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Study on PWM Converter Control under Unbalanced Network Condition
Fajar Sastrowijoyo,Jaeho Choi(최재호) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
This paper focuses on study on PWM converter control under unbalanced network condition. Voltage unbalance in a three-phase system causes the performance deterioration by producing 120 ㎐ voltage ripples in the DC link and 120 ㎐ ripple in reactive power. To eliminate the ripples, both positive and negative sequence currents should be controlled simultaneously. In this paper four PI controllers on synchronous reference frame is implemented to control D and Q currents in both positive and negative sequence. Positive and negative sequence signal extraction is done using delay signal cancellation method. Simulation results show satisfactory performance in suppressing 120 ㎐ ripples.
Fajar Sastrowijoyo,Novie Ayub Windarko,Jaeho Choi,Gyo-Bum Chung 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.11
This paper describes the control of a utility-connected doublefed induction machine (DFIM) for wind power generation systems (WPGS). Real and reactive powers (PQ) at the stator side of DFIM are strictly controlled to supply the power to the grid without any problems. In this paper the control is realized using Fuzzy PI controller based on the stator-flux orientation control.
Fuzzy Control for Back to Back Converter in DFIG for Wind Power Generation
Fajar Sastrowijoyo,Jaeho Choi,Gyo-Bum Chung 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper describes the control of a utility-connected double-fed induction generator (DFIG) for wind power generation systems (WPGS). Real and reactive powers (PQ) at the stator side of DFIG are strictly controlled to supply the power to the grid without any problems. In addition, DC voltage of the DC link capacitor is also controlled at a certain level with the conventional PI control of the real power, and the power quality at the grid connected to the rotor side of DFIG through the back-to-back converter is maintained in a certain level with a PI control of the reactive power. In this paper, the control is realized using Fuzzy controller based on the stator-flux orientation control. The validity of the proposed algorithm is verified by the comparative study with the conventional PI controller under the balanced and unbalanced grid voltage condition.
Adinda Ihsani Putri,Fajar Sastrowijoyo,Jaeho Choi(최재호) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
The use of boost chopper in Permanent Magnet Synchronous Generator (PMSG) aims to capture maximum power at any wind speed condition. It is reached by adjusting the duty cycle of boost chopper. In this paper, fuzzy logic algorithm is used to find the duty cycle value which yields the maximum power output. This control scheme is verified by PSIM simulation. Another MPPT method is also simulated as a comparison.