voltage vector การใช้

• Study on three - level inverter using space voltage vector pwm method
• The system of dtc with regulation of - 120 voltage vectors
• Study of dsp based three - phase pwm rectifier controlled by space voltage vector
• Novel dead - time compensation strategy for space voltage vector pwm inverter
• A new algorithm for the zone decision of reference voltage vector of three - level inverter
• The first one is based on keeping the input current vector in phase with the input voltage vector
• In this thesis , a voltage vector control inverter based on dsp is studied and developed
• Only one space voltage vector is applied in each sampling period in the implementation of the conventional pmsm dtc system
• The duty expressions of mc have been derived by the method of separate modulation and then combination of input current vector and output voltage vector
• The paper presents a direct torque ' s compound control technique , which means to select different voltage vector varying from speed , working on constant torque area when the induction motor is fed by three - level inverter
• Therefore , the transform of two operations is smooth and easy . on the other hand , the application of the space voltage vector can realize the maximum utilization of the bus dc voltage of the inverter
• In sum , both of these two algorithms are realized through selecting proper voltage vector . in addition , the performance criterion are respectively described , and the torque ripple under low - speed is analyzed and compared in this paper
• On the detailed analysis of pmsm dtc principle , the function of zero voltage vector and the choice method of voltage vector in ev driving are proposed . restricted condition about stator flux linkage under dtc is analyzed
• The zero - voltage vector , whose function is to keep the output torque unchanged , is applied to a switching table to minish the ripple of the torque and improve the performance of the steady characteristic of the system
• The key of the implementation of the full digital speed - sensorless vwf system lies in how to obtain the speed calculation modek voltage vector decoupling modek speed adjuster model and how to obtain the pwm switch signal
• To further improve the performance , a space vector modulation ( svm ) method is proposed in this thesis to offer the desired space voltage vector for accurate control of the torque and the stator flux linkage
• Each unit of transformer is tested in accordance with the following items : winding d . c resistance test . measurement of turn ratio and calibiation of voltage vector relation . measurement of impedance voltage and load loss
• Aiming at present problems , the author also studied the hysteresis control system based on voltage vector control and its corresponding scheme . in chapter one , the harmonic problems and the development of active power factor filter are discussed