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Xuewei Pan,Peng Wang,Quoc Nam Trinh,Akshay Kumar Rathore 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
A small signal analysis and a closed loop control design of naturally commutated current-fed threephase isolated dc/dc converter are presented in this paper. State-space averaging technique is used to derive the small signal model. Based on the derived small signal model, a closed two-loop controller is designed and implemented on mixed signal (analog and digital) processor Cypress PSoC 5. A complete design procedure is presented. Simulation results using PSIM 9.0.4 and experimental waveforms from a 750W prototype with the designed controller are illustrated to verify the stability of the control system. Experimental results for step changes in load clearly show satisfactory transient performance of the converter and validate closed two-loop design.
Quoc Nam Trinh,Peng Wang,Fok Hoong Choo,Chi Jin,XueWei Pan,Hong Hee Lee 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper proposes a novel control strategy for smooth transition between stand-alone and gridconnected modes of distributed generation (DG). The proposed control scheme is designed in stationary (α-β) reference frame consisted of outer grid current control loop using a proportional resonant (PR) controller and the inner load voltage control loop developed with a repetitive controller (RC). The proposed control strategy is able to produce a sinusoidal load voltage in stand-alone mode and a sinusoidal grid current in grid-connected operation of the DG despite the presence of nonlinear local load. One unified control scheme is developed for both stand-alone and gridconnected operations so that the DG does not need to change control scheme and voltage or current spikes can be effectively prevented during transition period. Since the control system is developed in the α-β reference frame, coordinate transformations are not required, which can significantly reduce the complexity and improve the accuracy of the DG control system. The feasibility of the proposed method is validated through selected simulated and experimental results.