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Development of a hybrid margin angle controller for HVDC continuous operation

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7 Author(s)
Sato, M. ; Kansai Electr. Power Co. Inc., Osaka, Japan ; Yamaji, K. ; Sekita, M. ; Amano, M.
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The objective of this paper is to present a new hybrid margin angle control method for HVDC continuous operation under AC system fault conditions. For stable continuous operation of HVDC systems, the margin angle controller must be designed to maintain the necessary margin angle to avoid commutation failures. The proposed method uses the open loop margin angle controller (MAC) as the basic controller, and adds output from the closed loop MAC to correct the control angle. A fast voltage detection algorithm is used for open loop control, and margin angle reference correction using harmonics detection for closed loop control are also developed. The combination of open and closed loop control provides quick responses when faults occur with stable and speedy recovery after fault clearance. The effectiveness of the developed controller is confirmed through EMTP digital simulations and also with the experiments using an analogue simulator

Published in:

Power Systems, IEEE Transactions on  (Volume:11 ,  Issue: 4 )

Date of Publication:

Nov 1996

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