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This paper investigates the analytical models of Conduction and Switching Losses (CASLs) of the three-phase ac-dc matrix rectifier. An analytical model of CASLs is obtained through the examination of operating principles for three-phase ac-dc matrix rectifier. The effectiveness of the models has been experimentally verified.
This paper presents the application of reduced form of general direct space vector modulation(G-SVM) approach of ac-ac matrix converter theory to three-phase ac-dc matrix rectifier. The reduced form of G-SVM and the derivation of three-phase ac-dc matrix rectifier from three-phase ac-ac matrix converter are described and theoretically justified. A prominent feature of the reduced G-SVM controlled...
This paper proposes a new sensorless direct torque and flux controlled interior permanent magnet synchronous machine drive fed by a matrix converter. Closed-loop control of both torque and stator flux is achieved by using two PI controllers. The input power factor and output voltage vector are regulated with the indirect space vector modulation. An adaptive observer is used for joint stator flux and...
This paper investigates the modulation and control of a new bidirectional converter for 42V ISA system. The modulation for both rectifier and inverter is derived from the indirect space vector modulation algorithm for AC/AC matrix converter. The proposed bidirectional AC/DC power converter combines the advantages of matrix converter and Z-source inverter. The closed-loop control of input displacement...
A new sensorless direct torque control scheme for matrix converter-fed interior permanent magnet synchronous machine is investigated in this paper. Comparing to the classical DTC, the proposed scheme features in low ripples in torque and flux, fixed switching frequency and unity input power factor. Moreover, it significantly reduces the harmonics in the input current even with a small input filter...
This paper proposes a sensorless direct torque and flux control system using indirect space vector modulation for matrix converter driven IPM synchronous machine, operating over a wide speed range including standstill. The adaptive flux observer is enhanced by introducing correction terms in the adaptive model. The first correction is derived from the error signal of high-frequency signal injection...
This paper presents a sensorless hysteresis direct torque control method using matrix converter fed IPM synchronous motor. This method allows a reduction of the harmonic content of the input current without any negative effect on the drive performance. The merits of the original HDTC scheme, simplicity, robustness and high dynamics, are preserved. Moreover, by applying two input vectors at each cycle,...
This paper presents a speed and position estimation method for the sensorless direct torque and flux control scheme for matrix converter driven interior permanent-magnet synchronous motor. The adaptive sliding mode observer simultaneously estimates the stator flux, speed and rotor position. A permanent magnet flux estimator is integrated with the observer to compensate the effect of inaccurate PM...
This paper proposes a sensorless direct torque and flux control system using indirect space vector modulation for matrix converter driven IPM synchronous machine, operating over a wide speed range including standstill. A novel stator flux observer is enhanced by introducing a correction term in the adaptive model, derived from the d-axis current estimation error at high and medium speeds and from...
This paper presents a novel sensorless direct torque controlled IPM synchronous machine fed by a matrix converter. The input power factor is controlled by applying two active switching combinations in each control cycle. The FFT spectrum analysis shows the better input quality without any negative effect on the output as compared with the classical HDTC. A torque ripple minimization strategy is used...
This paper proposes a method of over-voltage protection using power Zener diode for ac-ac matrix converter, ac-dc matrix converter, and matrix-Z-source converter. The analysis and design consideration have been explained, and the discussion on both advantage and drawback of this method also has been given. The effectiveness of this method has been experimentally verified.
This paper presents a modified direct torque control scheme for matrix converter drives. This method allows a reduction of the harmonic content of the input current without any negative effect on the drive performance and its simplicity. By using two switching configurations at each cycle, the synthesis of the input current vector is more accurate than the previous method at the same sampling period,...
This paper presents an improved direct torque control (DTC) method for sensorless matrix converter drives using a multi-mode indirect space vector modulation (ISVM) and an adaptive sliding mode observer. The drive system is characterized by reduced torque and flux ripples, unity input power factor, sinusoidal input/output waveforms and good sensorless control performance over a wide speed range, while...
An improved direct torque control (DTC) scheme for the matrix converter fed Interior Permanent Magnet Synchronous Machine (IPMSM) is presented in this paper. In the proposed scheme, the modified DTC strategy for matrix converter IPMSM drives is achieved using a variable-structure torque and stator flux controller, and indirect space vector modulation (ISVM) technique. It features low torque and flux...
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