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In HVDC systems, power converters are well known the generators of harmonics on both ac and dc side. Because of the interaction between ac and dc systems, some kinds of disturbances in the ac or dc side may cause the fundamental or second harmonic current on the dc side. When the dc loop of the HVDC system has natural resonant frequencies on the fundamental or the second harmonic frequencies, the...
The thyristor controlled series capacitor (TCSC) is subsynchronous resonance (SSR) neutral in itself. But in a hybrid system which includes both conventional fixed series compensation and TCSC, disturbances may still excite torsional modes. This paper aims to design a supplementary damping controller for the hybrid system to mitigate the SSR. The method and procedure for the syntheses of the controller...
Static Var Compensator (SVC) is a kind of FACTS device which is used in power system primarily for the purpose of voltage and reactive power control. Based on wide area signals, this paper presents a systematic approach for designing SVC supplementary controller, which is used to improve the damping of power system oscillation. The principle for damping oscillation by SVC is first analyzed and the...
In this paper, the effects of different types of excitation systems and PSS on the SSR damping characteristics are studied. The complex torque coefficient approach realized by time domain simulation - the test signal method is adopted. The studied system consists of a single-machine infinite bus system. Three types of excitation systems - IEEE AC1A, AC2A, ST1A excitation systems are selected as examples...
SVC is a kind of FACTS device which is used in power system primarily for the purpose of voltage and reactive power control. Based on wide area signal, this paper presented a systematic approach for design of SVC supplementary control which is used to improve damping of power system oscillation. The principle of SVC damping oscillation is first analyzed and the concept of synthetic residue index is...
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