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  本文關(guān)鍵詞： 逆變器 開路故障 故障檢測 電壓檢測法 冗余容錯　出處：《電子科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著三相電機驅(qū)動系統(tǒng)在工業(yè)、商業(yè)、軍事、交通、航空航天等領(lǐng)域的廣泛應(yīng)用,提高系統(tǒng)的可靠性就變得尤為重要。三相電機驅(qū)動系統(tǒng)一般由電機、逆變器、傳感器和控制器構(gòu)成,其中逆變器卻是故障高發(fā)區(qū),其可靠性直接關(guān)系到整個驅(qū)動系統(tǒng)的安全和穩(wěn)定。為了提高系統(tǒng)的可靠性,本文針對三相電機驅(qū)動系統(tǒng)中逆變器的故障檢測和容錯控制策略展開了深入研究。首先,本文研究了逆變器開路故障檢測方法,包括專家系統(tǒng)法、電流檢測法和電壓檢測法。針對基于三相電流的誤差電壓法只能檢測單管開路故障的缺點進行了改進,仿真結(jié)果表明:本文改進的電壓檢測法,通過增加一個輔助的檢測變量和簡化輸入量實現(xiàn)了15種開路故障的檢測和定位;然后采用冗余開關(guān)管替換故障管的方法實現(xiàn)了全部27種開路故障的檢測和定位,并消除了部分開路故障存在的不確定性。其次,本文研究了逆變器的容錯控制策略,重點研究了硬件拓撲重構(gòu)與軟件控制策略相結(jié)合的容錯技術(shù)。在深入研究相冗余容錯拓撲的基礎(chǔ)上,通過將相冗余容錯拓撲中第四個橋臂上的兩個開關(guān)管拆開獨立使用,對其進行了改進。仿真結(jié)果表明:本文改進的冗余容錯拓撲,不僅實現(xiàn)了單管開路、單管短路、單相開路、單相短路故障的容錯控制,還能對不同橋臂上的一個上管和一個下管同時發(fā)生開路或短路故障的情況進行容錯。最后,本文設(shè)計了基于dSPACE的硬件在環(huán)實驗平臺,進行了實驗驗證。實驗結(jié)果表明:本文改進的電壓檢測法,大約經(jīng)過一個多電流周期的時間,不僅能夠?qū)崿F(xiàn)全部27種開路故障的實時在線檢測和定位,而且消除了部分開路故障存在的不確定性。而本文改進的冗余容錯拓撲,在保持逆變器輸出功率、控制策略和控制方式不改變的情況下,相對于相冗余容錯拓撲,還能對不同橋臂上的一個上管和一個下管同時發(fā)生開路或短路故障的情況進行容錯。通過及時的故障檢測和容錯控制,提高了系統(tǒng)的可靠性。
[Abstract]:With the wide application of three-phase motor drive system in industrial, commercial, military, transportation, aerospace and other fields, it is particularly important to improve the reliability of the system. The sensor and controller are composed of inverter, which is a high fault area, its reliability is directly related to the safety and stability of the whole drive system, in order to improve the reliability of the system. In this paper, the fault detection and fault-tolerant control strategy of inverter in three-phase motor drive system is deeply studied. Firstly, the open circuit fault detection method of inverter, including expert system method, is studied in this paper. The error voltage method based on three-phase current can only detect the fault of single open circuit fault. The simulation results show that the improved voltage detection method is improved. The detection and location of 15 kinds of open circuit faults are realized by adding an auxiliary detection variable and simplifying the input. Then, the method of replacing fault tube with redundant switch tube is used to detect and locate all 27 kinds of open circuit faults, and the uncertainty of some open circuit faults is eliminated. Secondly. In this paper, the fault-tolerant control strategy of inverter is studied, and the fault-tolerant technology which combines hardware topology reconfiguration with software control strategy is studied, based on the in-depth study of redundant fault-tolerant topology. The two switch tubes on the fourth leg of the redundant fault-tolerant topology are separated and used independently, and the simulation results show that the improved redundant fault-tolerant topology not only realizes the single-tube open circuit. The fault-tolerant control of single-circuit, single-phase open circuit and single-phase short-circuit fault can also be used for fault tolerance of one upper tube and one lower tube on different bridge arms at the same time. The hardware in loop experiment platform based on dSPACE is designed and verified. The experimental results show that the improved voltage detection method in this paper passes through a multi-current cycle time. Not only can all 27 kinds of open circuit faults be detected and located on line in real time, but also the uncertainty of some open circuit faults can be eliminated. The improved redundant fault-tolerant topology in this paper keeps the output power of the inverter. The control strategy and control mode are not changed, relative to the phase redundancy fault-tolerant topology. It can also be used for fault tolerance of open or short circuit faults in one upper tube and one lower tube on different arms. The reliability of the system can be improved by timely fault detection and fault tolerant control.
【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】：TM464

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本文編號：1445328