Synchronized Symmetrical Bus-Clamping PWM Strategies for Three Level Inverter: Applications to Low Switching Frequencies
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Sreenivasappa Bhupasandra Veeranna
The digital control of three-level voltage source inverter fed high power high performance ac drives has recently become a popular in industrial applications. In order to control such drives, the pulse width modulation algorithm needs to be implemented in the controller. In this paper, synchronized symmetrical bus-clamping pulse width modulation strategies are presented. These strategies have some practical advantages such as reduced average switching frequency, easy digital implementation, reduced switching losses and improved output voltage quality compared to conventional space vector pulse width modulation strategies. The operation of three level inverter in linear region is extended to overmodulation region. The performance is analyzed in terms THD and fundamental output voltage waveforms and is compared with conventional space vector PWM strategies and found that switching losses can be minimized using bus-clamping strategy compared to conventional space vector strategy. The proposed method is implemented using Motorola Power PC 8240 processor and verified on a constant v/f induction motor drive fed from IGBT based inverter.
©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston
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Articles in the same Issue
- Article
- An Agent Concept for High Fault Tolerance Wide Area Protection
- Evaluating Performance of Electricity Distribution Centers and Improving Relative Operational Efficiencies through Reorganization: A Case of Nepal
- Analysis of Damping Torque and Synchronizing Torque Contributed by STATCOM Considering Two Different Damping Schemes
- An Efficient Reordering Technique for Incomplete Factorization GMRES Preconditioning: Application in Load Flow Problems
- Mechanical Protection of Induction Motors by Off-the-Shelf Electrical Protective Relays
- Improved State-Variable Internal Model Based Digital Controller for Three-Phase PWM Inverters that Complies with the Standard Iec 62040-3
- Synchronized Symmetrical Bus-Clamping PWM Strategies for Three Level Inverter: Applications to Low Switching Frequencies
