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| 折扣與優(yōu)惠：團(tuán)購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘 要:隨著電力技術(shù)的發(fā)展，非線性的半導(dǎo)體元件和含有電弧的非線性設(shè)備在電力系統(tǒng)中得到廣泛的應(yīng)用，它迫使電能質(zhì)量下降，給電力系統(tǒng)和各類用電設(shè)備帶來嚴(yán)重的威脅。所以這里我們要對(duì)諧波抑制的方法進(jìn)行研究，這對(duì)提高電能質(zhì)量，維護(hù)電力系統(tǒng)的經(jīng)濟(jì)、安全運(yùn)行意義重大。 本文主要對(duì)小波變換和瞬時(shí)無功功率理論兩種諧波抑制的方法進(jìn)行了分析和仿真。首先，對(duì)基于瞬時(shí)無功功率理論的兩種經(jīng)典方法即p-q檢測法、ip-iq檢測法進(jìn)行了分析、比較，兩種方法都具有較好的精確性，但實(shí)時(shí)性都不好；然而在電網(wǎng)電壓發(fā)生畸變時(shí)，ip-iq檢測法依然能夠保證其精確性，但p-q檢測法就存在誤差了。原來的ip-iq檢測法由于低通濾波器在保證了實(shí)時(shí)性的基礎(chǔ)上，不可能完全將諧波濾除掉，對(duì)仿真結(jié)果總會(huì)產(chǎn)生影響，本文提出了以ip-iq檢測法改進(jìn)的方法，以一個(gè)計(jì)算ip-iq直流分量的模塊代替低通濾波器(LPF)得到ip、iq的直流分量，就可以比較精確的計(jì)算出直流分量了，從而得到較好的有功電流分量瞬時(shí)值。但是改進(jìn)的算法實(shí)時(shí)性仍然不夠好，在實(shí)時(shí)性要求較高的場合，這幾種方法都不適用，所以本文又對(duì)小波分析理論進(jìn)行分析和仿真，將小波變換應(yīng)用到諧波檢測中，結(jié)果表明該方法在精確性和實(shí)時(shí)性上都顯示出很好的優(yōu)越性，很好地解決了上述幾種方法實(shí)時(shí)性不好的缺陷。 關(guān)鍵詞：電力系統(tǒng) 諧波 瞬時(shí)無功功率 小波變換
ABSTRACT:With development of the power of technology, nonlinear semiconductor components and non-linear devices containing arc in the power system has been widely used. It forces the power quality decline, and Endanger all kinds of electrical equipment and power systems.So we want to study harmonic suppression method, which can improve power quality, is significant to maintain power system economic, safe of operation. This paper focuses on wavelet transform and instantaneous reactive power theory two kinds of harmonic suppression methods for analysis and simulation. First, based on instantaneous reactive power theory two classic methods that is p-q assay, ip-iq detection method were analyzed and compared, Both methods have a better accuracy, but timeliness is not good. However, when the grid voltage distorted, ip-iq detection method is still able to ensure its accuracy, but there is error with pq detection method. original Ip-iq detection due to the low-pass filter to ensure the real-time, it is impossible to completely filter out harmonics, that will always have an impact on simulation results, This paper proposed a method to improve ip-iq detection, approach to a calculating modules of ip-iq the DC component instead of a low-pass filter (LPF) to obtain ip, iq the DC component, it can be more accurately calculate the DC component a, thereby obtaining a better instantaneous of active current component. However, the improved algorithm timeliness is still not good enough, in the occasion which required real-time for strict, these methods do not apply, Therefore, this paper has analyzed and simulated the wavelet analysis theory, the wavelet transform is applied to harmonic detection, The results show that the method on the accuracy and timeliness have shown the good superiority, And solves the defects of aforementioned methods which is bad real. Keywords: Power Systems；harmonic；Instantaneous reactive power；wavelet transform |
