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《Transactions of China Electrotechnical Society》 2012-10
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Improvement for the Closed-Loop Control of Shunt Active Power Filter Based on Feedback of Supply-Side Current

Sun Xiaofeng Zeng Jian Li Ningning Li Xin(Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province Yanshan University Qinhuangdao 066004 China)  
The active power filter based on supply-side current detection is better than load current detection in harmonic compensation,while the application is rare because it has worse stability.The system is a closed-loop system because the feedback is supply-side current,including the transfer function producing resonance in the closed-loop.Using proper correction method can suppress the resonance,and the stability margin can be improved by adding phase lead correction to the system.However,after adding phase lead correction to the system,gain of low frequency band is low while increasing the phase margin,limit the improvement of compensation effect.This paper adds selective filter and proportion link to increase gain of specific frequency,which can increase the gain of low frequency band while increasing the phase margin.Its effectiveness is verified by the experiment results.
【Fund】: 国家自然科学基金(50837003);; 河北省自然科学基金(E2012203163)资助项目
【CateGory Index】: TN713.8
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