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基于TTA檢測(cè)算法的三相負(fù)荷不平衡治理研究

發(fā)布時(shí)間:2018-08-20 19:04
【摘要】:各種非線性負(fù)荷及大容量單相負(fù)荷的接入,使配電變壓器長(zhǎng)期處于不平衡運(yùn)行狀態(tài),嚴(yán)重危及了電力系統(tǒng)的安全穩(wěn)定運(yùn)行。不平衡調(diào)補(bǔ)裝置是治理不平衡現(xiàn)象的有效手段,其中補(bǔ)償電流檢測(cè)算法是影響調(diào)補(bǔ)裝置補(bǔ)償性能的關(guān)鍵技術(shù)之一。本文主要針對(duì)三相四線制不平衡負(fù)載條件下的基波負(fù)序及零序電流檢測(cè)算法進(jìn)行研究。針對(duì)上述問(wèn)題,對(duì)基于時(shí)域變換的電流檢測(cè)算法(TTA)進(jìn)行詳細(xì)分析,結(jié)果表明:當(dāng)電網(wǎng)電壓三相對(duì)稱(chēng)時(shí),TTA算法能準(zhǔn)確檢測(cè)出負(fù)載中的不平衡分量。但是,當(dāng)電網(wǎng)電壓不對(duì)稱(chēng)時(shí),由于鎖相環(huán)不準(zhǔn)確鎖相會(huì)產(chǎn)生檢測(cè)誤差,導(dǎo)致檢測(cè)到的不平衡電流分量存在誤差。為減小TTA電流檢測(cè)算法在電網(wǎng)電壓不對(duì)稱(chēng)時(shí)由于鎖相不準(zhǔn)確造成的誤差,采用由二階廣義積分器(SOGI)和電壓正序提取環(huán)節(jié)相結(jié)合的鎖相環(huán)(SOGI-PLL)。仿真驗(yàn)證了由SOGI-PLL和TTA相結(jié)合的電流檢測(cè)能有效提高傳統(tǒng)TTA檢測(cè)算法的精度。此外,為提高電流檢測(cè)環(huán)節(jié)中濾波器的動(dòng)態(tài)響應(yīng)速度,采用二階低通濾波器和帶阻濾波器串聯(lián)組合的方式進(jìn)行濾波,在不影響檢測(cè)精度的情況下大幅提高了檢測(cè)算法的動(dòng)態(tài)響應(yīng)速度。借助Matlab/Simulink搭建了三相四線制調(diào)補(bǔ)系統(tǒng)仿真模型,分別在三相電網(wǎng)電壓對(duì)稱(chēng)和不對(duì)稱(chēng)情況下進(jìn)行了仿真分析,仿真結(jié)果表明,在上述兩種情況下研究的基于廣義積分器的TTA電流檢測(cè)算法均能快速準(zhǔn)確地對(duì)負(fù)載電流中的負(fù)序及零序分量進(jìn)行提取,達(dá)到了預(yù)期效果。在此基礎(chǔ)上,在現(xiàn)場(chǎng)實(shí)際系統(tǒng)中進(jìn)行應(yīng)用,進(jìn)一步驗(yàn)證了該算法的可行性和實(shí)用性。
[Abstract]:All kinds of nonlinear load and large capacity single-phase load connection make the distribution transformer in unbalanced operation state for a long time which seriously endangers the safe and stable operation of power system. The unbalanced adjusting and compensating device is an effective means to control the unbalanced phenomenon, and the compensation current detection algorithm is one of the key technologies that affect the compensation performance of the compensation device. In this paper, the detection algorithms of fundamental negative sequence and zero sequence current under three phase four wire unbalanced load are studied. To solve the above problems, the current detection algorithm based on time-domain transform (TTA) is analyzed in detail. The results show that the proposed algorithm can accurately detect the unbalanced components in the load when the three-phase voltage is symmetrical. However, when the voltage of the power system is asymmetric, there is an error in the detection of the unbalanced current component due to the phase locked loop (PLL) inaccurate phase locking error. In order to reduce the error caused by phase locking in TTA current detection algorithm when the voltage is asymmetric, a phase-locked loop (SOGI-PLL), which is combined with the second-order generalized integrator (SOGI) and the voltage positive sequence extraction link, is adopted. Simulation results show that the current detection combined with SOGI-PLL and TTA can effectively improve the accuracy of the traditional TTA detection algorithm. In addition, in order to improve the dynamic response speed of the filter in current detection, the second-order low-pass filter and band-stop filter are combined in series to filter. The dynamic response speed of the detection algorithm is greatly improved without affecting the detection accuracy. With the help of Matlab/Simulink, the simulation model of three-phase four-wire system is built, and the simulation analysis is carried out under the condition of voltage symmetry and asymmetry of three-phase power network, respectively. The simulation results show that, In both cases, the TTA current detection algorithm based on the generalized integrator can extract the negative sequence and zero sequence components of the load current quickly and accurately, and achieve the desired results. On this basis, the algorithm is applied in the field system, and the feasibility and practicability of the algorithm are further verified.
【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(lèi)號(hào)】:TM732

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