| 引用本文: | 徐先勇,欧朝龙,罗 安,方 璐,方厚辉.新型近似无死区PWM逆变器开关控制方法及其特性分析[J].电力自动化设备,2011,31(8): |
| XU Xianyong,OU Chaolong,LUO An,FANG Lu,FANG Houhui.PWM inverter switching control nearly without dead-time and its characteristic analysis[J].Electric Power Automation Equipment,2011,31(8): |
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| 摘要: |
| 针对逆变器的死区补偿问题，研究了一种无电流传感器近似无死区逆变器开关控制方法。与传统逆变器死区补偿方法相比，该方法只需在逆变器输出电流正负跳变时加入固定的死区脉冲，大幅减少了死区脉冲个数，从而减小死区的影响。为了减小系统成本，采用简单的模拟电路来判别逆变器输出电流正负跳变时刻。深入分析了死区补偿方法的基波和低次谐波特性，指出减小死区时间可削弱死区及低次谐波对逆变器输出电压的影响。仿真及实验结果表明该死区处理方法可适用于单次频率域和谐波域。 |
| 关键词: 死区控制 脉宽调制 逆变器 特性分析 多频率域 谐波分析 控制 |
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| 基金项目:湖南省科技计划项目（2010CK3017，2010FJ3033）；湖南省研究生科研创新项目（CX2010B148） |
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| PWM inverter switching control nearly without dead-time and its characteristic analysis |
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XU Xianyong1, OU Chaolong1, LUO An2, FANG Lu2, FANG Houhui2
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1.Hunan Electric Power Comporation Research Institute，Changsha 410007，China;2.College of Electrical and Information Engineering，Hunan University，Changsha 410082，China
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| Abstract: |
| A PWM converter switching control nearly without dead-time is proposed，which inserts fixed dead-time pulses only when the output current of PWM converter jumps between positive and negative directions. Compared with the traditional dead-time compensation，its dead-time pulses are greatly reduced，which weakens the influence of dead-time. A simple analogue circuit is designed to detect the abrupt change of current direction for cost saving. The characteristics of fundamental and low-order harmonics are analyzed，which shows that the influences of dead-time and low-order harmonics on the output voltage of PWM converter are depressed by reducing the dead-time. Simulative and experimental results indicate that the proposed control method is suitable for single or multiple frequency domains. |
| Key words: dead-time control pulse width modulation electric inverters characteristic analysis multi-frequency domain harmonic analysis control |
