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The neutral point (NP) potential self-balancing of five-level full bridge inverters with conventional modulation strategy is related to the modulation index. Both the voltages of two split-capacitors should be sampled and controlled, when the inverter operates with the low modulation index. Therefore, an improved modulation strategy is proposed to realize the NP potential self-balancing for five-level...
Dual-buck inverters feature some attractive merits, such as no reverse recovery issues of the body diodes and free of shoot-through. However, since the filter inductors of dual-buck inverters operate at each half cycle of the utility grid alternately, the inductor capacity of dual-buck inverters is twice as much as H-bridge inverters. Thus, the power density of dual-buck converters needs to be improved,...
A T-type three-level inverter topology with RB-IGBT is researched. The operation modes and modulation strategy is analyzed. The power loss of T-type inverter with RB-IGBT and normal IGBT is calculated and compared. Experimental results show that T-type inverter with RB-IGBT has better efficiency than that of normal IGBT.
To satisfy the need of high performance, a grid-connected hybrid cascaded H-bridge single-phase inverter is proposed. The topology of the inverter has different DC voltages, and a modulation method minimizing the switching loss is applied. In order to improve the control performance, the phase lock loop (PLL) based on generalized second-order integrator is adopted. A current controller based on Proportional-Resonant...
We investigate the wavelength-dependent performance of an all-optical multi-logic gate based on XPM. Simulation results show that this scheme is applicable over the whole C-band when the wavelength separation is between 4nm and 33nm
A permanent magnet synchronous motor (PMSM) is applied to drive air-condition compressor in high speed operation for electric vehicle applications. In order to improve the performance, efficiency and reliability of the PMSM-compressor drive, a set of control strategies are developed. A double mode over-modulation method is proposed to enhance the voltage transfer ratio of PWM inverter and the output...
Output voltage error of matrix converter resulted from bi-directional switch commutation is one of the important issues which influence the drive system performance. In this paper, an improved matrix converter fed induction motor vector control drive is presented. The cause and influence of output voltage error due to four-step commutation in matrix converter are discussed deeply. In order to eliminate...
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