Abstract
This paper presents a detailed analysis results of the effect of a thyristor-controlled series capacitor (TCSC) on subsynchronous resonance (SSR), which was first applied to a Korean power system. First, the TCSC parameters were calculated, the structure of TCSC with synchronous voltage reversal (SVR) controller was presented, and the torsional characteristics of Hanul nuclear power generator rotor were studied to investigate the natural frequency and mode shape. The test signal method was used to determine the electrical damping in the frequency range of SSR operation through an electromagnetic transient analysis program in various system configurations. The SSR phenomenon was analyzed by comparing the electrical and mechanical damping of a conventional fixed series capacitor (FSC), and the case of a TCSC installed, and the effectiveness of the TCSC without any risk of SSR was demonstrated. As a result, when installing FSC, SSR occurred under sensitive operating conditions, but SSR was prevented in the case of TCSC compensation with SVR. The results obtained in this study can be effectively applied to the installation of TCSC in real power systems.
Highlights
Nowadays, electric power transmission lines are under the stress of reaching the thermal limit due to the increase of the transmission power
A number of studies have been conducted so far on subsynchronous resonance (SSR) mitigation using thyristor controlled series capacitor (TCSC) [3,4,5,6,7], the authors in Ref. [8] introduced that TCSC is attractive to SSR mitigation
It has been mentioned that, when a generator is a radial connection with series compensation such as the fixed series capacitor (FSC) and TCSC, the generator is the worst case to the excitation of the SSR at one or more shaft modes
Summary
Electric power transmission lines are under the stress of reaching the thermal limit due to the increase of the transmission power. Is well known as an effective solution to improve the power transfer capability. One of the FACTS devices, the thyristor controlled series capacitor (TCSC) improves power transfer capability and helps mitigate the subsynchronous resonance (SSR) problem [1]. The mitigation of the SSR effect into power system become an important issue. A number of studies have been conducted so far on SSR mitigation using TCSC [3,4,5,6,7], the authors in Ref. [8] introduced that TCSC is attractive to SSR mitigation. The influence of control methodology on SSR was introduced in [9]. The first IEEE benchmark model had three control methods, consisting of constant impedance, constant current and constant power control
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