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Comparison of performance between bipolar and unipolar double-frequency sinusoidal pulse width modulation in a digitally controlled H-bridge inverter system |
Lei Bo (雷博), Xiao Guo-Chun (肖国春), Wu Xuan-Lü (吴旋律) |
State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China |
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Abstract By deriving the discrete-time models of a digitally controlled H-bridge inverter system modulated by bipolar sinusoidal pulse width modulation (BSPWM) and unipolar double-frequency sinusoidal pulse width modulation (UDFSPWM) respectively, the performances of the two modulation strategies are analyzed in detail. The circuit parameters, used in this paper, are fixed. When the systems, modulated by BSPWM and UDFSPWM, have the same switching frequency, the stability boundaries of the two systems are the same. However, when the equivalent switching frequencies of the two systems are the same, the BSPWM modulated system is more stable than the UDFSPWM modulated system. In addition, a convenient method of establishing the discrete-time model of piecewise smooth system is presented. Finally, the analytical results are confirmed by circuit simulations and experimental measurements.
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Received: 20 October 2012
Revised: 01 November 2012
Accepted manuscript online:
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PACS:
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05.45.-a
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(Nonlinear dynamics and chaos)
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84.30.Jc
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(Power electronics; power supply circuits)
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47.20.Ky
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(Nonlinearity, bifurcation, and symmetry breaking)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51277146), the Foundation of Delta Science, Technology, and the Education Development Program for Power Electronics (Grant No. DREG2011003). |
Corresponding Authors:
Lei Bo
E-mail: leibo@stu.xjtu.edu.cn
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Cite this article:
Lei Bo (雷博), Xiao Guo-Chun (肖国春), Wu Xuan-Lü (吴旋律) Comparison of performance between bipolar and unipolar double-frequency sinusoidal pulse width modulation in a digitally controlled H-bridge inverter system 2013 Chin. Phys. B 22 060509
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