By Nicolas Patin
This ebook offers a accomplished assessment of energy digital converters (DC / DC, DC / AC, AC / DC and AC / AC) conventionally utilized in commercial and transportation purposes, particularly for the provision of electrical machines with variable pace drop off window. From the viewpoint of layout and sizing, this ebook offers the various features encountered in a modular approach for strength electronics.
Power Converters and Their Control info much less conventional themes equivalent to matrix converters and multilevel converters. This publication additionally contains a case examine layout of an commercial controller, that is a synthesis (except the AC / AC direct conversion) of the research topics, together with sizing linked passive components.
- Introducing crucial notions in energy electronics from either theoretical and technological perspectives
- Detailed chapters concentrating on energy offers for electric equipment, together with a case learn of complete dimensioning of an commercial variable-speed drive
- Presented from a clients standpoint to assist you to observe the speculation of energy electronics to sensible applications
Read or Download Power Electronics Applied to Industrial Systems and Transports, Volume 2: Power Converters and their Control PDF
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Additional resources for Power Electronics Applied to Industrial Systems and Transports, Volume 2: Power Converters and their Control
3, the modulation strategy has an impact on the amplitude of the pulses. 4 shows the spectrum generated by a bipolar modulation strategy and by a unipolar strategy for a fundamental of the same amplitude at frequency Fm : these graphs were obtained using Fast Fourier Transform (FFT) in a calculation program (Matlab/Simulink) for a power voltage E = 100 V, a switching frequency Fd = 2 kHz and a modulation frequency Fm = 100 Hz. 8, the amplitude of the fundamental at 100 Hz is 80 V. The principle of unipolar modulation involves only modulating the control of one half-bridge at a time.
The vector of these “average” voltages is simply noted v3N . In the same way, we take α3 to be the vector of the duty ratios αa , αb and αc . 31] G The simplest form of modulation consists of applying three sinusoidal duty ratios, with a shift of 120°: ⎧ ⎪ ⎪ ⎨ αa (t) = 1/2. (1 + Km . cos (2πFm t)) αb (t) = 1/2. (1 + Km . cos (2πFm t − 2π/3)) ⎪ ⎪ ⎩ αc (t) = 1/2. (1 + Km . e. Km ≤ 1 for a linear modulation and Km > 1 for overmodulation. 33] C31 The ﬁrst term in this expression is known as the zero sequence component (linked to matrix C31 ); the second term has components with a zero sum, and may be reformulated using a “cos/sin” two phase decomposition.
The machine, therefore, operates as a generator. – This converter allows us to operate a DC motor with a unidirectional torque and two directions of rotation. A typical application of this type of converter is in a crane, where the mechanical load directs operations: the DC motor operates as a motor during lifting, and as a brake during descent. From a control perspective, control inputs (a–b) or (a–c) are applied during lifting (at the scale of a switching period Td ); in descent phases, the controls are of type (d–b) or (d–c).