本文選題：雙三電平逆變器 + 容錯(cuò)控制��； 參考：《中國礦業(yè)大學(xué)》2016年碩士論文

【摘要】：電機(jī)調(diào)速系統(tǒng)在礦井提升機(jī)、電動(dòng)汽車等行業(yè)具有廣泛的應(yīng)用,其可靠性直接關(guān)系到整個(gè)系統(tǒng)的安全運(yùn)行。但調(diào)速系統(tǒng)中的變流器及其驅(qū)動(dòng)電路較容易發(fā)生故障,其可靠性問題始終無法有效解決。雙三電平逆變器具有輸出電壓等級(jí)高,輸出電平數(shù)較多,以及容錯(cuò)能力強(qiáng)等優(yōu)點(diǎn),本文以雙三電平逆變器拓?fù)錇檠芯繉?duì)象,對(duì)其容錯(cuò)控制、中點(diǎn)電位平衡、死區(qū)補(bǔ)償、共模電壓抑制、矢量控制等方面內(nèi)容進(jìn)行了深入研究。本文分析雙三電平逆變器拓?fù)鋼Q流情況,根據(jù)開關(guān)器件的不同導(dǎo)通關(guān)斷組合歸納出五種不同的輸出狀態(tài);求解空間電壓矢量表達(dá)式,繪出空間電壓矢量圖;探討死區(qū)效應(yīng)和死區(qū)補(bǔ)償,給出時(shí)間補(bǔ)償和電壓補(bǔ)償兩種具體補(bǔ)償方法;分析開繞組電機(jī)數(shù)學(xué)模型及矢量控制原理,給出矢量控制基本框圖。針對(duì)任意開關(guān)器件開路,本文采用一種線電壓坐標(biāo)系容錯(cuò)算法,該算法使用不產(chǎn)生零序電壓和共模電壓的零共模電壓矢量,通過調(diào)整平衡因子實(shí)現(xiàn)中點(diǎn)電位平衡,由于故障時(shí)開關(guān)器件導(dǎo)通順序不具備正常運(yùn)行時(shí)的對(duì)稱性,本文改變故障時(shí)開關(guān)器件導(dǎo)通規(guī)則,使之滿足容錯(cuò)運(yùn)行要求。針對(duì)任意橋臂故障,本文采用一種雙三電平逆變器共母線容錯(cuò)拓?fù)?在開繞組電機(jī)各繞組與直流側(cè)中點(diǎn)之間連接6個(gè)雙向晶閘管,當(dāng)逆變器任意一個(gè)橋臂短路或開路故障時(shí),切除該橋臂,利用60°坐標(biāo)系容錯(cuò)算法使系統(tǒng)容錯(cuò)運(yùn)行。上述故障時(shí),雙三電平逆變器最大輸出電壓下降為正常運(yùn)行時(shí)一半。通過仿真對(duì)線電壓坐標(biāo)系容錯(cuò)算法和60°坐標(biāo)系容錯(cuò)算法進(jìn)行驗(yàn)證,仿真結(jié)果證明了容錯(cuò)算法和死區(qū)補(bǔ)償方法的正確性。針對(duì)雙三電平逆變器獨(dú)立母線拓?fù)?改進(jìn)任意一側(cè)逆變器故障容錯(cuò)拓?fù)?使系統(tǒng)從正常運(yùn)行迅速切換至容錯(cuò)運(yùn)行。將雙向晶閘管引入獨(dú)立母線拓?fù)?使任意雙橋臂故障時(shí)系統(tǒng)仍能降額運(yùn)行,與單純切除一側(cè)逆變器的方法相比,本方法可實(shí)現(xiàn)兩逆變器同時(shí)故障時(shí)的容錯(cuò)運(yùn)行,擴(kuò)大了容錯(cuò)范圍。雙三電平逆變器獨(dú)立母線容錯(cuò)拓?fù)渫瑯舆m用單橋臂故障,此時(shí),容錯(cuò)時(shí)額定轉(zhuǎn)速達(dá)到原額定轉(zhuǎn)速的3/4,可應(yīng)用于對(duì)轉(zhuǎn)速要求較高的場(chǎng)合。基于雙三電平逆變器拓?fù)鋵?shí)驗(yàn)平臺(tái)對(duì)本文所提容錯(cuò)控制策略進(jìn)行了實(shí)驗(yàn)驗(yàn)證。證明了容錯(cuò)控制策略、中點(diǎn)電位平衡、矢量控制、死區(qū)補(bǔ)償方法、零共模電壓抑制方法的有效性,具有較好的容錯(cuò)效果。
[Abstract]:Motor speed regulation system is widely used in mine hoist, electric vehicle and so on. Its reliability is directly related to the safe operation of the whole system. However, the converter and its drive circuit in the speed control system are prone to malfunction, and the reliability problem can not be solved effectively. Dual-three-level inverter has the advantages of high output voltage level, high output level number, and strong fault tolerance. In this paper, the double three-level inverter topology is taken as the research object, fault tolerant control, neutral-point potential balance, dead-time compensation, etc. The common mode voltage suppression and vector control are studied in detail. In this paper, the topology commutation of dual-three-level inverter is analyzed, five different output states are concluded according to the different on-off combination of switching devices, the expression of space voltage vector is solved, and the space voltage vector diagram is drawn. This paper discusses the dead-time effect and dead-time compensation, gives two specific compensation methods, time compensation and voltage compensation, analyzes the mathematical model and vector control principle of open-winding motor, and gives the basic block diagram of vector control. In this paper, a fault tolerant algorithm of linear voltage coordinate system is used for open circuit of arbitrary switching devices. This algorithm uses zero common-mode voltage vector without generating zero-sequence voltage and common-mode voltage, and realizes neutral-point potential balance by adjusting the balance factor. Due to the fact that the switch on sequence does not have the symmetry in normal operation, the switch on rule is changed in this paper to meet the requirements of fault-tolerant operation. In this paper, a common-bus fault tolerant topology of a two-level three-level inverter is used to connect six bi-directional thyristors between the winding of the open winding motor and the neutral point of the DC side. When any one of the legs of the inverter is short circuit or open circuit fault, The arm is excised and the fault tolerant algorithm of 60 擄coordinate system is used to make the system run fault-tolerant. In the above faults, the maximum output voltage of the double three level inverter is reduced to half of the normal operation. The fault-tolerant algorithm of linear voltage coordinate system and the fault-tolerant algorithm of 60 擄coordinate system are verified by simulation. The simulation results show that the fault-tolerant algorithm and dead-time compensation method are correct. Aiming at the independent bus topology of the two-three-level inverter, the fault tolerant topology of any side inverter is improved so that the system can be switched from normal operation to fault-tolerant operation quickly. The bi-directional thyristor is introduced into the independent bus topology, so that the system can still operate under any double bridge arm fault. Compared with the method of simply removing one side inverter, this method can realize the fault-tolerant operation of two inverters at the same time. The fault tolerance range has been expanded. The fault-tolerant topology of dual three-level inverter is also suitable for single bridge arm fault. In this case, the rated speed of fault tolerance reaches 3 / 4 of the original rated speed, which can be applied to the situation with high speed requirement. The fault-tolerant control strategy proposed in this paper is experimentally verified based on the topology experiment platform of a two-level three-level inverter. It is proved that the fault-tolerant control strategy, midpoint potential balance, vector control, dead-time compensation and zero-common-mode voltage suppression are effective.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM464

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