An Autonomous Distributed VQC Method based on Q-TBC

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  • Q-TBC (Q Tie-Line Bias Control) 方式による自律分散型電圧・無効電力制御
  • Q TBC Q Tie Line Bias Control ホウシキ ニ ヨル ジリツ ブンサンガタ デンアツ ムコウ デンリョク セイギョ

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Abstract

In order to keep the quality of power and voltage stability, and to minimize transmission losses, a power company maintains the voltage at every point in the power system within the adequate range. Up to now, some automatic Voltage/Reactive power (Q) Control (VQC) methods were proposed. They mostly belong to either local VQC methods, merely based on the information at each substation, or central VQC methods which are based on the information collected at the central dispatching center. Local VQC methods, however, need a cooperative control function to restrain hunting action of transformer taps, a dispersible function to limit the number of actions at some facilities, and so forth. On the other hand, central VQC methods are known to cause control lag when power demand changes suddenly, because of necessity to handle and transmit massive amount of data. They, moreover, need a highly accurate state estimation function.<br> In this paper, we propose a new VQC method, Q-TBC (Reactive Power (Q)Tie-line Bias Control), that is based on the balance of reactive power in the system. The proposed method was developed by the analogy with frequency Tie-line Bias Control. Q-TBC has the advanced characteristics of autonomous and cooperative distributed control. The computer simulation using the practical system data of Kansai Electric Power Co. shows the effectiveness of Q-TBC methods.

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