本文選題：諧波檢測(cè)　切入點(diǎn)：有源電力濾波器　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著非線性負(fù)載的使用,其產(chǎn)生的諧波電流對(duì)電網(wǎng)的污染越來越嚴(yán)重。有源電力濾波器(APF)作為治理諧波改善電能質(zhì)量的電子設(shè)備,在電力系統(tǒng)諧波治理中起到了關(guān)鍵作用,而其諧波檢測(cè)環(huán)節(jié)的性能直接影響整個(gè)系統(tǒng)的補(bǔ)償效果。因此,論文以并聯(lián)有源濾波器為研究對(duì)象,圍繞如何提高有源濾波器諧波檢測(cè)環(huán)節(jié)的性能做了深入研究。首先,論文從瞬時(shí)無功功率的角度對(duì)p-q和ip-iq算法進(jìn)行諧波檢測(cè)的理論基礎(chǔ)進(jìn)行分析,并對(duì)p-q和ip-iq算法在電網(wǎng)電壓畸變下的諧波檢測(cè)性能進(jìn)行了對(duì)比,結(jié)果表明:對(duì)于ip-iq算法來講,其諧波檢測(cè)性能受電網(wǎng)電壓中諧波的影響較小,因此,當(dāng)電網(wǎng)電壓存在畸變的工況下應(yīng)優(yōu)先選擇ip-iq諧波檢測(cè)算法。此外,論文對(duì)低通濾波類型、截止頻率、階數(shù)對(duì)其性能的影響進(jìn)行了分析,并與均值濾波對(duì)比表明,在穩(wěn)態(tài)情況下,均值濾波不僅可以提高動(dòng)態(tài)響應(yīng)速度,而且可以改善諧波檢測(cè)精度。其次,鎖相環(huán)實(shí)時(shí)準(zhǔn)確的鎖定電網(wǎng)電壓頻率是諧波電流檢測(cè)的重要一環(huán)。因此,論文對(duì)基于同步旋轉(zhuǎn)坐標(biāo)下dq變換的鎖相環(huán)進(jìn)行分析,結(jié)果表明當(dāng)電網(wǎng)電壓中含有諧波時(shí),同步旋轉(zhuǎn)坐標(biāo)系下產(chǎn)生的二倍工頻波動(dòng)會(huì)影響鎖相環(huán)的性能,從而影響諧波電流檢測(cè)的性能。為了提高鎖相環(huán)在電網(wǎng)電壓含有諧波時(shí)的性能,文中采用了基于廣義二階積分器的鎖相環(huán),利用廣義二階積分器的帶通特性實(shí)現(xiàn)對(duì)基波分量的提取和對(duì)諧波電壓的抑制,從而降低電網(wǎng)電壓畸變對(duì)鎖相環(huán)的影響。此外,文中詳細(xì)分析了二階廣義積分器的主要參數(shù)對(duì)鎖相環(huán)性能的影響,并通過仿真驗(yàn)證了基于廣義二階積分器鎖相環(huán)的ip-iq諧波檢測(cè)算法可以得到總諧波畸變率較小的電流。最后,為了驗(yàn)證基于廣義二階積分器的鎖相環(huán)與均值濾波結(jié)合的ip-iq算法的可行性與有效性,通過搭建的并聯(lián)有源電力濾波器系統(tǒng)模型與實(shí)驗(yàn)樣機(jī),采用基于廣義二階積分器的鎖相環(huán)與均值濾波結(jié)合的ip-iq諧波檢測(cè)算法進(jìn)行系統(tǒng)仿真與實(shí)驗(yàn)驗(yàn)證,結(jié)果表明:補(bǔ)償后的網(wǎng)側(cè)電流波形滿足相關(guān)要求。
[Abstract]:With the use of nonlinear load, the harmonic current produced by APFF is becoming more and more serious to the power network. APFF (active Power filter), as an electronic device for harmonic control and improvement of power quality, plays a key role in harmonic control of power system. The performance of harmonic detection directly affects the compensation effect of the whole system. Therefore, the thesis takes shunt active power filter as the research object, and makes a deep research on how to improve the performance of harmonic detection link of active power filter. In this paper, the theoretical basis of harmonic detection based on p-q and ip-iq algorithm is analyzed from the angle of instantaneous reactive power, and the harmonic detection performance of p-q and ip-iq algorithm under voltage distortion is compared. The results show that: for ip-iq algorithm, The harmonic detection performance is less affected by the harmonics in the grid voltage. Therefore, the ip-iq harmonic detection algorithm should be preferred when the voltage is distorted. In addition, the low pass filter type, cut-off frequency, cut-off frequency should be selected in this paper. The effect of order number on its performance is analyzed, and the comparison with mean filter shows that mean filter can not only improve the dynamic response speed but also improve the accuracy of harmonic detection in steady state. The phase-locked loop (PLL) is an important link in harmonic current detection. Therefore, the phase-locked loop based on DQ transformation in synchronous rotation coordinates is analyzed in this paper. The results show that when the voltage of the power system contains harmonics, The double power frequency fluctuation in synchronous rotating coordinate system will affect the performance of phase-locked loop, thus affecting the performance of harmonic current detection. In order to improve the performance of phase-locked loop when the voltage of power network contains harmonics, In this paper, a phase-locked loop based on generalized second-order integrator is used to extract the fundamental component and suppress the harmonic voltage by using the band-pass characteristic of the generalized second-order integrator, so as to reduce the influence of the voltage distortion on the phase-locked loop. In this paper, the influence of the main parameters of the second order generalized integrator on the performance of the PLL is analyzed in detail, and the simulation results show that the ip-iq harmonic detection algorithm based on the generalized second-order integrator PLL can obtain the current with low total harmonic distortion. In order to verify the feasibility and validity of the ip-iq algorithm based on the generalized second-order integrator PLL and mean filter, the model of shunt active power filter system and the experimental prototype are built. The ip-iq harmonic detection algorithm based on the generalized second-order integrator combined with phase-locked loop and mean filter is simulated and verified by experiments. The results show that the compensated current waveform meets the related requirements.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM935

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本文編號(hào)：1599515