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| 摘要: |
| 介绍了大容量分布式开关电源的应用现状及存在的谐波问题,设计了阻波器对大容量分布式开关电源零线的谐波进行抑制。阻波器由电容和电感并联,外加由小电阻和双向晶闸管构成的保护电路。对设计的阻波器进行了数值仿真,并应用于某发光二极管(LED)大屏幕的开关电源供电系统。对比阻波器投入前后的电流波形,由1个峰值大且陡的尖脉冲变成了2个平缓的尖脉冲,且电流峰值、3次谐波分量、零线电流都减小,改善了设备运行的工况,保证了继电保护动作的正确性和供电系统的安全稳定运行。 |
| 关键词: 开关电源,阻波器,谐波 |
| DOI： |
| 分类号:TN86 |
| 基金项目: |
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| Harmonic suppression for large-capacity distributed switching power supply |
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XIE Lei ZHANG Yan-chi XIE Da
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| Abstract: |
| The application status of the large-capacity distributed switching power supply and its existing harmonic problem are introduced.A line trap is designed to suppress its zero-line harmonics,which consists of a capacitor and an inductance in parallel,as well as a protective circuit of a small resistor and a bilateral thyristor is added.The designed line trap is simulated and applied to a switching power system for LED(Light Emitting Diode)screens.Current waveforms of the system without and with the line trap are compared.The current wave changes from a high and steep impulse into two mild impulses,and the peak current,the 3rd harmonic current and the zero-line current are all decreased,which improves the operating condition of devices and ensures the proper action of protective relays and the stable operation of the power supply system. |
| Key words: switching power supply,line trap,harmonics |
