永磁同步電動機驅(qū)動系統(tǒng)容錯控制策略研究
發(fā)布時間：2019-01-12 15:59
【摘要】：永磁同步電動機驅(qū)動系統(tǒng)中功率開關器件最容易發(fā)生開關器件開路、短路故障，這些故障會使電機在逆變器不平衡供電下運行，長期這樣會導致整個驅(qū)動系統(tǒng)崩潰。對于高要求的場合，逆變器這些故障更會導致災難性事故發(fā)生。因此，為提高系統(tǒng)可靠性，采用容錯逆變器拓撲實現(xiàn)故障后系統(tǒng)重構及容錯控制就顯得十分必要。本論文針對逆變器開路、短路故障，選擇成本低性能好的三相四開關逆變器容錯拓撲，，并研究了基于空間矢量脈寬調(diào)制(SVPWM)技術的直接轉矩控制策略。最終通過仿真分析實現(xiàn)永磁同步電機容錯三相四開關系統(tǒng)的SVPWM直接轉矩控制。主要工作有以下幾方面如下： 首先，本文介紹了幾種永磁同步電動機系統(tǒng)高性能控制方式，討論了永磁同步電機驅(qū)動系統(tǒng)常見故障，并提出了有效的容錯策略，最后考慮經(jīng)濟性和高效性，本文選取永磁同步電動機驅(qū)動系統(tǒng)三相四開關容錯拓撲直接轉矩控制展開研究。 其次，建立永磁同步電動機的數(shù)學模型，提出新的磁鏈觀測方法并對容錯控制策略的實現(xiàn)進行理論分析，包括電壓空間矢量的定義、磁鏈和轉矩的滯環(huán)控制和開關表的定義。在分析三相六開關逆變器驅(qū)動系統(tǒng)直接轉矩控制方法基礎上，重新定義電壓空間矢量和開關表，實現(xiàn)三相四開關逆變器驅(qū)動系統(tǒng)的直接轉矩控制。 再者，引入SVPWM技術到傳統(tǒng)直接轉矩控制。在分析三相六開關系統(tǒng)SVPWM技術的控制算法的基礎上，重新設計參考空間電壓矢量的合成方法、扇區(qū)判斷以及開關作用時間和導通時刻，得到三相四開關系統(tǒng)SVPWM技術的控制算法。 最后，將容錯控制理論進行仿真驗證，將永磁同步電動機三相六開關系統(tǒng)的SVPWM直接轉矩控制和三相四開關系統(tǒng)的SVPWM直接轉矩控制搭建在一個模型中，這樣可以更直觀的分析容錯前后運行性能，仿真結果表明，三相四開關容錯拓撲結構在永磁同步電動機上具有良好的可行性和運行性能。
[Abstract]:In the drive system of permanent magnet synchronous motor (PMSM), power switch devices are most prone to open circuit and short circuit faults, which will cause the motor to run under the unbalanced power supply of the inverter, which will lead to the collapse of the whole drive system for a long time. For high requirements, inverter failures will lead to catastrophic accidents. Therefore, in order to improve the system reliability, it is necessary to use fault-tolerant inverter topology to realize system reconfiguration and fault-tolerant control. In this paper, the fault tolerant topology of three-phase four-switch inverter with low cost and good performance is selected for the open circuit and short-circuit fault of the inverter, and the direct torque control strategy based on space-vector pulse width modulation (SVPWM) technology is studied. Finally, SVPWM direct torque control of fault tolerant three-phase four-switch system of PMSM is realized by simulation analysis. The main work is as follows: firstly, this paper introduces several high performance control methods of PMSM system, discusses the common faults of PMSM drive system, and puts forward effective fault-tolerant strategies. Finally, considering the economy and high efficiency, this paper studies the three-phase four-switch fault-tolerant direct torque control (DTC) for the PMSM drive system. Secondly, the mathematical model of permanent magnet synchronous motor (PMSM) is established, and a new flux observation method is proposed, and the realization of fault-tolerant control strategy is analyzed theoretically, including the definition of voltage space vector, hysteresis control of flux chain and torque and the definition of switch table. On the basis of analyzing the direct torque control method of three-phase six-switch inverter drive system, the voltage space vector and switching table are redefined to realize the direct torque control of three-phase four-switch inverter drive system. Furthermore, SVPWM technology is introduced into the traditional direct torque control. On the basis of analyzing the control algorithm of SVPWM technology in three-phase six-switch system, this paper redesigns the synthesis method of reference space voltage vector, sector judgment, switching time and on-on time, and obtains the control algorithm of three-phase four-switch system SVPWM technology. Finally, the fault-tolerant control theory is simulated, and the SVPWM direct torque control of the three-phase six-switch system of permanent magnet synchronous motor and the SVPWM direct torque control of the three-phase four-switch system are built in a model. The simulation results show that the three-phase four-switch fault-tolerant topology has good feasibility and performance in PMSM.
【學位授予單位】：集美大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM341
本文編號：2407957
[Abstract]:In the drive system of permanent magnet synchronous motor (PMSM), power switch devices are most prone to open circuit and short circuit faults, which will cause the motor to run under the unbalanced power supply of the inverter, which will lead to the collapse of the whole drive system for a long time. For high requirements, inverter failures will lead to catastrophic accidents. Therefore, in order to improve the system reliability, it is necessary to use fault-tolerant inverter topology to realize system reconfiguration and fault-tolerant control. In this paper, the fault tolerant topology of three-phase four-switch inverter with low cost and good performance is selected for the open circuit and short-circuit fault of the inverter, and the direct torque control strategy based on space-vector pulse width modulation (SVPWM) technology is studied. Finally, SVPWM direct torque control of fault tolerant three-phase four-switch system of PMSM is realized by simulation analysis. The main work is as follows: firstly, this paper introduces several high performance control methods of PMSM system, discusses the common faults of PMSM drive system, and puts forward effective fault-tolerant strategies. Finally, considering the economy and high efficiency, this paper studies the three-phase four-switch fault-tolerant direct torque control (DTC) for the PMSM drive system. Secondly, the mathematical model of permanent magnet synchronous motor (PMSM) is established, and a new flux observation method is proposed, and the realization of fault-tolerant control strategy is analyzed theoretically, including the definition of voltage space vector, hysteresis control of flux chain and torque and the definition of switch table. On the basis of analyzing the direct torque control method of three-phase six-switch inverter drive system, the voltage space vector and switching table are redefined to realize the direct torque control of three-phase four-switch inverter drive system. Furthermore, SVPWM technology is introduced into the traditional direct torque control. On the basis of analyzing the control algorithm of SVPWM technology in three-phase six-switch system, this paper redesigns the synthesis method of reference space voltage vector, sector judgment, switching time and on-on time, and obtains the control algorithm of three-phase four-switch system SVPWM technology. Finally, the fault-tolerant control theory is simulated, and the SVPWM direct torque control of the three-phase six-switch system of permanent magnet synchronous motor and the SVPWM direct torque control of the three-phase four-switch system are built in a model. The simulation results show that the three-phase four-switch fault-tolerant topology has good feasibility and performance in PMSM.
【學位授予單位】：集美大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM341
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