By Euzeli dos Santos, Edison R. da Silva
This publication covers strength electronics, intensive, via featuring the fundamental rules and alertness information, which are used either as a textbook and reference book.
• Introduces a brand new strategy to current energy electronics converters referred to as energy Blocks Geometry (PBG)
• Applicable for classes targeting energy electronics, strength electronics converters, and complicated strength converters
• Offers a complete set of simulation effects to aid comprehend the circuits provided during the book
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Additional info for Advanced Power Electronics Converters: PWM Converters Processing AC Voltages
Sample text
Because of this, the line-to-line output voltage waveform of a VSI is equivalent to the line output current waveform of a CSI. Using this knowledge, the CSI can be controlled by the same PWM techniques used to control the VSI. However, practical aspects such as dead-time generation follows different rules for both types of converters. 31 Current source inverter (CSI). 3 ac–dc Conversion Ac–dc converters are also known as rectifiers. Such converters can be sorted as uncontrolled or controlled rectifiers.
The gating signal generation for the power switches can be obtained as done previously by either changing ???? to eliminate specific harmonics components or with a PWM approach, which will push the harmonics to higher frequencies components. 27 Three-phase inverter. 15) are shown in Fig. 28. As the line-to-line voltage in Fig. 28(b) was obtained with ???? = 120∘ , then neither third harmonic nor its multiples are measured in these voltages. This is an important characteristic for three-phase systems, as the natural phase angle displacement among the phases (120∘ ) allows elimination of harmonics.
In Mode 1, switches q1 and q2 conduct the increasing positive load current (t0 < t < t1 ), then q2 is turned off forcing q1 to conduct the load current along with d3 in a free-wheeling mode (Mode 2, t1 < t < t2 ) until q1 is turned off (t2 ). From this moment on, Mode 3 starts with d3 and d4 conducting together; the load voltage becomes negative and the load current is then forced to zero (t2 < t < t3 ). The zero crossing determines the beginning of Mode 4, in which the current increases in the negative direction.