可変インピーダンス型電力系統の安定化制御手法とその可変直列コンデンサ補償系統への応用

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  • Stabilizing Control Method of Variable Impedance Power Systems and its Application to Variable Series Capacitor
  • カヘン インピーダンスガタ デンリョク ケイトウ ノ アンテイカ セイギョ シ

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In the future electric power systems, it will be very important to utilize the exsting AC networks more effectively with the help of power electronics technology. It has been made it clear that various apparatus utilizing power electronics technologies such as variable series capactor (VSrC) and high speed phase shifter (HSPS) can improve transient stability and damping of one machine and infinite bus power system. This paper presents a novel control scheme for variable impedance apparatus such as VSrC and HSPS in multi-machine power systems. First, this paper describes a comprehensive approach for control design of VSrC and HSPS. The proposed control scheme is based on an energy function of multi-machine power systems. The controllers are designed so that the time derivative of the energy function is smaller in the negative value than that without controllers. In this sense, the present method assures the improvement of first swing stability and damping. Next, the proposed control scheme is applied to VSrC. Digital simulations and eigenvalue analysis are conducted for a three-machine loop system and five-machine radial system to demonstrate the effectiveness of the proposed method. As a result, it is made clear that the proposed controllers for VSrC can improve both transient stability and steady-state stability of power systems significantly.

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