Space vector PWM
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Space Vector Pulse Width Modulation and implementation in Arduino.
![3/25/2014
2
• Early 1960’s Kirnnich, Heinrick and Bowes first developed PWM [1]
• 1964 Carrier based techniques developed first, followed by SPWM by
Schonung and Stemmler [2]
• Not until mid-1980’s was SVPWM introduced [3]
Introduction and history](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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- 2. 3/25/2014 2 • Early 1960’s Kirnnich, Heinrick and Bowes first developed PWM [1] • 1964 Carrier based techniques developed first, followed by SPWM by Schonung and Stemmler [2] • Not until mid-1980’s was SVPWM introduced [3] Introduction and history
- 3. 3/25/2014 3 • 3 phase variables are expressed in space vectors • Space Vectors • Main objective: approximation of reference voltage vector utilizing eight switching patterns [5] • Each desired voltage vector can be simulated by an averaging effect between two adjacent active vectors and a zero vector. • 3 phase inverter Briefing
- 4. 3/25/2014 4 • Higher DC bus efficiency • Voltage magnitude control • Low power losses • Variable frequency control • Other advantages are a wide linear modulation range, low switching loss, ease of implementation, and reduce computational complexity due to fewer sin functions • advantages under unbalanced motor operation conditions Benefits
- 5. 3/25/2014 5 • SVPWM maximum peak fundamental magnitude of 90.6% of inverter capacity is 15.5% over SPWM [6] • 1991, Holtz proposed over-modulation based SVPWM, further improving the DC bus voltage usage to the levels of six step waves [7] [8]. Benefits elaboration
- 6. 3/25/2014 6 • Often used to supply 3-phase AC voltage from DC source to drive machines • Modulation strategy plays an important role in the minimization of harmonics and the switching losses Use
- 7. 3/25/2014 7 • Six of the eight states result in voltage applied to the generator windings with two states resulting in zero voltage as seen in the figure below • Control the torque output of the generator, we need to create a smoothly rotating vector at any angle Intuitive Approach
- 8. 3/25/2014 8 • By switching between two adjacent vectors quickly, the generator will see an average vector in-between • Filter between the inverter and the generator will filter out the high frequency effect caused by the switching Intuitive Approach Cont.
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- 19. Benefit of SVPWM – Lower switching loss Mosfets switch 6 times ~ output switch 1 time. Mosfets switch 6 times ~ output switch 2 time. If we have to output a same frequency, Mosfets in SVPWM scheme have to switch ½ less than normal SPWM.
- 20. Full Scale Converter for Synchronous Wind Turbine Generators Thank you!