changed and the impedance matching conditions are no longer satisfied, thus affecting the suppression effect of RAPF. In order to obtain a method which can effectively suppress the resonant amplification of the ring line, and at the same time has better adaptability to the variation of the line parameters. In this paper, the equivalent distribution parameter models of RAPF installed in the center point of the ring distribution line and symmetrically mounted on the ring distribution line are established, and the corresponding harmonic voltage standing wave expressions are derived. Then the harmonic amplification principle of ring distribution network is analyzed theoretically. According to the expression of harmonic voltage standing wave, this paper compares the suppression effect of impedance-matched RAPF installed at the middle point of the line and the frequency-division RAPF installed symmetrically in different locations. This paper presents a frequency division RAPF position strategy for annular distribution network. If the length of the line is less than half of the harmonic wavelength, the symmetrical position near the middle point of the line is the optimal installation position. If the length of the line is more than half of the harmonic wavelength, the symmetrical position of the 1/4 wavelength of the distance harmonic source is the optimal installation position. In addition, the harmonic suppression effects of the RAPF installed at the center of the ring line and the RAPF installed symmetrically according to the position strategy proposed in this paper under the change of conductance gain are also discussed in this paper. It is shown that the proposed RAPF position strategy can achieve good harmonic suppression effect when the conductance gain is greater than or equal to 2 Z, so it has better adaptability to the variation of line parameters. According to the lumped parameter model of the ring distribution line, the simulation circuit and the experiment platform of the 10km loop distribution line are built. The simulation and experiment of the circuit parameter invariance, the line parameter change and the nonlinear load in the line are completed. Simulation and experimental results verify the effectiveness of the proposed scheme.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761;TN713.8
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