单相功率因数整流器的理论研究

Theoretical study on single phase power factor rectifier

摘要:

针对电网中存在的谐波会导致功率因数降低和电流波形发生畸变等问题,详细阐述了一种最适合小功率范围内的有源功率因数校正方法。并根据相关原理,结合Boost变换器设计了一种单相高功率因数整流器。结果表明：经过校正后的输出电流产生的谐波数量明显降低,输出电流的波形近似为正弦波。同时,通过调节电感和电容的参数取值,使电流波纹稳定在了9.667%,输入电压抖动范围稳定在了6.8%左右,使得功率因数获得很大的提高,有效的降低了输入电流的谐波,并抑制了系统中的电磁干扰,保证了系统的正常稳定工作,达到了预期设定的目标。因此,抑制整流电路的谐波,提高功率因数是提高电网供电质量的有效途径。

Abstract:

Aiming at the problems of harmonic reduction in power factor and distortion of current waveform in the power grid, an active power factor correction method which is most suitable for small power range is discussed in detail. According to the principle of correlation and Boost converter, a single-phase high power factor rectifier is designed. The results show that the harmonics produced by the corrected output current are obviously reduced, and the waveform of the output current is approximately being more sinusoidal. By adjusting the parameters of inductance and capacitance simultaneously, the current ripple is stable at 9.667%, the input voltage range of jitter is stable at around 6.8%.The power factor is greatly improved, the harmonic of input current is reduced effectively, and the electromagnetic interference is suppressed in the system, ensuring the goal for optimally normal working of the system. Therefore, restraining the harmonic of rectifier circuit and increasing the power factor is an effective method to improve the quality of power supply.