【摘要】：采用矢量控制的異步電機傳動系統(tǒng)憑借與直流電機相媲美的優(yōu)良控制性能而廣泛應(yīng)用于各個工業(yè)領(lǐng)域,包括一些可靠性要求較高的場合。然而,由于惡劣工作環(huán)境或者人員誤操作等原因,系統(tǒng)部件可能會發(fā)生故障,其中,最易受到外界影響的部件是傳感器,而在異步電機的矢量控制系統(tǒng)中,必須對電流和轉(zhuǎn)速進(jìn)行閉環(huán)控制,一旦電流傳感器或速度傳感器發(fā)生故障就會造成反饋信息的不準(zhǔn)確甚至缺失,這將會嚴(yán)重地影響整個系統(tǒng)的控制性能,甚至導(dǎo)致系統(tǒng)崩潰,造成巨大的經(jīng)濟損失和人員傷亡。因此,針對電流傳感器和速度傳感器故障的容錯控制就顯得尤為重要。本文針對電流傳感器故障提出了一種更加簡單的容錯控制方法,針對速度傳感器的故障提出了一種可靠性更高的容錯控制方法。首先給出了異步電機在兩相靜止坐標(biāo)下的系數(shù)學(xué)模型,然后介紹了本文采用的電流傳感器故障容錯控制方法以及所用到的電流估計器,接著又在兩相靜止坐標(biāo)系下分別介紹了擴展卡爾曼濾波器轉(zhuǎn)速估計算法、擴展卡龍貝格估計器轉(zhuǎn)速估計算法以及本文所采用的速度傳感器故障容錯控制方法。最后,在MATLAB/Simulink中搭建了電流傳感器和速度傳感器故障容錯控制的仿真模型,仿真結(jié)果證明了本文所提方案的正確性和有效性。為了驗證本文所提出的傳感器故障容錯控制方案的可行性,搭建了 1.5kW的實驗樣機平臺,在以TMS320F28335DSP為控制核心的實驗平臺上進(jìn)行了容錯控制實驗研究,實驗結(jié)果表明本文所提出的容錯控制方案在傳感器故障的情況下依然可以保證系統(tǒng)繼續(xù)安全運行,證明了本文所提方案的可行性。
[Abstract]:Vector-controlled induction motor drive system is widely used in various industrial fields because of its excellent control performance comparable to that of DC motor, including some occasions with high reliability requirements. However, due to the harsh working environment or misoperation of personnel, system components may fail, among which, the most vulnerable to outside world. In vector control system of asynchronous motor, current and speed must be closed-loop controlled. Once the current sensor or speed sensor fails, the feedback information will be inaccurate or even missing. This will seriously affect the control performance of the whole system, and even lead to system collapse. This paper presents a simpler fault-tolerant control method for current sensor faults and a more reliable fault-tolerant control method for speed sensor faults. The coefficient model of asynchronous motor in two-phase stationary coordinates is presented. Then the fault-tolerant control method of current sensor and the current estimator used in this paper are introduced. Then the speed estimation algorithm of extended Kalman filter and the speed estimation of extended Caromberg estimator are introduced in two-phase stationary coordinates. Finally, the fault-tolerant control simulation model of current sensor and speed sensor is built in MATLAB/Simulink. The simulation results prove the correctness and validity of the proposed scheme. The feasibility of the scheme is studied. A 1.5kW prototype platform is built and the fault-tolerant control experiment is carried out on the experimental platform with the control core of TMS320F28335 DSP. The experimental results show that the fault-tolerant control scheme proposed in this paper can ensure the system to continue to operate safely even if the sensor is faulty. It proves that the scheme proposed in this paper can ensure the system to run safely. Feasibility.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM343

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