基于分頻調(diào)節(jié)RAPF位置策略的環(huán)形配電網(wǎng)背景諧波抑制研究
發(fā)布時間：2019-03-21 17:53
【摘要】：環(huán)形配電網(wǎng)的功率因數(shù)校正電容和系統(tǒng)電感間存在諧波振蕩,諧波振蕩使得環(huán)形配電線路中的電壓和電流諧波含量增加,電能質(zhì)量惡化。安裝在環(huán)形配電線中點的阻性有源電力濾波器(Resistive Active Power Filter,RAPF)在阻抗匹配(RAPF的等效阻抗等于Z/2,其中Z為線路特征阻抗)時能夠抑制整條線路上的諧波振蕩。然而,實際中線路參數(shù)是變化的,線路參數(shù)變化使阻抗匹配條件不再滿足,從而影響RAPF的抑制效果。為了得到一種能夠有效抑制環(huán)形線路諧振放大,同時對線路參數(shù)變化有更好適應(yīng)性的方法,本文分別建立了RAPF安裝在環(huán)形配電線中點和對稱安裝在環(huán)形配電線上時的等效分布參數(shù)模型,并推導(dǎo)出了相應(yīng)的諧波電壓駐波表達式,進而對環(huán)形配電網(wǎng)的諧波放大原理進行了理論分析。根據(jù)得到的諧波電壓駐波表達式,本文對比了安裝在線路中點且阻抗匹配的RAPF和對稱安裝在不同位置的分頻調(diào)節(jié)RAPF的抑制效果,提出了一種適用于環(huán)形配電網(wǎng)的分頻調(diào)節(jié)RAPF位置策略:若線路長度小于諧波波長的一半,靠近線路中點的對稱位置為最優(yōu)安裝位置;若線路長度大于諧波波長的一半,距諧波源四分之一波長的對稱位置為最優(yōu)安裝位置。此外,本文對安裝在環(huán)形線路中點的RAPF和按本文提出的位置策略對稱安裝的RAPF在電導(dǎo)增益變化時的諧波抑制效果進行了探討,說明本文提出的分頻調(diào)節(jié)RAPF位置策略在電導(dǎo)增益大于等于匹配電導(dǎo)2/Z時均能得到很好的諧波抑制效果,因此對線路參數(shù)變化有更好的適應(yīng)性。本文根據(jù)環(huán)形配電線的集總參數(shù)模型,搭建了10km環(huán)形配電線的仿真電路和實驗平臺,完成了線路參數(shù)不變、線路參數(shù)變化和線路中含有非線性負(fù)載時的仿真和實驗,仿真和實驗結(jié)果驗證了該方案的有效性。
[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.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM761;TN713.8
本文編號：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.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM761;TN713.8
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