基于三相四線制的有源電力濾波器研究
發(fā)布時間：2019-02-20 07:59
【摘要】：電能作為現(xiàn)代社會中使用最廣泛的能源,其電能質(zhì)量是衡量一個國家發(fā)展水平的重要標(biāo)志之一。由于電力電子技術(shù)的飛速發(fā)展,電力電子設(shè)備得到了廣泛的使用。隨著辦公的自動化和家用電器的日益普及,三相四線制系統(tǒng)中出現(xiàn)了大量的單相非線性負(fù)載,如計(jì)算機(jī)、打印機(jī)、日光燈、變頻空調(diào)、電梯、電視機(jī)、洗衣機(jī)、電冰箱等,雖然單臺電器產(chǎn)生的諧波不會對電網(wǎng)造成很大影響,但是由于使用的數(shù)量極其龐大,并且工作的同時性強(qiáng),因而會產(chǎn)生大量諧波對電網(wǎng)造成很大的影響。本文針對辦公、住宅樓宇這類三相四線制系統(tǒng)的諧波問題,研究了諧波產(chǎn)生的原因、諧波治理的意義、諧波治理的標(biāo)準(zhǔn)、諧波抑制的措施以及有源電力濾波器國內(nèi)外研究現(xiàn)狀和基本工作原理。著重研究了三相四線制系統(tǒng)并聯(lián)有源電力濾波器的諧波電流檢測算法和補(bǔ)償電流跟蹤控制算法兩大模塊,利用MATLAB軟件設(shè)計(jì)了一個基于新型三相四橋臂逆變拓?fù)浣Y(jié)構(gòu)的有源電力濾波器模型。該有源電力濾波器模型針對現(xiàn)有的基于線性PI控制器三相鎖相環(huán)的qpii?諧波電流檢測算法在畸變不對稱電源電壓下檢測速度和檢測精度的不足,提出了一種基于可變增益非線性PI控制器三相鎖相環(huán)的諧波電流檢測算法。同時,在三相三線制三橋臂有源電力濾波器拓?fù)浣Y(jié)構(gòu)的二維空間矢量脈寬調(diào)制算法和二極管箝位式、飛躍電容箝位式逆變拓?fù)浣Y(jié)構(gòu)基礎(chǔ)上提出了一種基于新型三相四橋臂逆變器的三電平SVPWM控制算法。該算法在計(jì)算矢量作用時間時不需要計(jì)算正余弦函數(shù),只需解四元一次方程組,控制算法相對簡單。且逆變器結(jié)構(gòu)不需要飛跨電容和箝位二極管,隨著電平數(shù)的增加,結(jié)構(gòu)顯得相對簡單,可推廣應(yīng)用到大功率的場合。本文詳細(xì)分析了參考矢量所在的立方體定位以及四面體的判斷,同時計(jì)算了每個基本空間矢量的作用時間。通過仿真表明,文中所提的諧波檢測算法在電源電壓畸變情況下具有很好的實(shí)用性,能夠很好地滿足有源電力濾波器諧波檢測高精度和實(shí)時性的要求�；谛滦湍孀兤鞯娜娖絊VPWM控制算法能準(zhǔn)確地產(chǎn)生與補(bǔ)償電流大小相等、方向相反的電流,投入電網(wǎng)中去治理諧波,補(bǔ)償由于負(fù)載的不平衡產(chǎn)生的中線電流,具有較高的補(bǔ)償精度和較好的動態(tài)響應(yīng)。
[Abstract]:As the most widely used energy in modern society, its power quality is one of the important symbols to measure the development level of a country. With the rapid development of power electronics technology, power electronic equipment has been widely used. With the increasing popularity of office automation and household appliances, a large number of single-phase nonlinear loads appear in three-phase four-wire systems, such as computers, printers, fluorescent lamps, inverter air conditioners, elevators, televisions, washing machines, refrigerators, etc. Although the harmonics generated by a single electrical appliance will not have a great impact on the power grid, because of the extremely large number of using and strong simultaneous operation, a large number of harmonics will have a great impact on the power grid. Aiming at the harmonic problems of three-phase four-wire system such as office and residential buildings, this paper studies the causes of harmonic generation, the significance of harmonic treatment, and the standard of harmonic treatment. The measures of harmonic suppression and the research status and basic working principle of active power filter at home and abroad. Two modules of harmonic current detection algorithm and compensation current tracking control algorithm for shunt active power filter in three-phase four-wire system are studied emphatically. An active power filter model based on a novel three-phase four-arm inverter topology is designed by using MATLAB software. The active power filter model is aimed at the existing qpii? based on linear PI controller three-phase phase-locked loop. The detection speed and accuracy of harmonic current detection algorithm under distorted asymmetric power supply voltage are insufficient. A harmonic current detection algorithm based on variable gain nonlinear PI controller three-phase phase-locked loop is proposed. At the same time, the 2-D space vector pulse width modulation algorithm and diode clamping algorithm for the topology of three-phase three-wire three-arm active power filter are presented. A novel three-level SVPWM control algorithm based on a novel three-phase four-leg inverter is proposed based on the leap capacitance-clamped inverter topology. The algorithm does not need to calculate the sine cosine function when calculating the vector action time, but only needs to solve the quaternion first order equations, and the control algorithm is relatively simple. The structure of the inverter does not need the flying capacitance and clamping diode. With the increase of the level number, the structure is relatively simple, and can be widely used in high-power applications. In this paper, the cube location of reference vector and the judgment of tetrahedron are analyzed in detail, and the action time of each basic space vector is calculated. The simulation results show that the harmonic detection algorithm proposed in this paper has good practicability under the condition of voltage distortion and can meet the requirements of high precision and real time of harmonic detection of active power filter. The three-level SVPWM control algorithm based on the new inverter can accurately generate currents equal to the compensation current in the opposite direction and put into the power network to deal with harmonics and compensate for the neutral-line current caused by the unbalanced load. It has higher compensation precision and better dynamic response.
【學(xué)位授予單位】：西華大學(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：2426979
[Abstract]:As the most widely used energy in modern society, its power quality is one of the important symbols to measure the development level of a country. With the rapid development of power electronics technology, power electronic equipment has been widely used. With the increasing popularity of office automation and household appliances, a large number of single-phase nonlinear loads appear in three-phase four-wire systems, such as computers, printers, fluorescent lamps, inverter air conditioners, elevators, televisions, washing machines, refrigerators, etc. Although the harmonics generated by a single electrical appliance will not have a great impact on the power grid, because of the extremely large number of using and strong simultaneous operation, a large number of harmonics will have a great impact on the power grid. Aiming at the harmonic problems of three-phase four-wire system such as office and residential buildings, this paper studies the causes of harmonic generation, the significance of harmonic treatment, and the standard of harmonic treatment. The measures of harmonic suppression and the research status and basic working principle of active power filter at home and abroad. Two modules of harmonic current detection algorithm and compensation current tracking control algorithm for shunt active power filter in three-phase four-wire system are studied emphatically. An active power filter model based on a novel three-phase four-arm inverter topology is designed by using MATLAB software. The active power filter model is aimed at the existing qpii? based on linear PI controller three-phase phase-locked loop. The detection speed and accuracy of harmonic current detection algorithm under distorted asymmetric power supply voltage are insufficient. A harmonic current detection algorithm based on variable gain nonlinear PI controller three-phase phase-locked loop is proposed. At the same time, the 2-D space vector pulse width modulation algorithm and diode clamping algorithm for the topology of three-phase three-wire three-arm active power filter are presented. A novel three-level SVPWM control algorithm based on a novel three-phase four-leg inverter is proposed based on the leap capacitance-clamped inverter topology. The algorithm does not need to calculate the sine cosine function when calculating the vector action time, but only needs to solve the quaternion first order equations, and the control algorithm is relatively simple. The structure of the inverter does not need the flying capacitance and clamping diode. With the increase of the level number, the structure is relatively simple, and can be widely used in high-power applications. In this paper, the cube location of reference vector and the judgment of tetrahedron are analyzed in detail, and the action time of each basic space vector is calculated. The simulation results show that the harmonic detection algorithm proposed in this paper has good practicability under the condition of voltage distortion and can meet the requirements of high precision and real time of harmonic detection of active power filter. The three-level SVPWM control algorithm based on the new inverter can accurately generate currents equal to the compensation current in the opposite direction and put into the power network to deal with harmonics and compensate for the neutral-line current caused by the unbalanced load. It has higher compensation precision and better dynamic response.
【學(xué)位授予單位】：西華大學(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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