Space Vector PWM Voltage Offset Control With Lower Computation
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Solution Overview
Problem
Existing space vector pulse width modulation (SVPWM) techniques face increased computational complexity due to the use of eight vectors, which complicates the generation of switching sequences and requires complex algorithms like KimSul and Switching State Algorithm, leading to longer computation times and higher memory usage.
Innovation Solution
A method that calculates a voltage offset for a reference vector, adds it to each active vector to determine a modified modulated signal, and controls a switching module based on this modified carrier signal, optimizing for reduced computational complexity and total harmonic distortion (THD) by resolving the reference vector for a single active sector and applying the same offset across sectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional SVPWM techniques use eight vectors for generating switching sequences, then the fundamental voltage at inverter output is increased, but the computational complexity increases
Solution Approach 1:
The patent extracts only the necessary active vectors (two per sector) required for SVPWM operation, discarding the need to process all eight vectors. By calculating voltage offsets based on only two active vectors per sector and applying them universally, the method maintains the fundamental voltage benefits of SVPWM while dramatically reducing computational complexity and memory requirements.
2Manufacturing precision
If complex algorithms like KimSul and Switching State Algorithm are used for SVPWM, then the switching sequence generation is accurate, but the computation time increases
Solution Approach 1:
The patent performs preliminary calculation of voltage offsets for active vectors before the main switching sequence generation process. By pre-calculating these offsets based on reference voltage components and applying them directly during PWM generation, the method eliminates the need for complex real-time algorithms like KimSul, significantly reducing computation time while maintaining switching sequence accuracy.
3Adaptability or versatility
If all eight vectors are processed in SVPWM, then complete space vector coverage is achieved, but memory requirements increase
Solution Approach 1:
The patent segments the space vector processing into sectors, requiring voltage offset calculations for only two active vectors per sector rather than all eight vectors. This segmentation approach maintains complete space vector coverage across all sectors while reducing memory requirements by storing and processing only the essential active vector offsets needed for each sector.
Data Source
AI summary
In accordance with at least one aspect of this disclosure, a method for pulse width modulation control includes resolving a reference vector for any number of active space vectors to determine a voltage offset for the reference vector, adding the voltage offset to each active vector to determine a modified modulated signal to be added to a carrier signal, and controlling, with a control module, a switching circuit based at least in part on the modified carrier signal.