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Design Considerations for Maintaining DC-Side Voltage of Hybrid Active Power Filter With Injection Circuit

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5 Author(s)
An Luo ; Coll. of Electr. & Inf. Eng., Hunan Univ., Changsha ; Zhikang Shuai ; Shen, Z.J. ; Wenji Zhu
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Hybrid active power filter with injection circuit (IHAPF) shows great promise in reducing harmonics and improving power factor with a relatively low capacity active power filter, but suffers from DC-side voltage instability that inadvertently impacts the compensation performance and safety of the IHAPF. In this paper, two new methods are proposed to overcome this major technical challenge with a hysteretic control and energy release circuit, and a controllable pulsewidth modulation (PWM) rectifier. Modeling, theoretical analysis, and experimental results have verified that both methods can stabilize DC-side voltage within a certain range. A prototype IHAPF system was built incorporating the PWM rectifier DC voltage control scheme, and installed in a 220 kV substation in Southern China. It demonstrated significant improvement in harmonics reduction and power factor. The DC voltage stability issue was also resolved with the new design.

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Power Electronics, IEEE Transactions on  (Volume:24 ,  Issue: 1 )