custom home energy storage battery.UPS energy storage power supply harmonic reduction method

　　(A)12 pulse rectifier

　　The principle is to add a phase-shifting transformer and a 6-pulse rectifier on the input side on the basis of the original 6-pulse rectifier. After adopting the technology scheme, the harmonics can be reduced to about 10%. The advantage is relatively simple, the harmonic improvement is obvious; The disadvantage is that the improvement of the power factor is limited and the price is slightly higher.

　　(2) Passive filter

　　According to the principle of LC filter circuit, the harmonics generated by UPS are filtered out and the power factor is compensated. The advantages are simple technology and low cost; The disadvantage is that it can only compensate the harmonics of the point order, and it is greatly affected by the load impedance, which can not be applied to the full power segment.

　　(3) Active filter

　　The principle is to use a controlled power semiconductor device to inject current with the amplitude equal to the harmonic source current and the phase opposite, so that the total harmonic current of the power supply is zero, to achieve the purpose of real-time harmonic current compensation. The advantage is that the harmonics of multiple orders can be compensated, and the load impedance is not affected; The disadvantage is the high acquisition cost.

　　(4) high-frequency IGBT rectification and PFC power factor correction circuit design

　　The rectifier principle is to use high frequency PWM to control IGBT conduction, to segment the input voltage waveform, so that the input current waveform is as close as possible to the sine wave, and to compensate the phase difference between the input voltage and current. The advantages are light volume, cheap price and good effect; The disadvantage is that the technical structure is complex, difficult to maintain, affected by power devices, and the size of the target capacity is limited.

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