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This paper describes the closed loop space vector modulation strategy for Active Front End Converter (AFC). Low value of Power factor and excessive harmonic content are major disadvantages of conventional converter. To alleviate this problem, Carrier-Based-Sinusoidal Pulse Width Modulation (CB-SPWM) can be implemented in PWM converter; Narrow range of linear operation of converter is limitation of...
The paper presents performance analysis and optimization of digital pulse width modulation (PWM) techniques for surface-mounted permanent magnet synchronous motors (SPMSM). Three specific PWM techniques such as sinusoidal PWM (SPWM), space vector PWM (SVPWM), and hysteresis PWM (HPWM) are designed and implemented for three-phase voltage source inverter-fed SPMSM drive. Each of the PWM technique is...
The conventional voltage source inverter is only a buck converter and conventional current source inverter is only a boost converter. By adding a Z-Source network, the buck-boost capability can be achieved. The recently proposed Quasi-Z-Source inverter (qZSI) is an important improvement to Z-Source inverter (ZSI), which greatly reduces the passive component stress. The current-fed qZSI can buck-boost...
The auxiliary converter (AXC) has been presented as a cost-effective solution to retrofit the conventional diode rectifier into a unity power factor and regeneration-enabled front end. The transistor-based AXC operates as an active filter when the load system consumes power. When the load system regenerates, the AXC can transfer the energy back to the ac grid. However, the pulse width modulation (PWM)...
The mathematical and simulation model of three-phase voltage source rectifier (VSR) used in aircraft is introduced in this paper. Based on the model, the principle of the seven-segment space vector pulse-with modulation (SVPWM) control strategy is presented. The double closed-loop control method is applied in the PWM rectifier. The rectifier can realize unity power factor by adopting the fixed switching...
Three phase three level neutral point clamped (NPC) rectifier is a popular topology for power converter front-ends to achieve controllable DC voltage. In this paper, its mathematical model is analyzed and a dual-loop control strategy is adopted to regulate both DC voltage and input power factor. Instead of space vector PWM, an improved multi-level carrier based PWM is presented. The control system...
The auxiliary converter (AXC) has been presented as a cost-effective solution to retrofit the conventional diode rectifier into a unity-power-factor and regeneration-enabled front-end. However, the pulse width modulation (PWM) switching of the AXC often causes circulating current between the AXC and diode rectifier. The zero vectors of each PWM cycle induce zero sequence current, which results in...
Numerical simulation methodology based on high frequency mathematical model of high power factor PWM rectifier is proposed in this paper. And input to output transform function is deduced. With the help of input to output transform function, the design method of voltage regulator has been presented. The simulation for three-phase PWM rectifier is implemented with Runge-Kutta, thus comprehensive simulation...
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