交流系統(tǒng)與換流站交流濾波器最小串聯(lián)阻抗的分析與研究
發(fā)布時間:2018-12-29 20:45
【摘要】:交流濾波器在高壓直流輸電工程中被廣泛應(yīng)用,承擔(dān)著濾除交流側(cè)諧波和提供無功補(bǔ)償?shù)淖饔。穩(wěn)態(tài)定值計(jì)算是交流濾波器設(shè)計(jì)中的重要組成部分,計(jì)算過程中需要得到濾波器阻抗與系統(tǒng)阻抗的串聯(lián)最小阻抗值,用以計(jì)算濾波器元件上的最大定值電流電壓應(yīng)力。該文首先從理論上證明,在系統(tǒng)阻抗和濾波器阻抗的電阻值均大于零的情況下,串聯(lián)阻抗極小值點(diǎn)位于系統(tǒng)阻抗區(qū)域的邊界上。然后,引入拉格朗日乘數(shù)法,推導(dǎo)出目前常用的系統(tǒng)阻抗區(qū)域類型的串聯(lián)阻抗極小值計(jì)算公式。最后利用仿真分析法驗(yàn)證該文算法的正確性,對比結(jié)果顯示,該文提出的方法在計(jì)算精度方面較原有的找諧振點(diǎn)法更好。
[Abstract]:Ac filters are widely used in HVDC transmission projects, which play the role of filtering AC side harmonics and providing reactive power compensation. The steady-state constant value calculation is an important part in the design of AC filter. In the process of calculation, the series minimum impedance of filter impedance and system impedance should be obtained to calculate the maximum constant current voltage stress on filter elements. In this paper, it is theoretically proved that when the impedance of the system and the impedance of the filter are both greater than zero, the minimum point of the series impedance is located at the boundary of the impedance region of the system. Then the Lagrange multiplier method is introduced to derive the series impedance minima formula which is commonly used at present. Finally, the correctness of the algorithm is verified by the simulation analysis method. The comparison results show that the proposed method is better than the original resonance point finding method in the accuracy of calculation.
【作者單位】: 中國農(nóng)業(yè)大學(xué)信息與電氣工程學(xué)院北京市;南京國電南自電網(wǎng)自動化有限公司;
【分類號】:TM721.1
本文編號:2395373
[Abstract]:Ac filters are widely used in HVDC transmission projects, which play the role of filtering AC side harmonics and providing reactive power compensation. The steady-state constant value calculation is an important part in the design of AC filter. In the process of calculation, the series minimum impedance of filter impedance and system impedance should be obtained to calculate the maximum constant current voltage stress on filter elements. In this paper, it is theoretically proved that when the impedance of the system and the impedance of the filter are both greater than zero, the minimum point of the series impedance is located at the boundary of the impedance region of the system. Then the Lagrange multiplier method is introduced to derive the series impedance minima formula which is commonly used at present. Finally, the correctness of the algorithm is verified by the simulation analysis method. The comparison results show that the proposed method is better than the original resonance point finding method in the accuracy of calculation.
【作者單位】: 中國農(nóng)業(yè)大學(xué)信息與電氣工程學(xué)院北京市;南京國電南自電網(wǎng)自動化有限公司;
【分類號】:TM721.1
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