三电平ANPC变换器结温均衡调制策略研究
[Abstract]:Three-level diode Neutral Point clamp (Neutral point clamped,NPC) converter has the disadvantage of unbalanced temperature distribution of power device junction. The three-level active neutral point clamp (Active neutral point clamped,ANPC) converter can solve this problem effectively. In this paper, a three-level ANPC converter is studied, including its basic principle, modulation algorithm, loss of power devices and junction temperature equalization. Firstly, the topology and working principle of three-level ANPC converter are analyzed, and three basic pulse width modulation methods (Pulse width modulation,PWM) of three-level ANPC converter are introduced. In order to solve the neutral point potential imbalance problem of three-level ANPC converter, a neutral point potential balance algorithm is designed, which can effectively suppress the neutral point potential offset and fluctuation. The dead-time effect of three-level ANPC converter is analyzed and a dead-time compensation algorithm is designed. This algorithm can effectively solve the problem of voltage output reduction caused by adding dead-time. In order to study the distribution characteristics of power device loss and junction temperature in three-level ANPC converter, the switching process, loss model and thermal network model of IGBT module for insulated gate bipolar transistor (Insulated gate bipolar transistor,IGBT) and power diode are introduced. The loss calculation model of IGBT module is designed. On this basis, the distribution characteristics of loss and junction temperature of three-level ANPC converter under three basic PWM methods are studied, and the relationship between power device loss and commutation mode is deeply analyzed. The modulation strategy of three-level ANPC converter is studied. Three level sine wave pulse width modulation (Sine pulse width modulation,SPWM), space vector pulse width modulation (Space vector pulse width modulation,SVPWM) and special harmonic elimination pulse width modulation (Selected harmonic elimination pulse width modulation,) are introduced. SHEPWM) and the spectral characteristics of the three PWM methods are analyzed. In order to make full use of the advantage of three-level ANPC converter to equalize the junction temperature of power devices, a novel open-loop control SHEPWM modulation strategy for junction temperature feedforward control is proposed and verified by simulation and experiment. The results show that the proposed modulation strategy can effectively equalize the dissipation power and junction temperature distribution of the device and eliminate the specified low order harmonics. Finally, three modulation algorithms, neutral point potential balance control, dead-time compensation and junction temperature equalization modulation strategy, are completed on a three-level ANPC converter experimental platform. The experimental results verify the feasibility and effectiveness of the modulation strategy of the three-level ANPC converter studied in this paper.
【学位授予单位】:中国矿业大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TM46
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