永磁同步電機直接轉(zhuǎn)矩控制系統(tǒng)的容錯運行研究.pdf

1、The dissertation is divided into 7 chapters, which is organized as follows.Chapter 1 is the introduction, where the high performance control scheme of PMSM, direct torque control of PM Motor, inverter fault diagnosis s

2、chemes,fault-tolerant operation of PMSM D'TC System and enhanced high performance operation of fault-tolerant PMSM drive system are all discussed and analyzed through literature review. And the dissertation is finally ou

3、tlined. Chapter 2 presents the basic theory of direct torque control strategy and its implementation on the permanent magnet synchronous motors, explained and verified by experiment study. Some inverter faults are an

4、alyzed and simulated successively. Chapter 3 has reviewed some inverter faults diagnosis schemes presented in the literature firstly and the Adaptive Neural-Fuzzy System (ANFIS) method is discussed with the measured

5、current as the only signal directly adopted for fault diagnosis. The single inverter fault, such as open-switch, short-switch, open-phase and short-phase faults can be effectively, directly detected and diagnosed by the

6、proposed intelligent approach ANFIS. Chapter 4 reviews different inverter fault-tolerant topologies that had been proposed in the literature and finally the Switch-Redundant topology is considered as the most

7、 appropriate fault-tolerant topology to be applied in PMSM DTC. Also, the operation principle of the potential fault-tolerant PMSM DTC is investigated in detail and verified successfully by both simulation and experiment

8、. Chapter 5 discusses the operation performance and some problems associated with the post faulted PMSM DTC system supplied by a Four-Switch Three-Phase Inverter (FSTPI), such as relatively large ripples in electroma

9、gnetic torque and stator flux linkage. Detailed simulation and experimental test verify that with the proposed fault-tolerant scheme, the PMSM DTC drive system is able to maintainits stable steady state operation with a

10、slightly degraded performance. Chapter 6 introduces some high performance operation techniques to enhance the performance of the PMSM DTC fed by FSTPI, such as Perpendicular Flux Observer, Space Voltage Modulation (S

11、VM) and Sliding Mode Control (SMC). Among them, the SMC is the most important measure of high performance operation for a FSTPI fed PMSM DTC system. Furthermore, some improvements on the SVM and the SMC tech