發(fā)布時(shí)間：2018-04-09 02:32

  本文選題：有源電力濾波器　切入點(diǎn)：三相四線(xiàn)制NPC型三電平　出處：《電子科技大學(xué)》2014年碩士論文

【摘要】：隨著大量非線(xiàn)性負(fù)載的使用,向電網(wǎng)注入了大量的諧波,三相四線(xiàn)制公用電網(wǎng)的諧波污染問(wèn)題越來(lái)越不可忽視。三相四線(xiàn)制三電平有源電力濾波器(Active Power Filter,APF)具有響應(yīng)速度快、實(shí)時(shí)性高等優(yōu)點(diǎn),能夠有效地補(bǔ)償負(fù)載產(chǎn)生的諧波電流,是理想的電網(wǎng)諧波治理方案。本文以三相四線(xiàn)制中點(diǎn)箝位(Neutral-Point Clamped,NPC)型三電平三橋臂結(jié)構(gòu)為拓?fù)?針對(duì)三相四線(xiàn)制三電平APF的控制算法開(kāi)展了以下幾個(gè)方面的研究:1.對(duì)NPC型三電平三橋臂拓?fù)涞墓ぷ髟磉M(jìn)行分析,以單個(gè)橋臂為例分析NPC型三電平三橋臂APF的各種開(kāi)關(guān)狀態(tài)和中線(xiàn)電流對(duì)直流側(cè)電容電壓的影響,并推導(dǎo)了三相四線(xiàn)制NPC型三電平三橋臂APF的數(shù)學(xué)模型。2.對(duì)APF電流控制策略進(jìn)行了研究。首先分析了基于PI調(diào)節(jié)器的電流控制環(huán)跟蹤補(bǔ)償諧波電流指令能力不足的問(wèn)題。然后,在電流控制環(huán)中引入了重復(fù)控制器,構(gòu)建了以重復(fù)控制器為外環(huán)、PI調(diào)節(jié)器為內(nèi)環(huán)的雙環(huán)電流控制系統(tǒng)。詳細(xì)地給出了重復(fù)控制器的設(shè)計(jì)方法,理論分析了雙環(huán)電流控制系統(tǒng)在穩(wěn)態(tài)方面表現(xiàn)出的優(yōu)越性。3.對(duì)APF直流側(cè)電容的總電壓和電壓差進(jìn)行了分析,設(shè)計(jì)了高效的穩(wěn)壓和均壓控制方法以滿(mǎn)足負(fù)載切換時(shí)直流側(cè)電容電壓的穩(wěn)定。并對(duì)提升直流母線(xiàn)電壓的方法進(jìn)行了分析和研究,設(shè)計(jì)了一種簡(jiǎn)單實(shí)用的直流母線(xiàn)電壓軟啟動(dòng)方法以保證設(shè)備在啟動(dòng)過(guò)程中直流電容電壓可以平穩(wěn)地上升到預(yù)值,且整個(gè)過(guò)程中無(wú)過(guò)壓、過(guò)流現(xiàn)象。4.分析了APF功率損耗與直流母線(xiàn)電壓、APF補(bǔ)償效果與調(diào)制比的關(guān)系。通過(guò)分析得到電網(wǎng)電壓的波動(dòng)和負(fù)載諧波的變化都可以由三相最大調(diào)制比來(lái)反映,提出了一種通過(guò)三相最大調(diào)制比來(lái)計(jì)算直流母線(xiàn)電壓給定值的方法,以達(dá)到APF補(bǔ)償效果和功率損耗的綜合優(yōu)化。
[Abstract]:With the use of a large number of nonlinear loads, a large number of harmonics have been injected into the power network, and the problem of harmonic pollution in the three-phase four-wire public power network can not be ignored more and more.Three-phase four-wire three-level active Power filter (APF) has the advantages of fast response speed and high real-time performance. It can effectively compensate the harmonic current generated by the load.In this paper, the three-level three-level three-level APF with three-phase four-wire neutral-point clamp is used as the topology. The following aspects of the control algorithm of three-phase four-wire three-level APF are studied as follows: 1.The working principle of NPC three-level three-level three-leg topology is analyzed. Taking a single bridge arm as an example, the influence of various switching states and neutral current on DC capacitive voltage of NPC three-level three-level three-level bridge arm is analyzed.The mathematical model of three-level three-level three-level APF with three-phase four-wire NPC is deduced.The current control strategy of APF is studied.Firstly, the problem of current control loop tracking and compensating harmonic current command based on Pi regulator is analyzed.Then, the repetitive controller is introduced into the current control loop, and a double loop current control system with the repetitive controller as the outer loop and Pi regulator as the inner loop is constructed.The design method of repetitive controller is given in detail, and the superiority of double loop current control system in steady state is analyzed theoretically.The total voltage and voltage difference of DC side capacitors of APF are analyzed, and an efficient voltage stabilizing and voltage equalizing control method is designed to meet the voltage stability of DC side capacitors under load switching.The method of raising DC bus voltage is analyzed and studied. A simple and practical soft starting method of DC bus voltage is designed to ensure that the DC capacitor voltage can rise smoothly to the pre-value during the start-up process.And the whole process has no overpressure, overcurrent phenomenon. 4.The relationship between APF power loss and DC bus voltage compensation and modulation ratio is analyzed.It is concluded that the fluctuation of voltage and the variation of load harmonics can be reflected by the maximum modulation ratio of three phases. A method of calculating the given value of DC bus voltage by the maximum modulation ratio of three phase is proposed.In order to achieve the APF compensation effect and power loss optimization.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN713.8;TM761

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本文編號(hào)：1724480