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Current Decoupling Scheme of Three-Phase Inverter with Complex Coefficient Controller
Zheng Xinxin,Xu Jianjun,Shi Jingkui,Huang Wenxin,Li Qiyue 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6
In the control of three-phase system, AC signals are always changed into DC signals by synchronous coordinate transformation. A decoupling control scheme in the dq synchronous reference frame (SRF) is proposed to realize active and reactive current decoupling of three-phase inverter. The complex vector control model is established in SRF. Diff erent from the model established in static reference frame, the SRF control model can refl ect the coupling characteristic of the active and reactive current. As a result, the PI controller with complex coeffi cient can be applied to realize current decoupling. In this paper, the coupling characteristic of three-phase system is analyzed. A novel complex PI controller design method is proposed based on the SRF control model and the coeffi cients are calculated. And its implementation in the control loop is given. Compared with existing PI controllers with real or complex coeffi cients, the proposed complex PI controller can realize completely the decoupling of the active and reactive current in three-phase system. Besides, the control scheme can make current loop fulfi ll the expected symmetrical bandwidth, so as to realize a higher eff ective set-off frequency. As a result, the inverter can achieve well dynamic performance. Finally, the simulation and experimental results are given to verify the theoretical analysis.
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Synchronous PI Decoupling Control Scheme for DVR against a Voltage Sag in the Power System
Kim, Myung-Bok,Lee, Seung-Hoon,Moon, Gun-Woo,Youn, Myung-Joong The Korean Institute of Power Electronics 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.3
This paper proposes a new control strategy for the dynamic voltage restorer (DVR). It is based on a synchronous PI decoupling control strategy which features fast response time and low steady state error. Therefore, the proposed control strategy produces faster action time against voltage sag and guarantees more than enough compensation for reduced supply voltage. Experimental results, implemented with the TMS320C3${\times}$DSP control unit, are shown to validate the effectiveness of the proposed control strategy.
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Synchronous PI decoupling 방법을 사용한 DVR 인버터 최적 제어 기법
김홍규 忠州大學校 2008 한국교통대학교 논문집 Vol.43 No.-
A new control strategy for driving the dynamic voltage restorer (DVR) is proposed. It is based on the synchronous PI decoupling control strategy which features fast response and low steady state error. Therefore, the proposed control strategy takes the faster action against voltage sag and guarantees more enough compensation for the sagged supply voltages. In addition, since the currents flowing through the ripple filter inductor are used as the supplementary control variables, it is possible to protect the switching power device against the surge current in the proposed control strategy. The simulation results and experimental results are shown to validate the effectiveness of the proposed control strategy.
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