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DSP based control of high power static VAr compensator using novel vector product phase locked loop

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4 Author(s)
Gu H. Jung ; Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Taejon, South Korea ; Guk C. Cho ; Soon W. Hong ; Gyu H. Cho

This paper presents a new dual loop control using novel vector product phase locked loop (VP-PLL) for a high power static VAr compensator (SVC) with three-level GTO voltage source inverter (VSl). Through circuit DQ-transformation method, a simple DQ-axis equivalent circuit is obtained. From this, DC analysis is carried out to obtain maximum controllable phase angle αmax per unit current between the three phase source and the switching function of the inverter, and AC open-loop transfer function is given. Because α max becomes small in high power SVC, this paper proposes VP-PLL for more accurate a control. As a result, the overall control loop has dual loop structure, which consists of inner VP-PLL for synchronizing the phase angle with source and outer Q-loop for compensating reactive power of load. Finally, the validity of the proposed control method is verified through the experimental results

Published in:

Power Electronics Specialists Conference, 1996. PESC '96 Record., 27th Annual IEEE  (Volume:1 )

Date of Conference:

23-27 Jun 1996