TCSCによるSSR回避機構の解明

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タイトル別名
  • Clarification of SSR Mitigation Mechanism of TCSC
  • TCSC ニヨル SSR カイヒ キコウ ノ カイメイ

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Thyristor controlled series capacitor (TCSC) is considered to be effective not only for flow control and stabilization of power systems, but also for mitigation of subsynchronous resonance (SSR). This paper clarifies SSR mitigation mechanism of TCSC. First, we show by time simulations that SSR appears and disappears depending on the firing angle of TCSC. Next, we show that its frequency characteristics varies much with the firing angle. Further, we show that SSR occurs in TCSC-compensated systems as well as in conventional series-capacitor-compensated systems when 60Hz minus an electrical resonance frequency of a transmission system coincides with a tortional oscillation frequency of a generator-turbine shaft. TCSC can avert SSR by changing its firing angle and by shifting the electrical resonance frequency. Next, we propose an equivalent circuit of TCSC which consists of a series capacitor in parallel with a resistor and a reactor. We adjust its parameters so that it shows frequency characteristics same as TCSC. We apply it to time simulations to see if it work equivalently as TCSC. Finally, we do eigenvalue analysis with the equivalent circuit. We can get results corresponding to the time simulations.

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