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Hybrid Control System for Managing Voltage and Reactive Power in the JEJU Power System

  • Seo, Sang-Soo ;
  • Choi, Yun-Hyuk ;
  • Kang, Sang-Gyun ;
  • Lee, Byong-Jun ;
  • Shin, Jeong-Hoon ;
  • Kim, Tae-Kyun
  • Published : 2009.12.01

Abstract

This paper proposes a hybrid voltage controller based on a hierarchical control structure for implementation in the Jeju power system. The hybrid voltage controller utilizes the coordination of various reactive power devices such as generators, switched shunt devices and LTC to regulate the pilot voltage of an area or zone. The reactive power source can be classified into two groups based on action characteristics, namely continuous and discrete. The controller, which regulates the pilot bus voltage, reflects these characteristics in the coordination of the two types of reactive power source. However, the continuous type source like generators is a more important source than the discrete type for an emergency state such as a voltage collapse, thereby requiring a more reactive power reserve of the continuous type to be utilized in the coordination in order to regulate the pilot bus voltage. Results show that the hybrid controller, when compared to conventional methods, has a considerable improvement in performance when adopted to control the pilot bus voltage of the Jeju island system.

Keywords

voltage/reactive power control;hybrid control;hierarchical control;optimal control;pilot bus;sensitivity matrix;cost function

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