【摘要】：隨著我國煤礦生產(chǎn)技術的不斷發(fā)展和對節(jié)能減排要求的提高,在煤礦供電系統(tǒng)中,各類非線性負載的使用迅速增加。這類負載的運行會產(chǎn)生大量諧波,不僅影響其他用電設備的正常供電,還會對各種通訊系統(tǒng)、保護系統(tǒng)、監(jiān)測系統(tǒng)等造成嚴重的電磁干擾,給煤礦安全生產(chǎn)帶來了很大的隱患。所以采取有效措施抑制煤礦電網(wǎng)系統(tǒng)的諧波污染,已經(jīng)成為煤礦企業(yè)發(fā)展的迫切要求。有源電力濾波器(APF)的補償效果好、響應速度快、適應性廣,是抑制諧波的有效裝置。本文以T型三電平APF為研究對象,著重對三電平滯環(huán)控制進行優(yōu)化。在傳統(tǒng)的三電平滯環(huán)控制過程中,由于各相分別獨立控制而導致功率開關器件存在多余的開關動作。為此,本文在傳統(tǒng)的滯環(huán)控制中加入空間電壓矢量控制,提出了三電平空間矢量滯環(huán)控制策略。相比于傳統(tǒng)的滯環(huán)控制,基于空間矢量滯環(huán)控制可以在更小的開關損耗下達到更好的濾波效果,其工作效率更高。在直流側中點電位平衡控制研究方面,通過實時檢測中點電位的偏向?U_c以及中點電流的i_(NP)流動方向,然后對其進行分析判斷以實時調整不同的開關組合,最終實現(xiàn)其平衡控制。最后基于Matlab仿真平臺以及dSPACE實驗平臺進行實驗驗證。具體內容及成果如下:1)論文闡述了煤礦電網(wǎng)中諧波電流產(chǎn)生的原因及其危害,并回顧了濾波器的發(fā)展歷程,對不同的濾波器進行了分析說明和對比,提出了論文的研究內容。2)闡述說明了T字型三電平APF工作原理、諧波電流的提取方法以及電流的跟蹤技術,提出了T字型三電平APF的技術思路和實現(xiàn)途徑。3)在分析傳統(tǒng)三電平滯環(huán)控制方法及其存在的問題基礎上,提出了在傳統(tǒng)三電平滯環(huán)控制中加入空間電壓矢量控制的控制思路,在此基礎上,構建了空間矢量滯環(huán)控制的仿真模型,模型仿真結果表明了論文提出的控制算法的合理性和有效性。4)對三電平APF直流側中點電位失衡的原因進行了分析,提出通過實時檢測中點電位偏向和中點電流方向進而實時調節(jié)不同的開關組合的方法,在此基礎上,構建了中點電位控制仿真模型,仿真結果表明可以較好的實現(xiàn)中點電位平衡控制。5)論文搭建了基于dSPACE的物理實驗平臺并進行了相應實驗,實驗結果驗證了本文提出的基于空間矢量的滯環(huán)控制策略及中點電位控制方法的正確和有效。
[Abstract]:With the continuous development of coal mine production technology and the improvement of energy saving and emission reduction requirements in coal mine power supply system, the use of all kinds of nonlinear loads is increasing rapidly. The operation of this kind of load will produce a large number of harmonics, which will not only affect the normal power supply of other electric equipments, but also cause serious electromagnetic interference to various communication systems, protection systems and monitoring systems, and bring great hidden trouble to the safety production of coal mines. Therefore, it has become an urgent requirement for the development of coal mining enterprises to take effective measures to restrain harmonic pollution of coal power grid system. Active power filter (APF) is an effective device for harmonic suppression because of its good compensation effect, fast response speed and wide adaptability. This paper focuses on the optimization of three-level hysteresis loop control based on T-type three-level APF. In the traditional three-level hysteresis control process, the power switch device has redundant switching operation due to the independent control of each phase. Therefore, space voltage vector control is added to the traditional hysteresis control, and a three-level space vector hysteresis control strategy is proposed. Compared with the traditional hysteresis control, the hysteresis control based on space vector can achieve better filtering effect at lower switching loss, and its working efficiency is higher. In the research of balance control of midpoint potential on DC side, by detecting the bias of midpoint potential in real time? C and the flow direction of I _ (NP) of midpoint current, and then analyzing and judging it to adjust different switch combinations in real time, Finally, the balance control is realized. Finally, based on Matlab simulation platform and dSPACE experimental platform for experimental verification. The specific contents and achievements are as follows: 1) the paper expounds the cause and harm of harmonic current in coal mine power network, reviews the development course of filter, and analyzes and compares different filters. The research content of this paper is put forward. 2) the principle of T-shaped three-level APF, the method of harmonic current extraction and the current tracking technology are described. This paper puts forward the technical thinking and implementation of T-shaped three-level APF. 3) based on the analysis of the traditional three-level hysteresis control method and its existing problems, In this paper, the control thought of adding space voltage vector control to the traditional three-level hysteresis control is put forward. On this basis, the simulation model of space vector hysteresis control is constructed. The simulation results show that the proposed control algorithm is reasonable and effective. 4) the causes of the imbalance of neutral point potential on the DC side of three-level APF are analyzed. A method of real-time detecting midpoint potential deviation and midpoint current direction and adjusting different switch combinations in real time is proposed. On the basis of this, a simulation model of midpoint potential control is constructed. The simulation results show that the potential balance control at the middle point can be realized well. 5) the physical experiment platform based on dSPACE is built and the corresponding experiments are carried out. The experimental results show that the proposed hysteresis control strategy based on space vector and the midpoint potential control method are correct and effective.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD61

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