Variable switching frequency PWM for three-phase converter for loss and EMI improvement

Compared with the widely used constant switching frequency PWM method, variable switching frequency PWM can benefit more because of the extra freedom. Based on the analytical expression of current ripple of three-phase converter discussed in “Study of Analytical Current Ripple of Three-Phase PWM Converter” in APEC 2012, variable switching frequency PWM (VSFPWM) methods are proposed to satisfy different ripple requirements. Two methods are discussed in this paper. The first method (VSFPWM1) is designed to arrange the current ripple peak value within a certain value, and can reduce the equivalent switching frequency and EMI noise; the second method (VSFPWM2) is designed to keep ripple current RMS value constant and reduce the EMI noise. Simulation and experimental results show that variable switching frequency control could improve the performance.

[1]  Ahmet M. Hava,et al.  Carrier-based PWM-VSI overmodulation strategies: analysis, comparison, and design , 1998 .

[2]  Ahmet M. Hava,et al.  Simple Analytical and Graphical Methods for Carrier-Based PWM-VSI Drives , 1999 .

[3]  V. Blasko,et al.  Analysis of a hybrid PWM based on modified space vector and triangle comparison methods , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[4]  A. Trzynadlowski,et al.  Space vector PWM technique with minimum switching losses and a variable pulse rate , 1993, Proceedings of IECON '93 - 19th Annual Conference of IEEE Industrial Electronics.

[5]  K. Borisov,et al.  A novel random PWM technique with low computational overhead and constant sampling frequency for high-volume, low-cost applications , 2005, IEEE Transactions on Power Electronics.

[6]  Joachim Holtz,et al.  Optimal pulsewidth modulation for AC servos and low-cost industrial drives , 1992, Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting.

[7]  Zhao Zhengming,et al.  A Single-Stage Three-Phase Grid-Connected Photovoltaic System With Modified MPPT Method and Reactive Power Compensation , 2007, IEEE Transactions on Energy Conversion.

[8]  G. Narayanan,et al.  Control of Three-Phase, Four-Wire PWM Rectifier , 2008, IEEE Transactions on Power Electronics.

[9]  Zhaoming Qian,et al.  A Robust Control Scheme for Grid-Connected Voltage-Source Inverters , 2011, IEEE Transactions on Industrial Electronics.

[10]  Zhe Chen,et al.  A Review of the State of the Art of Power Electronics for Wind Turbines , 2009, IEEE Transactions on Power Electronics.

[11]  Andrzej M. Trzynadlowski,et al.  Space vector PWM technique with minimum switching losses and a variable pulse rate [for VSI] , 1997, IEEE Trans. Ind. Electron..

[12]  Dushan Boroyevich,et al.  Review of high-performance three-phase power-factor correction circuits , 1997, IEEE Trans. Ind. Electron..

[13]  T. G. Habetler,et al.  Power electronic converter and system control , 2001 .

[14]  D. Boroyevich,et al.  A Systematic Topology Evaluation Methodology for High-Density Three-Phase PWM AC-AC Converters , 2008, IEEE Transactions on Power Electronics.

[15]  Di Zhang,et al.  Improved Asymmetric Space Vector Modulation for Voltage Source Converters with Low Carrier Ratio , 2012, IEEE Transactions on Power Electronics.

[16]  R L Kirlin,et al.  Shaping the Noise Spectrum in Power Electronic Converters , 2011, IEEE Transactions on Industrial Electronics.

[17]  Mariusz Malinowski,et al.  A comparative study of control techniques for PWM rectifiers in AC adjustable speed drives , 2003 .

[18]  Zhiqiang Wang,et al.  Comparative investigation of PWM techniques for a new drive for electric vehicles , 2003 .

[19]  Drazen Dujic,et al.  Switching Ripple Characteristics of Space Vector PWM Schemes for Five-Phase Two-Level Voltage Source Inverters—Part 2: Current Ripple , 2011, IEEE Transactions on Industrial Electronics.

[20]  Y. Sozer,et al.  Modeling and Control of Utility Interactive Inverters , 2009, IEEE Transactions on Power Electronics.

[21]  R. Ayyanar,et al.  Optimal Variable Switching Frequency Scheme for Reducing Switching Loss in Single-Phase Inverters Based on Time-Domain Ripple Analysis , 2009, IEEE Transactions on Power Electronics.

[22]  Danwei Wang,et al.  Relationship between space-vector modulation and three-phase carrier-based PWM: a comprehensive analysis [three-phase inverters] , 2002, IEEE Trans. Ind. Electron..

[23]  Drazen Dujic,et al.  Switching Ripple Characteristics of Space Vector PWM Schemes for Five-Phase Two-Level Voltage Source Inverters—Part 1: Flux Harmonic Distortion Factors , 2011, IEEE Transactions on Industrial Electronics.

[24]  Rajapandian Ayyanar,et al.  Space-Vector-Based Hybrid Pulsewidth Modulation Techniques for Reduced Harmonic Distortion and Switching Loss , 2010, IEEE Transactions on Power Electronics.