Improved Switching Strategy for Selective Harmonic Elimination in DC-AC Signal Generation via Pulse-Width Modulation
We present an advanced design methodology for pulse-width-modulated (PWM) DC-AC signal generation. Using design methods based on the Walsh transform, AC sinusoidal signals can be approximated by suitable PWM signals. For different AC amplitudes, the switching instants of the PWM signals can be eff...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2013-01-01
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| Series: | Abstract and Applied Analysis |
| Online Access: | http://dx.doi.org/10.1155/2013/870904 |
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| Summary: | We present an advanced design methodology for pulse-width-modulated (PWM) DC-AC signal generation.
Using design methods based on the Walsh transform, AC sinusoidal signals can be approximated by suitable PWM signals.
For different AC amplitudes, the switching instants of the PWM signals can be efficiently computed by using appropriate
systems of explicit linear equations. However, the equation systems provided by conventional implementations of this
approach are typically only valid for a restricted interval of AC amplitudes and, in general, a supervised implementation
of several equation systems is necessary to cover the full AC amplitude range. Additionally, obtaining suitable equation
systems for designs with a large number of switching instants requires solving a complex optimization problem. In defining
the constitutive pulses of a PWM signal, a suitable partition of the time interval is used as a reference system. In the new
methodology, pulses are chosen to be symmetric with respect to the partition points, and the switching times are specified
by means of switching ratios with respect to the endpoint subintervals. This approach leads to particularly simple Walsh
series representations, introduces a remarkable computational simplification, and achieves excellent results in reducing
the harmonic distortion. |
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| ISSN: | 1085-3375 1687-0409 |