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

【摘要】：隨著大量非線性負載的使用,向電網(wǎng)注入了大量的諧波,三相四線制公用電網(wǎng)的諧波污染問題越來越不可忽視。三相四線制三電平有源電力濾波器(Active Power Filter,APF)具有響應速度快、實時性高等優(yōu)點,能夠有效地補償負載產(chǎn)生的諧波電流,是理想的電網(wǎng)諧波治理方案。本文以三相四線制中點箝位(Neutral-Point Clamped,NPC)型三電平三橋臂結構為拓撲,針對三相四線制三電平APF的控制算法開展了以下幾個方面的研究:1.對NPC型三電平三橋臂拓撲的工作原理進行分析,以單個橋臂為例分析NPC型三電平三橋臂APF的各種開關狀態(tài)和中線電流對直流側電容電壓的影響,并推導了三相四線制NPC型三電平三橋臂APF的數(shù)學模型。2.對APF電流控制策略進行了研究。首先分析了基于PI調節(jié)器的電流控制環(huán)跟蹤補償諧波電流指令能力不足的問題。然后,在電流控制環(huán)中引入了重復控制器,構建了以重復控制器為外環(huán)、PI調節(jié)器為內環(huán)的雙環(huán)電流控制系統(tǒng)。詳細地給出了重復控制器的設計方法,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APF直流側電容的總電壓和電壓差進行了分析,設計了高效的穩(wěn)壓和均壓控制方法以滿足負載切換時直流側電容電壓的穩(wěn)定。并對提升直流母線電壓的方法進行了分析和研究,設計了一種簡單實用的直流母線電壓軟啟動方法以保證設備在啟動過程中直流電容電壓可以平穩(wěn)地上升到預值,且整個過程中無過壓、過流現(xiàn)象。4.分析了APF功率損耗與直流母線電壓、APF補償效果與調制比的關系。通過分析得到電網(wǎng)電壓的波動和負載諧波的變化都可以由三相最大調制比來反映,提出了一種通過三相最大調制比來計算直流母線電壓給定值的方法,以達到APF補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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN713.8;TM761

【參考文獻】

相關期刊論文 前4條

1 武健,徐殿國,何娜;基于優(yōu)化滑動傅立葉分析和廣義積分的并聯(lián)有源濾波器控制策略[J];電網(wǎng)技術;2005年17期

2 熊杰鋒;李群;袁曉冬;陳兵;楊志超;王柏林;;電力系統(tǒng)諧波和間諧波檢測方法綜述[J];電力系統(tǒng)自動化;2013年11期

3 沈玲菲;危韌勇;徐保友;李志勇;;一種新型的有源電力濾波器直接功率控制方法[J];電力系統(tǒng)保護與控制;2013年04期

4 謝斌;戴珂;張樹全;康勇;;并聯(lián)型有源電力濾波器直流側電壓優(yōu)化控制[J];中國電機工程學報;2011年09期

，

本文編號：1724480